Added a few bench for some image filters

bench/DisplacementBench.cpp

Index: bench/DisplacementBench.cpp
===================================================================
--- bench/DisplacementBench.cpp	(revision 0)
+++ bench/DisplacementBench.cpp	(revision 0)
@@ -0,0 +1,171 @@
+/*
+ * 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 "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkDisplacementMapEffect.h"
+
+#define FILTER_WIDTH_SMALL  SkIntToScalar(32)
+#define FILTER_HEIGHT_SMALL SkIntToScalar(32)
+#define FILTER_WIDTH_LARGE  SkIntToScalar(256)
+#define FILTER_HEIGHT_LARGE SkIntToScalar(256)
+
+class DisplacementBaseBench : public SkBenchmark {
+public:
+    DisplacementBaseBench(void* param, bool small) :
+        INHERITED(param), fInitialized(false), fIsSmall(small) {
+    }
+
+protected:
+    virtual void onPreDraw() SK_OVERRIDE {
+        if (!fInitialized) {
+            make_bitmap();
+            make_checkerboard();
+            fInitialized = true;
+        }
+    }
+
+    void make_bitmap() {
+        const int w = isSmall() ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
+        const int h = isSmall() ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
+        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, w, h);
+        fBitmap.allocPixels();
+        SkDevice device(fBitmap);
+        SkCanvas canvas(&device);
+        canvas.clear(0x00000000);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setColor(0xFF884422);
+        paint.setTextSize(SkIntToScalar(96));
+        const char* str = "g";
+        canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(55), paint);
+    }
+
+    void make_checkerboard() {
+        const int w = isSmall() ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
+        const int h = isSmall() ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
+        fCheckerboard.setConfig(SkBitmap::kARGB_8888_Config, w, h);
+        fCheckerboard.allocPixels();
+        SkDevice device(fCheckerboard);
+        SkCanvas canvas(&device);
+        canvas.clear(0x00000000);
+        SkPaint darkPaint;
+        darkPaint.setColor(0xFF804020);
+        SkPaint lightPaint;
+        lightPaint.setColor(0xFF244484);
+        for (int y = 0; y < h; y += 16) {
+            for (int x = 0; x < w; 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();
+            }
+        }
+    }
+
+    void drawClippedBitmap(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
+        canvas->save();
+        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
+            SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
+        canvas->drawBitmap(fBitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
+        canvas->restore();
+    }
+
+    inline bool isSmall() const { return fIsSmall; }
+
+    SkBitmap fBitmap, fCheckerboard;
+private:
+    bool fInitialized;
+    bool fIsSmall;
+    typedef SkBenchmark INHERITED;
+};
+
+class DisplacementZeroBench : public DisplacementBaseBench {
+public:
+    DisplacementZeroBench(void* param, bool small) : INHERITED(param, small) {
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return isSmall() ? "displacement_zero_small" : "displacement_zero_large";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        SkAutoTUnref<SkImageFilter> displ(SkNEW_ARGS(SkBitmapSource, (fCheckerboard)));
+        // No displacement effect
+        paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+            (SkDisplacementMapEffect::kR_ChannelSelectorType,
+             SkDisplacementMapEffect::kG_ChannelSelectorType, 0.0f, displ)))->unref();
+        drawClippedBitmap(canvas, 0, 0, paint);
+    }
+
+private:
+    typedef DisplacementBaseBench INHERITED;
+};
+
+class DisplacementAlphaBench : public DisplacementBaseBench {
+public:
+    DisplacementAlphaBench(void* param, bool small) : INHERITED(param, small) {
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return isSmall() ? "displacement_alpha_small" : "displacement_alpha_large";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        SkAutoTUnref<SkImageFilter> displ(SkNEW_ARGS(SkBitmapSource, (fCheckerboard)));
+        // Displacement, with 1 alpha component (which isn't pre-multiplied)
+        paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+            (SkDisplacementMapEffect::kB_ChannelSelectorType,
+             SkDisplacementMapEffect::kA_ChannelSelectorType, 16.0f, displ)))->unref();
+        drawClippedBitmap(canvas, 100, 0, paint);
+    }
+
+private:
+    typedef DisplacementBaseBench INHERITED;
+};
+
+class DisplacementFullBench : public DisplacementBaseBench {
+public:
+    DisplacementFullBench(void* param, bool small) : INHERITED(param, small) {
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return isSmall() ? "displacement_full_small" : "displacement_full_large";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        SkAutoTUnref<SkImageFilter> displ(SkNEW_ARGS(SkBitmapSource, (fCheckerboard)));
+        // Displacement, with 2 non-alpha components
+        paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+            (SkDisplacementMapEffect::kR_ChannelSelectorType,
+             SkDisplacementMapEffect::kB_ChannelSelectorType, 32.0f, displ)))->unref();
+        drawClippedBitmap(canvas, 200, 0, paint);
+    }
+
+private:
+    typedef DisplacementBaseBench INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+DEF_BENCH( return new DisplacementZeroBench(p, true); )
+DEF_BENCH( return new DisplacementAlphaBench(p, true); )
+DEF_BENCH( return new DisplacementFullBench(p, true); )
+DEF_BENCH( return new DisplacementZeroBench(p, false); )
+DEF_BENCH( return new DisplacementAlphaBench(p, false); )
+DEF_BENCH( return new DisplacementFullBench(p, false); )
+