Implement TrueType kerning support for HarfBuzz text path.

Source/core/platform/graphics/harfbuzz/HarfBuzzFaceCoreText.cpp

 /*
  * 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 67 matching lines @@
     CGGlyph cgGlyph = glyph;
     if (CTFontGetBoundingRectsForGlyphs(ctFont, kCTFontDefaultOrientation, &cgGlyph, &cgRect, 1) == CGRectNull)
         return false;
     extents->x_bearing = floatToHarfBuzzPosition(cgRect.origin.x);
     extents->y_bearing = -floatToHarfBuzzPosition(cgRect.origin.y);
     extents->width = floatToHarfBuzzPosition(cgRect.size.width);
     extents->height = floatToHarfBuzzPosition(cgRect.size.height);
     return true;
 }
 
-static hb_font_funcs_t* harfBuzzCoreTextGetFontFuncs()
+static hb_font_funcs_t* harfBuzzCoreTextGetFontFuncs(const TypesettingFeatures&)
 {
     static hb_font_funcs_t* harfBuzzCoreTextFontFuncs = 0;
 
     if (!harfBuzzCoreTextFontFuncs) {
         harfBuzzCoreTextFontFuncs = hb_font_funcs_create();
         hb_font_funcs_set_glyph_func(harfBuzzCoreTextFontFuncs, getGlyph, 0, 0);
         hb_font_funcs_set_glyph_h_advance_func(harfBuzzCoreTextFontFuncs, getGlyphHorizontalAdvance, 0, 0);
         hb_font_funcs_set_glyph_h_origin_func(harfBuzzCoreTextFontFuncs, getGlyphHorizontalOrigin, 0, 0);
         hb_font_funcs_set_glyph_extents_func(harfBuzzCoreTextFontFuncs, getGlyphExtents, 0, 0);
         hb_font_funcs_make_immutable(harfBuzzCoreTextFontFuncs);
@@ skipping 23 matching lines @@
 
 hb_face_t* HarfBuzzFace::createFace()
 {
     // It seems that CTFontCopyTable of MacOSX10.5 sdk doesn't work for
     // OpenType layout tables(GDEF, GSUB, GPOS). Use CGFontCopyTableForTag instead.
     hb_face_t* face = hb_face_create_for_tables(harfBuzzCoreTextGetTable, m_platformData->cgFont(), 0);
     ASSERT(face);
     return face;
 }
 
-hb_font_t* HarfBuzzFace::createFont()
+hb_font_t* HarfBuzzFace::createFont(const TypesettingFeatures& features)
 {
     hb_font_t* font = hb_font_create(m_face);
-    hb_font_set_funcs(font, harfBuzzCoreTextGetFontFuncs(), m_platformData, 0);
+    hb_font_set_funcs(font, harfBuzzCoreTextGetFontFuncs(features), m_platformData, 0);
     const float size = m_platformData->m_size;
     hb_font_set_ppem(font, size, size);
     const int scale = (1 << 16) * static_cast<int>(size);
     hb_font_set_scale(font, scale, scale);
     hb_font_make_immutable(font);
     return font;
 }
 
 GlyphBufferAdvance HarfBuzzShaper::createGlyphBufferAdvance(float width, float height)
 {
     return CGSizeMake(width, height);
 }
 
 } // namespace WebCore