Track the region where text is painted.

Source/core/rendering/RenderListMarker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2010 Daniel Bates (dbates@intudata.com)
  *
  * 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 1259 matching lines @@
     if (!style()->isHorizontalWritingMode()) {
         marker.moveBy(roundedIntPoint(-boxOrigin));
         marker = marker.transposedRect();
         marker.moveBy(IntPoint(roundToInt(box.x()), roundToInt(box.y() - logicalHeight())));
         stateSaver.save();
         context->translate(marker.x(), marker.maxY());
         context->rotate(static_cast<float>(deg2rad(90.)));
         context->translate(-marker.x(), -marker.maxY());
     }
 
+    TextRunPaintInfo textRunPaintInfo(textRun);
+    textRunPaintInfo.bounds = marker;
     IntPoint textOrigin = IntPoint(marker.x(), marker.y() + style()->fontMetrics().ascent());
 
-    if (type == Asterisks || type == Footnotes)
-        context->drawText(font, textRun, textOrigin);
+    if (type == Asterisks || type == Footnotes) {
+        context->drawText(font, textRunPaintInfo, textOrigin);
+    }
     else {
         // Text is not arbitrary. We can judge whether it's RTL from the first character,
         // and we only need to handle the direction RightToLeft for now.
         bool textNeedsReversing = direction(m_text[0]) == RightToLeft;
         StringBuilder reversedText;
         if (textNeedsReversing) {
             int length = m_text.length();
             reversedText.reserveCapacity(length);
             for (int i = length - 1; i >= 0; --i)
                 reversedText.append(m_text[i]);
             textRun.setText(reversedText.characters(), length);
         }
 
         const UChar suffix = listMarkerSuffix(type, m_listItem->value());
         if (style()->isLeftToRightDirection()) {
-            int width = font.width(textRun);
-            context->drawText(font, textRun, textOrigin);
+            context->drawText(font, textRunPaintInfo, textOrigin);
+
             UChar suffixSpace[2] = { suffix, ' ' };
-            context->drawText(font, RenderBlock::constructTextRun(this, font, suffixSpace, 2, style()), textOrigin + IntSize(width, 0));
+            TextRun suffixRun = RenderBlock::constructTextRun(this, font, suffixSpace, 2, style());
+            TextRunPaintInfo suffixRunInfo(suffixRun);
+            suffixRunInfo.bounds = marker;
+            context->drawText(font, suffixRunInfo, textOrigin + IntSize(font.width(textRun), 0));
         } else {
             UChar spaceSuffix[2] = { ' ', suffix };
-            TextRun spaceSuffixRun = RenderBlock::constructTextRun(this, font, spaceSuffix, 2, style());
-            int width = font.width(spaceSuffixRun);
-            context->drawText(font, spaceSuffixRun, textOrigin);
-            context->drawText(font, textRun, textOrigin + IntSize(width, 0));
+            TextRun suffixRun = RenderBlock::constructTextRun(this, font, spaceSuffix, 2, style());
+            TextRunPaintInfo suffixRunInfo(suffixRun);
+            suffixRunInfo.bounds = marker;
+            context->drawText(font, suffixRunInfo, textOrigin);
+
+            context->drawText(font, textRunPaintInfo, textOrigin + IntSize(font.width(suffixRun), 0));
         }
     }
 }
 
 void RenderListMarker::layout()
 {
     StackStats::LayoutCheckPoint layoutCheckPoint;
     ASSERT(needsLayout());
  
     if (isImage()) {
@@ skipping 522 matching lines @@
 void RenderListMarker::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::Rendering);
     RenderBox::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_text, "text");
     info.addMember(m_image, "image");
     info.addMember(m_listItem, "listItem");
 }
 
 } // namespace WebCore