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 "SkBenchmark.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 SkBenchmark { 19 public: 20 ReadPixBench(void* param) : INHERITED(param) {} 21 22 protected: 23 virtual const char* onGetName() SK_OVERRIDE { 24 return "readpix"; 25 } 26 27 virtual void onDraw(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.setConfig(SkBitmap::kARGB_8888_Config, kWindowSize, kWindowSize); 47 48 for (int x = 0; x < kNumStepsX; ++x) { 49 for (int y = 0; y < kNumStepsY; ++y) { 50 canvas->readPixels(&bitmap, x * offX, y * offY); 51 } 52 } 53 } 54 55 private: 56 static const int kNumStepsX = 30; 57 static const int kNumStepsY = 30; 58 static const int kWindowSize = 5; 59 60 typedef SkBenchmark INHERITED; 61 }; 62 63 //////////////////////////////////////////////////////////////////////////////// 64 65 static SkBenchmark* fact(void* p) { return new ReadPixBench(p); } 66 static BenchRegistry gReg(fact); 67
