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Bug 936277 - Do not allow subframe displayports to get clipped away. r=tn

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This commit is contained in:
Botond Ballo 2013-11-07 19:36:59 -05:00
parent 63d7adad6b
commit 82fad9f25d
1 changed files with 16 additions and 0 deletions
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16
layout/generic/nsGfxScrollFrame.cpp
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@ -2311,6 +2311,22 @@ ScrollFrameHelper::BuildDisplayList(nsDisplayListBuilder* aBuilder,
if (usingDisplayport) {
nsRect clip = displayPort + aBuilder->ToReferenceFrame(mOuter);
// If we are using a display port, then ignore any pre-existing clip
// passed down from our parents, and use only the clip computed here
// based on the display port. The pre-existing clip would just defeat
// the purpose of a display port which is to paint regions that are not
// currently visible so that they can be brought into view asynchronously.
// Notes:
// - The pre-existing clip state will be restored when the
// AutoSaveRestore goes out of scope, so there is no permanent change
// to this clip state.
// - We still set a clip to the scroll port further below where we
// build the scroll wrapper. This doesn't prevent us from painting
// the entire displayport, but it lets the compositor know to
// clip to the scroll port after compositing.
clipState.Clear();
if (mClipAllDescendants) {
clipState.ClipContentDescendants(clip);
} else {