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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 "SkBenchmark.h"
      9 #include "SkCanvas.h"
     10 #include "SkPaint.h"
     11 #include "SkRandom.h"
     12 #include "SkBlurMaskFilter.h"
     13 #include "SkLayerDrawLooper.h"
     14 
     15 // This bench replicates a problematic use case of a draw looper used
     16 // to create an inner blurred rect
     17 class RectoriBench : public SkBenchmark {
     18 public:
     19     RectoriBench() {}
     20 
     21 protected:
     22 
     23     virtual const char* onGetName() {
     24         return "rectori";
     25     }
     26 
     27     virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
     28         SkRandom Random;
     29 
     30         for (int i = 0; i < loops; i++) {
     31             SkScalar blurSigma = Random.nextRangeScalar(1.5f, 25.0f);
     32             SkScalar size = Random.nextRangeScalar(20*blurSigma, 50*blurSigma);
     33 
     34             SkScalar x = Random.nextRangeScalar(0.0f, W - size);
     35             SkScalar y = Random.nextRangeScalar(0.0f, H - size);
     36 
     37             SkRect inner = { x, y, x + size, y + size };
     38 
     39             SkRect outer(inner);
     40             // outer is always outset either 2x or 4x the blur radius (we go with 2x)
     41             outer.outset(2*blurSigma, 2*blurSigma);
     42 
     43             SkPath p;
     44 
     45             p.addRect(outer);
     46             p.addRect(inner);
     47             p.setFillType(SkPath::kEvenOdd_FillType);
     48 
     49             // This will be used to translate the normal draw outside the
     50             // clip rect and translate the blurred version back inside
     51             SkScalar translate = 2.0f * size;
     52 
     53             SkPaint paint;
     54             paint.setLooper(this->createLooper(-translate, blurSigma))->unref();
     55             paint.setColor(0xff000000 | Random.nextU());
     56             paint.setAntiAlias(true);
     57 
     58             canvas->save();
     59             // clip always equals inner rect so we get the inside blur
     60             canvas->clipRect(inner);
     61             canvas->translate(translate, 0);
     62             canvas->drawPath(p, paint);
     63             canvas->restore();
     64         }
     65     }
     66 
     67 private:
     68     enum {
     69         W = 640,
     70         H = 480,
     71     };
     72 
     73     SkLayerDrawLooper* createLooper(SkScalar xOff, SkScalar sigma) {
     74         SkLayerDrawLooper* looper = new SkLayerDrawLooper;
     75 
     76         //-----------------------------------------------
     77         SkLayerDrawLooper::LayerInfo info;
     78 
     79         info.fFlagsMask = 0;
     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 = looper->addLayer(info);
     88 
     89         SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
     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 = looper->addLayer(info);
     99         return looper;
    100     }
    101 
    102     typedef SkBenchmark INHERITED;
    103 };
    104 
    105 DEF_BENCH( return SkNEW_ARGS(RectoriBench, ()); )
    106