Fixing superscript and subscript baseline for tiny fonts in SVG

third_party/WebKit/Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.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 1703 matching lines @@
                         unsigned len,
                         const Font& f,
                         LayoutUnit xPos,
                         TextDirection textDirection,
                         HashSet<const SimpleFontData*>* fallbackFonts,
                         FloatRect* glyphBounds) const {
   ASSERT(from + len <= textLength());
   if (!textLength())
     return 0;
 
+  // This should not be needed here. Still if we remove it, the
+  // subpixel ascent / descent wont work.
+  f.getFontDescription().setSubpixelAscentDescent(true);
   const SimpleFontData* fontData = f.primaryFont();
   DCHECK(fontData);
   if (!fontData)
     return 0;
 
   float w;
   if (&f == &style()->font()) {
     if (!style()->preserveNewline() && !from && len == textLength()) {
       if (fallbackFonts) {
         ASSERT(glyphBounds);
@@ skipping 218 matching lines @@
   LayoutRect rect = LayoutRect(
       IntRect(firstRunX(), firstRunY(), linesBox.width(), linesBox.height()));
   LayoutBlock* block = containingBlock();
   if (block && hasTextBoxes())
     block->adjustChildDebugRect(rect);
 
   return rect;
 }
 
 }  // namespace blink