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 #include "Test.h" 9 10 // This test is specific to the GPU backend. 11 #if SK_SUPPORT_GPU 12 13 #include "GrContext.h" 14 #include "GrContextPriv.h" 15 #include "GrResourceProvider.h" 16 #include "GrSurfaceContext.h" 17 #include "GrSurfaceProxy.h" 18 #include "SkCanvas.h" 19 #include "SkSurface.h" 20 21 // This was made indivisible by 4 to ensure we test setting GL_PACK_ALIGNMENT properly. 22 static const int X_SIZE = 13; 23 static const int Y_SIZE = 13; 24 25 static void validate_alpha_data(skiatest::Reporter* reporter, int w, int h, const uint8_t* actual, 26 size_t actualRowBytes, const uint8_t* expected, SkString extraMsg) { 27 for (int y = 0; y < h; ++y) { 28 for (int x = 0; x < w; ++x) { 29 uint8_t a = actual[y * actualRowBytes + x]; 30 uint8_t e = expected[y * w + x]; 31 if (e != a) { 32 ERRORF(reporter, 33 "Failed alpha readback. Expected: 0x%02x, Got: 0x%02x at (%d,%d), %s", 34 e, a, x, y, extraMsg.c_str()); 35 return; 36 } 37 } 38 } 39 } 40 41 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadWriteAlpha, reporter, ctxInfo) { 42 GrContext* context = ctxInfo.grContext(); 43 unsigned char alphaData[X_SIZE * Y_SIZE]; 44 45 static const int kClearValue = 0x2; 46 47 bool match; 48 static const size_t kRowBytes[] = {0, X_SIZE, X_SIZE + 1, 2 * X_SIZE - 1}; 49 { 50 GrSurfaceDesc desc; 51 desc.fFlags = kNone_GrSurfaceFlags; 52 desc.fConfig = kAlpha_8_GrPixelConfig; // it is a single channel texture 53 desc.fWidth = X_SIZE; 54 desc.fHeight = Y_SIZE; 55 56 // We are initializing the texture with zeros here 57 memset(alphaData, 0, X_SIZE * Y_SIZE); 58 59 sk_sp<GrTextureProxy> proxy(GrSurfaceProxy::MakeDeferred(context->resourceProvider(), 60 desc, 61 SkBudgeted::kNo, 62 alphaData, 0)); 63 if (!proxy) { 64 ERRORF(reporter, "Could not create alpha texture."); 65 return; 66 } 67 sk_sp<GrSurfaceContext> sContext(context->contextPriv().makeWrappedSurfaceContext( 68 std::move(proxy), nullptr)); 69 70 const SkImageInfo ii = SkImageInfo::MakeA8(X_SIZE, Y_SIZE); 71 sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii)); 72 73 // create a distinctive texture 74 for (int y = 0; y < Y_SIZE; ++y) { 75 for (int x = 0; x < X_SIZE; ++x) { 76 alphaData[y * X_SIZE + x] = y*X_SIZE+x; 77 } 78 } 79 80 for (auto rowBytes : kRowBytes) { 81 82 // upload the texture (do per-rowbytes iteration because we may overwrite below). 83 bool result = sContext->writePixels(ii, alphaData, 0, 0, 0); 84 REPORTER_ASSERT_MESSAGE(reporter, result, "Initial A8 writePixels failed"); 85 86 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE; 87 std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]); 88 // clear readback to something non-zero so we can detect readback failures 89 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE); 90 91 // read the texture back 92 result = sContext->readPixels(ii, readback.get(), rowBytes, 0, 0); 93 REPORTER_ASSERT_MESSAGE(reporter, result, "Initial A8 readPixels failed"); 94 95 // make sure the original & read back versions match 96 SkString msg; 97 msg.printf("rb:%d A8", SkToU32(rowBytes)); 98 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes, 99 alphaData, msg); 100 101 // Now try writing to a single channel surface (if we could create one). 102 if (surf) { 103 SkCanvas* canvas = surf->getCanvas(); 104 105 SkPaint paint; 106 107 const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10); 108 109 paint.setColor(SK_ColorWHITE); 110 111 canvas->drawRect(rect, paint); 112 113 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE); 114 result = surf->readPixels(ii, readback.get(), nonZeroRowBytes, 0, 0); 115 REPORTER_ASSERT_MESSAGE(reporter, result, "A8 readPixels after clear failed"); 116 117 match = true; 118 for (int y = 0; y < Y_SIZE && match; ++y) { 119 for (int x = 0; x < X_SIZE && match; ++x) { 120 uint8_t rbValue = readback.get()[y * nonZeroRowBytes + x]; 121 if (0xFF != rbValue) { 122 ERRORF(reporter, 123 "Failed alpha readback after clear. Expected: 0xFF, Got: 0x%02x" 124 " at (%d,%d), rb:%d", rbValue, x, y, SkToU32(rowBytes)); 125 match = false; 126 } 127 } 128 } 129 } 130 } 131 } 132 133 static const GrPixelConfig kRGBAConfigs[] { 134 kRGBA_8888_GrPixelConfig, 135 kBGRA_8888_GrPixelConfig, 136 kSRGBA_8888_GrPixelConfig 137 }; 138 139 for (int y = 0; y < Y_SIZE; ++y) { 140 for (int x = 0; x < X_SIZE; ++x) { 141 alphaData[y * X_SIZE + x] = y*X_SIZE+x; 142 } 143 } 144 145 // Attempt to read back just alpha from a RGBA/BGRA texture. Once with a texture-only src and 146 // once with a render target. 147 for (auto cfg : kRGBAConfigs) { 148 for (int rt = 0; rt < 2; ++rt) { 149 GrSurfaceDesc desc; 150 desc.fFlags = rt ? kRenderTarget_GrSurfaceFlag : kNone_GrSurfaceFlags; 151 desc.fConfig = cfg; 152 desc.fWidth = X_SIZE; 153 desc.fHeight = Y_SIZE; 154 155 uint32_t rgbaData[X_SIZE * Y_SIZE]; 156 // Make the alpha channel of the rgba texture come from alphaData. 157 for (int y = 0; y < Y_SIZE; ++y) { 158 for (int x = 0; x < X_SIZE; ++x) { 159 rgbaData[y * X_SIZE + x] = GrColorPackRGBA(6, 7, 8, alphaData[y * X_SIZE + x]); 160 } 161 } 162 sk_sp<GrTexture> texture( 163 context->resourceProvider()->createTexture(desc, SkBudgeted::kNo, rgbaData, 0)); 164 if (!texture) { 165 // We always expect to be able to create a RGBA texture 166 if (!rt && kRGBA_8888_GrPixelConfig == desc.fConfig) { 167 ERRORF(reporter, "Failed to create RGBA texture."); 168 } 169 continue; 170 } 171 172 for (auto rowBytes : kRowBytes) { 173 size_t nonZeroRowBytes = rowBytes ? rowBytes : X_SIZE; 174 175 std::unique_ptr<uint8_t[]> readback(new uint8_t[nonZeroRowBytes * Y_SIZE]); 176 // Clear so we don't accidentally see values from previous iteration. 177 memset(readback.get(), kClearValue, nonZeroRowBytes * Y_SIZE); 178 179 // read the texture back 180 bool result = texture->readPixels(0, 0, desc.fWidth, desc.fHeight, 181 kAlpha_8_GrPixelConfig, 182 readback.get(), rowBytes); 183 REPORTER_ASSERT_MESSAGE(reporter, result, "8888 readPixels failed"); 184 185 // make sure the original & read back versions match 186 SkString msg; 187 msg.printf("rt:%d, rb:%d 8888", rt, SkToU32(rowBytes)); 188 validate_alpha_data(reporter, X_SIZE, Y_SIZE, readback.get(), nonZeroRowBytes, 189 alphaData, msg); 190 } 191 } 192 } 193 } 194 195 #endif 196
