ClipStrategyBench.cpp

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/*
 * Copyright 2017 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/SkPath.h"
 
class ClipStrategyBench : public Benchmark {
public:
    enum class Mode {
        kClipPath,
        kMask,
    };
 
    ClipStrategyBench(Mode mode, size_t count)
        : fMode(mode)
        , fCount(count)
        , fName("clip_strategy_"){
 
        if (fMode == Mode::kClipPath) {
            fName.append("path_");
            this->forEachClipCircle([&](float x, float y, float r) {
                fClipPath.addCircle(x, y, r);
            });
        } else {
            fName.append("mask_");
        }
        fName.appendf("%zu", count);
    }
 
    ~ClipStrategyBench() override = default;
 
protected:
    const char* onGetName() override {
        return fName.c_str();
    }
 
    void onDraw(int loops, SkCanvas* canvas) override {
        SkPaint p, srcIn;
        p.setAntiAlias(true);
        srcIn.setBlendMode(SkBlendMode::kSrcIn);
 
        for (int i = 0; i < loops; ++i) {
            SkAutoCanvasRestore acr(canvas, false);
 
            if (fMode == Mode::kClipPath) {
                canvas->save();
                canvas->clipPath(fClipPath, true);
            } else {
                canvas->saveLayer(nullptr, nullptr);
                this->forEachClipCircle([&](float x, float y, float r) {
                    canvas->drawCircle(x, y, r, p);
                });
                canvas->saveLayer(nullptr, &srcIn);
            }
            canvas->drawColor(SK_ColorGREEN);
        }
    }
 
private:
    template <typename Func>
    void forEachClipCircle(Func&& func) {
        auto q = static_cast<float>(this->getSize().width()) / (fCount + 1);
        for (size_t i = 1; i <= fCount; ++i) {
            auto x = q * i;
            func(x, x, q / 2);
        }
    }
 
    Mode     fMode;
    size_t   fCount;
    SkString fName;
    SkPath   fClipPath;
 
    using INHERITED = Benchmark;
};
 
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kClipPath, 1  );)
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kClipPath, 5  );)
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kClipPath, 10 );)
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kClipPath, 100);)
 
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kMask, 1  );)
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kMask, 5  );)
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kMask, 10 );)
DEF_BENCH( return new ClipStrategyBench(ClipStrategyBench::Mode::kMask, 100);)