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Fix blank pixel color for truncated GIFs

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wolfbeast 2018-11-21 14:22:29 +01:00 • committed by Roy Tam
commit 82e68ebad1
1 changed files with 7 additions and 1 deletions
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8
image/decoders/nsGIFDecoder2.cpp
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@ -212,10 +212,16 @@ nsGIFDecoder2::BeginImageFrame(const IntRect& aFrameRect,
} else { } else {
// This is an animation frame (and not the first). To minimize the memory // This is an animation frame (and not the first). To minimize the memory
// usage of animations, the image data is stored in paletted form. // usage of animations, the image data is stored in paletted form.
//
// We should never use paletted surfaces with a draw target directly, so
// the only practical difference between B8G8R8A8 and B8G8R8X8 is the
// cleared pixel value if we get truncated. We want 0 in that case to
// ensure it is an acceptable value for the color map as was the case
// historically.
MOZ_ASSERT(Size() == OutputSize()); MOZ_ASSERT(Size() == OutputSize());
pipe = pipe =
SurfacePipeFactory::CreatePalettedSurfacePipe(this, Size(), aFrameRect, SurfacePipeFactory::CreatePalettedSurfacePipe(this, Size(), aFrameRect,
format, SurfaceFormat::B8G8R8A8,
aDepth, Some(animParams), aDepth, Some(animParams),
pipeFlags); pipeFlags);
} }