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Bug 1207420 - Improve GetBounds() to avoid recomputing every time. r=roc

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This commit is contained in:
Thinker K.F. Li 2015-09-28 00:15:00 +02:00
parent 1df74e473e
commit 670e4d1065
1 changed files with 13 additions and 5 deletions
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18
layout/base/nsDisplayList.h
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@ -3589,20 +3589,28 @@ class nsDisplayTransform: public nsDisplayItem
public: public:
StoreList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, StoreList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayList* aList) : nsDisplayList* aList) :
nsDisplayWrapList(aBuilder, aFrame, aList) {} nsDisplayWrapList(aBuilder, aFrame, aList),
mHasBounds(false) {}
StoreList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, StoreList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayItem* aItem) : nsDisplayItem* aItem) :
nsDisplayWrapList(aBuilder, aFrame, aItem) {} nsDisplayWrapList(aBuilder, aFrame, aItem),
mHasBounds(false) {}
virtual ~StoreList() {} virtual ~StoreList() {}
virtual void UpdateBounds(nsDisplayListBuilder* aBuilder) override {} virtual void UpdateBounds(nsDisplayListBuilder* aBuilder) override {}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) override { bool* aSnap) override {
// The bounds should not be computed until now, because we don't if (!mHasBounds) {
// get accmulated transform before. // The bounds should not be computed until now, because we don't
nsDisplayWrapList::UpdateBounds(aBuilder); // get accmulated transform before.
nsDisplayWrapList::UpdateBounds(aBuilder);
mHasBounds = true;
}
return nsDisplayWrapList::GetBounds(aBuilder, aSnap); return nsDisplayWrapList::GetBounds(aBuilder, aSnap);
} }
private:
bool mHasBounds;
}; };
public: public: