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LibWeb: Respect CSS z-index property while painting
To support z-ordering when painting, the layout tree now has a parallel sparse tree of stacking contexts. The rules for which layout boxes establish a stacking context are a bit complex, but the intent is to encapsulate the decision making into establishes_stacking_context(). When we paint, we start from the ICB (LayoutDocument) who always has a StackingContext and then paint the tree of StackingContexts where each node has its children sorted by z-index. This is pretty crude, but gets the basic job done. Note that this does not yet support hit testing; hit testing is still done using a naive treewalk from the root.
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11 changed files with 222 additions and 3 deletions
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@ -94,6 +94,7 @@ set(SOURCES
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Layout/LayoutWidget.cpp
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Layout/LineBox.cpp
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Layout/LineBoxFragment.cpp
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Layout/StackingContext.cpp
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LayoutTreeModel.cpp
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Loader/FrameLoader.cpp
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Loader/ImageLoader.cpp
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