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-rw-r--r--image/decoders/nsGIFDecoder2.cpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/image/decoders/nsGIFDecoder2.cpp b/image/decoders/nsGIFDecoder2.cpp
index efa145144..6f2be1fa1 100644
--- a/image/decoders/nsGIFDecoder2.cpp
+++ b/image/decoders/nsGIFDecoder2.cpp
@@ -212,10 +212,16 @@ nsGIFDecoder2::BeginImageFrame(const IntRect& aFrameRect,
} else {
// This is an animation frame (and not the first). To minimize the memory
// 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());
pipe =
SurfacePipeFactory::CreatePalettedSurfacePipe(this, Size(), aFrameRect,
- format,
+ SurfaceFormat::B8G8R8A8,
aDepth, Some(animParams),
pipeFlags);
}