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Bug 1195400 - Check ancestor geometry roots when determining scrollability of a layer. r=mattwoodrow

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This commit is contained in:
Markus Stange 2015-09-20 18:28:18 +02:00
parent e339bd4ff2
commit 84649fa33f
1 changed files with 24 additions and 12 deletions
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36
layout/base/FrameLayerBuilder.cpp
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@ -2097,18 +2097,30 @@ ContainerState::GetLayerCreationHint(const nsIFrame* aAnimatedGeometryRoot)
if (mParameters.mInLowPrecisionDisplayPort) {
return LayerManager::SCROLLABLE;
}
nsIFrame* animatedGeometryRootParent = aAnimatedGeometryRoot->GetParent();
nsIScrollableFrame* scrollable = do_QueryFrame(animatedGeometryRootParent);
if (scrollable
#ifdef MOZ_B2G
&& scrollable->WantAsyncScroll()
#endif
) {
// WantAsyncScroll() returns false when the frame has overflow:hidden,
// so we won't create tiled layers for overflow:hidden frames even if
// they have a display port. The main purpose of the WantAsyncScroll check
// is to allow the B2G camera app to use hardware composer for compositing.
return LayerManager::SCROLLABLE;
// Check whether there's any active scroll frame on the animated geometry
// root chain.
nsIFrame* fParent;
for (const nsIFrame* f = aAnimatedGeometryRoot;
f != mContainerAnimatedGeometryRoot;
f = nsLayoutUtils::GetAnimatedGeometryRootForFrame(mBuilder,
fParent, mContainerAnimatedGeometryRoot)) {
fParent = nsLayoutUtils::GetCrossDocParentFrame(f);
if (!fParent) {
break;
}
nsIScrollableFrame* scrollable = do_QueryFrame(fParent);
if (scrollable
#ifdef MOZ_B2G
&& scrollable->WantAsyncScroll()
#endif
) {
// WantAsyncScroll() returns false when the frame has overflow:hidden,
// so we won't create tiled layers for overflow:hidden frames even if
// they have a display port. The main purpose of the WantAsyncScroll check
// is to allow the B2G camera app to use hardware composer for compositing.
return LayerManager::SCROLLABLE;
}
}
return LayerManager::NONE;
}