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Bug 1201625 - Special-case B2GDroid since it doesn't have a root content document. r=rbarker

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This commit is contained in:
Kartikaya Gupta 2015-09-03 23:18:52 -04:00
parent c8119b93cf
commit e815396b58
1 changed files with 12 additions and 2 deletions
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14
gfx/layers/composite/AsyncCompositionManager.cpp
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@ -647,7 +647,17 @@ AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer)
// bug 1036967 removed the (dead) call.
#if defined(MOZ_ANDROID_APZ)
if (metrics.IsRootContent()) {
bool rootContentLayer = metrics.IsRootContent();
#ifdef MOZ_B2GDROID
// B2GDroid is a special snowflake since it doesn't seem to have any root
// content document. However we still need to send a setFirstPaintViewport
// message, so we use the root of the layer tree as the root content layer
// instead. For the most part this should work fine; the Java code will just
// think the root layer is the "main" content, which in a manner of speaking,
// it is.
rootContentLayer = (aLayer->GetParent() == nullptr);
#endif // MOZ_B2GDROID
if (rootContentLayer) {
if (mIsFirstPaint) {
CSSToLayerScale geckoZoom = metrics.LayersPixelsPerCSSPixel().ToScaleFactor();
LayerIntPoint scrollOffsetLayerPixels = RoundedToInt(metrics.GetScrollOffset() * geckoZoom);
@ -659,7 +669,7 @@ AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer)
mIsFirstPaint = false;
mLayersUpdated = false;
}
#endif
#endif // MOZ_ANDROID_APZ
// Transform the current local clip by this APZC's async transform. If we're
// using containerful scrolling, then the clip is not part of the scrolled