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Lots of time spent maintaining nsDisplayLayerEventRegions (#1116)

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* Simplify the dispatch-to-content region

Simplify the dispatch-to-content region in nsDisplayLayerEventRegions::AddFrame() and AddInactiveScrollPort() if it starts to get large.

* tabs to spaces
This commit is contained in:
win7-7 2019-05-24 20:00:07 +03:00 • committed by Roy Tam
commit 64b6f74f89
1 changed files with 4 additions and 0 deletions
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4
layout/base/nsDisplayList.cpp
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@ -3808,12 +3808,14 @@ nsDisplayLayerEventRegions::AddFrame(nsDisplayListBuilder* aBuilder,
// region on scrollbar frames that won't be placed in their own layer. See
// bug 1213324 for details.
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, borderBox);
mDispatchToContentHitRegion.SimplifyOutward(8);
} else if (aFrame->GetType() == nsGkAtoms::objectFrame) {
// If the frame is a plugin frame and wants to handle wheel events as
// default action, we should add the frame to dispatch-to-content region.
nsPluginFrame* pluginFrame = do_QueryFrame(aFrame);
if (pluginFrame && pluginFrame->WantsToHandleWheelEventAsDefaultAction()) {
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, borderBox);
mDispatchToContentHitRegion.SimplifyOutward(8);
}
}
@ -3850,6 +3852,7 @@ nsDisplayLayerEventRegions::AddFrame(nsDisplayListBuilder* aBuilder,
}
if (alreadyHadRegions) {
mDispatchToContentHitRegion.OrWith(CombinedTouchActionRegion());
mDispatchToContentHitRegion.SimplifyOutward(8);
}
}
}
@ -3859,6 +3862,7 @@ nsDisplayLayerEventRegions::AddInactiveScrollPort(const nsRect& aRect)
{
mHitRegion.Or(mHitRegion, aRect);
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, aRect);
mDispatchToContentHitRegion.SimplifyOutward(8);
}
bool