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      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:
     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:
     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 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 
    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