1 /* 2 * Copyright 2012 The Android Open Source Project 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 "SkBitmap.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: ReadPixBench()20 ReadPixBench() {} 21 22 protected: onGetName()23 const char* onGetName() override { 24 return "readpix"; 25 } 26 onDraw(int loops,SkCanvas * canvas)27 void onDraw(int loops, SkCanvas* canvas) override { 28 canvas->clear(SK_ColorBLACK); 29 30 SkISize size = canvas->getBaseLayerSize(); 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.allocPixels(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.info(), bitmap.getPixels(), bitmap.rowBytes(), 52 x * offX, y * offY); 53 } 54 } 55 } 56 } 57 58 private: 59 static const int kNumStepsX = 30; 60 static const int kNumStepsY = 30; 61 static const int kWindowSize = 5; 62 63 typedef Benchmark INHERITED; 64 }; 65 66 //////////////////////////////////////////////////////////////////////////////// 67 68 DEF_BENCH( return new ReadPixBench(); ) 69