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Bug 713523. Part 2: Add SimplifyOutward for mVisibleAboveRegion and mDrawAboveRegion to avoid performance sinkholes when many layers are above a single ThebesLayer. r=tn

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This commit is contained in:
Robert O'Callahan 2012-01-12 00:26:33 +13:00
parent 853836ab04
commit 08a3cb7145
1 changed files with 6 additions and 0 deletions
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6
layout/base/FrameLayerBuilder.cpp
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@ -232,12 +232,14 @@ protected:
* next ThebesLayerData currently in the stack, if any. Note that not
* all ThebesLayers for the container are in the ThebesLayerData stack.
* Same coordinate system as mVisibleRegion.
* This is a conservative approximation: it contains the true region.
*/
nsIntRegion mVisibleAboveRegion;
/**
* The region containing the bounds of all display items in the layer,
* regardless of visbility.
* Same coordinate system as mVisibleRegion.
* This is a conservative approximation: it contains the true region.
*/
nsIntRegion mDrawRegion;
/**
@ -1105,10 +1107,12 @@ ContainerState::PopThebesLayerData()
data->mVisibleAboveRegion);
nextData->mVisibleAboveRegion.Or(nextData->mVisibleAboveRegion,
data->mVisibleRegion);
nextData->mVisibleAboveRegion.SimplifyOutward(4);
nextData->mDrawAboveRegion.Or(nextData->mDrawAboveRegion,
data->mDrawAboveRegion);
nextData->mDrawAboveRegion.Or(nextData->mDrawAboveRegion,
data->mDrawRegion);
nextData->mDrawAboveRegion.SimplifyOutward(4);
}
mThebesLayerDataStack.RemoveElementAt(lastIndex);
@ -1440,11 +1444,13 @@ ContainerState::ProcessDisplayItems(const nsDisplayList& aList,
ThebesLayerData* data = GetTopThebesLayerData();
if (data) {
data->mVisibleAboveRegion.Or(data->mVisibleAboveRegion, itemVisibleRect);
data->mVisibleAboveRegion.SimplifyOutward(4);
// Add the entire bounds rect to the mDrawAboveRegion.
// The visible region may be excluding opaque content above the
// item, and we need to ensure that that content is not placed
// in a ThebesLayer below the item!
data->mDrawAboveRegion.Or(data->mDrawAboveRegion, itemDrawRect);
data->mDrawAboveRegion.SimplifyOutward(4);
}
RestrictVisibleRegionForLayer(ownLayer, itemVisibleRect);
ContainerLayer* oldContainer = ownLayer->GetParent();