1 2 /* 3 * Copyright 2012 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #include "Benchmark.h" 10 #include "SkCanvas.h" 11 12 13 /** 14 * This bench mark tests the use case where the user writes the a canvas 15 * and then reads small chunks from it repeatedly. This can cause trouble 16 * for the GPU as readbacks are very expensive. 17 */ 18 class ReadPixBench : public Benchmark { 19 public: 20 ReadPixBench() {} 21 22 protected: 23 virtual const char* onGetName() SK_OVERRIDE { 24 return "readpix"; 25 } 26 27 virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE { 28 canvas->clear(SK_ColorBLACK); 29 30 SkISize size = canvas->getDeviceSize(); 31 32 int offX = (size.width() - kWindowSize) / kNumStepsX; 33 int offY = (size.height() - kWindowSize) / kNumStepsY; 34 35 SkPaint paint; 36 37 paint.setColor(SK_ColorBLUE); 38 39 canvas->drawCircle(SkIntToScalar(size.width()/2), 40 SkIntToScalar(size.height()/2), 41 SkIntToScalar(size.width()/2), 42 paint); 43 44 SkBitmap bitmap; 45 46 bitmap.setInfo(SkImageInfo::MakeN32Premul(kWindowSize, kWindowSize)); 47 48 for (int i = 0; i < loops; i++) { 49 for (int x = 0; x < kNumStepsX; ++x) { 50 for (int y = 0; y < kNumStepsY; ++y) { 51 canvas->readPixels(&bitmap, x * offX, y * offY); 52 } 53 } 54 } 55 } 56 57 private: 58 static const int kNumStepsX = 30; 59 static const int kNumStepsY = 30; 60 static const int kWindowSize = 5; 61 62 typedef Benchmark INHERITED; 63 }; 64 65 //////////////////////////////////////////////////////////////////////////////// 66 67 DEF_BENCH( return new ReadPixBench(); ) 68
