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Bug 948848 - Fold transform scale factors down to leaf layers even for temporary layer managers since it can make a difference for clips that are snapped to pixel boundaries. r=roc

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This commit is contained in:
Matt Woodrow 2013-12-16 18:37:47 +13:00
parent 6dca4a53b6
commit 4b38430d54
1 changed files with 2 additions and 4 deletions
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6
layout/base/FrameLayerBuilder.cpp
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@ -2844,11 +2844,8 @@ ChooseScaleAndSetTransform(FrameLayerBuilder* aLayerBuilder,
bool canDraw2D = transform.CanDraw2D(&transform2d);
gfxSize scale;
bool isRetained = aLayer->Manager()->IsWidgetLayerManager();
// Only fiddle with scale factors for the retaining layer manager, since
// it only matters for retained layers
// XXX Should we do something for 3D transforms?
if (canDraw2D && isRetained) {
if (canDraw2D) {
// If the container's transform is animated off main thread, then use the
// maximum scale.
if (aContainerFrame->GetContent() &&
@ -2910,6 +2907,7 @@ ChooseScaleAndSetTransform(FrameLayerBuilder* aLayerBuilder,
aOutgoingScale.mInActiveTransformedSubtree = true;
}
}
bool isRetained = aLayer->Manager()->IsWidgetLayerManager();
if (isRetained && (!canDraw2D || transform2d.HasNonIntegerTranslation())) {
aOutgoingScale.mDisableSubpixelAntialiasingInDescendants = true;
}