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Bug 1063129 - Switch mImageSurface to RGBX on SetHasNoAlpha, r=seth

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This commit is contained in:
Michael Wu 2014-09-04 16:53:43 -04:00
parent 737d1f11ae
commit 60ddfcde08
1 changed files with 7 additions and 5 deletions
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12
image/src/imgFrame.cpp
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@ -742,15 +742,17 @@ bool imgFrame::ImageComplete() const
}
// A hint from the image decoders that this image has no alpha, even
// though we created is ARGB32. This changes our format to RGB24,
// which in turn will cause us to Optimize() to RGB24. Has no effect
// after Optimize() is called, though in all cases it will be just a
// performance win -- the pixels are still correct and have the A byte
// set to 0xff.
// though we're decoding it as B8G8R8A8.
// Since this is only called during decoding, there is a mImageSurface
// that should be updated to use B8G8R8X8. This doesn't change the
// underlying data at all, but allows DrawTargets to avoid blending
// when drawing known opaque images.
void imgFrame::SetHasNoAlpha()
{
if (mFormat == SurfaceFormat::B8G8R8A8) {
mFormat = SurfaceFormat::B8G8R8X8;
MOZ_ASSERT(mImageSurface);
mImageSurface = CreateLockedSurface(mVBuf, mSize, mFormat);
}
}