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authordon bright <hugh.m.bright@gmail.com>2013-01-24 03:01:34 (GMT)
committerdon bright <hugh.m.bright@gmail.com>2013-01-24 03:01:34 (GMT)
commit1bec7aad09631d3f86874ead2c26335bc897fde5 (patch)
tree018b0ecc4d199c955be6553e56a306d1411ab728
parente82b056e811f7a72e7fb94ecbc1683420831b05e (diff)
modify qmake buildfile, move offscreen rendering to main src directory
Diffstat
-rw-r--r--openscad.pro23
-rw-r--r--tests/OffscreenContext.h13
-rw-r--r--tests/OffscreenContext.mm146
-rw-r--r--tests/OffscreenContextGLX.cc328
-rw-r--r--tests/OffscreenContextWGL.cc247
-rw-r--r--tests/OffscreenView.cc170
-rw-r--r--tests/OffscreenView.h45
-rw-r--r--tests/fbo.cc237
-rw-r--r--tests/fbo.h25
-rw-r--r--tests/imageutils-lodepng.cc24
-rw-r--r--tests/imageutils-macosx.cc64
-rw-r--r--tests/imageutils.cc16
-rw-r--r--tests/imageutils.h9
-rw-r--r--tests/lodepng.cpp5797
-rw-r--r--tests/lodepng.h1899
15 files changed, 22 insertions, 9021 deletions
diff --git a/openscad.pro b/openscad.pro
index b11f45b..1edf97c 100644
--- a/openscad.pro
+++ b/openscad.pro
@@ -229,7 +229,13 @@ HEADERS += src/version_check.h \
src/linalg.h \
src/system-gl.h \
src/stl-utils.h \
- src/svg.h
+ src/svg.h \
+ \
+ src/lodepng.h \
+ src/OffscreenContext.h \
+ src/OffscreenView.h \
+ src/fbo.h \
+ src/imageutils.h
SOURCES += src/version_check.cc \
src/ProgressWidget.cc \
@@ -287,10 +293,25 @@ SOURCES += src/version_check.cc \
src/dxftess-cgal.cc \
src/CSGTermEvaluator.cc \
src/svg.cc \
+ src/OffscreenView.cc \
+ src/fbo.cc \
\
src/openscad.cc \
src/mainwin.cc
+unix:!macx {
+ SOURCES += src/OffscreenContextGLX.cc
+ SOURCES += src/imageutils-lodepng.cc
+}
+macx {
+ SOURCES += src/OffscreenContext.mm
+ SOURCES += src/imageutils-macosx.cc
+}
+win32* {
+ SOURCES += src/OffscreenContextWGL.cc
+ SOURCES += src/imageutils-lodepng.cc
+}
+
opencsg {
HEADERS += src/OpenCSGRenderer.h
SOURCES += src/OpenCSGRenderer.cc
diff --git a/tests/OffscreenContext.h b/tests/OffscreenContext.h
deleted file mode 100644
index 6eebcba..0000000
--- a/tests/OffscreenContext.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef OFFSCREENCONTEXT_H_
-#define OFFSCREENCONTEXT_H_
-
-#include <iostream> // for error output
-#include <string>
-
-struct OffscreenContext *create_offscreen_context(int w, int h);
-void bind_offscreen_context(OffscreenContext *ctx);
-bool teardown_offscreen_context(OffscreenContext *ctx);
-bool save_framebuffer(OffscreenContext *ctx, const char *filename);
-std::string offscreen_context_getinfo(OffscreenContext *ctx);
-
-#endif
diff --git a/tests/OffscreenContext.mm b/tests/OffscreenContext.mm
deleted file mode 100644
index a0995fa..0000000
--- a/tests/OffscreenContext.mm
+++ /dev/null
@@ -1,146 +0,0 @@
-#include "OffscreenContext.h"
-#include "imageutils.h"
-#include "fbo.h"
-#include <iostream>
-#include <sstream>
-
-#import <AppKit/AppKit.h> // for NSOpenGL...
-#include <CoreServices/CoreServices.h>
-#include <sys/utsname.h>
-
-#define REPORTGLERROR(task) { GLenum tGLErr = glGetError(); if (tGLErr != GL_NO_ERROR) { std::cout << "OpenGL error " << tGLErr << " while " << task << "\n"; } }
-
-struct OffscreenContext
-{
- NSOpenGLContext *openGLContext;
- NSAutoreleasePool *pool;
- int width;
- int height;
- fbo_t *fbo;
-};
-
-std::string offscreen_context_getinfo(OffscreenContext *ctx)
-{
- std::stringstream out;
-
- struct utsname name;
- uname(&name);
-
- SInt32 majorVersion,minorVersion,bugFixVersion;
-
- Gestalt(gestaltSystemVersionMajor, &majorVersion);
- Gestalt(gestaltSystemVersionMinor, &minorVersion);
- Gestalt(gestaltSystemVersionBugFix, &bugFixVersion);
-
- const char *arch = "unknown";
- if (sizeof(int*) == 4) arch = "32-bit";
- else if (sizeof(int*) == 8) arch = "64-bit";
-
- out << "GL context creator: Cocoa / CGL\n"
- << "PNG generator: Core Foundation\n"
- << "OS info: Mac OS X " << majorVersion << "." << minorVersion << "." << bugFixVersion << " (" << name.machine << " kernel)\n"
- << "Machine: " << arch << "\n";
- return out.str();
-}
-
-OffscreenContext *create_offscreen_context(int w, int h)
-{
- OffscreenContext *ctx = new OffscreenContext;
- ctx->width = w;
- ctx->height = h;
-
- ctx->pool = [NSAutoreleasePool new];
-
- // Create an OpenGL context just so that OpenGL calls will work.
- // Will not be used for actual rendering.
-
- NSOpenGLPixelFormatAttribute attributes[] = {
- NSOpenGLPFAPixelBuffer,
- NSOpenGLPFANoRecovery,
- NSOpenGLPFADepthSize, 24,
- NSOpenGLPFAStencilSize, 8,
-// Took out the acceleration requirement to be able to run the tests
-// in a non-accelerated VM.
-// NSOpenGLPFAAccelerated,
- (NSOpenGLPixelFormatAttribute) 0
- };
- NSOpenGLPixelFormat *pixFormat = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];
-
- // Create and make current the OpenGL context to render with (with color and depth buffers)
- ctx->openGLContext = [[NSOpenGLContext alloc] initWithFormat:pixFormat shareContext:nil];
- if (!ctx->openGLContext) {
- std::cerr << "Unable to create NSOpenGLContext\n";
- return NULL;
- }
-
- [ctx->openGLContext makeCurrentContext];
-
- // glewInit must come after Context creation and before FBO calls.
- GLenum err = glewInit();
- if (GLEW_OK != err) {
- std::cerr << "Unable to init GLEW: " << glewGetErrorString(err) << std::endl;
- return NULL;
- }
- glew_dump();
-
- ctx->fbo = fbo_new();
- if (!fbo_init(ctx->fbo, w, h)) {
- return NULL;
- }
-
- return ctx;
-}
-
-bool teardown_offscreen_context(OffscreenContext *ctx)
-{
- fbo_unbind(ctx->fbo);
- fbo_delete(ctx->fbo);
-
- /*
- * Cleanup
- */
- [ctx->openGLContext clearDrawable];
- [ctx->openGLContext release];
-
- [ctx->pool release];
- return true;
-}
-
-/*!
- Capture framebuffer from OpenGL and write it to the given filename as PNG.
-*/
-bool save_framebuffer(OffscreenContext *ctx, const char *filename)
-{
- if (!ctx || !filename) return false;
- // Read pixels from OpenGL
- int samplesPerPixel = 4; // R, G, B and A
- int rowBytes = samplesPerPixel * ctx->width;
- unsigned char *bufferData = (unsigned char *)malloc(rowBytes * ctx->height);
- if (!bufferData) {
- std::cerr << "Unable to allocate buffer for image extraction.";
- return 1;
- }
- glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE,
- bufferData);
- REPORTGLERROR("reading pixels from framebuffer");
-
- // Flip it vertically - images read from OpenGL buffers are upside-down
- unsigned char *flippedBuffer = (unsigned char *)malloc(rowBytes * ctx->height);
- if (!flippedBuffer) {
- std::cout << "Unable to allocate flipped buffer for corrected image.";
- return 1;
- }
- flip_image(bufferData, flippedBuffer, samplesPerPixel, ctx->width, ctx->height);
-
- bool writeok = write_png(filename, flippedBuffer, ctx->width, ctx->height);
-
- free(flippedBuffer);
- free(bufferData);
-
- return writeok;
-}
-
-void bind_offscreen_context(OffscreenContext *ctx)
-{
- fbo_bind(ctx->fbo);
-}
diff --git a/tests/OffscreenContextGLX.cc b/tests/OffscreenContextGLX.cc
deleted file mode 100644
index e607593..0000000
--- a/tests/OffscreenContextGLX.cc
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
-
-Create an OpenGL context without creating an OpenGL Window. for Linux.
-
-See Also
-
- glxgears.c by Brian Paul from mesa-demos (mesa3d.org)
- http://cgit.freedesktop.org/mesa/demos/tree/src/xdemos?id=mesa-demos-8.0.1
- http://www.opengl.org/sdk/docs/man/xhtml/glXIntro.xml
- http://www.mesa3d.org/brianp/sig97/offscrn.htm
- http://glprogramming.com/blue/ch07.html
- OffscreenContext.mm (Mac OSX version)
-
-*/
-
-/*
- * Some portions of the code below are:
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-#include "OffscreenContext.h"
-#include "printutils.h"
-#include "imageutils.h"
-#include "system-gl.h"
-#include "fbo.h"
-
-#include <GL/gl.h>
-#include <GL/glx.h>
-
-#include <assert.h>
-#include <sstream>
-
-#include <sys/utsname.h> // for uname
-
-using namespace std;
-
-struct OffscreenContext
-{
- GLXContext openGLContext;
- Display *xdisplay;
- Window xwindow;
- int width;
- int height;
- fbo_t *fbo;
-};
-
-void offscreen_context_init(OffscreenContext &ctx, int width, int height)
-{
- ctx.width = width;
- ctx.height = height;
- ctx.openGLContext = NULL;
- ctx.xdisplay = NULL;
- ctx.xwindow = (Window)NULL;
- ctx.fbo = NULL;
-}
-
-string get_os_info()
-{
- struct utsname u;
- stringstream out;
-
- if (uname(&u) < 0)
- out << "OS info: unknown, uname() error\n";
- else {
- out << "OS info: "
- << u.sysname << " "
- << u.release << " "
- << u.version << "\n";
- out << "Machine: " << u.machine;
- }
- return out.str();
-}
-
-string offscreen_context_getinfo(OffscreenContext *ctx)
-{
- assert(ctx);
-
- if (!ctx->xdisplay)
- return string("No GL Context initialized. No information to report\n");
-
- int major, minor;
- glXQueryVersion(ctx->xdisplay, &major, &minor);
-
- stringstream out;
- out << "GL context creator: GLX\n"
- << "PNG generator: lodepng\n"
- << "GLX version: " << major << "." << minor << "\n"
- << get_os_info();
-
- return out.str();
-}
-
-static XErrorHandler original_xlib_handler = (XErrorHandler) NULL;
-static bool XCreateWindow_failed = false;
-static int XCreateWindow_error(Display *dpy, XErrorEvent *event)
-{
- cerr << "XCreateWindow failed: XID: " << event->resourceid
- << " request: " << (int)event->request_code
- << " minor: " << (int)event->minor_code << "\n";
- char description[1024];
- XGetErrorText( dpy, event->error_code, description, 1023 );
- cerr << " error message: " << description << "\n";
- XCreateWindow_failed = true;
- return 0;
-}
-
-bool create_glx_dummy_window(OffscreenContext &ctx)
-{
- /*
- create a dummy X window without showing it. (without 'mapping' it)
- and save information to the ctx.
-
- This purposely does not use glxCreateWindow, to avoid crashes,
- "failed to create drawable" errors, and Mesa "WARNING: Application calling
- GLX 1.3 function when GLX 1.3 is not supported! This is an application bug!"
-
- This function will alter ctx.openGLContext and ctx.xwindow if successfull
- */
-
- int attributes[] = {
- GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT, //support all 3, for OpenCSG
- GLX_RENDER_TYPE, GLX_RGBA_BIT,
- GLX_RED_SIZE, 8,
- GLX_GREEN_SIZE, 8,
- GLX_BLUE_SIZE, 8,
- GLX_ALPHA_SIZE, 8,
- GLX_DEPTH_SIZE, 24, // depth-stencil for OpenCSG
- GLX_STENCIL_SIZE, 8,
- GLX_DOUBLEBUFFER, True,
- None
- };
-
- Display *dpy = ctx.xdisplay;
-
- int num_returned = 0;
- GLXFBConfig *fbconfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy), attributes, &num_returned );
- if ( fbconfigs == NULL ) {
- cerr << "glXChooseFBConfig failed\n";
- return false;
- }
-
- XVisualInfo *visinfo = glXGetVisualFromFBConfig( dpy, fbconfigs[0] );
- if ( visinfo == NULL ) {
- cerr << "glXGetVisualFromFBConfig failed\n";
- XFree( fbconfigs );
- return false;
- }
-
- // can't depend on xWin==NULL at failure. use a custom Xlib error handler instead.
- original_xlib_handler = XSetErrorHandler( XCreateWindow_error );
-
- Window root = DefaultRootWindow( dpy );
- XSetWindowAttributes xwin_attr;
- int width = ctx.width;
- int height = ctx.height;
- xwin_attr.background_pixmap = None;
- xwin_attr.background_pixel = 0;
- xwin_attr.border_pixel = 0;
- xwin_attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
- xwin_attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
- unsigned long int mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
-
- Window xWin = XCreateWindow( dpy, root, 0, 0, width, height,
- 0, visinfo->depth, InputOutput,
- visinfo->visual, mask, &xwin_attr );
-
- // Window xWin = XCreateSimpleWindow( dpy, DefaultRootWindow(dpy), 0,0,42,42, 0,0,0 );
-
- XSync( dpy, false );
- if ( XCreateWindow_failed ) {
- XFree( visinfo );
- XFree( fbconfigs );
- return false;
- }
- XSetErrorHandler( original_xlib_handler );
-
- // Most programs would call XMapWindow here. But we don't, to keep the window hidden
- // XMapWindow( dpy, xWin );
-
- GLXContext context = glXCreateNewContext( dpy, fbconfigs[0], GLX_RGBA_TYPE, NULL, True );
- if ( context == NULL ) {
- cerr << "glXCreateNewContext failed\n";
- XDestroyWindow( dpy, xWin );
- XFree( visinfo );
- XFree( fbconfigs );
- return false;
- }
-
- //GLXWindow glxWin = glXCreateWindow( dpy, fbconfigs[0], xWin, NULL );
-
- if (!glXMakeContextCurrent( dpy, xWin, xWin, context )) {
- //if (!glXMakeContextCurrent( dpy, glxWin, glxWin, context )) {
- cerr << "glXMakeContextCurrent failed\n";
- glXDestroyContext( dpy, context );
- XDestroyWindow( dpy, xWin );
- XFree( visinfo );
- XFree( fbconfigs );
- return false;
- }
-
- ctx.openGLContext = context;
- ctx.xwindow = xWin;
-
- XFree( visinfo );
- XFree( fbconfigs );
-
- return true;
-}
-
-
-Bool create_glx_dummy_context(OffscreenContext &ctx)
-{
- // This will alter ctx.openGLContext and ctx.xdisplay and ctx.xwindow if successfull
- int major;
- int minor;
- Bool result = False;
-
- ctx.xdisplay = XOpenDisplay( NULL );
- if ( ctx.xdisplay == NULL ) {
- cerr << "Unable to open a connection to the X server\n";
- return False;
- }
-
- // glxQueryVersion is not always reliable. Use it, but then
- // also check to see if GLX 1.3 functions exist
-
- glXQueryVersion(ctx.xdisplay, &major, &minor);
-
- if ( major==1 && minor<=2 && glXGetVisualFromFBConfig==NULL ) {
- cerr << "Error: GLX version 1.3 functions missing. "
- << "Your GLX version: " << major << "." << minor << endl;
- } else {
- result = create_glx_dummy_window(ctx);
- }
-
- if (!result) XCloseDisplay( ctx.xdisplay );
- return result;
-}
-
-OffscreenContext *create_offscreen_context(int w, int h)
-{
- OffscreenContext *ctx = new OffscreenContext;
- offscreen_context_init( *ctx, w, h );
-
- // before an FBO can be setup, a GLX context must be created
- // this call alters ctx->xDisplay and ctx->openGLContext
- // and ctx->xwindow if successfull
- if (!create_glx_dummy_context( *ctx )) {
- return NULL;
- }
-
- // glewInit must come after Context creation and before FBO calls.
- GLenum err = glewInit();
- if (GLEW_OK != err) {
- cerr << "Unable to init GLEW: " << glewGetErrorString(err) << endl;
- return NULL;
- }
-
- ctx->fbo = fbo_new();
- if (!fbo_init(ctx->fbo, w, h)) {
- cerr << "GL Framebuffer Object init failed; dumping GLEW info" << endl;
- return NULL;
- }
-
- return ctx;
-}
-
-bool teardown_offscreen_context(OffscreenContext *ctx)
-{
- if (ctx) {
- fbo_unbind(ctx->fbo);
- fbo_delete(ctx->fbo);
- XDestroyWindow( ctx->xdisplay, ctx->xwindow );
- glXDestroyContext( ctx->xdisplay, ctx->openGLContext );
- XCloseDisplay( ctx->xdisplay );
- return true;
- }
- return false;
-}
-
-/*!
- Capture framebuffer from OpenGL and write it to the given filename as PNG.
-*/
-bool save_framebuffer(OffscreenContext *ctx, const char *filename)
-{
- glXSwapBuffers(ctx->xdisplay, ctx->xwindow);
- if (!ctx || !filename) return false;
- int samplesPerPixel = 4; // R, G, B and A
- GLubyte pixels[ctx->width * ctx->height * samplesPerPixel];
- glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
-
- // Flip it vertically - images read from OpenGL buffers are upside-down
- int rowBytes = samplesPerPixel * ctx->width;
- unsigned char *flippedBuffer = (unsigned char *)malloc(rowBytes * ctx->height);
- if (!flippedBuffer) {
- cerr << "Unable to allocate flipped buffer for corrected image.";
- return 1;
- }
- flip_image(pixels, flippedBuffer, samplesPerPixel, ctx->width, ctx->height);
-
- bool writeok = write_png(filename, flippedBuffer, ctx->width, ctx->height);
-
- free(flippedBuffer);
-
- return writeok;
-}
-
-void bind_offscreen_context(OffscreenContext *ctx)
-{
- if (ctx) fbo_bind(ctx->fbo);
-}
diff --git a/tests/OffscreenContextWGL.cc b/tests/OffscreenContextWGL.cc
deleted file mode 100644
index 75a7ed2..0000000
--- a/tests/OffscreenContextWGL.cc
+++ /dev/null
@@ -1,247 +0,0 @@
-/*
-
-Create an OpenGL context without creating an OpenGL Window. for Windows.
-
-For more info:
-
- http://www.nullterminator.net/opengl32.html by Blaine Hodge
- http://msdn.microsoft.com/en-us/library/ee418815(v=vs.85).aspx
- http://www.cprogramming.com/tutorial/wgl_wiggle_functions.html by RoD
- ( which includes robot.cc by Steven Billington )
- http://blogs.msdn.com/b/oldnewthing/archive/2006/12/04/1205831.aspx by Tom
-*/
-
-#include <windows.h>
-#include <vector>
-
-#include "OffscreenContext.h"
-#include "printutils.h"
-#include "imageutils.h"
-#include "system-gl.h"
-#include "fbo.h"
-
-#include <GL/gl.h> // must be included after glew.h
-
-#include <map>
-#include <string>
-#include <sstream>
-
-using namespace std;
-
-struct OffscreenContext
-{
- HWND window;
- HDC dev_context;
- HGLRC openGLContext;
- int width;
- int height;
- fbo_t *fbo;
-};
-
-void offscreen_context_init(OffscreenContext &ctx, int width, int height)
-{
- ctx.window = (HWND)NULL;
- ctx.dev_context = (HDC)NULL;
- ctx.openGLContext = (HGLRC)NULL;
- ctx.width = width;
- ctx.height = height;
- ctx.fbo = NULL;
-}
-
-string get_os_info()
-{
- OSVERSIONINFO osvi;
-
- ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
- osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
- GetVersionEx(&osvi);
-
- SYSTEM_INFO si;
- GetSystemInfo(&si);
- map<WORD,const char*> archs;
- archs[PROCESSOR_ARCHITECTURE_AMD64] = "amd64";
- archs[PROCESSOR_ARCHITECTURE_IA64] = "itanium";
- archs[PROCESSOR_ARCHITECTURE_INTEL] = "x86";
- archs[PROCESSOR_ARCHITECTURE_UNKNOWN] = "unknown";
-
- stringstream out;
- out << "OS info: "
- << "Microsoft(TM) Windows(TM) " << osvi.dwMajorVersion << " "
- << osvi.dwMinorVersion << " " << osvi.dwBuildNumber << " "
- << osvi.szCSDVersion;
- if (archs.find(si.wProcessorArchitecture) != archs.end())
- out << " " << archs[si.wProcessorArchitecture];
- out << "\n";
-
- out << "Machine: " << si.dwProcessorType;
-
- return out.str();
-}
-
-string offscreen_context_getinfo(OffscreenContext *ctx)
-{
- stringstream out;
- out << "GL context creator: WGL\n"
- << "PNG generator: lodepng\n"
- << get_os_info();
- return out.str();
-}
-
-LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
-{
- return DefWindowProc( hwnd, message, wparam, lparam );
-}
-
-bool create_wgl_dummy_context(OffscreenContext &ctx)
-{
- // this function alters ctx->window and ctx->openGLContext
- // and ctx->dev_context if successfull
-
- // create window
-
- HINSTANCE inst = GetModuleHandle(0);
- WNDCLASS wc;
- ZeroMemory( &wc, sizeof( wc ) );
- wc.style = CS_OWNDC;
- wc.lpfnWndProc = WndProc;
- wc.hInstance = inst;
- wc.lpszClassName = (LPCWSTR)"OpenSCAD";
- RegisterClass( &wc );
-
- HWND window = CreateWindow( (LPCWSTR)"OpenSCAD", (LPCWSTR)"OpenSCAD",
- WS_CAPTION | WS_POPUPWINDOW, //| WS_VISIBLE,
- 0, 0, ctx.width, ctx.height, NULL, NULL, inst, NULL );
-
- if ( window==NULL ) {
- cerr << "MS GDI - CreateWindow failed\n";
- return false;
- }
-
- // create WGL context, make current
-
- PIXELFORMATDESCRIPTOR pixformat;
- int chosenformat;
- HDC dev_context = GetDC( window );
- if ( dev_context == NULL ) {
- cerr << "MS GDI - GetDC failed\n";
- return false;
- }
-
- ZeroMemory( &pixformat, sizeof( pixformat ) );
- pixformat.nSize = sizeof( pixformat );
- pixformat.nVersion = 1;
- pixformat.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
- pixformat.iPixelType = PFD_TYPE_RGBA;
- pixformat.cGreenBits = 8;
- pixformat.cRedBits = 8;
- pixformat.cBlueBits = 8;
- pixformat.cAlphaBits = 8;
- pixformat.cDepthBits = 24;
- pixformat.cStencilBits = 8;
-
- chosenformat = ChoosePixelFormat( dev_context, &pixformat );
- if (chosenformat==0) {
- cerr << "MS GDI - ChoosePixelFormat failed\n";
- return false;
- }
-
- bool spfok = SetPixelFormat( dev_context, chosenformat, &pixformat );
- if (!spfok) {
- cerr << "MS GDI - SetPixelFormat failed\n";
- return false;
- }
-
- HGLRC gl_render_context = wglCreateContext( dev_context );
- if ( gl_render_context == NULL ) {
- cerr << "MS WGL - wglCreateContext failed\n";
- ReleaseDC( ctx.window, ctx.dev_context );
- return false;
- }
-
- bool mcok = wglMakeCurrent( dev_context, gl_render_context );
- if (!mcok) {
- cerr << "MS WGL - wglMakeCurrent failed\n";
- return false;
- }
-
- ctx.window = window;
- ctx.dev_context = dev_context;
- ctx.openGLContext = gl_render_context;
-
- return true;
-}
-
-
-OffscreenContext *create_offscreen_context(int w, int h)
-{
- OffscreenContext *ctx = new OffscreenContext;
- offscreen_context_init( *ctx, w, h );
-
- // Before an FBO can be setup, a WGL context must be created.
- // This call alters ctx->window and ctx->openGLContext
- // and ctx->dev_context if successfull
- if (!create_wgl_dummy_context( *ctx )) {
- return NULL;
- }
-
- GLenum err = glewInit(); // must come after Context creation and before FBO calls.
- if (GLEW_OK != err) {
- cerr << "Unable to init GLEW: " << glewGetErrorString(err) << "\n";
- return NULL;
- }
- //cerr << glew_dump(0);
-
- ctx->fbo = fbo_new();
- if (!fbo_init(ctx->fbo, w, h)) {
- return NULL;
- }
-
- return ctx;
-}
-
-bool teardown_offscreen_context(OffscreenContext *ctx)
-{
- if (ctx) {
- fbo_unbind(ctx->fbo);
- fbo_delete(ctx->fbo);
-
- wglMakeCurrent( NULL, NULL );
- wglDeleteContext( ctx->openGLContext );
- ReleaseDC( ctx->window, ctx->dev_context );
-
- return true;
- }
- return false;
-}
-
-/*!
- Capture framebuffer from OpenGL and write it to the given filename as PNG.
-*/
-bool save_framebuffer(OffscreenContext *ctx, const char *filename)
-{
- wglSwapLayerBuffers( ctx->dev_context, WGL_SWAP_MAIN_PLANE );
- if (!ctx || !filename) return false;
- int samplesPerPixel = 4; // R, G, B and A
- vector<GLubyte> pixels(ctx->width * ctx->height * samplesPerPixel);
- glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]);
-
- // Flip it vertically - images read from OpenGL buffers are upside-down
- int rowBytes = samplesPerPixel * ctx->width;
- unsigned char *flippedBuffer = (unsigned char *)malloc(rowBytes * ctx->height);
- if (!flippedBuffer) {
- std::cerr << "Unable to allocate flipped buffer for corrected image.";
- return 1;
- }
- flip_image(&pixels[0], flippedBuffer, samplesPerPixel, ctx->width, ctx->height);
-
- bool writeok = write_png(filename, flippedBuffer, ctx->width, ctx->height);
-
- free(flippedBuffer);
-
- return writeok;
-}
-
-void bind_offscreen_context(OffscreenContext *ctx)
-{
- if (ctx) fbo_bind(ctx->fbo);
-}
diff --git a/tests/OffscreenView.cc b/tests/OffscreenView.cc
deleted file mode 100644
index 61d5818..0000000
--- a/tests/OffscreenView.cc
+++ /dev/null
@@ -1,170 +0,0 @@
-#include <GL/glew.h>
-#include "OffscreenView.h"
-#include "system-gl.h"
-#include "renderer.h"
-#include <math.h>
-#include <stdio.h>
-#include <string.h>
-#include <cstdlib>
-#include <sstream>
-
-#define FAR_FAR_AWAY 100000.0
-
-OffscreenView::OffscreenView(size_t width, size_t height)
- : orthomode(false), showaxes(false), showfaces(true), showedges(false),
- object_rot(35, 0, 25), camera_eye(0, 0, 0), camera_center(0, 0, 0)
-{
- for (int i = 0; i < 10; i++) this->shaderinfo[i] = 0;
- this->ctx = create_offscreen_context(width, height);
- if ( this->ctx == NULL ) throw -1;
-
- initializeGL();
- resizeGL(width, height);
-}
-
-OffscreenView::~OffscreenView()
-{
- teardown_offscreen_context(this->ctx);
-}
-
-void OffscreenView::setRenderer(Renderer* r)
-{
- this->renderer = r;
-}
-
-void OffscreenView::initializeGL()
-{
- glEnable(GL_DEPTH_TEST);
- glDepthRange(-FAR_FAR_AWAY, +FAR_FAR_AWAY);
-
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- GLfloat light_diffuse[] = {1.0, 1.0, 1.0, 1.0};
- GLfloat light_position0[] = {-1.0, -1.0, +1.0, 0.0};
- GLfloat light_position1[] = {+1.0, +1.0, -1.0, 0.0};
-
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position0);
- glEnable(GL_LIGHT0);
- glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT1, GL_POSITION, light_position1);
- glEnable(GL_LIGHT1);
- glEnable(GL_LIGHTING);
- glEnable(GL_NORMALIZE);
-
- glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
- glEnable(GL_COLOR_MATERIAL);
-
-
-}
-
-void OffscreenView::resizeGL(int w, int h)
-{
- this->width = w;
- this->height = h;
- glViewport(0, 0, w, h);
- w_h_ratio = sqrt((double)w / (double)h);
-}
-
-void OffscreenView::setupPerspective()
-{
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- double dist = (this->camera_center - this->camera_eye).norm();
- gluPerspective(45, w_h_ratio, 0.1*dist, 100*dist);
-}
-
-void OffscreenView::setupOrtho(bool offset)
-{
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (offset) glTranslated(-0.8, -0.8, 0);
- double l = (this->camera_center - this->camera_eye).norm() / 10;
- glOrtho(-w_h_ratio*l, +w_h_ratio*l,
- -(1/w_h_ratio)*l, +(1/w_h_ratio)*l,
- -FAR_FAR_AWAY, +FAR_FAR_AWAY);
-}
-
-void OffscreenView::paintGL()
-{
- glEnable(GL_LIGHTING);
-
- if (orthomode) setupOrtho();
- else setupPerspective();
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-
- glClearColor(1.0f, 1.0f, 0.92f, 1.0f);
-
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
-
- gluLookAt(this->camera_eye[0], this->camera_eye[1], this->camera_eye[2],
- this->camera_center[0], this->camera_center[1], this->camera_center[2],
- 0.0, 0.0, 1.0);
-
- // glRotated(object_rot[0], 1.0, 0.0, 0.0);
- // glRotated(object_rot[1], 0.0, 1.0, 0.0);
- // glRotated(object_rot[2], 0.0, 0.0, 1.0);
-
- // Large gray axis cross inline with the model
- // FIXME: This is always gray - adjust color to keep contrast with background
- if (showaxes)
- {
- glLineWidth(1);
- glColor3d(0.5, 0.5, 0.5);
- glBegin(GL_LINES);
- double l = 3*(this->camera_center - this->camera_eye).norm();
- glVertex3d(-l, 0, 0);
- glVertex3d(+l, 0, 0);
- glVertex3d(0, -l, 0);
- glVertex3d(0, +l, 0);
- glVertex3d(0, 0, -l);
- glVertex3d(0, 0, +l);
- glEnd();
- }
-
- glDepthFunc(GL_LESS);
- glCullFace(GL_BACK);
- glDisable(GL_CULL_FACE);
-
- glLineWidth(2);
- glColor3d(1.0, 0.0, 0.0);
-
- if (this->renderer) {
- this->renderer->draw(showfaces, showedges);
- }
-}
-
-bool OffscreenView::save(const char *filename)
-{
- return save_framebuffer(this->ctx, filename);
-}
-
-std::string OffscreenView::getInfo()
-{
- std::stringstream out;
- GLint rbits, gbits, bbits, abits, dbits, sbits;
- glGetIntegerv(GL_RED_BITS, &rbits);
- glGetIntegerv(GL_GREEN_BITS, &gbits);
- glGetIntegerv(GL_BLUE_BITS, &bbits);
- glGetIntegerv(GL_ALPHA_BITS, &abits);
- glGetIntegerv(GL_DEPTH_BITS, &dbits);
- glGetIntegerv(GL_STENCIL_BITS, &sbits);
-
- out << glew_dump(false)
- << "FBO: RGBA(" << rbits << gbits << bbits << abits
- << "), depth(" << dbits
- << "), stencil(" << sbits << ")\n"
- << offscreen_context_getinfo(this->ctx);
-
- return out.str();
-}
-
-void OffscreenView::setCamera(const Eigen::Vector3d &pos, const Eigen::Vector3d &center)
-{
- this->camera_eye = pos;
- this->camera_center = center;
-}
-
diff --git a/tests/OffscreenView.h b/tests/OffscreenView.h
deleted file mode 100644
index 8b98b29..0000000
--- a/tests/OffscreenView.h
+++ /dev/null
@@ -1,45 +0,0 @@
-#ifndef OFFSCREENVIEW_H_
-#define OFFSCREENVIEW_H_
-
-#include "OffscreenContext.h"
-#include <Eigen/Core>
-#include <Eigen/Geometry>
-#include <string>
-#ifndef _MSC_VER
-#include <stdint.h>
-#endif
-
-class OffscreenView
-{
-public:
- OffscreenView(size_t width, size_t height);
- ~OffscreenView();
- void setRenderer(class Renderer* r);
-
- void setCamera(const Eigen::Vector3d &pos, const Eigen::Vector3d &center);
- void initializeGL();
- void resizeGL(int w, int h);
- void setupPerspective();
- void setupOrtho(bool offset=false);
- void paintGL();
- bool save(const char *filename);
- std::string getInfo();
-
- GLint shaderinfo[11];
- OffscreenContext *ctx;
- size_t width;
- size_t height;
-private:
- Renderer *renderer;
- double w_h_ratio;
- Eigen::Vector3d object_rot;
- Eigen::Vector3d camera_eye;
- Eigen::Vector3d camera_center;
-
- bool orthomode;
- bool showaxes;
- bool showfaces;
- bool showedges;
-};
-
-#endif
diff --git a/tests/fbo.cc b/tests/fbo.cc
deleted file mode 100644
index a6677c1..0000000
--- a/tests/fbo.cc
+++ /dev/null
@@ -1,237 +0,0 @@
-#include "fbo.h"
-#include "system-gl.h"
-#include <stdio.h>
-#include <iostream>
-using namespace std;
-
-fbo_t *fbo_new()
-{
- fbo_t *fbo = new fbo_t;
- fbo->fbo_id = 0;
- fbo->old_fbo_id = 0;
- fbo->renderbuf_id = 0;
- fbo->depthbuf_id = 0;
-
- return fbo;
-}
-
-bool use_ext()
-{
- // do we need to use the EXT or ARB version?
- if (!glewIsSupported("GL_ARB_framebuffer_object") &&
- glewIsSupported("GL_EXT_framebuffer_object")) {
- return true;
- } else {
- return false;
- }
-}
-
-bool check_fbo_status()
-{
- /* This code is based on user V-man code from
- http://www.opengl.org/wiki/GL_EXT_framebuffer_multisample
- See also: http://www.songho.ca/opengl/gl_fbo.html */
- GLenum status;
- bool result = false;
- if (use_ext())
- status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
- else
- status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
-
- if (report_glerror("checking framebuffer status")) return false;
-
- if (status == GL_FRAMEBUFFER_COMPLETE)
- result = true;
- else if (status == GL_FRAMEBUFFER_UNSUPPORTED)
- cerr << "GL_FRAMEBUFFER_UNSUPPORTED\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT\n";
- else if (status == GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT)
- cerr << "GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT\n";
- else
- cerr << "Unknown Code: glCheckFramebufferStatusEXT returned %i\n",status;
- return result;
-}
-
-bool fbo_ext_init(fbo_t *fbo, size_t width, size_t height)
-{
- // Generate and bind FBO
- glGenFramebuffersEXT(1, &fbo->fbo_id);
- if (report_glerror("glGenFramebuffersEXT")) return false;
- glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo->fbo_id);
- if (report_glerror("glBindFramebufferEXT")) return false;
-
- // Generate depth and render buffers
- glGenRenderbuffersEXT(1, &fbo->depthbuf_id);
- glGenRenderbuffersEXT(1, &fbo->renderbuf_id);
-
- // Create buffers with correct size
- if (!fbo_resize(fbo, width, height)) return false;
-
- // Attach render and depth buffers
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
- GL_RENDERBUFFER_EXT, fbo->renderbuf_id);
- if (report_glerror("specifying color render buffer EXT")) return false;
-
-
- if (!check_fbo_status()) {
- cerr << "Problem with OpenGL EXT framebuffer after specifying color render buffer.\n";
- return false;
- }
-
- if (glewIsSupported("GL_EXT_packed_depth_stencil")) {
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
- if (report_glerror("specifying depth render buffer EXT")) return false;
-
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
- if (report_glerror("specifying stencil render buffer EXT")) return false;
-
- if (!check_fbo_status()) {
- cerr << "Problem with OpenGL EXT framebuffer after specifying depth render buffer.\n";
- return false;
- }
- }
- else {
- cerr << "Warning: Cannot create stencil buffer (GL_EXT_packed_depth_stencil not supported)\n";
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
- if (report_glerror("specifying depth render buffer EXT")) return false;
-
- if (!check_fbo_status()) {
- cerr << "Problem with OpenGL EXT framebuffer after specifying depth stencil render buffer.\n";
- return false;
- }
- }
-
- return true;
-}
-
-bool fbo_arb_init(fbo_t *fbo, size_t width, size_t height)
-{
- // Generate and bind FBO
- glGenFramebuffers(1, &fbo->fbo_id);
- if (report_glerror("glGenFramebuffers")) return false;
- glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo_id);
- if (report_glerror("glBindFramebuffer")) return false;
-
- // Generate depth and render buffers
- glGenRenderbuffers(1, &fbo->depthbuf_id);
- glGenRenderbuffers(1, &fbo->renderbuf_id);
-
- // Create buffers with correct size
- if (!fbo_resize(fbo, width, height)) return false;
-
- // Attach render and depth buffers
- glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
- GL_RENDERBUFFER, fbo->renderbuf_id);
- if (report_glerror("specifying color render buffer")) return false;
-
- if (!check_fbo_status()) {
- cerr << "Problem with OpenGL framebuffer after specifying color render buffer.\n";
- return false;
- }
-
- //glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
- // to prevent Mesa's software renderer from crashing, do this in two stages.
- // ie. instead of using GL_DEPTH_STENCIL_ATTACHMENT, do DEPTH then STENCIL.
- glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
- GL_RENDERBUFFER, fbo->depthbuf_id);
- glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
- GL_RENDERBUFFER, fbo->depthbuf_id);
- if (report_glerror("specifying depth stencil render buffer")) return false;
-
- if (!check_fbo_status()) {
- cerr << "Problem with OpenGL framebuffer after specifying depth render buffer.\n";
- return false;
- }
-
- return true;
-}
-
-
-bool fbo_init(fbo_t *fbo, size_t width, size_t height)
-{
- /*
- Some OpenGL drivers include the framebuffer functions but not with
- core or ARB names, only with the EXT name. This has been worked-around
- by deciding at runtime, using GLEW, which version needs to be used. See also:
-
- http://www.opengl.org/wiki/Framebuffer_Object
- http://stackoverflow.com/questions/6912988/glgenframebuffers-or-glgenframebuffersex
- http://www.devmaster.net/forums/showthread.php?t=10967
- */
-
- bool result = false;
- if (glewIsSupported("GL_ARB_framebuffer_object"))
- result = fbo_arb_init(fbo, width, height);
- else if (use_ext())
- result = fbo_ext_init(fbo, width, height);
- else
- cerr << "Framebuffer Object extension not found by GLEW\n";
- return result;
-}
-
-bool fbo_resize(fbo_t *fbo, size_t width, size_t height)
-{
- if (use_ext()) {
- glBindRenderbufferEXT(GL_RENDERBUFFER, fbo->depthbuf_id);
- if (glewIsSupported("GL_EXT_packed_depth_stencil")) {
- glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
- if (report_glerror("creating EXT depth stencil render buffer")) return false;
- }
- else {
- glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
- if (report_glerror("creating EXT depth render buffer")) return false;
- }
-
- glBindRenderbufferEXT(GL_RENDERBUFFER, fbo->renderbuf_id);
- glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_RGBA8, width, height);
- if (report_glerror("creating EXT color render buffer")) return false;
- } else {
- glBindRenderbuffer(GL_RENDERBUFFER, fbo->renderbuf_id);
- glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, width, height);
- if (report_glerror("creating color render buffer")) return false;
-
- glBindRenderbuffer(GL_RENDERBUFFER, fbo->depthbuf_id);
- glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
- if (report_glerror("creating depth stencil render buffer")) return false;
-
- }
-
- return true;
-}
-
-void fbo_delete(fbo_t *fbo)
-{
- delete fbo;
-}
-
-GLuint fbo_bind(fbo_t *fbo)
-{
- glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint *)&fbo->old_fbo_id);
- if (use_ext())
- glBindFramebufferEXT(GL_FRAMEBUFFER, fbo->fbo_id);
- else
- glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo_id);
- return fbo->old_fbo_id;
-}
-
-void fbo_unbind(fbo_t *fbo)
-{
- if (use_ext())
- glBindFramebufferEXT(GL_FRAMEBUFFER, fbo->old_fbo_id);
- else
- glBindFramebuffer(GL_FRAMEBUFFER, fbo->old_fbo_id);
-}
diff --git a/tests/fbo.h b/tests/fbo.h
deleted file mode 100644
index 943862f..0000000
--- a/tests/fbo.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef FBO_H_
-#define FBO_H_
-
-#include "system-gl.h"
-#include <stddef.h> // size_t
-
-struct fbo_t
-{
- GLuint fbo_id;
- GLuint old_fbo_id;
-
- GLuint renderbuf_id;
- GLuint depthbuf_id;
-};
-
-fbo_t *fbo_new();
-bool fbo_init(fbo_t *fbo, size_t width, size_t height);
-bool fbo_resize(fbo_t *fbo, size_t width, size_t height);
-void fbo_delete(fbo_t *fbo);
-GLuint fbo_bind(fbo_t *fbo);
-void fbo_unbind(fbo_t *fbo);
-
-bool REPORTGLERROR(const char * task);
-
-#endif
diff --git a/tests/imageutils-lodepng.cc b/tests/imageutils-lodepng.cc
deleted file mode 100644
index 8460d9e..0000000
--- a/tests/imageutils-lodepng.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-#include "lodepng.h"
-#include <stdio.h>
-
-bool write_png(const char *filename, unsigned char *pixels, int width, int height)
-{
- //encoder.settings.zlibsettings.windowSize = 2048;
- //LodePNG_Text_add(&encoder.infoPng.text, "Comment", "Created with LodePNG");
-
- size_t dataout_size = -1;
- unsigned char *dataout = (unsigned char *)malloc(width*height*4);
- LodePNG_encode(&dataout, &dataout_size, pixels, width, height, LCT_RGBA, 8);
- //LodePNG_saveFile(dataout, dataout_size, "blah2.png");
-
- FILE *f = fopen(filename, "wb");
- if (!f) {
- free(dataout);
- return false;
- }
-
- fwrite(dataout, 1, dataout_size, f);
- fclose(f);
- free(dataout);
- return true;
-}
diff --git a/tests/imageutils-macosx.cc b/tests/imageutils-macosx.cc
deleted file mode 100644
index 404052f..0000000
--- a/tests/imageutils-macosx.cc
+++ /dev/null
@@ -1,64 +0,0 @@
-#include <ApplicationServices/ApplicationServices.h>
-#include <iostream>
-
-bool write_png(const char *filename, unsigned char *pixels, int width, int height)
-{
- size_t rowBytes = width * 4;
-// CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
- CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
- CGBitmapInfo bitmapInfo = kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Big; // BGRA
- int bitsPerComponent = 8;
- CGContextRef contextRef = CGBitmapContextCreate(pixels, width, height,
- bitsPerComponent, rowBytes,
- colorSpace, bitmapInfo);
- if (!contextRef) {
- std::cerr << "Unable to create CGContextRef.";
- return false;
- }
-
- CGImageRef imageRef = CGBitmapContextCreateImage(contextRef);
- if (!imageRef) {
- std::cerr << "Unable to create CGImageRef.";
- return false;
- }
-
- CFStringRef fname = CFStringCreateWithCString(kCFAllocatorDefault, filename, kCFStringEncodingUTF8);
- CFURLRef fileURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
- fname, kCFURLPOSIXPathStyle, false);
- if (!fileURL) {
- std::cerr << "Unable to create file URL ref.";
- return false;
- }
-
- CGDataConsumerRef dataconsumer = CGDataConsumerCreateWithURL(fileURL);
- CFIndex fileImageIndex = 1;
- CFMutableDictionaryRef fileDict = NULL;
- CFStringRef fileUTType = kUTTypePNG;
- // Create an image destination opaque reference for authoring an image file
- CGImageDestinationRef imageDest = CGImageDestinationCreateWithDataConsumer(dataconsumer,
- fileUTType,
- fileImageIndex,
- fileDict);
- if (!imageDest) {
- std::cerr << "Unable to create CGImageDestinationRef.";
- return false;
- }
-
- CFIndex capacity = 1;
- CFMutableDictionaryRef imageProps =
- CFDictionaryCreateMutable(kCFAllocatorDefault,
- capacity,
- &kCFTypeDictionaryKeyCallBacks,
- &kCFTypeDictionaryValueCallBacks);
- CGImageDestinationAddImage(imageDest, imageRef, imageProps);
- CGImageDestinationFinalize(imageDest);
-
- CFRelease(imageDest);
- CFRelease(dataconsumer);
- CFRelease(fileURL);
- CFRelease(fname);
- CFRelease(imageProps);
- CGColorSpaceRelease(colorSpace);
- CGImageRelease(imageRef);
- return true;
-}
diff --git a/tests/imageutils.cc b/tests/imageutils.cc
deleted file mode 100644
index e15ba2b..0000000
--- a/tests/imageutils.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-#include "imageutils.h"
-#include <string.h>
-
-void flip_image(const unsigned char *src, unsigned char *dst, size_t pixelsize, size_t width, size_t height)
-{
- size_t rowBytes = pixelsize * width;
- for (size_t i = 0 ; i < height ; i++) {
- memmove(dst + (height - i - 1) * rowBytes, src + i * rowBytes, rowBytes);
- }
-}
-
-#ifdef __APPLE__
-#include "imageutils-macosx.cc"
-#else
-#include "imageutils-lodepng.cc"
-#endif
diff --git a/tests/imageutils.h b/tests/imageutils.h
deleted file mode 100644
index 72602a2..0000000
--- a/tests/imageutils.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef IMAGEUTILS_H_
-#define IMAGEUTILS_H_
-
-#include <stdlib.h>
-
-bool write_png(const char *filename, unsigned char *pixels, int width, int height);
-void flip_image(const unsigned char *src, unsigned char *dst, size_t pixelsize, size_t width, size_t height);
-
-#endif
diff --git a/tests/lodepng.cpp b/tests/lodepng.cpp
deleted file mode 100644
index 831194f..0000000
--- a/tests/lodepng.cpp
+++ /dev/null
@@ -1,5797 +0,0 @@
-/*
-LodePNG version 20110908
-
-Copyright (c) 2005-2011 Lode Vandevenne
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
-
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
-
- 3. This notice may not be removed or altered from any source
- distribution.
-*/
-
-/*
-The manual and changelog are in the header file "lodepng.h"
-Rename this file to lodepng.cpp to use it for C++, or to lodepng.c to use it for C.
-*/
-
-#include "lodepng.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#ifdef __cplusplus
-#include <fstream>
-#endif /*__cplusplus*/
-
-#define VERSION_STRING "20110908"
-
-/*
-This source file is built up in the following large parts. The code sections
-with the "LODEPNG_COMPILE_" #defines divide this up further in an intermixed way.
--Tools for C and common code for PNG and Zlib
--C Code for Zlib (huffman, deflate, ...)
--C Code for PNG (file format chunks, adam7, PNG filters, color conversions, ...)
--The C++ wrapper around all of the above
-*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* // Tools for C, and common code for PNG and Zlib. // */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-Often in case of an error a value is assigned to a variable and then it breaks
-out of a loop (to go to the cleanup phase of a function). This macro does that.
-It makes the error handling code shorter and more readable.
-
-Example: if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(9924);
-*/
-#define CERROR_BREAK(errorvar, code)\
-{\
- errorvar = code;\
- break;\
-}
-
-/*version of CERROR_BREAK that assumes the common case where the error variable is named "error"*/
-#define ERROR_BREAK(code) CERROR_BREAK(error, code)
-
-/*
-About vector, uivector, ucvector and string:
--All of them wrap dynamic arrays or text strings in a similar way.
--LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version.
--The string tools are made to avoid problems with compilers that declare things like strncat as deprecated.
--They're not used in the interface, only internally in this file as static functions.
--As with many other structs in this file, the init and cleanup functions serve as ctor and dtor.
-*/
-
-#ifdef LODEPNG_COMPILE_ZLIB
-#ifdef LODEPNG_COMPILE_ENCODER
-
-typedef struct vector /*dynamic vector of void* pointers. This one is used only by the deflate compressor*/
-{
- void* data;
- size_t size; /*in groups of bytes depending on type*/
- size_t allocsize; /*in bytes*/
- unsigned typesize; /*sizeof the type you store in data*/
-} vector;
-
-static unsigned vector_resize(vector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/
-{
- if(size * p->typesize > p->allocsize)
- {
- size_t newsize = size * p->typesize * 2;
- void* data = realloc(p->data, newsize);
- if(data)
- {
- p->allocsize = newsize;
- p->data = data;
- p->size = size;
- }
- else return 0;
- }
- else p->size = size;
- return 1;
-}
-
-/*resize and use destructor on elements if it gets smaller*/
-static unsigned vector_resized(vector* p, size_t size, void dtor(void*))
-{
- size_t i;
- if(size < p->size)
- {
- for(i = size; i < p->size; i++)
- {
- dtor(&((char*)(p->data))[i * p->typesize]);
- }
- }
- return vector_resize(p, size);
-}
-
-static void vector_cleanup(void* p)
-{
- ((vector*)p)->size = ((vector*)p)->allocsize = 0;
- free(((vector*)p)->data);
- ((vector*)p)->data = NULL;
-}
-
-static void vector_cleanupd(vector* p, void dtor(void*)) /*clear and use destructor on elements*/
-{
- vector_resized(p, 0, dtor);
- vector_cleanup(p);
-}
-
-static void vector_init(vector* p, unsigned typesize)
-{
- p->data = NULL;
- p->size = p->allocsize = 0;
- p->typesize = typesize;
-}
-
-static void vector_swap(vector* p, vector* q) /*they're supposed to have the same typesize*/
-{
- size_t tmp;
- void* tmpp;
- tmp = p->size; p->size = q->size; q->size = tmp;
- tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp;
- tmpp = p->data; p->data = q->data; q->data = tmpp;
-}
-
-static void* vector_get(vector* p, size_t index)
-{
- return &((char*)p->data)[index * p->typesize];
-}
-
-#endif /*LODEPNG_COMPILE_ENCODER*/
-#endif /*LODEPNG_COMPILE_ZLIB*/
-
-/* /////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_ZLIB
-/*dynamic vector of unsigned ints*/
-typedef struct uivector
-{
- unsigned* data;
- size_t size; /*size in number of unsigned longs*/
- size_t allocsize; /*allocated size in bytes*/
-} uivector;
-
-static void uivector_cleanup(void* p)
-{
- ((uivector*)p)->size = ((uivector*)p)->allocsize = 0;
- free(((uivector*)p)->data);
- ((uivector*)p)->data = NULL;
-}
-
-/*returns 1 if success, 0 if failure ==> nothing done*/
-static unsigned uivector_resize(uivector* p, size_t size)
-{
- if(size * sizeof(unsigned) > p->allocsize)
- {
- size_t newsize = size * sizeof(unsigned) * 2;
- void* data = realloc(p->data, newsize);
- if(data)
- {
- p->allocsize = newsize;
- p->data = (unsigned*)data;
- p->size = size;
- }
- else return 0;
- }
- else p->size = size;
- return 1;
-}
-
-/*resize and give all new elements the value*/
-static unsigned uivector_resizev(uivector* p, size_t size, unsigned value)
-{
- size_t oldsize = p->size, i;
- if(!uivector_resize(p, size)) return 0;
- for(i = oldsize; i < size; i++) p->data[i] = value;
- return 1;
-}
-
-static void uivector_init(uivector* p)
-{
- p->data = NULL;
- p->size = p->allocsize = 0;
-}
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/*returns 1 if success, 0 if failure ==> nothing done*/
-static unsigned uivector_push_back(uivector* p, unsigned c)
-{
- if(!uivector_resize(p, p->size + 1)) return 0;
- p->data[p->size - 1] = c;
- return 1;
-}
-
-/*copy q to p, returns 1 if success, 0 if failure ==> nothing done*/
-static unsigned uivector_copy(uivector* p, const uivector* q)
-{
- size_t i;
- if(!uivector_resize(p, q->size)) return 0;
- for(i = 0; i < q->size; i++) p->data[i] = q->data[i];
- return 1;
-}
-
-static void uivector_swap(uivector* p, uivector* q)
-{
- size_t tmp;
- unsigned* tmpp;
- tmp = p->size; p->size = q->size; q->size = tmp;
- tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp;
- tmpp = p->data; p->data = q->data; q->data = tmpp;
-}
-#endif /*LODEPNG_COMPILE_ENCODER*/
-#endif /*LODEPNG_COMPILE_ZLIB*/
-
-/* /////////////////////////////////////////////////////////////////////////// */
-
-/*dynamic vector of unsigned chars*/
-typedef struct ucvector
-{
- unsigned char* data;
- size_t size; /*used size*/
- size_t allocsize; /*allocated size*/
-} ucvector;
-
-static void ucvector_cleanup(void* p)
-{
- ((ucvector*)p)->size = ((ucvector*)p)->allocsize = 0;
- free(((ucvector*)p)->data);
- ((ucvector*)p)->data = NULL;
-}
-
-/*returns 1 if success, 0 if failure ==> nothing done*/
-static unsigned ucvector_resize(ucvector* p, size_t size)
-{
- if(size * sizeof(unsigned char) > p->allocsize)
- {
- size_t newsize = size * sizeof(unsigned char) * 2;
- void* data = realloc(p->data, newsize);
- if(data)
- {
- p->allocsize = newsize;
- p->data = (unsigned char*)data;
- p->size = size;
- }
- else return 0; /*error: not enough memory*/
- }
- else p->size = size;
- return 1;
-}
-
-#ifdef LODEPNG_COMPILE_DECODER
-#ifdef LODEPNG_COMPILE_PNG
-/*resize and give all new elements the value*/
-static unsigned ucvector_resizev(ucvector* p, size_t size, unsigned char value)
-{
- size_t oldsize = p->size, i;
- if(!ucvector_resize(p, size)) return 0;
- for(i = oldsize; i < size; i++) p->data[i] = value;
- return 1;
-}
-#endif /*LODEPNG_COMPILE_PNG*/
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-static void ucvector_init(ucvector* p)
-{
- p->data = NULL;
- p->size = p->allocsize = 0;
-}
-
-#ifdef LODEPNG_COMPILE_ZLIB
-/*you can both convert from vector to buffer&size and vica versa. If you use
-init_buffer to take over a buffer and size, it is not needed to use cleanup*/
-static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size)
-{
- p->data = buffer;
- p->allocsize = p->size = size;
-}
-#endif /*LODEPNG_COMPILE_ZLIB*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/*returns 1 if success, 0 if failure ==> nothing done*/
-static unsigned ucvector_push_back(ucvector* p, unsigned char c)
-{
- if(!ucvector_resize(p, p->size + 1)) return 0;
- p->data[p->size - 1] = c;
- return 1;
-}
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_PNG
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
-/*returns 1 if success, 0 if failure ==> nothing done*/
-static unsigned string_resize(char** out, size_t size)
-{
- char* data = (char*)realloc(*out, size + 1);
- if(data)
- {
- data[size] = 0; /*null termination char*/
- *out = data;
- }
- return data != 0;
-}
-
-/*init a {char*, size_t} pair for use as string*/
-static void string_init(char** out)
-{
- *out = NULL;
- string_resize(out, 0);
-}
-
-/*free the above pair again*/
-static void string_cleanup(char** out)
-{
- free(*out);
- *out = NULL;
-}
-
-static void string_set(char** out, const char* in)
-{
- size_t insize = strlen(in), i = 0;
- if(string_resize(out, insize))
- {
- for(i = 0; i < insize; i++)
- {
- (*out)[i] = in[i];
- }
- }
-}
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-#endif /*LODEPNG_COMPILE_PNG*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-unsigned LodePNG_read32bitInt(const unsigned char* buffer)
-{
- return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
-}
-
-/*buffer must have at least 4 allocated bytes available*/
-static void LodePNG_set32bitInt(unsigned char* buffer, unsigned value)
-{
- buffer[0] = (unsigned char)((value >> 24) & 0xff);
- buffer[1] = (unsigned char)((value >> 16) & 0xff);
- buffer[2] = (unsigned char)((value >> 8) & 0xff);
- buffer[3] = (unsigned char)((value ) & 0xff);
-}
-
-#ifdef LODEPNG_COMPILE_ENCODER
-static void LodePNG_add32bitInt(ucvector* buffer, unsigned value)
-{
- ucvector_resize(buffer, buffer->size + 4); /*todo: give error if resize failed*/
- LodePNG_set32bitInt(&buffer->data[buffer->size - 4], value);
-}
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / File IO / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_DISK
-
-unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename)
-{
- FILE* file;
- long size;
-
- /*provide some proper output values if error will happen*/
- *out = 0;
- *outsize = 0;
-
- file = fopen(filename, "rb");
- if(!file) return 78;
-
- /*get filesize:*/
- fseek(file , 0 , SEEK_END);
- size = ftell(file);
- rewind(file);
-
- /*read contents of the file into the vector*/
- *outsize = 0;
- *out = (unsigned char*)malloc((size_t)size);
- if(size && (*out)) (*outsize) = fread(*out, 1, (size_t)size, file);
-
- fclose(file);
- if(!(*out) && size) return 9900; /*the above malloc failed*/
- return 0;
-}
-
-/*write given buffer to the file, overwriting the file, it doesn't append to it.*/
-unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename)
-{
- FILE* file;
- file = fopen(filename, "wb" );
- if(!file) return 79;
- fwrite((char*)buffer , 1 , buffersize, file);
- fclose(file);
- return 0;
-}
-
-#endif /*LODEPNG_COMPILE_DISK*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* // End of common code and tools. Begin of Zlib related code. // */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_ZLIB
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Reading and writing single bits and bytes from/to stream for Deflate / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/*TODO: this ignores potential out of memory errors*/
-static void addBitToStream(size_t* bitpointer, ucvector* bitstream, unsigned char bit)
-{
- /*add a new byte at the end*/
- if((*bitpointer) % 8 == 0) ucvector_push_back(bitstream, (unsigned char)0);
- /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/
- (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7));
- (*bitpointer)++;
-}
-
-static void addBitsToStream(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits)
-{
- size_t i;
- for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> i) & 1));
-}
-
-static void addBitsToStreamReversed(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits)
-{
- size_t i;
- for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> (nbits - 1 - i)) & 1));
-}
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-#define READBIT(bitpointer, bitstream) ((bitstream[bitpointer >> 3] >> (bitpointer & 0x7)) & (unsigned char)1)
-
-static unsigned char readBitFromStream(size_t* bitpointer, const unsigned char* bitstream)
-{
- unsigned char result = (unsigned char)(READBIT(*bitpointer, bitstream));
- (*bitpointer)++;
- return result;
-}
-
-static unsigned readBitsFromStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits)
-{
- unsigned result = 0, i;
- for(i = 0; i < nbits; i++)
- {
- result += ((unsigned)READBIT(*bitpointer, bitstream)) << i;
- (*bitpointer)++;
- }
- return result;
-}
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Deflate - Huffman / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#define FIRST_LENGTH_CODE_INDEX 257
-#define LAST_LENGTH_CODE_INDEX 285
-/*256 literals, the end code, some length codes, and 2 unused codes*/
-#define NUM_DEFLATE_CODE_SYMBOLS 288
-/*the distance codes have their own symbols, 30 used, 2 unused*/
-#define NUM_DISTANCE_SYMBOLS 32
-/*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/
-#define NUM_CODE_LENGTH_CODES 19
-
-/*the base lengths represented by codes 257-285*/
-static const unsigned LENGTHBASE[29]
- = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59,
- 67, 83, 99, 115, 131, 163, 195, 227, 258};
-
-/*the extra bits used by codes 257-285 (added to base length)*/
-static const unsigned LENGTHEXTRA[29]
- = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
- 4, 4, 4, 4, 5, 5, 5, 5, 0};
-
-/*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/
-static const unsigned DISTANCEBASE[30]
- = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513,
- 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
-
-/*the extra bits of backwards distances (added to base)*/
-static const unsigned DISTANCEEXTRA[30]
- = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,
- 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
-
-/*the order in which "code length alphabet code lengths" are stored, out of this
-the huffman tree of the dynamic huffman tree lengths is generated*/
-static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES]
- = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-Huffman tree struct, containing multiple representations of the tree
-*/
-typedef struct HuffmanTree
-{
- uivector tree2d;
- uivector tree1d;
- uivector lengths; /*the lengths of the codes of the 1d-tree*/
- unsigned maxbitlen; /*maximum number of bits a single code can get*/
- unsigned numcodes; /*number of symbols in the alphabet = number of codes*/
-} HuffmanTree;
-
-/*function used for debug purposes to draw the tree in ascii art with C++*/
-/*#include <iostream>
-static void HuffmanTree_draw(HuffmanTree* tree)
-{
- std::cout << "tree. length: " << tree->numcodes << " maxbitlen: " << tree->maxbitlen << std::endl;
- for(size_t i = 0; i < tree->tree1d.size; i++)
- {
- if(tree->lengths.data[i])
- std::cout << i << " " << tree->tree1d.data[i] << " " << tree->lengths.data[i] << std::endl;
- }
- std::cout << std::endl;
-}*/
-
-static void HuffmanTree_init(HuffmanTree* tree)
-{
- uivector_init(&tree->tree2d);
- uivector_init(&tree->tree1d);
- uivector_init(&tree->lengths);
-}
-
-static void HuffmanTree_cleanup(HuffmanTree* tree)
-{
- uivector_cleanup(&tree->tree2d);
- uivector_cleanup(&tree->tree1d);
- uivector_cleanup(&tree->lengths);
-}
-
-/*the tree representation used by the decoder. return value is error*/
-static unsigned HuffmanTree_make2DTree(HuffmanTree* tree)
-{
- unsigned nodefilled = 0; /*up to which node it is filled*/
- unsigned treepos = 0; /*position in the tree (1 of the numcodes columns)*/
- unsigned n, i;
-
- if(!uivector_resize(&tree->tree2d, tree->numcodes * 2)) return 9901; /*alloc fail*/
-
- /*
- convert tree1d[] to tree2d[][]. In the 2D array, a value of 32767 means
- uninited, a value >= numcodes is an address to another bit, a value < numcodes
- is a code. The 2 rows are the 2 possible bit values (0 or 1), there are as
- many columns as codes - 1.
- A good huffmann tree has N * 2 - 1 nodes, of which N - 1 are internal nodes.
- Here, the internal nodes are stored (what their 0 and 1 option point to).
- There is only memory for such good tree currently, if there are more nodes
- (due to too long length codes), error 55 will happen
- */
- for(n = 0; n < tree->numcodes * 2; n++)
- {
- tree->tree2d.data[n] = 32767; /*32767 here means the tree2d isn't filled there yet*/
- }
-
- for(n = 0; n < tree->numcodes; n++) /*the codes*/
- {
- for(i = 0; i < tree->lengths.data[n]; i++) /*the bits for this code*/
- {
- unsigned char bit = (unsigned char)((tree->tree1d.data[n] >> (tree->lengths.data[n] - i - 1)) & 1);
- if(treepos > tree->numcodes - 2) return 55; /*error 55: oversubscribed; see description in header*/
- if(tree->tree2d.data[2 * treepos + bit] == 32767) /*not yet filled in*/
- {
- if(i + 1 == tree->lengths.data[n]) /*last bit*/
- {
- tree->tree2d.data[2 * treepos + bit] = n; /*put the current code in it*/
- treepos = 0;
- }
- else
- {
- /*put address of the next step in here, first that address has to be found of course
- (it's just nodefilled + 1)...*/
- nodefilled++;
- /*addresses encoded with numcodes added to it*/
- tree->tree2d.data[2 * treepos + bit] = nodefilled + tree->numcodes;
- treepos = nodefilled;
- }
- }
- else treepos = tree->tree2d.data[2 * treepos + bit] - tree->numcodes;
- }
- }
-
- for(n = 0; n < tree->numcodes * 2; n++)
- {
- if(tree->tree2d.data[n] == 32767) tree->tree2d.data[n] = 0; /*remove possible remaining 32767's*/
- }
-
- return 0;
-}
-
-/*
-Second step for the ...makeFromLengths and ...makeFromFrequencies functions.
-numcodes, lengths and maxbitlen must already be filled in correctly. return
-value is error.
-*/
-static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree)
-{
- uivector blcount;
- uivector nextcode;
- unsigned bits, n, error = 0;
-
- uivector_init(&blcount);
- uivector_init(&nextcode);
- if(!uivector_resize(&tree->tree1d, tree->numcodes)
- || !uivector_resizev(&blcount, tree->maxbitlen + 1, 0)
- || !uivector_resizev(&nextcode, tree->maxbitlen + 1, 0))
- error = 9902; /*alloc fail*/
-
- if(!error)
- {
- /*step 1: count number of instances of each code length*/
- for(bits = 0; bits < tree->numcodes; bits++) blcount.data[tree->lengths.data[bits]]++;
- /*step 2: generate the nextcode values*/
- for(bits = 1; bits <= tree->maxbitlen; bits++)
- {
- nextcode.data[bits] = (nextcode.data[bits - 1] + blcount.data[bits - 1]) << 1;
- }
- /*step 3: generate all the codes*/
- for(n = 0; n < tree->numcodes; n++)
- {
- if(tree->lengths.data[n] != 0) tree->tree1d.data[n] = nextcode.data[tree->lengths.data[n]]++;
- }
- }
-
- uivector_cleanup(&blcount);
- uivector_cleanup(&nextcode);
-
- if(!error) return HuffmanTree_make2DTree(tree);
- else return error;
-}
-
-/*
-given the code lengths (as stored in the PNG file), generate the tree as defined
-by Deflate. maxbitlen is the maximum bits that a code in the tree can have.
-return value is error.
-*/
-static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen,
- size_t numcodes, unsigned maxbitlen)
-{
- unsigned i;
- if(!uivector_resize(&tree->lengths, numcodes)) return 9903; /*alloc fail*/
- for(i = 0; i < numcodes; i++) tree->lengths.data[i] = bitlen[i];
- tree->numcodes = (unsigned)numcodes; /*number of symbols*/
- tree->maxbitlen = maxbitlen;
- return HuffmanTree_makeFromLengths2(tree);
-}
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
-/*
-A coin, this is the terminology used for the package-merge algorithm and the
-coin collector's problem. This is used to generate the huffman tree.
-A coin can be multiple coins (when they're merged)
-*/
-typedef struct Coin
-{
- uivector symbols;
- float weight; /*the sum of all weights in this coin*/
-} Coin;
-
-static void Coin_init(Coin* c)
-{
- uivector_init(&c->symbols);
-}
-
-/*argument c is void* so that this dtor can be given as function pointer to the vector resize function*/
-static void Coin_cleanup(void* c)
-{
- uivector_cleanup(&((Coin*)c)->symbols);
-}
-
-static void Coin_copy(Coin* c1, const Coin* c2)
-{
- c1->weight = c2->weight;
- uivector_copy(&c1->symbols, &c2->symbols);
-}
-
-static void addCoins(Coin* c1, const Coin* c2)
-{
- size_t i;
- for(i = 0; i < c2->symbols.size; i++) uivector_push_back(&c1->symbols, c2->symbols.data[i]);
- c1->weight += c2->weight;
-}
-
-/*
-Coin_sort: This uses a simple combsort to sort the data. This function is not critical for
-overall encoding speed and the data amount isn't that large.
-*/
-static void Coin_sort(Coin* data, size_t amount)
-{
- size_t gap = amount;
- unsigned char swapped = 0;
- while((gap > 1) || swapped)
- {
- size_t i;
- gap = (gap * 10) / 13; /*shrink factor 1.3*/
- if(gap == 9 || gap == 10) gap = 11; /*combsort11*/
- if(gap < 1) gap = 1;
- swapped = 0;
- for(i = 0; i < amount - gap; i++)
- {
- size_t j = i + gap;
- if(data[j].weight < data[i].weight)
- {
- float temp = data[j].weight; data[j].weight = data[i].weight; data[i].weight = temp;
- uivector_swap(&data[i].symbols, &data[j].symbols);
- swapped = 1;
- }
- }
- }
-}
-
-static unsigned HuffmanTree_fillInCoins(vector* coins, const unsigned* frequencies, unsigned numcodes, size_t sum)
-{
- unsigned i;
- for(i = 0; i < numcodes; i++)
- {
- Coin* coin;
- if(frequencies[i] == 0) continue; /*it's important to exclude symbols that aren't present*/
- if(!vector_resize(coins, coins->size + 1))
- {
- vector_cleanup(coins);
- return 9904; /*alloc fail*/
- }
- coin = (Coin*)(vector_get(coins, coins->size - 1));
- Coin_init(coin);
- coin->weight = frequencies[i] / (float)sum;
- uivector_push_back(&coin->symbols, i);
- }
- if(coins->size) Coin_sort((Coin*)coins->data, coins->size);
- return 0;
-}
-
-/*Create the Huffman tree given the symbol frequencies*/
-static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies,
- size_t numcodes, unsigned maxbitlen)
-{
- unsigned i, j;
- size_t sum = 0, numpresent = 0;
- unsigned error = 0;
-
- vector prev_row; /*type Coin, the previous row of coins*/
- vector coins; /*type Coin, the coins of the currently calculated row*/
-
- tree->maxbitlen = maxbitlen;
-
- for(i = 0; i < numcodes; i++)
- {
- if(frequencies[i] > 0)
- {
- numpresent++;
- sum += frequencies[i];
- }
- }
-
- if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/
- tree->numcodes = (unsigned)numcodes; /*number of symbols*/
- uivector_resize(&tree->lengths, 0);
- if(!uivector_resizev(&tree->lengths, tree->numcodes, 0)) return 9905; /*alloc fail*/
-
- /*there are no symbols at all, in that case add one symbol of value 0 to the tree (see RFC 1951 section 3.2.7) */
- if(numpresent == 0)
- {
- tree->lengths.data[0] = 1;
- return HuffmanTree_makeFromLengths2(tree);
- }
- /*the package merge algorithm gives wrong results if there's only one symbol
- (theoretically 0 bits would then suffice, but we need a proper symbol for zlib)*/
- else if(numpresent == 1)
- {
- for(i = 0; i < numcodes; i++) if(frequencies[i]) tree->lengths.data[i] = 1;
- return HuffmanTree_makeFromLengths2(tree);
- }
-
- vector_init(&coins, sizeof(Coin));
- vector_init(&prev_row, sizeof(Coin));
-
- /*Package-Merge algorithm represented by coin collector's problem
- For every symbol, maxbitlen coins will be created*/
-
- /*first row, lowest denominator*/
- error = HuffmanTree_fillInCoins(&coins, frequencies, tree->numcodes, sum);
- if(!error)
- {
- for(j = 1; j <= maxbitlen && !error; j++) /*each of the remaining rows*/
- {
- vector_swap(&coins, &prev_row); /*swap instead of copying*/
- if(!vector_resized(&coins, 0, Coin_cleanup)) ERROR_BREAK(9906 /*alloc fail*/);
- for(i = 0; i + 1 < prev_row.size; i += 2)
- {
- if(!vector_resize(&coins, coins.size + 1)) ERROR_BREAK(9907 /*alloc fail*/);
- Coin_init((Coin*)vector_get(&coins, coins.size - 1));
- Coin_copy((Coin*)vector_get(&coins, coins.size - 1), (Coin*)vector_get(&prev_row, i));
- /*merge the coins into packages*/
- addCoins((Coin*)vector_get(&coins, coins.size - 1), (Coin*)vector_get(&prev_row, i + 1));
- }
- if(j < maxbitlen)
- {
- error = HuffmanTree_fillInCoins(&coins, frequencies, tree->numcodes, sum);
- }
- }
- }
-
- if(!error)
- {
- /*keep the coins with lowest weight, so that they add up to the amount of symbols - 1*/
- vector_resized(&coins, numpresent - 1, Coin_cleanup);
-
- /*calculate the lenghts of each symbol, as the amount of times a coin of each symbol is used*/
- for(i = 0; i < coins.size; i++)
- {
- Coin* coin = (Coin*)vector_get(&coins, i);
- for(j = 0; j < coin->symbols.size; j++) tree->lengths.data[coin->symbols.data[j]]++;
- }
-
- error = HuffmanTree_makeFromLengths2(tree);
- }
-
- vector_cleanupd(&coins, Coin_cleanup);
- vector_cleanupd(&prev_row, Coin_cleanup);
-
- return error;
-}
-
-static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index)
-{
- return tree->tree1d.data[index];
-}
-
-static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index)
-{
- return tree->lengths.data[index];
-}
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-/*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/
-static unsigned generateFixedLitLenTree(HuffmanTree* tree)
-{
- unsigned i, error = 0;
- uivector bitlen;
- uivector_init(&bitlen);
- if(!uivector_resize(&bitlen, NUM_DEFLATE_CODE_SYMBOLS)) error = 9909; /*alloc fail*/
-
- if(!error)
- {
- /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/
- for(i = 0; i <= 143; i++) bitlen.data[i] = 8;
- for(i = 144; i <= 255; i++) bitlen.data[i] = 9;
- for(i = 256; i <= 279; i++) bitlen.data[i] = 7;
- for(i = 280; i <= 287; i++) bitlen.data[i] = 8;
-
- error = HuffmanTree_makeFromLengths(tree, bitlen.data, NUM_DEFLATE_CODE_SYMBOLS, 15);
- }
-
- uivector_cleanup(&bitlen);
- return error;
-}
-
-/*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/
-static unsigned generateFixedDistanceTree(HuffmanTree* tree)
-{
- unsigned i, error = 0;
- uivector bitlen;
- uivector_init(&bitlen);
- if(!uivector_resize(&bitlen, NUM_DISTANCE_SYMBOLS)) error = 9910; /*alloc fail*/
-
- /*there are 32 distance codes, but 30-31 are unused*/
- if(!error)
- {
- for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen.data[i] = 5;
- error = HuffmanTree_makeFromLengths(tree, bitlen.data, NUM_DISTANCE_SYMBOLS, 15);
- }
- uivector_cleanup(&bitlen);
- return error;
-}
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-/*
-returns the code, or (unsigned)(-1) if error happened
-inbitlength is the length of the complete buffer, in bits (so its byte length times 8)
-*/
-static unsigned huffmanDecodeSymbol(const unsigned char* in, size_t* bp,
- const HuffmanTree* codetree, size_t inbitlength)
-{
- unsigned treepos = 0, ct;
- for(;;)
- {
- if(*bp > inbitlength) return (unsigned)(-1); /*error: end of input memory reached without endcode*/
-
- /*
- decode the symbol from the tree. The "readBitFromStream" code is inlined in
- the expression below because this is the biggest bottleneck while decoding
- */
- ct = codetree->tree2d.data[(treepos << 1) + READBIT(*bp, in)];
- (*bp)++;
- if(ct < codetree->numcodes) return ct; /*the symbol is decoded, return it*/
- else treepos = ct - codetree->numcodes; /*symbol not yet decoded, instead move tree position*/
-
- if(treepos >= codetree->numcodes) return (unsigned)(-1); /*error: it appeared outside the codetree*/
- }
-}
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Inflator (Decompressor) / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/
-static void getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d)
-{
- /*error checking not done, this is fixed stuff, it works, it doesn't depend on the image*/
- /*TODO: out of memory errors could still happen...*/
- generateFixedLitLenTree(tree_ll);
- generateFixedDistanceTree(tree_d);
-}
-
-/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/
-static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d,
- const unsigned char* in, size_t* bp, size_t inlength)
-{
- /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/
- unsigned error = 0;
- unsigned n, HLIT, HDIST, HCLEN, i;
- size_t inbitlength = inlength * 8;
-
- /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/
- uivector bitlen_ll; /*lit,len code lengths*/
- uivector bitlen_d; /*dist code lengths*/
- /*code length code lengths ("clcl"), the bit lengths of the huffman tree used to compress bitlen_ll and bitlen_d*/
- uivector bitlen_cl;
- HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/
-
- if((*bp) >> 3 >= inlength - 2) return 49; /*the bit pointer is or will go past the memory*/
-
- /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/
- HLIT = readBitsFromStream(bp, in, 5) + 257;
- /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/
- HDIST = readBitsFromStream(bp, in, 5) + 1;
- /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/
- HCLEN = readBitsFromStream(bp, in, 4) + 4;
-
- HuffmanTree_init(&tree_cl);
- uivector_init(&bitlen_ll);
- uivector_init(&bitlen_d);
- uivector_init(&bitlen_cl);
-
- while(!error)
- {
- /*read the code length codes out of 3 * (amount of code length codes) bits*/
-
- if(!uivector_resize(&bitlen_cl, NUM_CODE_LENGTH_CODES)) ERROR_BREAK(9911);
-
- for(i = 0; i < NUM_CODE_LENGTH_CODES; i++)
- {
- if(i < HCLEN) bitlen_cl.data[CLCL_ORDER[i]] = readBitsFromStream(bp, in, 3);
- else bitlen_cl.data[CLCL_ORDER[i]] = 0; /*if not, it must stay 0*/
- }
-
- error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl.data, bitlen_cl.size, 7);
- if(error) break;
-
- /*now we can use this tree to read the lengths for the tree that this function will return*/
- uivector_resizev(&bitlen_ll, NUM_DEFLATE_CODE_SYMBOLS, 0);
- uivector_resizev(&bitlen_d, NUM_DISTANCE_SYMBOLS, 0);
- i = 0;
- if(!bitlen_ll.data || !bitlen_d.data) ERROR_BREAK(9912); /*alloc fail*/
-
- /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/
- while(i < HLIT + HDIST)
- {
- unsigned code = huffmanDecodeSymbol(in, bp, &tree_cl, inbitlength);
- if(code <= 15) /*a length code*/
- {
- if(i < HLIT) bitlen_ll.data[i] = code;
- else bitlen_d.data[i - HLIT] = code;
- i++;
- }
- else if(code == 16) /*repeat previous*/
- {
- unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/
- unsigned value; /*set value to the previous code*/
-
- if((*bp) >> 3 >= inlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
-
- replength += readBitsFromStream(bp, in, 2);
-
- if((i - 1) < HLIT) value = bitlen_ll.data[i - 1];
- else value = bitlen_d.data[i - HLIT - 1];
- /*repeat this value in the next lengths*/
- for(n = 0; n < replength; n++)
- {
- if(i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/
- if(i < HLIT) bitlen_ll.data[i] = value;
- else bitlen_d.data[i - HLIT] = value;
- i++;
- }
- }
- else if(code == 17) /*repeat "0" 3-10 times*/
- {
- unsigned replength = 3; /*read in the bits that indicate repeat length*/
- if((*bp) >> 3 >= inlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
-
- replength += readBitsFromStream(bp, in, 3);
-
- /*repeat this value in the next lengths*/
- for(n = 0; n < replength; n++)
- {
- if(i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/
-
- if(i < HLIT) bitlen_ll.data[i] = 0;
- else bitlen_d.data[i - HLIT] = 0;
- i++;
- }
- }
- else if(code == 18) /*repeat "0" 11-138 times*/
- {
- unsigned replength = 11; /*read in the bits that indicate repeat length*/
- if((*bp) >> 3 >= inlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
-
- replength += readBitsFromStream(bp, in, 7);
-
- /*repeat this value in the next lengths*/
- for(n = 0; n < replength; n++)
- {
- if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/
-
- if(i < HLIT) bitlen_ll.data[i] = 0;
- else bitlen_d.data[i - HLIT] = 0;
- i++;
- }
- }
- else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/
- {
- if(code == (unsigned)(-1))
- {
- /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
- (10=no endcode, 11=wrong jump outside of tree)*/
- error = (*bp) > inlength * 8 ? 10 : 11;
- }
- else error = 16; /*unexisting code, this can never happen*/
- break;
- }
- }
- if(error) break;
-
- if(bitlen_ll.data[256] == 0) ERROR_BREAK(64); /*the length of the end code 256 must be larger than 0*/
-
- /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/
- error = HuffmanTree_makeFromLengths(tree_ll, &bitlen_ll.data[0], bitlen_ll.size, 15);
- if(error) break;
- error = HuffmanTree_makeFromLengths(tree_d, &bitlen_d.data[0], bitlen_d.size, 15);
-
- break; /*end of error-while*/
- }
-
- uivector_cleanup(&bitlen_cl);
- uivector_cleanup(&bitlen_ll);
- uivector_cleanup(&bitlen_d);
- HuffmanTree_cleanup(&tree_cl);
-
- return error;
-}
-
-/*inflate a block with dynamic of fixed Huffman tree*/
-static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size_t* bp,
- size_t* pos, size_t inlength, unsigned btype)
-{
- unsigned error = 0;
- HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/
- HuffmanTree tree_d; /*the huffman tree for distance codes*/
- size_t inbitlength = inlength * 8;
-
- HuffmanTree_init(&tree_ll);
- HuffmanTree_init(&tree_d);
-
- if(btype == 1) getTreeInflateFixed(&tree_ll, &tree_d);
- else if(btype == 2)
- {
- error = getTreeInflateDynamic(&tree_ll, &tree_d, in, bp, inlength);
- }
-
- for(;;) /*decode all symbols until end reached*/
- {
- /*code_ll is literal, length or end code*/
- unsigned code_ll = huffmanDecodeSymbol(in, bp, &tree_ll, inbitlength);
- if(code_ll <= 255) /*literal symbol*/
- {
- if((*pos) >= out->size)
- {
- /*reserve more room at once*/
- if(!ucvector_resize(out, ((*pos) + 1) * 2)) ERROR_BREAK(9913 /*alloc fail*/);
- }
- out->data[(*pos)] = (unsigned char)(code_ll);
- (*pos)++;
- }
- else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/
- {
- unsigned code_d, distance;
- unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/
- size_t start, forward, backward, length;
-
- /*part 1: get length base*/
- length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX];
-
- /*part 2: get extra bits and add the value of that to length*/
- numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX];
- if(((*bp) >> 3) >= inlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/
- length += readBitsFromStream(bp, in, numextrabits_l);
-
- /*part 3: get distance code*/
- code_d = huffmanDecodeSymbol(in, bp, &tree_d, inbitlength);
- if(code_d > 29)
- {
- if(code_ll == (unsigned)(-1)) /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/
- {
- /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
- (10=no endcode, 11=wrong jump outside of tree)*/
- error = (*bp) > inlength * 8 ? 10 : 11;
- }
- else error = 18; /*error: invalid distance code (30-31 are never used)*/
- break;
- }
- distance = DISTANCEBASE[code_d];
-
- /*part 4: get extra bits from distance*/
- numextrabits_d = DISTANCEEXTRA[code_d];
- if(((*bp) >> 3) >= inlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/
-
- distance += readBitsFromStream(bp, in, numextrabits_d);
-
- /*part 5: fill in all the out[n] values based on the length and dist*/
- start = (*pos);
- backward = start - distance;
- if((*pos) + length >= out->size)
- {
- /*reserve more room at once*/
- if(!ucvector_resize(out, ((*pos) + length) * 2)) ERROR_BREAK(9914 /*alloc fail*/);
- }
-
- for(forward = 0; forward < length; forward++)
- {
- out->data[(*pos)] = out->data[backward];
- (*pos)++;
- backward++;
- if(backward >= start) backward = start - distance;
- }
- }
- else if(code_ll == 256)
- {
- break; /*end code, break the loop*/
- }
- else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/
- {
- /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
- (10=no endcode, 11=wrong jump outside of tree)*/
- error = (*bp) > inlength * 8 ? 10 : 11;
- break;
- }
- }
-
- HuffmanTree_cleanup(&tree_ll);
- HuffmanTree_cleanup(&tree_d);
-
- return error;
-}
-
-static unsigned inflateNoCompression(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength)
-{
- /*go to first boundary of byte*/
- size_t p;
- unsigned LEN, NLEN, n, error = 0;
- while(((*bp) & 0x7) != 0) (*bp)++;
- p = (*bp) / 8; /*byte position*/
-
- /*read LEN (2 bytes) and NLEN (2 bytes)*/
- if(p >= inlength - 4) return 52; /*error, bit pointer will jump past memory*/
- LEN = in[p] + 256 * in[p + 1]; p += 2;
- NLEN = in[p] + 256 * in[p + 1]; p += 2;
-
- /*check if 16-bit NLEN is really the one's complement of LEN*/
- if(LEN + NLEN != 65535) return 21; /*error: NLEN is not one's complement of LEN*/
-
- if((*pos) + LEN >= out->size)
- {
- if(!ucvector_resize(out, (*pos) + LEN)) return 9915; /*alloc fail*/
- }
-
- /*read the literal data: LEN bytes are now stored in the out buffer*/
- if(p + LEN > inlength) return 23; /*error: reading outside of in buffer*/
- for(n = 0; n < LEN; n++) out->data[(*pos)++] = in[p++];
-
- (*bp) = p * 8;
-
- return error;
-}
-
-/*inflate the deflated data (cfr. deflate spec); return value is the error*/
-static unsigned LodePNG_inflate(ucvector* out, const unsigned char* in, size_t insize, size_t inpos)
-{
- /*bit pointer in the "in" data, current byte is bp >> 3, current bit is bp & 0x7 (from lsb to msb of the byte)*/
- size_t bp = 0;
- unsigned BFINAL = 0;
- size_t pos = 0; /*byte position in the out buffer*/
-
- unsigned error = 0;
-
- while(!BFINAL)
- {
- unsigned BTYPE;
- if(bp + 2 >= insize * 8) return 52; /*error, bit pointer will jump past memory*/
- BFINAL = readBitFromStream(&bp, &in[inpos]);
- BTYPE = 1 * readBitFromStream(&bp, &in[inpos]);
- BTYPE += 2 * readBitFromStream(&bp, &in[inpos]);
-
- if(BTYPE == 3) return 20; /*error: invalid BTYPE*/
- else if(BTYPE == 0) error = inflateNoCompression(out, &in[inpos], &bp, &pos, insize); /*no compression*/
- else error = inflateHuffmanBlock(out, &in[inpos], &bp, &pos, insize, BTYPE); /*compression, BTYPE 01 or 10*/
-
- if(error) return error;
- }
-
- /*Only now we know the true size of out, resize it to that*/
- if(!ucvector_resize(out, pos)) error = 9916; /*alloc fail*/
-
- return error;
-}
-
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Deflator (Compressor) / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258;
-
-/*bitlen is the size in bits of the code*/
-static void addHuffmanSymbol(size_t* bp, ucvector* compressed, unsigned code, unsigned bitlen)
-{
- addBitsToStreamReversed(bp, compressed, code, bitlen);
-}
-
-/*search the index in the array, that has the largest value smaller than or equal to the given value,
-given array must be sorted (if no value is smaller, it returns the size of the given array)*/
-static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value)
-{
- /*linear search implementation*/
- /*for(size_t i = 1; i < array_size; i++) if(array[i] > value) return i - 1;
- return array_size - 1;*/
-
- /*binary search implementation (not that much faster) (precondition: array_size > 0)*/
- size_t left = 1;
- size_t right = array_size - 1;
- while(left <= right)
- {
- size_t mid = (left + right) / 2;
- if(array[mid] <= value) left = mid + 1; /*the value to find is more to the right*/
- else if(array[mid - 1] > value) right = mid - 1; /*the value to find is more to the left*/
- else return mid - 1;
- }
- return array_size - 1;
-}
-
-static void addLengthDistance(uivector* values, size_t length, size_t distance)
-{
- /*values in encoded vector are those used by deflate:
- 0-255: literal bytes
- 256: end
- 257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits)
- 286-287: invalid*/
-
- unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length);
- unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]);
- unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance);
- unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]);
-
- uivector_push_back(values, length_code + FIRST_LENGTH_CODE_INDEX);
- uivector_push_back(values, extra_length);
- uivector_push_back(values, dist_code);
- uivector_push_back(values, extra_distance);
-}
-
-#if 0
-/*the "brute force" version of the encodeLZ7 algorithm, not used anymore, kept here for reference*/
-static unsigned encodeLZ77_brute(uivector* out, const unsigned char* in, size_t insize, unsigned windowSize)
-{
- size_t pos;
- for(pos = 0; pos < insize; pos++)
- {
- size_t length = 0, offset = 0; /*the length and offset found for the current position*/
- size_t max_offset = pos < windowSize ? pos : windowSize; /*how far back to test*/
- size_t current_offset;
-
- /**search for the longest string, backwards through all possible distances (=offsets)**/
- for(current_offset = 1; current_offset < max_offset; current_offset++)
- {
- size_t backpos = pos - current_offset;
- if(in[backpos] == in[pos])
- {
- /*test the next characters*/
- size_t current_length = 1;
- size_t backtest = backpos + 1;
- size_t foretest = pos + 1;
- /*maximum supporte length by deflate is max length*/
- while(foretest < insize && in[backtest] == in[foretest] && current_length < MAX_SUPPORTED_DEFLATE_LENGTH)
- {
- if(backpos >= pos)
- {
- /*continue as if we work on the decoded bytes after pos by jumping back before pos*/
- backpos -= current_offset;
- }
- current_length++;
- backtest++;
- foretest++;
- }
- if(current_length > length)
- {
- length = current_length; /*the longest length*/
- offset = current_offset; /*the offset that is related to this longest length*/
- /*you can jump out of this for loop once a length of max length is found (gives significant speed gain)*/
- if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break;
- }
- }
- }
-
- /**encode it as length/distance pair or literal value**/
- if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/
- {
- uivector_push_back(out, in[pos]);
- }
- else
- {
- addLengthDistance(out, length, offset);
- pos += (length - 1);
- }
- } /*end of the loop through each character of input*/
- return 0;
-}
-#endif
-
-static const unsigned HASH_NUM_VALUES = 2048;
-static const unsigned HASH_NUM_CHARACTERS = 3;
-static const unsigned HASH_SHIFT = 2;
-/*
-The HASH_NUM_CHARACTERS value is used to make encoding faster by using longer
-sequences to generate a hash value from the stream bytes. Setting it to 3
-gives exactly the same compression as the brute force method, since deflate's
-run length encoding starts with lengths of 3. Setting it to higher values,
-like 6, can make the encoding faster (not always though!), but will cause the
-encoding to miss any length between 3 and this value, so that the compression
-may be worse (but this can vary too depending on the image, sometimes it is
-even a bit better instead).
-The HASH_NUM_VALUES is the amount of unique possible hash values that
-combinations of bytes can give, the higher it is the more memory is needed, but
-if it's too low the advantage of hashing is gone.
-*/
-
-static unsigned getHash(const unsigned char* data, size_t size, size_t pos, size_t num)
-{
- unsigned result = 0;
- size_t amount, i;
- if(pos >= size) return 0;
- amount = num;
- if(pos + amount >= size) amount = size - pos;
- for(i = 0; i < amount; i++) result ^= (data[pos + i] << (i * HASH_SHIFT));
- return result % HASH_NUM_VALUES;
-}
-
-static unsigned countInitialZeros(const unsigned char* data, size_t size, size_t pos)
-{
- size_t max_count = MAX_SUPPORTED_DEFLATE_LENGTH;
- size_t i;
- if(max_count > size - pos) max_count = size - pos;
- for(i = 0; i < max_count; i++)
- {
- if(data[pos + i] != 0)
- return i;
- }
- return max_count;
-}
-
-/*push a value to the vector in a circular way. This is to do as if we're extending
-the vector's size forever, but instead the size is limited to maxsize and it wraps
-around, to avoid too large memory size. The pos pointer gets updated to the current
-end (unless updatepos is false, in that case pos is only used to know the current
-value). returns 1 on success, 0 if fail*/
-static unsigned push_circular(uivector* v, unsigned* pos, unsigned value, size_t maxsize, unsigned updatepos)
-{
- if(v->size < maxsize)
- {
- if(!uivector_push_back(v, value)) return 0;
- if(updatepos) (*pos)++;
- }
- else
- {
- if(updatepos)
- {
- (*pos)++;
- if((*pos) > maxsize) (*pos) = 1;
- }
- v->data[(*pos) - 1] = value;
- }
- return 1;
-}
-
-/*Enable to use lazy instead of greedy matghing. It looks one byte further
-to see if that one gives a longer distance. This gives slightly better compression, at the cost
-of a speed loss.*/
-#define LAZY_MATCHING
-
-/*
-LZ77-encode the data. Return value is error code. The input are raw bytes, the output
-is in the form of unsigned integers with codes representing for example literal bytes, or
-length/distance pairs.
-It uses a hash table technique to let it encode faster. When doing LZ77 encoding, a
-sliding window (of windowSize) is used, and all past bytes in that window can be used as
-the "dictionary". A brute force search through all possible distances would be slow, and
-this hash technique is one out of several ways to speed this up.
-*/
-static unsigned encodeLZ77(uivector* out, const unsigned char* in, size_t insize, unsigned windowSize)
-{
- /**generate hash table**/
- /*
- The hash table is 2-dimensional. For every possible hash value, it contains a list of positions
- in the data where this hash occured.
- tablepos1 and tablepos2 remember the last used start and end index in the hash table for each hash value.
- */
- vector table; /*HASH_NUM_VALUES uivectors; this is what would be an std::vector<std::vector<unsigned> > in C++*/
- uivector tablepos1, tablepos2;
- /*hash 0 indicates a possible common case of a long sequence of zeros, store and use the amount here for a speedup*/
- uivector initialZerosTable;
- unsigned pos, i, error = 0;
- unsigned hash_num_characters = HASH_NUM_CHARACTERS;
-
- vector_init(&table, sizeof(uivector));
- if(!vector_resize(&table, HASH_NUM_VALUES)) return 9917; /*alloc fail*/
- for(i = 0; i < HASH_NUM_VALUES; i++)
- {
- uivector* v = (uivector*)vector_get(&table, i);
- uivector_init(v);
- }
-
- /*remember start and end positions in the tables to search in*/
- uivector_init(&tablepos1);
- uivector_init(&tablepos2);
- uivector_init(&initialZerosTable);
-
- if(!uivector_resizev(&tablepos1, HASH_NUM_VALUES, 0)) error = 9918; /*alloc fail*/
- if(!uivector_resizev(&tablepos2, HASH_NUM_VALUES, 0)) error = 9919; /*alloc fail*/
-
- if(!error)
- {
- unsigned offset, max_offset; /*the offset represents the distance in LZ77 terminology*/
- unsigned length, tablepos;
-#ifdef LAZY_MATCHING
- unsigned lazy = 0;
- unsigned lazylength, lazyoffset;
-#endif /*LAZY_MATCHING*/
- unsigned hash, initialZeros = 0;
- unsigned backpos, current_offset, t1, t2, t11, current_length;
- const unsigned char *lastptr, *foreptr, *backptr;
- uivector* v; /*vector from the hash table we're currently working on*/
- unsigned hashWindow = windowSize;
- unsigned numones = 0;
-
- for(pos = 0; pos < insize; pos++)
- {
- length = 0, offset = 0; /*the length and offset found for the current position*/
- max_offset = pos < windowSize ? pos : windowSize; /*how far back to test*/
-
- /*search for the longest string. First find out where in the table to start
- (the first value that is in the range from "pos - max_offset" to "pos")*/
- hash = getHash(in, insize, pos, hash_num_characters);
- v = (uivector*)vector_get(&table, hash);
- if(!push_circular(v, &tablepos2.data[hash], pos, hashWindow, 1)) ERROR_BREAK(9920 /*alloc fail*/);
-
- if(hash == 0)
- {
- initialZeros = countInitialZeros(in, insize, pos);
- if(!push_circular(&initialZerosTable, &tablepos2.data[hash], initialZeros, hashWindow, 0))
- ERROR_BREAK(9920 /*alloc fail*/);
- }
-
- while(v->data[tablepos1.data[hash]] < pos - max_offset)
- {
- /*it now points to the first value in the table for which the index is
- larger than or equal to pos - max_offset*/
- tablepos1.data[hash]++;
- if(tablepos1.data[hash] >= hashWindow) tablepos1.data[hash] = 0;
- }
-
- t1 = tablepos1.data[hash];
- t2 = tablepos2.data[hash] - 1;
- if(tablepos2.data[hash] == 0) t2 = hashWindow - 1;
-
- lastptr = &in[insize < pos + MAX_SUPPORTED_DEFLATE_LENGTH ? insize : pos + MAX_SUPPORTED_DEFLATE_LENGTH];
-
- t11 = t1 == 0 ? hashWindow - 1 : t1 - 1;
- for(tablepos = t2 == 0 ? hashWindow - 1 : t2 - 1;
- tablepos != t2 && tablepos != t11 && tablepos < v->size;
- tablepos = tablepos == 0 ? hashWindow - 1 : tablepos - 1)
- {
- backpos = v->data[tablepos];
- current_offset = pos - backpos;
- /*test the next characters*/
- foreptr = &in[pos];
- backptr = &in[backpos];
-
- if(hash == 0)
- {
- unsigned skip = initialZerosTable.data[tablepos];
- if(skip > initialZeros) skip = initialZeros;
- if(skip > insize - pos) skip = insize - pos;
- backptr += skip;
- foreptr += skip;
- }
- while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/
- {
- ++backptr;
- ++foreptr;
- }
- current_length = (unsigned)(foreptr - &in[pos]);
- if(current_length > length)
- {
- length = current_length; /*the longest length*/
- offset = current_offset; /*the offset that is related to this longest length*/
- /*you can jump out of this for loop once a length of max length is found (gives significant speed gain)*/
- if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break;
- }
- }
-
-#ifdef LAZY_MATCHING
- if(!lazy && length >= 3 && length < MAX_SUPPORTED_DEFLATE_LENGTH)
- {
- lazylength = length;
- lazyoffset = offset;
- lazy = 1;
- continue;
- }
- if(lazy)
- {
- if(pos == 0) ERROR_BREAK(81);
- lazy = 0;
- if(length > lazylength + 1)
- {
- /*push the previous character as literal*/
- if(!uivector_push_back(out, in[pos - 1])) ERROR_BREAK(9921 /*alloc fail*/);
- }
- else
- {
- length = lazylength;
- offset = lazyoffset;
- pos--;
- }
- }
-#endif /*LAZY_MATCHING*/
-
- /**encode it as length/distance pair or literal value**/
- if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/
- {
- if(!uivector_push_back(out, in[pos])) ERROR_BREAK(9921 /*alloc fail*/);
- }
- else
- {
- unsigned j, local_hash;
- addLengthDistance(out, length, offset);
- for(j = 0; j < length - 1; j++)
- {
- unsigned* t2p; /*pointer to current tablepos2 element*/
- pos++;
- local_hash = getHash(in, insize, pos, hash_num_characters);
- t2p = &tablepos2.data[local_hash];
- v = (uivector*)vector_get(&table, local_hash);
- if(!push_circular(v, t2p, pos, hashWindow, 1)) ERROR_BREAK(9920 /*alloc fail*/);
-
- if(local_hash == 0)
- {
- initialZeros = countInitialZeros(in, insize, pos);
- if(!push_circular(&initialZerosTable, t2p, initialZeros, hashWindow, 0))
- ERROR_BREAK(9922 /*alloc fail*/);
- }
- if(local_hash == 1 && hash_num_characters == 3)
- {
- /*
- If many hash values are getting grouped together in hash value 1, 4, 16, 20, ...,
- it indicates there are many near-zero values. This is not zero enough to benefit from a speed
- increase from the initialZerosTable, and makes it very slow. For that case only, switch to
- hash_num_characters = 6. Value 6 is experimentally found to be fastest. For this particular type
- of file, the compression isn't even worse, despite the fact that lengths < 6 are now no longer
- found, and that by changing hash_num_characters not all previously found hash values are still valid.
- Almost all images compress fast enough and smaller with hash_num_characters = 3, except sine plasma
- images. Those benefit a lot from this heuristic.
- */
- if(numones > 8192 && numones > pos / 16) hash_num_characters = 6;
- else numones++;
- }
- }
- }
- } /*end of the loop through each character of input*/
- } /*end of "if(!error)"*/
-
- /*cleanup*/
- for(i = 0; i < table.size; i++)
- {
- uivector* v = (uivector*)vector_get(&table, i);
- uivector_cleanup(v);
- }
- vector_cleanup(&table);
- uivector_cleanup(&tablepos1);
- uivector_cleanup(&tablepos2);
- uivector_cleanup(&initialZerosTable);
- return error;
-}
-
-/* /////////////////////////////////////////////////////////////////////////// */
-
-static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize)
-{
- /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte,
- 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/
-
- size_t i, j, numdeflateblocks = datasize / 65536 + 1;
- unsigned datapos = 0;
- for(i = 0; i < numdeflateblocks; i++)
- {
- unsigned BFINAL, BTYPE, LEN, NLEN;
- unsigned char firstbyte;
-
- BFINAL = (i == numdeflateblocks - 1);
- BTYPE = 0;
-
- firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1) << 1) + ((BTYPE & 2) << 1));
- ucvector_push_back(out, firstbyte);
-
- LEN = 65535;
- if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos;
- NLEN = 65535 - LEN;
-
- ucvector_push_back(out, (unsigned char)(LEN % 256));
- ucvector_push_back(out, (unsigned char)(LEN / 256));
- ucvector_push_back(out, (unsigned char)(NLEN % 256));
- ucvector_push_back(out, (unsigned char)(NLEN / 256));
-
- /*Decompressed data*/
- for(j = 0; j < 65535 && datapos < datasize; j++)
- {
- ucvector_push_back(out, data[datapos++]);
- }
- }
-
- return 0;
-}
-
-/*
-write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees.
-tree_ll: the tree for lit and len codes.
-tree_d: the tree for distance codes.
-*/
-static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encoded,
- const HuffmanTree* tree_ll, const HuffmanTree* tree_d)
-{
- size_t i = 0;
- for(i = 0; i < lz77_encoded->size; i++)
- {
- unsigned val = lz77_encoded->data[i];
- addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_ll, val), HuffmanTree_getLength(tree_ll, val));
- if(val > 256) /*for a length code, 3 more things have to be added*/
- {
- unsigned length_index = val - FIRST_LENGTH_CODE_INDEX;
- unsigned n_length_extra_bits = LENGTHEXTRA[length_index];
- unsigned length_extra_bits = lz77_encoded->data[++i];
-
- unsigned distance_code = lz77_encoded->data[++i];
-
- unsigned distance_index = distance_code;
- unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index];
- unsigned distance_extra_bits = lz77_encoded->data[++i];
-
- addBitsToStream(bp, out, length_extra_bits, n_length_extra_bits);
- addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_d, distance_code),
- HuffmanTree_getLength(tree_d, distance_code));
- addBitsToStream(bp, out, distance_extra_bits, n_distance_extra_bits);
- }
- }
-}
-
-/*Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/
-static unsigned deflateDynamic(ucvector* out, const unsigned char* data, size_t datasize,
- const LodePNG_CompressSettings* settings)
-{
- unsigned error = 0;
-
- /*
- A block is compressed as follows: The PNG data is lz77 encoded, resulting in
- literal bytes and length/distance pairs. This is then huffman compressed with
- two huffman trees. One huffman tree is used for the lit and len values ("ll"),
- another huffman tree is used for the dist values ("d"). These two trees are
- stored using their code lengths, and to compress even more these code lengths
- are also run-length encoded and huffman compressed. This gives a huffman tree
- of code lengths "cl". The code lenghts used to describe this third tree are
- the code length code lengths ("clcl").
- */
-
- /*The lz77 encoded data, represented with integers since there will also be length and distance codes in it*/
- uivector lz77_encoded;
- HuffmanTree tree_ll; /*tree for lit,len values*/
- HuffmanTree tree_d; /*tree for distance codes*/
- HuffmanTree tree_cl; /*tree for encoding the code lengths representing tree_ll and tree_d*/
- uivector frequencies_ll; /*frequency of lit,len codes*/
- uivector frequencies_d; /*frequency of dist codes*/
- uivector frequencies_cl; /*frequency of code length codes*/
- uivector bitlen_lld; /*lit,len,dist code lenghts (int bits), literally (without repeat codes).*/
- uivector bitlen_lld_e; /*bitlen_lld encoded with repeat codes (this is a rudemtary run length compression)*/
- /*bitlen_cl is the code length code lengths ("clcl"). The bit lengths of codes to represent tree_cl
- (these are written as is in the file, it would be crazy to compress these using yet another huffman
- tree that needs to be represented by yet another set of code lengths)*/
- uivector bitlen_cl;
-
- /*
- Due to the huffman compression of huffman tree representations ("two levels"), there are some anologies:
- bitlen_lld is to tree_cl what data is to tree_ll and tree_d.
- bitlen_lld_e is to bitlen_lld what lz77_encoded is to data.
- bitlen_cl is to bitlen_lld_e what bitlen_lld is to lz77_encoded.
- */
-
- unsigned BFINAL = 1; /*make only one block... the first and final one*/
- size_t numcodes_ll, numcodes_d, i;
- size_t bp = 0; /*the bit pointer*/
- unsigned HLIT, HDIST, HCLEN;
-
- uivector_init(&lz77_encoded);
- HuffmanTree_init(&tree_ll);
- HuffmanTree_init(&tree_d);
- HuffmanTree_init(&tree_cl);
- uivector_init(&frequencies_ll);
- uivector_init(&frequencies_d);
- uivector_init(&frequencies_cl);
- uivector_init(&bitlen_lld);
- uivector_init(&bitlen_lld_e);
- uivector_init(&bitlen_cl);
-
- /*This while loop is never loops due to a break at the end, it is here to
- allow breaking out of it to the cleanup phase on error conditions.*/
- while(!error)
- {
- if(settings->useLZ77)
- {
- error = encodeLZ77(&lz77_encoded, data, datasize, settings->windowSize); /*LZ77 encoded*/
- if(error) break;
- }
- else
- {
- if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(9923 /*alloc fail*/);
- for(i = 0; i < datasize; i++) lz77_encoded.data[i] = data[i]; /*no LZ77, but still will be Huffman compressed*/
- }
-
- if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(9924 /*alloc fail*/);
- if(!uivector_resizev(&frequencies_d, 30, 0)) ERROR_BREAK(9925 /*alloc fail*/);
-
- /*Count the frequencies of lit, len and dist codes*/
- for(i = 0; i < lz77_encoded.size; i++)
- {
- unsigned symbol = lz77_encoded.data[i];
- frequencies_ll.data[symbol]++;
- if(symbol > 256)
- {
- unsigned dist = lz77_encoded.data[i + 2];
- frequencies_d.data[dist]++;
- i += 3;
- }
- }
- frequencies_ll.data[256] = 1; /*there will be exactly 1 end code, at the end of the block*/
-
- /*Make both huffman trees, one for the lit and len codes, one for the dist codes*/
- error = HuffmanTree_makeFromFrequencies(&tree_ll, frequencies_ll.data, frequencies_ll.size, 15);
- if(error) break;
- error = HuffmanTree_makeFromFrequencies(&tree_d, frequencies_d.data, frequencies_d.size, 15);
- if(error) break;
-
- numcodes_ll = tree_ll.numcodes; if(numcodes_ll > 286) numcodes_ll = 286;
- numcodes_d = tree_d.numcodes; if(numcodes_d > 30) numcodes_d = 30;
- /*store the code lengths of both generated trees in bitlen_lld*/
- for(i = 0; i < numcodes_ll; i++) uivector_push_back(&bitlen_lld, HuffmanTree_getLength(&tree_ll, (unsigned)i));
- for(i = 0; i < numcodes_d; i++) uivector_push_back(&bitlen_lld, HuffmanTree_getLength(&tree_d, (unsigned)i));
-
- /*run-length compress bitlen_ldd into bitlen_lld_e by using repeat codes 16 (copy length 3-6 times),
- 17 (3-10 zeroes), 18 (11-138 zeroes)*/
- for(i = 0; i < (unsigned)bitlen_lld.size; i++)
- {
- unsigned j = 0; /*amount of repititions*/
- while(i + j + 1 < (unsigned)bitlen_lld.size && bitlen_lld.data[i + j + 1] == bitlen_lld.data[i]) j++;
-
- if(bitlen_lld.data[i] == 0 && j >= 2) /*repeat code for zeroes*/
- {
- j++; /*include the first zero*/
- if(j <= 10) /*repeat code 17 supports max 10 zeroes*/
- {
- uivector_push_back(&bitlen_lld_e, 17);
- uivector_push_back(&bitlen_lld_e, j - 3);
- }
- else /*repeat code 18 supports max 138 zeroes*/
- {
- if(j > 138) j = 138;
- uivector_push_back(&bitlen_lld_e, 18);
- uivector_push_back(&bitlen_lld_e, j - 11);
- }
- i += (j - 1);
- }
- else if(j >= 3) /*repeat code for value other than zero*/
- {
- size_t k;
- unsigned num = j / 6, rest = j % 6;
- uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]);
- for(k = 0; k < num; k++)
- {
- uivector_push_back(&bitlen_lld_e, 16);
- uivector_push_back(&bitlen_lld_e, 6 - 3);
- }
- if(rest >= 3)
- {
- uivector_push_back(&bitlen_lld_e, 16);
- uivector_push_back(&bitlen_lld_e, rest - 3);
- }
- else j -= rest;
- i += j;
- }
- else /*too short to benefit from repeat code*/
- {
- uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]);
- }
- }
-
- /*generate tree_cl, the huffmantree of huffmantrees*/
-
- if(!uivector_resizev(&frequencies_cl, NUM_CODE_LENGTH_CODES, 0)) ERROR_BREAK(9926 /*alloc fail*/);
- for(i = 0; i < bitlen_lld_e.size; i++)
- {
- frequencies_cl.data[bitlen_lld_e.data[i]]++;
- /*after a repeat code come the bits that specify the number of repetitions,
- those don't need to be in the frequencies_cl calculation*/
- if(bitlen_lld_e.data[i] >= 16) i++;
- }
-
- error = HuffmanTree_makeFromFrequencies(&tree_cl, frequencies_cl.data, frequencies_cl.size, 7);
- if(error) break;
-
- if(!uivector_resize(&bitlen_cl, NUM_CODE_LENGTH_CODES)) ERROR_BREAK(9927 /*alloc fail*/);
- for(i = 0; i < NUM_CODE_LENGTH_CODES; i++)
- {
- /*lenghts of code length tree is in the order as specified by deflate*/
- bitlen_cl.data[i] = HuffmanTree_getLength(&tree_cl, CLCL_ORDER[i]);
- }
- while(bitlen_cl.data[bitlen_cl.size - 1] == 0 && bitlen_cl.size > 4)
- {
- /*remove zeros at the end, but minimum size must be 4*/
- if(!uivector_resize(&bitlen_cl, bitlen_cl.size - 1)) ERROR_BREAK(9928 /*alloc fail*/);
- }
- if(error) break;
-
- /*
- Write everything into the output
-
- After the BFINAL and BTYPE, the dynamic block consists out of the following:
- - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN
- - (HCLEN+4)*3 bits code lengths of code length alphabet
- - HLIT + 257 code lenghts of lit/length alphabet (encoded using the code length
- alphabet, + possible repetition codes 16, 17, 18)
- - HDIST + 1 code lengths of distance alphabet (encoded using the code length
- alphabet, + possible repetition codes 16, 17, 18)
- - compressed data
- - 256 (end code)
- */
-
- /*Write block type*/
- addBitToStream(&bp, out, BFINAL);
- addBitToStream(&bp, out, 0); /*first bit of BTYPE "dynamic"*/
- addBitToStream(&bp, out, 1); /*second bit of BTYPE "dynamic"*/
-
- /*write the HLIT, HDIST and HCLEN values*/
- HLIT = (unsigned)(numcodes_ll - 257);
- HDIST = (unsigned)(numcodes_d - 1);
- HCLEN = (unsigned)bitlen_cl.size - 4;
- addBitsToStream(&bp, out, HLIT, 5);
- addBitsToStream(&bp, out, HDIST, 5);
- addBitsToStream(&bp, out, HCLEN, 4);
-
- /*write the code lenghts of the code length alphabet*/
- for(i = 0; i < HCLEN + 4; i++) addBitsToStream(&bp, out, bitlen_cl.data[i], 3);
-
- /*write the lenghts of the lit/len AND the dist alphabet*/
- for(i = 0; i < bitlen_lld_e.size; i++)
- {
- addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&tree_cl, bitlen_lld_e.data[i]),
- HuffmanTree_getLength(&tree_cl, bitlen_lld_e.data[i]));
- /*extra bits of repeat codes*/
- if(bitlen_lld_e.data[i] == 16) addBitsToStream(&bp, out, bitlen_lld_e.data[++i], 2);
- else if(bitlen_lld_e.data[i] == 17) addBitsToStream(&bp, out, bitlen_lld_e.data[++i], 3);
- else if(bitlen_lld_e.data[i] == 18) addBitsToStream(&bp, out, bitlen_lld_e.data[++i], 7);
- }
-
- /*write the compressed data symbols*/
- writeLZ77data(&bp, out, &lz77_encoded, &tree_ll, &tree_d);
- /*error: the length of the end code 256 must be larger than 0*/
- if(HuffmanTree_getLength(&tree_ll, 256) == 0) ERROR_BREAK(64);
-
- /*write the end code*/
- addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256));
-
- break; /*end of error-while*/
- }
-
- /*cleanup*/
- uivector_cleanup(&lz77_encoded);
- HuffmanTree_cleanup(&tree_ll);
- HuffmanTree_cleanup(&tree_d);
- HuffmanTree_cleanup(&tree_cl);
- uivector_cleanup(&frequencies_ll);
- uivector_cleanup(&frequencies_d);
- uivector_cleanup(&frequencies_cl);
- uivector_cleanup(&bitlen_lld_e);
- uivector_cleanup(&bitlen_lld);
- uivector_cleanup(&bitlen_cl);
-
- return error;
-}
-
-static unsigned deflateFixed(ucvector* out, const unsigned char* data,
- size_t datasize, const LodePNG_CompressSettings* settings)
-{
- HuffmanTree tree_ll; /*tree for literal values and length codes*/
- HuffmanTree tree_d; /*tree for distance codes*/
-
- unsigned BFINAL = 1; /*make only one block... the first and final one*/
- unsigned error = 0;
- size_t i, bp = 0; /*the bit pointer*/
-
- HuffmanTree_init(&tree_ll);
- HuffmanTree_init(&tree_d);
-
- generateFixedLitLenTree(&tree_ll);
- generateFixedDistanceTree(&tree_d);
-
- addBitToStream(&bp, out, BFINAL);
- addBitToStream(&bp, out, 1); /*first bit of BTYPE*/
- addBitToStream(&bp, out, 0); /*second bit of BTYPE*/
-
- if(settings->useLZ77) /*LZ77 encoded*/
- {
- uivector lz77_encoded;
- uivector_init(&lz77_encoded);
- error = encodeLZ77(&lz77_encoded, data, datasize, settings->windowSize);
- if(!error) writeLZ77data(&bp, out, &lz77_encoded, &tree_ll, &tree_d);
- uivector_cleanup(&lz77_encoded);
- }
- else /*no LZ77, but still will be Huffman compressed*/
- {
- for(i = 0; i < datasize; i++)
- {
- addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&tree_ll, data[i]), HuffmanTree_getLength(&tree_ll, data[i]));
- }
- }
- /*add END code*/
- if(!error) addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256));
-
- /*cleanup*/
- HuffmanTree_cleanup(&tree_ll);
- HuffmanTree_cleanup(&tree_d);
-
- return error;
-}
-
-static unsigned LodePNG_deflate(ucvector* out, const unsigned char* data, size_t datasize,
- const LodePNG_CompressSettings* settings)
-{
- unsigned error = 0;
- if(settings->btype == 0) error = deflateNoCompression(out, data, datasize);
- else if(settings->btype == 1) error = deflateFixed(out, data, datasize, settings);
- else if(settings->btype == 2) error = deflateDynamic(out, data, datasize, settings);
- else error = 61;
- return error;
-}
-
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Adler32 */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len)
-{
- unsigned s1 = adler & 0xffff;
- unsigned s2 = (adler >> 16) & 0xffff;
-
- while(len > 0)
- {
- /*at least 5550 sums can be done before the sums overflow, saving a lot of module divisions*/
- unsigned amount = len > 5550 ? 5550 : len;
- len -= amount;
- while(amount > 0)
- {
- s1 = (s1 + *data++);
- s2 = (s2 + s1);
- amount--;
- }
- s1 %= 65521;
- s2 %= 65521;
- }
-
- return (s2 << 16) | s1;
-}
-
-/*Return the adler32 of the bytes data[0..len-1]*/
-static unsigned adler32(const unsigned char* data, unsigned len)
-{
- return update_adler32(1L, data, len);
-}
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Zlib / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-unsigned LodePNG_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in,
- size_t insize, const LodePNG_DecompressSettings* settings)
-{
- unsigned error = 0;
- unsigned CM, CINFO, FDICT;
- ucvector outv;
-
- if(insize < 2) return 53; /*error, size of zlib data too small*/
- /*read information from zlib header*/
- if((in[0] * 256 + in[1]) % 31 != 0)
- {
- /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/
- return 24;
- }
-
- CM = in[0] & 15;
- CINFO = (in[0] >> 4) & 15;
- /*FCHECK = in[1] & 31;*/ /*FCHECK is already tested above*/
- FDICT = (in[1] >> 5) & 1;
- /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/
-
- if(CM != 8 || CINFO > 7)
- {
- /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/
- return 25;
- }
- if(FDICT != 0)
- {
- /*error: the specification of PNG says about the zlib stream:
- "The additional flags shall not specify a preset dictionary."*/
- return 26;
- }
-
- /*ucvector-controlled version of the output buffer, for dynamic array*/
- ucvector_init_buffer(&outv, *out, *outsize);
- error = LodePNG_inflate(&outv, in, insize, 2);
- *out = outv.data;
- *outsize = outv.size;
- if(error) return error;
-
- if(!settings->ignoreAdler32)
- {
- unsigned ADLER32 = LodePNG_read32bitInt(&in[insize - 4]);
- unsigned checksum = adler32(outv.data, (unsigned)outv.size);
- if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/
- }
-
- return 0; /*no error*/
-}
-
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
-unsigned LodePNG_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
- size_t insize, const LodePNG_CompressSettings* settings)
-{
- /*initially, *out must be NULL and outsize 0, if you just give some random *out
- that's pointing to a non allocated buffer, this'll crash*/
- ucvector deflatedata, outv;
- size_t i;
- unsigned error;
-
- unsigned ADLER32;
- /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/
- unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/
- unsigned FLEVEL = 0;
- unsigned FDICT = 0;
- unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64;
- unsigned FCHECK = 31 - CMFFLG % 31;
- CMFFLG += FCHECK;
-
- /*ucvector-controlled version of the output buffer, for dynamic array*/
- ucvector_init_buffer(&outv, *out, *outsize);
-
- ucvector_push_back(&outv, (unsigned char)(CMFFLG / 256));
- ucvector_push_back(&outv, (unsigned char)(CMFFLG % 256));
-
- ucvector_init(&deflatedata);
- error = LodePNG_deflate(&deflatedata, in, insize, settings);
-
- if(!error)
- {
- ADLER32 = adler32(in, (unsigned)insize);
- for(i = 0; i < deflatedata.size; i++) ucvector_push_back(&outv, deflatedata.data[i]);
- ucvector_cleanup(&deflatedata);
- LodePNG_add32bitInt(&outv, ADLER32);
- }
-
- *out = outv.data;
- *outsize = outv.size;
-
- return error;
-}
-
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#else /*no LODEPNG_COMPILE_ZLIB*/
-
-/*
-Dummy functions used if LODEPNG_COMPILE_ZLIB isn't defined. You need to implement
-these yourself when disabling the LodePNG Zlib part, e.g. by calling another
-library from here.
-
-*out must be NULL and *outsize must be 0 initially, and after the function is done,
-*out must point to the decompressed data, *outsize must be the size of it, and must
-be the size of the useful data in bytes, not the alloc size.
-*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-static unsigned LodePNG_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in,
- size_t insize, const LodePNG_DecompressSettings* settings)
-{
- return 0; //Placeholder to be implemented if LODEPNG_COMPILE_ZLIB is disabled.
-}
-#endif /*LODEPNG_COMPILE_DECODER*/
-#ifdef LODEPNG_COMPILE_ENCODER
-static unsigned LodePNG_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
- size_t insize, const LodePNG_CompressSettings* settings)
-{
- return 0; //Placeholder to be implemented if LODEPNG_COMPILE_ZLIB is disabled.
-}
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#endif /*LODEPNG_COMPILE_ZLIB*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
-/*this is a good tradeoff between speed and compression ratio*/
-#define DEFAULT_WINDOWSIZE 2048
-
-void LodePNG_CompressSettings_init(LodePNG_CompressSettings* settings)
-{
- /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/
- settings->btype = 2;
- settings->useLZ77 = 1;
- settings->windowSize = DEFAULT_WINDOWSIZE;
-}
-
-const LodePNG_CompressSettings LodePNG_defaultCompressSettings = {2, 1, DEFAULT_WINDOWSIZE};
-
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-void LodePNG_DecompressSettings_init(LodePNG_DecompressSettings* settings)
-{
- settings->ignoreAdler32 = 0;
-}
-
-const LodePNG_DecompressSettings LodePNG_defaultDecompressSettings = {0};
-
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* // End of Zlib related code. Begin of PNG related code. // */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_PNG
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / CRC32 / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-static unsigned Crc32_crc_table_computed = 0;
-static unsigned Crc32_crc_table[256];
-
-/*Make the table for a fast CRC.*/
-static void Crc32_make_crc_table(void)
-{
- unsigned c, k, n;
- for(n = 0; n < 256; n++)
- {
- c = n;
- for(k = 0; k < 8; k++)
- {
- if(c & 1) c = 0xedb88320L ^ (c >> 1);
- else c = c >> 1;
- }
- Crc32_crc_table[n] = c;
- }
- Crc32_crc_table_computed = 1;
-}
-
-/*Update a running CRC with the bytes buf[0..len-1]--the CRC should be
-initialized to all 1's, and the transmitted value is the 1's complement of the
-final running CRC (see the crc() routine below).*/
-static unsigned Crc32_update_crc(const unsigned char* buf, unsigned crc, size_t len)
-{
- unsigned c = crc;
- size_t n;
-
- if(!Crc32_crc_table_computed) Crc32_make_crc_table();
- for(n = 0; n < len; n++)
- {
- c = Crc32_crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
- }
- return c;
-}
-
-/*Return the CRC of the bytes buf[0..len-1].*/
-static unsigned Crc32_crc(const unsigned char* buf, size_t len)
-{
- return Crc32_update_crc(buf, 0xffffffffL, len) ^ 0xffffffffL;
-}
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Reading and writing single bits and bytes from/to stream for LodePNG / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream)
-{
- unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1);
- (*bitpointer)++;
- return result;
-}
-
-static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits)
-{
- unsigned result = 0;
- size_t i;
- for(i = nbits - 1; i < nbits; i--)
- {
- result += (unsigned)readBitFromReversedStream(bitpointer, bitstream) << i;
- }
- return result;
-}
-
-#ifdef LODEPNG_COMPILE_DECODER
-static void setBitOfReversedStream0(size_t* bitpointer, unsigned char* bitstream, unsigned char bit)
-{
- /*the current bit in bitstream must be 0 for this to work*/
- if(bit)
- {
- /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/
- bitstream[(*bitpointer) >> 3] |= (bit << (7 - ((*bitpointer) & 0x7)));
- }
- (*bitpointer)++;
-}
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit)
-{
- /*the current bit in bitstream may be 0 or 1 for this to work*/
- if(bit == 0) bitstream[(*bitpointer) >> 3] &= (unsigned char)(~(1 << (7 - ((*bitpointer) & 0x7))));
- else bitstream[(*bitpointer) >> 3] |= (1 << (7 - ((*bitpointer) & 0x7)));
- (*bitpointer)++;
-}
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / PNG chunks / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-unsigned LodePNG_chunk_length(const unsigned char* chunk)
-{
- return LodePNG_read32bitInt(&chunk[0]);
-}
-
-void LodePNG_chunk_type(char type[5], const unsigned char* chunk)
-{
- unsigned i;
- for(i = 0; i < 4; i++) type[i] = chunk[4 + i];
- type[4] = 0; /*null termination char*/
-}
-
-unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type)
-{
- if(strlen(type) != 4) return 0;
- return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]);
-}
-
-unsigned char LodePNG_chunk_critical(const unsigned char* chunk)
-{
- return((chunk[4] & 32) == 0);
-}
-
-unsigned char LodePNG_chunk_private(const unsigned char* chunk)
-{
- return((chunk[6] & 32) != 0);
-}
-
-unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk)
-{
- return((chunk[7] & 32) != 0);
-}
-
-unsigned char* LodePNG_chunk_data(unsigned char* chunk)
-{
- return &chunk[8];
-}
-
-const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk)
-{
- return &chunk[8];
-}
-
-unsigned LodePNG_chunk_check_crc(const unsigned char* chunk)
-{
- unsigned length = LodePNG_chunk_length(chunk);
- unsigned CRC = LodePNG_read32bitInt(&chunk[length + 8]);
- /*the CRC is taken of the data and the 4 chunk type letters, not the length*/
- unsigned checksum = Crc32_crc(&chunk[4], length + 4);
- if(CRC != checksum) return 1;
- else return 0;
-}
-
-void LodePNG_chunk_generate_crc(unsigned char* chunk)
-{
- unsigned length = LodePNG_chunk_length(chunk);
- unsigned CRC = Crc32_crc(&chunk[4], length + 4);
- LodePNG_set32bitInt(chunk + 8 + length, CRC);
-}
-
-unsigned char* LodePNG_chunk_next(unsigned char* chunk)
-{
- unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12;
- return &chunk[total_chunk_length];
-}
-
-const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk)
-{
- unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12;
- return &chunk[total_chunk_length];
-}
-
-unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk)
-{
- unsigned i;
- unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12;
- unsigned char *chunk_start, *new_buffer;
- size_t new_length = (*outlength) + total_chunk_length;
- if(new_length < total_chunk_length || new_length < (*outlength)) return 77; /*integer overflow happened*/
-
- new_buffer = (unsigned char*)realloc(*out, new_length);
- if(!new_buffer) return 9929; /*alloc fail*/
- (*out) = new_buffer;
- (*outlength) = new_length;
- chunk_start = &(*out)[new_length - total_chunk_length];
-
- for(i = 0; i < total_chunk_length; i++) chunk_start[i] = chunk[i];
-
- return 0;
-}
-
-unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length,
- const char* type, const unsigned char* data)
-{
- unsigned i;
- unsigned char *chunk, *new_buffer;
- size_t new_length = (*outlength) + length + 12;
- if(new_length < length + 12 || new_length < (*outlength)) return 77; /*integer overflow happened*/
- new_buffer = (unsigned char*)realloc(*out, new_length);
- if(!new_buffer) return 9930; /*alloc fail*/
- (*out) = new_buffer;
- (*outlength) = new_length;
- chunk = &(*out)[(*outlength) - length - 12];
-
- /*1: length*/
- LodePNG_set32bitInt(chunk, (unsigned)length);
-
- /*2: chunk name (4 letters)*/
- chunk[4] = type[0];
- chunk[5] = type[1];
- chunk[6] = type[2];
- chunk[7] = type[3];
-
- /*3: the data*/
- for(i = 0; i < length; i++) chunk[8 + i] = data[i];
-
- /*4: CRC (of the chunkname characters and the data)*/
- LodePNG_chunk_generate_crc(chunk);
-
- return 0;
-}
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / Color types and such / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*return type is a LodePNG error code*/
-static unsigned checkColorValidity(unsigned colorType, unsigned bd) /*bd = bitDepth*/
-{
- switch(colorType)
- {
- case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/
- case 2: if(!( bd == 8 || bd == 16)) return 37; break; /*RGB*/
- case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; /*palette*/
- case 4: if(!( bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/
- case 6: if(!( bd == 8 || bd == 16)) return 37; break; /*RGBA*/
- default: return 31;
- }
- return 0; /*allowed color type / bits combination*/
-}
-
-static unsigned getNumColorChannels(unsigned colorType)
-{
- switch(colorType)
- {
- case 0: return 1; /*grey*/
- case 2: return 3; /*RGB*/
- case 3: return 1; /*palette*/
- case 4: return 2; /*grey + alpha*/
- case 6: return 4; /*RGBA*/
- }
- return 0; /*unexisting color type*/
-}
-
-static unsigned getBpp(unsigned colorType, unsigned bitDepth)
-{
- /*bits per pixel is amount of channels * bits per channel*/
- return getNumColorChannels(colorType) * bitDepth;
-}
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-void LodePNG_InfoColor_init(LodePNG_InfoColor* info)
-{
- info->key_defined = 0;
- info->key_r = info->key_g = info->key_b = 0;
- info->colorType = 6;
- info->bitDepth = 8;
- info->palette = 0;
- info->palettesize = 0;
-}
-
-void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info)
-{
- LodePNG_InfoColor_clearPalette(info);
-}
-
-void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info)
-{
- if(info->palette) free(info->palette);
- info->palettesize = 0;
-}
-
-unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info,
- unsigned char r, unsigned char g, unsigned char b, unsigned char a)
-{
- unsigned char* data;
- /*the same resize technique as C++ std::vectors is used, and here it's made so that for a palette with
- the max of 256 colors, it'll have the exact alloc size*/
- if(!(info->palettesize & (info->palettesize - 1))) /*if palettesize is 0 or a power of two*/
- {
- /*allocated data must be at least 4* palettesize (for 4 color bytes)*/
- size_t alloc_size = info->palettesize == 0 ? 4 : info->palettesize * 4 * 2;
- data = (unsigned char*)realloc(info->palette, alloc_size);
- if(!data) return 9931; /*alloc fail*/
- else info->palette = data;
- }
- info->palette[4 * info->palettesize + 0] = r;
- info->palette[4 * info->palettesize + 1] = g;
- info->palette[4 * info->palettesize + 2] = b;
- info->palette[4 * info->palettesize + 3] = a;
- info->palettesize++;
- return 0;
-}
-
-unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info)
-{
- /*calculate bits per pixel out of colorType and bitDepth*/
- return getBpp(info->colorType, info->bitDepth);
-}
-
-unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info)
-{
- return getNumColorChannels(info->colorType);
-}
-
-unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info)
-{
- return info->colorType == 0 || info->colorType == 4;
-}
-
-unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info)
-{
- return (info->colorType & 4) != 0;
-}
-
-unsigned LodePNG_InfoColor_isPaletteType(const LodePNG_InfoColor* info)
-{
- return info->colorType == 3;
-}
-
-unsigned LodePNG_InfoColor_hasPaletteAlpha(const LodePNG_InfoColor* info)
-{
- size_t i;
- for(i = 0; i < info->palettesize; i++)
- {
- if(info->palette[i * 4 + 3] < 255) return 1;
- }
- return 0;
-}
-
-unsigned LodePNG_InfoColor_canHaveAlpha(const LodePNG_InfoColor* info)
-{
- return info->key_defined
- || LodePNG_InfoColor_isAlphaType(info)
- || LodePNG_InfoColor_hasPaletteAlpha(info);
-}
-
-unsigned LodePNG_InfoColor_equal(const LodePNG_InfoColor* info1, const LodePNG_InfoColor* info2)
-{
- return info1->colorType == info2->colorType
- && info1->bitDepth == info2->bitDepth; /*palette and color key not compared*/
-}
-
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
-void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks)
-{
- unsigned i;
- for(i = 0; i < 3; i++) chunks->data[i] = 0;
- for(i = 0; i < 3; i++) chunks->datasize[i] = 0;
-}
-
-void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks)
-{
- unsigned i;
- for(i = 0; i < 3; i++) free(chunks->data[i]);
-}
-
-unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src)
-{
- unsigned i;
-
- LodePNG_UnknownChunks_cleanup(dest);
-
- for(i = 0; i < 3; i++)
- {
- size_t j;
- dest->datasize[i] = src->datasize[i];
- dest->data[i] = (unsigned char*)malloc(src->datasize[i]);
- if(!dest->data[i] && dest->datasize[i]) return 9932; /*alloc fail*/
- for(j = 0; j < src->datasize[i]; j++) dest->data[i][j] = src->data[i][j];
- }
-
- return 0;
-}
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
-void LodePNG_Text_init(LodePNG_Text* text)
-{
- text->num = 0;
- text->keys = NULL;
- text->strings = NULL;
-}
-
-void LodePNG_Text_cleanup(LodePNG_Text* text)
-{
- LodePNG_Text_clear(text);
-}
-
-unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source)
-{
- size_t i = 0;
- dest->keys = 0;
- dest->strings = 0;
- dest->num = 0;
- for(i = 0; i < source->num; i++)
- {
- unsigned error = LodePNG_Text_add(dest, source->keys[i], source->strings[i]);
- if(error) return error;
- }
- return 0;
-}
-
-void LodePNG_Text_clear(LodePNG_Text* text)
-{
- size_t i;
- for(i = 0; i < text->num; i++)
- {
- string_cleanup(&text->keys[i]);
- string_cleanup(&text->strings[i]);
- }
- free(text->keys);
- free(text->strings);
-}
-
-unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str)
-{
- char** new_keys = (char**)(realloc(text->keys, sizeof(char*) * (text->num + 1)));
- char** new_strings = (char**)(realloc(text->strings, sizeof(char*) * (text->num + 1)));
- if(!new_keys || !new_strings)
- {
- free(new_keys);
- free(new_strings);
- return 9933; /*alloc fail*/
- }
-
- text->num++;
- text->keys = new_keys;
- text->strings = new_strings;
-
- string_init(&text->keys[text->num - 1]);
- string_set(&text->keys[text->num - 1], key);
-
- string_init(&text->strings[text->num - 1]);
- string_set(&text->strings[text->num - 1], str);
-
- return 0;
-}
-
-/******************************************************************************/
-
-void LodePNG_IText_init(LodePNG_IText* text)
-{
- text->num = 0;
- text->keys = NULL;
- text->langtags = NULL;
- text->transkeys = NULL;
- text->strings = NULL;
-}
-
-void LodePNG_IText_cleanup(LodePNG_IText* text)
-{
- LodePNG_IText_clear(text);
-}
-
-unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source)
-{
- size_t i = 0;
- dest->keys = 0;
- dest->langtags = 0;
- dest->transkeys = 0;
- dest->strings = 0;
- dest->num = 0;
- for(i = 0; i < source->num; i++)
- {
- unsigned error = LodePNG_IText_add(dest, source->keys[i], source->langtags[i],
- source->transkeys[i], source->strings[i]);
- if(error) return error;
- }
- return 0;
-}
-
-void LodePNG_IText_clear(LodePNG_IText* text)
-{
- size_t i;
- for(i = 0; i < text->num; i++)
- {
- string_cleanup(&text->keys[i]);
- string_cleanup(&text->langtags[i]);
- string_cleanup(&text->transkeys[i]);
- string_cleanup(&text->strings[i]);
- }
- free(text->keys);
- free(text->langtags);
- free(text->transkeys);
- free(text->strings);
-}
-
-unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag,
- const char* transkey, const char* str)
-{
- char** new_keys = (char**)(realloc(text->keys, sizeof(char*) * (text->num + 1)));
- char** new_langtags = (char**)(realloc(text->langtags, sizeof(char*) * (text->num + 1)));
- char** new_transkeys = (char**)(realloc(text->transkeys, sizeof(char*) * (text->num + 1)));
- char** new_strings = (char**)(realloc(text->strings, sizeof(char*) * (text->num + 1)));
- if(!new_keys || !new_langtags || !new_transkeys || !new_strings)
- {
- free(new_keys);
- free(new_langtags);
- free(new_transkeys);
- free(new_strings);
- return 9934; /*alloc fail*/
- }
-
- text->num++;
- text->keys = new_keys;
- text->langtags = new_langtags;
- text->transkeys = new_transkeys;
- text->strings = new_strings;
-
- string_init(&text->keys[text->num - 1]);
- string_set(&text->keys[text->num - 1], key);
-
- string_init(&text->langtags[text->num - 1]);
- string_set(&text->langtags[text->num - 1], langtag);
-
- string_init(&text->transkeys[text->num - 1]);
- string_set(&text->transkeys[text->num - 1], transkey);
-
- string_init(&text->strings[text->num - 1]);
- string_set(&text->strings[text->num - 1], str);
-
- return 0;
-}
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
-void LodePNG_InfoPng_init(LodePNG_InfoPng* info)
-{
- info->width = info->height = 0;
- LodePNG_InfoColor_init(&info->color);
- info->interlaceMethod = 0;
- info->compressionMethod = 0;
- info->filterMethod = 0;
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- info->background_defined = 0;
- info->background_r = info->background_g = info->background_b = 0;
-
- LodePNG_Text_init(&info->text);
- LodePNG_IText_init(&info->itext);
-
- info->time_defined = 0;
- info->phys_defined = 0;
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- LodePNG_UnknownChunks_init(&info->unknown_chunks);
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-}
-
-void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info)
-{
- LodePNG_InfoColor_cleanup(&info->color);
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- LodePNG_Text_cleanup(&info->text);
- LodePNG_IText_cleanup(&info->itext);
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- LodePNG_UnknownChunks_cleanup(&info->unknown_chunks);
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-}
-
-unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source)
-{
- unsigned error = 0;
- LodePNG_InfoPng_cleanup(dest);
- *dest = *source;
- LodePNG_InfoColor_init(&dest->color);
- error = LodePNG_InfoColor_copy(&dest->color, &source->color); if(error) return error;
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- error = LodePNG_Text_copy(&dest->text, &source->text); if(error) return error;
- error = LodePNG_IText_copy(&dest->itext, &source->itext); if(error) return error;
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- LodePNG_UnknownChunks_init(&dest->unknown_chunks);
- error = LodePNG_UnknownChunks_copy(&dest->unknown_chunks, &source->unknown_chunks); if(error) return error;
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- return error;
-}
-
-void LodePNG_InfoPng_swap(LodePNG_InfoPng* a, LodePNG_InfoPng* b)
-{
- LodePNG_InfoPng temp = *a;
- *a = *b;
- *b = temp;
-}
-
-unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source)
-{
- size_t i;
- LodePNG_InfoColor_cleanup(dest);
- *dest = *source;
- dest->palette = (unsigned char*)malloc(source->palettesize * 4);
- if(!dest->palette && source->palettesize) return 9935; /*alloc fail*/
- for(i = 0; i < source->palettesize * 4; i++) dest->palette[i] = source->palette[i];
- return 0;
-}
-
-void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info)
-{
- LodePNG_InfoColor_init(&info->color);
-}
-
-void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info)
-{
- LodePNG_InfoColor_cleanup(&info->color);
-}
-
-unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source)
-{
- unsigned error = 0;
- LodePNG_InfoRaw_cleanup(dest);
- *dest = *source;
- LodePNG_InfoColor_init(&dest->color);
- error = LodePNG_InfoColor_copy(&dest->color, &source->color);
- return error; /*this variable could be removed, but it's more clear what is returned this way*/
-}
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*convert from any color type to RGB or RGBA with 8 bits per sample*/
-static unsigned LodePNG_convert_rgb_a_8(unsigned char* out, const unsigned char* in,
- LodePNG_InfoColor* infoIn, size_t numpixels, unsigned bytes, unsigned alpha)
-{
- size_t i, c, bp = 0; /*bp = bitpointer, used by less-than-8-bit color types*/
-
- if(infoIn->bitDepth == 8)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 1] = out[bytes * i + 2] = in[i];
- if(alpha) out[bytes * i + 3] = infoIn->key_defined && in[i] == infoIn->key_r ? 0 : 255;
- }
- break;
- case 2: /*RGB color*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < 3; c++) out[bytes * i + c] = in[3 * i + c];
- if(alpha)
- {
- if(infoIn->key_defined == 1 && in[3 * i + 0] == infoIn->key_r
- && in[3 * i + 1] == infoIn->key_g && in[3 * i + 2] == infoIn->key_b)
- out[bytes * i + 3] = 0;
- else out[bytes * i + 3] = 255;
- }
- }
- break;
- case 3: /*indexed color (palette)*/
- for(i = 0; i < numpixels; i++)
- {
- if(in[i] >= infoIn->palettesize) return 46; /*invalid palette index*/
- for(c = 0; c < bytes; c++) out[bytes * i + c] = infoIn->palette[4 * in[i] + c];
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 1] = out[bytes * i + 2] = in[2 * i + 0];
- if(alpha) out[bytes * i + 3] = in[2 * i + 1];
- }
- break;
- case 6: /*RGB with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < bytes; c++) out[bytes * i + c] = in[4 * i + c];
- }
- break;
- default: break;
- }
- }
- else if(infoIn->bitDepth == 16)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 1] = out[bytes * i + 2] = in[2 * i];
- if(alpha) out[bytes * i + 3] = infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r ? 0 : 255;
- }
- break;
- case 2: /*RGB color*/
- for(i = 0; i < numpixels; i++)
- {
- if(alpha) out[bytes * i + 3] = 255;
- for(c = 0; c < 3; c++) out[bytes * i + c] = in[6 * i + 2 * c];
- if(alpha)
- {
- if(infoIn->key_defined && 256U * in[6 * i + 0] + in[6 * i + 1] == infoIn->key_r
- && 256U * in[6 * i + 2] + in[6 * i + 3] == infoIn->key_g
- && 256U * in[6 * i + 4] + in[6 * i + 5] == infoIn->key_b)
- out[bytes * i + 3] = 0;
- else out[bytes * i + 3] = 255;
- }
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 1] = out[bytes * i + 2] = in[4 * i];
- if(alpha) out[bytes * i + 3] = in[4 * i + 2];
- }
- break;
- case 6: /*RGB with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < bytes; c++) out[bytes * i + c] = in[8 * i + 2 * c];
- }
- break;
- default: break;
- }
- }
- else /*infoIn->bitDepth is less than 8 bit per channel*/
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth);
- unsigned highest = ((1U << infoIn->bitDepth) - 1U); /*highest possible value for this bit depth*/
- /*scale value from 0 to 255*/
- out[bytes * i + 0] = out[bytes * i + 1] = out[bytes * i + 2]
- = (unsigned char)((value * 255) / highest);
- if(alpha) out[bytes * i + 3] = infoIn->key_defined && value == infoIn->key_r ? 0 : 255;
- }
- break;
- case 3: /*indexed color (palette)*/
- for(i = 0; i < numpixels; i++)
- {
- unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth);
- if(value >= infoIn->palettesize) return 47;
- for(c = 0; c < bytes; c++) out[bytes * i + c] = infoIn->palette[4 * value + c];
- }
- break;
- default: break;
- }
- }
- return 0;
-}
-
-/*convert from any greyscale color type to 8-bit greyscale with or without alpha channel*/
-static unsigned LodePNG_convert_grey_8(unsigned char* out, const unsigned char* in,
- LodePNG_InfoColor* infoIn, size_t numpixels, unsigned bytes, unsigned alpha)
-{
- size_t i, bp = 0; /*bp = bitpointer, used by less-than-8-bit color types*/
-
- if(infoIn->bitDepth == 8)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i] = in[i];
- if(alpha) out[bytes * i + 1] = infoIn->key_defined && in[i] == infoIn->key_r ? 0 : 255;
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = in[2 * i + 0];
- if(alpha) out[bytes * i + 1] = in[2 * i + 1];
- }
- break;
- default: return 31;
- }
- }
- else if(infoIn->bitDepth == 16)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- if(alpha) out[bytes * i + 1] = 255;
- out[bytes * i] = in[2 * i];
- if(alpha && infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r)
- {
- out[bytes * i + 1] = 0;
- }
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i] = in[4 * i]; /*most significant byte*/
- if(alpha) out[bytes * i + 1] = in[4 * i + 2]; /*most significant byte*/
- }
- break;
- default: return 31;
- }
- }
- else /*infoIn->bitDepth is less than 8 bit per channel*/
- {
- if(infoIn->colorType != 0) return 31; /*colorType 0 is the only greyscale type with < 8 bits per channel*/
- for(i = 0; i < numpixels; i++)
- {
- unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth);
- unsigned highest = ((1U << infoIn->bitDepth) - 1U); /*highest possible value for this bit depth*/
- out[bytes * i] = (unsigned char)((value * 255) / highest); /*scale value from 0 to 255*/
- if(alpha)
- {
- if(infoIn->key_defined && value == infoIn->key_r) out[bytes * i + 1] = 0;
- else out[bytes * i + 1] = 255;
- }
- }
- }
- return 0;
-}
-
-/*convert from any color type to RGB or RGBA with 8 bits per sample*/
-static unsigned LodePNG_convert_rgb_a_16(unsigned char* out, const unsigned char* in,
- LodePNG_InfoColor* infoIn, size_t numpixels, unsigned bytes, unsigned alpha)
-{
- size_t i, c, bp = 0; /*bp = bitpointer, used by less-than-8-bit color types*/
-
- if(infoIn->bitDepth == 8)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 2] = out[bytes * i + 4] = in[i];
- out[bytes * i + 1] = out[bytes * i + 3] = out[bytes * i + 5] = in[i];
- if(alpha)
- {
- if(alpha && infoIn->key_defined && in[i] == infoIn->key_r) out[bytes * i + 6] = out[bytes * i + 7] = 0;
- else out[bytes * i + 6] = out[bytes * i + 7] = 255;
- }
- }
- break;
- case 2: /*RGB color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 1] = in[3 * i + 0];
- out[bytes * i + 2] = out[bytes * i + 3] = in[3 * i + 1];
- out[bytes * i + 4] = out[bytes * i + 5] = in[3 * i + 2];
- if(alpha)
- {
- if(infoIn->key_defined == 1 && in[3 * i + 0] == infoIn->key_r
- && in[3 * i + 1] == infoIn->key_g && in[3 * i + 2] == infoIn->key_b)
- out[bytes * i + 6] = out[bytes * i + 7] = 0;
- else out[bytes * i + 6] = out[bytes * i + 7] = 255;
- }
- }
- break;
- case 3: /*indexed color (palette)*/
- for(i = 0; i < numpixels; i++)
- {
- if(in[i] >= infoIn->palettesize) return 46; /*invalid palette index*/
- for(c = 0; c < bytes; c++)
- {
- out[bytes * i + 2 * c] = out[bytes * i + 2 * c + 1] = infoIn->palette[4 * in[i] + c];
- }
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 2] = out[bytes * i + 4] = in[i];
- out[bytes * i + 1] = out[bytes * i + 3] = out[bytes * i + 5] = in[i];
- if(alpha)
- {
- out[bytes * i + 6] = out[bytes * i + 7] = in[2 * i + 1];
- }
- }
- break;
- case 6: /*RGB with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < 3; c++)
- {
- out[bytes * i + 2 * c] = out[bytes * i + 2 * c + 1] = in[4 * i + c];
- }
- if(alpha)
- {
- out[bytes * i + 6] = out[bytes * i + 7] = in[4 * i + c];
- }
- }
- break;
- default: break;
- }
- }
- else if(infoIn->bitDepth == 16)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 2] = out[bytes * i + 4] = in[2 * i];
- out[bytes * i + 1] = out[bytes * i + 3] = out[bytes * i + 5] = in[2 * i + 1];
- if(alpha)
- {
- if(infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r)
- out[bytes * i + 6] = out[bytes * i + 7] = 0;
- else out[bytes * i + 6] = out[bytes * i + 7] = 255;
- }
- }
- break;
- case 2: /*RGB color*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < 6; c++) out[bytes * i + c] = in[6 * i + c];
- if(alpha)
- {
- if(infoIn->key_defined && 256U * in[6 * i + 0] + in[6 * i + 1] == infoIn->key_r
- && 256U * in[6 * i + 2] + in[6 * i + 3] == infoIn->key_g
- && 256U * in[6 * i + 4] + in[6 * i + 5] == infoIn->key_b)
- out[bytes * i + 6] = out[bytes * i + 7] = 0;
- else out[bytes * i + 6] = out[bytes * i + 7] = 255;
- }
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 2] = out[bytes * i + 4] = in[4 * i + 0];
- out[bytes * i + 1] = out[bytes * i + 3] = out[bytes * i + 5] = in[4 * i + 1];
- if(alpha)
- {
- out[bytes * i + 6] = in[4 * i + 2];
- out[bytes * i + 7] = in[4 * i + 3];
- }
- }
- break;
- case 6: /*RGB with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < bytes; c++) out[bytes * i + c] = in[8 * i + 2 * c];
- }
- break;
- default: break;
- }
- }
- else /*infoIn->bitDepth is less than 8 bit per channel*/
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth);
- unsigned highest = ((1U << infoIn->bitDepth) - 1U); /*highest possible value for this bit depth*/
- /*scale value from 0 to 255*/
- out[bytes * i + 0] = out[bytes * i + 2] = out[bytes * i + 4]
- = out[bytes * i + 1] = out[bytes * i + 3]
- = out[bytes * i + 5] = (unsigned char)((value * 255) / highest);
- if(alpha)
- {
- if(infoIn->key_defined && value == infoIn->key_r) out[bytes * i + 6] = out[bytes * i + 7] = 0;
- else out[bytes * i + 6] = out[bytes * i + 7] = 255;
- }
- }
- break;
- case 3: /*indexed color (palette)*/
- for(i = 0; i < numpixels; i++)
- {
- unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth);
- if(value >= infoIn->palettesize) return 47;
- for(c = 0; c < bytes / 2; c++)
- {
- out[bytes * i + c * 2 + 0] = out[bytes * i + c * 2 + 1] = infoIn->palette[4 * value + c];
- }
- }
- break;
- default: break;
- }
- }
- return 0;
-}
-
-/*convert from any greyscale color type to 16-bit greyscale with or without alpha channel*/
-static unsigned LodePNG_convert_grey_16(unsigned char* out, const unsigned char* in,
- LodePNG_InfoColor* infoIn, size_t numpixels, unsigned bytes, unsigned alpha)
-{
- size_t i, c, bp = 0; /*bp = bitpointer, used by less-than-8-bit color types*/
-
- if(infoIn->bitDepth == 8)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i] = out[bytes * i + 1] = in[i];
- if(alpha)
- {
- if(infoIn->key_defined && in[i] == infoIn->key_r) out[bytes * i + 2] = out[bytes * i + 3] = 0;
- else out[bytes * i + 2] = out[bytes * i + 3] = 255;
- }
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = out[bytes * i + 1] = in[2 * i + 0];
- if(alpha) out[bytes * i + 2] = out[bytes * i + 3] = in[2 * i + 1];
- }
- break;
- default: return 31;
- }
- }
- else if(infoIn->bitDepth == 16)
- {
- switch(infoIn->colorType)
- {
- case 0: /*greyscale color*/
- for(i = 0; i < numpixels; i++)
- {
- out[bytes * i + 0] = in[2 * i + 0];
- out[bytes * i + 1] = in[2 * i + 1];
- if(alpha)
- {
- if(infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r)
- out[bytes * i + 2] = out[bytes * i + 3] = 0;
- else out[bytes * i + 2] = out[bytes * i + 3] = 255;
- }
- }
- break;
- case 4: /*greyscale with alpha*/
- for(i = 0; i < numpixels; i++)
- {
- for(c = 0; c < bytes; c++) out[bytes * i + c] = in[4 * i + c];
- }
- break;
- default: return 31;
- }
- }
- else /*infoIn->bitDepth is less than 8 bit per channel*/
- {
- if(infoIn->colorType != 0) return 31; /*colorType 0 is the only greyscale type with < 8 bits per channel*/
- for(i = 0; i < numpixels; i++)
- {
- unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth);
- unsigned highest = ((1U << infoIn->bitDepth) - 1U); /*highest possible value for this bit depth*/
- out[bytes * i] = out[bytes * i + 1] = (unsigned char)((value * 255) / highest); /*scale value from 0 to 255*/
- if(alpha)
- {
- if(infoIn->key_defined && value == infoIn->key_r) out[bytes * i + 2] = out[bytes * i + 3] = 0;
- else out[bytes * i + 2] = out[bytes * i + 3] = 255;
- }
- }
- }
- return 0;
-}
-
-/*
-converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code
-the out buffer must have (w * h * bpp + 7) / 8 bytes, where bpp is the bits per pixel of the output color type
-(LodePNG_InfoColor_getBpp) for < 8 bpp images, there may _not_ be padding bits at the end of scanlines.
-*/
-unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut,
- LodePNG_InfoColor* infoIn, unsigned w, unsigned h)
-{
- size_t numpixels = w * h; /*amount of pixels*/
- unsigned bytes = LodePNG_InfoColor_getBpp(infoOut) / 8; /*bytes per pixel in the output image*/
- unsigned alpha = LodePNG_InfoColor_isAlphaType(infoOut); /*use 8-bit alpha channel*/
-
- /*cases where in and out already have the same format*/
- if(LodePNG_InfoColor_equal(infoIn, infoOut))
- {
- size_t i;
- size_t size = (numpixels * LodePNG_InfoColor_getBpp(infoIn) + 7) / 8;
- for(i = 0; i < size; i++) out[i] = in[i];
- return 0;
- }
- else if((infoOut->colorType == 2 || infoOut->colorType == 6) && infoOut->bitDepth == 8)
- {
- LodePNG_convert_rgb_a_8(out, in, infoIn, numpixels, bytes, alpha);
- }
- else if(LodePNG_InfoColor_isGreyscaleType(infoOut) && infoOut->bitDepth == 8)
- {
- /*conversion from greyscale to greyscale*/
- if(!LodePNG_InfoColor_isGreyscaleType(infoIn)) return 62; /*converting from color to grey is not supported*/
- LodePNG_convert_grey_8(out, in, infoIn, numpixels, bytes, alpha);
- }
- else if((infoOut->colorType == 2 || infoOut->colorType == 6) && infoOut->bitDepth == 16)
- {
- LodePNG_convert_rgb_a_16(out, in, infoIn, numpixels, bytes, alpha);
- }
- else if(LodePNG_InfoColor_isGreyscaleType(infoOut) && infoOut->bitDepth == 16)
- {
- /*conversion from greyscale to greyscale*/
- if(!LodePNG_InfoColor_isGreyscaleType(infoIn)) return 62; /*converting from color to grey is not supported*/
- LodePNG_convert_grey_16(out, in, infoIn, numpixels, bytes, alpha);
- }
- else return 59; /*invalid color mode*/
- return 0;
-}
-
-/*
-Paeth predicter, used by PNG filter type 4
-The parameters are of type short, but should come from unsigned chars, the shorts
-are only needed to make the paeth calculation correct.
-*/
-static unsigned char paethPredictor(short a, short b, short c)
-{
- short pa = abs(b - c);
- short pb = abs(a - c);
- short pc = abs(a + b - c - c);
-
- /*short pc = a + b - c;
- short pa = abs(pc - a);
- short pb = abs(pc - b);
- pc = abs(pc - c);*/
-
- if(pa <= pb && pa <= pc) return (unsigned char)a;
- else if(pb <= pc) return (unsigned char)b;
- else return (unsigned char)c;
-}
-
-/*shared values used by multiple Adam7 related functions*/
-
-static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/
-static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/
-static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/
-static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/
-
-static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8],
- size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp)
-{
- /*the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass*/
- unsigned i;
-
- /*calculate width and height in pixels of each pass*/
- for(i = 0; i < 7; i++)
- {
- passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i];
- passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i];
- if(passw[i] == 0) passh[i] = 0;
- if(passh[i] == 0) passw[i] = 0;
- }
-
- filter_passstart[0] = padded_passstart[0] = passstart[0] = 0;
- for(i = 0; i < 7; i++)
- {
- /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/
- filter_passstart[i + 1] = filter_passstart[i]
- + ((passw[i] && passh[i]) ? passh[i] * (1 + (passw[i] * bpp + 7) / 8) : 0);
- /*bits padded if needed to fill full byte at end of each scanline*/
- padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7) / 8);
- /*only padded at end of reduced image*/
- passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7) / 8;
- }
-}
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / PNG Decoder / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*read the information from the header and store it in the LodePNG_Info. return value is error*/
-void LodePNG_Decoder_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t inlength)
-{
- if(inlength == 0 || in == 0)
- {
- decoder->error = 48; /*the given data is empty*/
- return;
- }
- if(inlength < 29)
- {
- decoder->error = 27; /*error: the data length is smaller than the length of a PNG header*/
- return;
- }
-
- /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/
- LodePNG_InfoPng_cleanup(&decoder->infoPng);
- LodePNG_InfoPng_init(&decoder->infoPng);
- decoder->error = 0;
-
- if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71
- || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10)
- {
- decoder->error = 28; /*error: the first 8 bytes are not the correct PNG signature*/
- return;
- }
- if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R')
- {
- decoder->error = 29; /*error: it doesn't start with a IHDR chunk!*/
- return;
- }
-
- /*read the values given in the header*/
- decoder->infoPng.width = LodePNG_read32bitInt(&in[16]);
- decoder->infoPng.height = LodePNG_read32bitInt(&in[20]);
- decoder->infoPng.color.bitDepth = in[24];
- decoder->infoPng.color.colorType = in[25];
- decoder->infoPng.compressionMethod = in[26];
- decoder->infoPng.filterMethod = in[27];
- decoder->infoPng.interlaceMethod = in[28];
-
- if(!decoder->settings.ignoreCrc)
- {
- unsigned CRC = LodePNG_read32bitInt(&in[29]);
- unsigned checksum = Crc32_crc(&in[12], 17);
- if(CRC != checksum)
- {
- decoder->error = 57; /*invalid CRC*/
- return;
- }
- }
-
- /*error: only compression method 0 is allowed in the specification*/
- if(decoder->infoPng.compressionMethod != 0) { decoder->error = 32; return; }
- /*error: only filter method 0 is allowed in the specification*/
- if(decoder->infoPng.filterMethod != 0) { decoder->error = 33; return; }
- /*error: only interlace methods 0 and 1 exist in the specification*/
- if(decoder->infoPng.interlaceMethod > 1) { decoder->error = 34; return; }
-
- decoder->error = checkColorValidity(decoder->infoPng.color.colorType, decoder->infoPng.color.bitDepth);
-}
-
-static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon,
- size_t bytewidth, unsigned char filterType, size_t length)
-{
- /*
- For PNG filter method 0
- unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte,
- the filter works byte per byte (bytewidth = 1)
- precon is the previous unfiltered scanline, recon the result, scanline the current one
- the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead
- recon and scanline MAY be the same memory address! precon must be disjoint.
- */
-
- size_t i;
- switch(filterType)
- {
- case 0:
- for(i = 0; i < length; i++) recon[i] = scanline[i];
- break;
- case 1:
- for(i = 0; i < bytewidth; i++) recon[i] = scanline[i];
- for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth];
- break;
- case 2:
- if(precon)
- {
- for(i = 0; i < length; i++) recon[i] = scanline[i] + precon[i];
- }
- else
- {
- for(i = 0; i < length; i++) recon[i] = scanline[i];
- }
- break;
- case 3:
- if(precon)
- {
- for(i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2;
- for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2);
- }
- else
- {
- for(i = 0; i < bytewidth; i++) recon[i] = scanline[i];
- for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2;
- }
- break;
- case 4:
- if(precon)
- {
- for(i = 0; i < bytewidth; i++)
- {
- recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/
- }
- for(i = bytewidth; i < length; i++)
- {
- recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth]));
- }
- }
- else
- {
- for(i = 0; i < bytewidth; i++)
- {
- recon[i] = scanline[i];
- }
- for(i = bytewidth; i < length; i++)
- {
- /*paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth]*/
- recon[i] = (scanline[i] + recon[i - bytewidth]);
- }
- }
- break;
- default: return 36; /*error: unexisting filter type given*/
- }
- return 0;
-}
-
-static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp)
-{
- /*
- For PNG filter method 0
- this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times)
- out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline
- w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel
- in and out are allowed to be the same memory address (but aren't the same size since in has the extra filter bytes)
- */
-
- unsigned y;
- unsigned char* prevline = 0;
-
- /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/
- size_t bytewidth = (bpp + 7) / 8;
- size_t linebytes = (w * bpp + 7) / 8;
-
- for(y = 0; y < h; y++)
- {
- size_t outindex = linebytes * y;
- size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
- unsigned char filterType = in[inindex];
-
- unsigned error = unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes);
- if(error) return error;
-
- prevline = &out[outindex];
- }
-
- return 0;
-}
-
-static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp)
-{
- /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines
- with non-multiple-of-8 bit amounts, only between reduced images is padding
- out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation
- (because that's likely a little bit faster)*/
- unsigned passw[7], passh[7];
- size_t filter_passstart[8], padded_passstart[8], passstart[8];
- unsigned i;
-
- Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
-
- if(bpp >= 8)
- {
- for(i = 0; i < 7; i++)
- {
- unsigned x, y, b;
- size_t bytewidth = bpp / 8;
- for(y = 0; y < passh[i]; y++)
- for(x = 0; x < passw[i]; x++)
- {
- size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth;
- size_t pixeloutstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth;
- for(b = 0; b < bytewidth; b++)
- {
- out[pixeloutstart + b] = in[pixelinstart + b];
- }
- }
- }
- }
- else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/
- {
- for(i = 0; i < 7; i++)
- {
- unsigned x, y, b;
- unsigned ilinebits = bpp * passw[i];
- unsigned olinebits = bpp * w;
- size_t obp, ibp; /*bit pointers (for out and in buffer)*/
- for(y = 0; y < passh[i]; y++)
- for(x = 0; x < passw[i]; x++)
- {
- ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp);
- obp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp;
- for(b = 0; b < bpp; b++)
- {
- unsigned char bit = readBitFromReversedStream(&ibp, in);
- /*note that this function assumes the out buffer is completely 0, use setBitOfReversedStream otherwise*/
- setBitOfReversedStream0(&obp, out, bit);
- }
- }
- }
- }
-}
-
-static void removePaddingBits(unsigned char* out, const unsigned char* in,
- size_t olinebits, size_t ilinebits, unsigned h)
-{
- /*
- After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need
- to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers
- for the Adam7 code, the color convert code and the output to the user.
- in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must
- have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits
- also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7
- only useful if (ilinebits - olinebits) is a value in the range 1..7
- */
- unsigned y;
- size_t diff = ilinebits - olinebits;
- size_t ibp = 0, obp = 0; /*input and output bit pointers*/
- for(y = 0; y < h; y++)
- {
- size_t x;
- for(x = 0; x < olinebits; x++)
- {
- unsigned char bit = readBitFromReversedStream(&ibp, in);
- setBitOfReversedStream(&obp, out, bit);
- }
- ibp += diff;
- }
-}
-
-/*out must be buffer big enough to contain full image, and in must contain the full decompressed data from
-the IDAT chunks (with filter index bytes and possible padding bits)
-return value is error*/
-static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, const LodePNG_InfoPng* infoPng)
-{
- /*
- This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype.
- Steps:
- *) if no Adam7: 1) unfilter 2) remove padding bits (= posible extra bits per scanline if bpp < 8)
- *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace
- NOTE: the in buffer will be overwritten with intermediate data!
- */
- unsigned bpp = LodePNG_InfoColor_getBpp(&infoPng->color);
- unsigned w = infoPng->width;
- unsigned h = infoPng->height;
- unsigned error = 0;
- if(bpp == 0) return 31; /*error: invalid colortype*/
-
- if(infoPng->interlaceMethod == 0)
- {
- if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8)
- {
- error = unfilter(in, in, w, h, bpp);
- if(error) return error;
- removePaddingBits(out, in, w * bpp, ((w * bpp + 7) / 8) * 8, h);
- }
- else error = unfilter(out, in, w, h, bpp); /*we can immediatly filter into the out buffer, no other steps needed*/
- }
- else /*interlaceMethod is 1 (Adam7)*/
- {
- unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8];
- unsigned i;
-
- Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
-
- for(i = 0; i < 7; i++)
- {
- error = unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp);
- if(error) return error;
- /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline,
- move bytes instead of bits or move not at all*/
- if(bpp < 8)
- {
- /*remove padding bits in scanlines; after this there still may be padding
- bits between the different reduced images: each reduced image still starts nicely at a byte*/
- removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp,
- ((passw[i] * bpp + 7) / 8) * 8, passh[i]);
- }
- }
-
- Adam7_deinterlace(out, in, w, h, bpp);
- }
-
- return error;
-}
-
-/*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/
-static void decodeGeneric(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize,
- const unsigned char* in, size_t insize)
-{
- unsigned char IEND = 0;
- const unsigned char* chunk;
- size_t i;
- ucvector idat; /*the data from idat chunks*/
-
- /*for unknown chunk order*/
- unsigned unknown = 0;
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
- /*provide some proper output values if error will happen*/
- *out = 0;
- *outsize = 0;
-
- LodePNG_Decoder_inspect(decoder, in, insize); /*reads header and resets other parameters in decoder->infoPng*/
- if(decoder->error) return;
-
- ucvector_init(&idat);
-
- chunk = &in[33]; /*first byte of the first chunk after the header*/
-
- /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk.
- IDAT data is put at the start of the in buffer*/
- while(!IEND)
- {
- unsigned chunkLength;
- const unsigned char* data; /*the data in the chunk*/
-
- /*error: size of the in buffer too small to contain next chunk*/
- if((size_t)((chunk - in) + 12) > insize || chunk < in) CERROR_BREAK(decoder->error, 30);
-
- /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/
- chunkLength = LodePNG_chunk_length(chunk);
- /*error: chunk length larger than the max PNG chunk size*/
- if(chunkLength > 2147483647) CERROR_BREAK(decoder->error, 63);
-
- if((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in)
- {
- CERROR_BREAK(decoder->error, 64); /*error: size of the in buffer too small to contain next chunk*/
- }
-
- data = LodePNG_chunk_data_const(chunk);
-
- /*IDAT chunk, containing compressed image data*/
- if(LodePNG_chunk_type_equals(chunk, "IDAT"))
- {
- size_t oldsize = idat.size;
- if(!ucvector_resize(&idat, oldsize + chunkLength)) CERROR_BREAK(decoder->error, 9936 /*alloc fail*/);
- for(i = 0; i < chunkLength; i++) idat.data[oldsize + i] = data[i];
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- critical_pos = 3;
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- }
- /*IEND chunk*/
- else if(LodePNG_chunk_type_equals(chunk, "IEND"))
- {
- IEND = 1;
- }
- /*palette chunk (PLTE)*/
- else if(LodePNG_chunk_type_equals(chunk, "PLTE"))
- {
- unsigned pos = 0;
- if(decoder->infoPng.color.palette) free(decoder->infoPng.color.palette);
- decoder->infoPng.color.palettesize = chunkLength / 3;
- decoder->infoPng.color.palette = (unsigned char*)malloc(4 * decoder->infoPng.color.palettesize);
- if(!decoder->infoPng.color.palette && decoder->infoPng.color.palettesize)
- {
- decoder->infoPng.color.palettesize = 0;
- CERROR_BREAK(decoder->error, 9937); /*alloc fail*/
- }
- if(decoder->infoPng.color.palettesize > 256) CERROR_BREAK(decoder->error, 38); /*error: palette too big*/
-
- for(i = 0; i < decoder->infoPng.color.palettesize; i++)
- {
- decoder->infoPng.color.palette[4 * i + 0] = data[pos++]; /*R*/
- decoder->infoPng.color.palette[4 * i + 1] = data[pos++]; /*G*/
- decoder->infoPng.color.palette[4 * i + 2] = data[pos++]; /*B*/
- decoder->infoPng.color.palette[4 * i + 3] = 255; /*alpha*/
- }
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- critical_pos = 2;
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- }
- /*palette transparency chunk (tRNS)*/
- else if(LodePNG_chunk_type_equals(chunk, "tRNS"))
- {
- if(decoder->infoPng.color.colorType == 3)
- {
- /*error: more alpha values given than there are palette entries*/
- if(chunkLength > decoder->infoPng.color.palettesize) CERROR_BREAK(decoder->error, 38);
-
- for(i = 0; i < chunkLength; i++) decoder->infoPng.color.palette[4 * i + 3] = data[i];
- }
- else if(decoder->infoPng.color.colorType == 0)
- {
- /*error: this chunk must be 2 bytes for greyscale image*/
- if(chunkLength != 2) CERROR_BREAK(decoder->error, 30);
-
- decoder->infoPng.color.key_defined = 1;
- decoder->infoPng.color.key_r = decoder->infoPng.color.key_g
- = decoder->infoPng.color.key_b = 256 * data[0] + data[1];
- }
- else if(decoder->infoPng.color.colorType == 2)
- {
- /*error: this chunk must be 6 bytes for RGB image*/
- if(chunkLength != 6) CERROR_BREAK(decoder->error, 41);
-
- decoder->infoPng.color.key_defined = 1;
- decoder->infoPng.color.key_r = 256 * data[0] + data[1];
- decoder->infoPng.color.key_g = 256 * data[2] + data[3];
- decoder->infoPng.color.key_b = 256 * data[4] + data[5];
- }
- else CERROR_BREAK(decoder->error, 42); /*error: tRNS chunk not allowed for other color models*/
- }
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- /*background color chunk (bKGD)*/
- else if(LodePNG_chunk_type_equals(chunk, "bKGD"))
- {
- if(decoder->infoPng.color.colorType == 3)
- {
- /*error: this chunk must be 1 byte for indexed color image*/
- if(chunkLength != 1) CERROR_BREAK(decoder->error, 43);
-
- decoder->infoPng.background_defined = 1;
- decoder->infoPng.background_r = decoder->infoPng.background_g = decoder->infoPng.background_b = data[0];
- }
- else if(decoder->infoPng.color.colorType == 0 || decoder->infoPng.color.colorType == 4)
- {
- /*error: this chunk must be 2 bytes for greyscale image*/
- if(chunkLength != 2) CERROR_BREAK(decoder->error, 44);
-
- decoder->infoPng.background_defined = 1;
- decoder->infoPng.background_r = decoder->infoPng.background_g = decoder->infoPng.background_b
- = 256 * data[0] + data[1];
- }
- else if(decoder->infoPng.color.colorType == 2 || decoder->infoPng.color.colorType == 6)
- {
- /*error: this chunk must be 6 bytes for greyscale image*/
- if(chunkLength != 6) CERROR_BREAK(decoder->error, 45);
-
- decoder->infoPng.background_defined = 1;
- decoder->infoPng.background_r = 256 * data[0] + data[1];
- decoder->infoPng.background_g = 256 * data[2] + data[3];
- decoder->infoPng.background_b = 256 * data[4] + data[5];
- }
- }
- /*text chunk (tEXt)*/
- else if(LodePNG_chunk_type_equals(chunk, "tEXt"))
- {
- if(decoder->settings.readTextChunks)
- {
- char *key = 0, *str = 0;
-
- while(!decoder->error) /*not really a while loop, only used to break on error*/
- {
- unsigned length, string2_begin;
-
- length = 0;
- while(length < chunkLength && data[length] != 0) length++;
- /*error, end reached, no null terminator?*/
- if(length + 1 >= chunkLength) CERROR_BREAK(decoder->error, 75);
-
- key = (char*)malloc(length + 1);
- if(!key) CERROR_BREAK(decoder->error, 9938); /*alloc fail*/
-
- key[length] = 0;
- for(i = 0; i < length; i++) key[i] = data[i];
-
- string2_begin = length + 1;
- /*error, end reached, no null terminator?*/
- if(string2_begin > chunkLength) CERROR_BREAK(decoder->error, 75);
-
- length = chunkLength - string2_begin;
- str = (char*)malloc(length + 1);
- if(!str) CERROR_BREAK(decoder->error, 9939); /*alloc fail*/
-
- str[length] = 0;
- for(i = 0; i < length; i++) str[i] = data[string2_begin + i];
-
- decoder->error = LodePNG_Text_add(&decoder->infoPng.text, key, str);
-
- break;
- }
-
- free(key);
- free(str);
- }
- }
- /*compressed text chunk (zTXt)*/
- else if(LodePNG_chunk_type_equals(chunk, "zTXt"))
- {
- if(decoder->settings.readTextChunks)
- {
- unsigned length, string2_begin;
- char *key = 0;
- ucvector decoded;
-
- ucvector_init(&decoded);
-
- while(!decoder->error) /*not really a while loop, only used to break on error*/
- {
- for(length = 0; length < chunkLength && data[length] != 0; length++) ;
- if(length + 2 >= chunkLength) CERROR_BREAK(decoder->error, 75); /*no null termination, corrupt?*/
-
- key = (char*)malloc(length + 1);
- if(!key) CERROR_BREAK(decoder->error, 9940); /*alloc fail*/
-
- key[length] = 0;
- for(i = 0; i < length; i++) key[i] = data[i];
-
- if(data[length + 1] != 0) CERROR_BREAK(decoder->error, 72); /*the 0 byte indicating compression must be 0*/
-
- string2_begin = length + 2;
- if(string2_begin > chunkLength) CERROR_BREAK(decoder->error, 75); /*no null termination, corrupt?*/
-
- length = chunkLength - string2_begin;
- decoder->error = LodePNG_zlib_decompress(&decoded.data, &decoded.size,
- (unsigned char*)(&data[string2_begin]),
- length, &decoder->settings.zlibsettings);
- if(decoder->error) break;
- ucvector_push_back(&decoded, 0);
-
- decoder->error = LodePNG_Text_add(&decoder->infoPng.text, key, (char*)decoded.data);
-
- break;
- }
-
- free(key);
- ucvector_cleanup(&decoded);
- if(decoder->error) break;
- }
- }
- /*international text chunk (iTXt)*/
- else if(LodePNG_chunk_type_equals(chunk, "iTXt"))
- {
- if(decoder->settings.readTextChunks)
- {
- unsigned length, begin, compressed;
- char *key = 0, *langtag = 0, *transkey = 0;
- ucvector decoded;
- ucvector_init(&decoded);
-
- while(!decoder->error) /*not really a while loop, only used to break on error*/
- {
- /*Quick check if the chunk length isn't too small. Even without check
- it'd still fail with other error checks below if it's too short. This just gives a different error code.*/
- if(chunkLength < 5) CERROR_BREAK(decoder->error, 30); /*iTXt chunk too short*/
-
- /*read the key*/
- for(length = 0; length < chunkLength && data[length] != 0; length++) ;
- if(length + 2 >= chunkLength) CERROR_BREAK(decoder->error, 75); /*no null termination char found*/
-
- key = (char*)malloc(length + 1);
- if(!key) CERROR_BREAK(decoder->error, 9941); /*alloc fail*/
-
- key[length] = 0;
- for(i = 0; i < length; i++) key[i] = data[i];
-
- /*read the compression method*/
- compressed = data[length + 1];
- if(data[length + 2] != 0) CERROR_BREAK(decoder->error, 72); /*the 0 byte indicating compression must be 0*/
-
- /*read the langtag*/
- begin = length + 3;
- length = 0;
- for(i = begin; i < chunkLength && data[i] != 0; i++) length++;
- if(begin + length + 1 >= chunkLength) CERROR_BREAK(decoder->error, 75); /*no null termination char found*/
-
- langtag = (char*)malloc(length + 1);
- if(!langtag) CERROR_BREAK(decoder->error, 9942); /*alloc fail*/
-
- langtag[length] = 0;
- for(i = 0; i < length; i++) langtag[i] = data[begin + i];
-
- /*read the transkey*/
- begin += length + 1;
- length = 0;
- for(i = begin; i < chunkLength && data[i] != 0; i++) length++;
- if(begin + length + 1 >= chunkLength) CERROR_BREAK(decoder->error, 75); /*no null termination, corrupt?*/
-
- transkey = (char*)malloc(length + 1);
- if(!transkey) CERROR_BREAK(decoder->error, 9943); /*alloc fail*/
-
- transkey[length] = 0;
- for(i = 0; i < length; i++) transkey[i] = data[begin + i];
-
- /*read the actual text*/
- begin += length + 1;
- if(begin > chunkLength) CERROR_BREAK(decoder->error, 75); /*no null termination, corrupt?*/
-
- length = chunkLength - begin;
-
- if(compressed)
- {
- decoder->error = LodePNG_zlib_decompress(&decoded.data, &decoded.size,
- (unsigned char*)(&data[begin]),
- length, &decoder->settings.zlibsettings);
- if(decoder->error) break;
- ucvector_push_back(&decoded, 0);
- }
- else
- {
- if(!ucvector_resize(&decoded, length + 1)) CERROR_BREAK(decoder->error, 9944 /*alloc fail*/);
-
- decoded.data[length] = 0;
- for(i = 0; i < length; i++) decoded.data[i] = data[begin + i];
- }
-
- decoder->error = LodePNG_IText_add(&decoder->infoPng.itext, key, langtag, transkey, (char*)decoded.data);
-
- break;
- }
-
- free(key);
- free(langtag);
- free(transkey);
- ucvector_cleanup(&decoded);
- if(decoder->error) break;
- }
- }
- else if(LodePNG_chunk_type_equals(chunk, "tIME"))
- {
- if(chunkLength != 7) CERROR_BREAK(decoder->error, 73); /*invalid tIME chunk size*/
-
- decoder->infoPng.time_defined = 1;
- decoder->infoPng.time.year = 256 * data[0] + data[+ 1];
- decoder->infoPng.time.month = data[2];
- decoder->infoPng.time.day = data[3];
- decoder->infoPng.time.hour = data[4];
- decoder->infoPng.time.minute = data[5];
- decoder->infoPng.time.second = data[6];
- }
- else if(LodePNG_chunk_type_equals(chunk, "pHYs"))
- {
- if(chunkLength != 9) CERROR_BREAK(decoder->error, 74); /*invalid pHYs chunk size*/
-
- decoder->infoPng.phys_defined = 1;
- decoder->infoPng.phys_x = 16777216 * data[0] + 65536 * data[1] + 256 * data[2] + data[3];
- decoder->infoPng.phys_y = 16777216 * data[4] + 65536 * data[5] + 256 * data[6] + data[7];
- decoder->infoPng.phys_unit = data[8];
- }
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
- else /*it's not an implemented chunk type, so ignore it: skip over the data*/
- {
- /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/
- if(LodePNG_chunk_critical(chunk)) CERROR_BREAK(decoder->error, 69);
-
- unknown = 1;
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- if(decoder->settings.rememberUnknownChunks)
- {
- LodePNG_UnknownChunks* unknown = &decoder->infoPng.unknown_chunks;
- decoder->error = LodePNG_append_chunk(&unknown->data[critical_pos - 1],
- &unknown->datasize[critical_pos - 1], chunk);
- if(decoder->error) break;
- }
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- }
-
- if(!decoder->settings.ignoreCrc && !unknown) /*check CRC if wanted, only on known chunk types*/
- {
- if(LodePNG_chunk_check_crc(chunk)) CERROR_BREAK(decoder->error, 57); /*invalid CRC*/
- }
-
- if(!IEND) chunk = LodePNG_chunk_next_const(chunk);
- }
-
- if(!decoder->error)
- {
- ucvector scanlines;
- ucvector_init(&scanlines);
-
- /*maximum final image length is already reserved in the vector's length - this is not really necessary*/
- if(!ucvector_resize(&scanlines, ((decoder->infoPng.width * (decoder->infoPng.height
- * LodePNG_InfoColor_getBpp(&decoder->infoPng.color) + 7)) / 8) + decoder->infoPng.height))
- {
- decoder->error = 9945; /*alloc fail*/
- }
- if(!decoder->error)
- {
- /*decompress with the Zlib decompressor*/
- decoder->error = LodePNG_zlib_decompress(&scanlines.data, &scanlines.size, idat.data,
- idat.size, &decoder->settings.zlibsettings);
- }
-
- if(!decoder->error)
- {
- ucvector outv;
- ucvector_init(&outv);
- if(!ucvector_resizev(&outv, (decoder->infoPng.height * decoder->infoPng.width
- * LodePNG_InfoColor_getBpp(&decoder->infoPng.color) + 7) / 8, 0)) decoder->error = 9946; /*alloc fail*/
- if(!decoder->error) decoder->error = postProcessScanlines(outv.data, scanlines.data, &decoder->infoPng);
- *out = outv.data;
- *outsize = outv.size;
- }
- ucvector_cleanup(&scanlines);
- }
-
- ucvector_cleanup(&idat);
-}
-
-void LodePNG_Decoder_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize,
- const unsigned char* in, size_t insize)
-{
- *out = 0;
- *outsize = 0;
- decodeGeneric(decoder, out, outsize, in, insize);
- if(decoder->error) return;
- if(!decoder->settings.color_convert || LodePNG_InfoColor_equal(&decoder->infoRaw.color, &decoder->infoPng.color))
- {
- /*same color type, no copying or converting of data needed*/
- /*store the infoPng color settings on the infoRaw so that the infoRaw still reflects what colorType
- the raw image has to the end user*/
- if(!decoder->settings.color_convert)
- {
- decoder->error = LodePNG_InfoColor_copy(&decoder->infoRaw.color, &decoder->infoPng.color);
- if(decoder->error) return;
- }
- }
- else
- {
- /*color conversion needed; sort of copy of the data*/
- unsigned char* data = *out;
-
- /*TODO: check if this works according to the statement in the documentation: "The converter can convert
- from greyscale input color type, to 8-bit greyscale or greyscale with alpha"*/
- if(!(decoder->infoRaw.color.colorType == 2 || decoder->infoRaw.color.colorType == 6)
- && !(decoder->infoRaw.color.bitDepth == 8))
- {
- decoder->error = 56; /*unsupported color mode conversion*/
- return;
- }
-
- *outsize = (decoder->infoPng.width * decoder->infoPng.height
- * LodePNG_InfoColor_getBpp(&decoder->infoRaw.color) + 7) / 8;
- *out = (unsigned char*)malloc(*outsize);
- if(!(*out))
- {
- decoder->error = 9947; /*alloc fail*/
- *outsize = 0;
- }
- else decoder->error = LodePNG_convert(*out, data, &decoder->infoRaw.color, &decoder->infoPng.color,
- decoder->infoPng.width, decoder->infoPng.height);
- free(data);
- }
-}
-
-unsigned LodePNG_decode(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in,
- size_t insize, unsigned colorType, unsigned bitDepth)
-{
- unsigned error;
- size_t dummy_size;
- LodePNG_Decoder decoder;
- LodePNG_Decoder_init(&decoder);
- decoder.infoRaw.color.colorType = colorType;
- decoder.infoRaw.color.bitDepth = bitDepth;
- LodePNG_Decoder_decode(&decoder, out, &dummy_size, in, insize);
- error = decoder.error;
- *w = decoder.infoPng.width;
- *h = decoder.infoPng.height;
- LodePNG_Decoder_cleanup(&decoder);
- return error;
-}
-
-unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize)
-{
- return LodePNG_decode(out, w, h, in, insize, 6, 8);
-}
-
-unsigned LodePNG_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize)
-{
- return LodePNG_decode(out, w, h, in, insize, 2, 8);
-}
-
-#ifdef LODEPNG_COMPILE_DISK
-unsigned LodePNG_decode_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename,
- unsigned colorType, unsigned bitDepth)
-{
- unsigned char* buffer;
- size_t buffersize;
- unsigned error;
- error = LodePNG_loadFile(&buffer, &buffersize, filename);
- if(!error) error = LodePNG_decode(out, w, h, buffer, buffersize, colorType, bitDepth);
- free(buffer);
- return error;
-}
-
-unsigned LodePNG_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename)
-{
- return LodePNG_decode_file(out, w, h, filename, 6, 8);
-}
-
-unsigned LodePNG_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename)
-{
- return LodePNG_decode_file(out, w, h, filename, 2, 8);
-}
-#endif /*LODEPNG_COMPILE_DISK*/
-
-void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings)
-{
- settings->color_convert = 1;
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- settings->readTextChunks = 1;
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
- settings->ignoreCrc = 0;
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- settings->rememberUnknownChunks = 0;
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- LodePNG_DecompressSettings_init(&settings->zlibsettings);
-}
-
-void LodePNG_Decoder_init(LodePNG_Decoder* decoder)
-{
- LodePNG_DecodeSettings_init(&decoder->settings);
- LodePNG_InfoRaw_init(&decoder->infoRaw);
- LodePNG_InfoPng_init(&decoder->infoPng);
- decoder->error = 1;
-}
-
-void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder)
-{
- LodePNG_InfoRaw_cleanup(&decoder->infoRaw);
- LodePNG_InfoPng_cleanup(&decoder->infoPng);
-}
-
-void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source)
-{
- LodePNG_Decoder_cleanup(dest);
- *dest = *source;
- LodePNG_InfoRaw_init(&dest->infoRaw);
- LodePNG_InfoPng_init(&dest->infoPng);
- dest->error = LodePNG_InfoRaw_copy(&dest->infoRaw, &source->infoRaw); if(dest->error) return;
- dest->error = LodePNG_InfoPng_copy(&dest->infoPng, &source->infoPng); if(dest->error) return;
-}
-
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* / PNG Encoder / */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*chunkName must be string of 4 characters*/
-static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length)
-{
- unsigned error = LodePNG_create_chunk(&out->data, &out->size, (unsigned)length, chunkName, data);
- if(error) return error;
- out->allocsize = out->size; /*fix the allocsize again*/
- return 0;
-}
-
-static void writeSignature(ucvector* out)
-{
- /*8 bytes PNG signature, aka the magic bytes*/
- ucvector_push_back(out, 137);
- ucvector_push_back(out, 80);
- ucvector_push_back(out, 78);
- ucvector_push_back(out, 71);
- ucvector_push_back(out, 13);
- ucvector_push_back(out, 10);
- ucvector_push_back(out, 26);
- ucvector_push_back(out, 10);
-}
-
-static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h, unsigned bitDepth,
- unsigned colorType, unsigned interlaceMethod)
-{
- unsigned error = 0;
- ucvector header;
- ucvector_init(&header);
-
- LodePNG_add32bitInt(&header, w); /*width*/
- LodePNG_add32bitInt(&header, h); /*height*/
- ucvector_push_back(&header, (unsigned char)bitDepth); /*bit depth*/
- ucvector_push_back(&header, (unsigned char)colorType); /*color type*/
- ucvector_push_back(&header, 0); /*compression method*/
- ucvector_push_back(&header, 0); /*filter method*/
- ucvector_push_back(&header, interlaceMethod); /*interlace method*/
-
- error = addChunk(out, "IHDR", header.data, header.size);
- ucvector_cleanup(&header);
-
- return error;
-}
-
-static unsigned addChunk_PLTE(ucvector* out, const LodePNG_InfoColor* info)
-{
- unsigned error = 0;
- size_t i;
- ucvector PLTE;
- ucvector_init(&PLTE);
- for(i = 0; i < info->palettesize * 4; i++)
- {
- /*add all channels except alpha channel*/
- if(i % 4 != 3) ucvector_push_back(&PLTE, info->palette[i]);
- }
- error = addChunk(out, "PLTE", PLTE.data, PLTE.size);
- ucvector_cleanup(&PLTE);
-
- return error;
-}
-
-static unsigned addChunk_tRNS(ucvector* out, const LodePNG_InfoColor* info)
-{
- unsigned error = 0;
- size_t i;
- ucvector tRNS;
- ucvector_init(&tRNS);
- if(info->colorType == 3)
- {
- /*add only alpha channel*/
- for(i = 0; i < info->palettesize; i++) ucvector_push_back(&tRNS, info->palette[4 * i + 3]);
- }
- else if(info->colorType == 0)
- {
- if(info->key_defined)
- {
- ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256));
- ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256));
- }
- }
- else if(info->colorType == 2)
- {
- if(info->key_defined)
- {
- ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256));
- ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256));
- ucvector_push_back(&tRNS, (unsigned char)(info->key_g / 256));
- ucvector_push_back(&tRNS, (unsigned char)(info->key_g % 256));
- ucvector_push_back(&tRNS, (unsigned char)(info->key_b / 256));
- ucvector_push_back(&tRNS, (unsigned char)(info->key_b % 256));
- }
- }
-
- error = addChunk(out, "tRNS", tRNS.data, tRNS.size);
- ucvector_cleanup(&tRNS);
-
- return error;
-}
-
-static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize,
- LodePNG_CompressSettings* zlibsettings)
-{
- ucvector zlibdata;
- unsigned error = 0;
-
- /*compress with the Zlib compressor*/
- ucvector_init(&zlibdata);
- error = LodePNG_zlib_compress(&zlibdata.data, &zlibdata.size, data, datasize, zlibsettings);
- if(!error) error = addChunk(out, "IDAT", zlibdata.data, zlibdata.size);
- ucvector_cleanup(&zlibdata);
-
- return error;
-}
-
-static unsigned addChunk_IEND(ucvector* out)
-{
- unsigned error = 0;
- error = addChunk(out, "IEND", 0, 0);
- return error;
-}
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
-
-static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring)
-{
- unsigned error = 0;
- size_t i;
- ucvector text;
- ucvector_init(&text);
- for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&text, (unsigned char)keyword[i]);
- ucvector_push_back(&text, 0);
- for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&text, (unsigned char)textstring[i]);
- error = addChunk(out, "tEXt", text.data, text.size);
- ucvector_cleanup(&text);
-
- return error;
-}
-
-static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring,
- LodePNG_CompressSettings* zlibsettings)
-{
- unsigned error = 0;
- ucvector data, compressed;
- size_t i, textsize = strlen(textstring);
-
- ucvector_init(&data);
- ucvector_init(&compressed);
- for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]);
- ucvector_push_back(&data, 0); /* 0 termination char*/
- ucvector_push_back(&data, 0); /*compression method: 0*/
-
- error = LodePNG_zlib_compress(&compressed.data, &compressed.size,
- (unsigned char*)textstring, textsize, zlibsettings);
- if(!error)
- {
- for(i = 0; i < compressed.size; i++) ucvector_push_back(&data, compressed.data[i]);
- error = addChunk(out, "zTXt", data.data, data.size);
- }
-
- ucvector_cleanup(&compressed);
- ucvector_cleanup(&data);
- return error;
-}
-
-static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* keyword, const char* langtag,
- const char* transkey, const char* textstring, LodePNG_CompressSettings* zlibsettings)
-{
- unsigned error = 0;
- ucvector data, compressed_data;
- size_t i, textsize = strlen(textstring);
-
- ucvector_init(&data);
-
- for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]);
- ucvector_push_back(&data, 0); /*null termination char*/
- ucvector_push_back(&data, compressed ? 1 : 0); /*compression flag*/
- ucvector_push_back(&data, 0); /*compression method*/
- for(i = 0; langtag[i] != 0; i++) ucvector_push_back(&data, (unsigned char)langtag[i]);
- ucvector_push_back(&data, 0); /*null termination char*/
- for(i = 0; transkey[i] != 0; i++) ucvector_push_back(&data, (unsigned char)transkey[i]);
- ucvector_push_back(&data, 0); /*null termination char*/
-
- if(compressed)
- {
- ucvector_init(&compressed_data);
- error = LodePNG_zlib_compress(&compressed_data.data, &compressed_data.size,
- (unsigned char*)textstring, textsize, zlibsettings);
- if(!error)
- {
- for(i = 0; i < compressed_data.size; i++) ucvector_push_back(&data, compressed_data.data[i]);
- for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]);
- }
- }
- else /*not compressed*/
- {
- for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]);
- }
-
- if(!error) error = addChunk(out, "iTXt", data.data, data.size);
- ucvector_cleanup(&data);
- return error;
-}
-
-static unsigned addChunk_bKGD(ucvector* out, const LodePNG_InfoPng* info)
-{
- unsigned error = 0;
- ucvector bKGD;
- ucvector_init(&bKGD);
- if(info->color.colorType == 0 || info->color.colorType == 4)
- {
- ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256));
- ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256));
- }
- else if(info->color.colorType == 2 || info->color.colorType == 6)
- {
- ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256));
- ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256));
- ucvector_push_back(&bKGD, (unsigned char)(info->background_g / 256));
- ucvector_push_back(&bKGD, (unsigned char)(info->background_g % 256));
- ucvector_push_back(&bKGD, (unsigned char)(info->background_b / 256));
- ucvector_push_back(&bKGD, (unsigned char)(info->background_b % 256));
- }
- else if(info->color.colorType == 3)
- {
- ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); /*palette index*/
- }
-
- error = addChunk(out, "bKGD", bKGD.data, bKGD.size);
- ucvector_cleanup(&bKGD);
-
- return error;
-}
-
-static unsigned addChunk_tIME(ucvector* out, const LodePNG_Time* time)
-{
- unsigned error = 0;
- unsigned char* data = (unsigned char*)malloc(7);
- if(!data) return 9948; /*alloc fail*/
- data[0] = (unsigned char)(time->year / 256);
- data[1] = (unsigned char)(time->year % 256);
- data[2] = time->month;
- data[3] = time->day;
- data[4] = time->hour;
- data[5] = time->minute;
- data[6] = time->second;
- error = addChunk(out, "tIME", data, 7);
- free(data);
- return error;
-}
-
-static unsigned addChunk_pHYs(ucvector* out, const LodePNG_InfoPng* info)
-{
- unsigned error = 0;
- ucvector data;
- ucvector_init(&data);
-
- LodePNG_add32bitInt(&data, info->phys_x);
- LodePNG_add32bitInt(&data, info->phys_y);
- ucvector_push_back(&data, info->phys_unit);
-
- error = addChunk(out, "pHYs", data.data, data.size);
- ucvector_cleanup(&data);
-
- return error;
-}
-
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
-static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline,
- size_t length, size_t bytewidth, unsigned char filterType)
-{
- size_t i;
- switch(filterType)
- {
- case 0: /*None*/
- for(i = 0; i < length; i++) out[i] = scanline[i];
- break;
- case 1: /*Sub*/
- if(prevline)
- {
- for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
- for(i = bytewidth; i < length ; i++) out[i] = scanline[i] - scanline[i - bytewidth];
- }
- else
- {
- for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
- for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth];
- }
- break;
- case 2: /*Up*/
- if(prevline)
- {
- for(i = 0; i < length; i++) out[i] = scanline[i] - prevline[i];
- }
- else
- {
- for(i = 0; i < length; i++) out[i] = scanline[i];
- }
- break;
- case 3: /*Average*/
- if(prevline)
- {
- for(i = 0; i < bytewidth; i++) out[i] = scanline[i] - prevline[i] / 2;
- for(i = bytewidth; i < length; i++) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) / 2);
- }
- else
- {
- for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
- for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth] / 2;
- }
- break;
- case 4: /*Paeth*/
- if(prevline)
- {
- /*paethPredictor(0, prevline[i], 0) is always prevline[i]*/
- for(i = 0; i < bytewidth; i++) out[i] = (scanline[i] - prevline[i]);
- for(i = bytewidth; i < length; i++)
- {
- out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth]));
- }
- }
- else
- {
- for(i = 0; i < bytewidth; i++) out[i] = scanline[i];
- /*paethPredictor(scanline[i - bytewidth], 0, 0) is always scanline[i - bytewidth]*/
- for(i = bytewidth; i < length; i++) out[i] = (scanline[i] - scanline[i - bytewidth]);
- }
- break;
- default: return; /*unexisting filter type given*/
- }
-}
-
-static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h,
- const LodePNG_InfoColor* info, const LodePNG_EncodeSettings* settings)
-{
- /*
- For PNG filter method 0
- out must be a buffer with as size: h + (w * h * bpp + 7) / 8, because there are
- the scanlines with 1 extra byte per scanline
- */
-
- unsigned bpp = LodePNG_InfoColor_getBpp(info);
- /*the width of a scanline in bytes, not including the filter type*/
- size_t linebytes = (w * bpp + 7) / 8;
- /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/
- size_t bytewidth = (bpp + 7) / 8;
- const unsigned char* prevline = 0;
- unsigned x, y;
- unsigned error = 0;
-
- if(bpp == 0) return 31; /*error: invalid color type*/
-
- if(!settings->bruteForceFilters)
- {
- /*
- There is a heuristic called the minimum sum of absolute differences heuristic, suggested by the PNG standard:
- * If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e.
- use fixed filtering, with the filter None).
- * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is
- not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply
- all five filters and select the filter that produces the smallest sum of absolute values per row.
- */
- if(info->colorType == 3 || info->bitDepth < 8) /*None filtertype for everything*/
- {
- for(y = 0; y < h; y++)
- {
- size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
- size_t inindex = linebytes * y;
- const unsigned TYPE = 0;
- out[outindex] = TYPE; /*filter type byte*/
- filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, TYPE);
- prevline = &in[inindex];
- }
- }
- else /*adaptive filtering*/
- {
- size_t sum[5];
- ucvector attempt[5]; /*five filtering attempts, one for each filter type*/
- size_t smallest = 0;
- unsigned type, bestType = 0;
-
- for(type = 0; type < 5; type++) ucvector_init(&attempt[type]);
- for(type = 0; type < 5; type++)
- {
- if(!ucvector_resize(&attempt[type], linebytes)) ERROR_BREAK(9949 /*alloc fail*/);
- }
-
- if(!error)
- {
- for(y = 0; y < h; y++)
- {
- /*try the 5 filter types*/
- for(type = 0; type < 5; type++)
- {
- filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);
-
- /*calculate the sum of the result*/
- sum[type] = 0;
- /*note that not all pixels are checked to speed this up while still having probably the best choice*/
- for(x = 0; x < attempt[type].size; x+=3)
- {
- /*For differences, each byte should be treated as signed, values above 127 are negative
- (converted to signed char). Filtertype 0 isn't a difference though, so use unsigned there.
- This means filtertype 0 is almost never chosen, but that is justified.*/
- if(type == 0) sum[type] += (unsigned char)(attempt[type].data[x]);
- else
- {
- signed char s = (signed char)(attempt[type].data[x]);
- sum[type] += s < 0 ? -s : s;
- }
- }
-
- /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/
- if(type == 0 || sum[type] < smallest)
- {
- bestType = type;
- smallest = sum[type];
- }
- }
-
- prevline = &in[y * linebytes];
-
- /*now fill the out values*/
- out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
- for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x];
- }
- }
-
- for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]);
- }
- }
- else
- {
- /*brute force filter chooser.
- deflate the scanline after every filter attempt to see which one deflates best.
- This is very slow and gives only slightly smaller, sometimes even larger, result*/
- size_t size[5];
- ucvector attempt[5]; /*five filtering attempts, one for each filter type*/
- size_t smallest;
- unsigned type = 0, bestType = 0;
- unsigned char* dummy;
- LodePNG_CompressSettings zlibsettings = settings->zlibsettings;
- /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose,
- to simulate the true case where the tree is the same for the whole image. Sometimes it gives
- better result with dynamic tree anyway. Using the fixed tree sometimes gives worse, but in rare
- cases better compression. It does make this a bit less slow, so it's worth doing this.*/
- zlibsettings.btype = 1;
- for(type = 0; type < 5; type++)
- {
- ucvector_init(&attempt[type]);
- ucvector_resize(&attempt[type], linebytes); /*todo: give error if resize failed*/
- }
- for(y = 0; y < h; y++) /*try the 5 filter types*/
- {
- for(type = 0; type < 5; type++)
- {
- unsigned testsize = attempt[type].size;
- /*unsigned testsize = attempt[type].size / 8;*/ /*it already works good enough by testing a part of the row*/
- /*if(testsize == 0) testsize = attempt[type].size;*/
-
- filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);
- size[type] = 0;
- dummy = 0;
- LodePNG_zlib_compress(&dummy, &size[type], attempt[type].data, testsize, &zlibsettings);
- free(dummy);
- /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/
- if(type == 0 || size[type] < smallest)
- {
- bestType = type;
- smallest = size[type];
- }
- }
- prevline = &in[y * linebytes];
- out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
- for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x];
- }
- for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]);
- }
-
- return error;
-}
-
-static void addPaddingBits(unsigned char* out, const unsigned char* in,
- size_t olinebits, size_t ilinebits, unsigned h)
-{
- /*The opposite of the removePaddingBits function
- olinebits must be >= ilinebits*/
- unsigned y;
- size_t diff = olinebits - ilinebits;
- size_t obp = 0, ibp = 0; /*bit pointers*/
- for(y = 0; y < h; y++)
- {
- size_t x;
- for(x = 0; x < ilinebits; x++)
- {
- unsigned char bit = readBitFromReversedStream(&ibp, in);
- setBitOfReversedStream(&obp, out, bit);
- }
- /*obp += diff; --> no, fill in some value in the padding bits too, to avoid
- "Use of uninitialised value of size ###" warning from valgrind*/
- for(x = 0; x < diff; x++) setBitOfReversedStream(&obp, out, 0);
- }
-}
-
-static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp)
-{
- /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines with non-multiple-of-8
- bit amounts, only between reduced images is padding*/
- unsigned passw[7], passh[7];
- size_t filter_passstart[8], padded_passstart[8], passstart[8];
- unsigned i;
-
- Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
-
- if(bpp >= 8)
- {
- for(i = 0; i < 7; i++)
- {
- unsigned x, y, b;
- size_t bytewidth = bpp / 8;
- for(y = 0; y < passh[i]; y++)
- for(x = 0; x < passw[i]; x++)
- {
- size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth;
- size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth;
- for(b = 0; b < bytewidth; b++)
- {
- out[pixeloutstart + b] = in[pixelinstart + b];
- }
- }
- }
- }
- else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/
- {
- for(i = 0; i < 7; i++)
- {
- unsigned x, y, b;
- unsigned ilinebits = bpp * passw[i];
- unsigned olinebits = bpp * w;
- size_t obp, ibp; /*bit pointers (for out and in buffer)*/
- for(y = 0; y < passh[i]; y++)
- for(x = 0; x < passw[i]; x++)
- {
- ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp;
- obp = (8 * passstart[i]) + (y * ilinebits + x * bpp);
- for(b = 0; b < bpp; b++)
- {
- unsigned char bit = readBitFromReversedStream(&ibp, in);
- setBitOfReversedStream(&obp, out, bit);
- }
- }
- }
- }
-}
-
-/*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image.
-return value is error**/
-static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in,
- const LodePNG_InfoPng* infoPng, const LodePNG_EncodeSettings* settings)
-{
- /*
- This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps:
- *) if no Adam7: 1) add padding bits (= posible extra bits per scanline if bpp < 8) 2) filter
- *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter
- */
- unsigned bpp = LodePNG_InfoColor_getBpp(&infoPng->color);
- unsigned w = infoPng->width;
- unsigned h = infoPng->height;
- unsigned error = 0;
-
- if(infoPng->interlaceMethod == 0)
- {
- *outsize = h + (h * ((w * bpp + 7) / 8)); /*image size plus an extra byte per scanline + possible padding bits*/
- *out = (unsigned char*)malloc(*outsize);
- if(!(*out) && (*outsize)) error = 9950; /*alloc fail*/
-
- if(!error)
- {
- /*non multiple of 8 bits per scanline, padding bits needed per scanline*/
- if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8)
- {
- ucvector padded;
- ucvector_init(&padded);
- if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 9951; /*alloc fail*/
- if(!error)
- {
- addPaddingBits(padded.data, in, ((w * bpp + 7) / 8) * 8, w * bpp, h);
- error = filter(*out, padded.data, w, h, &infoPng->color, settings);
- }
- ucvector_cleanup(&padded);
- }
- else
- {
- /*we can immediatly filter into the out buffer, no other steps needed*/
- error = filter(*out, in, w, h, &infoPng->color, settings);
- }
- }
- }
- else /*interlaceMethod is 1 (Adam7)*/
- {
- unsigned char* adam7 = (unsigned char*)malloc((h * w * bpp + 7) / 8);
- if(!adam7 && ((h * w * bpp + 7) / 8)) error = 9952; /*alloc fail*/
-
- while(!error) /*not a real while loop, used to break out to cleanup to avoid a goto*/
- {
- unsigned passw[7], passh[7];
- size_t filter_passstart[8], padded_passstart[8], passstart[8];
- unsigned i;
-
- Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
-
- *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/
- *out = (unsigned char*)malloc(*outsize);
- if(!(*out) && (*outsize)) ERROR_BREAK(9953 /*alloc fail*/);
-
- Adam7_interlace(adam7, in, w, h, bpp);
-
- for(i = 0; i < 7; i++)
- {
- if(bpp < 8)
- {
- ucvector padded;
- ucvector_init(&padded);
- if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 9954; /*alloc fail*/
- if(!error)
- {
- addPaddingBits(&padded.data[padded_passstart[i]], &adam7[passstart[i]],
- ((passw[i] * bpp + 7) / 8) * 8, passw[i] * bpp, passh[i]);
- error = filter(&(*out)[filter_passstart[i]], &padded.data[padded_passstart[i]],
- passw[i], passh[i], &infoPng->color, settings);
- }
-
- ucvector_cleanup(&padded);
- }
- else
- {
- error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]],
- passw[i], passh[i], &infoPng->color, settings);
- }
- }
-
- break;
- }
-
- free(adam7);
- }
-
- return error;
-}
-
-/*palette must have 4 * palettesize bytes allocated, and given in format RGBARGBARGBARGBA...*/
-static unsigned isPaletteFullyOpaque(const unsigned char* palette, size_t palettesize)
-{
- size_t i;
- for(i = 0; i < palettesize; i++)
- {
- if(palette[4 * i + 3] != 255) return 0;
- }
- return 1;
-}
-
-/*this function checks if the input image given by the user has no transparent pixels*/
-static unsigned isFullyOpaque(const unsigned char* image, unsigned w, unsigned h, const LodePNG_InfoColor* info)
-{
- /*TODO: When the user specified a color key for the input image, then this function must
- also check for pixels that are the same as the color key and treat those as transparent.*/
-
- unsigned i, numpixels = w * h;
- if(info->colorType == 6)
- {
- if(info->bitDepth == 8)
- {
- for(i = 0; i < numpixels; i++)
- {
- if(image[i * 4 + 3] != 255) return 0;
- }
- }
- else
- {
- for(i = 0; i < numpixels; i++)
- {
- if(image[i * 8 + 6] != 255 || image[i * 8 + 7] != 255) return 0;
- }
- }
- return 1; /*no single pixel with alpha channel other than 255 found*/
- }
- else if(info->colorType == 4)
- {
- if(info->bitDepth == 8)
- {
- for(i = 0; i < numpixels; i++)
- {
- if(image[i * 2 + 1] != 255) return 0;
- }
- }
- else
- {
- for(i = 0; i < numpixels; i++)
- {
- if(image[i * 4 + 2] != 255 || image[i * 4 + 3] != 255) return 0;
- }
- }
- return 1; /*no single pixel with alpha channel other than 255 found*/
- }
- else if(info->colorType == 3)
- {
- /*when there's a palette, we could check every pixel for translucency,
- but much quicker is to just check the palette*/
- return(isPaletteFullyOpaque(info->palette, info->palettesize));
- }
-
- return 0; /*color type that isn't supported by this function yet, so assume there is transparency to be safe*/
-}
-
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
-static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize)
-{
- unsigned char* inchunk = data;
- while((size_t)(inchunk - data) < datasize)
- {
- unsigned error = LodePNG_append_chunk(&out->data, &out->size, inchunk);
- if(error) return error; /*error: not enough memory*/
- out->allocsize = out->size; /*fix the allocsize again*/
- inchunk = LodePNG_chunk_next(inchunk);
- }
- return 0;
-}
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-
-void LodePNG_Encoder_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize,
- const unsigned char* image, unsigned w, unsigned h)
-{
- LodePNG_InfoPng info;
- ucvector outv;
- unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/
- size_t datasize = 0;
-
- /*provide some proper output values if error will happen*/
- *out = 0;
- *outsize = 0;
- encoder->error = 0;
-
- /*UNSAFE copy to avoid having to cleanup! but we will only change primitive parameters,
- and not invoke the cleanup function nor touch the palette's buffer so we use it safely*/
- info = encoder->infoPng;
- info.width = w;
- info.height = h;
-
- if(encoder->settings.autoLeaveOutAlphaChannel && isFullyOpaque(image, w, h, &encoder->infoRaw.color))
- {
- /*go to a color type without alpha channel*/
- if(info.color.colorType == 6) info.color.colorType = 2;
- else if(info.color.colorType == 4) info.color.colorType = 0;
- }
-
- if(encoder->settings.zlibsettings.windowSize > 32768)
- {
- encoder->error = 60; /*error: windowsize larger than allowed*/
- return;
- }
- if(encoder->settings.zlibsettings.btype > 2)
- {
- encoder->error = 61; /*error: unexisting btype*/
- return;
- }
- if(encoder->infoPng.interlaceMethod > 1)
- {
- encoder->error = 71; /*error: unexisting interlace mode*/
- return;
- }
- /*error: unexisting color type given*/
- if((encoder->error = checkColorValidity(info.color.colorType, info.color.bitDepth))) return;
- /*error: unexisting color type given*/
- if((encoder->error = checkColorValidity(encoder->infoRaw.color.colorType, encoder->infoRaw.color.bitDepth))) return;
-
- if(!LodePNG_InfoColor_equal(&encoder->infoRaw.color, &info.color))
- {
- unsigned char* converted;
- size_t size = (w * h * LodePNG_InfoColor_getBpp(&info.color) + 7) / 8;
-
- if((info.color.colorType != 6 && info.color.colorType != 2) || (info.color.bitDepth != 8))
- {
- encoder->error = 59; /*for the output image, only these types are supported*/
- return;
- }
- converted = (unsigned char*)malloc(size);
- if(!converted && size) encoder->error = 9955; /*alloc fail*/
- if(!encoder->error)
- {
- encoder->error = LodePNG_convert(converted, image, &info.color, &encoder->infoRaw.color, w, h);
- }
- if(!encoder->error) preProcessScanlines(&data, &datasize, converted, &info, &encoder->settings);
- free(converted);
- }
- else preProcessScanlines(&data, &datasize, image, &info, &encoder->settings);
-
- ucvector_init(&outv);
- while(!encoder->error) /*while only executed once, to break on error*/
- {
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- size_t i;
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
- /*write signature and chunks*/
- writeSignature(&outv);
- /*IHDR*/
- addChunk_IHDR(&outv, w, h, info.color.bitDepth, info.color.colorType, info.interlaceMethod);
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- /*unknown chunks between IHDR and PLTE*/
- if(info.unknown_chunks.data[0])
- {
- encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[0], info.unknown_chunks.datasize[0]);
- if(encoder->error) break;
- }
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- /*PLTE*/
- if(info.color.colorType == 3)
- {
- if(info.color.palettesize == 0 || info.color.palettesize > 256)
- {
- encoder->error = 68; /*invalid palette size*/
- break;
- }
- addChunk_PLTE(&outv, &info.color);
- }
- if(encoder->settings.force_palette && (info.color.colorType == 2 || info.color.colorType == 6))
- {
- if(info.color.palettesize == 0 || info.color.palettesize > 256)
- {
- encoder->error = 68; /*invalid palette size*/
- break;
- }
- addChunk_PLTE(&outv, &info.color);
- }
- /*tRNS*/
- if(info.color.colorType == 3 && !isPaletteFullyOpaque(info.color.palette, info.color.palettesize))
- {
- addChunk_tRNS(&outv, &info.color);
- }
- if((info.color.colorType == 0 || info.color.colorType == 2) && info.color.key_defined)
- {
- addChunk_tRNS(&outv, &info.color);
- }
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- /*bKGD (must come between PLTE and the IDAt chunks*/
- if(info.background_defined) addChunk_bKGD(&outv, &info);
- /*pHYs (must come before the IDAT chunks)*/
- if(info.phys_defined) addChunk_pHYs(&outv, &info);
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- /*unknown chunks between PLTE and IDAT*/
- if(info.unknown_chunks.data[1])
- {
- encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[1], info.unknown_chunks.datasize[1]);
- if(encoder->error) break;
- }
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- /*IDAT (multiple IDAT chunks must be consecutive)*/
- encoder->error = addChunk_IDAT(&outv, data, datasize, &encoder->settings.zlibsettings);
- if(encoder->error) break;
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- /*tIME*/
- if(info.time_defined) addChunk_tIME(&outv, &info.time);
- /*tEXt and/or zTXt*/
- for(i = 0; i < info.text.num; i++)
- {
- if(strlen(info.text.keys[i]) > 79)
- {
- encoder->error = 66; /*text chunk too large*/
- break;
- }
- if(strlen(info.text.keys[i]) < 1)
- {
- encoder->error = 67; /*text chunk too small*/
- break;
- }
- if(encoder->settings.text_compression)
- addChunk_zTXt(&outv, info.text.keys[i], info.text.strings[i], &encoder->settings.zlibsettings);
- else
- addChunk_tEXt(&outv, info.text.keys[i], info.text.strings[i]);
- }
- /*LodePNG version id in text chunk*/
- if(encoder->settings.add_id)
- {
- unsigned alread_added_id_text = 0;
- for(i = 0; i < info.text.num; i++)
- {
- if(!strcmp(info.text.keys[i], "LodePNG"))
- {
- alread_added_id_text = 1;
- break;
- }
- }
- if(alread_added_id_text == 0)
- addChunk_tEXt(&outv, "LodePNG", VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/
- }
- /*iTXt*/
- for(i = 0; i < info.itext.num; i++)
- {
- if(strlen(info.itext.keys[i]) > 79)
- {
- encoder->error = 66; /*text chunk too large*/
- break;
- }
- if(strlen(info.itext.keys[i]) < 1)
- {
- encoder->error = 67; /*text chunk too small*/
- break;
- }
- addChunk_iTXt(&outv, encoder->settings.text_compression,
- info.itext.keys[i], info.itext.langtags[i], info.itext.transkeys[i], info.itext.strings[i],
- &encoder->settings.zlibsettings);
- }
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- /*unknown chunks between IDAT and IEND*/
- if(info.unknown_chunks.data[2])
- {
- encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[2], info.unknown_chunks.datasize[2]);
- if(encoder->error) break;
- }
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
- /*IEND*/
- addChunk_IEND(&outv);
-
- break; /*this isn't really a while loop; no error happened so break out now!*/
- }
-
- free(data);
- /*instead of cleaning the vector up, give it to the output*/
- *out = outv.data;
- *outsize = outv.size;
-}
-
-unsigned LodePNG_encode(unsigned char** out, size_t* outsize, const unsigned char* image,
- unsigned w, unsigned h, unsigned colorType, unsigned bitDepth)
-{
- unsigned error;
- LodePNG_Encoder encoder;
- LodePNG_Encoder_init(&encoder);
- encoder.infoRaw.color.colorType = colorType;
- encoder.infoRaw.color.bitDepth = bitDepth;
- encoder.infoPng.color.colorType = colorType;
- encoder.infoPng.color.bitDepth = bitDepth;
- LodePNG_Encoder_encode(&encoder, out, outsize, image, w, h);
- error = encoder.error;
- LodePNG_Encoder_cleanup(&encoder);
- return error;
-}
-
-unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h)
-{
- return LodePNG_encode(out, outsize, image, w, h, 6, 8);
-}
-
-unsigned LodePNG_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h)
-{
- return LodePNG_encode(out, outsize, image, w, h, 2, 8);
-}
-
-#ifdef LODEPNG_COMPILE_DISK
-unsigned LodePNG_encode_file(const char* filename, const unsigned char* image, unsigned w, unsigned h,
- unsigned colorType, unsigned bitDepth)
-{
- unsigned char* buffer;
- size_t buffersize;
- unsigned error = LodePNG_encode(&buffer, &buffersize, image, w, h, colorType, bitDepth);
- if(!error) error = LodePNG_saveFile(buffer, buffersize, filename);
- free(buffer);
- return error;
-}
-
-unsigned LodePNG_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h)
-{
- return LodePNG_encode_file(filename, image, w, h, 6, 8);
-}
-
-unsigned LodePNG_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h)
-{
- return LodePNG_encode_file(filename, image, w, h, 2, 8);
-}
-#endif /*LODEPNG_COMPILE_DISK*/
-
-void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings)
-{
- LodePNG_CompressSettings_init(&settings->zlibsettings);
- settings->bruteForceFilters = 0;
- settings->autoLeaveOutAlphaChannel = 1;
- settings->force_palette = 0;
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- settings->add_id = 1;
- settings->text_compression = 0;
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-}
-
-void LodePNG_Encoder_init(LodePNG_Encoder* encoder)
-{
- LodePNG_EncodeSettings_init(&encoder->settings);
- LodePNG_InfoPng_init(&encoder->infoPng);
- LodePNG_InfoRaw_init(&encoder->infoRaw);
- encoder->error = 1;
-}
-
-void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder)
-{
- LodePNG_InfoPng_cleanup(&encoder->infoPng);
- LodePNG_InfoRaw_cleanup(&encoder->infoRaw);
-}
-
-void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source)
-{
- LodePNG_Encoder_cleanup(dest);
- *dest = *source;
- LodePNG_InfoPng_init(&dest->infoPng);
- LodePNG_InfoRaw_init(&dest->infoRaw);
- dest->error = LodePNG_InfoPng_copy(&dest->infoPng, &source->infoPng);
- if(dest->error) return;
- dest->error = LodePNG_InfoRaw_copy(&dest->infoRaw, &source->infoRaw);
- if(dest->error) return;
-}
-
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#endif /*LODEPNG_COMPILE_PNG*/
-
-#ifdef LODEPNG_COMPILE_ERROR_TEXT
-
-/*
-This returns the description of a numerical error code in English. This is also
-the documentation of all the error codes.
-*/
-const char* LodePNG_error_text(unsigned code)
-{
- switch(code)
- {
- case 0: return "no error, everything went ok";
- case 1: return "nothing done yet"; /*the Encoder/Decoder has done nothing yet, error checking makes no sense yet*/
- case 10: return "end of input memory reached without huffman end code"; /*while huffman decoding*/
- case 11: return "error in code tree made it jump outside of huffman tree"; /*while huffman decoding*/
- case 13: return "problem while processing dynamic deflate block";
- case 14: return "problem while processing dynamic deflate block";
- case 15: return "problem while processing dynamic deflate block";
- case 16: return "unexisting code while processing dynamic deflate block";
- case 17: return "end of out buffer memory reached while inflating";
- case 18: return "invalid distance code while inflating";
- case 19: return "end of out buffer memory reached while inflating";
- case 20: return "invalid deflate block BTYPE encountered while decoding";
- case 21: return "NLEN is not ones complement of LEN in a deflate block";
-
- /*end of out buffer memory reached while inflating:
- This can happen if the inflated deflate data is longer than the amount of bytes required to fill up
- all the pixels of the image, given the color depth and image dimensions. Something that doesn't
- happen in a normal, well encoded, PNG image.*/
- case 22: return "end of out buffer memory reached while inflating";
-
- case 23: return "end of in buffer memory reached while inflating";
- case 24: return "invalid FCHECK in zlib header";
- case 25: return "invalid compression method in zlib header";
- case 26: return "FDICT encountered in zlib header while it's not used for PNG";
- case 27: return "PNG file is smaller than a PNG header";
- /*Checks the magic file header, the first 8 bytes of the PNG file*/
- case 28: return "incorrect PNG signature, it's no PNG or corrupted";
- case 29: return "first chunk is not the header chunk";
- case 30: return "chunk length too large, chunk broken off at end of file";
- case 31: return "illegal PNG color type or bpp";
- case 32: return "illegal PNG compression method";
- case 33: return "illegal PNG filter method";
- case 34: return "illegal PNG interlace method";
- case 35: return "chunk length of a chunk is too large or the chunk too small";
- case 36: return "illegal PNG filter type encountered";
- case 37: return "illegal bit depth for this color type given";
- case 38: return "the palette is too big"; /*more than 256 colors*/
- case 39: return "more palette alpha values given in tRNS chunk than there are colors in the palette";
- case 40: return "tRNS chunk has wrong size for greyscale image";
- case 41: return "tRNS chunk has wrong size for RGB image";
- case 42: return "tRNS chunk appeared while it was not allowed for this color type";
- case 43: return "bKGD chunk has wrong size for palette image";
- case 44: return "bKGD chunk has wrong size for greyscale image";
- case 45: return "bKGD chunk has wrong size for RGB image";
- /*Is the palette too small?*/
- case 46: return "a value in indexed image is larger than the palette size (bitdepth = 8)";
- /*Is the palette too small?*/
- case 47: return "a value in indexed image is larger than the palette size (bitdepth < 8)";
- /*the input data is empty, maybe a PNG file doesn't exist or is in the wrong path*/
- case 48: return "empty input or file doesn't exist";
- case 49: return "jumped past memory while generating dynamic huffman tree";
- case 50: return "jumped past memory while generating dynamic huffman tree";
- case 51: return "jumped past memory while inflating huffman block";
- case 52: return "jumped past memory while inflating";
- case 53: return "size of zlib data too small";
-
- /*jumped past tree while generating huffman tree, this could be when the
- tree will have more leaves than symbols after generating it out of the
- given lenghts. They call this an oversubscribed dynamic bit lengths tree in zlib.*/
- case 55: return "jumped past tree while generating huffman tree";
-
- case 56: return "given output image colorType or bitDepth not supported for color conversion";
- case 57: return "invalid CRC encountered (checking CRC can be disabled)";
- case 58: return "invalid ADLER32 encountered (checking ADLER32 can be disabled)";
- case 59: return "conversion to unexisting color mode or color mode conversion not supported";
- case 60: return "invalid window size given in the settings of the encoder (must be 0-32768)";
- case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)";
- /*LodePNG leaves the choice of RGB to greyscale conversion formula to the user.*/
- case 62: return "conversion from RGB to greyscale not supported";
- case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk"; /*(2^31-1)*/
- /*this would result in the inability of a deflated block to ever contain an end code. It must be at least 1.*/
- case 64: return "the length of the END symbol 256 in the Huffman tree is 0";
- case 66: return "the length of a text chunk keyword given to the encoder is longer than the maximum of 79 bytes";
- case 67: return "the length of a text chunk keyword given to the encoder is smaller than the minimum of 1 byte";
- case 68: return "tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors";
- case 69: return "unknown chunk type with 'critical' flag encountered by the decoder";
- case 71: return "unexisting interlace mode given to encoder (must be 0 or 1)";
- case 72: return "while decoding, unexisting compression method encountering in zTXt or iTXt chunk (it must be 0)";
- case 73: return "invalid tIME chunk size";
- case 74: return "invalid pHYs chunk size";
- /*length could be wrong, or data chopped off*/
- case 75: return "no null termination char found while decoding text chunk";
- case 76: return "iTXt chunk too short to contain required bytes";
- case 77: return "integer overflow in buffer size";
- case 78: return "failed to open file for reading"; /*file doesn't exist or couldn't be opened for reading*/
- case 79: return "failed to open file for writing";
- case 80: return "tried creating a tree of 0 symbols";
- case 81: return "lazy matching at pos 0 is impossible";
- default: ; /*nothing to do here, checks for other error values are below*/
- }
-
- if(code >= 9900 && code <= 9999) return "memory allocation failed";
-
- return "unknown error code";
-}
-
-#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* // End of PNG related code. Begin of C++ wrapper. // */
-/* ////////////////////////////////////////////////////////////////////////// */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef __cplusplus
-namespace LodePNG
-{
-#ifdef LODEPNG_COMPILE_DISK
- void loadFile(std::vector<unsigned char>& buffer, const std::string& filename)
- {
- std::ifstream file(filename.c_str(), std::ios::in|std::ios::binary|std::ios::ate);
-
- /*get filesize*/
- std::streamsize size = 0;
- if(file.seekg(0, std::ios::end).good()) size = file.tellg();
- if(file.seekg(0, std::ios::beg).good()) size -= file.tellg();
-
- /*read contents of the file into the vector*/
- buffer.resize(size_t(size));
- if(size > 0) file.read((char*)(&buffer[0]), size);
- }
-
- /*write given buffer to the file, overwriting the file, it doesn't append to it.*/
- void saveFile(const std::vector<unsigned char>& buffer, const std::string& filename)
- {
- std::ofstream file(filename.c_str(), std::ios::out|std::ios::binary);
- file.write(buffer.empty() ? 0 : (char*)&buffer[0], std::streamsize(buffer.size()));
- }
-#endif //LODEPNG_COMPILE_DISK
-
-/* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_ZLIB
-#ifdef LODEPNG_COMPILE_DECODER
- unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
- const LodePNG_DecompressSettings& settings)
- {
- unsigned char* buffer = 0;
- size_t buffersize = 0;
- unsigned error = LodePNG_zlib_decompress(&buffer, &buffersize, in, insize, &settings);
- if(buffer)
- {
- out.insert(out.end(), &buffer[0], &buffer[buffersize]);
- free(buffer);
- }
- return error;
- }
-
- unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
- const LodePNG_DecompressSettings& settings)
- {
- return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings);
- }
-#endif //LODEPNG_COMPILE_DECODER
-
-#ifdef LODEPNG_COMPILE_ENCODER
- unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
- const LodePNG_CompressSettings& settings)
- {
- unsigned char* buffer = 0;
- size_t buffersize = 0;
- unsigned error = LodePNG_zlib_compress(&buffer, &buffersize, in, insize, &settings);
- if(buffer)
- {
- out.insert(out.end(), &buffer[0], &buffer[buffersize]);
- free(buffer);
- }
- return error;
- }
-
- unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
- const LodePNG_CompressSettings& settings)
- {
- return compress(out, in.empty() ? 0 : &in[0], in.size(), settings);
- }
-#endif //LODEPNG_COMPILE_ENCODER
-#endif //LODEPNG_COMPILE_ZLIB
-
-#ifdef LODEPNG_COMPILE_PNG
-#ifdef LODEPNG_COMPILE_DECODER
- Decoder::Decoder()
- {
- LodePNG_Decoder_init(this);
- }
-
- Decoder::~Decoder()
- {
- LodePNG_Decoder_cleanup(this);
- }
-
- void Decoder::operator=(const LodePNG_Decoder& other)
- {
- LodePNG_Decoder_copy(this, &other);
- }
-
- bool Decoder::hasError() const
- {
- return error != 0;
- }
- unsigned Decoder::getError() const
- {
- return error;
- }
-
- unsigned Decoder::getWidth() const
- {
- return infoPng.width;
- }
-
- unsigned Decoder::getHeight() const
- {
- return infoPng.height;
- }
-
- unsigned Decoder::getBpp()
- {
- return LodePNG_InfoColor_getBpp(&infoPng.color);
- }
-
- unsigned Decoder::getChannels()
- {
- return LodePNG_InfoColor_getChannels(&infoPng.color);
- }
-
- unsigned Decoder::isGreyscaleType()
- {
- return LodePNG_InfoColor_isGreyscaleType(&infoPng.color);
- }
-
- unsigned Decoder::isAlphaType()
- {
- return LodePNG_InfoColor_isAlphaType(&infoPng.color);
- }
-
- void Decoder::decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize)
- {
- unsigned char* buffer;
- size_t buffersize;
- LodePNG_Decoder_decode(this, &buffer, &buffersize, in, insize);
- if(buffer)
- {
- out.insert(out.end(), &buffer[0], &buffer[buffersize]);
- free(buffer);
- }
- }
-
- void Decoder::decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in)
- {
- decode(out, in.empty() ? 0 : &in[0], in.size());
- }
-
- void Decoder::inspect(const unsigned char* in, size_t insize)
- {
- LodePNG_Decoder_inspect(this, in, insize);
- }
-
- void Decoder::inspect(const std::vector<unsigned char>& in)
- {
- inspect(in.empty() ? 0 : &in[0], in.size());
- }
-
- const LodePNG_DecodeSettings& Decoder::getSettings() const
- {
- return settings;
- }
-
- LodePNG_DecodeSettings& Decoder::getSettings()
- {
- return settings;
- }
-
- void Decoder::setSettings(const LodePNG_DecodeSettings& settings)
- {
- this->settings = settings;
- }
-
- const LodePNG_InfoPng& Decoder::getInfoPng() const
- {
- return infoPng;
- }
-
- LodePNG_InfoPng& Decoder::getInfoPng()
- {
- return infoPng;
- }
-
- void Decoder::setInfoPng(const LodePNG_InfoPng& info)
- {
- error = LodePNG_InfoPng_copy(&this->infoPng, &info);
- }
-
- void Decoder::swapInfoPng(LodePNG_InfoPng& info)
- {
- LodePNG_InfoPng_swap(&this->infoPng, &info);
- }
-
- const LodePNG_InfoRaw& Decoder::getInfoRaw() const
- {
- return infoRaw;
- }
-
- LodePNG_InfoRaw& Decoder::getInfoRaw()
- {
- return infoRaw;
- }
-
- void Decoder::setInfoRaw(const LodePNG_InfoRaw& info)
- {
- error = LodePNG_InfoRaw_copy(&this->infoRaw, &info);
- }
-
-#endif //LODEPNG_COMPILE_DECODER
-
- /* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
- Encoder::Encoder()
- {
- LodePNG_Encoder_init(this);
- }
-
- Encoder::~Encoder()
- {
- LodePNG_Encoder_cleanup(this);
- }
-
- void Encoder::operator=(const LodePNG_Encoder& other)
- {
- LodePNG_Encoder_copy(this, &other);
- }
-
- bool Encoder::hasError() const
- {
- return error != 0;
- }
-
- unsigned Encoder::getError() const
- {
- return error;
- }
-
- void Encoder::encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h)
- {
- unsigned char* buffer;
- size_t buffersize;
- LodePNG_Encoder_encode(this, &buffer, &buffersize, image, w, h);
- if(buffer)
- {
- out.insert(out.end(), &buffer[0], &buffer[buffersize]);
- free(buffer);
- }
- }
-
- void Encoder::encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image,
- unsigned w, unsigned h)
- {
- encode(out, image.empty() ? 0 : &image[0], w, h);
- }
-
- void Encoder::clearPalette()
- {
- LodePNG_InfoColor_clearPalette(&infoPng.color);
- }
-
- void Encoder::addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
- {
- error = LodePNG_InfoColor_addPalette(&infoPng.color, r, g, b, a);
- }
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- void Encoder::clearText()
- {
- LodePNG_Text_clear(&infoPng.text);
- }
-
- void Encoder::addText(const std::string& key, const std::string& str)
- {
- error = LodePNG_Text_add(&infoPng.text, key.c_str(), str.c_str());
- }
-
- void Encoder::clearIText()
- {
- LodePNG_IText_clear(&infoPng.itext);
- }
-
- void Encoder::addIText(const std::string& key, const std::string& langtag,
- const std::string& transkey, const std::string& str)
- {
- error = LodePNG_IText_add(&infoPng.itext, key.c_str(), langtag.c_str(), transkey.c_str(), str.c_str());
- }
-#endif //LODEPNG_COMPILE_ANCILLARY_CHUNKS
-
- const LodePNG_EncodeSettings& Encoder::getSettings() const
- {
- return settings;
- }
-
- LodePNG_EncodeSettings& Encoder::getSettings()
- {
- return settings;
- }
-
- void Encoder::setSettings(const LodePNG_EncodeSettings& settings)
- {
- this->settings = settings;
- }
-
- const LodePNG_InfoPng& Encoder::getInfoPng() const
- {
- return infoPng;
- }
-
- LodePNG_InfoPng& Encoder::getInfoPng()
- {
- return infoPng;
- }
-
- void Encoder::setInfoPng(const LodePNG_InfoPng& info)
- {
- error = LodePNG_InfoPng_copy(&this->infoPng, &info);
- }
-
- void Encoder::swapInfoPng(LodePNG_InfoPng& info)
- {
- LodePNG_InfoPng_swap(&this->infoPng, &info);
- }
-
- const LodePNG_InfoRaw& Encoder::getInfoRaw() const
- {
- return infoRaw;
- }
-
- LodePNG_InfoRaw& Encoder::getInfoRaw()
- {
- return infoRaw;
- }
-
- void Encoder::setInfoRaw(const LodePNG_InfoRaw& info)
- {
- error = LodePNG_InfoRaw_copy(&this->infoRaw, &info);
- }
-#endif //LODEPNG_COMPILE_ENCODER
-
- /* ////////////////////////////////////////////////////////////////////////// */
-
-#ifdef LODEPNG_COMPILE_DECODER
-
- unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in,
- size_t insize, unsigned colorType, unsigned bitDepth)
- {
- Decoder decoder;
- decoder.getInfoRaw().color.colorType = colorType;
- decoder.getInfoRaw().color.bitDepth = bitDepth;
- decoder.decode(out, in, insize);
- w = decoder.getWidth();
- h = decoder.getHeight();
- return decoder.getError();
- }
-
- unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
- const std::vector<unsigned char>& in, unsigned colorType, unsigned bitDepth)
- {
- return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colorType, bitDepth);
- }
-
-#ifdef LODEPNG_COMPILE_DISK
- unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename,
- unsigned colorType, unsigned bitDepth)
- {
- std::vector<unsigned char> buffer;
- loadFile(buffer, filename);
- return decode(out, w, h, buffer, colorType, bitDepth);
- }
-#endif //LODEPNG_COMPILE_DECODER
-#endif //LODEPNG_COMPILE_DISK
-
-#ifdef LODEPNG_COMPILE_ENCODER
-
- unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h,
- unsigned colorType, unsigned bitDepth)
- {
- Encoder encoder;
- encoder.getInfoRaw().color.colorType = colorType;
- encoder.getInfoRaw().color.bitDepth = bitDepth;
- encoder.getInfoPng().color.colorType = colorType;
- encoder.getInfoPng().color.bitDepth = bitDepth;
- encoder.encode(out, in, w, h);
- return encoder.getError();
- }
-
- unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h,
- unsigned colorType, unsigned bitDepth)
- {
- return encode(out, in.empty() ? 0 : &in[0], w, h, colorType, bitDepth);
- }
-
-#ifdef LODEPNG_COMPILE_DISK
- unsigned encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h,
- unsigned colorType, unsigned bitDepth)
- {
- std::vector<unsigned char> buffer;
- Encoder encoder;
- encoder.getInfoRaw().color.colorType = colorType;
- encoder.getInfoRaw().color.bitDepth = bitDepth;
- encoder.encode(buffer, in, w, h);
- if(!encoder.hasError()) saveFile(buffer, filename);
- return encoder.getError();
- }
-
- unsigned encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h,
- unsigned colorType, unsigned bitDepth)
- {
- return encode(filename, in.empty() ? 0 : &in[0], w, h, colorType, bitDepth);
- }
-#endif //LODEPNG_COMPILE_DISK
-#endif //LODEPNG_COMPILE_ENCODER
-#endif //LODEPNG_COMPILE_PNG
-} //namespace LodePNG
-#endif /*__cplusplus C++ RAII wrapper*/
diff --git a/tests/lodepng.h b/tests/lodepng.h
deleted file mode 100644
index a0a654f..0000000
--- a/tests/lodepng.h
+++ /dev/null
@@ -1,1899 +0,0 @@
-#ifndef LODEPNG_H_
-#define LODEPNG_H_
-
-/*
-LodePNG version 20110908
-
-Copyright (c) 2005-2011 Lode Vandevenne
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
-
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
-
- 3. This notice may not be removed or altered from any source
- distribution.
-*/
-
-#ifndef LODEPNG_H
-#define LODEPNG_H
-
-#include <string.h> /*for size_t*/
-
-#ifdef __cplusplus
-#include <vector>
-#include <string>
-#endif /*__cplusplus*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* Code Sections */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-The following #defines are used to create code sections. They can be disabled
-to disable code sections, which can give faster compile time and smaller binary.
-*/
-
-/*deflate&zlib encoder and deflate&zlib decoder.
-If this is disabled, you need to implement the dummy LodePNG_zlib_compress and
-LodePNG_zlib_decompress functions in the #else belonging to this #define in the
-source file.*/
-#define LODEPNG_COMPILE_ZLIB
-/*png encoder and png decoder*/
-#define LODEPNG_COMPILE_PNG
-/*deflate&zlib decoder and png decoder*/
-#define LODEPNG_COMPILE_DECODER
-/*deflate&zlib encoder and png encoder*/
-#define LODEPNG_COMPILE_ENCODER
-/*the optional built in harddisk file loading and saving functions*/
-#define LODEPNG_COMPILE_DISK
-/*any code or struct datamember related to chunks other than IHDR, IDAT, PLTE, tRNS, IEND*/
-#define LODEPNG_COMPILE_ANCILLARY_CHUNKS
-/*handling of unknown chunks*/
-#define LODEPNG_COMPILE_UNKNOWN_CHUNKS
-/*ability to convert error numerical codes to English text string*/
-#define LODEPNG_COMPILE_ERROR_TEXT
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* Simple Functions */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-This are the simple C and C++ functions, which cover basic usage.
-Further on in the header file are the more advanced functions allowing custom behaviour.
-*/
-
-#ifdef LODEPNG_COMPILE_PNG
-
-/*constants for the PNG color types. "LCT" = "LodePNG Color Type"*/
-#define LCT_GREY 0 /*PNG color type greyscale*/
-#define LCT_RGB 2 /*PNG color type RGB*/
-#define LCT_PALETTE 3 /*PNG color type palette*/
-#define LCT_GREY_ALPHA 4 /*PNG color type greyscale with alpha*/
-#define LCT_RGBA 6 /*PNG color type RGB with alpha*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-/*
-Converts PNG data in memory to raw pixel data.
-out: Output parameter. Pointer to buffer that will contain the raw pixel data.
- Its size is w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
- Must be freed after usage with free(*out).
-w: Output parameter. Pointer to width of pixel data.
-h: Output parameter. Pointer to height of pixel data.
-in: Memory buffer with the PNG file.
-insize: size of the in buffer.
-colorType: the desired color type for the raw output image. See explanation on PNG color types.
-bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
-Return value: LodePNG error code (0 means no error).
-*/
-unsigned LodePNG_decode(unsigned char** out, unsigned* w, unsigned* h,
- const unsigned char* in, size_t insize, unsigned colorType, unsigned bitDepth);
-
-/*Same as LodePNG_decode, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBA)*/
-unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h,
- const unsigned char* in, size_t insize);
-
-/*Same as LodePNG_decode, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB)*/
-unsigned LodePNG_decode24(unsigned char** out, unsigned* w, unsigned* h,
- const unsigned char* in, size_t insize);
-
-#ifdef LODEPNG_COMPILE_DISK
-/*
-Load PNG from disk, from file with given name.
-out: Output parameter. Pointer to buffer that will contain the raw pixel data.
- Its size is w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
- Must be freed after usage with free(*out).
-w: Output parameter. Pointer to width of pixel data.
-h: Output parameter. Pointer to height of pixel data.
-filename: Path on disk of the PNG file.
-colorType: the desired color type for the raw output image. See explanation on PNG color types.
-bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
-Return value: LodePNG error code (0 means no error).
-*/
-unsigned LodePNG_decode_file(unsigned char** out, unsigned* w, unsigned* h,
- const char* filename, unsigned colorType, unsigned bitDepth);
-
-/*Same as LodePNG_decode_file, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBA)*/
-unsigned LodePNG_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename);
-
-/*Same as LodePNG_decode_file, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB)*/
-unsigned LodePNG_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename);
-
-
-#endif /*LODEPNG_COMPILE_DISK*/
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/*
-Converts raw pixel data into a PNG image in memory. The colorType and bitDepth
- of the output PNG image cannot be chosen, they are automatically determined
- by the colorType, bitDepth and content of the input pixel data.
-out: Output parameter. Pointer to buffer that will contain the raw pixel data.
- Must be freed after usage with free(*out).
-outsize: Output parameter. Pointer to the size in bytes of the out buffer.
-image: The raw pixel data to encode. The size of this buffer should be
- w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
-w: width of the raw pixel data in pixels.
-h: height of the raw pixel data in pixels.
-colorType: the color type of the raw input image. See explanation on PNG color types.
-bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
-Return value: LodePNG error code (0 means no error).
-*/
-unsigned LodePNG_encode(unsigned char** out, size_t* outsize,
- const unsigned char* image, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth);
-
-/*Same as LodePNG_encode, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBA).*/
-unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h);
-
-/*Same as LodePNG_encode, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB).*/
-unsigned LodePNG_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h);
-
-#ifdef LODEPNG_COMPILE_DISK
-
-/*
-Converts raw pixel data into a PNG file on disk. Same as LodePNG_encode, but
-outputs to disk instead of memory buffer.
-filename: path to file on disk to write the PNG image to.
-image: The raw pixel data to encode. The size of this buffer should be
- w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
-w: width of the raw pixel data in pixels.
-h: height of the raw pixel data in pixels.
-colorType: the color type of the raw input image. See explanation on PNG color types.
-bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
-Return value: LodePNG error code (0 means no error).
-*/
-unsigned LodePNG_encode_file(const char* filename, const unsigned char* image,
- unsigned w, unsigned h, unsigned colorType, unsigned bitDepth);
-
-/*Same as LodePNG_encode_file, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBS).*/
-unsigned LodePNG_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h);
-
-/*Same as LodePNG_encode_file, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB).*/
-unsigned LodePNG_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h);
-#endif /*LODEPNG_COMPILE_DISK*/
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#ifdef __cplusplus
-namespace LodePNG
-{
-
-#ifdef LODEPNG_COMPILE_DECODER
- /*
- Converts PNG data in memory to raw pixel data.
- out: Output parameter, std::vector containing the raw pixel data. Its size
- will be w * h * (bytes per pixel), where bytes per pixel is 4 if the default
- colorType=6 and bitDepth=8 is used. The pixels are 32-bit RGBA bit in that case.
- w: Output parameter, width of the image in pixels.
- h: Output parameter, height of the image in pixels.
- in: Memory buffer with the PNG file.
- insize: size of the in buffer.
- colorType: the desired color type for the raw output image. See explanation on PNG color types.
- bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
- Return value: LodePNG error code (0 means no error).
- */
- unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
- const unsigned char* in, size_t insize, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-
- /*
- Same as the decode function that takes a unsigned char buffer, but instead of giving
- a pointer and a size, this takes the input buffer as an std::vector.
- */
- unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
- const std::vector<unsigned char>& in, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-#ifdef LODEPNG_COMPILE_DISK
- /*
- Converts PNG file from disk to raw pixel data in memory.
- out: Output parameter, std::vector containing the raw pixel data. Its size
- will be w * h * (bytes per pixel), where bytes per pixel is 4 if the default
- colorType=6 and bitDepth=8 is used. The pixels are 32-bit RGBA bit in that case.
- w: Output parameter, width of the image in pixels.
- h: Output parameter, height of the image in pixels.
- filename: Path to PNG file on disk.
- colorType: the desired color type for the raw output image. See explanation on PNG color types.
- bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
- Return value: LodePNG error code (0 means no error).
- */
- unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
- const std::string& filename, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-#endif //LODEPNG_COMPILE_DISK
-#endif //LODEPNG_COMPILE_DECODER
-
-#ifdef LODEPNG_COMPILE_ENCODER
- /*
- Converts 32-bit RGBA raw pixel data into a PNG image in memory.
- out: Output parameter, std::vector containing the PNG image data.
- in: Memory buffer with raw pixel data. The size of this buffer should be
- w * h * (bytes per pixel), With the default colorType=6 and bitDepth=8, bytes
- per pixel should be 4 and the data is a 32-bit RGBA pixel buffer.
- w: Width of the image in pixels.
- h: Height of the image in pixels.
- colorType: the color type of the raw input image. See explanation on PNG color types.
- bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
- Return value: LodePNG error code (0 means no error).
- */
- unsigned encode(std::vector<unsigned char>& out, const unsigned char* in,
- unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-
- /*
- Same as the encode function that takes a unsigned char buffer, but instead of giving
- a pointer and a size, this takes the input buffer as an std::vector.
- */
- unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
- unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-#ifdef LODEPNG_COMPILE_DISK
- /*
- Converts 32-bit RGBA raw pixel data into a PNG file on disk.
- filename: Path to the file to write the PNG image to.
- in: Memory buffer with raw pixel data. The size of this buffer should be
- w * h * (bytes per pixel), With the default colorType=6 and bitDepth=8, bytes
- per pixel should be 4 and the data is a 32-bit RGBA pixel buffer.
- w: Width of the image in pixels.
- h: Height of the image in pixels.
- colorType: the color type of the raw input image. See explanation on PNG color types.
- bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
- Return value: LodePNG error code (0 means no error).
- */
- unsigned encode(const std::string& filename, const unsigned char* in,
- unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-
- /*
- Same as the encode function that takes a unsigned char buffer, but instead of giving
- a pointer and a size, this takes the input buffer as an std::vector.
- */
- unsigned encode(const std::string& filename, const std::vector<unsigned char>& in,
- unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
-#endif //LODEPNG_COMPILE_DISK
-#endif //LODEPNG_COMPILE_ENCODER
-} //namespace LodePNG
-#endif /*__cplusplus*/
-#endif /*LODEPNG_COMPILE_PNG*/
-
-#ifdef LODEPNG_COMPILE_ERROR_TEXT
-/*
-Returns a textual description of the error code, in English. The
-numerical value of the code itself is not included in this description.
-*/
-const char* LodePNG_error_text(unsigned code);
-#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* Inflate & Deflate Setting Structs */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-These structs contain settings for the decompression and compression of the
-PNG files. Typically you won't need these directly.
-*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-typedef struct LodePNG_DecompressSettings
-{
- unsigned ignoreAdler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/
-} LodePNG_DecompressSettings;
-
-extern const LodePNG_DecompressSettings LodePNG_defaultDecompressSettings;
-void LodePNG_DecompressSettings_init(LodePNG_DecompressSettings* settings);
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/*
-Compression settings. Tweaking these settings tweaks the balance between
-speed and compression ratio.
-*/
-typedef struct LodePNG_CompressSettings /*deflate = compress*/
-{
- /*LZ77 related settings*/
- unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/
- unsigned useLZ77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
- unsigned windowSize; /*the maximum is 32768, higher gives more compression but is slower. Typical value: 2048.*/
-} LodePNG_CompressSettings;
-
-extern const LodePNG_CompressSettings LodePNG_defaultCompressSettings;
-void LodePNG_CompressSettings_init(LodePNG_CompressSettings* settings);
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-#ifdef LODEPNG_COMPILE_PNG
-/* ////////////////////////////////////////////////////////////////////////// */
-/* PNG and Raw Image Information Structs */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-Info about the color type of an image.
-The same LodePNG_InfoColor struct is used for both the PNG and raw image type,
-even though they are two totally different things.
-*/
-typedef struct LodePNG_InfoColor
-{
- /*header (IHDR)*/
- unsigned colorType; /*color type, see PNG standard or documentation further in this header file*/
- unsigned bitDepth; /*bits per sample, see PNG standard or documentation further in this header file*/
-
- /*
- palette (PLTE and tRNS)
-
- This is a dynamically allocated unsigned char array with the colors of the palette, including alpha.
- The value palettesize indicates the amount of colors in the palette.
- The allocated size of the buffer is 4 * palettesize bytes, in order RGBARGBARGBA...
-
- When encoding a PNG, to store your colors in the palette of the LodePNG_InfoRaw, first use
- LodePNG_InfoColor_clearPalette, then for each color use LodePNG_InfoColor_addPalette.
-
- If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette.
-
- When decoding, by default you can ignore this palette, since LodePNG already
- fills the palette colors in the pixels of the raw RGBA output.
- */
- unsigned char* palette; /*palette in RGBARGBA... order*/
- size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/
-
- /*
- transparent color key (tRNS)
- This color uses the same bit depth as the bitDepth value in this struct, which can be 1-bit to 16-bit.
- For greyscale PNGs, r, g and b will all 3 be set to the same.
-
- When decoding, by default you can ignore this information, since LodePNG sets
- pixels with this key to transparent already in the raw RGBA output.
- */
- unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/
- unsigned key_r; /*red/greyscale component of color key*/
- unsigned key_g; /*green component of color key*/
- unsigned key_b; /*blue component of color key*/
-} LodePNG_InfoColor;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_InfoColor_init(LodePNG_InfoColor* info);
-void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info);
-/*return value is error code (0 means no error)*/
-unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source);
-
-void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info);
-/*add 1 color to the palette*/
-unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info, unsigned char r,
- unsigned char g, unsigned char b, unsigned char a);
-
-/*additional color info*/
-
-/*get the total amount of bits per pixel, based on colorType and bitDepth in the struct*/
-unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info);
-/*get the amount of color channels used, based on colorType in the struct.
-If a palette is used, it counts as 1 channel.*/
-unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info);
-/*is it a greyscale type? (only colorType 0 or 4)*/
-unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info);
-/*has it got an alpha channel? (only colorType 2 or 6)*/
-unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info);
-/*has it got a palette? (only colorType 3)*/
-unsigned LodePNG_InfoColor_isPaletteType(const LodePNG_InfoColor* info);
-/*only returns true if there is a palette and there is a value in the palette with alpha < 255.
-Loops through the palette to check this.*/
-unsigned LodePNG_InfoColor_hasPaletteAlpha(const LodePNG_InfoColor* info);
-
-/*
-Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image.
-Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels).
-Returns false if the image can only have opaque pixels.
-In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values,
-or if "key_defined" is true.
-*/
-unsigned LodePNG_InfoColor_canHaveAlpha(const LodePNG_InfoColor* info);
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
-/*
-The information of a Time chunk in PNG.
-To make the encoder add a time chunk, set time_defined to 1 and fill in
-the correct values in all the time parameters. LodePNG will not fill the current
-time in these values itself, all it does is copy them over into the chunk bytes.
-*/
-typedef struct LodePNG_Time
-{
- unsigned year; /*2 bytes used (0-65535)*/
- unsigned char month; /*1-12*/
- unsigned char day; /*1-31*/
- unsigned char hour; /*0-23*/
- unsigned char minute; /*0-59*/
- unsigned char second; /*0-60 (to allow for leap seconds)*/
-} LodePNG_Time;
-
-/*
-Info about text chunks in a PNG file. The arrays can contain multiple keys
-and strings. The amount of keys and strings is the same. The amount of strings
-ends when the pointer to the string is a null pointer.
-
-They keyword of text chunks gives a short description what the actual text
-represents. There are a few standard standard keywords recognised
-by many programs: Title, Author, Description, Copyright, Creation Time,
-Software, Disclaimer, Warning, Source, Comment. It's allowed to use other keys.
-
-A keyword is minimum 1 character and maximum 79 characters long. It's
-discouraged to use a single line length longer than 79 characters for texts.
-*/
-typedef struct LodePNG_Text /*non-international text*/
-{
- /*Don't allocate these text buffers yourself. Use the init/cleanup functions
- correctly and use LodePNG_Text_add and LodePNG_Text_clear.*/
- size_t num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/
- char** keys; /*the keyword of a text chunk (e.g. "Comment")*/
- char** strings; /*the actual text*/
-} LodePNG_Text;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_Text_init(LodePNG_Text* text);
-void LodePNG_Text_cleanup(LodePNG_Text* text);
-/*return value is error code (0 means no error)*/
-unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source);
-
-/*Use these functions instead of allocating the char**s manually*/
-void LodePNG_Text_clear(LodePNG_Text* text); /*use this to clear the texts again after you filled them in*/
-unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str); /*push back both texts at once*/
-
-/*
-Info about international text chunks in a PNG file. The arrays can contain multiple keys
-and strings. The amount of keys, lengtags, transkeys and strings is the same.
-The amount of strings ends when the pointer to the string is a null pointer.
-
-A keyword is minimum 1 character and maximum 79 characters long. It's
-discouraged to use a single line length longer than 79 characters for texts.
-*/
-typedef struct LodePNG_IText /*international text*/
-{
- /*Don't allocate these text buffers yourself. Use the init/cleanup functions
- correctly and use LodePNG_IText_add and LodePNG_IText_clear.*/
-
- /*the amount of international texts in this PNG*/
- size_t num;
- /*the English keyword of the text chunk (e.g. "Comment")*/
- char** keys;
- /*the language tag for this text's international language, ISO/IEC 646 string, e.g. ISO 639 language tag*/
- char** langtags;
- /*keyword translated to the international language - UTF-8 string*/
- char** transkeys;
- /*the actual international text - UTF-8 string*/
- char** strings;
-} LodePNG_IText;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_IText_init(LodePNG_IText* text);
-void LodePNG_IText_cleanup(LodePNG_IText* text);
-/*return value is error code (0 means no error)*/
-unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source);
-
-/*Use these functions instead of allocating the char**s manually*/
-void LodePNG_IText_clear(LodePNG_IText* text); /*use this to clear the itexts again after you filled them in*/
-unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag,
- const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
-/*
-Unknown chunks read from the PNG, or extra chunks the user wants to have added
-in the encoded PNG.
-*/
-typedef struct LodePNG_UnknownChunks
-{
- /*There are 3 buffers, one for each position in the PNG where unknown chunks can appear
- each buffer contains all unknown chunks for that position consecutively
- The 3 buffers are the unknown chunks between certain critical chunks:
- 0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND
-
- Do not allocate or traverse this data yourself. Use the chunk traversing functions declared
- later, such as LodePNG_chunk_next and LodePNG_append_chunk, to read/write this struct.
- */
- unsigned char* data[3];
- size_t datasize[3]; /*size in bytes of the unknown chunks, given for protection*/
-
-} LodePNG_UnknownChunks;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks);
-void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks);
-/*return value is error code (0 means no error)*/
-unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src);
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-
-/*
-Information about the PNG image, except pixels and sometimes except width and height.
-*/
-typedef struct LodePNG_InfoPng
-{
- /*header (IHDR), palette (PLTE) and transparency (tRNS)*/
-
- /*
- Note: width and height are only used as information of a decoded PNG image. When encoding one, you don't have
- to specify width and height in an LodePNG_Info struct, but you give them as parameters of the encode function.
- The rest of the LodePNG_Info struct IS used by the encoder though!
- */
- unsigned width; /*width of the image in pixels (ignored by encoder, but filled in by decoder)*/
- unsigned height; /*height of the image in pixels (ignored by encoder, but filled in by decoder)*/
- unsigned compressionMethod; /*compression method of the original file. Always 0.*/
- unsigned filterMethod; /*filter method of the original file*/
- unsigned interlaceMethod; /*interlace method of the original file*/
- LodePNG_InfoColor color; /*color type and bits, palette and transparency of the PNG file*/
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- /*
- suggested background color (bKGD)
- This color uses the same bit depth as the bitDepth value in this struct, which can be 1-bit to 16-bit.
-
- For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding
- the encoder writes the red one. For palette PNGs: When decoding, the RGB value
- will be stored, not a palette index. But when encoding, specify the index of
- the palette in background_r, the other two are then ignored.
-
- The decoder does not use this background color to edit the color of pixels.
- */
- unsigned background_defined; /*is a suggested background color given?*/
- unsigned background_r; /*red component of suggested background color*/
- unsigned background_g; /*green component of suggested background color*/
- unsigned background_b; /*blue component of suggested background color*/
-
- /*non-international text chunks (tEXt and zTXt)*/
- LodePNG_Text text;
-
- /*international text chunks (iTXt)*/
- LodePNG_IText itext;
-
- /*time chunk (tIME)*/
- unsigned char time_defined; /*if 0, no tIME chunk was or will be generated in the PNG image*/
- LodePNG_Time time;
-
- /*phys chunk (pHYs)*/
- unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/
- unsigned phys_x; /*pixels per unit in x direction*/
- unsigned phys_y; /*pixels per unit in y direction*/
- unsigned char phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- /*unknown chunks*/
- LodePNG_UnknownChunks unknown_chunks;
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-} LodePNG_InfoPng;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_InfoPng_init(LodePNG_InfoPng* info);
-void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info);
-/*return value is error code (0 means no error)*/
-unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source);
-
-/*
-Contains user-chosen information about the raw image data, which is independent of the PNG image
-With raw images, I mean the image data in the form of the simple raw buffer to which the
-compressed PNG data is decoded, or from which a PNG image can be encoded.
-*/
-typedef struct LodePNG_InfoRaw
-{
- LodePNG_InfoColor color; /*color info of the raw image, note that the same struct as for PNG data is used.*/
-} LodePNG_InfoRaw;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info);
-void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info);
-/*return value is error code (0 means no error)*/
-unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source);
-
-/*
-Converts raw buffer from one color type to another color type, based on
-LodePNG_InfoColor structs to describe the input and output color type.
-See the reference manual at the end of this header file to see which color conversions are supported.
-return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported)
-The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
-of the output color type (LodePNG_InfoColor_getBpp)
-*/
-unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut,
- LodePNG_InfoColor* infoIn, unsigned w, unsigned h);
-
-#ifdef LODEPNG_COMPILE_DECODER
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* LodePNG Decoder */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-Settings for the decoder. This contains settings for the PNG and the Zlib
-decoder, but not the Info settings from the Info structs.
-*/
-typedef struct LodePNG_DecodeSettings
-{
- LodePNG_DecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
-
- unsigned ignoreCrc; /*ignore CRC checksums*/
- unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
-
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- unsigned readTextChunks; /*if false but rememberUnknownChunks is true, they're stored in the unknown chunks*/
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-
-#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
- /*store all bytes from unknown chunks in the InfoPng (off by default, useful for a png editor)*/
- unsigned rememberUnknownChunks;
-#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
-} LodePNG_DecodeSettings;
-
-void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings);
-
-/*
-The LodePNG_Decoder struct has most input and output parameters the decoder uses,
-such as the settings, the info of the PNG and the raw data, and the error. Only
-the pixel buffer is not contained in this struct.
-*/
-typedef struct LodePNG_Decoder
-{
- LodePNG_DecodeSettings settings; /*the decoding settings*/
- LodePNG_InfoRaw infoRaw; /*specifies the format in which you would like to get the raw pixel buffer*/
- LodePNG_InfoPng infoPng; /*info of the PNG image obtained after decoding*/
- unsigned error;
-} LodePNG_Decoder;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_Decoder_init(LodePNG_Decoder* decoder);
-void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder);
-void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source);
-
-/*
-Decode based on a LodePNG_Decoder.
-This function allocates the out buffer and stores the size in *outsize. This buffer
-needs to be freed after usage.
-Other information about the PNG file, such as the size, colorType and extra chunks
-are stored in the infoPng field of the LodePNG_Decoder.
-*/
-void LodePNG_Decoder_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize,
- const unsigned char* in, size_t insize);
-
-/*
-Read the PNG header, but not the actual data. This returns only the information
-that is in the header chunk of the PNG, such as width, height and color type. The
-information is placed in the infoPng field of the LodePNG_Decoder.
-*/
-void LodePNG_Decoder_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t insize);
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/* ////////////////////////////////////////////////////////////////////////// */
-/* LodePNG Encoder */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*Settings for the encoder.*/
-typedef struct LodePNG_EncodeSettings
-{
- LodePNG_CompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
-
- /*Brute-force-search PNG filters by compressing each filter for each scanline.
- This gives better compression, at the cost of being super slow.
- Don't enable this for normal image saving, compression can take minutes
- instead of seconds. This is experimental. If enabled, compression still isn't
- as good as some other PNG encoders and optimizers, except for some images.
- If you enable this, also consider setting zlibsettings.windowSize to 32768, and consider
- using a less than 24-bit per pixel colorType if the image has <= 256 colors, for optimal compression.
- Default: 0 (false)*/
- unsigned bruteForceFilters;
-
- /*automatically use color type without alpha instead of given one, if given image is opaque*/
- unsigned autoLeaveOutAlphaChannel;
- /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette).
- If colortype is 3, PLTE is _always_ created.*/
- unsigned force_palette;
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- /*add LodePNG version as text chunk*/
- unsigned add_id;
- /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/
- unsigned text_compression;
-#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
-} LodePNG_EncodeSettings;
-
-void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings);
-
-/*
-This struct has most input and output parameters the encoder uses,
-such as the settings, the info of the PNG and the raw data, and the error. Only
-the pixel buffer is not contained in this struct.
-*/
-typedef struct LodePNG_Encoder
-{
- /*compression settings of the encoder*/
- LodePNG_EncodeSettings settings;
- /*the info specified by the user is not changed by the encoder. The encoder
- will try to generate a PNG close to the given info.*/
- LodePNG_InfoPng infoPng;
- /*put the properties of the input raw image in here*/
- LodePNG_InfoRaw infoRaw;
- /*error value filled in if error happened, or 0 if all went ok*/
- unsigned error;
-} LodePNG_Encoder;
-
-/*init, cleanup and copy functions to use with this struct*/
-void LodePNG_Encoder_init(LodePNG_Encoder* encoder);
-void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder);
-void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source);
-
-/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/
-void LodePNG_Encoder_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize,
- const unsigned char* image, unsigned w, unsigned h);
-#endif /*LODEPNG_COMPILE_ENCODER*/
-
-/* ////////////////////////////////////////////////////////////////////////// */
-/* Chunk Traversing Utilities */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-LodePNG_chunk functions:
-These functions need as input a large enough amount of allocated memory.
-These functions can be used on raw PNG data, but they are exposed in the API
-because they are needed if you want to traverse the unknown chunks stored
-in the LodePNG_UnknownChunks struct, or add new ones to it.
-*/
-
-/*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/
-unsigned LodePNG_chunk_length(const unsigned char* chunk);
-
-/*puts the 4-byte type in null terminated string*/
-void LodePNG_chunk_type(char type[5], const unsigned char* chunk);
-
-/*check if the type is the given type*/
-unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type);
-
-/*
-These functions get properties of PNG chunks gotten from capitalization of chunk
-type name, as defined by the PNG standard.
-*/
-
-/*
-properties of PNG chunks gotten from capitalization of chunk type name, as defined by the standard
-0: ancillary chunk, 1: it's one of the critical chunk types
-*/
-unsigned char LodePNG_chunk_critical(const unsigned char* chunk);
-
-/*0: public, 1: private*/
-unsigned char LodePNG_chunk_private(const unsigned char* chunk);
-
-/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy*/
-unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk);
-
-/*get pointer to the data of the chunk*/
-unsigned char* LodePNG_chunk_data(unsigned char* chunk);
-
-/*get pointer to the data of the chunk*/
-const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk);
-
-/*returns 0 if the crc is correct, 1 if it's incorrect*/
-unsigned LodePNG_chunk_check_crc(const unsigned char* chunk);
-
-/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/
-void LodePNG_chunk_generate_crc(unsigned char* chunk);
-
-/*iterate to next chunks. don't use on IEND chunk, as there is no next chunk then*/
-unsigned char* LodePNG_chunk_next(unsigned char* chunk);
-const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk);
-
-/*
-Appends chunk to the data in out. The given chunk should already have its chunk header.
-The out variable and outlength are updated to reflect the new reallocated buffer.
-Returns error code (0 if it went ok)
-*/
-unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk);
-
-/*
-Appends new chunk to out. The chunk to append is given by giving its length, type
-and data separately. The type is a 4-letter string.
-The out variable and outlength are updated to reflect the new reallocated buffer.
-Returne error code (0 if it went ok)
-*/
-unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length,
- const char* type, const unsigned char* data);
-#endif /*LODEPNG_COMPILE_PNG*/
-
-#ifdef LODEPNG_COMPILE_ZLIB
-/* ////////////////////////////////////////////////////////////////////////// */
-/* Zlib encoder and decoder */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-/*
-This zlib part can be used independently to zlib compress and decompress a
-buffer. It cannot be used to create gzip files however, and it only supports the
-part of zlib that is required for PNG, it does not support dictionaries.
-*/
-
-#ifdef LODEPNG_COMPILE_DECODER
-/*Decompresses Zlib data. Reallocates the out buffer and appends the data. The
-data must be according to the zlib specification.
-Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
-buffer and *outsize its size in bytes. out must be freed by user after usage.*/
-unsigned LodePNG_zlib_decompress(unsigned char** out, size_t* outsize,
- const unsigned char* in, size_t insize, const LodePNG_DecompressSettings* settings);
-#endif /*LODEPNG_COMPILE_DECODER*/
-
-#ifdef LODEPNG_COMPILE_ENCODER
-/*Compresses data with Zlib. Reallocates the out buffer and appends the data.
-The data is output in the format of the zlib specification.
-Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
-buffer and *outsize its size in bytes. out must be freed by user after usage.*/
-unsigned LodePNG_zlib_compress(unsigned char** out, size_t* outsize,
- const unsigned char* in, size_t insize, const LodePNG_CompressSettings* settings);
-#endif /*LODEPNG_COMPILE_ENCODER*/
-#endif /*LODEPNG_COMPILE_ZLIB*/
-
-#ifdef LODEPNG_COMPILE_DISK
-/*
-Load a file from disk into buffer. The function allocates the out buffer, and
-after usage you are responsible for freeing it.
-out: output parameter, contains pointer to loaded buffer.
-outsize: output parameter, size of the allocated out buffer
-filename: the path to the file to load
-return value: error code (0 means ok)
-*/
-unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename);
-
-/*
-Save a file from buffer to disk. Warning, if it exists, this function overwrites
-the file without warning!
-buffer: the buffer to write
-buffersize: size of the buffer to write
-filename: the path to the file to save to
-return value: error code (0 means ok)
-*/
-unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename);
-#endif /*LODEPNG_COMPILE_DISK*/
-
-#ifdef __cplusplus
-/* ////////////////////////////////////////////////////////////////////////// */
-/* LodePNG C++ wrapper */
-/* ////////////////////////////////////////////////////////////////////////// */
-
-//The LodePNG C++ wrapper uses classes with handy constructors and destructors
-//instead of manual init and cleanup functions, and uses std::vectors instead of
-//manually allocated memory buffers.
-
-namespace LodePNG
-{
-#ifdef LODEPNG_COMPILE_ZLIB
-//The C++ wrapper for the zlib part
-#ifdef LODEPNG_COMPILE_DECODER
- //Zlib-decompress an unsigned char buffer
- unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
- const LodePNG_DecompressSettings& settings = LodePNG_defaultDecompressSettings);
-
- //Zlib-decompress an std::vector
- unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
- const LodePNG_DecompressSettings& settings = LodePNG_defaultDecompressSettings);
-#endif //LODEPNG_COMPILE_DECODER
-
-#ifdef LODEPNG_COMPILE_ENCODER
- //Zlib-compress an unsigned char buffer
- unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
- const LodePNG_CompressSettings& settings = LodePNG_defaultCompressSettings);
-
- //Zlib-compress an std::vector
- unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
- const LodePNG_CompressSettings& settings = LodePNG_defaultCompressSettings);
-#endif //LODEPNG_COMPILE_ENCODER
-#endif //LODEPNG_COMPILE_ZLIB
-
-#ifdef LODEPNG_COMPILE_PNG
-#ifdef LODEPNG_COMPILE_DECODER
- /*
- Class to decode a PNG image. Before decoding, settings can be set and
- after decoding, extra information about the PNG can be retrieved.
- Extends from the C-struct LodePNG_Decoder to add constructors and destructors
- to initialize/cleanup it automatically. Beware, no virtual destructor is used.
- */
- class Decoder : public LodePNG_Decoder
- {
- public:
-
- Decoder();
- ~Decoder();
- void operator=(const LodePNG_Decoder& other);
-
- //decode PNG buffer to raw out buffer. Width and height can be retrieved with getWidth() and
- //getHeight() and error should be checked with hasError() and getError()
- void decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize);
-
- //decode PNG buffer to raw out buffer. Width and height can be retrieved with getWidth() and
- //getHeight() and error should be checked with hasError() and getError()
- void decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in);
-
- //inspect functions: get only the info from the PNG header. The info can then be retrieved with
- //the functions of this class.
- void inspect(const unsigned char* in, size_t insize);
-
- //inspect functions: get only the info from the PNG header. The info can then be retrieved with
- //the functions of this class.
- void inspect(const std::vector<unsigned char>& in);
-
- //error checking after decoding
- bool hasError() const;
- unsigned getError() const;
-
- //convenient access to some InfoPng parameters after decoding
- unsigned getWidth() const; //width of image in pixels
- unsigned getHeight() const; //height of image in pixels
- unsigned getBpp(); //bits per pixel
- unsigned getChannels(); //amount of channels
- unsigned isGreyscaleType(); //is it a greyscale type? (colorType 0 or 4)
- unsigned isAlphaType(); //has it an alpha channel? (colorType 2 or 6)
-
- //getters and setters for the decoding settings
- const LodePNG_DecodeSettings& getSettings() const;
- LodePNG_DecodeSettings& getSettings();
- void setSettings(const LodePNG_DecodeSettings& info);
-
- //getters and setters for the PNG image info, after decoding this describes information of the PNG image
- const LodePNG_InfoPng& getInfoPng() const;
- LodePNG_InfoPng& getInfoPng();
- void setInfoPng(const LodePNG_InfoPng& info);
- void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng
-
- //getters and setters for the raw image info, this determines in what format
- //you get the pixel buffer from the decoder
- const LodePNG_InfoRaw& getInfoRaw() const;
- LodePNG_InfoRaw& getInfoRaw();
- void setInfoRaw(const LodePNG_InfoRaw& info);
- };
-#endif //LODEPNG_COMPILE_DECODER
-
-#ifdef LODEPNG_COMPILE_ENCODER
- /*
- Class to encode a PNG image. Before encoding, settings can be set.
- Extends from the C-struct LodePNG_Enoder to add constructors and destructors
- to initialize/cleanup it automatically. Beware, no virtual destructor is used.
- */
- class Encoder : public LodePNG_Encoder
- {
- public:
-
- Encoder();
- ~Encoder();
- void operator=(const LodePNG_Encoder& other);
-
- //encoding image to PNG buffer
- void encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h);
-
- //encoding image to PNG buffer
- void encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image, unsigned w, unsigned h);
-
- //error checking after decoding
- bool hasError() const;
- unsigned getError() const;
-
- //convenient direct access to some parameters of the InfoPng
- void clearPalette();
- void addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a); //add 1 color to the palette
-#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
- void clearText();
- void addText(const std::string& key, const std::string& str); //push back both texts at once
- void clearIText();
- void addIText(const std::string& key, const std::string& langtag,
- const std::string& transkey, const std::string& str);
-#endif //LODEPNG_COMPILE_ANCILLARY_CHUNKS
-
- //getters and setters for the encoding settings
- const LodePNG_EncodeSettings& getSettings() const;
- LodePNG_EncodeSettings& getSettings();
- void setSettings(const LodePNG_EncodeSettings& info);
-
- //getters and setters for the PNG image info, this describes what color type
- //and other settings the resulting PNG should have
- const LodePNG_InfoPng& getInfoPng() const;
- LodePNG_InfoPng& getInfoPng();
- void setInfoPng(const LodePNG_InfoPng& info);
- void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng
-
- //getters and setters for the raw image info, this describes how the encoder
- //should interpret the input pixel buffer
- const LodePNG_InfoRaw& getInfoRaw() const;
- LodePNG_InfoRaw& getInfoRaw();
- void setInfoRaw(const LodePNG_InfoRaw& info);
- };
-#endif //LODEPNG_COMPILE_ENCODER
-
-#ifdef LODEPNG_COMPILE_DISK
- /*
- Load a file from disk into an std::vector. If the vector is empty, then either
- the file doesn't exist or is an empty file.
- */
- void loadFile(std::vector<unsigned char>& buffer, const std::string& filename);
-
- /*
- Save the binary data in an std::vector to a file on disk. The file is overwritten
- without warning.
- */
- void saveFile(const std::vector<unsigned char>& buffer, const std::string& filename);
-#endif //LODEPNG_COMPILE_DISK
-#endif //LODEPNG_COMPILE_PNG
-} //namespace LodePNG
-#endif /*end of __cplusplus wrapper*/
-
-/*
-TODO:
-[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often
-[.] check compatibility with vareous compilers - done but needs to be redone for every newer version
-[ ] LZ77 encoder more like the one described in zlib - to make sure it's patentfree
-[X] converting color to 16-bit per channel types
-[ ] read all public PNG chunk types (but never let the color profile and gamma ones touch RGB values)
-[ ] make sure encoder generates no chunks with size > (2^31)-1
-[ ] partial decoding (stream processing)
-[ ] let the "isFullyOpaque" function check color keys and transparent palettes too
-[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
-[ ] don't stop decoding on errors like 69, 57, 58 (make warnings)
-[ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not
-[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes
-*/
-
-#endif /*LODEPNG_H inclusion guard*/
-
-/*
-LodePNG Documentation
----------------------
-
-This documentations contains background information and examples. For the function
-and class documentation, see the comments in the declarations above.
-
-0. table of contents
---------------------
-
- 1. about
- 1.1. supported features
- 1.2. features not supported
- 2. C and C++ version
- 3. security
- 4. decoding
- 5. encoding
- 6. color conversions
- 6.1. PNG color types
- 6.2. Default Behaviour of LodePNG
- 6.3. Color Conversions
- 6.4. More Notes
- 7. error values
- 8. chunks and PNG editing
- 9. compiler support
- 10. examples
- 10.1. decoder C++ example
- 10.2. encoder C++ example
- 10.3. decoder C example
- 11. changes
- 12. contact information
-
-
-1. about
---------
-
-PNG is a file format to store raster images losslessly with good compression,
-supporting different color types. It can be implemented in a patent-free way.
-
-LodePNG is a PNG codec according to the Portable Network Graphics (PNG)
-Specification (Second Edition) - W3C Recommendation 10 November 2003.
-
-The specifications used are:
-
-*) Portable Network Graphics (PNG) Specification (Second Edition):
- http://www.w3.org/TR/2003/REC-PNG-20031110
-*) RFC 1950 ZLIB Compressed Data Format version 3.3:
- http://www.gzip.org/zlib/rfc-zlib.html
-*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3:
- http://www.gzip.org/zlib/rfc-deflate.html
-
-The most recent version of LodePNG can currently be found at
-http://members.gamedev.net/lode/projects/LodePNG/
-
-LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds
-extra functionality.
-
-LodePNG exists out of two files:
--lodepng.h: the header file for both C and C++
--lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage
-
-If you want to start using LodePNG right away without reading this doc, get the
-files lodepng_examples.c or lodepng_examples.cpp to see how to use it in code,
-or check the (smaller) examples in chapter 13 here.
-
-LodePNG is simple but only supports the basic requirements. To achieve
-simplicity, the following design choices were made: There are no dependencies
-on any external library. To decode PNGs, there's a Decoder struct or class that
-can convert any PNG file data into an RGBA image buffer with a single function
-call. To encode PNGs, there's an Encoder struct or class that can convert image
-data into PNG file data with a single function call. To read and write files,
-there are simple functions to convert the files to/from buffers in memory.
-
-This all makes LodePNG suitable for loading textures in games, demoscene
-productions, saving a screenshot, images in programs that require them for simple
-usage, ... It's less suitable for full fledged image editors, loading PNGs
-over network (it requires all the image data to be available before decoding can
-begin), life-critical systems, ...
-LodePNG has a standards conformant decoder and encoder, and supports the ability
-to make a somewhat conformant editor.
-
-1.1. supported features
------------------------
-
-The following features are supported by the decoder:
-
-*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image,
- or the same color type as the PNG
-*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image
-*) Adam7 interlace and deinterlace for any color type
-*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk
-*) support for alpha channels, including RGBA color model, translucent palettes and color keying
-*) zlib decompression (inflate)
-*) zlib compression (deflate)
-*) CRC32 and ADLER32 checksums
-*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks.
-*) the following chunks are supported (generated/interpreted) by both encoder and decoder:
- IHDR: header information
- PLTE: color palette
- IDAT: pixel data
- IEND: the final chunk
- tRNS: transparency for palettized images
- tEXt: textual information
- zTXt: compressed textual information
- iTXt: international textual information
- bKGD: suggested background color
- pHYs: physical dimensions
- tIME: modification time
-
-1.2. features not supported
----------------------------
-
-The following features are _not_ supported:
-
-*) some features needed to make a conformant PNG-Editor might be still missing.
-*) partial loading/stream processing. All data must be available and is processed in one call.
-*) The following public chunks are not supported but treated as unknown chunks by LodePNG
- cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT
-
-
-2. C and C++ version
---------------------
-
-The C version uses buffers allocated with alloc that you need to free()
-yourself. On top of that, you need to use init and cleanup functions for each
-struct whenever using a struct from the C version to avoid exploits and memory leaks.
-
-The C++ version has constructors and destructors that take care of these things,
-and uses std::vectors in the interface for storing data.
-
-Both the C and the C++ version are contained in this file! The C++ code depends on
-the C code, the C code works on its own.
-
-These files work without modification for both C and C++ compilers because all the
-additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers ignore
-it, and the C code is made to compile both with strict ISO C90 and C++.
-
-To use the C++ version, you need to rename the source file to lodepng.cpp (instead
-of lodepng.c), and compile it with a C++ compiler.
-
-To use the C version, you need to rename the source file to lodepng.c (instead
-of lodepng.cpp), and compile it with a C compiler.
-
-
-3. Security
------------
-
-As with most software, even if carefully designed, it's always possible that
-LodePNG may contain possible exploits.
-
-If you discover a possible exploit, please let me know, and it will be fixed.
-
-When using LodePNG, care has to be taken with the C version of LodePNG, as well as the C-style
-structs when working with C++. The following conventions are used for all C-style structs:
-
--if a struct has a corresponding init function, always call the init function when making a new one, to avoid exploits
--if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks
--if a struct has a corresponding copy function, use the copy function instead of "=".
- The destination must also be inited already!
-
-4. Decoding
------------
-
-Decoding converts a PNG compressed image to a raw pixel buffer.
-
-Most documentation on using the decoder is at its declarations in the header
-above. For C, simple decoding can be done with functions such as LodePNG_decode32,
-and more advanced decoding can be done with the struct LodePNG_Decoder and its
-functions. For C++, simple decoding can be done with the LodePNG::decode functions
-and advanced decoding with the LodePNG::Decoder class.
-
-The Decoder contains 3 components:
-*) LodePNG_InfoPng: it stores information about the PNG (the input) in an LodePNG_InfoPng struct,
- don't modify this one yourself
-*) Settings: you can specify a few other settings for the decoder to use
-*) LodePNG_InfoRaw: here you can say what type of raw image (the output) you want to get
-
-Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color".
-In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their
-init and cleanup functions, but normally you use the ones in the decoder that are already handled
-in the init and cleanup functions of the decoder itself.
-
-=LodePNG_InfoPng=
-
-This contains information such as the original color type of the PNG image, text
-comments, suggested background color, etc... More details about the LodePNG_InfoPng struct
-are at its declaration documentation.
-
-Because the dimensions of the image are important, there are shortcuts to get them in the
-C++ version: use decoder.getWidth() and decoder.getHeight().
-In the C version, use decoder.infoPng.width and decoder.infoPng.height.
-
-=LodePNG_InfoRaw=
-
-In the LodePNG_InfoRaw struct of the Decoder, you can specify which color type you want
-the resulting raw image to be. If this is different from the colorType of the
-PNG, then the decoder will automatically convert the result to your LodePNG_InfoRaw
-settings. Not all combinations of color conversions are supported though, see
-a different section for information about the color modes and supported conversions.
-
-Palette of LodePNG_InfoRaw isn't used by the Decoder, when converting from palette color
-to palette color, the values of the pixels are left untouched so that the colors
-will change if the palette is different. Color key of LodePNG_InfoRaw is not used by the
-Decoder. If setting color_convert is false then LodePNG_InfoRaw is completely ignored,
-but it will be modified to match the color type of the PNG so will be overwritten.
-
-By default, 32-bit color is used for the result.
-
-=Settings=
-
-The Settings can be used to ignore the errors created by invalid CRC and Adler32
-chunks, and to disable the decoding of tEXt chunks.
-
-There's also a setting color_convert, true by default. If false, no conversion
-is done, the resulting data will be as it was in the PNG (after decompression)
-and you'll have to puzzle the colors of the pixels together yourself using the
-color type information in the LodePNG_InfoPng.
-
-
-5. Encoding
------------
-
-Encoding converts a raw pixel buffer to a PNG compressed image.
-
-Most documentation on using the encoder is at its declarations in the header
-above. For C, simple encoding can be done with functions such as LodePNG_encode32,
-and more advanced decoding can be done with the struct LodePNG_Encoder and its
-functions. For C++, simple encoding can be done with the LodePNG::encode functions
-and advanced decoding with the LodePNG::Encoder class.
-
-Like the decoder, the encoder can also give errors. However it gives less errors
-since the encoder input is trusted, the decoder input (a PNG image that could
-be forged by anyone) is not trusted.
-
-Like the Decoder, the Encoder has 3 components:
-*) LodePNG_InfoRaw: here you say what color type of the raw image (the input) has
-*) Settings: you can specify a few settings for the encoder to use
-*) LodePNG_InfoPng: the same LodePNG_InfoPng struct as created by the Decoder. For the encoder,
-with this you specify how you want the PNG (the output) to be.
-
-Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color".
-In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their
-init and cleanup functions, but normally you use the ones in the encoder that are already handled
-in the init and cleanup functions of the decoder itself.
-
-=LodePNG_InfoPng=
-
-The Decoder class stores information about the PNG image in an LodePNG_InfoPng object. With
-the Encoder you can do the opposite: you give it an LodePNG_InfoPng object, and it'll try
-to match the LodePNG_InfoPng you give as close as possible in the PNG it encodes. For
-example in the LodePNG_InfoPng you can specify the color type you want to use, possible
-tEXt chunks you want the PNG to contain, etc... For an explanation of all the
-values in LodePNG_InfoPng see a further section. Not all PNG color types are supported
-by the Encoder.
-
-The encoder will not always exactly match the LodePNG_InfoPng struct you give,
-it tries as close as possible. Some things are ignored by the encoder. The width
-and height of LodePNG_InfoPng are ignored as well, because instead the width and
-height of the raw image you give in the input are used. In fact the encoder
-currently uses only the following settings from it:
--colorType and bitDepth: the ones it supports
--text chunks, that you can add to the LodePNG_InfoPng with "addText"
--the color key, if applicable for the given color type
--the palette, if you encode to a PNG with colorType 3
--the background color: it'll add a bKGD chunk to the PNG if one is given
--the interlaceMethod: None (0) or Adam7 (1)
-
-When encoding to a PNG with colorType 3, the encoder will generate a PLTE chunk.
-If the palette contains any colors for which the alpha channel is not 255 (so
-there are translucent colors in the palette), it'll add a tRNS chunk.
-
-=LodePNG_InfoRaw=
-
-You specify the color type of the raw image that you give to the input here,
-including a possible transparent color key and palette you happen to be using in
-your raw image data.
-
-By default, 32-bit color is assumed, meaning your input has to be in RGBA
-format with 4 bytes (unsigned chars) per pixel.
-
-=Settings=
-
-The following settings are supported (some are in sub-structs):
-*) autoLeaveOutAlphaChannel: when this option is enabled, when you specify a PNG
-color type with alpha channel (not to be confused with the color type of the raw
-image you specify!!), but the encoder detects that all pixels of the given image
-are opaque, then it'll automatically use the corresponding type without alpha
-channel, resulting in a smaller PNG image.
-*) btype: the block type for LZ77.
- 0 = uncompressed, 1 = fixed huffman tree, 2 = dynamic huffman tree (best compression)
-*) useLZ77: whether or not to use LZ77 for compressed block types
-*) windowSize: the window size used by the LZ77 encoder (1 - 32768)
-*) force_palette: if colorType is 2 or 6, you can make the encoder write a PLTE
- chunk if force_palette is true. This can used as suggested palette to convert
- to by viewers that don't support more than 256 colors (if those still exist)
-*) add_id: add text chunk "Encoder: LodePNG <version>" to the image.
-*) text_compression: default 0. If 1, it'll store texts as zTXt instead of tEXt chunks.
- zTXt chunks use zlib compression on the text. This gives a smaller result on
- large texts but a larger result on small texts (such as a single program name).
- It's all tEXt or all zTXt though, there's no separate setting per text yet.
-
-
-6. color conversions
---------------------
-
-In LodePNG, the color mode (bits, channels and palette) used in the PNG image,
-and the color mode used in the raw data, are separate and independently
-configurable. Therefore, LodePNG needs to do conversions from one color mode to
-another. Not all possible conversions are supported (e.g. converting to a palette
-or a lower bit depth isn't supported). This section will explain which conversions
-are supported and how to configure this. This explains for example when LodePNG
-uses the settings in LodePNG_InfoPng, LodePNG_InfoRaw and Settings.
-
-6.1. PNG color types
---------------------
-
-A PNG image can have many color types, ranging from 1-bit color to 64-bit color,
-as well as palettized color modes. After the zlib decompression and unfiltering
-in the PNG image is done, the raw pixel data will have that color type and thus
-a certain amount of bits per pixel. If you want the output raw image after
-decoding to have another color type, a conversion is done by LodePNG.
-
-The PNG specification mentions the following color types:
-
-0: greyscale, bit depths 1, 2, 4, 8, 16
-2: RGB, bit depths 8 and 16
-3: palette, bit depths 1, 2, 4 and 8
-4: greyscale with alpha, bit depths 8 and 16
-6: RGBA, bit depths 8 and 16
-
-Bit depth is the amount of bits per pixel per color channel. So the total amount
-of bits per pixel = amount of channels * bitDepth.
-
-6.2. Default Behaviour of LodePNG
----------------------------------
-
-By default, the Decoder will convert the data from the PNG to 32-bit RGBA color,
-no matter what color type the PNG has, so that the result can be used directly
-as a texture in OpenGL etc... without worries about what color type the original
-image has.
-
-The Encoder assumes by default that the raw input you give it is a 32-bit RGBA
-buffer and will store the PNG as either 32 bit or 24 bit depending on whether
-or not any translucent pixels were detected in it.
-
-To get the default behaviour, don't change the values of LodePNG_InfoRaw and
-LodePNG_InfoPng of the encoder, and don't change the values of LodePNG_InfoRaw
-of the decoder.
-
-6.3. Color Conversions
-----------------------
-
-As explained in the sections about the Encoder and Decoder, you can specify
-color types and bit depths in LodePNG_InfoPng and LodePNG_InfoRaw, to change the default behaviour
-explained above. (for the Decoder you can only specify the LodePNG_InfoRaw, because the
-LodePNG_InfoPng contains what the PNG file has).
-
-To avoid some confusion:
--the Decoder converts from PNG to raw image
--the Encoder converts from raw image to PNG
--the color type and bit depth in LodePNG_InfoRaw, are those of the raw image
--the color type and bit depth in LodePNG_InfoPng, are those of the PNG
--if the color type of the LodePNG_InfoRaw and PNG image aren't the same, a conversion
-between the color types is done if the color types are supported. If it is not
-supported, an error is returned. If the types are the same, no conversion is done
-and this is supported for any color type.
-
-Supported color conversions:
--It's possible to load PNGs from any colortype and to save PNGs of any colorType.
--Both encoder and decoder use the same converter. So both encoder and decoder
-suport the same color types at the input and the output. So the decoder supports
-any type of PNG image and can convert it to certain types of raw image, while the
-encoder supports any type of raw data but only certain color types for the output PNG.
--The converter can convert from _any_ input color type, to 24-bit RGB or 32-bit RGBA (8 bits per channel)
--The converter can convert from _any_ input color type, to 48-bit RGB or 64-bit RGBA (16 bits per channel)
--The converter can convert from greyscale input color type, to 8-bit greyscale or greyscale with alpha
--The converter can convert from greyscale input color type, to 16-bit greyscale or greyscale with alpha
--If both color types are the same, conversion from anything to anything is possible
--Color types that are invalid according to the PNG specification are not allowed
--When converting from a type with alpha channel to one without, the alpha channel information is discarded
--When converting from a type without alpha channel to one with, the result will be opaque except
- pixels that have the same color as the color key of the input if one was given
--When converting from 16-bit bitDepth to 8-bit bitDepth, the 16-bit precision information is lost,
- only the most significant byte is kept
--When converting from 8-bit bitDepth to 16-bit bitDepth, the 8-bit byte is duplicated, so that 0 stays 0, and
- the 8-bit maximum 255 is converted to the 16-bit maximum 65535. Something similar happens at bit level for
- converting very low bit depths to 8 or 16 bit.
--Converting from color to greyscale or to palette is not supported on purpose: there are multiple possible
- algorithms to do this color reduction, LodePNG does not want to pick one and leaves this choice to the
- user instead, because it's beyond the scope of PNG encoding.
--Converting from a palette to a palette, only keeps the indices, it ignores the colors defined in the
- palette without giving an error
-
-No conversion needed...:
--If the color type of the PNG image and raw image are the same, then no
-conversion is done, and all color types are supported.
--In the encoder, you can make it save a PNG with any color by giving the
-LodePNG_InfoRaw and LodePNG_InfoPng the same color type.
--In the decoder, you can make it store the pixel data in the same color type
-as the PNG has, by setting the color_convert setting to false. Settings in
-infoRaw are then ignored.
-
-The function LodePNG_convert does this, which is available in the interface but
-normally isn't needed since the encoder and decoder already call it.
-
-6.4. More Notes
----------------
-
-In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines
-have a bit amount that isn't a multiple of 8, then padding bits are used so that each
-scanline starts at a fresh byte. But that is NOT true for the LodePNG input and output!
-The raw input image you give to the encoder, and the raw output image you get from the decoder
-will NOT have these padding bits, e.g. in the case of a 1-bit image with a width
-of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte,
-not the first bit of a new byte.
-
-7. error values
----------------
-
-All functions in LodePNG that return an error code, return 0 if everything went
-OK, or one of the code defined by LodePNG if there was an error.
-
-The meaning of the LodePNG error values can be retrieved with the function
-LodePNG_error_text: given the numerical error code, it returns a description
-of the error in English as a string.
-
-Check the implementation of LodePNG_error_text to see the meaning of each error code.
-
-
-8. chunks and PNG editing
--------------------------
-
-If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG
-editor that should follow the rules about handling of unknown chunks, or if you
-program is able to read other types of chunks than the ones handled by LodePNG,
-then that's possible with the chunk functions of LodePNG.
-
-A PNG chunk has the following layout:
-
-4 bytes length
-4 bytes type name
-length bytes data
-4 bytes CRC
-
-
-8.1. iterating through chunks
------------------------------
-
-If you have a buffer containing the PNG image data, then the first chunk (the
-IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the
-signature of the PNG and are not part of a chunk. But if you start at byte 8
-then you have a chunk, and can check the following things of it.
-
-NOTE: none of these functions check for memory buffer boundaries. To avoid
-exploits, always make sure the buffer contains all the data of the chunks.
-When using LodePNG_chunk_next, make sure the returned value is within the
-allocated memory.
-
-unsigned LodePNG_chunk_length(const unsigned char* chunk):
-
-Get the length of the chunk's data. The total chunk length is this length + 12.
-
-void LodePNG_chunk_type(char type[5], const unsigned char* chunk):
-unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type):
-
-Get the type of the chunk or compare if it's a certain type
-
-unsigned char LodePNG_chunk_critical(const unsigned char* chunk):
-unsigned char LodePNG_chunk_private(const unsigned char* chunk):
-unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk):
-
-Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are).
-Check if the chunk is private (public chunks are part of the standard, private ones not).
-Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical
-chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your
-program doesn't handle that type of unknown chunk.
-
-unsigned char* LodePNG_chunk_data(unsigned char* chunk):
-const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk):
-
-Get a pointer to the start of the data of the chunk.
-
-unsigned LodePNG_chunk_check_crc(const unsigned char* chunk):
-void LodePNG_chunk_generate_crc(unsigned char* chunk):
-
-Check if the crc is correct or generate a correct one.
-
-unsigned char* LodePNG_chunk_next(unsigned char* chunk):
-const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk):
-
-Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these
-functions do no boundary checking of the allocated data whatsoever, so make sure there is enough
-data available in the buffer to be able to go to the next chunk.
-
-unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk):
-unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length,
- const char* type, const unsigned char* data):
-
-These functions are used to create new chunks that are appended to the data in *out that has
-length *outlength. The append function appends an existing chunk to the new data. The create
-function creates a new chunk with the given parameters and appends it. Type is the 4-letter
-name of the chunk.
-
-
-8.2. chunks in infoPng
-----------------------
-
-The LodePNG_InfoPng struct contains a struct LodePNG_UnknownChunks in it. This
-struct has 3 buffers (each with size) to contain 3 types of unknown chunks:
-the ones that come before the PLTE chunk, the ones that come between the PLTE
-and the IDAT chunks, and the ones that come after the IDAT chunks.
-It's necessary to make the distionction between these 3 cases because the PNG
-standard forces to keep the ordering of unknown chunks compared to the critical
-chunks, but does not force any other ordering rules.
-
-infoPng.unknown_chunks.data[0] is the chunks before PLTE
-infoPng.unknown_chunks.data[1] is the chunks after PLTE, before IDAT
-infoPng.unknown_chunks.data[2] is the chunks after IDAT
-
-The chunks in these 3 buffers can be iterated through and read by using the same
-way described in the previous subchapter.
-
-When using the decoder to decode a PNG, you can make it store all unknown chunks
-if you set the option settings.rememberUnknownChunks to 1. By default, this option
-is off and is 0.
-
-The encoder will always encode unknown chunks that are stored in the infoPng. If
-you need it to add a particular chunk that isn't known by LodePNG, you can use
-LodePNG_append_chunk or LodePNG_create_chunk to the chunk data in
-infoPng.unknown_chunks.data[x].
-
-Chunks that are known by LodePNG should not be added in that way. E.g. to make
-LodePNG add a bKGD chunk, set background_defined to true and add the correct
-parameters there and LodePNG will generate the chunk.
-
-
-9. compiler support
--------------------
-
-No libraries other than the current standard C library are needed to compile
-LodePNG. For the C++ version, only the standard C++ library is needed on top.
-Add the files lodepng.c(pp) and lodepng.h to your project, include
-lodepng.h where needed, and your program can read/write PNG files.
-
-Use optimization! For both the encoder and decoder, compiling with the best
-optimizations makes a large difference.
-
-Make sure that LodePNG is compiled with the same compiler of the same version
-and with the same settings as the rest of the program, or the interfaces with
-std::vectors and std::strings in C++ can be incompatible resulting in bad things.
-
-CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets.
-
-*) gcc and g++
-
-LodePNG is developed in gcc so this compiler is natively supported. It gives no
-warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++
-version 4.5.1 on Linux.
-
-*) Mingw and Bloodshed DevC++
-
-The Mingw compiler (a port of gcc) used by Bloodshed DevC++ for Windows is fully
-supported by LodePNG.
-
-*) Visual Studio 2005 and Visual C++ 2005 Express Edition
-
-Versions 20070604 up to 20080107 have been tested on VS2005 and work. Visual
-studio may give warnings about 'fopen' being deprecated. A multiplatform library
-can't support the proposed Visual Studio alternative however.
-
-If you're using LodePNG in VS2005 and don't want to see the deprecated warnings,
-put this on top of lodepng.h before the inclusions: #define _CRT_SECURE_NO_DEPRECATE
-
-*) Visual Studio 6.0
-
-The C++ version of LodePNG was not supported by Visual Studio 6.0 because Visual
-Studio 6.0 doesn't follow the C++ standard and implements it incorrectly.
-The current C version of LodePNG has not been tested in VS6 but may work now.
-
-*) Comeau C/C++
-
-Vesion 20070107 compiles without problems on the Comeau C/C++ Online Test Drive
-at http://www.comeaucomputing.com/tryitout in both C90 and C++ mode.
-
-*) Compilers on Macintosh
-
-LodePNG has been reported to work both with the gcc and LLVM for Macintosh, both
-for C and C++.
-
-*) Other Compilers
-
-If you encounter problems on other compilers, I'm happy to help out make LodePNG
-support the compiler if it supports the ISO C90 and C++ standard well enough and
-the required modification doesn't require using non standard or less good C/C++
-code or headers.
-
-
-10. examples
-------------
-
-This decoder and encoder example show the most basic usage of LodePNG (using the
-classes, not the simple functions, which would be trivial)
-
-More complex examples can be found in:
--lodepng_examples.c: 9 different examples in C, such as showing the image with SDL, ...
--lodepng_examples.cpp: the same examples in C++ using the C++ wrapper of LodePNG
-
-These files can be found on the LodePNG website or searched for on the internet.
-
-10.1. decoder C++ example
--------------------------
-
-////////////////////////////////////////////////////////////////////////////////
-#include "lodepng.h"
-#include <iostream>
-
-int main(int argc, char *argv[])
-{
- const char* filename = argc > 1 ? argv[1] : "test.png";
-
- //load and decode
- std::vector<unsigned char> buffer, image; //buffer will contain the PNG file, image will contain the raw pixels
- LodePNG::loadFile(buffer, filename); //load the image file with given filename
- LodePNG::Decoder decoder;
- decoder.decode(image, buffer.size() ? &buffer[0] : 0, (unsigned)buffer.size()); //decode the png
-
- //if there's an error, display it
- if(decoder.hasError())
- std::cout << "error " << decoder.getError() << ": "<< LodePNG_error_text(decoder.getError()) << std::endl;
-
- int width = decoder.getWidth(); //get the width in pixels
- int height = decoder.getHeight(); //get the height in pixels
- //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
-}
-
-//alternative version using the "simple" function
-int main(int argc, char *argv[])
-{
- const char* filename = argc > 1 ? argv[1] : "test.png";
-
- //load and decode
- std::vector<unsigned char> image;
- unsigned width, height;
- unsigned error = LodePNG::decode(image, width, height, filename);
-
- //if there's an error, display it
- if(error != 0) std::cout << "error " << error << ": " << LodePNG_error_text(error) << std::endl;
-
- //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
-}
-////////////////////////////////////////////////////////////////////////////////
-
-
-10.2. encoder C++ example
--------------------------
-
-////////////////////////////////////////////////////////////////////////////////
-#include "lodepng.h"
-#include <iostream>
-
-//saves image to filename given as argument. Warning, this overwrites the file without warning!
-int main(int argc, char *argv[])
-{
- //check if user gave a filename
- if(argc <= 1)
- {
- std::cout << "please provide a filename to save to\n";
- return 0;
- }
-
- //generate some image
- std::vector<unsigned char> image;
- image.resize(512 * 512 * 4);
- for(unsigned y = 0; y < 512; y++)
- for(unsigned x = 0; x < 512; x++)
- {
- image[4 * 512 * y + 4 * x + 0] = 255 * !(x & y);
- image[4 * 512 * y + 4 * x + 1] = x ^ y;
- image[4 * 512 * y + 4 * x + 2] = x | y;
- image[4 * 512 * y + 4 * x + 3] = 255;
- }
-
- //encode and save, using the Encoder class
- std::vector<unsigned char> buffer;
- LodePNG::Encoder encoder;
- encoder.encode(buffer, image, 512, 512);
- LodePNG::saveFile(buffer, argv[1]);
-
- //the same as the 4 lines of code above, but in 1 call without the class:
- //LodePNG::encode(argv[1], image, 512, 512);
-}
-////////////////////////////////////////////////////////////////////////////////
-
-
-10.3. Decoder C example
------------------------
-
-This example loads the PNG from a file into a pixel buffer in 1 function call
-
-#include "lodepng.h"
-
-int main(int argc, char *argv[])
-{
- unsigned error;
- unsigned char* image;
- size_t width, height;
-
- if(argc <= 1) return 0;
-
- error = LodePNG_decode32_file(&image, &width, &height, filename);
-
- if(error != 0) printf("error %u: %s\n", error, LodePNG_error_text(error));
-
- //use image here
-
- free(image);
-}
-
-
-11. changes
------------
-
-The version number of LodePNG is the date of the change given in the format
-yyyymmdd.
-
-Some changes aren't backwards compatible. Those are indicated with a (!)
-symbol.
-
-*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching.
-*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking.
- A bug with the PNG filtertype heuristic was fixed, so that it chooses much
- better ones (it's quite significant). A setting to do an experimental, slow,
- brute force search for PNG filter types is added.
-*) 17 aug 2011 (!): changed some C zlib related function names.
-*) 16 aug 2011: made the code less wide (max 120 characters per line).
-*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors.
-*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled.
-*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman
- to optimize long sequences of zeros.
-*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and
- LodePNG_InfoColor_canHaveAlpha functions for convenience.
-*) 7 nov 2010: added LodePNG_error_text function to get error code description.
-*) 30 okt 2010: made decoding slightly faster
-*) 26 okt 2010: (!) changed some C function and struct names (more consistent).
- Reorganized the documentation and the declaration order in the header.
-*) 08 aug 2010: only changed some comments and external samples.
-*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version.
-*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers.
-*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could
- read by ignoring the problem but windows apps couldn't.
-*) 06 jun 2008: added more error checks for out of memory cases.
-*) 26 apr 2008: added a few more checks here and there to ensure more safety.
-*) 06 mar 2008: crash with encoding of strings fixed
-*) 02 feb 2008: support for international text chunks added (iTXt)
-*) 23 jan 2008: small cleanups, and #defines to divide code in sections
-*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor.
-*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder.
-*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added
- Also vareous fixes, such as in the deflate and the padding bits code.
-*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved
- filtering code of encoder.
-*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A
- C++ wrapper around this provides an interface almost identical to before.
- Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code
- are together in these files but it works both for C and C++ compilers.
-*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks
-*) 30 aug 2007: bug fixed which makes this Borland C++ compatible
-*) 09 aug 2007: some VS2005 warnings removed again
-*) 21 jul 2007: deflate code placed in new namespace separate from zlib code
-*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images
-*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing
- invalid std::vector element [0] fixed, and level 3 and 4 warnings removed
-*) 02 jun 2007: made the encoder add a tag with version by default
-*) 27 may 2007: zlib and png code separated (but still in the same file),
- simple encoder/decoder functions added for more simple usage cases
-*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69),
- moved some examples from here to lodepng_examples.cpp
-*) 12 may 2007: palette decoding bug fixed
-*) 24 apr 2007: changed the license from BSD to the zlib license
-*) 11 mar 2007: very simple addition: ability to encode bKGD chunks.
-*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding
- palettized PNG images. Plus little interface change with palette and texts.
-*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes.
- Fixed a bug where the end code of a block had length 0 in the Huffman tree.
-*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented
- and supported by the encoder, resulting in smaller PNGs at the output.
-*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone.
-*) 24 jan 2007: gave encoder an error interface. Added color conversion from any
- greyscale type to 8-bit greyscale with or without alpha.
-*) 21 jan 2007: (!) Totally changed the interface. It allows more color types
- to convert to and is more uniform. See the manual for how it works now.
-*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days:
- encode/decode custom tEXt chunks, separate classes for zlib & deflate, and
- at last made the decoder give errors for incorrect Adler32 or Crc.
-*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel.
-*) 29 dec 2006: Added support for encoding images without alpha channel, and
- cleaned out code as well as making certain parts faster.
-*) 28 dec 2006: Added "Settings" to the encoder.
-*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now.
- Removed some code duplication in the decoder. Fixed little bug in an example.
-*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter.
- Fixed a bug of the decoder with 16-bit per color.
-*) 15 okt 2006: Changed documentation structure
-*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the
- given image buffer, however for now it's not compressed.
-*) 08 sep 2006: (!) Changed to interface with a Decoder class
-*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different
- way. Renamed decodePNG to decodePNGGeneric.
-*) 29 jul 2006: (!) Changed the interface: image info is now returned as a
- struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy.
-*) 28 jul 2006: Cleaned the code and added new error checks.
- Corrected terminology "deflate" into "inflate".
-*) 23 jun 2006: Added SDL example in the documentation in the header, this
- example allows easy debugging by displaying the PNG and its transparency.
-*) 22 jun 2006: (!) Changed way to obtain error value. Added
- loadFile function for convenience. Made decodePNG32 faster.
-*) 21 jun 2006: (!) Changed type of info vector to unsigned.
- Changed position of palette in info vector. Fixed an important bug that
- happened on PNGs with an uncompressed block.
-*) 16 jun 2006: Internally changed unsigned into unsigned where
- needed, and performed some optimizations.
-*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them
- in LodePNG namespace. Changed the order of the parameters. Rewrote the
- documentation in the header. Renamed files to lodepng.cpp and lodepng.h
-*) 22 apr 2006: Optimized and improved some code
-*) 07 sep 2005: (!) Changed to std::vector interface
-*) 12 aug 2005: Initial release (C++, decoder only)
-
-
-12. contact information
------------------------
-
-Feel free to contact me with suggestions, problems, comments, ... concerning
-LodePNG. If you encounter a PNG image that doesn't work properly with this
-decoder, feel free to send it and I'll use it to find and fix the problem.
-
-My email address is (puzzle the account and domain together with an @ symbol):
-Domain: gmail dot com.
-Account: lode dot vandevenne.
-
-
-Copyright (c) 2005-2011 Lode Vandevenne
-*/
-
-#endif
-
contact: Jan Huwald // Impressum