Merge remote-tracking branch 'upstream/master'

1 files changed, 6 insertions, 1 deletions

diff --git a/src/imageutils-lodepng.cc b/src/imageutils-lodepng.cc
index cd104d6..a71a017 100644
--- a/src/imageutils-lodepng.cc
+++ b/src/imageutils-lodepng.cc
@@ -9,7 +9,12 @@
 bool write_png(std::ostream &output, unsigned char *pixels, int width, int height)
 {
 	std::vector<unsigned char> dataout;
-	unsigned err = lodepng::encode(dataout, pixels, width, height, LCT_RGBA, 8);
+	lodepng::State state;
+	state.encoder.auto_convert = LAC_NO;
+	// some png renderers have different interpretations of alpha, so don't use it
+	state.info_png.color.colortype = LCT_RGB;
+	state.info_png.color.bitdepth = 8;
+	unsigned err = lodepng::encode(dataout, pixels, width, height, state);
 	if ( err ) return false;
 	output.write( reinterpret_cast<const char *>(&dataout[0]), dataout.size());
 	if ( output.bad() ) std::cerr << "Error writing to ostream\n";