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1 /*
2  * Copyright 2015 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "gm/gm.h"
9 #include "include/core/SkBlendMode.h"
10 #include "include/core/SkBlurTypes.h"
11 #include "include/core/SkCanvas.h"
12 #include "include/core/SkColor.h"
13 #include "include/core/SkColorFilter.h"
14 #include "include/core/SkMaskFilter.h"
15 #include "include/core/SkPaint.h"
16 #include "include/core/SkRRect.h"
17 #include "include/core/SkRect.h"
18 #include "include/core/SkScalar.h"
19 #include "include/core/SkSize.h"
20 #include "include/core/SkString.h"
21 #include "src/core/SkClipOpPriv.h"
22 
23 namespace skiagm {
24 
25 // This GM reproduces the precision artifacts seen in crbug.com/560651.
26 // It draws a largish blurred circle with its center clipped out.
27 class BlurredClippedCircleGM : public GM {
28 public:
BlurredClippedCircleGM()29     BlurredClippedCircleGM() {
30         this->setBGColor(0xFFCCCCCC);
31     }
32 
33 protected:
34 
onShortName()35     SkString onShortName() override {
36         return SkString("blurredclippedcircle");
37     }
38 
onISize()39     SkISize onISize() override {
40         return SkISize::Make(kWidth, kHeight);
41     }
42 
onDraw(SkCanvas * canvas)43     void onDraw(SkCanvas* canvas) override {
44         SkPaint whitePaint;
45         whitePaint.setColor(SK_ColorWHITE);
46         whitePaint.setBlendMode(SkBlendMode::kSrc);
47         whitePaint.setAntiAlias(true);
48 
49         // This scale exercises precision limits in the circle blur effect (crbug.com/560651)
50         constexpr float kScale = 2.0f;
51         canvas->scale(kScale, kScale);
52 
53         canvas->save();
54             SkRect clipRect1 = SkRect::MakeLTRB(0, 0,
55                                                 SkIntToScalar(kWidth), SkIntToScalar(kHeight));
56 
57             canvas->clipRect(clipRect1);
58 
59             canvas->save();
60 
61                 canvas->clipRect(clipRect1);
62                 canvas->drawRect(clipRect1, whitePaint);
63 
64                 canvas->save();
65 
66                     SkRect clipRect2 = SkRect::MakeLTRB(8, 8, 288, 288);
67                     SkRRect clipRRect = SkRRect::MakeOval(clipRect2);
68                     canvas->clipRRect(clipRRect, kDifference_SkClipOp, true);
69 
70                     SkRect r = SkRect::MakeLTRB(4, 4, 292, 292);
71                     SkRRect rr = SkRRect::MakeOval(r);
72 
73                     SkPaint paint;
74 
75                     paint.setMaskFilter(SkMaskFilter::MakeBlur(
76                                             kNormal_SkBlurStyle,
77                                             1.366025f));
78                     paint.setColorFilter(SkColorFilters::Blend(SK_ColorRED,
79                                                                    SkBlendMode::kSrcIn));
80                     paint.setAntiAlias(true);
81 
82                     canvas->drawRRect(rr, paint);
83 
84                 canvas->restore();
85             canvas->restore();
86         canvas->restore();
87     }
88 
89 private:
90     static constexpr int kWidth = 1164;
91     static constexpr int kHeight = 802;
92 
93     using INHERITED = GM;
94 };
95 
96 //////////////////////////////////////////////////////////////////////////////
97 
98 DEF_GM(return new BlurredClippedCircleGM;)
99 }  // namespace skiagm
100