add charsToGlyphs to SkTypeface

bench/CmapBench.cpp

Index: bench/CmapBench.cpp
diff --git a/bench/CmapBench.cpp b/bench/CmapBench.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9697477850e81a96586338c74eb4b295e6be4830
--- /dev/null
+++ b/bench/CmapBench.cpp
@@ -0,0 +1,93 @@
+/*
+ * 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"
+#include "SkTypeface.h"
+
+enum {
+    LOOP = SkBENCHLOOP(1000),
+    NGLYPHS = 100
+};
+
+static SkTypeface::Encoding paint2Encoding(const SkPaint& paint) {
+    SkPaint::TextEncoding enc = paint.getTextEncoding();
+    SkASSERT(SkPaint::kGlyphID_TextEncoding != enc);
+    return (SkTypeface::Encoding)enc;
+}
+
+typedef void (*TypefaceProc)(const SkPaint&, const void* text, size_t len,
+                             int glyphCount);
+
+static void containsText_proc(const SkPaint& paint, const void* text, size_t len,
+                              int glyphCount) {
+    for (int i = 0; i < LOOP; ++i) {
+        paint.containsText(text, len);
+    }
+}
+
+static void textToGlyphs_proc(const SkPaint& paint, const void* text, size_t len,
+                              int glyphCount) {
+    uint16_t glyphs[NGLYPHS];
+    SkASSERT(glyphCount <= NGLYPHS);
+
+    for (int i = 0; i < LOOP; ++i) {
+        paint.textToGlyphs(text, len, glyphs);
+    }
+}
+
+static void charsToGlyphs_proc(const SkPaint& paint, const void* text,
+                               size_t len, int glyphCount) {
+    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);
+    }
+}
+
+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;
+        }
+        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"); )
+