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.h"
9 #include "SkAnimTimer.h"
10 #include "SkBlurMask.h"
11 #include "SkBlurMaskFilter.h"
12 #include "SkCanvas.h"
13 #include "SkPaint.h"
14 #include "SkPath.h"
15 #include "SkString.h"
16 #include "SkRandom.h"
17 
18 /**
19  * In GM mode this draws an array of circles with different radii and different blur radii. Below
20  * each circle an almost-circle path is drawn with the same blur filter for comparison.
21  *
22  * In Sample mode this draws a single circle and almost-circle with animating radius and blur
23  * radius.
24  *
25  * Bench mode draws the same as GM mode but without the comparison almost-circle paths. It also
26  * slightly perturbs the blur and circle radii to stress caching of blurred profiles in GPU mode.
27  */
28 class BlurCircles2GM : public skiagm::GM {
29 public:
BlurCircles2GM()30     BlurCircles2GM() {
31         fAnimRadius = SkAnimTimer::PingPong(0, kRadiusPingPoingPeriod, kRadiusPingPoingShift,
32                                             kMinRadius, kMaxRadius);
33         fAnimBlurRadius = SkAnimTimer::PingPong(0, kBlurRadiusPingPoingPeriod,
34                                                 kBlurRadiusPingPoingShift, kMinBlurRadius,
35                                                 kMaxBlurRadius);
36     }
37 
38 protected:
runAsBench() const39     bool runAsBench() const override { return true; }
40 
onShortName()41     SkString onShortName() override { return SkString("blurcircles2"); }
42 
onISize()43     SkISize onISize() override {
44         return SkISize::Make(730, 1350);
45     }
46 
onDraw(SkCanvas * canvas)47     void onDraw(SkCanvas* canvas) override {
48         constexpr SkScalar kMaxR = kMaxRadius + kMaxBlurRadius;
49 
50         auto almostCircleMaker = [] (SkScalar radius, SkPath* dst) {
51             dst->reset();
52             dst->addArc(SkRect::MakeXYWH(-radius, -radius, 2 * radius, 2 * radius), 0, 355);
53             dst->setIsVolatile(true);
54             dst->close();
55         };
56 
57         auto blurMaker = [] (SkScalar radius) ->sk_sp<SkMaskFilter> {
58             return SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
59                                           SkBlurMask::ConvertRadiusToSigma(radius));
60         };
61 
62         SkPaint paint;
63         paint.setColor(SK_ColorBLACK);
64 
65         if (this->getMode() == kSample_Mode) {
66             paint.setMaskFilter(blurMaker(fAnimBlurRadius));
67             SkISize size = canvas->getBaseLayerSize();
68             SkPath almostCircle;
69             almostCircleMaker(fAnimRadius, &almostCircle);
70             canvas->save();
71                 canvas->translate(size.fWidth / 2.f, size.fHeight / 4.f);
72                 canvas->drawCircle(0, 0, fAnimRadius, paint);
73                 canvas->translate(0, 2 * kMaxR);
74                 canvas->drawPath(almostCircle, paint);
75             canvas->restore();
76         } else {
77             bool benchMode = this->getMode() == kBench_Mode;
78             canvas->save();
79             constexpr SkScalar kPad = 5;
80             constexpr SkScalar kRadiusSteps = 5;
81             constexpr SkScalar kBlurRadiusSteps = 5;
82             canvas->translate(kPad + kMinRadius + kMaxBlurRadius,
83                               kPad + kMinRadius + kMaxBlurRadius);
84             constexpr SkScalar kDeltaRadius = (kMaxRadius - kMinRadius) / kRadiusSteps;
85             constexpr SkScalar kDeltaBlurRadius = (kMaxBlurRadius - kMinBlurRadius) /
86                                                          kBlurRadiusSteps;
87             SkScalar lineWidth = 0;
88             if (!benchMode) {
89                 for (int r = 0; r < kRadiusSteps - 1; ++r) {
90                     const SkScalar radius = r * kDeltaRadius + kMinRadius;
91                     lineWidth += 2 * (radius + kMaxBlurRadius) + kPad;
92                 }
93             }
94             for (int br = 0; br < kBlurRadiusSteps; ++br) {
95                 SkScalar blurRadius = br * kDeltaBlurRadius + kMinBlurRadius;
96                 if (benchMode) {
97                     blurRadius += fRandom.nextSScalar1() * kDeltaBlurRadius;
98                 }
99                 const SkScalar maxRowR = blurRadius + kMaxRadius;
100                 paint.setMaskFilter(blurMaker(blurRadius));
101                 canvas->save();
102                 for (int r = 0; r < kRadiusSteps; ++r) {
103                     SkScalar radius = r * kDeltaRadius + kMinRadius;
104                     if (benchMode) {
105                         radius += fRandom.nextSScalar1() * kDeltaRadius;
106                     }
107                     SkPath almostCircle;
108                     if (!benchMode) {
109                         almostCircleMaker(radius, &almostCircle);
110                     }
111                     canvas->save();
112                         canvas->drawCircle(0, 0, radius, paint);
113                         canvas->translate(0, 2 * maxRowR + kPad);
114                     if (!benchMode) {
115                         canvas->drawPath(almostCircle, paint);
116                     }
117                     canvas->restore();
118                     const SkScalar maxColR = radius + kMaxBlurRadius;
119                     canvas->translate(maxColR * 2 + kPad, 0);
120                 }
121                 canvas->restore();
122                 if (!benchMode) {
123                     SkPaint blackPaint;
124                     blackPaint.setColor(SK_ColorBLACK);
125                     const SkScalar lineY = 3 * maxRowR + 1.5f * kPad;
126                     if (br != kBlurRadiusSteps - 1) {
127                         canvas->drawLine(0, lineY, lineWidth, lineY, blackPaint);
128                     }
129                 }
130                 canvas->translate(0, maxRowR * 4 + 2 * kPad);
131             }
132             canvas->restore();
133         }
134     }
135 
onAnimate(const SkAnimTimer & timer)136     bool onAnimate(const SkAnimTimer& timer) override {
137         fAnimRadius = timer.pingPong(kRadiusPingPoingPeriod, kRadiusPingPoingShift, kMinRadius,
138                                      kMaxRadius);
139         fAnimBlurRadius = timer.pingPong(kBlurRadiusPingPoingPeriod, kBlurRadiusPingPoingShift,
140                                          kMinBlurRadius, kMaxBlurRadius);
141         return true;
142     }
143 
144 private:
145     static constexpr SkScalar kMinRadius = 15;
146     static constexpr SkScalar kMaxRadius = 45;
147     static constexpr SkScalar kRadiusPingPoingPeriod = 8;
148     static constexpr SkScalar kRadiusPingPoingShift = 3;
149 
150     static constexpr SkScalar kMinBlurRadius = 5;
151     static constexpr SkScalar kMaxBlurRadius = 45;
152     static constexpr SkScalar kBlurRadiusPingPoingPeriod = 3;
153     static constexpr SkScalar kBlurRadiusPingPoingShift = 1.5;
154 
155     SkScalar    fAnimRadius;
156     SkScalar    fAnimBlurRadius;
157 
158     SkRandom    fRandom;
159 
160     typedef skiagm::GM INHERITED;
161 };
162 
163 DEF_GM(return new BlurCircles2GM();)
164