add bench for building the font cache

git-svn-id: http://skia.googlecode.com/svn/trunk@2590 2bbb7eff-a529-9590-31e7-b0007b416f81

bench/FontScalerBench.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2011 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 "SkGraphics.h"
+#include "SkPaint.h"
+#include "SkRandom.h"
+#include "SkString.h"
+
+extern bool gSkSuppressFontCachePurgeSpew;
+
+class FontScalerBench : public SkBenchmark {
+    SkString fName;
+    SkString fText;
+public:
+    FontScalerBench(void* param) : INHERITED(param) {
+        fName.set("fontscaler");
+        fText.set("abcdefghijklmnopqrstuvwxyz01234567890");
+    }
+
+protected:
+    virtual const char* onGetName() { return fName.c_str(); }
+    virtual void onDraw(SkCanvas* canvas) {
+        SkPaint paint;
+        this->setupPaint(&paint);
+
+        bool prev = gSkSuppressFontCachePurgeSpew;
+        gSkSuppressFontCachePurgeSpew = true;
+
+        // this is critical - we want to time the creation process, so we
+        // explicitly flush our cache before each run
+        SkGraphics::SetFontCacheUsed(0);
+        for (int ps = 9; ps <= 24; ps += 2) {
+            paint.setTextSize(SkIntToScalar(ps));
+            canvas->drawText(fText.c_str(), fText.size(),
+                             0, SkIntToScalar(20), paint);
+        }
+
+        gSkSuppressFontCachePurgeSpew = prev;
+    }
+private:
+    typedef SkBenchmark INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkBenchmark* Fact(void* p) { return SkNEW_ARGS(FontScalerBench, (p)); }
+
+static BenchRegistry gReg(Fact);

gyp/bench.gypi

@@ -22,6 +22,7 @@
     '../bench/BlurBench.cpp',
     '../bench/ChromeBench.cpp',
     '../bench/DecodeBench.cpp',
+    '../bench/FontScalerBench.cpp',
     '../bench/GradientBench.cpp',
     '../bench/MathBench.cpp',
     '../bench/MatrixBench.cpp',