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Bug 923434 - Don't use operator source for D2D in ThebesLayerBuffer since it's slower. r=Bas

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This commit is contained in:
Matt Woodrow 2013-11-05 17:50:56 +13:00
parent 92d47bc46f
commit 2b4a1c6957
1 changed files with 13 additions and 0 deletions
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13
gfx/layers/ThebesLayerBuffer.cpp
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@ -178,6 +178,19 @@ RotatedBuffer::DrawBufferQuadrant(gfx::DrawTarget* aTarget,
gfx::Point quadrantTranslation(quadrantRect.x, quadrantRect.y);
MOZ_ASSERT(aOperator == OP_OVER || aOperator == OP_SOURCE);
// direct2d is much slower when using OP_SOURCE so use OP_OVER and
// (maybe) a clear instead. Normally we need to draw in a single operation
// (to avoid flickering) but direct2d is ok since it defers rendering.
// We should try abstract this logic in a helper when we have other use
// cases.
if (aTarget->GetType() == BACKEND_DIRECT2D && aOperator == OP_SOURCE) {
aOperator = OP_OVER;
if (mDTBuffer->GetFormat() == FORMAT_B8G8R8A8) {
aTarget->ClearRect(ToRect(fillRect));
}
}
RefPtr<SourceSurface> snapshot;
if (aSource == BUFFER_BLACK) {
snapshot = mDTBuffer->Snapshot();