1 /* 2 * Copyright 2012 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 // This test is specific to the GPU backend. 9 #if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID) 10 11 #include "GrContextFactory.h" 12 #include "SkGpuDevice.h" 13 #include "Test.h" 14 15 static const int X_SIZE = 12; 16 static const int Y_SIZE = 12; 17 18 DEF_GPUTEST(ReadWriteAlpha, reporter, factory) { 19 for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) { 20 GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type); 21 if (!GrContextFactory::IsRenderingGLContext(glType)) { 22 continue; 23 } 24 GrContext* context = factory->get(glType); 25 if (NULL == context) { 26 continue; 27 } 28 29 unsigned char textureData[X_SIZE][Y_SIZE]; 30 31 memset(textureData, 0, X_SIZE * Y_SIZE); 32 33 GrTextureDesc desc; 34 35 // let Skia know we will be using this texture as a render target 36 desc.fFlags = kRenderTarget_GrTextureFlagBit; 37 // it is a single channel texture 38 desc.fConfig = kAlpha_8_GrPixelConfig; 39 desc.fWidth = X_SIZE; 40 desc.fHeight = Y_SIZE; 41 42 // We are initializing the texture with zeros here 43 GrTexture* texture = context->createUncachedTexture(desc, textureData, 0); 44 if (!texture) { 45 return; 46 } 47 48 SkAutoUnref au(texture); 49 50 // create a distinctive texture 51 for (int y = 0; y < Y_SIZE; ++y) { 52 for (int x = 0; x < X_SIZE; ++x) { 53 textureData[x][y] = x*Y_SIZE+y; 54 } 55 } 56 57 // upload the texture 58 texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, 59 textureData, 0); 60 61 unsigned char readback[X_SIZE][Y_SIZE]; 62 63 // clear readback to something non-zero so we can detect readback failures 64 memset(readback, 0x1, X_SIZE * Y_SIZE); 65 66 // read the texture back 67 texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, 68 readback, 0); 69 70 // make sure the original & read back versions match 71 bool match = true; 72 73 for (int y = 0; y < Y_SIZE; ++y) { 74 for (int x = 0; x < X_SIZE; ++x) { 75 if (textureData[x][y] != readback[x][y]) { 76 match = false; 77 } 78 } 79 } 80 81 REPORTER_ASSERT(reporter, match); 82 83 // Now try writing on the single channel texture 84 SkAutoTUnref<SkBaseDevice> device(new SkGpuDevice(context, texture->asRenderTarget())); 85 SkCanvas canvas(device); 86 87 SkPaint paint; 88 89 const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10); 90 91 paint.setColor(SK_ColorWHITE); 92 93 canvas.drawRect(rect, paint); 94 95 texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, 96 readback, 0); 97 98 match = true; 99 100 for (int y = 0; y < Y_SIZE; ++y) { 101 for (int x = 0; x < X_SIZE; ++x) { 102 if (0xFF != readback[x][y]) { 103 match = false; 104 } 105 } 106 } 107 108 REPORTER_ASSERT(reporter, match); 109 } 110 } 111 112 #endif 113
