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Bug 1207420 - Improve GetBounds() to avoid recomputing every time. r=roc
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@ -3589,20 +3589,28 @@ class nsDisplayTransform: public nsDisplayItem
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public:
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StoreList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
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nsDisplayList* aList) :
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nsDisplayWrapList(aBuilder, aFrame, aList) {}
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nsDisplayWrapList(aBuilder, aFrame, aList),
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mHasBounds(false) {}
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StoreList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
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nsDisplayItem* aItem) :
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nsDisplayWrapList(aBuilder, aFrame, aItem) {}
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nsDisplayWrapList(aBuilder, aFrame, aItem),
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mHasBounds(false) {}
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virtual ~StoreList() {}
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virtual void UpdateBounds(nsDisplayListBuilder* aBuilder) override {}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
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bool* aSnap) override {
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// The bounds should not be computed until now, because we don't
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// get accmulated transform before.
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nsDisplayWrapList::UpdateBounds(aBuilder);
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if (!mHasBounds) {
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// The bounds should not be computed until now, because we don't
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// get accmulated transform before.
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nsDisplayWrapList::UpdateBounds(aBuilder);
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mHasBounds = true;
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}
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return nsDisplayWrapList::GetBounds(aBuilder, aSnap);
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}
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private:
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bool mHasBounds;
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};
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public:
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