skia2/gm/blurredclippedcircle.cpp
2016-09-20 08:42:39 -07:00

93 lines
2.8 KiB
C++

/*
* Copyright 2015 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 "SkBlurMaskFilter.h"
#include "SkColorFilter.h"
#include "SkPaint.h"
#include "SkRRect.h"
namespace skiagm {
// This GM reproduces the precision artifacts seen in crbug.com/560651.
// It draws a largish blurred circle with its center clipped out.
class BlurredClippedCircleGM : public GM {
public:
BlurredClippedCircleGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
}
protected:
SkString onShortName() override {
return SkString("blurredclippedcircle");
}
SkISize onISize() override {
return SkISize::Make(kWidth, kHeight);
}
void onDraw(SkCanvas* canvas) override {
SkPaint whitePaint;
whitePaint.setColor(SK_ColorWHITE);
whitePaint.setXfermode(SkXfermode::Make(SkXfermode::kSrc_Mode));
whitePaint.setAntiAlias(true);
// This scale exercises precision limits in the circle blur effect (crbug.com/560651)
constexpr float kScale = 2.0f;
canvas->scale(kScale, kScale);
canvas->save();
SkRect clipRect1 = SkRect::MakeLTRB(0, 0,
SkIntToScalar(kWidth), SkIntToScalar(kHeight));
canvas->clipRect(clipRect1);
canvas->save();
canvas->clipRect(clipRect1);
canvas->drawRect(clipRect1, whitePaint);
canvas->save();
SkRect clipRect2 = SkRect::MakeLTRB(8, 8, 288, 288);
SkRRect clipRRect = SkRRect::MakeOval(clipRect2);
canvas->clipRRect(clipRRect, SkCanvas::kDifference_Op, true);
SkRect r = SkRect::MakeLTRB(4, 4, 292, 292);
SkRRect rr = SkRRect::MakeOval(r);
SkPaint paint;
paint.setMaskFilter(SkBlurMaskFilter::Make(
kNormal_SkBlurStyle,
1.366025f,
SkBlurMaskFilter::kHighQuality_BlurFlag));
paint.setColorFilter(SkColorFilter::MakeModeFilter(
SK_ColorRED,
SkXfermode::kSrcIn_Mode));
paint.setAntiAlias(true);
canvas->drawRRect(rr, paint);
canvas->restore();
canvas->restore();
canvas->restore();
}
private:
static constexpr int kWidth = 1164;
static constexpr int kHeight = 802;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new BlurredClippedCircleGM;)
}