SkColorSpace.cpp revision ecaaf6f1c156e5690200322fc2636380c1f63dd8
1/* 2 * Copyright 2016 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 "SkColorSpace.h" 9#include "SkColorSpace_Base.h" 10#include "SkColorSpace_XYZ.h" 11#include "SkColorSpacePriv.h" 12#include "SkOnce.h" 13#include "SkPoint3.h" 14 15bool SkColorSpacePrimaries::toXYZD50(SkMatrix44* toXYZ_D50) const { 16 if (!is_zero_to_one(fRX) || !is_zero_to_one(fRY) || 17 !is_zero_to_one(fGX) || !is_zero_to_one(fGY) || 18 !is_zero_to_one(fBX) || !is_zero_to_one(fBY) || 19 !is_zero_to_one(fWX) || !is_zero_to_one(fWY)) 20 { 21 return false; 22 } 23 24 // First, we need to convert xy values (primaries) to XYZ. 25 SkMatrix primaries; 26 primaries.setAll( fRX, fGX, fBX, 27 fRY, fGY, fBY, 28 1.0f - fRX - fRY, 1.0f - fGX - fGY, 1.0f - fBX - fBY); 29 SkMatrix primariesInv; 30 if (!primaries.invert(&primariesInv)) { 31 return false; 32 } 33 34 // Assumes that Y is 1.0f. 35 SkVector3 wXYZ = SkVector3::Make(fWX / fWY, 1.0f, (1.0f - fWX - fWY) / fWY); 36 SkVector3 XYZ; 37 XYZ.fX = primariesInv[0] * wXYZ.fX + primariesInv[1] * wXYZ.fY + primariesInv[2] * wXYZ.fZ; 38 XYZ.fY = primariesInv[3] * wXYZ.fX + primariesInv[4] * wXYZ.fY + primariesInv[5] * wXYZ.fZ; 39 XYZ.fZ = primariesInv[6] * wXYZ.fX + primariesInv[7] * wXYZ.fY + primariesInv[8] * wXYZ.fZ; 40 SkMatrix toXYZ; 41 toXYZ.setAll(XYZ.fX, 0.0f, 0.0f, 42 0.0f, XYZ.fY, 0.0f, 43 0.0f, 0.0f, XYZ.fZ); 44 toXYZ.postConcat(primaries); 45 46 // Now convert toXYZ matrix to toXYZD50. 47 SkVector3 wXYZD50 = SkVector3::Make(0.96422f, 1.0f, 0.82521f); 48 49 // Calculate the chromatic adaptation matrix. We will use the Bradford method, thus 50 // the matrices below. The Bradford method is used by Adobe and is widely considered 51 // to be the best. 52 SkMatrix mA, mAInv; 53 mA.setAll(+0.8951f, +0.2664f, -0.1614f, 54 -0.7502f, +1.7135f, +0.0367f, 55 +0.0389f, -0.0685f, +1.0296f); 56 mAInv.setAll(+0.9869929f, -0.1470543f, +0.1599627f, 57 +0.4323053f, +0.5183603f, +0.0492912f, 58 -0.0085287f, +0.0400428f, +0.9684867f); 59 60 SkVector3 srcCone; 61 srcCone.fX = mA[0] * wXYZ.fX + mA[1] * wXYZ.fY + mA[2] * wXYZ.fZ; 62 srcCone.fY = mA[3] * wXYZ.fX + mA[4] * wXYZ.fY + mA[5] * wXYZ.fZ; 63 srcCone.fZ = mA[6] * wXYZ.fX + mA[7] * wXYZ.fY + mA[8] * wXYZ.fZ; 64 SkVector3 dstCone; 65 dstCone.fX = mA[0] * wXYZD50.fX + mA[1] * wXYZD50.fY + mA[2] * wXYZD50.fZ; 66 dstCone.fY = mA[3] * wXYZD50.fX + mA[4] * wXYZD50.fY + mA[5] * wXYZD50.fZ; 67 dstCone.fZ = mA[6] * wXYZD50.fX + mA[7] * wXYZD50.fY + mA[8] * wXYZD50.fZ; 68 69 SkMatrix DXToD50; 70 DXToD50.setIdentity(); 71 DXToD50[0] = dstCone.fX / srcCone.fX; 72 DXToD50[4] = dstCone.fY / srcCone.fY; 73 DXToD50[8] = dstCone.fZ / srcCone.fZ; 74 DXToD50.postConcat(mAInv); 75 DXToD50.preConcat(mA); 76 77 toXYZ.postConcat(DXToD50); 78 toXYZ_D50->set3x3(toXYZ[0], toXYZ[3], toXYZ[6], 79 toXYZ[1], toXYZ[4], toXYZ[7], 80 toXYZ[2], toXYZ[5], toXYZ[8]); 81 return true; 82} 83 84/////////////////////////////////////////////////////////////////////////////////////////////////// 85 86SkColorSpace_Base::SkColorSpace_Base(sk_sp<SkData> profileData) 87 : fProfileData(std::move(profileData)) 88{} 89 90/** 91 * Checks if our toXYZ matrix is a close match to a known color gamut. 92 * 93 * @param toXYZD50 transformation matrix deduced from profile data 94 * @param standard 3x3 canonical transformation matrix 95 */ 96static bool xyz_almost_equal(const SkMatrix44& toXYZD50, const float* standard) { 97 return color_space_almost_equal(toXYZD50.getFloat(0, 0), standard[0]) && 98 color_space_almost_equal(toXYZD50.getFloat(0, 1), standard[1]) && 99 color_space_almost_equal(toXYZD50.getFloat(0, 2), standard[2]) && 100 color_space_almost_equal(toXYZD50.getFloat(1, 0), standard[3]) && 101 color_space_almost_equal(toXYZD50.getFloat(1, 1), standard[4]) && 102 color_space_almost_equal(toXYZD50.getFloat(1, 2), standard[5]) && 103 color_space_almost_equal(toXYZD50.getFloat(2, 0), standard[6]) && 104 color_space_almost_equal(toXYZD50.getFloat(2, 1), standard[7]) && 105 color_space_almost_equal(toXYZD50.getFloat(2, 2), standard[8]) && 106 color_space_almost_equal(toXYZD50.getFloat(0, 3), 0.0f) && 107 color_space_almost_equal(toXYZD50.getFloat(1, 3), 0.0f) && 108 color_space_almost_equal(toXYZD50.getFloat(2, 3), 0.0f) && 109 color_space_almost_equal(toXYZD50.getFloat(3, 0), 0.0f) && 110 color_space_almost_equal(toXYZD50.getFloat(3, 1), 0.0f) && 111 color_space_almost_equal(toXYZD50.getFloat(3, 2), 0.0f) && 112 color_space_almost_equal(toXYZD50.getFloat(3, 3), 1.0f); 113} 114 115sk_sp<SkColorSpace> SkColorSpace_Base::MakeRGB(SkGammaNamed gammaNamed, const SkMatrix44& toXYZD50) 116{ 117 switch (gammaNamed) { 118 case kSRGB_SkGammaNamed: 119 if (xyz_almost_equal(toXYZD50, gSRGB_toXYZD50)) { 120 return SkColorSpace_Base::MakeNamed(kSRGB_Named); 121 } 122 break; 123 case k2Dot2Curve_SkGammaNamed: 124 if (xyz_almost_equal(toXYZD50, gAdobeRGB_toXYZD50)) { 125 return SkColorSpace_Base::MakeNamed(kAdobeRGB_Named); 126 } 127 break; 128 case kLinear_SkGammaNamed: 129 if (xyz_almost_equal(toXYZD50, gSRGB_toXYZD50)) { 130 return SkColorSpace_Base::MakeNamed(kSRGBLinear_Named); 131 } 132 break; 133 case kNonStandard_SkGammaNamed: 134 // This is not allowed. 135 return nullptr; 136 default: 137 break; 138 } 139 140 return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(gammaNamed, toXYZD50)); 141} 142 143sk_sp<SkColorSpace> SkColorSpace::MakeRGB(RenderTargetGamma gamma, const SkMatrix44& toXYZD50) { 144 switch (gamma) { 145 case kLinear_RenderTargetGamma: 146 return SkColorSpace_Base::MakeRGB(kLinear_SkGammaNamed, toXYZD50); 147 case kSRGB_RenderTargetGamma: 148 return SkColorSpace_Base::MakeRGB(kSRGB_SkGammaNamed, toXYZD50); 149 default: 150 return nullptr; 151 } 152} 153 154sk_sp<SkColorSpace> SkColorSpace::MakeRGB(const SkColorSpaceTransferFn& coeffs, 155 const SkMatrix44& toXYZD50) { 156 if (!is_valid_transfer_fn(coeffs)) { 157 return nullptr; 158 } 159 160 if (is_almost_srgb(coeffs)) { 161 return SkColorSpace::MakeRGB(kSRGB_RenderTargetGamma, toXYZD50); 162 } 163 164 if (is_almost_2dot2(coeffs)) { 165 return SkColorSpace_Base::MakeRGB(k2Dot2Curve_SkGammaNamed, toXYZD50); 166 } 167 168 if (is_almost_linear(coeffs)) { 169 return SkColorSpace_Base::MakeRGB(kLinear_SkGammaNamed, toXYZD50); 170 } 171 172 void* memory = sk_malloc_throw(sizeof(SkGammas) + sizeof(SkColorSpaceTransferFn)); 173 sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas(3)); 174 SkColorSpaceTransferFn* fn = SkTAddOffset<SkColorSpaceTransferFn>(memory, sizeof(SkGammas)); 175 *fn = coeffs; 176 SkGammas::Data data; 177 data.fParamOffset = 0; 178 for (int channel = 0; channel < 3; ++channel) { 179 gammas->fType[channel] = SkGammas::Type::kParam_Type; 180 gammas->fData[channel] = data; 181 } 182 return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(kNonStandard_SkGammaNamed, 183 std::move(gammas), toXYZD50, nullptr)); 184} 185 186sk_sp<SkColorSpace> SkColorSpace::MakeRGB(RenderTargetGamma gamma, Gamut gamut) { 187 SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor); 188 to_xyz_d50(&toXYZD50, gamut); 189 return SkColorSpace::MakeRGB(gamma, toXYZD50); 190} 191 192sk_sp<SkColorSpace> SkColorSpace::MakeRGB(const SkColorSpaceTransferFn& coeffs, Gamut gamut) { 193 SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor); 194 to_xyz_d50(&toXYZD50, gamut); 195 return SkColorSpace::MakeRGB(coeffs, toXYZD50); 196} 197 198static SkColorSpace* gAdobeRGB; 199static SkColorSpace* gSRGB; 200static SkColorSpace* gSRGBLinear; 201 202#ifdef SK_USE_LEGACY_NAMED_COLOR_SPACE 203sk_sp<SkColorSpace> SkColorSpace::MakeNamed(Named named) { 204 return SkColorSpace_Base::MakeNamed((SkColorSpace_Base::Named) named); 205} 206#endif 207 208sk_sp<SkColorSpace> SkColorSpace_Base::MakeNamed(Named named) { 209 static SkOnce sRGBOnce; 210 static SkOnce adobeRGBOnce; 211 static SkOnce sRGBLinearOnce; 212 213 switch (named) { 214 case kSRGB_Named: { 215 sRGBOnce([] { 216 SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor); 217 srgbToxyzD50.set3x3RowMajorf(gSRGB_toXYZD50); 218 219 // Force the mutable type mask to be computed. This avoids races. 220 (void)srgbToxyzD50.getType(); 221 gSRGB = new SkColorSpace_XYZ(kSRGB_SkGammaNamed, srgbToxyzD50); 222 }); 223 return sk_ref_sp<SkColorSpace>(gSRGB); 224 } 225 case kAdobeRGB_Named: { 226 adobeRGBOnce([] { 227 SkMatrix44 adobergbToxyzD50(SkMatrix44::kUninitialized_Constructor); 228 adobergbToxyzD50.set3x3RowMajorf(gAdobeRGB_toXYZD50); 229 230 // Force the mutable type mask to be computed. This avoids races. 231 (void)adobergbToxyzD50.getType(); 232 gAdobeRGB = new SkColorSpace_XYZ(k2Dot2Curve_SkGammaNamed, adobergbToxyzD50); 233 }); 234 return sk_ref_sp<SkColorSpace>(gAdobeRGB); 235 } 236 case kSRGBLinear_Named: { 237 sRGBLinearOnce([] { 238 SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor); 239 srgbToxyzD50.set3x3RowMajorf(gSRGB_toXYZD50); 240 241 // Force the mutable type mask to be computed. This avoids races. 242 (void)srgbToxyzD50.getType(); 243 gSRGBLinear = new SkColorSpace_XYZ(kLinear_SkGammaNamed, srgbToxyzD50); 244 }); 245 return sk_ref_sp<SkColorSpace>(gSRGBLinear); 246 } 247 default: 248 break; 249 } 250 return nullptr; 251} 252 253sk_sp<SkColorSpace> SkColorSpace::MakeSRGB() { 254 return SkColorSpace_Base::MakeNamed(SkColorSpace_Base::kSRGB_Named); 255} 256 257sk_sp<SkColorSpace> SkColorSpace::MakeSRGBLinear() { 258 return SkColorSpace_Base::MakeNamed(SkColorSpace_Base::kSRGBLinear_Named); 259} 260 261/////////////////////////////////////////////////////////////////////////////////////////////////// 262 263bool SkColorSpace::gammaCloseToSRGB() const { 264 return as_CSB(this)->onGammaCloseToSRGB(); 265} 266 267bool SkColorSpace::gammaIsLinear() const { 268 return as_CSB(this)->onGammaIsLinear(); 269} 270 271bool SkColorSpace::toXYZD50(SkMatrix44* toXYZD50) const { 272 const SkMatrix44* matrix = as_CSB(this)->toXYZD50(); 273 if (matrix) { 274 *toXYZD50 = *matrix; 275 return true; 276 } 277 278 return false; 279} 280 281/////////////////////////////////////////////////////////////////////////////////////////////////// 282 283enum Version { 284 k0_Version, // Initial version, header + flags for matrix and profile 285}; 286 287struct ColorSpaceHeader { 288 /** 289 * It is only valid to set zero or one flags. 290 * Setting multiple flags is invalid. 291 */ 292 293 /** 294 * If kMatrix_Flag is set, we will write 12 floats after the header. 295 */ 296 static constexpr uint8_t kMatrix_Flag = 1 << 0; 297 298 /** 299 * If kICC_Flag is set, we will write an ICC profile after the header. 300 * The ICC profile will be written as a uint32 size, followed immediately 301 * by the data (padded to 4 bytes). 302 */ 303 static constexpr uint8_t kICC_Flag = 1 << 1; 304 305 /** 306 * If kTransferFn_Flag is set, we will write 19 floats after the header. 307 * The first seven represent the transfer fn, and the next twelve are the 308 * matrix. 309 */ 310 static constexpr uint8_t kTransferFn_Flag = 1 << 3; 311 312 static ColorSpaceHeader Pack(Version version, uint8_t named, uint8_t gammaNamed, uint8_t flags) 313 { 314 ColorSpaceHeader header; 315 316 SkASSERT(k0_Version == version); 317 header.fVersion = (uint8_t) version; 318 319 SkASSERT(named <= SkColorSpace_Base::kSRGBLinear_Named); 320 header.fNamed = (uint8_t) named; 321 322 SkASSERT(gammaNamed <= kNonStandard_SkGammaNamed); 323 header.fGammaNamed = (uint8_t) gammaNamed; 324 325 SkASSERT(flags <= kTransferFn_Flag); 326 header.fFlags = flags; 327 return header; 328 } 329 330 uint8_t fVersion; // Always zero 331 uint8_t fNamed; // Must be a SkColorSpace::Named 332 uint8_t fGammaNamed; // Must be a SkGammaNamed 333 uint8_t fFlags; // Some combination of the flags listed above 334}; 335 336size_t SkColorSpace::writeToMemory(void* memory) const { 337 // Start by trying the serialization fast path. If we haven't saved ICC profile data, 338 // we must have a profile that we can serialize easily. 339 if (!as_CSB(this)->fProfileData) { 340 // Profile data is mandatory for A2B0 color spaces. 341 SkASSERT(SkColorSpace_Base::Type::kXYZ == as_CSB(this)->type()); 342 const SkColorSpace_XYZ* thisXYZ = static_cast<const SkColorSpace_XYZ*>(this); 343 // If we have a named profile, only write the enum. 344 const SkGammaNamed gammaNamed = thisXYZ->gammaNamed(); 345 if (this == gSRGB) { 346 if (memory) { 347 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack( 348 k0_Version, SkColorSpace_Base::kSRGB_Named, gammaNamed, 0); 349 } 350 return sizeof(ColorSpaceHeader); 351 } else if (this == gAdobeRGB) { 352 if (memory) { 353 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack( 354 k0_Version, SkColorSpace_Base::kAdobeRGB_Named, gammaNamed, 0); 355 } 356 return sizeof(ColorSpaceHeader); 357 } else if (this == gSRGBLinear) { 358 if (memory) { 359 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack( 360 k0_Version, SkColorSpace_Base::kSRGBLinear_Named, gammaNamed, 0); 361 } 362 return sizeof(ColorSpaceHeader); 363 } 364 365 // If we have a named gamma, write the enum and the matrix. 366 switch (gammaNamed) { 367 case kSRGB_SkGammaNamed: 368 case k2Dot2Curve_SkGammaNamed: 369 case kLinear_SkGammaNamed: { 370 if (memory) { 371 *((ColorSpaceHeader*) memory) = 372 ColorSpaceHeader::Pack(k0_Version, 0, gammaNamed, 373 ColorSpaceHeader::kMatrix_Flag); 374 memory = SkTAddOffset<void>(memory, sizeof(ColorSpaceHeader)); 375 thisXYZ->toXYZD50()->as3x4RowMajorf((float*) memory); 376 } 377 return sizeof(ColorSpaceHeader) + 12 * sizeof(float); 378 } 379 default: { 380 const SkGammas* gammas = thisXYZ->gammas(); 381 SkASSERT(gammas); 382 SkASSERT(gammas->isParametric(0)); 383 SkASSERT(gammas->isParametric(1)); 384 SkASSERT(gammas->isParametric(2)); 385 SkASSERT(gammas->data(0) == gammas->data(1)); 386 SkASSERT(gammas->data(0) == gammas->data(2)); 387 388 if (memory) { 389 *((ColorSpaceHeader*) memory) = 390 ColorSpaceHeader::Pack(k0_Version, 0, thisXYZ->fGammaNamed, 391 ColorSpaceHeader::kTransferFn_Flag); 392 memory = SkTAddOffset<void>(memory, sizeof(ColorSpaceHeader)); 393 394 *(((float*) memory) + 0) = gammas->params(0).fA; 395 *(((float*) memory) + 1) = gammas->params(0).fB; 396 *(((float*) memory) + 2) = gammas->params(0).fC; 397 *(((float*) memory) + 3) = gammas->params(0).fD; 398 *(((float*) memory) + 4) = gammas->params(0).fE; 399 *(((float*) memory) + 5) = gammas->params(0).fF; 400 *(((float*) memory) + 6) = gammas->params(0).fG; 401 memory = SkTAddOffset<void>(memory, 7 * sizeof(float)); 402 403 thisXYZ->fToXYZD50.as3x4RowMajorf((float*) memory); 404 } 405 406 return sizeof(ColorSpaceHeader) + 19 * sizeof(float); 407 } 408 } 409 } 410 411 // Otherwise, serialize the ICC data. 412 size_t profileSize = as_CSB(this)->fProfileData->size(); 413 if (SkAlign4(profileSize) != (uint32_t) SkAlign4(profileSize)) { 414 return 0; 415 } 416 417 if (memory) { 418 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack(k0_Version, 0, 419 kNonStandard_SkGammaNamed, 420 ColorSpaceHeader::kICC_Flag); 421 memory = SkTAddOffset<void>(memory, sizeof(ColorSpaceHeader)); 422 423 *((uint32_t*) memory) = (uint32_t) SkAlign4(profileSize); 424 memory = SkTAddOffset<void>(memory, sizeof(uint32_t)); 425 426 memcpy(memory, as_CSB(this)->fProfileData->data(), profileSize); 427 memset(SkTAddOffset<void>(memory, profileSize), 0, SkAlign4(profileSize) - profileSize); 428 } 429 return sizeof(ColorSpaceHeader) + sizeof(uint32_t) + SkAlign4(profileSize); 430} 431 432sk_sp<SkData> SkColorSpace::serialize() const { 433 size_t size = this->writeToMemory(nullptr); 434 if (0 == size) { 435 return nullptr; 436 } 437 438 sk_sp<SkData> data = SkData::MakeUninitialized(size); 439 this->writeToMemory(data->writable_data()); 440 return data; 441} 442 443sk_sp<SkColorSpace> SkColorSpace::Deserialize(const void* data, size_t length) { 444 if (length < sizeof(ColorSpaceHeader)) { 445 return nullptr; 446 } 447 448 ColorSpaceHeader header = *((const ColorSpaceHeader*) data); 449 data = SkTAddOffset<const void>(data, sizeof(ColorSpaceHeader)); 450 length -= sizeof(ColorSpaceHeader); 451 if (0 == header.fFlags) { 452 return SkColorSpace_Base::MakeNamed((SkColorSpace_Base::Named) header.fNamed); 453 } 454 455 switch ((SkGammaNamed) header.fGammaNamed) { 456 case kSRGB_SkGammaNamed: 457 case k2Dot2Curve_SkGammaNamed: 458 case kLinear_SkGammaNamed: { 459 if (ColorSpaceHeader::kMatrix_Flag != header.fFlags || length < 12 * sizeof(float)) { 460 return nullptr; 461 } 462 463 SkMatrix44 toXYZ(SkMatrix44::kUninitialized_Constructor); 464 toXYZ.set3x4RowMajorf((const float*) data); 465 return SkColorSpace_Base::MakeRGB((SkGammaNamed) header.fGammaNamed, toXYZ); 466 } 467 default: 468 break; 469 } 470 471 switch (header.fFlags) { 472 case ColorSpaceHeader::kICC_Flag: { 473 if (length < sizeof(uint32_t)) { 474 return nullptr; 475 } 476 477 uint32_t profileSize = *((uint32_t*) data); 478 data = SkTAddOffset<const void>(data, sizeof(uint32_t)); 479 length -= sizeof(uint32_t); 480 if (length < profileSize) { 481 return nullptr; 482 } 483 484 return MakeICC(data, profileSize); 485 } 486 case ColorSpaceHeader::kTransferFn_Flag: { 487 if (length < 19 * sizeof(float)) { 488 return nullptr; 489 } 490 491 SkColorSpaceTransferFn transferFn; 492 transferFn.fA = *(((const float*) data) + 0); 493 transferFn.fB = *(((const float*) data) + 1); 494 transferFn.fC = *(((const float*) data) + 2); 495 transferFn.fD = *(((const float*) data) + 3); 496 transferFn.fE = *(((const float*) data) + 4); 497 transferFn.fF = *(((const float*) data) + 5); 498 transferFn.fG = *(((const float*) data) + 6); 499 data = SkTAddOffset<const void>(data, 7 * sizeof(float)); 500 501 SkMatrix44 toXYZ(SkMatrix44::kUninitialized_Constructor); 502 toXYZ.set3x4RowMajorf((const float*) data); 503 return SkColorSpace::MakeRGB(transferFn, toXYZ); 504 } 505 default: 506 return nullptr; 507 } 508} 509 510bool SkColorSpace::Equals(const SkColorSpace* src, const SkColorSpace* dst) { 511 if (src == dst) { 512 return true; 513 } 514 515 if (!src || !dst) { 516 return false; 517 } 518 519 SkData* srcData = as_CSB(src)->fProfileData.get(); 520 SkData* dstData = as_CSB(dst)->fProfileData.get(); 521 if (srcData || dstData) { 522 if (srcData && dstData) { 523 return srcData->size() == dstData->size() && 524 0 == memcmp(srcData->data(), dstData->data(), srcData->size()); 525 } 526 527 return false; 528 } 529 530 // profiles are mandatory for A2B0 color spaces 531 SkASSERT(as_CSB(src)->type() == SkColorSpace_Base::Type::kXYZ); 532 const SkColorSpace_XYZ* srcXYZ = static_cast<const SkColorSpace_XYZ*>(src); 533 const SkColorSpace_XYZ* dstXYZ = static_cast<const SkColorSpace_XYZ*>(dst); 534 535 if (srcXYZ->gammaNamed() != dstXYZ->gammaNamed()) { 536 return false; 537 } 538 539 switch (srcXYZ->gammaNamed()) { 540 case kSRGB_SkGammaNamed: 541 case k2Dot2Curve_SkGammaNamed: 542 case kLinear_SkGammaNamed: 543 if (srcXYZ->toXYZD50Hash() == dstXYZ->toXYZD50Hash()) { 544 SkASSERT(*srcXYZ->toXYZD50() == *dstXYZ->toXYZD50() && "Hash collision"); 545 return true; 546 } 547 return false; 548 default: 549 // It is unlikely that we will reach this case. 550 sk_sp<SkData> serializedSrcData = src->serialize(); 551 sk_sp<SkData> serializedDstData = dst->serialize(); 552 return serializedSrcData->size() == serializedDstData->size() && 553 0 == memcmp(serializedSrcData->data(), serializedDstData->data(), 554 serializedSrcData->size()); 555 } 556} 557