Implement CSS Emphasis Marks for complex text

Source/platform/fonts/harfbuzz/HarfBuzzShaper.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/unicode/CharacterNames.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class Font;
 class SimpleFontData;
-
 class HarfBuzzShaper FINAL {
 public:
     enum NormalizeMode {
         DoNotNormalizeMirrorChars,
         NormalizeMirrorChars
     };
 
-    HarfBuzzShaper(const Font*, const TextRun&);
+    enum ForTextEmphasisOrNot {
+        NotForTextEmphasis,
+        ForTextEmphasis
+    };
+
+    HarfBuzzShaper(const Font*, const TextRun&, ForTextEmphasisOrNot = NotForTextEmphasis);
 
     void setDrawRange(int from, int to);
     bool shape(GlyphBuffer* = 0);
     FloatPoint adjustStartPoint(const FloatPoint&);
     float totalWidth() { return m_totalWidth; }
     int offsetForPosition(float targetX);
     FloatRect selectionRect(const FloatPoint&, int height, int from, int to);
 
 private:
     class HarfBuzzRun {
@@ skipping 59 matching lines @@
 
     // In complex text word-spacing affects each line-break, space (U+0020) and non-breaking space (U+00A0).
     static bool isCodepointSpace(UChar c) { return c == ' ' || c == noBreakSpace || c == '\n'; }
 
     void setFontFeatures();
 
     bool createHarfBuzzRuns();
     bool shapeHarfBuzzRuns();
     bool fillGlyphBuffer(GlyphBuffer*);
     void fillGlyphBufferFromHarfBuzzRun(GlyphBuffer*, HarfBuzzRun*, FloatPoint& firstOffsetOfNextRun);
+    void fillGlyphBufferForTextEmphasis(GlyphBuffer*, HarfBuzzRun* currentRun);
     void setGlyphPositionsForHarfBuzzRun(HarfBuzzRun*, hb_buffer_t*);
     void addHarfBuzzRun(unsigned startCharacter, unsigned endCharacter, const SimpleFontData*, UScriptCode);
 
     GlyphBufferAdvance createGlyphBufferAdvance(float, float);
 
     const Font* m_font;
     OwnPtr<UChar[]> m_normalizedBuffer;
     unsigned m_normalizedBufferLength;
     const TextRun& m_run;
 
     float m_wordSpacingAdjustment; // Delta adjustment (pixels) for each word break.
     float m_padding; // Pixels to be distributed over the line at word breaks.
     float m_padPerWordBreak; // Pixels to be added to each word break.
     float m_padError; // m_padPerWordBreak might have a fractional component. Since we only add a whole number of padding pixels at each word break we accumulate error. This is the number of pixels that we are behind so far.
     float m_letterSpacing; // Pixels to be added after each glyph.
 
     Vector<hb_feature_t, 4> m_features;
     Vector<OwnPtr<HarfBuzzRun>, 16> m_harfBuzzRuns;
 
     FloatPoint m_startOffset;
 
     int m_fromIndex;
     int m_toIndex;
 
+    ForTextEmphasisOrNot m_forTextEmphasis;
+
     float m_totalWidth;
 
     friend struct CachedShapingResults;
 };
 
 } // namespace WebCore
 
 #endif // HarfBuzzShaper_h