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/*
* Copyright 2012 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Benchmark.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
/**
* This bench mark tests the use case where the user writes the a canvas
* and then reads small chunks from it repeatedly. This can cause trouble
* for the GPU as readbacks are very expensive.
*/
class ReadPixBench : public Benchmark {
public:
ReadPixBench() {}
protected:
const char* onGetName() override {
return "readpix";
}
void onDraw(int loops, SkCanvas* canvas) override {
canvas->clear(SK_ColorBLACK);
SkISize size = canvas->getBaseLayerSize();
int offX = (size.width() - kWindowSize) / kNumStepsX;
int offY = (size.height() - kWindowSize) / kNumStepsY;
SkPaint paint;
paint.setColor(SK_ColorBLUE);
canvas->drawCircle(SkIntToScalar(size.width()/2),
SkIntToScalar(size.height()/2),
SkIntToScalar(size.width()/2),
paint);
SkBitmap bitmap;
bitmap.allocPixels(SkImageInfo::MakeN32Premul(kWindowSize, kWindowSize));
for (int i = 0; i < loops; i++) {
for (int x = 0; x < kNumStepsX; ++x) {
for (int y = 0; y < kNumStepsY; ++y) {
canvas->readPixels(bitmap.info(), bitmap.getPixels(), bitmap.rowBytes(),
x * offX, y * offY);
}
}
}
}
private:
static const int kNumStepsX = 30;
static const int kNumStepsY = 30;
static const int kWindowSize = 5;
typedef Benchmark INHERITED;
};
////////////////////////////////////////////////////////////////////////////////
DEF_BENCH( return new ReadPixBench(); )
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