This patch does several things. Sorry.
In BuildDisplayList implementations, instead of wrapping display items in nsDisplayClip, we
push clip state onto the nsDisplayListBuilder and give the display items an
explicit clip when they're created.
In FrameLayerBuilder, we use the explicit clips we find on display items instead of
computing our own.
We remove nsDisplayClip and everything that depends on it.
We remove ExplodeAnonymousChildLists. With nsDisplayClip gone, and
nsDisplayOptionEventGrabber removed in a previous patch, there are no
anonymous child lists.
nsDisplayItem::TryMerge implementations need to make sure they have the same
clip before being merged.
I ripped out the part of PruneDisplayListForExtraPage that adjusts clip rects.
As far as I can tell, it isn't actually necessary.
--HG--
extra : rebase_source : 6f3988b385d0ac54ab26fad10b12173884441f48
We currently set the visible region on most container layers twice: once in
BuildContainerLayerFor, where we don't take clipping from ancestors into
account, and then later ProcessDisplayItems calls RestrictVisibleRegionForLayer
which does take ancestor clipping into account. This causes unnecessary
Mutated()s.
In this patch we partially fix this by forcing transform layers to take
account of their ancestor clipping when they set the visible region in
BuildContainerLayerFor. For those layers we don't need to apply
ancestor clipping in ProcessDisplayItems. This is done in a rather
ugly way, by passing the ancestor clip rect as an extra field of
ContainerParameters. To preserve the optimization that prerendered
elements are treated as fully visible regardless of ancestor clipping,
we have to add a flag to turn that clipping off in BuildContainerLayerFor.
In bug 841192 we will be able to fix this in a much nicer way, because we can
get the ancestor clip directly off the nsDisplayItem passed to
BuildContainerLayerFor. But this approach is needed for the B2G18 branch.
--HG--
extra : rebase_source : 26fbe55db84ab96e1e358b8803b0563f42590836
Except for the changes in:
layout/generic/nsIFrame.h (part)
layout/style/nsComputedDOMStyle.h (all)
layout/style/nsRuleNode.cpp (part)
layout/style/nsStyleContext.cpp (part)
layout/style/nsStyleContext.h (part)
(see patch 3b in the bug), this patch was written with the sed script:
s/\<GetStyle\(Font\|Color\|List\|Text\|Visibility\|Quotes\|UserInterface\|TableBorder\|SVG\|Background\|Position\|TextReset\|Display\|Content\|UIReset\|Table\|Margin\|Padding\|Border\|Outline\|XUL\|SVGReset\|Column\)\>/Style\1/g
Previous patches in this bug enabled the nsDisplayCanvasBackground
background-caching optimization for the test 402807-1.html. That exposed
an existing bug where we don't snap the background image to pixel
boundaries when drawing through that path. This patch fixes it.
This patch also stops the IsSingleFixedPositionImage path from using
mDestRect, returning the rect as an out-parameter instead.
--HG--
extra : rebase_source : b7a496dfc7584dd8c73cddd0809fc5aa31992d53
Renames GetList to GetSameCoordinateSystemChildren, and adds an assertion
to verify that the children have the same reference frame as the parent.
Adds nsDisplayList::GetChildren to return whatever children there are.
Obsoletes nsDisplayTransform::GetStoredList.
