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-rw-r--r--layout/base/FrameLayerBuilder.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/layout/base/FrameLayerBuilder.cpp b/layout/base/FrameLayerBuilder.cpp
index 183285439..9aaa28fb5 100644
--- a/layout/base/FrameLayerBuilder.cpp
+++ b/layout/base/FrameLayerBuilder.cpp
@@ -3648,6 +3648,10 @@ PaintedLayerData::AccumulateEventRegions(ContainerState* aState, nsDisplayLayerE
if (alreadyHadRegions) {
mDispatchToContentHitRegion.OrWith(CombinedTouchActionRegion());
}
+
+ // Avoid quadratic performance as a result of the region growing to include
+ // and arbitrarily large number of rects, which can happen on some pages.
+ mMaybeHitRegion.SimplifyOutward(8);
// Calculate scaled versions of the bounds of mHitRegion and mMaybeHitRegion
// for quick access in FindPaintedLayerFor().