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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 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 
    145 private:
    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 
    164 DEF_GM(return new BlurCircles2GM();)
    165