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Bug 1141488 - On non-APZ platforms, combine any async transform with the OMTA transform rather than clobbering it the OMTA transform. r=kats

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Botond Ballo 2015-03-11 13:18:52 -04:00
parent 991a4a7230
commit d4ca243169
1 changed files with 5 additions and 3 deletions
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8
gfx/layers/composite/AsyncCompositionManager.cpp
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@ -980,9 +980,11 @@ AsyncCompositionManager::TransformScrollableLayer(Layer* aLayer)
ParentLayerPoint translation = userScroll - geckoScroll;
Matrix4x4 treeTransform = ViewTransform(asyncZoom, -translation);
SetShadowTransform(aLayer, oldTransform * treeTransform);
NS_ASSERTION(!aLayer->AsLayerComposite()->GetShadowTransformSetByAnimation(),
"overwriting animated transform!");
// Apply the tree transform on top of GetLocalTransform() here (rather than
// GetTransform()) in case the OMTA code in SampleAnimations already set a
// shadow transform; in that case we want to apply ours on top of that one
// rather than clobber it.
SetShadowTransform(aLayer, aLayer->GetLocalTransform() * treeTransform);
// Make sure that overscroll and under-zoom are represented in the old
// transform so that fixed position content moves and scales accordingly.