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Bug 919144. Part 2: Force creation of a layer for every viewport with a displayport. r=mattwoodrow

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This ensures that for all fixed-pos content attached to a viewport with a
displayport, the viewport has a layer and the fixed-pos content's layer will be
a direct child of the viewport's layer.

--HG--
extra : rebase_source : da35bacad5518b94cb0b92a198d4f607cede4ac9
This commit is contained in:
Robert O'Callahan 2013-09-27 17:56:00 +12:00
parent fd9ce678dc
commit 3e2af1e7b8
1 changed files with 3 additions and 0 deletions
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3
layout/generic/nsSubDocumentFrame.cpp
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@ -350,11 +350,13 @@ nsSubDocumentFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
int32_t subdocAPD = presContext->AppUnitsPerDevPixel();
nsRect dirty;
bool haveDisplayPort = false;
if (subdocRootFrame) {
nsIDocument* doc = subdocRootFrame->PresContext()->Document();
nsIContent* root = doc ? doc->GetRootElement() : nullptr;
nsRect displayPort;
if (root && nsLayoutUtils::GetDisplayPort(root, &displayPort)) {
haveDisplayPort = true;
dirty = displayPort;
} else {
// get the dirty rect relative to the root frame of the subdoc
@ -376,6 +378,7 @@ nsSubDocumentFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
(presShell->GetXResolution() != 1.0 || presShell->GetYResolution() != 1.0);
bool constructZoomItem = subdocRootFrame && parentAPD != subdocAPD;
bool needsOwnLayer = constructResolutionItem || constructZoomItem ||
haveDisplayPort ||
presContext->IsRootContentDocument() || (sf && sf->IsScrollingActive());
nsDisplayList childItems;