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Bug 907048 - Skip colorlayer if other opacity layer just covers the colorlayer region, r=roc

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This commit is contained in:
Robert O'Callahan 2013-09-16 10:20:30 +08:00
parent 14aa813413
commit 4168a4671f
1 changed files with 49 additions and 0 deletions
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49
gfx/layers/composite/ContainerLayerComposite.cpp
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@ -47,6 +47,38 @@ HasOpaqueAncestorLayer(Layer* aLayer)
return false;
}
/**
* Returns a rectangle of content painted opaquely by aLayer. Very consertative;
* bails by returning an empty rect in any tricky situations.
*/
static nsIntRect
GetOpaqueRect(Layer* aLayer)
{
nsIntRect result;
// Just bail if there's anything difficult to handle.
if (!aLayer->GetEffectiveTransform().IsIdentity() ||
aLayer->GetEffectiveOpacity() != 1.0f ||
aLayer->GetMaskLayer()) {
return result;
}
if (aLayer->GetContentFlags() & Layer::CONTENT_OPAQUE) {
result = aLayer->GetEffectiveVisibleRegion().GetLargestRectangle();
} else {
// Drill down into RefLayers because that's what we particularly care about;
// layer construction for aLayer will not have known about the opaqueness
// of any RefLayer subtrees.
RefLayer* refLayer = aLayer->AsRefLayer();
if (refLayer && refLayer->GetFirstChild()) {
result = GetOpaqueRect(refLayer->GetFirstChild());
}
}
const nsIntRect* clipRect = aLayer->GetEffectiveClipRect();
if (clipRect) {
result.IntersectRect(result, *clipRect);
}
return result;
}
template<class ContainerT> void
ContainerRender(ContainerT* aContainer,
const nsIntPoint& aOffset,
@ -143,6 +175,23 @@ ContainerRender(ContainerT* aContainer,
continue;
}
if (i + 1 < children.Length() &&
layerToRender->GetLayer()->GetEffectiveTransform().IsIdentity()) {
LayerComposite* nextLayer = static_cast<LayerComposite*>(children.ElementAt(i + 1)->ImplData());
nsIntRect nextLayerOpaqueRect;
if (nextLayer && nextLayer->GetLayer()) {
nextLayerOpaqueRect = GetOpaqueRect(nextLayer->GetLayer());
}
if (!nextLayerOpaqueRect.IsEmpty()) {
nsIntRegion visibleRegion;
visibleRegion.Sub(layerToRender->GetShadowVisibleRegion(), nextLayerOpaqueRect);
layerToRender->SetShadowVisibleRegion(visibleRegion);
if (visibleRegion.IsEmpty()) {
continue;
}
}
}
nsIntRect clipRect = layerToRender->GetLayer()->
CalculateScissorRect(aClipRect, &aManager->GetWorldTransform());
if (clipRect.IsEmpty()) {