Line data Source code
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 "SkAutoMalloc.h"
9 : #include "SkColorSpace_Base.h"
10 : #include "SkColorSpace_XYZ.h"
11 : #include "SkColorSpacePriv.h"
12 : #include "SkColorSpaceXformPriv.h"
13 : #include "SkEndian.h"
14 : #include "SkFixed.h"
15 : #include "SkICC.h"
16 : #include "SkICCPriv.h"
17 :
18 0 : SkICC::SkICC(sk_sp<SkColorSpace> colorSpace)
19 0 : : fColorSpace(std::move(colorSpace))
20 0 : {}
21 :
22 0 : sk_sp<SkICC> SkICC::Make(const void* ptr, size_t len) {
23 0 : sk_sp<SkColorSpace> colorSpace = SkColorSpace::MakeICC(ptr, len);
24 0 : if (!colorSpace) {
25 0 : return nullptr;
26 : }
27 :
28 0 : return sk_sp<SkICC>(new SkICC(std::move(colorSpace)));
29 : }
30 :
31 0 : bool SkICC::toXYZD50(SkMatrix44* toXYZD50) const {
32 0 : const SkMatrix44* m = as_CSB(fColorSpace)->toXYZD50();
33 0 : if (!m) {
34 0 : return false;
35 : }
36 :
37 0 : *toXYZD50 = *m;
38 0 : return true;
39 : }
40 :
41 0 : bool SkICC::isNumericalTransferFn(SkColorSpaceTransferFn* coeffs) const {
42 0 : return as_CSB(fColorSpace)->onIsNumericalTransferFn(coeffs);
43 : }
44 :
45 : static const int kDefaultTableSize = 512; // Arbitrary
46 :
47 0 : void fn_to_table(float* tablePtr, const SkColorSpaceTransferFn& fn) {
48 : // Y = (aX + b)^g + e for X >= d
49 : // Y = cX + f otherwise
50 0 : for (int i = 0; i < kDefaultTableSize; i++) {
51 0 : float x = ((float) i) / ((float) (kDefaultTableSize - 1));
52 0 : if (x >= fn.fD) {
53 0 : tablePtr[i] = clamp_0_1(powf(fn.fA * x + fn.fB, fn.fG) + fn.fE);
54 : } else {
55 0 : tablePtr[i] = clamp_0_1(fn.fC * x + fn.fF);
56 : }
57 : }
58 0 : }
59 :
60 0 : void copy_to_table(float* tablePtr, const SkGammas* gammas, int index) {
61 0 : SkASSERT(gammas->isTable(index));
62 0 : const float* ptr = gammas->table(index);
63 0 : const size_t bytes = gammas->tableSize(index) * sizeof(float);
64 0 : memcpy(tablePtr, ptr, bytes);
65 0 : }
66 :
67 0 : bool SkICC::rawTransferFnData(Tables* tables) const {
68 0 : if (SkColorSpace_Base::Type::kA2B == as_CSB(fColorSpace)->type()) {
69 0 : return false;
70 : }
71 0 : SkColorSpace_XYZ* colorSpace = (SkColorSpace_XYZ*) fColorSpace.get();
72 :
73 : SkColorSpaceTransferFn fn;
74 0 : if (this->isNumericalTransferFn(&fn)) {
75 0 : tables->fStorage = SkData::MakeUninitialized(kDefaultTableSize * sizeof(float));
76 0 : fn_to_table((float*) tables->fStorage->writable_data(), fn);
77 0 : tables->fRed.fOffset = tables->fGreen.fOffset = tables->fBlue.fOffset = 0;
78 0 : tables->fRed.fCount = tables->fGreen.fCount = tables->fBlue.fCount = kDefaultTableSize;
79 0 : return true;
80 : }
81 :
82 0 : const SkGammas* gammas = colorSpace->gammas();
83 0 : SkASSERT(gammas);
84 0 : if (gammas->data(0) == gammas->data(1) && gammas->data(0) == gammas->data(2)) {
85 0 : SkASSERT(gammas->isTable(0));
86 0 : tables->fStorage = SkData::MakeUninitialized(gammas->tableSize(0) * sizeof(float));
87 0 : copy_to_table((float*) tables->fStorage->writable_data(), gammas, 0);
88 0 : tables->fRed.fOffset = tables->fGreen.fOffset = tables->fBlue.fOffset = 0;
89 0 : tables->fRed.fCount = tables->fGreen.fCount = tables->fBlue.fCount = gammas->tableSize(0);
90 0 : return true;
91 : }
92 :
93 : // Determine the storage size.
94 0 : size_t storageSize = 0;
95 0 : for (int i = 0; i < 3; i++) {
96 0 : if (gammas->isTable(i)) {
97 0 : storageSize += gammas->tableSize(i) * sizeof(float);
98 : } else {
99 0 : storageSize += kDefaultTableSize * sizeof(float);
100 : }
101 : }
102 :
103 : // Fill in the tables.
104 0 : tables->fStorage = SkData::MakeUninitialized(storageSize);
105 0 : float* ptr = (float*) tables->fStorage->writable_data();
106 0 : size_t offset = 0;
107 : Channel rgb[3];
108 0 : for (int i = 0; i < 3; i++) {
109 0 : if (gammas->isTable(i)) {
110 0 : copy_to_table(ptr, gammas, i);
111 0 : rgb[i].fOffset = offset;
112 0 : rgb[i].fCount = gammas->tableSize(i);
113 0 : offset += rgb[i].fCount * sizeof(float);
114 0 : ptr += rgb[i].fCount;
115 0 : continue;
116 : }
117 :
118 0 : if (gammas->isNamed(i)) {
119 0 : SkAssertResult(named_to_parametric(&fn, gammas->data(i).fNamed));
120 0 : } else if (gammas->isValue(i)) {
121 0 : value_to_parametric(&fn, gammas->data(i).fValue);
122 : } else {
123 0 : SkASSERT(gammas->isParametric(i));
124 0 : fn = gammas->params(i);
125 : }
126 :
127 0 : fn_to_table(ptr, fn);
128 0 : rgb[i].fOffset = offset;
129 0 : rgb[i].fCount = kDefaultTableSize;
130 0 : offset += kDefaultTableSize * sizeof(float);
131 0 : ptr += kDefaultTableSize;
132 : }
133 :
134 0 : tables->fRed = rgb[0];
135 0 : tables->fGreen = rgb[1];
136 0 : tables->fBlue = rgb[2];
137 0 : return true;
138 : }
139 :
140 : ///////////////////////////////////////////////////////////////////////////////////////////////////
141 :
142 : // Google Skia (UTF-16)
143 : static constexpr uint8_t kDescriptionTagBody[] = {
144 : 0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00,
145 : 0x53, 0x00, 0x6b, 0x00, 0x69, 0x00, 0x61, 0x00, 0x20,
146 : };
147 : static_assert(SkIsAlign4(sizeof(kDescriptionTagBody)), "Description must be aligned to 4-bytes.");
148 : static constexpr uint32_t kDescriptionTagHeader[7] {
149 : SkEndian_SwapBE32(kTAG_TextType), // Type signature
150 : 0, // Reserved
151 : SkEndian_SwapBE32(1), // Number of records
152 : SkEndian_SwapBE32(12), // Record size (must be 12)
153 : SkEndian_SwapBE32(SkSetFourByteTag('e', 'n', 'U', 'S')), // English USA
154 : SkEndian_SwapBE32(sizeof(kDescriptionTagBody)), // Length of string
155 : SkEndian_SwapBE32(28), // Offset of string
156 : };
157 :
158 : static constexpr uint32_t kWhitePointTag[5] {
159 : SkEndian_SwapBE32(kXYZ_PCSSpace),
160 : 0,
161 : SkEndian_SwapBE32(0x0000f6d6), // X = 0.96420 (D50)
162 : SkEndian_SwapBE32(0x00010000), // Y = 1.00000 (D50)
163 : SkEndian_SwapBE32(0x0000d32d), // Z = 0.82491 (D50)
164 : };
165 :
166 : // Google Inc. 2016 (UTF-16)
167 : static constexpr uint8_t kCopyrightTagBody[] = {
168 : 0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00,
169 : 0x49, 0x00, 0x6e, 0x00, 0x63, 0x00, 0x2e, 0x00, 0x20, 0x00, 0x32, 0x00, 0x30, 0x00, 0x31,
170 : 0x00, 0x36,
171 : };
172 : static_assert(SkIsAlign4(sizeof(kCopyrightTagBody)), "Copyright must be aligned to 4-bytes.");
173 : static constexpr uint32_t kCopyrightTagHeader[7] {
174 : SkEndian_SwapBE32(kTAG_TextType), // Type signature
175 : 0, // Reserved
176 : SkEndian_SwapBE32(1), // Number of records
177 : SkEndian_SwapBE32(12), // Record size (must be 12)
178 : SkEndian_SwapBE32(SkSetFourByteTag('e', 'n', 'U', 'S')), // English USA
179 : SkEndian_SwapBE32(sizeof(kCopyrightTagBody)), // Length of string
180 : SkEndian_SwapBE32(28), // Offset of string
181 : };
182 :
183 : // We will write a profile with the minimum nine required tags.
184 : static constexpr uint32_t kICCNumEntries = 9;
185 :
186 : static constexpr uint32_t kTAG_desc = SkSetFourByteTag('d', 'e', 's', 'c');
187 : static constexpr uint32_t kTAG_desc_Bytes = sizeof(kDescriptionTagHeader) +
188 : sizeof(kDescriptionTagBody);
189 : static constexpr uint32_t kTAG_desc_Offset = kICCHeaderSize +
190 : kICCNumEntries * kICCTagTableEntrySize;
191 :
192 : static constexpr uint32_t kTAG_XYZ_Bytes = 20;
193 : static constexpr uint32_t kTAG_rXYZ_Offset = kTAG_desc_Offset + kTAG_desc_Bytes;
194 : static constexpr uint32_t kTAG_gXYZ_Offset = kTAG_rXYZ_Offset + kTAG_XYZ_Bytes;
195 : static constexpr uint32_t kTAG_bXYZ_Offset = kTAG_gXYZ_Offset + kTAG_XYZ_Bytes;
196 :
197 : static constexpr uint32_t kTAG_TRC_Bytes = 40;
198 : static constexpr uint32_t kTAG_rTRC_Offset = kTAG_bXYZ_Offset + kTAG_XYZ_Bytes;
199 : static constexpr uint32_t kTAG_gTRC_Offset = kTAG_rTRC_Offset;
200 : static constexpr uint32_t kTAG_bTRC_Offset = kTAG_rTRC_Offset;
201 :
202 : static constexpr uint32_t kTAG_wtpt = SkSetFourByteTag('w', 't', 'p', 't');
203 : static constexpr uint32_t kTAG_wtpt_Offset = kTAG_bTRC_Offset + kTAG_TRC_Bytes;
204 :
205 : static constexpr uint32_t kTAG_cprt = SkSetFourByteTag('c', 'p', 'r', 't');
206 : static constexpr uint32_t kTAG_cprt_Bytes = sizeof(kCopyrightTagHeader) +
207 : sizeof(kCopyrightTagBody);
208 : static constexpr uint32_t kTAG_cprt_Offset = kTAG_wtpt_Offset + kTAG_XYZ_Bytes;
209 :
210 : static constexpr uint32_t kICCProfileSize = kTAG_cprt_Offset + kTAG_cprt_Bytes;
211 :
212 : static constexpr uint32_t kICCHeader[kICCHeaderSize / 4] {
213 : SkEndian_SwapBE32(kICCProfileSize), // Size of the profile
214 : 0, // Preferred CMM type (ignored)
215 : SkEndian_SwapBE32(0x02100000), // Version 2.1
216 : SkEndian_SwapBE32(kDisplay_Profile), // Display device profile
217 : SkEndian_SwapBE32(kRGB_ColorSpace), // RGB input color space
218 : SkEndian_SwapBE32(kXYZ_PCSSpace), // XYZ profile connection space
219 : 0, 0, 0, // Date and time (ignored)
220 : SkEndian_SwapBE32(kACSP_Signature), // Profile signature
221 : 0, // Platform target (ignored)
222 : 0x00000000, // Flags: not embedded, can be used independently
223 : 0, // Device manufacturer (ignored)
224 : 0, // Device model (ignored)
225 : 0, 0, // Device attributes (ignored)
226 : SkEndian_SwapBE32(1), // Relative colorimetric rendering intent
227 : SkEndian_SwapBE32(0x0000f6d6), // D50 standard illuminant (X)
228 : SkEndian_SwapBE32(0x00010000), // D50 standard illuminant (Y)
229 : SkEndian_SwapBE32(0x0000d32d), // D50 standard illuminant (Z)
230 : 0, // Profile creator (ignored)
231 : 0, 0, 0, 0, // Profile id checksum (ignored)
232 : 0, 0, 0, 0, 0, 0, 0, // Reserved (ignored)
233 : SkEndian_SwapBE32(kICCNumEntries), // Number of tags
234 : };
235 :
236 : static constexpr uint32_t kICCTagTable[3 * kICCNumEntries] {
237 : // Profile description
238 : SkEndian_SwapBE32(kTAG_desc),
239 : SkEndian_SwapBE32(kTAG_desc_Offset),
240 : SkEndian_SwapBE32(kTAG_desc_Bytes),
241 :
242 : // rXYZ
243 : SkEndian_SwapBE32(kTAG_rXYZ),
244 : SkEndian_SwapBE32(kTAG_rXYZ_Offset),
245 : SkEndian_SwapBE32(kTAG_XYZ_Bytes),
246 :
247 : // gXYZ
248 : SkEndian_SwapBE32(kTAG_gXYZ),
249 : SkEndian_SwapBE32(kTAG_gXYZ_Offset),
250 : SkEndian_SwapBE32(kTAG_XYZ_Bytes),
251 :
252 : // bXYZ
253 : SkEndian_SwapBE32(kTAG_bXYZ),
254 : SkEndian_SwapBE32(kTAG_bXYZ_Offset),
255 : SkEndian_SwapBE32(kTAG_XYZ_Bytes),
256 :
257 : // rTRC
258 : SkEndian_SwapBE32(kTAG_rTRC),
259 : SkEndian_SwapBE32(kTAG_rTRC_Offset),
260 : SkEndian_SwapBE32(kTAG_TRC_Bytes),
261 :
262 : // gTRC
263 : SkEndian_SwapBE32(kTAG_gTRC),
264 : SkEndian_SwapBE32(kTAG_gTRC_Offset),
265 : SkEndian_SwapBE32(kTAG_TRC_Bytes),
266 :
267 : // bTRC
268 : SkEndian_SwapBE32(kTAG_bTRC),
269 : SkEndian_SwapBE32(kTAG_bTRC_Offset),
270 : SkEndian_SwapBE32(kTAG_TRC_Bytes),
271 :
272 : // White point
273 : SkEndian_SwapBE32(kTAG_wtpt),
274 : SkEndian_SwapBE32(kTAG_wtpt_Offset),
275 : SkEndian_SwapBE32(kTAG_XYZ_Bytes),
276 :
277 : // Copyright
278 : SkEndian_SwapBE32(kTAG_cprt),
279 : SkEndian_SwapBE32(kTAG_cprt_Offset),
280 : SkEndian_SwapBE32(kTAG_cprt_Bytes),
281 : };
282 :
283 0 : static void write_xyz_tag(uint32_t* ptr, const SkMatrix44& toXYZ, int col) {
284 0 : ptr[0] = SkEndian_SwapBE32(kXYZ_PCSSpace);
285 0 : ptr[1] = 0;
286 0 : ptr[2] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(0, col)));
287 0 : ptr[3] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(1, col)));
288 0 : ptr[4] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(2, col)));
289 0 : }
290 :
291 0 : static void write_trc_tag(uint32_t* ptr, const SkColorSpaceTransferFn& fn) {
292 0 : ptr[0] = SkEndian_SwapBE32(kTAG_ParaCurveType);
293 0 : ptr[1] = 0;
294 0 : ptr[2] = (uint32_t) (SkEndian_SwapBE16(kGABCDEF_ParaCurveType));
295 0 : ptr[3] = SkEndian_SwapBE32(SkFloatToFixed(fn.fG));
296 0 : ptr[4] = SkEndian_SwapBE32(SkFloatToFixed(fn.fA));
297 0 : ptr[5] = SkEndian_SwapBE32(SkFloatToFixed(fn.fB));
298 0 : ptr[6] = SkEndian_SwapBE32(SkFloatToFixed(fn.fC));
299 0 : ptr[7] = SkEndian_SwapBE32(SkFloatToFixed(fn.fD));
300 0 : ptr[8] = SkEndian_SwapBE32(SkFloatToFixed(fn.fE));
301 0 : ptr[9] = SkEndian_SwapBE32(SkFloatToFixed(fn.fF));
302 0 : }
303 :
304 0 : static bool is_3x3(const SkMatrix44& toXYZD50) {
305 0 : return 0.0f == toXYZD50.get(3, 0) && 0.0f == toXYZD50.get(3, 1) && 0.0f == toXYZD50.get(3, 2) &&
306 0 : 0.0f == toXYZD50.get(0, 3) && 0.0f == toXYZD50.get(1, 3) && 0.0f == toXYZD50.get(2, 3) &&
307 0 : 1.0f == toXYZD50.get(3, 3);
308 : }
309 :
310 0 : sk_sp<SkData> SkICC::WriteToICC(const SkColorSpaceTransferFn& fn, const SkMatrix44& toXYZD50) {
311 0 : if (!is_3x3(toXYZD50) || !is_valid_transfer_fn(fn)) {
312 0 : return nullptr;
313 : }
314 :
315 0 : SkAutoMalloc profile(kICCProfileSize);
316 0 : uint8_t* ptr = (uint8_t*) profile.get();
317 :
318 : // Write profile header
319 0 : memcpy(ptr, kICCHeader, sizeof(kICCHeader));
320 0 : ptr += sizeof(kICCHeader);
321 :
322 : // Write tag table
323 0 : memcpy(ptr, kICCTagTable, sizeof(kICCTagTable));
324 0 : ptr += sizeof(kICCTagTable);
325 :
326 : // Write profile description tag
327 0 : memcpy(ptr, kDescriptionTagHeader, sizeof(kDescriptionTagHeader));
328 0 : ptr += sizeof(kDescriptionTagHeader);
329 0 : memcpy(ptr, kDescriptionTagBody, sizeof(kDescriptionTagBody));
330 0 : ptr += sizeof(kDescriptionTagBody);
331 :
332 : // Write XYZ tags
333 0 : write_xyz_tag((uint32_t*) ptr, toXYZD50, 0);
334 0 : ptr += kTAG_XYZ_Bytes;
335 0 : write_xyz_tag((uint32_t*) ptr, toXYZD50, 1);
336 0 : ptr += kTAG_XYZ_Bytes;
337 0 : write_xyz_tag((uint32_t*) ptr, toXYZD50, 2);
338 0 : ptr += kTAG_XYZ_Bytes;
339 :
340 : // Write TRC tag
341 0 : write_trc_tag((uint32_t*) ptr, fn);
342 0 : ptr += kTAG_TRC_Bytes;
343 :
344 : // Write white point tag (must be D50)
345 0 : memcpy(ptr, kWhitePointTag, sizeof(kWhitePointTag));
346 0 : ptr += sizeof(kWhitePointTag);
347 :
348 : // Write copyright tag
349 0 : memcpy(ptr, kCopyrightTagHeader, sizeof(kCopyrightTagHeader));
350 0 : ptr += sizeof(kCopyrightTagHeader);
351 0 : memcpy(ptr, kCopyrightTagBody, sizeof(kCopyrightTagBody));
352 0 : ptr += sizeof(kCopyrightTagBody);
353 :
354 0 : SkASSERT(kICCProfileSize == ptr - (uint8_t*) profile.get());
355 0 : return SkData::MakeFromMalloc(profile.release(), kICCProfileSize);
356 : }
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