1 // Copyright 2015 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "core/fxcodec/jbig2/JBig2_GrrdProc.h"
8
9 #include <memory>
10
11 #include "core/fxcodec/jbig2/JBig2_ArithDecoder.h"
12 #include "core/fxcodec/jbig2/JBig2_BitStream.h"
13 #include "core/fxcodec/jbig2/JBig2_Image.h"
14 #include "third_party/base/ptr_util.h"
15
decode(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * grContext)16 std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::decode(
17 CJBig2_ArithDecoder* pArithDecoder,
18 JBig2ArithCtx* grContext) {
19 if (GRW == 0 || GRW > JBIG2_MAX_IMAGE_SIZE || GRH == 0 ||
20 GRH > JBIG2_MAX_IMAGE_SIZE) {
21 return pdfium::MakeUnique<CJBig2_Image>(GRW, GRH);
22 }
23
24 if (!GRTEMPLATE) {
25 if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
26 (GRAT[3] == -1) && (GRREFERENCEDX == 0) &&
27 (GRW == (uint32_t)GRREFERENCE->width())) {
28 return decode_Template0_opt(pArithDecoder, grContext);
29 }
30 return decode_Template0_unopt(pArithDecoder, grContext);
31 }
32
33 if ((GRREFERENCEDX == 0) && (GRW == (uint32_t)GRREFERENCE->width()))
34 return decode_Template1_opt(pArithDecoder, grContext);
35
36 return decode_Template1_unopt(pArithDecoder, grContext);
37 }
38
decode_Template0_unopt(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * grContext)39 std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::decode_Template0_unopt(
40 CJBig2_ArithDecoder* pArithDecoder,
41 JBig2ArithCtx* grContext) {
42 int LTP = 0;
43 auto GRREG = pdfium::MakeUnique<CJBig2_Image>(GRW, GRH);
44 GRREG->fill(0);
45 for (uint32_t h = 0; h < GRH; h++) {
46 if (TPGRON) {
47 if (pArithDecoder->IsComplete())
48 return nullptr;
49
50 LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0010]);
51 }
52 uint32_t lines[5];
53 lines[0] = GRREG->getPixel(1, h - 1);
54 lines[0] |= GRREG->getPixel(0, h - 1) << 1;
55 lines[1] = 0;
56 lines[2] = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
57 lines[2] |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
58 << 1;
59 lines[3] = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
60 lines[3] |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
61 lines[3] |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
62 << 2;
63 lines[4] = GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
64 lines[4] |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
65 << 1;
66 lines[4] |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
67 << 2;
68 if (!LTP) {
69 for (uint32_t w = 0; w < GRW; w++) {
70 uint32_t CONTEXT =
71 decode_Template0_unopt_CalculateContext(*GRREG, lines, w, h);
72 if (pArithDecoder->IsComplete())
73 return nullptr;
74
75 int bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
76 decode_Template0_unopt_SetPixel(GRREG.get(), lines, w, h, bVal);
77 }
78 } else {
79 for (uint32_t w = 0; w < GRW; w++) {
80 int bVal = GRREFERENCE->getPixel(w, h);
81 if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w - 1, h - 1)) &&
82 (bVal == GRREFERENCE->getPixel(w, h - 1)) &&
83 (bVal == GRREFERENCE->getPixel(w + 1, h - 1)) &&
84 (bVal == GRREFERENCE->getPixel(w - 1, h)) &&
85 (bVal == GRREFERENCE->getPixel(w + 1, h)) &&
86 (bVal == GRREFERENCE->getPixel(w - 1, h + 1)) &&
87 (bVal == GRREFERENCE->getPixel(w, h + 1)) &&
88 (bVal == GRREFERENCE->getPixel(w + 1, h + 1)))) {
89 uint32_t CONTEXT =
90 decode_Template0_unopt_CalculateContext(*GRREG, lines, w, h);
91 if (pArithDecoder->IsComplete())
92 return nullptr;
93
94 bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
95 }
96 decode_Template0_unopt_SetPixel(GRREG.get(), lines, w, h, bVal);
97 }
98 }
99 }
100 return GRREG;
101 }
102
decode_Template0_unopt_CalculateContext(const CJBig2_Image & GRREG,const uint32_t * lines,uint32_t w,uint32_t h) const103 uint32_t CJBig2_GRRDProc::decode_Template0_unopt_CalculateContext(
104 const CJBig2_Image& GRREG,
105 const uint32_t* lines,
106 uint32_t w,
107 uint32_t h) const {
108 uint32_t CONTEXT = lines[4];
109 CONTEXT |= lines[3] << 3;
110 CONTEXT |= lines[2] << 6;
111 CONTEXT |= GRREFERENCE->getPixel(w - GRREFERENCEDX + GRAT[2],
112 h - GRREFERENCEDY + GRAT[3])
113 << 8;
114 CONTEXT |= lines[1] << 9;
115 CONTEXT |= lines[0] << 10;
116 CONTEXT |= GRREG.getPixel(w + GRAT[0], h + GRAT[1]) << 12;
117 return CONTEXT;
118 }
119
decode_Template0_unopt_SetPixel(CJBig2_Image * GRREG,uint32_t * lines,uint32_t w,uint32_t h,int bVal)120 void CJBig2_GRRDProc::decode_Template0_unopt_SetPixel(CJBig2_Image* GRREG,
121 uint32_t* lines,
122 uint32_t w,
123 uint32_t h,
124 int bVal) {
125 GRREG->setPixel(w, h, bVal);
126 lines[0] = ((lines[0] << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x03;
127 lines[1] = ((lines[1] << 1) | bVal) & 0x01;
128 lines[2] = ((lines[2] << 1) | GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
129 h - GRREFERENCEDY - 1)) &
130 0x03;
131 lines[3] = ((lines[3] << 1) |
132 GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
133 0x07;
134 lines[4] = ((lines[4] << 1) | GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
135 h - GRREFERENCEDY + 1)) &
136 0x07;
137 }
138
decode_Template0_opt(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * grContext)139 std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::decode_Template0_opt(
140 CJBig2_ArithDecoder* pArithDecoder,
141 JBig2ArithCtx* grContext) {
142 if (!GRREFERENCE->data())
143 return nullptr;
144
145 int32_t iGRW = static_cast<int32_t>(GRW);
146 int32_t iGRH = static_cast<int32_t>(GRH);
147 auto GRREG = pdfium::MakeUnique<CJBig2_Image>(iGRW, iGRH);
148 if (!GRREG->data())
149 return nullptr;
150
151 int LTP = 0;
152 uint8_t* pLine = GRREG->data();
153 uint8_t* pLineR = GRREFERENCE->data();
154 intptr_t nStride = GRREG->stride();
155 intptr_t nStrideR = GRREFERENCE->stride();
156 int32_t GRWR = GRREFERENCE->width();
157 int32_t GRHR = GRREFERENCE->height();
158 if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1)
159 GRREFERENCEDY = 0;
160 intptr_t nOffset = -GRREFERENCEDY * nStrideR;
161 for (int32_t h = 0; h < iGRH; h++) {
162 if (TPGRON) {
163 if (pArithDecoder->IsComplete())
164 return nullptr;
165
166 LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0010]);
167 }
168 uint32_t line1 = (h > 0) ? pLine[-nStride] << 4 : 0;
169 int32_t reference_h = h - GRREFERENCEDY;
170 bool line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
171 bool line2_r_ok = (reference_h > -1 && reference_h < GRHR);
172 bool line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
173 uint32_t line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
174 uint32_t line2_r = line2_r_ok ? pLineR[nOffset] : 0;
175 uint32_t line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
176 if (!LTP) {
177 uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
178 ((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
179 for (int32_t w = 0; w < iGRW; w += 8) {
180 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
181 if (h > 0) {
182 line1 = (line1 << 8) |
183 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
184 }
185 if (h > GRHR + GRREFERENCEDY + 1) {
186 line1_r = 0;
187 line2_r = 0;
188 line3_r = 0;
189 } else {
190 if (line1_r_ok) {
191 line1_r =
192 (line1_r << 8) |
193 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
194 }
195 if (line2_r_ok) {
196 line2_r = (line2_r << 8) |
197 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
198 }
199 if (line3_r_ok) {
200 line3_r =
201 (line3_r << 8) |
202 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
203 } else {
204 line3_r = 0;
205 }
206 }
207 uint8_t cVal = 0;
208 for (int32_t k = 0; k < nBits; k++) {
209 if (pArithDecoder->IsComplete())
210 return nullptr;
211
212 int bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
213 cVal |= bVal << (7 - k);
214 CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
215 ((line1 >> (7 - k)) & 0x0400) |
216 ((line1_r >> (7 - k)) & 0x0040) |
217 ((line2_r >> (10 - k)) & 0x0008) |
218 ((line3_r >> (13 - k)) & 0x0001);
219 }
220 pLine[w >> 3] = cVal;
221 }
222 } else {
223 uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
224 ((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
225 for (int32_t w = 0; w < iGRW; w += 8) {
226 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
227 if (h > 0) {
228 line1 = (line1 << 8) |
229 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
230 }
231 if (line1_r_ok) {
232 line1_r =
233 (line1_r << 8) |
234 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
235 }
236 if (line2_r_ok) {
237 line2_r = (line2_r << 8) |
238 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
239 }
240 if (line3_r_ok) {
241 line3_r =
242 (line3_r << 8) |
243 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
244 } else {
245 line3_r = 0;
246 }
247 uint8_t cVal = 0;
248 for (int32_t k = 0; k < nBits; k++) {
249 int bVal = GRREFERENCE->getPixel(w + k, h);
250 if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w + k - 1, h - 1)) &&
251 (bVal == GRREFERENCE->getPixel(w + k, h - 1)) &&
252 (bVal == GRREFERENCE->getPixel(w + k + 1, h - 1)) &&
253 (bVal == GRREFERENCE->getPixel(w + k - 1, h)) &&
254 (bVal == GRREFERENCE->getPixel(w + k + 1, h)) &&
255 (bVal == GRREFERENCE->getPixel(w + k - 1, h + 1)) &&
256 (bVal == GRREFERENCE->getPixel(w + k, h + 1)) &&
257 (bVal == GRREFERENCE->getPixel(w + k + 1, h + 1)))) {
258 if (pArithDecoder->IsComplete())
259 return nullptr;
260
261 bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
262 }
263 cVal |= bVal << (7 - k);
264 CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
265 ((line1 >> (7 - k)) & 0x0400) |
266 ((line1_r >> (7 - k)) & 0x0040) |
267 ((line2_r >> (10 - k)) & 0x0008) |
268 ((line3_r >> (13 - k)) & 0x0001);
269 }
270 pLine[w >> 3] = cVal;
271 }
272 }
273 pLine += nStride;
274 if (h < GRHR + GRREFERENCEDY)
275 pLineR += nStrideR;
276 }
277 return GRREG;
278 }
279
decode_Template1_unopt(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * grContext)280 std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::decode_Template1_unopt(
281 CJBig2_ArithDecoder* pArithDecoder,
282 JBig2ArithCtx* grContext) {
283 int LTP = 0;
284 auto GRREG = pdfium::MakeUnique<CJBig2_Image>(GRW, GRH);
285 GRREG->fill(0);
286 for (uint32_t h = 0; h < GRH; h++) {
287 if (TPGRON) {
288 if (pArithDecoder->IsComplete())
289 return nullptr;
290
291 LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0008]);
292 }
293 if (!LTP) {
294 uint32_t line1 = GRREG->getPixel(1, h - 1);
295 line1 |= GRREG->getPixel(0, h - 1) << 1;
296 line1 |= GRREG->getPixel(-1, h - 1) << 2;
297 uint32_t line2 = 0;
298 uint32_t line3 =
299 GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
300 uint32_t line4 =
301 GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
302 line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
303 line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
304 << 2;
305 uint32_t line5 =
306 GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
307 line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
308 << 1;
309 for (uint32_t w = 0; w < GRW; w++) {
310 uint32_t CONTEXT = line5;
311 CONTEXT |= line4 << 2;
312 CONTEXT |= line3 << 5;
313 CONTEXT |= line2 << 6;
314 CONTEXT |= line1 << 7;
315 if (pArithDecoder->IsComplete())
316 return nullptr;
317
318 int bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
319 GRREG->setPixel(w, h, bVal);
320 line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x07;
321 line2 = ((line2 << 1) | bVal) & 0x01;
322 line3 = ((line3 << 1) |
323 GRREFERENCE->getPixel(w - GRREFERENCEDX + 1,
324 h - GRREFERENCEDY - 1)) &
325 0x01;
326 line4 =
327 ((line4 << 1) |
328 GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
329 0x07;
330 line5 = ((line5 << 1) |
331 GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
332 h - GRREFERENCEDY + 1)) &
333 0x03;
334 }
335 } else {
336 uint32_t line1 = GRREG->getPixel(1, h - 1);
337 line1 |= GRREG->getPixel(0, h - 1) << 1;
338 line1 |= GRREG->getPixel(-1, h - 1) << 2;
339 uint32_t line2 = 0;
340 uint32_t line3 =
341 GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
342 uint32_t line4 =
343 GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
344 line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
345 line4 |= GRREFERENCE->getPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
346 << 2;
347 uint32_t line5 =
348 GRREFERENCE->getPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
349 line5 |= GRREFERENCE->getPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
350 << 1;
351 for (uint32_t w = 0; w < GRW; w++) {
352 int bVal = GRREFERENCE->getPixel(w, h);
353 if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w - 1, h - 1)) &&
354 (bVal == GRREFERENCE->getPixel(w, h - 1)) &&
355 (bVal == GRREFERENCE->getPixel(w + 1, h - 1)) &&
356 (bVal == GRREFERENCE->getPixel(w - 1, h)) &&
357 (bVal == GRREFERENCE->getPixel(w + 1, h)) &&
358 (bVal == GRREFERENCE->getPixel(w - 1, h + 1)) &&
359 (bVal == GRREFERENCE->getPixel(w, h + 1)) &&
360 (bVal == GRREFERENCE->getPixel(w + 1, h + 1)))) {
361 uint32_t CONTEXT = line5;
362 CONTEXT |= line4 << 2;
363 CONTEXT |= line3 << 5;
364 CONTEXT |= line2 << 6;
365 CONTEXT |= line1 << 7;
366 if (pArithDecoder->IsComplete())
367 return nullptr;
368
369 bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
370 }
371 GRREG->setPixel(w, h, bVal);
372 line1 = ((line1 << 1) | GRREG->getPixel(w + 2, h - 1)) & 0x07;
373 line2 = ((line2 << 1) | bVal) & 0x01;
374 line3 = ((line3 << 1) |
375 GRREFERENCE->getPixel(w - GRREFERENCEDX + 1,
376 h - GRREFERENCEDY - 1)) &
377 0x01;
378 line4 =
379 ((line4 << 1) |
380 GRREFERENCE->getPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
381 0x07;
382 line5 = ((line5 << 1) |
383 GRREFERENCE->getPixel(w - GRREFERENCEDX + 2,
384 h - GRREFERENCEDY + 1)) &
385 0x03;
386 }
387 }
388 }
389 return GRREG;
390 }
391
decode_Template1_opt(CJBig2_ArithDecoder * pArithDecoder,JBig2ArithCtx * grContext)392 std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::decode_Template1_opt(
393 CJBig2_ArithDecoder* pArithDecoder,
394 JBig2ArithCtx* grContext) {
395 if (!GRREFERENCE->data())
396 return nullptr;
397
398 int32_t iGRW = static_cast<int32_t>(GRW);
399 int32_t iGRH = static_cast<int32_t>(GRH);
400 auto GRREG = pdfium::MakeUnique<CJBig2_Image>(iGRW, iGRH);
401 if (!GRREG->data())
402 return nullptr;
403
404 int LTP = 0;
405 uint8_t* pLine = GRREG->data();
406 uint8_t* pLineR = GRREFERENCE->data();
407 intptr_t nStride = GRREG->stride();
408 intptr_t nStrideR = GRREFERENCE->stride();
409 int32_t GRWR = GRREFERENCE->width();
410 int32_t GRHR = GRREFERENCE->height();
411 if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1) {
412 GRREFERENCEDY = 0;
413 }
414 intptr_t nOffset = -GRREFERENCEDY * nStrideR;
415 for (int32_t h = 0; h < iGRH; h++) {
416 if (TPGRON) {
417 if (pArithDecoder->IsComplete())
418 return nullptr;
419
420 LTP = LTP ^ pArithDecoder->DECODE(&grContext[0x0008]);
421 }
422 uint32_t line1 = (h > 0) ? pLine[-nStride] << 1 : 0;
423 int32_t reference_h = h - GRREFERENCEDY;
424 bool line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
425 bool line2_r_ok = (reference_h > -1 && reference_h < GRHR);
426 bool line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
427 uint32_t line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
428 uint32_t line2_r = line2_r_ok ? pLineR[nOffset] : 0;
429 uint32_t line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
430 if (!LTP) {
431 uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
432 ((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
433 for (int32_t w = 0; w < iGRW; w += 8) {
434 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
435 if (h > 0)
436 line1 = (line1 << 8) |
437 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
438 if (line1_r_ok)
439 line1_r =
440 (line1_r << 8) |
441 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
442 if (line2_r_ok)
443 line2_r = (line2_r << 8) |
444 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
445 if (line3_r_ok) {
446 line3_r =
447 (line3_r << 8) |
448 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
449 } else {
450 line3_r = 0;
451 }
452 uint8_t cVal = 0;
453 for (int32_t k = 0; k < nBits; k++) {
454 int bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
455 cVal |= bVal << (7 - k);
456 CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
457 ((line1 >> (7 - k)) & 0x0080) |
458 ((line1_r >> (9 - k)) & 0x0020) |
459 ((line2_r >> (11 - k)) & 0x0004) |
460 ((line3_r >> (13 - k)) & 0x0001);
461 }
462 pLine[w >> 3] = cVal;
463 }
464 } else {
465 uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
466 ((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
467 for (int32_t w = 0; w < iGRW; w += 8) {
468 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
469 if (h > 0)
470 line1 = (line1 << 8) |
471 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
472 if (line1_r_ok)
473 line1_r =
474 (line1_r << 8) |
475 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
476 if (line2_r_ok)
477 line2_r = (line2_r << 8) |
478 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
479 if (line3_r_ok) {
480 line3_r =
481 (line3_r << 8) |
482 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
483 } else {
484 line3_r = 0;
485 }
486 uint8_t cVal = 0;
487 for (int32_t k = 0; k < nBits; k++) {
488 int bVal = GRREFERENCE->getPixel(w + k, h);
489 if (!(TPGRON && (bVal == GRREFERENCE->getPixel(w + k - 1, h - 1)) &&
490 (bVal == GRREFERENCE->getPixel(w + k, h - 1)) &&
491 (bVal == GRREFERENCE->getPixel(w + k + 1, h - 1)) &&
492 (bVal == GRREFERENCE->getPixel(w + k - 1, h)) &&
493 (bVal == GRREFERENCE->getPixel(w + k + 1, h)) &&
494 (bVal == GRREFERENCE->getPixel(w + k - 1, h + 1)) &&
495 (bVal == GRREFERENCE->getPixel(w + k, h + 1)) &&
496 (bVal == GRREFERENCE->getPixel(w + k + 1, h + 1)))) {
497 if (pArithDecoder->IsComplete())
498 return nullptr;
499
500 bVal = pArithDecoder->DECODE(&grContext[CONTEXT]);
501 }
502 cVal |= bVal << (7 - k);
503 CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
504 ((line1 >> (7 - k)) & 0x0080) |
505 ((line1_r >> (9 - k)) & 0x0020) |
506 ((line2_r >> (11 - k)) & 0x0004) |
507 ((line3_r >> (13 - k)) & 0x0001);
508 }
509 pLine[w >> 3] = cVal;
510 }
511 }
512 pLine += nStride;
513 if (h < GRHR + GRREFERENCEDY)
514 pLineR += nStrideR;
515 }
516 return GRREG;
517 }
518