1 /* 2 * Copyright 2011 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 "SkBitmapDevice.h" 9 #include "SkCanvas.h" 10 #include "SkColorPriv.h" 11 #include "SkMathPriv.h" 12 #include "SkRegion.h" 13 #include "Test.h" 14 15 #if SK_SUPPORT_GPU 16 #include "GrContextFactory.h" 17 #include "SkGpuDevice.h" 18 #endif 19 20 static const int DEV_W = 100, DEV_H = 100; 21 static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H); 22 static const SkRect DEV_RECT_S = SkRect::MakeWH(DEV_W * SK_Scalar1, 23 DEV_H * SK_Scalar1); 24 25 static SkPMColor getCanvasColor(int x, int y) { 26 SkASSERT(x >= 0 && x < DEV_W); 27 SkASSERT(y >= 0 && y < DEV_H); 28 29 U8CPU r = x; 30 U8CPU g = y; 31 U8CPU b = 0xc; 32 33 U8CPU a = 0xff; 34 switch ((x+y) % 5) { 35 case 0: 36 a = 0xff; 37 break; 38 case 1: 39 a = 0x80; 40 break; 41 case 2: 42 a = 0xCC; 43 break; 44 case 4: 45 a = 0x01; 46 break; 47 case 3: 48 a = 0x00; 49 break; 50 } 51 return SkPremultiplyARGBInline(a, r, g, b); 52 } 53 54 static SkPMColor getBitmapColor(int x, int y, int w) { 55 int n = y * w + x; 56 57 U8CPU b = n & 0xff; 58 U8CPU g = (n >> 8) & 0xff; 59 U8CPU r = (n >> 16) & 0xff; 60 return SkPackARGB32(0xff, r, g , b); 61 } 62 63 static SkPMColor convertToPMColor(SkColorType ct, SkAlphaType at, const uint32_t* addr, 64 bool* doUnpremul) { 65 *doUnpremul = (kUnpremul_SkAlphaType == at); 66 67 const uint8_t* c = reinterpret_cast<const uint8_t*>(addr); 68 U8CPU a,r,g,b; 69 switch (ct) { 70 case kBGRA_8888_SkColorType: 71 b = static_cast<U8CPU>(c[0]); 72 g = static_cast<U8CPU>(c[1]); 73 r = static_cast<U8CPU>(c[2]); 74 a = static_cast<U8CPU>(c[3]); 75 break; 76 case kRGBA_8888_SkColorType: 77 r = static_cast<U8CPU>(c[0]); 78 g = static_cast<U8CPU>(c[1]); 79 b = static_cast<U8CPU>(c[2]); 80 a = static_cast<U8CPU>(c[3]); 81 break; 82 default: 83 SkDEBUGFAIL("Unexpected colortype"); 84 return 0; 85 } 86 87 if (*doUnpremul) { 88 r = SkMulDiv255Ceiling(r, a); 89 g = SkMulDiv255Ceiling(g, a); 90 b = SkMulDiv255Ceiling(b, a); 91 } 92 return SkPackARGB32(a, r, g, b); 93 } 94 95 static void fillCanvas(SkCanvas* canvas) { 96 static SkBitmap bmp; 97 if (bmp.isNull()) { 98 SkDEBUGCODE(bool alloc =) bmp.allocN32Pixels(DEV_W, DEV_H); 99 SkASSERT(alloc); 100 SkAutoLockPixels alp(bmp); 101 intptr_t pixels = reinterpret_cast<intptr_t>(bmp.getPixels()); 102 for (int y = 0; y < DEV_H; ++y) { 103 for (int x = 0; x < DEV_W; ++x) { 104 SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bmp.rowBytes() + x * bmp.bytesPerPixel()); 105 *pixel = getCanvasColor(x, y); 106 } 107 } 108 } 109 canvas->save(); 110 canvas->setMatrix(SkMatrix::I()); 111 canvas->clipRect(DEV_RECT_S, SkRegion::kReplace_Op); 112 SkPaint paint; 113 paint.setXfermodeMode(SkXfermode::kSrc_Mode); 114 canvas->drawBitmap(bmp, 0, 0, &paint); 115 canvas->restore(); 116 } 117 118 static void fillBitmap(SkBitmap* bitmap) { 119 SkASSERT(bitmap->lockPixelsAreWritable()); 120 SkAutoLockPixels alp(*bitmap); 121 int w = bitmap->width(); 122 int h = bitmap->height(); 123 intptr_t pixels = reinterpret_cast<intptr_t>(bitmap->getPixels()); 124 for (int y = 0; y < h; ++y) { 125 for (int x = 0; x < w; ++x) { 126 SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bitmap->rowBytes() + x * bitmap->bytesPerPixel()); 127 *pixel = getBitmapColor(x, y, w); 128 } 129 } 130 } 131 132 static bool checkPixel(SkPMColor a, SkPMColor b, bool didPremulConversion) { 133 if (!didPremulConversion) { 134 return a == b; 135 } 136 int32_t aA = static_cast<int32_t>(SkGetPackedA32(a)); 137 int32_t aR = static_cast<int32_t>(SkGetPackedR32(a)); 138 int32_t aG = static_cast<int32_t>(SkGetPackedG32(a)); 139 int32_t aB = SkGetPackedB32(a); 140 141 int32_t bA = static_cast<int32_t>(SkGetPackedA32(b)); 142 int32_t bR = static_cast<int32_t>(SkGetPackedR32(b)); 143 int32_t bG = static_cast<int32_t>(SkGetPackedG32(b)); 144 int32_t bB = static_cast<int32_t>(SkGetPackedB32(b)); 145 146 return aA == bA && 147 SkAbs32(aR - bR) <= 1 && 148 SkAbs32(aG - bG) <= 1 && 149 SkAbs32(aB - bB) <= 1; 150 } 151 152 // checks the bitmap contains correct pixels after the readPixels 153 // if the bitmap was prefilled with pixels it checks that these weren't 154 // overwritten in the area outside the readPixels. 155 static bool checkRead(skiatest::Reporter* reporter, 156 const SkBitmap& bitmap, 157 int x, int y, 158 bool checkCanvasPixels, 159 bool checkBitmapPixels) { 160 SkASSERT(4 == bitmap.bytesPerPixel()); 161 SkASSERT(!bitmap.isNull()); 162 SkASSERT(checkCanvasPixels || checkBitmapPixels); 163 164 const SkColorType ct = bitmap.colorType(); 165 const SkAlphaType at = bitmap.alphaType(); 166 167 int bw = bitmap.width(); 168 int bh = bitmap.height(); 169 170 SkIRect srcRect = SkIRect::MakeXYWH(x, y, bw, bh); 171 SkIRect clippedSrcRect = DEV_RECT; 172 if (!clippedSrcRect.intersect(srcRect)) { 173 clippedSrcRect.setEmpty(); 174 } 175 SkAutoLockPixels alp(bitmap); 176 for (int by = 0; by < bh; ++by) { 177 for (int bx = 0; bx < bw; ++bx) { 178 int devx = bx + srcRect.fLeft; 179 int devy = by + srcRect.fTop; 180 181 const uint32_t* pixel = bitmap.getAddr32(bx, by); 182 183 if (clippedSrcRect.contains(devx, devy)) { 184 if (checkCanvasPixels) { 185 SkPMColor canvasPixel = getCanvasColor(devx, devy); 186 bool didPremul; 187 SkPMColor pmPixel = convertToPMColor(ct, at, pixel, &didPremul); 188 bool check; 189 REPORTER_ASSERT(reporter, check = checkPixel(pmPixel, canvasPixel, didPremul)); 190 if (!check) { 191 return false; 192 } 193 } 194 } else if (checkBitmapPixels) { 195 REPORTER_ASSERT(reporter, getBitmapColor(bx, by, bw) == *pixel); 196 if (getBitmapColor(bx, by, bw) != *pixel) { 197 return false; 198 } 199 } 200 } 201 } 202 return true; 203 } 204 205 enum BitmapInit { 206 kFirstBitmapInit = 0, 207 208 kNoPixels_BitmapInit = kFirstBitmapInit, 209 kTight_BitmapInit, 210 kRowBytes_BitmapInit, 211 212 kBitmapInitCnt 213 }; 214 215 static BitmapInit nextBMI(BitmapInit bmi) { 216 int x = bmi; 217 return static_cast<BitmapInit>(++x); 218 } 219 220 static void init_bitmap(SkBitmap* bitmap, const SkIRect& rect, BitmapInit init, SkColorType ct, 221 SkAlphaType at) { 222 SkImageInfo info = SkImageInfo::Make(rect.width(), rect.height(), ct, at); 223 size_t rowBytes = 0; 224 bool alloc = true; 225 switch (init) { 226 case kNoPixels_BitmapInit: 227 alloc = false; 228 case kTight_BitmapInit: 229 break; 230 case kRowBytes_BitmapInit: 231 rowBytes = (info.width() + 16) * sizeof(SkPMColor); 232 break; 233 default: 234 SkASSERT(0); 235 break; 236 } 237 238 if (alloc) { 239 bitmap->allocPixels(info); 240 } else { 241 bitmap->setInfo(info, rowBytes); 242 } 243 } 244 245 DEF_GPUTEST(ReadPixels, reporter, factory) { 246 const SkIRect testRects[] = { 247 // entire thing 248 DEV_RECT, 249 // larger on all sides 250 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H + 10), 251 // fully contained 252 SkIRect::MakeLTRB(DEV_W / 4, DEV_H / 4, 3 * DEV_W / 4, 3 * DEV_H / 4), 253 // outside top left 254 SkIRect::MakeLTRB(-10, -10, -1, -1), 255 // touching top left corner 256 SkIRect::MakeLTRB(-10, -10, 0, 0), 257 // overlapping top left corner 258 SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H / 4), 259 // overlapping top left and top right corners 260 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H / 4), 261 // touching entire top edge 262 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, 0), 263 // overlapping top right corner 264 SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H / 4), 265 // contained in x, overlapping top edge 266 SkIRect::MakeLTRB(DEV_W / 4, -10, 3 * DEV_W / 4, DEV_H / 4), 267 // outside top right corner 268 SkIRect::MakeLTRB(DEV_W + 1, -10, DEV_W + 10, -1), 269 // touching top right corner 270 SkIRect::MakeLTRB(DEV_W, -10, DEV_W + 10, 0), 271 // overlapping top left and bottom left corners 272 SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H + 10), 273 // touching entire left edge 274 SkIRect::MakeLTRB(-10, -10, 0, DEV_H + 10), 275 // overlapping bottom left corner 276 SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W / 4, DEV_H + 10), 277 // contained in y, overlapping left edge 278 SkIRect::MakeLTRB(-10, DEV_H / 4, DEV_W / 4, 3 * DEV_H / 4), 279 // outside bottom left corner 280 SkIRect::MakeLTRB(-10, DEV_H + 1, -1, DEV_H + 10), 281 // touching bottom left corner 282 SkIRect::MakeLTRB(-10, DEV_H, 0, DEV_H + 10), 283 // overlapping bottom left and bottom right corners 284 SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10), 285 // touching entire left edge 286 SkIRect::MakeLTRB(0, DEV_H, DEV_W, DEV_H + 10), 287 // overlapping bottom right corner 288 SkIRect::MakeLTRB(3 * DEV_W / 4, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10), 289 // overlapping top right and bottom right corners 290 SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H + 10), 291 }; 292 293 for (int dtype = 0; dtype < 3; ++dtype) { 294 int glCtxTypeCnt = 1; 295 #if SK_SUPPORT_GPU 296 if (0 != dtype) { 297 glCtxTypeCnt = GrContextFactory::kGLContextTypeCnt; 298 } 299 #endif 300 for (int glCtxType = 0; glCtxType < glCtxTypeCnt; ++glCtxType) { 301 SkAutoTUnref<SkBaseDevice> device; 302 if (0 == dtype) { 303 SkImageInfo info = SkImageInfo::MakeN32Premul(DEV_W, DEV_H); 304 device.reset(SkBitmapDevice::Create(info)); 305 } else { 306 #if SK_SUPPORT_GPU 307 GrContextFactory::GLContextType type = 308 static_cast<GrContextFactory::GLContextType>(glCtxType); 309 if (!GrContextFactory::IsRenderingGLContext(type)) { 310 continue; 311 } 312 GrContext* context = factory->get(type); 313 if (NULL == context) { 314 continue; 315 } 316 GrTextureDesc desc; 317 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit; 318 desc.fWidth = DEV_W; 319 desc.fHeight = DEV_H; 320 desc.fConfig = kSkia8888_GrPixelConfig; 321 desc.fOrigin = 1 == dtype ? kBottomLeft_GrSurfaceOrigin 322 : kTopLeft_GrSurfaceOrigin; 323 GrAutoScratchTexture ast(context, desc, GrContext::kExact_ScratchTexMatch); 324 SkAutoTUnref<GrTexture> tex(ast.detach()); 325 device.reset(new SkGpuDevice(context, tex)); 326 #else 327 continue; 328 #endif 329 } 330 SkCanvas canvas(device); 331 fillCanvas(&canvas); 332 333 static const struct { 334 SkColorType fColorType; 335 SkAlphaType fAlphaType; 336 } gReadConfigs[] = { 337 { kRGBA_8888_SkColorType, kPremul_SkAlphaType }, 338 { kRGBA_8888_SkColorType, kUnpremul_SkAlphaType }, 339 { kBGRA_8888_SkColorType, kPremul_SkAlphaType }, 340 { kBGRA_8888_SkColorType, kUnpremul_SkAlphaType }, 341 }; 342 for (size_t rect = 0; rect < SK_ARRAY_COUNT(testRects); ++rect) { 343 const SkIRect& srcRect = testRects[rect]; 344 for (BitmapInit bmi = kFirstBitmapInit; bmi < kBitmapInitCnt; bmi = nextBMI(bmi)) { 345 for (size_t c = 0; c < SK_ARRAY_COUNT(gReadConfigs); ++c) { 346 SkBitmap bmp; 347 init_bitmap(&bmp, srcRect, bmi, 348 gReadConfigs[c].fColorType, gReadConfigs[c].fAlphaType); 349 350 // if the bitmap has pixels allocated before the readPixels, 351 // note that and fill them with pattern 352 bool startsWithPixels = !bmp.isNull(); 353 if (startsWithPixels) { 354 fillBitmap(&bmp); 355 } 356 uint32_t idBefore = canvas.getDevice()->accessBitmap(false).getGenerationID(); 357 bool success = canvas.readPixels(&bmp, srcRect.fLeft, srcRect.fTop); 358 uint32_t idAfter = canvas.getDevice()->accessBitmap(false).getGenerationID(); 359 360 // we expect to succeed when the read isn't fully clipped 361 // out. 362 bool expectSuccess = SkIRect::Intersects(srcRect, DEV_RECT); 363 // determine whether we expected the read to succeed. 364 REPORTER_ASSERT(reporter, success == expectSuccess); 365 // read pixels should never change the gen id 366 REPORTER_ASSERT(reporter, idBefore == idAfter); 367 368 if (success || startsWithPixels) { 369 checkRead(reporter, bmp, srcRect.fLeft, srcRect.fTop, 370 success, startsWithPixels); 371 } else { 372 // if we had no pixels beforehand and the readPixels 373 // failed then our bitmap should still not have pixels 374 REPORTER_ASSERT(reporter, bmp.isNull()); 375 } 376 } 377 // check the old webkit version of readPixels that clips the 378 // bitmap size 379 SkBitmap wkbmp; 380 bool success = canvas.readPixels(srcRect, &wkbmp); 381 SkIRect clippedRect = DEV_RECT; 382 if (clippedRect.intersect(srcRect)) { 383 REPORTER_ASSERT(reporter, success); 384 REPORTER_ASSERT(reporter, kN32_SkColorType == wkbmp.colorType()); 385 REPORTER_ASSERT(reporter, kPremul_SkAlphaType == wkbmp.alphaType()); 386 checkRead(reporter, wkbmp, clippedRect.fLeft, 387 clippedRect.fTop, true, false); 388 } else { 389 REPORTER_ASSERT(reporter, !success); 390 } 391 } 392 } 393 } 394 } 395 } 396
