Home | History | Annotate | Download | only in bench 
      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 "Benchmark.h"
      9 
     10 #include "SkCanvas.h"
     11 #include "SkShader.h"
     12 #include "SkGradientShader.h"
     13 #include "SkString.h"
     14 #include "SkColor.h"
     15 #include "SkPaint.h"
     16 
     17 class HardStopGradientBench_ScaleNumHardStops : public Benchmark {
     18 public:
     19     HardStopGradientBench_ScaleNumHardStops(int colorCount, int hardStopCount) {
     20         SkASSERT(hardStopCount <= colorCount/2);
     21 
     22         fName.printf("hardstop_scale_num_hard_stops_%03d_colors_%03d_hard_stops",
     23                      colorCount, hardStopCount);
     24 
     25         fColorCount    = colorCount;
     26         fHardStopCount = hardStopCount;
     27     }
     28 
     29     const char* onGetName() override {
     30         return fName.c_str();
     31     }
     32 
     33     SkIPoint onGetSize() override {
     34         return SkIPoint::Make(kSize, kSize);
     35     }
     36 
     37     void onPreDraw(SkCanvas* canvas) override {
     38         // Left to right
     39         SkPoint points[2] = {
     40             SkPoint::Make(0,        kSize/2),
     41             SkPoint::Make(kSize-1,  kSize/2),
     42         };
     43 
     44         constexpr int kNumColorChoices = 4;
     45         SkColor color_choices[kNumColorChoices] = {
     46             SK_ColorRED,
     47             SK_ColorGREEN,
     48             SK_ColorBLUE,
     49             SK_ColorYELLOW,
     50         };
     51 
     52         // Alternate between different choices
     53         SkAutoTArray<SkColor> colors(fColorCount);
     54         for (int i = 0; i < fColorCount; i++) {
     55             colors[i] = color_choices[i % kNumColorChoices];
     56         }
     57 
     58         // Create requisite number of hard stops, and evenly
     59         // space positions after that
     60         SkAutoTArray<SkScalar> positions(fColorCount);
     61         int k = 0;
     62         for (int i = 0; i < fHardStopCount; i++) {
     63             float val = k/2.0f;
     64             positions[k++] = val / fColorCount;
     65             positions[k++] = val / fColorCount;
     66         }
     67         for (int i = k; i < fColorCount; i++) {
     68             positions[i] = i / (fColorCount - 1.0f);
     69         }
     70 
     71         fPaint.setShader(SkGradientShader::MakeLinear(points,
     72                                                       colors.get(),
     73                                                       positions.get(),
     74                                                       fColorCount,
     75                                                       SkShader::kClamp_TileMode,
     76                                                       0,
     77                                                       nullptr));
     78     }
     79 
     80     /*
     81      * Draw simple linear gradient from left to right
     82      */
     83     void onDraw(int loops, SkCanvas* canvas) override {
     84         for (int i = 0; i < loops; i++) {
     85             canvas->drawPaint(fPaint);
     86         }
     87     }
     88 
     89 private:
     90     static const int kSize = 500;
     91 
     92     SkString fName;
     93     int      fColorCount;
     94     int      fHardStopCount;
     95     SkPaint  fPaint;
     96 
     97     typedef Benchmark INHERITED;
     98 };
     99 
    100 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(10, 1);)
    101 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(10, 2);)
    102 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(10, 5);)
    103 
    104 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(20,  1);)
    105 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(20,  5);)
    106 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(20, 10);)
    107 
    108 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(50,  1);)
    109 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(50, 10);)
    110 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(50, 25);)
    111 
    112 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(100,  1);)
    113 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(100, 25);)
    114 DEF_BENCH(return new HardStopGradientBench_ScaleNumHardStops(100, 50);)
    115