Shape unicode-range: font faces in only one iteration

third_party/WebKit/Source/platform/fonts/shaping/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 35 matching lines @@
 #include "wtf/text/CharacterNames.h"
 
 #include <unicode/uscript.h>
 
 namespace blink {
 
 class Font;
 class GlyphBuffer;
 class SimpleFontData;
 class HarfBuzzShaper;
+class UnicodeRangeSet;
 
 // Shaping text runs is split into several stages: Run segmentation, shaping the
 // initial segment, identify shaped and non-shaped sequences of the shaping
 // result, and processing sub-runs by trying to shape them with a fallback font
 // until the last resort font is reached.
 //
 // Going through one example to illustrate the process: The following is a run of
 // vertical text to be shaped. After run segmentation in RunSegmenter it is split
 // into 4 segments. The segments indicated by the segementation results showing
 // the script, orientation information and small caps handling of the individual
@@ skipping 89 matching lines @@
 private:
     void setFontFeatures();
 
     void appendToHolesQueue(HolesQueueItemAction,
         unsigned startIndex,
         unsigned numCharacters);
     inline bool shapeRange(hb_buffer_t* harfBuzzBuffer,
         unsigned startIndex,
         unsigned numCharacters,
         const SimpleFontData* currentFont,
-        unsigned currentFontRangeFrom,
-        unsigned currentFontRangeTo,
+        PassRefPtr<UnicodeRangeSet> currentFontRangeSet,
         UScriptCode currentRunScript,
         hb_language_t);
     bool extractShapeResults(hb_buffer_t* harfBuzzBuffer,
         ShapeResult*,
         bool& fontCycleQueued,
         const HolesQueueItem& currentQueueItem,
         const SimpleFontData* currentFont,
         UScriptCode currentRunScript,
         bool isLastResort);
     bool collectFallbackHintChars(Vector<UChar32>& hint, bool needsList);
 
     void insertRunIntoShapeResult(ShapeResult*, PassOwnPtr<ShapeResult::RunInfo> runToInsert, unsigned startGlyph, unsigned numGlyphs, hb_buffer_t*);
 
     OwnPtr<UChar[]> m_normalizedBuffer;
     unsigned m_normalizedBufferLength;
 
     Vector<hb_feature_t, 4> m_features;
     Deque<HolesQueueItem> m_holesQueue;
 };
 
 
 } // namespace blink
 
 #endif // HarfBuzzShaper_h