1 /*
2 * Copyright 2016 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/SkBlurTypes.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkMaskFilter.h"
13 #include "include/core/SkPaint.h"
14 #include "include/core/SkPathBuilder.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkRefCnt.h"
17 #include "include/core/SkScalar.h"
18 #include "include/core/SkSize.h"
19 #include "include/core/SkString.h"
20 #include "include/utils/SkRandom.h"
21 #include "src/core/SkBlurMask.h"
22 #include "tools/timer/TimeUtils.h"
23 
24 /**
25  * In GM mode this draws an array of circles with different radii and different blur radii. Below
26  * each circle an almost-circle path is drawn with the same blur filter for comparison.
27  *
28  * In Sample mode this draws a single circle and almost-circle with animating radius and blur
29  * radius.
30  *
31  * Bench mode draws the same as GM mode but without the comparison almost-circle paths. It also
32  * slightly perturbs the blur and circle radii to stress caching of blurred profiles in GPU mode.
33  */
34 class BlurCircles2GM : public skiagm::GM {
35 public:
BlurCircles2GM()36     BlurCircles2GM() {
37         fAnimRadius = TimeUtils::PingPong(
38                 0, kRadiusPingPoingPeriod, kRadiusPingPoingShift, kMinRadius, kMaxRadius);
39         fAnimBlurRadius = TimeUtils::PingPong(0,
40                                               kBlurRadiusPingPoingPeriod,
41                                               kBlurRadiusPingPoingShift,
42                                               kMinBlurRadius,
43                                               kMaxBlurRadius);
44     }
45 
46 protected:
runAsBench() const47     bool runAsBench() const override { return true; }
48 
onShortName()49     SkString onShortName() override { return SkString("blurcircles2"); }
50 
onISize()51     SkISize onISize() override {
52         return SkISize::Make(730, 1350);
53     }
54 
onDraw(SkCanvas * canvas)55     void onDraw(SkCanvas* canvas) override {
56         constexpr SkScalar kMaxR = kMaxRadius + kMaxBlurRadius;
57 
58         auto almostCircleMaker = [] (SkScalar radius) {
59             return SkPathBuilder().addArc(SkRect::MakeXYWH(-radius, -radius, 2 * radius, 2 * radius), 0, 355)
60                                   .setIsVolatile(true)
61                                   .close()
62                                   .detach();
63         };
64 
65         auto blurMaker = [] (SkScalar radius) ->sk_sp<SkMaskFilter> {
66             return SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
67                                           SkBlurMask::ConvertRadiusToSigma(radius));
68         };
69 
70         SkPaint paint;
71         paint.setColor(SK_ColorBLACK);
72 
73         if (this->getMode() == kSample_Mode) {
74             paint.setMaskFilter(blurMaker(fAnimBlurRadius));
75             SkISize size = canvas->getBaseLayerSize();
76             SkPath almostCircle = almostCircleMaker(fAnimRadius);
77             canvas->save();
78                 canvas->translate(size.fWidth / 2.f, size.fHeight / 4.f);
79                 canvas->drawCircle(0, 0, fAnimRadius, paint);
80                 canvas->translate(0, 2 * kMaxR);
81                 canvas->drawPath(almostCircle, paint);
82             canvas->restore();
83         } else {
84             bool benchMode = this->getMode() == kBench_Mode;
85             canvas->save();
86             constexpr SkScalar kPad = 5;
87             constexpr SkScalar kRadiusSteps = 5;
88             constexpr SkScalar kBlurRadiusSteps = 5;
89             canvas->translate(kPad + kMinRadius + kMaxBlurRadius,
90                               kPad + kMinRadius + kMaxBlurRadius);
91             constexpr SkScalar kDeltaRadius = (kMaxRadius - kMinRadius) / kRadiusSteps;
92             constexpr SkScalar kDeltaBlurRadius = (kMaxBlurRadius - kMinBlurRadius) /
93                                                          kBlurRadiusSteps;
94             SkScalar lineWidth = 0;
95             if (!benchMode) {
96                 for (int r = 0; r < kRadiusSteps - 1; ++r) {
97                     const SkScalar radius = r * kDeltaRadius + kMinRadius;
98                     lineWidth += 2 * (radius + kMaxBlurRadius) + kPad;
99                 }
100             }
101             for (int br = 0; br < kBlurRadiusSteps; ++br) {
102                 SkScalar blurRadius = br * kDeltaBlurRadius + kMinBlurRadius;
103                 if (benchMode) {
104                     blurRadius += fRandom.nextSScalar1() * kDeltaBlurRadius;
105                 }
106                 const SkScalar maxRowR = blurRadius + kMaxRadius;
107                 paint.setMaskFilter(blurMaker(blurRadius));
108                 canvas->save();
109                 for (int r = 0; r < kRadiusSteps; ++r) {
110                     SkScalar radius = r * kDeltaRadius + kMinRadius;
111                     if (benchMode) {
112                         radius += fRandom.nextSScalar1() * kDeltaRadius;
113                     }
114                     SkPath almostCircle;
115                     if (!benchMode) {
116                         almostCircle = almostCircleMaker(radius);
117                     }
118                     canvas->save();
119                         canvas->drawCircle(0, 0, radius, paint);
120                         canvas->translate(0, 2 * maxRowR + kPad);
121                     if (!benchMode) {
122                         canvas->drawPath(almostCircle, paint);
123                     }
124                     canvas->restore();
125                     const SkScalar maxColR = radius + kMaxBlurRadius;
126                     canvas->translate(maxColR * 2 + kPad, 0);
127                 }
128                 canvas->restore();
129                 if (!benchMode) {
130                     SkPaint blackPaint;
131                     blackPaint.setColor(SK_ColorBLACK);
132                     const SkScalar lineY = 3 * maxRowR + 1.5f * kPad;
133                     if (br != kBlurRadiusSteps - 1) {
134                         canvas->drawLine(0, lineY, lineWidth, lineY, blackPaint);
135                     }
136                 }
137                 canvas->translate(0, maxRowR * 4 + 2 * kPad);
138             }
139             canvas->restore();
140         }
141     }
142 
onAnimate(double nanos)143     bool onAnimate(double nanos) override {
144         fAnimRadius = TimeUtils::PingPong(1e-9 * nanos, kRadiusPingPoingPeriod, kRadiusPingPoingShift, kMinRadius,
145                                      kMaxRadius);
146         fAnimBlurRadius = TimeUtils::PingPong(1e-9 * nanos, kBlurRadiusPingPoingPeriod, kBlurRadiusPingPoingShift,
147                                          kMinBlurRadius, kMaxBlurRadius);
148         return true;
149     }
150 
151 private:
152     static constexpr SkScalar kMinRadius = 15;
153     static constexpr SkScalar kMaxRadius = 45;
154     static constexpr SkScalar kRadiusPingPoingPeriod = 8;
155     static constexpr SkScalar kRadiusPingPoingShift = 3;
156 
157     static constexpr SkScalar kMinBlurRadius = 5;
158     static constexpr SkScalar kMaxBlurRadius = 45;
159     static constexpr SkScalar kBlurRadiusPingPoingPeriod = 3;
160     static constexpr SkScalar kBlurRadiusPingPoingShift = 1.5;
161 
162     SkScalar    fAnimRadius;
163     SkScalar    fAnimBlurRadius;
164 
165     SkRandom    fRandom;
166 
167     using INHERITED = skiagm::GM;
168 };
169 
170 DEF_GM(return new BlurCircles2GM();)
171