bench/RectoriBench.cpp

   1 /*
   2  * Copyright 2013 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 "Benchmark.h"
   9 #include "SkBlurMaskFilter.h"
  10 #include "SkCanvas.h"
  11 #include "SkLayerDrawLooper.h"
  12 #include "SkPaint.h"
  13 #include "SkPath.h"
  14 #include "SkRandom.h"
  15
  16 // This bench replicates a problematic use case of a draw looper used
  17 // to create an inner blurred rect
  18 class RectoriBench : public Benchmark {
  19 public:
  20     RectoriBench() {}
  21
  22 protected:
  23
  24     const char* onGetName() override {
  25         return "rectori";
  26     }
  27
  28     void onDraw(int loops, SkCanvas* canvas) override {
  29         SkRandom Random;
  30
  31         for (int i = 0; i < loops; i++) {
  32             SkScalar blurSigma = Random.nextRangeScalar(1.5f, 25.0f);
  33             SkScalar size = Random.nextRangeScalar(20*blurSigma, 50*blurSigma);
  34
  35             SkScalar x = Random.nextRangeScalar(0.0f, W - size);
  36             SkScalar y = Random.nextRangeScalar(0.0f, H - size);
  37
  38             SkRect inner = { x, y, x + size, y + size };
  39
  40             SkRect outer(inner);
  41             // outer is always outset either 2x or 4x the blur radius (we go with 2x)
  42             outer.outset(2*blurSigma, 2*blurSigma);
  43
  44             SkPath p;
  45
  46             p.addRect(outer);
  47             p.addRect(inner);
  48             p.setFillType(SkPath::kEvenOdd_FillType);
  49
  50             // This will be used to translate the normal draw outside the
  51             // clip rect and translate the blurred version back inside
  52             SkScalar translate = 2.0f * size;
  53
  54             SkPaint paint;
  55             paint.setLooper(this->createLooper(-translate, blurSigma))->unref();
  56             paint.setColor(0xff000000 | Random.nextU());
  57             paint.setAntiAlias(true);
  58
  59             canvas->save();
  60             // clip always equals inner rect so we get the inside blur
  61             canvas->clipRect(inner);
  62             canvas->translate(translate, 0);
  63             canvas->drawPath(p, paint);
  64             canvas->restore();
  65         }
  66     }
  67
  68 private:
  69     enum {
  70         W = 640,
  71         H = 480,
  72     };
  73
  74     SkLayerDrawLooper* createLooper(SkScalar xOff, SkScalar sigma) {
  75         SkLayerDrawLooper::Builder looperBuilder;
  76
  77         //-----------------------------------------------
  78         SkLayerDrawLooper::LayerInfo info;
  79
  80         // TODO: add a color filter to better match what is seen in the wild
  81         info.fPaintBits = /* SkLayerDrawLooper::kColorFilter_Bit |*/
  82                           SkLayerDrawLooper::kMaskFilter_Bit;
  83         info.fColorMode = SkXfermode::kDst_Mode;
  84         info.fOffset.set(xOff, 0);
  85         info.fPostTranslate = false;
  86
  87         SkPaint* paint = looperBuilder.addLayer(info);
  88
  89         SkMaskFilter* mf = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
  90                                                     sigma,
  91                                                     SkBlurMaskFilter::kHighQuality_BlurFlag);
  92         paint->setMaskFilter(mf)->unref();
  93
  94         //-----------------------------------------------
  95         info.fPaintBits = 0;
  96         info.fOffset.set(0, 0);
  97
  98         paint = looperBuilder.addLayer(info);
  99         return looperBuilder.detachLooper();
 100     }
 101
 102     typedef Benchmark INHERITED;
 103 };
 104
 105 DEF_BENCH(return new RectoriBench();)