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Bug 1022612. Part 25: We don't need to explicitly worry about displayports anymore when computing occlusion. r=mattwoodrow

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--HG--
extra : rebase_source : 22926330830072dd520ab41daa37c451bf35601d
This commit is contained in:
Robert O'Callahan 2014-06-09 16:48:02 +12:00
parent 775fd8f7d9
commit 62ab1efdda
1 changed files with 2 additions and 32 deletions
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34
layout/base/nsDisplayList.cpp
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@ -1114,39 +1114,9 @@ nsDisplayList::ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
aAllowVisibleRegionExpansion.Intersect(bounds))) {
anyVisible = true;
// If we're in a displayport, we need to make sure that fixed position
// items do not subtract from the visible region, as async scrolling
// may expose these occluded areas.
// If the item is fixed pos in the same document as the displayport
// then don't let it occlude this list. The only other case possible
// is that the fixed pos content is in a child document, in which it
// would scroll with the rest of the content.
bool occlude = true;
nsIPresShell* presShell = nullptr;
if (aDisplayPortFrame && item->IsInFixedPos()) {
if (item->Frame()->PresContext() == aDisplayPortFrame->PresContext()) {
occlude = false;
presShell = aDisplayPortFrame->PresContext()->PresShell();
}
}
nsRegion opaque = TreatAsOpaque(item, aBuilder);
if (occlude) {
// Subtract opaque item from the visible region
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque);
} else if (presShell &&
presShell->IsScrollPositionClampingScrollPortSizeSet() &&
!opaque.IsEmpty()) {
// We make an exception if the fixed position item would fully occlude
// the scroll position clamping scroll-port. In that case, it's very
// unlikely that it will become visible via async scrolling, so we let
// it occlude.
nsRect scrollClampingScrollPort(nsPoint(0, 0),
presShell->GetScrollPositionClampingScrollPortSize());
if (opaque.Contains(scrollClampingScrollPort)) {
aVisibleRegion->SetEmpty();
}
}
// Subtract opaque item from the visible region
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque);
}
AppendToBottom(item);
}