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Bug 1022612. Part 30: Expose IsConstructingScrollLayerForScrolledFrame and IsDisplayPortOpaque on nsDisplayScrollLayer. r=mattwoodrow

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--HG--
extra : rebase_source : 0eddaa98dae6ba5e5b15b818716bafd1811f16db
This commit is contained in:
Robert O'Callahan 2014-06-23 16:23:58 +12:00
parent 1ed8388eac
commit ff5b26dd8b
2 changed files with 48 additions and 12 deletions
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52
layout/base/nsDisplayList.cpp
View File

@ -3702,6 +3702,7 @@ nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
, mDisplayPortContentsOpaque(false)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
@ -3720,6 +3721,7 @@ nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
, mDisplayPortContentsOpaque(false)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
@ -3737,6 +3739,7 @@ nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
, mDisplayPortContentsOpaque(false)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
@ -3764,6 +3767,22 @@ nsDisplayScrollLayer::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
return nsDisplayWrapList::GetBounds(aBuilder, aSnap);
}
nsRect
nsDisplayScrollLayer::GetScrolledContentRectToDraw(nsDisplayListBuilder* aBuilder,
nsRect* aDisplayPort)
{
if (aDisplayPort) {
// The visible region for the children may be much bigger than the hole we
// are viewing the children from, so that the compositor process has enough
// content to asynchronously pan while content is being refreshed.
// XXX mScrollFrame seems wrong here; we should add the offset of the
// scrollport
return *aDisplayPort + mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame());
}
bool snap;
return GetBounds(aBuilder, &snap);
}
already_AddRefed<Layer>
nsDisplayScrollLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
@ -3780,9 +3799,26 @@ nsDisplayScrollLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
RecordFrameMetrics(mScrolledFrame, mScrollFrame, ReferenceFrame(), layer,
viewport, false, false, aContainerParameters);
if (mList.IsOpaque()) {
nsRect displayport;
bool usingDisplayport =
nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport);
mDisplayPortContentsOpaque = mList.GetBounds(aBuilder).Contains(
GetScrolledContentRectToDraw(aBuilder, usingDisplayport ? &displayport : nullptr));
} else {
mDisplayPortContentsOpaque = false;
}
return layer.forget();
}
bool
nsDisplayScrollLayer::IsConstructingScrollLayerForScrolledFrame(const nsIFrame* aScrolledFrame)
{
FrameProperties props = aScrolledFrame->Properties();
return reinterpret_cast<intptr_t>(props.Get(nsIFrame::ScrollLayerCount())) != 0;
}
bool
nsDisplayScrollLayer::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
{
@ -3801,20 +3837,12 @@ nsDisplayScrollLayer::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRect displayport;
bool usingDisplayPort =
nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport);
nsRegion childVisibleRegion;
if (usingDisplayPort) {
// The visible region for the children may be much bigger than the hole we
// are viewing the children from, so that the compositor process has enough
// content to asynchronously pan while content is being refreshed.
childVisibleRegion = displayport + mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame());
} else {
bool snap;
childVisibleRegion = GetBounds(aBuilder, &snap);
}
nsRect scrolledContentRect = GetScrolledContentRectToDraw(aBuilder,
usingDisplayPort ? &displayport : nullptr);
nsRect boundedRect =
childVisibleRegion.GetBounds().Intersect(mList.GetBounds(aBuilder));
nsRect boundedRect = scrolledContentRect.Intersect(mList.GetBounds(aBuilder));
nsRect allowExpansion = boundedRect.Intersect(aAllowVisibleRegionExpansion);
nsRegion childVisibleRegion = scrolledContentRect;
bool visible = mList.ComputeVisibilityForSublist(
aBuilder, &childVisibleRegion, boundedRect, allowExpansion,
usingDisplayPort ? mScrollFrame : nullptr);

8
layout/base/nsDisplayList.h
View File

@ -3025,6 +3025,8 @@ public:
// after merging, all the nsDisplayScrollLayers should flatten away.
intptr_t GetScrollLayerCount();
static bool IsConstructingScrollLayerForScrolledFrame(const nsIFrame* aScrolledFrame);
virtual nsIFrame* GetScrollFrame() { return mScrollFrame; }
virtual nsIFrame* GetScrolledFrame() { return mScrolledFrame; }
@ -3032,10 +3034,16 @@ public:
virtual void WriteDebugInfo(nsACString& aTo) MOZ_OVERRIDE;
#endif
bool IsDisplayPortOpaque() { return mDisplayPortContentsOpaque; }
protected:
nsRect GetScrolledContentRectToDraw(nsDisplayListBuilder* aBuilder,
nsRect* aDisplayPort);
nsIFrame* mScrollFrame;
nsIFrame* mScrolledFrame;
ViewID mScrollParentId;
bool mDisplayPortContentsOpaque;
};
/**