Implement CSS Emphasis Marks for complex text

Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp

 /*
  * Copyright (c) 2007, 2008, 2010 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 167 matching lines @@
 
     GlyphBuffer glyphBuffer;
     HarfBuzzShaper shaper(this, runInfo.run);
     shaper.setDrawRange(runInfo.from, runInfo.to);
     if (!shaper.shape(&glyphBuffer))
         return;
     FloatPoint adjustedPoint = shaper.adjustStartPoint(point);
     drawGlyphBuffer(gc, runInfo, glyphBuffer, adjustedPoint);
 }
 
-void Font::drawEmphasisMarksForComplexText(GraphicsContext* /* context */, const TextRunPaintInfo& /* runInfo */, const AtomicString& /* mark */, const FloatPoint& /* point */) const
+void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const
 {
-    notImplemented();
+    GlyphBuffer glyphBuffer;
+
+    float initialAdvance = getGlyphsAndAdvancesForComplexText(runInfo.run, runInfo.from, runInfo.to, glyphBuffer, ForTextEmphasis);
+
+    if (glyphBuffer.isEmpty())
+        return;
+
+    drawEmphasisMarks(context, runInfo, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
+}
+
+float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
+{
+    HarfBuzzShaper shaper(this, run, ForTextEmphasis); // TODO: forTextEmphasis argument? Nullify space & separator glyphs
+    shaper.setDrawRange(from, to);
+    if (!shaper.shape(&glyphBuffer))
+        return 0;
+
+    // TODO: rtl()? Get this initial value?
+    return 0;
 }
 
 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* /* fallbackFonts */, GlyphOverflow* /* glyphOverflow */) const
 {
     HarfBuzzShaper shaper(this, run);
     if (!shaper.shape())
         return 0;
     return shaper.totalWidth();
 }
 
@@ skipping 12 matching lines @@
                                             const FloatPoint& point, int height,
                                             int from, int to) const
 {
     HarfBuzzShaper shaper(this, run);
     if (!shaper.shape())
         return FloatRect();
     return shaper.selectionRect(point, height, from, to);
 }
 
 } // namespace WebCore