Adding 3D lut color filter

bench/ColorCubeBench.cpp

Index: bench/ColorCubeBench.cpp
diff --git a/bench/ColorCubeBench.cpp b/bench/ColorCubeBench.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..16ed4ce892f72950e7f5f08f0d52d559f466862e
--- /dev/null
+++ b/bench/ColorCubeBench.cpp
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "Benchmark.h"
+#include "SkCanvas.h"
+#include "SkColorCubeFilter.h"
+#include "SkGradientShader.h"
+
+class ColorCubeBench : public Benchmark {
+    SkISize fSize;
+    int fCubeDimension;
+    SkData* fCubeData;
+    SkBitmap fBitmap;
+
+public:
+    ColorCubeBench()
+     : fCubeDimension(0)
+     , fCubeData(NULL) {
+        fSize = SkISize::Make(2880, 1800); // 2014 Macbook Pro resolution
+    }
+
+    ~ColorCubeBench() {
+        SkSafeUnref(fCubeData);
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return "colorcube";
+    }
+
+    virtual void onPreDraw() SK_OVERRIDE {
+        if (!SkToBool(fCubeData)) {
+            this->makeCubeData();
+            this->make_bitmap();
+        }
+    }
+
+    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+        this->test(loops, canvas);
+    }
+
+    virtual SkIPoint onGetSize() SK_OVERRIDE {
+        return SkIPoint::Make(fSize.width(), fSize.height());
+    }
+
+private:
+    static SkShader* MakeLinear(const SkISize& size) {
+        const SkPoint pts[2] = {
+                { 0, 0 },
+                { SkIntToScalar(size.width()), SkIntToScalar(size.height()) }
+            };
+        static const SkColor colors[] = { SK_ColorYELLOW, SK_ColorBLUE };
+        return SkGradientShader::CreateLinear(
+            pts, colors, NULL, 2, SkShader::kRepeat_TileMode, 0, &SkMatrix::I());
+    }
+
+    void make_bitmap() {
+        fBitmap.allocN32Pixels(fSize.width(), fSize.height());
+        SkCanvas canvas(fBitmap);
+        canvas.clear(0x00000000);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        SkShader* shader = MakeLinear(fSize);
+        paint.setShader(shader);
+        SkRect r = { 0, 0, SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height()) };
+        canvas.drawRect(r, paint);
+        shader->unref();
+    }
+
+    void makeCubeData() {
+        fCubeDimension = 32;
+        fCubeData = SkData::NewUninitialized(sizeof(SkColor) *
+            fCubeDimension * fCubeDimension * fCubeDimension);
+        SkColor* pixels = (SkColor*)(fCubeData->writable_data());
+        SkAutoMalloc lutMemory(fCubeDimension);
+        uint8_t* lut = (uint8_t*)lutMemory.get();
+        const int maxIndex = fCubeDimension - 1;
+        for (int i = 0; i < fCubeDimension; ++i) {
+            // Make an invert lut, but the content of
+            // the lut shouldn't affect performance.
+            lut[i] = ((maxIndex - i) * 255) / maxIndex;
+        }
+        for (int r = 0; r < fCubeDimension; ++r) {
+            for (int g = 0; g < fCubeDimension; ++g) {
+                for (int b = 0; b < fCubeDimension; ++b) {
+                    pixels[(fCubeDimension * ((fCubeDimension * b) + g)) + r] =
+                        SkColorSetARGB(0xFF, lut[r], lut[g], lut[b]);
+                }
+            }
+        }
+    }
+
+    void test(const int loops, SkCanvas* canvas) {
+        SkAutoTUnref<SkColorFilter> colorCube(
+            SkColorCubeFilter::Create(fCubeData, fCubeDimension));
+        SkPaint paint;
+        paint.setColorFilter(colorCube);
+
+        for (int i = 0; i < loops; i++) {
+            canvas->drawBitmap(fBitmap, 0, 0, &paint);
+        }
+    }
+
+    typedef Benchmark INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+DEF_BENCH( return new ColorCubeBench(); )