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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 "gm.h"
#include "SkBitmap.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkXfermode.h"
namespace skiagm {
/**
* Renders overlapping circles with random SkXfermode::Modes against a checkerboard.
*/
class MixedXfermodesGM : public GM {
public:
MixedXfermodesGM() {
static uint32_t kCheckerPixelData[] = { 0xFFFFFFFF, 0xFFCCCCCC, 0xFFCCCCCC, 0xFFFFFFFF };
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, 2, 2, 2 * sizeof(uint32_t));
bitmap.allocPixels();
bitmap.lockPixels();
memcpy(bitmap.getPixels(), kCheckerPixelData, sizeof(kCheckerPixelData));
bitmap.unlockPixels();
fBG.reset(SkShader::CreateBitmapShader(bitmap,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode));
SkASSERT(NULL != fBG);
SkMatrix lm;
lm.setScale(SkIntToScalar(20), SkIntToScalar(20));
fBG->setLocalMatrix(lm);
}
protected:
virtual SkString onShortName() {
return SkString("mixed_xfermodes");
}
virtual SkISize onISize() {
return make_isize(790, 640);
}
virtual void onDraw(SkCanvas* canvas) {
SkPaint bgPaint;
bgPaint.setShader(fBG.get());
canvas->drawPaint(bgPaint);
SkISize size = canvas->getDeviceSize();
SkScalar areaSqrt = SkScalarSqrt((SkIntToScalar(size.fWidth * size.fHeight)));
SkScalar minR = areaSqrt / 10;
SkScalar maxR = areaSqrt / 4;
SkMWCRandom random;
for (int i = 0; i < kNumCircles; ++i) {
SkScalar cx = random.nextRangeScalar(0, SkIntToScalar(size.fWidth));
SkScalar cy = random.nextRangeScalar(0, SkIntToScalar(size.fHeight));
SkScalar r = random.nextRangeScalar(minR, maxR);
SkColor color = random.nextU();
SkXfermode::Mode mode =
static_cast<SkXfermode::Mode>(random.nextULessThan(SkXfermode::kLastMode + 1));
// FIXME: Currently testing kDarken on GPU.
mode = SkXfermode::kDarken_Mode;
SkPaint p;
p.setAntiAlias(true);
p.setColor(color);
p.setXfermodeMode(mode);
canvas->drawCircle(cx, cy, r, p);
}
// FIXME: Remove text draw once this GM is finished.
SkPaint txtPaint;
txtPaint.setTextSize(areaSqrt / 20);
txtPaint.setAntiAlias(true);
static const char kTxt[] = "Work in progres... Do not baseline.";
canvas->drawText(kTxt, strlen(kTxt),
areaSqrt/50,
SkIntToScalar(size.fHeight / 2),
txtPaint);
}
private:
enum {
kMinR = 10,
kMaxR = 50,
kNumCircles = 50,
};
SkAutoTUnref<SkShader> fBG;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new MixedXfermodesGM; }
static GMRegistry reg(MyFactory);
}
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