PerlinNoiseBench.cpp

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/*
 * 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 "bench/Benchmark.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkShader.h"
#include "include/effects/SkPerlinNoiseShader.h"
 
class PerlinNoiseBench : public Benchmark {
    SkISize fSize;
 
public:
    PerlinNoiseBench()  {
        fSize = SkISize::Make(80, 80);
    }
 
protected:
    const char* onGetName() override {
        return "perlinnoise";
    }
 
    void onDraw(int loops, SkCanvas* canvas) override {
        this->test(loops, canvas, 0, 0, 0.1f, 0.1f, 3, 0, false);
    }
 
private:
    void drawClippedRect(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
        canvas->save();
        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
                         SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height())));
        SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
                                    SkIntToScalar(fSize.width()),
                                    SkIntToScalar(fSize.height()));
        canvas->drawRect(r, paint);
        canvas->restore();
    }
 
    void test(int loops, SkCanvas* canvas, int x, int y,
              float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
              bool stitchTiles) {
        SkPaint paint;
        paint.setShader(SkShaders::MakeFractalNoise(
                baseFrequencyX, baseFrequencyY, numOctaves, seed, stitchTiles ? &fSize : nullptr));
        for (int i = 0; i < loops; i++) {
            this->drawClippedRect(canvas, x, y, paint);
        }
    }
 
    using INHERITED = Benchmark;
};
 
///////////////////////////////////////////////////////////////////////////////
 
DEF_BENCH( return new PerlinNoiseBench(); )