Walk render tree instead of render layers for paint.

sky/engine/core/rendering/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 460 matching lines @@
 
     if (!emphasisMark.isEmpty()) {
         if (textStyle.emphasisMarkColor != textStyle.fillColor)
             context->setFillColor(textStyle.emphasisMarkColor);
         paintEmphasisMark(context, emphasisMark, emphasisMarkOffset, startOffset, endOffset, length, font, textRun, textOrigin, boxRect);
     }
 }
 
 } // namespace
 
-void InlineTextBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit /*lineTop*/, LayoutUnit /*lineBottom*/)
+void InlineTextBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit /*lineTop*/, LayoutUnit /*lineBottom*/, Vector<RenderBox*> layers)

[esprehn, 2015/02/05 23:47:00]

Vector<RenderBox*>&, you're making copies all over instead of passing by
reference.

 {
     if (isLineBreak() || m_truncation == cFullTruncation || !m_len)
         return;
 
     LayoutRect logicalVisualOverflow = logicalOverflowRect();
     LayoutUnit logicalStart = logicalVisualOverflow.x() + paintOffset.x();
     LayoutUnit logicalExtent = logicalVisualOverflow.width();
 
     LayoutUnit paintEnd = paintInfo.rect.maxX();
     LayoutUnit paintStart = paintInfo.rect.x();
@@ skipping 843 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj.renderName(), &obj);
     const int rendererCharacterOffset = 24;
     for (; printedCharacters < rendererCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace blink