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Bug 1187804 - When a layer is scrolled by multiple scroll frames, do an AlignFixedAndStickyLayers pass on its subtree for each of the scroll frames. r=kats

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This commit is contained in:
Botond Ballo 2015-08-14 20:26:59 -04:00
parent a54ac74577
commit 9598818879
1 changed files with 15 additions and 19 deletions
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34
gfx/layers/composite/AsyncCompositionManager.cpp
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@ -600,7 +600,6 @@ AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer)
Matrix4x4 oldTransform = aLayer->GetTransform();
Matrix4x4 combinedAsyncTransformWithoutOverscroll;
Matrix4x4 combinedAsyncTransform;
bool hasAsyncTransform = false;
LayerMargin fixedLayerMargins(0, 0, 0, 0);
@ -702,8 +701,22 @@ AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer)
ancestorMaskLayers.AppendElement(ancestorMaskLayer);
}
combinedAsyncTransformWithoutOverscroll *= asyncTransformWithoutOverscroll;
combinedAsyncTransform *= asyncTransform;
// For the purpose of aligning fixed and sticky layers, we disregard
// the overscroll transform as well as any OMTA transform when computing the
// 'aCurrentTransformForRoot' parameter. This ensures that the overscroll
// and OMTA transforms are not unapplied, and therefore that the visual
// effects apply to fixed and sticky layers. We do this by using
// GetTransform() as the base transform rather than GetLocalTransform(),
// which would include those factors.
Matrix4x4 transformWithoutOverscrollOrOmta = aLayer->GetTransform() *
AdjustForClip(asyncTransformWithoutOverscroll, aLayer);
// Since fixed/sticky layers are relative to their nearest scrolling ancestor,
// we use the ViewID from the bottommost scrollable metrics here.
AlignFixedAndStickyLayers(aLayer, aLayer, metrics.GetScrollId(), oldTransform,
transformWithoutOverscrollOrOmta, fixedLayerMargins);
}
if (hasAsyncTransform) {
@ -724,23 +737,6 @@ AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer)
maskLayer->GetLocalTransform() * combinedAsyncTransform);
}
const FrameMetrics& bottom = LayerMetricsWrapper::BottommostScrollableMetrics(aLayer);
MOZ_ASSERT(bottom.IsScrollable()); // must be true because hasAsyncTransform is true
// For the purpose of aligning fixed and sticky layers, we disregard
// the overscroll transform as well as any OMTA transform when computing the
// 'aCurrentTransformForRoot' parameter. This ensures that the overscroll
// and OMTA transforms are not unapplied, and therefore that the visual
// effects apply to fixed and sticky layers. We do this by using
// GetTransform() as the base transform rather than GetLocalTransform(),
// which would include those factors.
Matrix4x4 transformWithoutOverscrollOrOmta = aLayer->GetTransform() *
AdjustForClip(combinedAsyncTransformWithoutOverscroll, aLayer);
// Since fixed/sticky layers are relative to their nearest scrolling ancestor,
// we use the ViewID from the bottommost scrollable metrics here.
AlignFixedAndStickyLayers(aLayer, aLayer, bottom.GetScrollId(), oldTransform,
transformWithoutOverscrollOrOmta, fixedLayerMargins);
appliedTransform = true;
}