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#include <ApplicationServices/ApplicationServices.h>
#include <iostream>
#include "imageutils.h"
#include <assert.h>
CGDataConsumerCallbacks dc_callbacks;
size_t write_bytes_to_ostream (void *info,const void *buffer,size_t count)
{
assert( info && buffer );
std::ostream *output = (std::ostream *)info;
size_t startpos = output->tellp();
size_t endpos = startpos;
try {
output->write( (const char *)buffer, count );
endpos = output->tellp();
} catch (const std::ios_base::failure& e) {
std::cerr << "Error writing to ostream:" << e.what() << "\n";
}
return (endpos-startpos);
}
CGDataConsumerRef CGDataConsumerCreateWithOstream(std::ostream &output)
{
dc_callbacks.putBytes = write_bytes_to_ostream;
dc_callbacks.releaseConsumer = NULL; // ostream closed by caller of write_png
CGDataConsumerRef dc = CGDataConsumerCreate ( (void *)(&output), &dc_callbacks );
return dc;
}
bool write_png(std::ostream &output, 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;
}
CGDataConsumerRef dataconsumer = CGDataConsumerCreateWithOstream(output);
/*
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;
}
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