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1 /* | 1 /* |
2 * Copyright 2016 Google Inc. | 2 * Copyright 2016 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkAtomics.h" | 8 #include "SkAtomics.h" |
9 #include "SkColorSpace.h" | 9 #include "SkColorSpace.h" |
10 | 10 |
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175 #define return_null(msg) \ | 175 #define return_null(msg) \ |
176 do { \ | 176 do { \ |
177 SkColorSpacePrintf("Invalid ICC Profile: %s.\n", (msg)); \ | 177 SkColorSpacePrintf("Invalid ICC Profile: %s.\n", (msg)); \ |
178 return nullptr; \ | 178 return nullptr; \ |
179 } while (0) | 179 } while (0) |
180 | 180 |
181 static uint16_t read_big_endian_short(const uint8_t* ptr) { | 181 static uint16_t read_big_endian_short(const uint8_t* ptr) { |
182 return ptr[0] << 8 | ptr[1]; | 182 return ptr[0] << 8 | ptr[1]; |
183 } | 183 } |
184 | 184 |
185 static uint32_t read_big_endian_int(const uint8_t* ptr) { | 185 static uint32_t read_big_endian_uint(const uint8_t* ptr) { |
186 return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3]; | 186 return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3]; |
187 } | 187 } |
188 | 188 |
189 static int32_t read_big_endian_int(const uint8_t* ptr) { | |
190 return (int32_t) read_big_endian_uint(ptr); | |
191 } | |
192 | |
193 static bool color_space_almost_equal(float a, float b) { | |
194 return SkTAbs(a - b) < 0.01f; | |
195 } | |
196 | |
189 // This is equal to the header size according to the ICC specification (128) | 197 // This is equal to the header size according to the ICC specification (128) |
190 // plus the size of the tag count (4). We include the tag count since we | 198 // plus the size of the tag count (4). We include the tag count since we |
191 // always require it to be present anyway. | 199 // always require it to be present anyway. |
192 static const size_t kICCHeaderSize = 132; | 200 static const size_t kICCHeaderSize = 132; |
193 | 201 |
194 // Contains a signature (4), offset (4), and size (4). | 202 // Contains a signature (4), offset (4), and size (4). |
195 static const size_t kICCTagTableEntrySize = 12; | 203 static const size_t kICCTagTableEntrySize = 12; |
196 | 204 |
197 static const uint32_t kRGB_ColorSpace = SkSetFourByteTag('R', 'G', 'B', ' '); | 205 static const uint32_t kRGB_ColorSpace = SkSetFourByteTag('R', 'G', 'B', ' '); |
198 static const uint32_t kGray_ColorSpace = SkSetFourByteTag('G', 'R', 'A', 'Y'); | |
199 | 206 |
200 struct ICCProfileHeader { | 207 struct ICCProfileHeader { |
201 // TODO (msarett): | |
202 // Can we ignore less of these fields? | |
203 uint32_t fSize; | 208 uint32_t fSize; |
209 | |
210 // No reason to care about the preferred color management module (ex: Adobe, Apple, etc.). | |
211 // We're always going to use this one. | |
204 uint32_t fCMMType_ignored; | 212 uint32_t fCMMType_ignored; |
213 | |
205 uint32_t fVersion; | 214 uint32_t fVersion; |
206 uint32_t fClassProfile; | 215 uint32_t fProfileClass; |
207 uint32_t fColorSpace; | 216 uint32_t fInputColorSpace; |
208 uint32_t fPCS; | 217 uint32_t fPCS; |
209 uint32_t fDateTime_ignored[3]; | 218 uint32_t fDateTime_ignored[3]; |
210 uint32_t fSignature; | 219 uint32_t fSignature; |
220 | |
221 // Indicates the platform that this profile was created for (ex: Apple, Micr osoft). This | |
222 // doesn't really matter to us. | |
211 uint32_t fPlatformTarget_ignored; | 223 uint32_t fPlatformTarget_ignored; |
224 | |
225 // Flags can indicate: | |
226 // (1) Whether this profile was embedded in a file. This flag is consistent ly wrong. | |
227 // Ex: The profile came from a file but indicates that it did not. | |
228 // (2) Whether we are allowed to use the profile independently of the color data. If set, | |
229 // this may allow us to use the embedded profile for testing separate fr om the original | |
230 // image. | |
212 uint32_t fFlags_ignored; | 231 uint32_t fFlags_ignored; |
213 uint32_t fManufacturer_ignored; | 232 |
233 // We support many output devices. It doesn't make sense to think about the attributes of | |
234 // the device in the context of the image profile. | |
235 uint32_t fDeviceManufacturer_ignored; | |
214 uint32_t fDeviceModel_ignored; | 236 uint32_t fDeviceModel_ignored; |
215 uint32_t fDeviceAttributes_ignored[2]; | 237 uint32_t fDeviceAttributes_ignored[2]; |
238 | |
216 uint32_t fRenderingIntent; | 239 uint32_t fRenderingIntent; |
217 uint32_t fIlluminantXYZ_ignored[3]; | 240 int32_t fIlluminantXYZ[3]; |
241 | |
242 // We don't care who created the profile. | |
218 uint32_t fCreator_ignored; | 243 uint32_t fCreator_ignored; |
244 | |
245 // This is an MD5 checksum. Could be useful for checking if profiles are eq ual. | |
219 uint32_t fProfileId_ignored[4]; | 246 uint32_t fProfileId_ignored[4]; |
247 | |
248 // Reserved for future use. | |
220 uint32_t fReserved_ignored[7]; | 249 uint32_t fReserved_ignored[7]; |
250 | |
221 uint32_t fTagCount; | 251 uint32_t fTagCount; |
222 | 252 |
223 void init(const uint8_t* src, size_t len) { | 253 void init(const uint8_t* src, size_t len) { |
224 SkASSERT(kICCHeaderSize == sizeof(*this)); | 254 SkASSERT(kICCHeaderSize == sizeof(*this)); |
225 | 255 |
226 uint32_t* dst = (uint32_t*) this; | 256 uint32_t* dst = (uint32_t*) this; |
227 for (uint32_t i = 0; i < kICCHeaderSize / 4; i++, src+=4) { | 257 for (uint32_t i = 0; i < kICCHeaderSize / 4; i++, src+=4) { |
228 dst[i] = read_big_endian_int(src); | 258 dst[i] = read_big_endian_uint(src); |
229 } | 259 } |
230 } | 260 } |
231 | 261 |
232 bool valid() const { | 262 bool valid() const { |
233 // TODO (msarett): | |
234 // For now it's nice to fail loudly on invalid inputs. But, can we | |
235 // recover from some of these errors? | |
236 | |
237 return_if_false(fSize >= kICCHeaderSize, "Size is too small"); | 263 return_if_false(fSize >= kICCHeaderSize, "Size is too small"); |
238 | 264 |
239 uint8_t majorVersion = fVersion >> 24; | 265 uint8_t majorVersion = fVersion >> 24; |
240 return_if_false(majorVersion <= 4, "Unsupported version"); | 266 return_if_false(majorVersion <= 4, "Unsupported version"); |
241 | 267 |
268 // These are the three basic classes of profiles that we might expect to see embedded | |
269 // in images. Four additional classes exist, but they generally are use d as a convenient | |
270 // way for CMMs to store calculated transforms. | |
242 const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r'); | 271 const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r'); |
243 const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r'); | 272 const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r'); |
244 const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r'); | 273 const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r'); |
245 // TODO (msarett): | 274 return_if_false(fProfileClass == kDisplay_Profile || |
246 // Should we also support DeviceLink, ColorSpace, Abstract, or NamedColo r? | 275 fProfileClass == kInput_Profile || |
247 return_if_false(fClassProfile == kDisplay_Profile || | 276 fProfileClass == kOutput_Profile, |
248 fClassProfile == kInput_Profile || | 277 "Unsupported profile"); |
249 fClassProfile == kOutput_Profile, | |
250 "Unsupported class profile"); | |
251 | 278 |
252 // TODO (msarett): | 279 // TODO (msarett): |
253 // There are many more color spaces that we could try to support. | 280 // All the profiles we've tested so far use RGB as the input color space . |
254 return_if_false(fColorSpace == kRGB_ColorSpace || fColorSpace == kGray_C olorSpace, | 281 return_if_false(fInputColorSpace == kRGB_ColorSpace, "Unsupported color space"); |
255 "Unsupported color space"); | |
256 | 282 |
283 // TODO (msarett): | |
284 // All the profiles we've tested so far use XYZ as the profile connectio n space. | |
257 const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' '); | 285 const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' '); |
258 // TODO (msarett): | |
259 // Can we support PCS LAB as well? | |
260 return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space"); | 286 return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space"); |
261 | 287 |
262 return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature"); | 288 return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature"); |
263 | 289 |
264 // TODO (msarett): | 290 // TODO (msarett): |
265 // Should we treat different rendering intents differently? | 291 // Should we treat different rendering intents differently? |
266 // Valid rendering intents include kPerceptual (0), kRelative (1), | 292 // Valid rendering intents include kPerceptual (0), kRelative (1), |
267 // kSaturation (2), and kAbsolute (3). | 293 // kSaturation (2), and kAbsolute (3). |
268 return_if_false(fRenderingIntent <= 3, "Bad rendering intent"); | 294 return_if_false(fRenderingIntent <= 3, "Bad rendering intent"); |
269 | 295 |
296 return_if_false(color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[0 ]), 0.96420f) && | |
297 color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[1 ]), 1.00000f) && | |
298 color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[2 ]), 0.82491f), | |
299 "Illuminant must be D50"); | |
scroggo
2016/04/27 11:55:44
Was this intended to be more flexible in future ve
msarett
2016/04/27 13:11:19
I don't know... It doesn't look like they are hea
| |
300 | |
270 return_if_false(fTagCount <= 100, "Too many tags"); | 301 return_if_false(fTagCount <= 100, "Too many tags"); |
271 | 302 |
272 return true; | 303 return true; |
273 } | 304 } |
274 }; | 305 }; |
275 | 306 |
276 struct ICCTag { | 307 struct ICCTag { |
277 uint32_t fSignature; | 308 uint32_t fSignature; |
278 uint32_t fOffset; | 309 uint32_t fOffset; |
279 uint32_t fLength; | 310 uint32_t fLength; |
280 | 311 |
281 const uint8_t* init(const uint8_t* src) { | 312 const uint8_t* init(const uint8_t* src) { |
282 fSignature = read_big_endian_int(src); | 313 fSignature = read_big_endian_uint(src); |
283 fOffset = read_big_endian_int(src + 4); | 314 fOffset = read_big_endian_uint(src + 4); |
284 fLength = read_big_endian_int(src + 8); | 315 fLength = read_big_endian_uint(src + 8); |
285 return src + 12; | 316 return src + 12; |
286 } | 317 } |
287 | 318 |
288 bool valid(size_t len) { | 319 bool valid(size_t len) { |
289 return_if_false(fOffset + fLength <= len, "Tag too large for ICC profile "); | 320 return_if_false(fOffset + fLength <= len, "Tag too large for ICC profile "); |
290 return true; | 321 return true; |
291 } | 322 } |
292 | 323 |
293 const uint8_t* addr(const uint8_t* src) const { | 324 const uint8_t* addr(const uint8_t* src) const { |
294 return src + fOffset; | 325 return src + fOffset; |
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328 | 359 |
329 static const uint32_t kTAG_CurveType = SkSetFourByteTag('c', 'u', 'r', 'v'); | 360 static const uint32_t kTAG_CurveType = SkSetFourByteTag('c', 'u', 'r', 'v'); |
330 static const uint32_t kTAG_ParaCurveType = SkSetFourByteTag('p', 'a', 'r', 'a'); | 361 static const uint32_t kTAG_ParaCurveType = SkSetFourByteTag('p', 'a', 'r', 'a'); |
331 | 362 |
332 static bool load_gamma(float* gamma, const uint8_t* src, size_t len) { | 363 static bool load_gamma(float* gamma, const uint8_t* src, size_t len) { |
333 if (len < 14) { | 364 if (len < 14) { |
334 SkColorSpacePrintf("gamma tag is too small (%d bytes)", len); | 365 SkColorSpacePrintf("gamma tag is too small (%d bytes)", len); |
335 return false; | 366 return false; |
336 } | 367 } |
337 | 368 |
338 uint32_t type = read_big_endian_int(src); | 369 uint32_t type = read_big_endian_uint(src); |
339 switch (type) { | 370 switch (type) { |
340 case kTAG_CurveType: { | 371 case kTAG_CurveType: { |
341 uint32_t count = read_big_endian_int(src + 8); | 372 uint32_t count = read_big_endian_int(src + 8); |
342 if (0 == count) { | 373 if (0 == count) { |
343 return false; | 374 return false; |
344 } | 375 } |
345 | 376 |
346 const uint16_t* table = (const uint16_t*) (src + 12); | 377 const uint16_t* table = (const uint16_t*) (src + 12); |
347 if (1 == count) { | 378 if (1 == count) { |
348 // Table entry is the exponent (bias 256). | 379 // Table entry is the exponent (bias 256). |
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417 (tags[i].fSignature >> 0) & 0xFF, tags[i].fOffset, tags[i].fLen gth); | 448 (tags[i].fSignature >> 0) & 0xFF, tags[i].fOffset, tags[i].fLen gth); |
418 | 449 |
419 if (!tags[i].valid(kICCHeaderSize + len)) { | 450 if (!tags[i].valid(kICCHeaderSize + len)) { |
420 return_null("Tag is too large to fit in ICC profile"); | 451 return_null("Tag is too large to fit in ICC profile"); |
421 } | 452 } |
422 } | 453 } |
423 | 454 |
424 // Load our XYZ and gamma matrices. | 455 // Load our XYZ and gamma matrices. |
425 SkFloat3x3 toXYZ; | 456 SkFloat3x3 toXYZ; |
426 SkFloat3 gamma {{ 1.0f, 1.0f, 1.0f }}; | 457 SkFloat3 gamma {{ 1.0f, 1.0f, 1.0f }}; |
427 switch (header.fColorSpace) { | 458 switch (header.fInputColorSpace) { |
428 case kRGB_ColorSpace: { | 459 case kRGB_ColorSpace: { |
429 const ICCTag* r = ICCTag::Find(tags.get(), tagCount, kTAG_rXYZ); | 460 const ICCTag* r = ICCTag::Find(tags.get(), tagCount, kTAG_rXYZ); |
430 const ICCTag* g = ICCTag::Find(tags.get(), tagCount, kTAG_gXYZ); | 461 const ICCTag* g = ICCTag::Find(tags.get(), tagCount, kTAG_gXYZ); |
431 const ICCTag* b = ICCTag::Find(tags.get(), tagCount, kTAG_bXYZ); | 462 const ICCTag* b = ICCTag::Find(tags.get(), tagCount, kTAG_bXYZ); |
432 if (!r || !g || !b) { | 463 if (!r || !g || !b) { |
433 return_null("Need rgb tags for XYZ space"); | 464 return_null("Need rgb tags for XYZ space"); |
434 } | 465 } |
435 | 466 |
436 if (!load_xyz(&toXYZ.fMat[0], r->addr((const uint8_t*) base), r->fLe ngth) || | 467 if (!load_xyz(&toXYZ.fMat[0], r->addr((const uint8_t*) base), r->fLe ngth) || |
437 !load_xyz(&toXYZ.fMat[3], g->addr((const uint8_t*) base), g->fLe ngth) || | 468 !load_xyz(&toXYZ.fMat[3], g->addr((const uint8_t*) base), g->fLe ngth) || |
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541 } | 572 } |
542 | 573 |
543 // D65 white point of Rec. 709 [8] are: | 574 // D65 white point of Rec. 709 [8] are: |
544 // | 575 // |
545 // D65 white-point in unit luminance XYZ = 0.9505, 1.0000, 1.0890 | 576 // D65 white-point in unit luminance XYZ = 0.9505, 1.0000, 1.0890 |
546 // | 577 // |
547 // R G B white | 578 // R G B white |
548 // x 0.640 0.300 0.150 0.3127 | 579 // x 0.640 0.300 0.150 0.3127 |
549 // y 0.330 0.600 0.060 0.3290 | 580 // y 0.330 0.600 0.060 0.3290 |
550 // z 0.030 0.100 0.790 0.3582 | 581 // z 0.030 0.100 0.790 0.3582 |
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