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      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));
     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     sk_sp<SkDrawLooper> 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 = SkBlendMode::kDst;
     84         info.fOffset.set(xOff, 0);
     85         info.fPostTranslate = false;
     86 
     87         SkPaint* paint = looperBuilder.addLayer(info);
     88 
     89         paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, sigma,
     90                                                     SkBlurMaskFilter::kHighQuality_BlurFlag));
     91 
     92         //-----------------------------------------------
     93         info.fPaintBits = 0;
     94         info.fOffset.set(0, 0);
     95 
     96         paint = looperBuilder.addLayer(info);
     97         return looperBuilder.detach();
     98     }
     99 
    100     typedef Benchmark INHERITED;
    101 };
    102 
    103 DEF_BENCH(return new RectoriBench();)
    104