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Bug 1147673 - Relax the ancestor transform assertion a little. r=kats

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This commit is contained in:
Markus Stange 2015-12-22 17:06:04 +01:00
parent 0b59e1f795
commit 2e972aeb64
1 changed files with 8 additions and 2 deletions
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10
gfx/layers/apz/src/APZCTreeManager.cpp
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@ -516,8 +516,14 @@ APZCTreeManager::PrepareNodeForLayer(const LayerMetricsWrapper& aLayer,
// Even though different layers associated with a given APZC may be at
// different levels in the layer tree (e.g. one being an uncle of another),
// we require from Layout that the CSS transforms up to their common
// ancestor be the same.
MOZ_ASSERT(aAncestorTransform == apzc->GetAncestorTransform());
// ancestor be roughly the same. There are cases in which the transforms
// are not exactly the same, for example if the parent is container layer
// for an opacity, and this container layer has a resolution-induced scale
// as its base transform and a prescale that is supposed to undo that scale.
// Due to floating point inaccuracies those transforms can end up not quite
// canceling each other. That's why we're using a fuzzy comparison here
// instead of an exact one.
MOZ_ASSERT(aAncestorTransform.FuzzyEqualsMultiplicative(apzc->GetAncestorTransform()));
ParentLayerIntRegion clipRegion = ComputeClipRegion(state->mController, aLayer);
node->SetHitTestData(GetEventRegions(aLayer), aLayer.GetTransform(), Some(clipRegion),