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 "SkCanvas.h" 9 #include "SkColorPriv.h" 10 #include "SkMathPriv.h" 11 #include "SkRegion.h" 12 #include "SkSurface.h" 13 #include "Test.h" 14 15 #if SK_SUPPORT_GPU 16 #include "GrContext.h" 17 #include "SkGr.h" 18 #endif 19 20 #include <initializer_list> 21 22 static const int DEV_W = 100, DEV_H = 100; 23 static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H); 24 static const SkRect DEV_RECT_S = SkRect::MakeWH(DEV_W * SK_Scalar1, 25 DEV_H * SK_Scalar1); 26 27 static SkPMColor get_src_color(int x, int y) { 28 SkASSERT(x >= 0 && x < DEV_W); 29 SkASSERT(y >= 0 && y < DEV_H); 30 31 U8CPU r = x; 32 U8CPU g = y; 33 U8CPU b = 0xc; 34 35 U8CPU a = 0xff; 36 switch ((x+y) % 5) { 37 case 0: 38 a = 0xff; 39 break; 40 case 1: 41 a = 0x80; 42 break; 43 case 2: 44 a = 0xCC; 45 break; 46 case 4: 47 a = 0x01; 48 break; 49 case 3: 50 a = 0x00; 51 break; 52 } 53 return SkPremultiplyARGBInline(a, r, g, b); 54 } 55 56 static SkPMColor get_dst_bmp_init_color(int x, int y, int w) { 57 int n = y * w + x; 58 59 U8CPU b = n & 0xff; 60 U8CPU g = (n >> 8) & 0xff; 61 U8CPU r = (n >> 16) & 0xff; 62 return SkPackARGB32(0xff, r, g , b); 63 } 64 65 static SkPMColor convert_to_pmcolor(SkColorType ct, SkAlphaType at, const uint32_t* addr, 66 bool* doUnpremul) { 67 *doUnpremul = (kUnpremul_SkAlphaType == at); 68 69 const uint8_t* c = reinterpret_cast<const uint8_t*>(addr); 70 U8CPU a,r,g,b; 71 switch (ct) { 72 case kBGRA_8888_SkColorType: 73 b = static_cast<U8CPU>(c[0]); 74 g = static_cast<U8CPU>(c[1]); 75 r = static_cast<U8CPU>(c[2]); 76 a = static_cast<U8CPU>(c[3]); 77 break; 78 case kRGBA_8888_SkColorType: 79 r = static_cast<U8CPU>(c[0]); 80 g = static_cast<U8CPU>(c[1]); 81 b = static_cast<U8CPU>(c[2]); 82 a = static_cast<U8CPU>(c[3]); 83 break; 84 default: 85 SkDEBUGFAIL("Unexpected colortype"); 86 return 0; 87 } 88 89 if (*doUnpremul) { 90 r = SkMulDiv255Ceiling(r, a); 91 g = SkMulDiv255Ceiling(g, a); 92 b = SkMulDiv255Ceiling(b, a); 93 } 94 return SkPackARGB32(a, r, g, b); 95 } 96 97 static SkBitmap make_src_bitmap() { 98 static SkBitmap bmp; 99 if (bmp.isNull()) { 100 bmp.allocN32Pixels(DEV_W, DEV_H); 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 = get_src_color(x, y); 106 } 107 } 108 } 109 return bmp; 110 } 111 112 static void fill_src_canvas(SkCanvas* canvas) { 113 canvas->save(); 114 canvas->setMatrix(SkMatrix::I()); 115 canvas->clipRect(DEV_RECT_S, SkRegion::kReplace_Op); 116 SkPaint paint; 117 paint.setXfermodeMode(SkXfermode::kSrc_Mode); 118 canvas->drawBitmap(make_src_bitmap(), 0, 0, &paint); 119 canvas->restore(); 120 } 121 122 #if SK_SUPPORT_GPU 123 static void fill_src_texture(GrTexture* texture) { 124 SkBitmap bmp = make_src_bitmap(); 125 bmp.lockPixels(); 126 texture->writePixels(0, 0, DEV_W, DEV_H, kSkia8888_GrPixelConfig, bmp.getPixels(), 127 bmp.rowBytes()); 128 bmp.unlockPixels(); 129 } 130 #endif 131 132 static void fill_dst_bmp_with_init_data(SkBitmap* bitmap) { 133 SkASSERT(bitmap->lockPixelsAreWritable()); 134 SkAutoLockPixels alp(*bitmap); 135 int w = bitmap->width(); 136 int h = bitmap->height(); 137 intptr_t pixels = reinterpret_cast<intptr_t>(bitmap->getPixels()); 138 for (int y = 0; y < h; ++y) { 139 for (int x = 0; x < w; ++x) { 140 SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bitmap->rowBytes() + x * bitmap->bytesPerPixel()); 141 *pixel = get_dst_bmp_init_color(x, y, w); 142 } 143 } 144 } 145 146 static bool check_read_pixel(SkPMColor a, SkPMColor b, bool didPremulConversion) { 147 if (!didPremulConversion) { 148 return a == b; 149 } 150 int32_t aA = static_cast<int32_t>(SkGetPackedA32(a)); 151 int32_t aR = static_cast<int32_t>(SkGetPackedR32(a)); 152 int32_t aG = static_cast<int32_t>(SkGetPackedG32(a)); 153 int32_t aB = SkGetPackedB32(a); 154 155 int32_t bA = static_cast<int32_t>(SkGetPackedA32(b)); 156 int32_t bR = static_cast<int32_t>(SkGetPackedR32(b)); 157 int32_t bG = static_cast<int32_t>(SkGetPackedG32(b)); 158 int32_t bB = static_cast<int32_t>(SkGetPackedB32(b)); 159 160 return aA == bA && 161 SkAbs32(aR - bR) <= 1 && 162 SkAbs32(aG - bG) <= 1 && 163 SkAbs32(aB - bB) <= 1; 164 } 165 166 // checks the bitmap contains correct pixels after the readPixels 167 // if the bitmap was prefilled with pixels it checks that these weren't 168 // overwritten in the area outside the readPixels. 169 static bool check_read(skiatest::Reporter* reporter, 170 const SkBitmap& bitmap, 171 int x, int y, 172 bool checkCanvasPixels, 173 bool checkBitmapPixels) { 174 SkASSERT(4 == bitmap.bytesPerPixel()); 175 SkASSERT(!bitmap.isNull()); 176 SkASSERT(checkCanvasPixels || checkBitmapPixels); 177 178 const SkColorType ct = bitmap.colorType(); 179 const SkAlphaType at = bitmap.alphaType(); 180 181 int bw = bitmap.width(); 182 int bh = bitmap.height(); 183 184 SkIRect srcRect = SkIRect::MakeXYWH(x, y, bw, bh); 185 SkIRect clippedSrcRect = DEV_RECT; 186 if (!clippedSrcRect.intersect(srcRect)) { 187 clippedSrcRect.setEmpty(); 188 } 189 SkAutoLockPixels alp(bitmap); 190 for (int by = 0; by < bh; ++by) { 191 for (int bx = 0; bx < bw; ++bx) { 192 int devx = bx + srcRect.fLeft; 193 int devy = by + srcRect.fTop; 194 195 const uint32_t* pixel = bitmap.getAddr32(bx, by); 196 197 if (clippedSrcRect.contains(devx, devy)) { 198 if (checkCanvasPixels) { 199 SkPMColor canvasPixel = get_src_color(devx, devy); 200 bool didPremul; 201 SkPMColor pmPixel = convert_to_pmcolor(ct, at, pixel, &didPremul); 202 if (!check_read_pixel(pmPixel, canvasPixel, didPremul)) { 203 ERRORF(reporter, "Expected readback pixel value 0x%08x, got 0x%08x. " 204 "Readback was unpremul: %d", canvasPixel, pmPixel, didPremul); 205 return false; 206 } 207 } 208 } else if (checkBitmapPixels) { 209 uint32_t origDstPixel = get_dst_bmp_init_color(bx, by, bw); 210 if (origDstPixel != *pixel) { 211 ERRORF(reporter, "Expected clipped out area of readback to be unchanged. " 212 "Expected 0x%08x, got 0x%08x", origDstPixel, *pixel); 213 return false; 214 } 215 } 216 } 217 } 218 return true; 219 } 220 221 enum BitmapInit { 222 kFirstBitmapInit = 0, 223 224 kNoPixels_BitmapInit = kFirstBitmapInit, 225 kTight_BitmapInit, 226 kRowBytes_BitmapInit, 227 kRowBytesOdd_BitmapInit, 228 229 kLastAligned_BitmapInit = kRowBytes_BitmapInit, 230 231 #if 0 // THIS CAUSES ERRORS ON WINDOWS AND SOME ANDROID DEVICES 232 kLast_BitmapInit = kRowBytesOdd_BitmapInit 233 #else 234 kLast_BitmapInit = kLastAligned_BitmapInit 235 #endif 236 }; 237 238 static BitmapInit nextBMI(BitmapInit bmi) { 239 int x = bmi; 240 return static_cast<BitmapInit>(++x); 241 } 242 243 static void init_bitmap(SkBitmap* bitmap, const SkIRect& rect, BitmapInit init, SkColorType ct, 244 SkAlphaType at) { 245 SkImageInfo info = SkImageInfo::Make(rect.width(), rect.height(), ct, at); 246 size_t rowBytes = 0; 247 bool alloc = true; 248 switch (init) { 249 case kNoPixels_BitmapInit: 250 alloc = false; 251 case kTight_BitmapInit: 252 break; 253 case kRowBytes_BitmapInit: 254 rowBytes = (info.width() + 16) * sizeof(SkPMColor); 255 break; 256 case kRowBytesOdd_BitmapInit: 257 rowBytes = (info.width() * sizeof(SkPMColor)) + 3; 258 break; 259 default: 260 SkASSERT(0); 261 break; 262 } 263 264 if (alloc) { 265 bitmap->allocPixels(info, rowBytes); 266 } else { 267 bitmap->setInfo(info, rowBytes); 268 } 269 } 270 271 static const struct { 272 SkColorType fColorType; 273 SkAlphaType fAlphaType; 274 } gReadPixelsConfigs[] = { 275 { kRGBA_8888_SkColorType, kPremul_SkAlphaType }, 276 { kRGBA_8888_SkColorType, kUnpremul_SkAlphaType }, 277 { kBGRA_8888_SkColorType, kPremul_SkAlphaType }, 278 { kBGRA_8888_SkColorType, kUnpremul_SkAlphaType }, 279 }; 280 const SkIRect gReadPixelsTestRects[] = { 281 // entire thing 282 DEV_RECT, 283 // larger on all sides 284 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H + 10), 285 // fully contained 286 SkIRect::MakeLTRB(DEV_W / 4, DEV_H / 4, 3 * DEV_W / 4, 3 * DEV_H / 4), 287 // outside top left 288 SkIRect::MakeLTRB(-10, -10, -1, -1), 289 // touching top left corner 290 SkIRect::MakeLTRB(-10, -10, 0, 0), 291 // overlapping top left corner 292 SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H / 4), 293 // overlapping top left and top right corners 294 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H / 4), 295 // touching entire top edge 296 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, 0), 297 // overlapping top right corner 298 SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H / 4), 299 // contained in x, overlapping top edge 300 SkIRect::MakeLTRB(DEV_W / 4, -10, 3 * DEV_W / 4, DEV_H / 4), 301 // outside top right corner 302 SkIRect::MakeLTRB(DEV_W + 1, -10, DEV_W + 10, -1), 303 // touching top right corner 304 SkIRect::MakeLTRB(DEV_W, -10, DEV_W + 10, 0), 305 // overlapping top left and bottom left corners 306 SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H + 10), 307 // touching entire left edge 308 SkIRect::MakeLTRB(-10, -10, 0, DEV_H + 10), 309 // overlapping bottom left corner 310 SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W / 4, DEV_H + 10), 311 // contained in y, overlapping left edge 312 SkIRect::MakeLTRB(-10, DEV_H / 4, DEV_W / 4, 3 * DEV_H / 4), 313 // outside bottom left corner 314 SkIRect::MakeLTRB(-10, DEV_H + 1, -1, DEV_H + 10), 315 // touching bottom left corner 316 SkIRect::MakeLTRB(-10, DEV_H, 0, DEV_H + 10), 317 // overlapping bottom left and bottom right corners 318 SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10), 319 // touching entire left edge 320 SkIRect::MakeLTRB(0, DEV_H, DEV_W, DEV_H + 10), 321 // overlapping bottom right corner 322 SkIRect::MakeLTRB(3 * DEV_W / 4, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10), 323 // overlapping top right and bottom right corners 324 SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H + 10), 325 }; 326 327 static void test_readpixels(skiatest::Reporter* reporter, SkSurface* surface, 328 BitmapInit lastBitmapInit) { 329 SkCanvas* canvas = surface->getCanvas(); 330 fill_src_canvas(canvas); 331 for (size_t rect = 0; rect < SK_ARRAY_COUNT(gReadPixelsTestRects); ++rect) { 332 const SkIRect& srcRect = gReadPixelsTestRects[rect]; 333 for (BitmapInit bmi = kFirstBitmapInit; bmi <= lastBitmapInit; bmi = nextBMI(bmi)) { 334 for (size_t c = 0; c < SK_ARRAY_COUNT(gReadPixelsConfigs); ++c) { 335 SkBitmap bmp; 336 init_bitmap(&bmp, srcRect, bmi, 337 gReadPixelsConfigs[c].fColorType, gReadPixelsConfigs[c].fAlphaType); 338 339 // if the bitmap has pixels allocated before the readPixels, 340 // note that and fill them with pattern 341 bool startsWithPixels = !bmp.isNull(); 342 if (startsWithPixels) { 343 fill_dst_bmp_with_init_data(&bmp); 344 } 345 uint32_t idBefore = surface->generationID(); 346 bool success = canvas->readPixels(&bmp, srcRect.fLeft, srcRect.fTop); 347 uint32_t idAfter = surface->generationID(); 348 349 // we expect to succeed when the read isn't fully clipped 350 // out. 351 bool expectSuccess = SkIRect::Intersects(srcRect, DEV_RECT); 352 // determine whether we expected the read to succeed. 353 REPORTER_ASSERT(reporter, success == expectSuccess); 354 // read pixels should never change the gen id 355 REPORTER_ASSERT(reporter, idBefore == idAfter); 356 357 if (success || startsWithPixels) { 358 check_read(reporter, bmp, srcRect.fLeft, srcRect.fTop, 359 success, startsWithPixels); 360 } else { 361 // if we had no pixels beforehand and the readPixels 362 // failed then our bitmap should still not have pixels 363 REPORTER_ASSERT(reporter, bmp.isNull()); 364 } 365 } 366 // check the old webkit version of readPixels that clips the 367 // bitmap size 368 SkBitmap wkbmp; 369 bool success = canvas->readPixels(srcRect, &wkbmp); 370 SkIRect clippedRect = DEV_RECT; 371 if (clippedRect.intersect(srcRect)) { 372 REPORTER_ASSERT(reporter, success); 373 REPORTER_ASSERT(reporter, kN32_SkColorType == wkbmp.colorType()); 374 REPORTER_ASSERT(reporter, kPremul_SkAlphaType == wkbmp.alphaType()); 375 check_read(reporter, wkbmp, clippedRect.fLeft, 376 clippedRect.fTop, true, false); 377 } else { 378 REPORTER_ASSERT(reporter, !success); 379 } 380 } 381 } 382 } 383 DEF_TEST(ReadPixels, reporter) { 384 const SkImageInfo info = SkImageInfo::MakeN32Premul(DEV_W, DEV_H); 385 SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(info)); 386 // SW readback fails a premul check when reading back to an unaligned rowbytes. 387 test_readpixels(reporter, surface, kLastAligned_BitmapInit); 388 } 389 #if SK_SUPPORT_GPU 390 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadPixels_Gpu, reporter, context) { 391 for (auto& origin : {kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin}) { 392 GrSurfaceDesc desc; 393 desc.fFlags = kRenderTarget_GrSurfaceFlag; 394 desc.fWidth = DEV_W; 395 desc.fHeight = DEV_H; 396 desc.fConfig = kSkia8888_GrPixelConfig; 397 desc.fOrigin = origin; 398 SkAutoTUnref<GrTexture> surfaceTexture( 399 context->textureProvider()->createTexture(desc, SkBudgeted::kNo)); 400 SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(surfaceTexture->asRenderTarget())); 401 desc.fFlags = kNone_GrSurfaceFlags; 402 test_readpixels(reporter, surface, kLast_BitmapInit); 403 } 404 } 405 #endif 406 407 #if SK_SUPPORT_GPU 408 static void test_readpixels_texture(skiatest::Reporter* reporter, GrTexture* texture) { 409 fill_src_texture(texture); 410 for (size_t rect = 0; rect < SK_ARRAY_COUNT(gReadPixelsTestRects); ++rect) { 411 const SkIRect& srcRect = gReadPixelsTestRects[rect]; 412 for (BitmapInit bmi = kFirstBitmapInit; bmi <= kLast_BitmapInit; bmi = nextBMI(bmi)) { 413 for (size_t c = 0; c < SK_ARRAY_COUNT(gReadPixelsConfigs); ++c) { 414 SkBitmap bmp; 415 init_bitmap(&bmp, srcRect, bmi, 416 gReadPixelsConfigs[c].fColorType, gReadPixelsConfigs[c].fAlphaType); 417 418 // if the bitmap has pixels allocated before the readPixels, 419 // note that and fill them with pattern 420 bool startsWithPixels = !bmp.isNull(); 421 // Try doing the read directly from a non-renderable texture 422 if (startsWithPixels) { 423 fill_dst_bmp_with_init_data(&bmp); 424 GrPixelConfig dstConfig = 425 SkImageInfo2GrPixelConfig(gReadPixelsConfigs[c].fColorType, 426 gReadPixelsConfigs[c].fAlphaType, 427 kLinear_SkColorProfileType); 428 uint32_t flags = 0; 429 if (gReadPixelsConfigs[c].fAlphaType == kUnpremul_SkAlphaType) { 430 flags = GrContext::kUnpremul_PixelOpsFlag; 431 } 432 bmp.lockPixels(); 433 bool success = texture->readPixels(srcRect.fLeft, srcRect.fTop, bmp.width(), 434 bmp.height(), dstConfig, bmp.getPixels(), 435 bmp.rowBytes(), flags); 436 bmp.unlockPixels(); 437 check_read(reporter, bmp, srcRect.fLeft, srcRect.fTop, 438 success, true); 439 } 440 } 441 } 442 } 443 } 444 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReadPixels_Texture, reporter, context) { 445 // On the GPU we will also try reading back from a non-renderable texture. 446 for (auto& origin : {kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin}) { 447 SkAutoTUnref<GrTexture> texture; 448 GrSurfaceDesc desc; 449 desc.fFlags = kRenderTarget_GrSurfaceFlag; 450 desc.fWidth = DEV_W; 451 desc.fHeight = DEV_H; 452 desc.fConfig = kSkia8888_GrPixelConfig; 453 desc.fOrigin = origin; 454 desc.fFlags = kNone_GrSurfaceFlags; 455 texture.reset(context->textureProvider()->createTexture(desc, SkBudgeted::kNo)); 456 test_readpixels_texture(reporter, texture); 457 } 458 } 459 #endif 460 ///////////////////// 461 #if SK_SUPPORT_GPU 462 463 // make_ringed_bitmap was lifted from gm/bleed.cpp, as that GM was what showed the following 464 // bug when a change was made to SkImage_Raster.cpp. It is possible that other test bitmaps 465 // would also tickle https://bug.skia.org/4351 but this one is know to do it, so I've pasted the code 466 // here so we have a dependable repro case. 467 468 // Create a black&white checked texture with 2 1-pixel rings 469 // around the outside edge. The inner ring is red and the outer ring is blue. 470 static void make_ringed_bitmap(SkBitmap* result, int width, int height) { 471 SkASSERT(0 == width % 2 && 0 == height % 2); 472 473 static const SkPMColor kRed = SkPreMultiplyColor(SK_ColorRED); 474 static const SkPMColor kBlue = SkPreMultiplyColor(SK_ColorBLUE); 475 static const SkPMColor kBlack = SkPreMultiplyColor(SK_ColorBLACK); 476 static const SkPMColor kWhite = SkPreMultiplyColor(SK_ColorWHITE); 477 478 result->allocN32Pixels(width, height, true); 479 480 SkPMColor* scanline = result->getAddr32(0, 0); 481 for (int x = 0; x < width; ++x) { 482 scanline[x] = kBlue; 483 } 484 scanline = result->getAddr32(0, 1); 485 scanline[0] = kBlue; 486 for (int x = 1; x < width - 1; ++x) { 487 scanline[x] = kRed; 488 } 489 scanline[width-1] = kBlue; 490 491 for (int y = 2; y < height/2; ++y) { 492 scanline = result->getAddr32(0, y); 493 scanline[0] = kBlue; 494 scanline[1] = kRed; 495 for (int x = 2; x < width/2; ++x) { 496 scanline[x] = kBlack; 497 } 498 for (int x = width/2; x < width-2; ++x) { 499 scanline[x] = kWhite; 500 } 501 scanline[width-2] = kRed; 502 scanline[width-1] = kBlue; 503 } 504 505 for (int y = height/2; y < height-2; ++y) { 506 scanline = result->getAddr32(0, y); 507 scanline[0] = kBlue; 508 scanline[1] = kRed; 509 for (int x = 2; x < width/2; ++x) { 510 scanline[x] = kWhite; 511 } 512 for (int x = width/2; x < width-2; ++x) { 513 scanline[x] = kBlack; 514 } 515 scanline[width-2] = kRed; 516 scanline[width-1] = kBlue; 517 } 518 519 scanline = result->getAddr32(0, height-2); 520 scanline[0] = kBlue; 521 for (int x = 1; x < width - 1; ++x) { 522 scanline[x] = kRed; 523 } 524 scanline[width-1] = kBlue; 525 526 scanline = result->getAddr32(0, height-1); 527 for (int x = 0; x < width; ++x) { 528 scanline[x] = kBlue; 529 } 530 result->setImmutable(); 531 } 532 533 static void compare_textures(skiatest::Reporter* reporter, GrTexture* txa, GrTexture* txb) { 534 REPORTER_ASSERT(reporter, txa->width() == 2); 535 REPORTER_ASSERT(reporter, txa->height() == 2); 536 REPORTER_ASSERT(reporter, txb->width() == 2); 537 REPORTER_ASSERT(reporter, txb->height() == 2); 538 REPORTER_ASSERT(reporter, txa->config() == txb->config()); 539 540 SkPMColor pixelsA[4], pixelsB[4]; 541 REPORTER_ASSERT(reporter, txa->readPixels(0, 0, 2, 2, txa->config(), pixelsA)); 542 REPORTER_ASSERT(reporter, txb->readPixels(0, 0, 2, 2, txa->config(), pixelsB)); 543 REPORTER_ASSERT(reporter, 0 == memcmp(pixelsA, pixelsB, sizeof(pixelsA))); 544 } 545 546 static SkData* draw_into_surface(SkSurface* surf, const SkBitmap& bm, SkFilterQuality quality) { 547 SkCanvas* canvas = surf->getCanvas(); 548 canvas->clear(SK_ColorBLUE); 549 550 SkPaint paint; 551 paint.setFilterQuality(quality); 552 553 canvas->translate(40, 100); 554 canvas->rotate(30); 555 canvas->scale(20, 30); 556 canvas->translate(-SkScalarHalf(bm.width()), -SkScalarHalf(bm.height())); 557 canvas->drawBitmap(bm, 0, 0, &paint); 558 559 SkAutoTUnref<SkImage> image(surf->newImageSnapshot()); 560 return image->encode(); 561 } 562 563 #include "SkStream.h" 564 static void dump_to_file(const char name[], SkData* data) { 565 SkFILEWStream file(name); 566 file.write(data->data(), data->size()); 567 } 568 569 /* 570 * Test two different ways to turn a subset of a bitmap into a texture 571 * - subset and then upload to a texture 572 * - upload to a texture and then subset 573 * 574 * These two techniques result in the same pixels (ala readPixels) 575 * but when we draw them (rotated+scaled) we don't always get the same results. 576 * 577 * https://bug.skia.org/4351 578 */ 579 DEF_GPUTEST_FOR_NATIVE_CONTEXT(ReadPixels_Subset_Gpu, reporter, context) { 580 SkBitmap bitmap; 581 make_ringed_bitmap(&bitmap, 6, 6); 582 const SkIRect subset = SkIRect::MakeLTRB(2, 2, 4, 4); 583 584 // make two textures... 585 SkBitmap bm_subset, tx_subset; 586 587 // ... one from a texture-subset 588 SkAutoTUnref<GrTexture> fullTx(GrRefCachedBitmapTexture(context, bitmap, 589 GrTextureParams::ClampNoFilter())); 590 SkBitmap tx_full; 591 GrWrapTextureInBitmap(fullTx, bitmap.width(), bitmap.height(), true, &tx_full); 592 tx_full.extractSubset(&tx_subset, subset); 593 594 // ... one from a bitmap-subset 595 SkBitmap tmp_subset; 596 bitmap.extractSubset(&tmp_subset, subset); 597 SkAutoTUnref<GrTexture> subsetTx(GrRefCachedBitmapTexture(context, tmp_subset, 598 GrTextureParams::ClampNoFilter())); 599 GrWrapTextureInBitmap(subsetTx, tmp_subset.width(), tmp_subset.height(), true, &bm_subset); 600 601 // did we get the same subset? 602 compare_textures(reporter, bm_subset.getTexture(), tx_subset.getTexture()); 603 604 // do they draw the same? 605 const SkImageInfo info = SkImageInfo::MakeN32Premul(128, 128); 606 SkAutoTUnref<SkSurface> surfA(SkSurface::NewRenderTarget(context, SkBudgeted::kNo, info, 0)); 607 SkAutoTUnref<SkSurface> surfB(SkSurface::NewRenderTarget(context, SkBudgeted::kNo, info, 0)); 608 609 if (false) { 610 // 611 // BUG: depending on the driver, if we calls this with various quality settings, it 612 // may fail. 613 // 614 SkFilterQuality quality = kLow_SkFilterQuality; 615 616 SkAutoTUnref<SkData> dataA(draw_into_surface(surfA, bm_subset, quality)); 617 SkAutoTUnref<SkData> dataB(draw_into_surface(surfB, tx_subset, quality)); 618 619 REPORTER_ASSERT(reporter, dataA->equals(dataB)); 620 if (false) { 621 dump_to_file("test_image_A.png", dataA); 622 dump_to_file("test_image_B.png", dataB); 623 } 624 } 625 } 626 #endif 627
