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Bug 1017680 - Allow progressing painting for any 2D layer. r=Cwiiis

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This commit is contained in:
Kartikaya Gupta 2014-06-02 17:27:36 -04:00
parent 31441571eb
commit 6f87c8e03e
1 changed files with 4 additions and 39 deletions
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43
gfx/layers/client/ClientTiledThebesLayer.cpp
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@ -83,48 +83,13 @@ ClientTiledThebesLayer::BeginPaint()
mPaintData.mCompositionBounds.SetEmpty();
mPaintData.mCriticalDisplayPort.SetEmpty();
if (!GetBaseTransform().Is2DIntegerTranslation()) {
// Give up if the layer is transformed. The code below assumes that there
// is no transform set, and not making that assumption would cause huge
// complication to handle a quite rare case.
//
// FIXME The intention is to bail out of this function when there's a CSS
// transform set on the layer, but unfortunately there's no way to
// distinguish transforms due to scrolling from transforms due to
// CSS transforms.
//
// Because of this, there may be unintended behaviour when setting
// 2d CSS translations on the children of scrollable displayport
// layers.
if (!GetBaseTransform().Is2D()) {
// Give up if there is a complex CSS transform on the layer. We might
// eventually support these but for now it's too complicated to handle
// given that it's a pretty rare scenario.
return;
}
#ifdef MOZ_WIDGET_ANDROID
// Subframes on Fennec are not async scrollable because they have no displayport.
// However, the code in RenderLayer() picks up a displayport from the nearest
// scrollable ancestor container layer anyway, which is incorrect for Fennec. This
// behaviour results in the subframe getting clipped improperly and perma-blank areas
// while scrolling the subframe. To work around this, we detect if this layer is
// the primary scrollable layer and disable the tiling behaviour if it is not.
bool isPrimaryScrollableThebesLayer = false;
if (Layer* scrollable = ClientManager()->GetPrimaryScrollableLayer()) {
if (GetParent() == scrollable) {
for (Layer* child = scrollable->GetFirstChild(); child; child = child->GetNextSibling()) {
if (child->GetType() == Layer::TYPE_THEBES) {
if (child == this) {
// |this| is the first thebes layer child of the GetPrimaryScrollableLayer()
isPrimaryScrollableThebesLayer = true;
}
break;
}
}
}
}
if (!isPrimaryScrollableThebesLayer) {
return;
}
#endif
// Get the metrics of the nearest scrollable layer and the nearest layer
// with a displayport.
ContainerLayer* scrollAncestor = nullptr;