Added a few bench for some image filters

bench/BlendBench.cpp

Index: bench/BlendBench.cpp
===================================================================
--- bench/BlendBench.cpp	(revision 0)
+++ bench/BlendBench.cpp	(revision 0)
@@ -0,0 +1,106 @@
+/*
+ * 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 "SkBitmapSource.h"
+#include "SkBlendImageFilter.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+
+class BlendBench : public SkBenchmark {
+public:
+    BlendBench(void* param) : INHERITED(param) {
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return "blend";
+    }
+
+    virtual void onPreDraw() SK_OVERRIDE {
+        if (!fInitialized) {
+            make_bitmap();
+            make_checkerboard();
+            fInitialized = true;
+        }
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        canvas->clear(0x00000000);
+        SkPaint paint;
+        SkAutoTUnref<SkImageFilter> background(SkNEW_ARGS(SkBitmapSource, (fCheckerboard)));
+        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter,
+                (SkBlendImageFilter::kNormal_Mode, background)))->unref();

[Stephen White, 2013/04/15 15:34:21]

I think it would be better to break out each of these into separate benchmark
test cases.

[sugoi1, 2013/04/19 18:09:42]

Done.

+        drawClippedBitmap(canvas, paint, 0);
+        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter,
+                (SkBlendImageFilter::kMultiply_Mode, background)))->unref();
+        drawClippedBitmap(canvas, paint, 100);
+        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter,
+                (SkBlendImageFilter::kScreen_Mode, background)))->unref();
+        drawClippedBitmap(canvas, paint, 200);
+        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter,
+                (SkBlendImageFilter::kDarken_Mode, background)))->unref();
+        drawClippedBitmap(canvas, paint, 300);
+        paint.setImageFilter(SkNEW_ARGS(SkBlendImageFilter,
+                (SkBlendImageFilter::kLighten_Mode, background)))->unref();
+        drawClippedBitmap(canvas, paint, 400);
+    }
+
+private:
+    void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x) {
+        canvas->save();
+        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), 0,
+            SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
+        canvas->drawBitmap(fBitmap, SkIntToScalar(x), 0, &paint);
+        canvas->restore();
+    }
+
+    void make_bitmap() {
+        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
+        fBitmap.allocPixels();
+        SkDevice device(fBitmap);
+        SkCanvas canvas(&device);
+        canvas.clear(0x00000000);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setColor(0xD000D000);
+        paint.setTextSize(SkIntToScalar(96));
+        const char* str = "e";
+        canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
+    }
+
+    void make_checkerboard() {
+        fCheckerboard.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
+        fCheckerboard.allocPixels();
+        SkDevice device(fCheckerboard);
+        SkCanvas canvas(&device);
+        canvas.clear(0x00000000);
+        SkPaint darkPaint;
+        darkPaint.setColor(0xFF404040);
+        SkPaint lightPaint;
+        lightPaint.setColor(0xFFA0A0A0);
+        for (int y = 0; y < 80; y += 16) {
+          for (int x = 0; x < 80; x += 16) {
+            canvas.save();
+            canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
+            canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
+            canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
+            canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
+            canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
+            canvas.restore();
+          }
+        }
+    }
+
+    typedef SkBenchmark INHERITED;
+    SkBitmap fBitmap, fCheckerboard;
+    bool fInitialized;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+DEF_BENCH( return new BlendBench(p); )
+