Add a bench for SkBicubicImageFilter.

Review URL: https://codereview.appspot.com/7312056

git-svn-id: http://skia.googlecode.com/svn/trunk@7668 2bbb7eff-a529-9590-31e7-b0007b416f81

bench/BicubicBench.cpp

@@ -0,0 +1,62 @@
+/*
+ * 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 "SkRandom.h"
+#include "SkShader.h"
+#include "SkString.h"
+#include "SkBicubicImageFilter.h"
+
+// This bench exercises SkBicubicImageFilter, upsampling a 40x40 input to
+// 100x100, 400x100, 100x400, and 400x400.
+
+class BicubicBench : public SkBenchmark {
+    SkSize         fScale;
+    SkString       fName;
+
+public:
+    BicubicBench(void* param, float x, float y)
+        :  INHERITED(param), fScale(SkSize::Make(SkFloatToScalar(x), SkFloatToScalar(y))) {
+        fName.printf("bicubic_%gx%g",
+            SkScalarToFloat(fScale.fWidth), SkScalarToFloat(fScale.fHeight));
+    }
+
+protected:
+    virtual const char* onGetName() {
+        return fName.c_str();
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        SkPaint paint;
+        this->setupPaint(&paint);
+
+        paint.setAntiAlias(true);
+
+        SkRandom rand;
+        SkRect r = SkRect::MakeWH(40, 40);
+        SkAutoTUnref<SkImageFilter> bicubic(SkBicubicImageFilter::CreateMitchell(fScale));
+        paint.setImageFilter(bicubic);
+        canvas->save();
+        canvas->clipRect(r);
+        canvas->drawOval(r, paint);
+        canvas->restore();
+    }
+
+private:
+    typedef SkBenchmark INHERITED;
+};
+
+static SkBenchmark* Fact00(void* p) { return new BicubicBench(p, 10.0f, 10.0f); }
+static SkBenchmark* Fact01(void* p) { return new BicubicBench(p, 2.5f, 10.0f); }
+static SkBenchmark* Fact02(void* p) { return new BicubicBench(p, 10.0f, 2.5f); }
+static SkBenchmark* Fact03(void* p) { return new BicubicBench(p, 2.5f, 2.5f); }
+
+static BenchRegistry gReg00(Fact00);
+static BenchRegistry gReg01(Fact01);
+static BenchRegistry gReg02(Fact02);
+static BenchRegistry gReg03(Fact03);

gyp/bench.gypi

@@ -7,6 +7,7 @@
     '../bench/SkBenchmark.cpp',
 
     '../bench/AAClipBench.cpp',
+    '../bench/BicubicBench.cpp',
     '../bench/BitmapBench.cpp',
     '../bench/BitmapRectBench.cpp',
     '../bench/BlurBench.cpp',