blob: 2754927c1238383647ee59f56f1401a33ab02ae2 [file] [log] [blame]
/*
* 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/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRRect.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.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(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.setBlendMode(SkBlendMode::kSrc);
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, kWidth, 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, SkClipOp::kDifference, true);
SkRect r = SkRect::MakeLTRB(4, 4, 292, 292);
SkRRect rr = SkRRect::MakeOval(r);
SkPaint paint;
paint.setMaskFilter(SkMaskFilter::MakeBlur(
kNormal_SkBlurStyle,
1.366025f));
paint.setColorFilter(SkColorFilters::Blend(SK_ColorRED, SkBlendMode::kSrcIn));
paint.setAntiAlias(true);
canvas->drawRRect(rr, paint);
canvas->restore();
canvas->restore();
canvas->restore();
}
private:
inline static constexpr int kWidth = 1164;
inline static constexpr int kHeight = 802;
using INHERITED = GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new BlurredClippedCircleGM;)
} // namespace skiagm