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Create an optimized palette if GifDecoder generates a RGB image with more than 256 colors

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This commit is contained in:
David Capello 2015-07-31 11:06:26 -03:00
parent cd1ca4c68f
commit a6c24ac768
1 changed files with 22 additions and 1 deletions
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23
src/app/file/gif_format.cpp
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@ -214,8 +214,15 @@ public:
m_sprite->palette(0)->resize(m_bgIndex+1);
// Use the original global color map
if (m_gifFile->SColorMap && !m_hasLocalColormaps)
if (m_sprite->pixelFormat() == IMAGE_INDEXED &&
m_gifFile->SColorMap && !m_hasLocalColormaps) {
remapToGlobalColormap();
}
// Avoid huge color palettes
else if (m_sprite->pixelFormat() == IMAGE_RGB &&
m_sprite->palette(0)->size() > 256) {
reduceToAnOptimizedPalette();
}
if (m_layer && m_opaque)
m_layer->configureAsBackground();
@ -668,6 +675,20 @@ private:
m_sprite->setPalette(&newPalette, false);
}
void reduceToAnOptimizedPalette() {
render::PaletteOptimizer optimizer;
const Palette* palette = m_sprite->palette(0);
// Feed the palette optimizer with pixels inside frameBounds
for (int i=0; i<palette->size(); ++i) {
optimizer.feedWithRgbaColor(palette->getEntry(i));
}
Palette newPalette(0, 256);
optimizer.calculate(&newPalette, m_bgIndex, nullptr);
m_sprite->setPalette(&newPalette, false);
}
FileOp* m_fop;
GifFileType* m_gifFile;
int m_fd;