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third_party/WebKit/Source/platform/fonts/shaping/SimpleShaper.h

 /*
  * Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2014 Google 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 27 matching lines @@
 class SimpleFontData;
 class TextRun;
 struct GlyphData;
 
 struct PLATFORM_EXPORT SimpleShaper : public Shaper {
     WTF_MAKE_FAST_ALLOCATED(SimpleShaper);
 public:
     SimpleShaper(const Font*, const TextRun&, const GlyphData* emphasisData = nullptr,
         HashSet<const SimpleFontData*>* fallbackFonts = nullptr, FloatRect* = nullptr);
 
-    unsigned advance(unsigned to, GlyphBuffer* = 0);
+    // TODO(sk.kumar): This function should be updated to take an unsigned value, and callers
+    // should be updated to not pass negative values. See: crbug.com/540047.
+    unsigned advance(int to, GlyphBuffer* = 0);
     bool advanceOneCharacter(float& width);
 
     const TextRun& run() const { return m_textRun; }
     float runWidthSoFar() const { return m_runWidthSoFar; }
     unsigned currentOffset() { return m_currentCharacter; }
 
 private:
     unsigned m_currentCharacter;
     float m_runWidthSoFar;
 
     struct CharacterData {
         UChar32 character;
         unsigned clusterLength;
         int characterOffset;
     };
 
     GlyphData glyphDataForCharacter(CharacterData&, bool normalizeSpace = false);
     float characterWidth(UChar32, const GlyphData&) const;
     float adjustSpacing(float, const CharacterData&);
 
     template <typename TextIterator>
     unsigned advanceInternal(TextIterator&, GlyphBuffer*);
 };
 
 } // namespace blink
 
 #endif