Walk render tree instead of render layers for paint.

sky/engine/core/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 428 matching lines @@
 
 void RenderBlock::markPositionedObjectsForLayout()
 {
     if (TrackedRendererListHashSet* positionedDescendants = positionedObjects()) {
         TrackedRendererListHashSet::iterator end = positionedDescendants->end();
         for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it)
             (*it)->setChildNeedsLayout();
     }
 }
 
-void RenderBlock::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+void RenderBlock::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, Vector<RenderBox*>& layers)
 {
     LayoutPoint adjustedPaintOffset = paintOffset + location();
 
     LayoutRect overflowBox;
     // Check if we need to do anything at all.
     // FIXME: Could eliminate the isDocumentElement() check if we fix background painting so that the RenderView
     // paints the root's background.
     if (!isDocumentElement()) {
         overflowBox = visualOverflowRect();
         overflowBox.moveBy(adjustedPaintOffset);
         if (!overflowBox.intersects(paintInfo.rect))
             return;
     }
 
     // There are some cases where not all clipped visual overflow is accounted for.
     // FIXME: reduce the number of such cases.
     ContentsClipBehavior contentsClipBehavior = ForceContentsClip;
     if (hasOverflowClip() && !shouldPaintSelectionGaps() && !hasCaret())
         contentsClipBehavior = SkipContentsClipIfPossible;
 
     bool pushedClip = pushContentsClip(paintInfo, adjustedPaintOffset, contentsClipBehavior);
-    paintObject(paintInfo, adjustedPaintOffset);
+    paintObject(paintInfo, adjustedPaintOffset, layers);
     if (pushedClip)
         popContentsClip(paintInfo, adjustedPaintOffset);
 }
 
-void RenderBlock::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+void RenderBlock::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOffset, Vector<RenderBox*>& layers)
 {
     for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
-        if (!child->hasSelfPaintingLayer())
-            child->paint(paintInfo, paintOffset);
+        if (child->hasSelfPaintingLayer())
+            layers.append(child);
+        else
+            child->paint(paintInfo, paintOffset, layers);
     }
 }
 
 static inline bool hasCursorCaret(const FrameSelection& selection, const RenderBlock* block)
 {
     return selection.caretRenderer() == block && selection.hasEditableStyle();
 }
 
 static inline bool hasDragCaret(const DragCaretController& dragCaretController, const RenderBlock* block)
 {
@@ skipping 12 matching lines @@
     if (hasCursorCaret(selection, this)) {
         selection.paintCaret(paintInfo.context, paintOffset, paintInfo.rect);
     }
 
     DragCaretController& dragCaretController = frame()->page()->dragCaretController();
     if (hasDragCaret(dragCaretController, this)) {
         dragCaretController.paintDragCaret(frame(), paintInfo.context, paintOffset, paintInfo.rect);
     }
 }
 
-void RenderBlock::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+void RenderBlock::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset, Vector<RenderBox*>& layers)
 {
     if (hasBoxDecorationBackground())
         paintBoxDecorationBackground(paintInfo, paintOffset);
 
-    paintChildren(paintInfo, paintOffset);
+    paintChildren(paintInfo, paintOffset, layers);
     paintSelection(paintInfo, paintOffset); // Fill in gaps in selection on lines and between blocks.
 
     if (style()->hasOutline() && !style()->outlineStyleIsAuto())
         paintOutline(paintInfo, LayoutRect(paintOffset, size()));
 
     paintCarets(paintInfo, paintOffset);
 }
 
 bool RenderBlock::shouldPaintSelectionGaps() const
 {
@@ skipping 1240 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink