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Bug 1026756 - Detect when a scroll offset update is going to remove checkerboarding, and don't leave things in a low-precision state. r=Cwiiis

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Kartikaya Gupta 2014-06-19 09:27:31 -04:00
parent 3f01e31e44
commit 46339827a7
1 changed files with 11 additions and 1 deletions
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12
gfx/layers/client/TiledContentClient.cpp
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@ -208,7 +208,17 @@ SharedFrameMetricsHelper::UpdateFromCompositorFrameMetrics(
// When not a low precision pass and the page is in danger of checker boarding
// abort update.
if (!aLowPrecision && !mProgressiveUpdateWasInDanger) {
if (AboutToCheckerboard(contentMetrics, compositorMetrics)) {
bool scrollUpdatePending = contentMetrics.GetScrollOffsetUpdated() &&
contentMetrics.GetScrollGeneration() != compositorMetrics.GetScrollGeneration();
// If scrollUpdatePending is true, then that means the content-side
// metrics has a new scroll offset that is going to be forced into the
// compositor but it hasn't gotten there yet.
// Even though right now comparing the metrics might indicate we're
// about to checkerboard (and that's true), the checkerboarding will
// disappear as soon as the new scroll offset update is processed
// on the compositor side. To avoid leaving things in a low-precision
// paint, we need to detect and handle this case (bug 1026756).
if (!scrollUpdatePending && AboutToCheckerboard(contentMetrics, compositorMetrics)) {
mProgressiveUpdateWasInDanger = true;
return true;
}