impl charsToGlyphs for freetype

bench/CmapBench.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBenchmark.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
@@ skipping 35 matching lines @@
     SkTypeface::Encoding encoding = paint2Encoding(paint);
     uint16_t glyphs[NGLYPHS];
     SkASSERT(glyphCount <= NGLYPHS);
     
     SkTypeface* face = paint.getTypeface();
     for (int i = 0; i < LOOP; ++i) {
         face->charsToGlyphs(text, encoding, glyphs, glyphCount);
     }
 }
 
+static void charsToGlyphsNull_proc(const SkPaint& paint, const void* text,
+                                   size_t len, int glyphCount) {
+    SkTypeface::Encoding encoding = paint2Encoding(paint);
+    
+    SkTypeface* face = paint.getTypeface();
+    for (int i = 0; i < LOOP; ++i) {
+        face->charsToGlyphs(text, encoding, NULL, glyphCount);
+    }
+}
+
 class CMAPBench : public SkBenchmark {
     TypefaceProc fProc;
     SkString     fName;
     char         fText[NGLYPHS];
     SkPaint      fPaint;
 
 public:
     CMAPBench(void* param, TypefaceProc proc, const char name[]) : SkBenchmark(param) {
         fProc = proc;
         fName.printf("cmap_%s", name);
         
         for (int i = 0; i < NGLYPHS; ++i) {
             // we're just jamming values into utf8, so we must keep it legal
-            fText[i] = i;
+            fText[i] = 'A' + i;
         }
         fPaint.setTypeface(SkTypeface::RefDefault())->unref();
     }
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return fName.c_str();
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         fProc(fPaint, fText, sizeof(fText), NGLYPHS);
     }
 
 private:
 
     typedef SkBenchmark INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new CMAPBench(p, containsText_proc, "paint_containsText"); )
 DEF_BENCH( return new CMAPBench(p, textToGlyphs_proc, "paint_textToGlyphs"); )
 DEF_BENCH( return new CMAPBench(p, charsToGlyphs_proc, "face_charsToGlyphs"); )
+DEF_BENCH( return new CMAPBench(p, charsToGlyphsNull_proc, "face_charsToGlyphs_null"); )