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 */
28class BlurCircles2GM : public skiagm::GM {
29public:
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
38protected:
39    bool runAsBench() const override { return true; }
40
41    SkString onShortName() override { return SkString("blurcircles2"); }
42
43    SkISize onISize() override {
44        return SkISize::Make(730, 1350);
45    }
46
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 SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
59                                          SkBlurMask::ConvertRadiusToSigma(radius),
60                                          SkBlurMaskFilter::kHighQuality_BlurFlag);
61        };
62
63        SkPaint paint;
64        paint.setColor(SK_ColorBLACK);
65
66        if (this->getMode() == kSample_Mode) {
67            paint.setMaskFilter(blurMaker(fAnimBlurRadius));
68            SkISize size = canvas->getBaseLayerSize();
69            SkPath almostCircle;
70            almostCircleMaker(fAnimRadius, &almostCircle);
71            canvas->save();
72                canvas->translate(size.fWidth / 2.f, size.fHeight / 4.f);
73                canvas->drawCircle(0, 0, fAnimRadius, paint);
74                canvas->translate(0, 2 * kMaxR);
75                canvas->drawPath(almostCircle, paint);
76            canvas->restore();
77        } else {
78            bool benchMode = this->getMode() == kBench_Mode;
79            canvas->save();
80            constexpr SkScalar kPad = 5;
81            constexpr SkScalar kRadiusSteps = 5;
82            constexpr SkScalar kBlurRadiusSteps = 5;
83            canvas->translate(kPad + kMinRadius + kMaxBlurRadius,
84                              kPad + kMinRadius + kMaxBlurRadius);
85            constexpr SkScalar kDeltaRadius = (kMaxRadius - kMinRadius) / kRadiusSteps;
86            constexpr SkScalar kDeltaBlurRadius = (kMaxBlurRadius - kMinBlurRadius) /
87                                                         kBlurRadiusSteps;
88            SkScalar lineWidth = 0;
89            if (!benchMode) {
90                for (int r = 0; r < kRadiusSteps - 1; ++r) {
91                    const SkScalar radius = r * kDeltaRadius + kMinRadius;
92                    lineWidth += 2 * (radius + kMaxBlurRadius) + kPad;
93                }
94            }
95            for (int br = 0; br < kBlurRadiusSteps; ++br) {
96                SkScalar blurRadius = br * kDeltaBlurRadius + kMinBlurRadius;
97                if (benchMode) {
98                    blurRadius += fRandom.nextSScalar1() * kDeltaBlurRadius;
99                }
100                const SkScalar maxRowR = blurRadius + kMaxRadius;
101                paint.setMaskFilter(blurMaker(blurRadius));
102                canvas->save();
103                for (int r = 0; r < kRadiusSteps; ++r) {
104                    SkScalar radius = r * kDeltaRadius + kMinRadius;
105                    if (benchMode) {
106                        radius += fRandom.nextSScalar1() * kDeltaRadius;
107                    }
108                    SkPath almostCircle;
109                    if (!benchMode) {
110                        almostCircleMaker(radius, &almostCircle);
111                    }
112                    canvas->save();
113                        canvas->drawCircle(0, 0, radius, paint);
114                        canvas->translate(0, 2 * maxRowR + kPad);
115                    if (!benchMode) {
116                        canvas->drawPath(almostCircle, paint);
117                    }
118                    canvas->restore();
119                    const SkScalar maxColR = radius + kMaxBlurRadius;
120                    canvas->translate(maxColR * 2 + kPad, 0);
121                }
122                canvas->restore();
123                if (!benchMode) {
124                    SkPaint blackPaint;
125                    blackPaint.setColor(SK_ColorBLACK);
126                    const SkScalar lineY = 3 * maxRowR + 1.5f * kPad;
127                    if (br != kBlurRadiusSteps - 1) {
128                        canvas->drawLine(0, lineY, lineWidth, lineY, blackPaint);
129                    }
130                }
131                canvas->translate(0, maxRowR * 4 + 2 * kPad);
132            }
133            canvas->restore();
134        }
135    }
136
137    bool onAnimate(const SkAnimTimer& timer) override {
138        fAnimRadius = timer.pingPong(kRadiusPingPoingPeriod, kRadiusPingPoingShift, kMinRadius,
139                                     kMaxRadius);
140        fAnimBlurRadius = timer.pingPong(kBlurRadiusPingPoingPeriod, kBlurRadiusPingPoingShift,
141                                         kMinBlurRadius, kMaxBlurRadius);
142        return true;
143    }
144
145private:
146    static constexpr SkScalar kMinRadius = 15;
147    static constexpr SkScalar kMaxRadius = 45;
148    static constexpr SkScalar kRadiusPingPoingPeriod = 8;
149    static constexpr SkScalar kRadiusPingPoingShift = 3;
150
151    static constexpr SkScalar kMinBlurRadius = 5;
152    static constexpr SkScalar kMaxBlurRadius = 45;
153    static constexpr SkScalar kBlurRadiusPingPoingPeriod = 3;
154    static constexpr SkScalar kBlurRadiusPingPoingShift = 1.5;
155
156    SkScalar    fAnimRadius;
157    SkScalar    fAnimBlurRadius;
158
159    SkRandom    fRandom;
160
161    typedef skiagm::GM INHERITED;
162};
163
164DEF_GM(return new BlurCircles2GM();)
165