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Bug 1435648 - Part 2: Preallocate the mAssignedDisplayItems array to the size it was last time. r=mstange

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This commit is contained in:
Matt Woodrow 2018-02-13 13:40:21 +13:00
parent c415ea1075
commit df0359273e
1 changed files with 11 additions and 1 deletions
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12
layout/painting/FrameLayerBuilder.cpp
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@ -1478,7 +1478,8 @@ public:
mXScale(1.f), mYScale(1.f),
mAppUnitsPerDevPixel(0),
mTranslation(0, 0),
mAnimatedGeometryRootPosition(0, 0) {}
mAnimatedGeometryRootPosition(0, 0),
mLastItemCount(0) {}
/**
* Record the number of clips in the PaintedLayer's mask layer.
@ -1541,6 +1542,9 @@ public:
// DrawPaintedLayer, for example when progressive paint is enabled.
nsIntRegion mVisibilityComputedRegion;
// The number of items assigned to this layer on the previous paint.
size_t mLastItemCount;
/**
* This is set when the painted layer has no component alpha.
*/
@ -3140,6 +3144,9 @@ void ContainerState::FinishPaintedLayerData(PaintedLayerData& aData, FindOpaqueB
oldData, item);
}
PaintedDisplayItemLayerUserData* userData = GetPaintedDisplayItemLayerUserData(data->mLayer);
userData->mLastItemCount = data->mAssignedDisplayItems.Length();
NewLayerEntry* newLayerEntry = &mNewChildLayers[data->mNewChildLayersIndex];
RefPtr<Layer> layer;
@ -4567,6 +4574,9 @@ ContainerState::ProcessDisplayItems(nsDisplayList* aList)
if (layer) {
paintedLayerData->mLayer = layer;
PaintedDisplayItemLayerUserData* userData = GetPaintedDisplayItemLayerUserData(layer);
paintedLayerData->mAssignedDisplayItems.SetCapacity(userData->mLastItemCount);
NS_ASSERTION(FindIndexOfLayerIn(mNewChildLayers, layer) < 0,
"Layer already in list???");
mNewChildLayers[paintedLayerData->mNewChildLayersIndex].mLayer = layer.forget();