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JBig2_GrrdProc.cpp
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1// Copyright 2015 The PDFium Authors
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
15CJBig2_GRRDProc::CJBig2_GRRDProc() = default;
16
17CJBig2_GRRDProc::~CJBig2_GRRDProc() = default;
18
19std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::Decode(
20 CJBig2_ArithDecoder* pArithDecoder,
21 JBig2ArithCtx* grContext) {
22 if (!CJBig2_Image::IsValidImageSize(GRW, GRH))
23 return std::make_unique<CJBig2_Image>(GRW, GRH);
24
25 if (!GRTEMPLATE) {
26 if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
27 (GRAT[3] == -1) && (GRREFERENCEDX == 0) &&
28 (GRW == (uint32_t)GRREFERENCE->width())) {
29 return DecodeTemplate0Opt(pArithDecoder, grContext);
30 }
31 return DecodeTemplate0Unopt(pArithDecoder, grContext);
32 }
33
34 if ((GRREFERENCEDX == 0) && (GRW == (uint32_t)GRREFERENCE->width()))
35 return DecodeTemplate1Opt(pArithDecoder, grContext);
36
37 return DecodeTemplate1Unopt(pArithDecoder, grContext);
38}
39
40std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate0Unopt(
41 CJBig2_ArithDecoder* pArithDecoder,
42 JBig2ArithCtx* grContext) {
43 auto GRREG = std::make_unique<CJBig2_Image>(GRW, GRH);
44 if (!GRREG->data())
45 return nullptr;
46
47 GRREG->Fill(false);
48 int LTP = 0;
49 for (uint32_t h = 0; h < GRH; h++) {
50 if (TPGRON) {
51 if (pArithDecoder->IsComplete())
52 return nullptr;
53
54 LTP = LTP ^ pArithDecoder->Decode(&grContext[0x0010]);
55 }
56 uint32_t lines[5];
57 lines[0] = GRREG->GetPixel(1, h - 1);
58 lines[0] |= GRREG->GetPixel(0, h - 1) << 1;
59 lines[1] = 0;
60 lines[2] = GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
61 lines[2] |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
62 << 1;
63 lines[3] = GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
64 lines[3] |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
65 lines[3] |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
66 << 2;
67 lines[4] = GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
68 lines[4] |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
69 << 1;
70 lines[4] |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
71 << 2;
72 if (!LTP) {
73 for (uint32_t w = 0; w < GRW; w++) {
74 uint32_t CONTEXT =
75 DecodeTemplate0UnoptCalculateContext(*GRREG, lines, w, h);
76 if (pArithDecoder->IsComplete())
77 return nullptr;
78
79 int bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
80 DecodeTemplate0UnoptSetPixel(GRREG.get(), lines, w, h, bVal);
81 }
82 } else {
83 for (uint32_t w = 0; w < GRW; w++) {
84 int bVal = GRREFERENCE->GetPixel(w, h);
85 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w - 1, h - 1)) &&
86 (bVal == GRREFERENCE->GetPixel(w, h - 1)) &&
87 (bVal == GRREFERENCE->GetPixel(w + 1, h - 1)) &&
88 (bVal == GRREFERENCE->GetPixel(w - 1, h)) &&
89 (bVal == GRREFERENCE->GetPixel(w + 1, h)) &&
90 (bVal == GRREFERENCE->GetPixel(w - 1, h + 1)) &&
91 (bVal == GRREFERENCE->GetPixel(w, h + 1)) &&
92 (bVal == GRREFERENCE->GetPixel(w + 1, h + 1)))) {
93 uint32_t CONTEXT =
94 DecodeTemplate0UnoptCalculateContext(*GRREG, lines, w, h);
95 if (pArithDecoder->IsComplete())
96 return nullptr;
97
98 bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
99 }
100 DecodeTemplate0UnoptSetPixel(GRREG.get(), lines, w, h, bVal);
101 }
102 }
103 }
104 return GRREG;
105}
106
107uint32_t CJBig2_GRRDProc::DecodeTemplate0UnoptCalculateContext(
108 const CJBig2_Image& GRREG,
109 const uint32_t* lines,
110 uint32_t w,
111 uint32_t h) const {
112 uint32_t CONTEXT = lines[4];
113 CONTEXT |= lines[3] << 3;
114 CONTEXT |= lines[2] << 6;
115 CONTEXT |= GRREFERENCE->GetPixel(w - GRREFERENCEDX + GRAT[2],
116 h - GRREFERENCEDY + GRAT[3])
117 << 8;
118 CONTEXT |= lines[1] << 9;
119 CONTEXT |= lines[0] << 10;
120 CONTEXT |= GRREG.GetPixel(w + GRAT[0], h + GRAT[1]) << 12;
121 return CONTEXT;
122}
123
124void CJBig2_GRRDProc::DecodeTemplate0UnoptSetPixel(CJBig2_Image* GRREG,
125 uint32_t* lines,
126 uint32_t w,
127 uint32_t h,
128 int bVal) {
129 GRREG->SetPixel(w, h, bVal);
130 lines[0] = ((lines[0] << 1) | GRREG->GetPixel(w + 2, h - 1)) & 0x03;
131 lines[1] = ((lines[1] << 1) | bVal) & 0x01;
132 lines[2] = ((lines[2] << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
133 h - GRREFERENCEDY - 1)) &
134 0x03;
135 lines[3] = ((lines[3] << 1) |
136 GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY)) &
137 0x07;
138 lines[4] = ((lines[4] << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
139 h - GRREFERENCEDY + 1)) &
140 0x07;
141}
142
143std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate0Opt(
144 CJBig2_ArithDecoder* pArithDecoder,
145 JBig2ArithCtx* grContext) {
146 if (!GRREFERENCE->data())
147 return nullptr;
148
149 int32_t iGRW = static_cast<int32_t>(GRW);
150 int32_t iGRH = static_cast<int32_t>(GRH);
151 auto GRREG = std::make_unique<CJBig2_Image>(iGRW, iGRH);
152 if (!GRREG->data())
153 return nullptr;
154
155 int LTP = 0;
156 uint8_t* pLine = GRREG->data();
157 uint8_t* pLineR = GRREFERENCE->data();
158 intptr_t nStride = GRREG->stride();
159 intptr_t nStrideR = GRREFERENCE->stride();
160 int32_t GRWR = GRREFERENCE->width();
161 int32_t GRHR = GRREFERENCE->height();
162 if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1)
163 GRREFERENCEDY = 0;
164 intptr_t nOffset = -GRREFERENCEDY * nStrideR;
165 for (int32_t h = 0; h < iGRH; h++) {
166 if (TPGRON) {
167 if (pArithDecoder->IsComplete())
168 return nullptr;
169
170 LTP = LTP ^ pArithDecoder->Decode(&grContext[0x0010]);
171 }
172 uint32_t line1 = (h > 0) ? pLine[-nStride] << 4 : 0;
173 int32_t reference_h = h - GRREFERENCEDY;
174 bool line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
175 bool line2_r_ok = (reference_h > -1 && reference_h < GRHR);
176 bool line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
177 uint32_t line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
178 uint32_t line2_r = line2_r_ok ? pLineR[nOffset] : 0;
179 uint32_t line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
180 if (!LTP) {
181 uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
182 ((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
183 for (int32_t w = 0; w < iGRW; w += 8) {
184 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
185 if (h > 0) {
186 line1 = (line1 << 8) |
187 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
188 }
189 if (h > GRHR + GRREFERENCEDY + 1) {
190 line1_r = 0;
191 line2_r = 0;
192 line3_r = 0;
193 } else {
194 if (line1_r_ok) {
195 line1_r =
196 (line1_r << 8) |
197 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
198 }
199 if (line2_r_ok) {
200 line2_r = (line2_r << 8) |
201 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
202 }
203 if (line3_r_ok) {
204 line3_r =
205 (line3_r << 8) |
206 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
207 } else {
208 line3_r = 0;
209 }
210 }
211 uint8_t cVal = 0;
212 for (int32_t k = 0; k < nBits; k++) {
213 int bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
214 cVal |= bVal << (7 - k);
215 CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
216 ((line1 >> (7 - k)) & 0x0400) |
217 ((line1_r >> (7 - k)) & 0x0040) |
218 ((line2_r >> (10 - k)) & 0x0008) |
219 ((line3_r >> (13 - k)) & 0x0001);
220 }
221 pLine[w >> 3] = cVal;
222 }
223 } else {
224 uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
225 ((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
226 for (int32_t w = 0; w < iGRW; w += 8) {
227 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
228 if (h > 0) {
229 line1 = (line1 << 8) |
230 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 4 : 0);
231 }
232 if (line1_r_ok) {
233 line1_r =
234 (line1_r << 8) |
235 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
236 }
237 if (line2_r_ok) {
238 line2_r = (line2_r << 8) |
239 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
240 }
241 if (line3_r_ok) {
242 line3_r =
243 (line3_r << 8) |
244 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
245 } else {
246 line3_r = 0;
247 }
248 uint8_t cVal = 0;
249 for (int32_t k = 0; k < nBits; k++) {
250 int bVal = GRREFERENCE->GetPixel(w + k, h);
251 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w + k - 1, h - 1)) &&
252 (bVal == GRREFERENCE->GetPixel(w + k, h - 1)) &&
253 (bVal == GRREFERENCE->GetPixel(w + k + 1, h - 1)) &&
254 (bVal == GRREFERENCE->GetPixel(w + k - 1, h)) &&
255 (bVal == GRREFERENCE->GetPixel(w + k + 1, h)) &&
256 (bVal == GRREFERENCE->GetPixel(w + k - 1, h + 1)) &&
257 (bVal == GRREFERENCE->GetPixel(w + k, h + 1)) &&
258 (bVal == GRREFERENCE->GetPixel(w + k + 1, h + 1)))) {
259 if (pArithDecoder->IsComplete())
260 return nullptr;
261
262 bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
263 }
264 cVal |= bVal << (7 - k);
265 CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
266 ((line1 >> (7 - k)) & 0x0400) |
267 ((line1_r >> (7 - k)) & 0x0040) |
268 ((line2_r >> (10 - k)) & 0x0008) |
269 ((line3_r >> (13 - k)) & 0x0001);
270 }
271 pLine[w >> 3] = cVal;
272 }
273 }
274 pLine += nStride;
275 if (h < GRHR + GRREFERENCEDY)
276 pLineR += nStrideR;
277 }
278 return GRREG;
279}
280
281std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate1Unopt(
282 CJBig2_ArithDecoder* pArithDecoder,
283 JBig2ArithCtx* grContext) {
284 auto GRREG = std::make_unique<CJBig2_Image>(GRW, GRH);
285 if (!GRREG->data())
286 return nullptr;
287
288 GRREG->Fill(false);
289 int LTP = 0;
290 for (uint32_t h = 0; h < GRH; h++) {
291 if (TPGRON) {
292 if (pArithDecoder->IsComplete())
293 return nullptr;
294
295 LTP = LTP ^ pArithDecoder->Decode(&grContext[0x0008]);
296 }
297 if (!LTP) {
298 uint32_t line1 = GRREG->GetPixel(1, h - 1);
299 line1 |= GRREG->GetPixel(0, h - 1) << 1;
300 line1 |= GRREG->GetPixel(-1, h - 1) << 2;
301 uint32_t line2 = 0;
302 uint32_t line3 =
303 GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
304 uint32_t line4 =
305 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
306 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
307 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
308 << 2;
309 uint32_t line5 =
310 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
311 line5 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
312 << 1;
313 for (uint32_t w = 0; w < GRW; w++) {
314 uint32_t CONTEXT = line5;
315 CONTEXT |= line4 << 2;
316 CONTEXT |= line3 << 5;
317 CONTEXT |= line2 << 6;
318 CONTEXT |= line1 << 7;
319 if (pArithDecoder->IsComplete())
320 return nullptr;
321
322 int bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
323 GRREG->SetPixel(w, h, bVal);
324 line1 = ((line1 << 1) | GRREG->GetPixel(w + 2, h - 1)) & 0x07;
325 line2 = ((line2 << 1) | bVal) & 0x01;
326 line3 = ((line3 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 1,
327 h - GRREFERENCEDY - 1)) &
328 0x01;
329 line4 = ((line4 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
330 h - GRREFERENCEDY)) &
331 0x07;
332 line5 = ((line5 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
333 h - GRREFERENCEDY + 1)) &
334 0x03;
335 }
336 } else {
337 uint32_t line1 = GRREG->GetPixel(1, h - 1);
338 line1 |= GRREG->GetPixel(0, h - 1) << 1;
339 line1 |= GRREG->GetPixel(-1, h - 1) << 2;
340 uint32_t line2 = 0;
341 uint32_t line3 =
342 GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
343 uint32_t line4 =
344 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
345 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
346 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
347 << 2;
348 uint32_t line5 =
349 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
350 line5 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
351 << 1;
352 for (uint32_t w = 0; w < GRW; w++) {
353 int bVal = GRREFERENCE->GetPixel(w, h);
354 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w - 1, h - 1)) &&
355 (bVal == GRREFERENCE->GetPixel(w, h - 1)) &&
356 (bVal == GRREFERENCE->GetPixel(w + 1, h - 1)) &&
357 (bVal == GRREFERENCE->GetPixel(w - 1, h)) &&
358 (bVal == GRREFERENCE->GetPixel(w + 1, h)) &&
359 (bVal == GRREFERENCE->GetPixel(w - 1, h + 1)) &&
360 (bVal == GRREFERENCE->GetPixel(w, h + 1)) &&
361 (bVal == GRREFERENCE->GetPixel(w + 1, h + 1)))) {
362 uint32_t CONTEXT = line5;
363 CONTEXT |= line4 << 2;
364 CONTEXT |= line3 << 5;
365 CONTEXT |= line2 << 6;
366 CONTEXT |= line1 << 7;
367 if (pArithDecoder->IsComplete())
368 return nullptr;
369
370 bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
371 }
372 GRREG->SetPixel(w, h, bVal);
373 line1 = ((line1 << 1) | GRREG->GetPixel(w + 2, h - 1)) & 0x07;
374 line2 = ((line2 << 1) | bVal) & 0x01;
375 line3 = ((line3 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 1,
376 h - GRREFERENCEDY - 1)) &
377 0x01;
378 line4 = ((line4 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
379 h - GRREFERENCEDY)) &
380 0x07;
381 line5 = ((line5 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
382 h - GRREFERENCEDY + 1)) &
383 0x03;
384 }
385 }
386 }
387 return GRREG;
388}
389
390std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate1Opt(
391 CJBig2_ArithDecoder* pArithDecoder,
392 JBig2ArithCtx* grContext) {
393 if (!GRREFERENCE->data())
394 return nullptr;
395
396 int32_t iGRW = static_cast<int32_t>(GRW);
397 int32_t iGRH = static_cast<int32_t>(GRH);
398 auto GRREG = std::make_unique<CJBig2_Image>(iGRW, iGRH);
399 if (!GRREG->data())
400 return nullptr;
401
402 int LTP = 0;
403 uint8_t* pLine = GRREG->data();
404 uint8_t* pLineR = GRREFERENCE->data();
405 intptr_t nStride = GRREG->stride();
406 intptr_t nStrideR = GRREFERENCE->stride();
407 int32_t GRWR = GRREFERENCE->width();
408 int32_t GRHR = GRREFERENCE->height();
409 if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1) {
410 GRREFERENCEDY = 0;
411 }
412 intptr_t nOffset = -GRREFERENCEDY * nStrideR;
413 for (int32_t h = 0; h < iGRH; h++) {
414 if (TPGRON) {
415 if (pArithDecoder->IsComplete())
416 return nullptr;
417
418 LTP = LTP ^ pArithDecoder->Decode(&grContext[0x0008]);
419 }
420 uint32_t line1 = (h > 0) ? pLine[-nStride] << 1 : 0;
421 int32_t reference_h = h - GRREFERENCEDY;
422 bool line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
423 bool line2_r_ok = (reference_h > -1 && reference_h < GRHR);
424 bool line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
425 uint32_t line1_r = line1_r_ok ? pLineR[nOffset - nStrideR] : 0;
426 uint32_t line2_r = line2_r_ok ? pLineR[nOffset] : 0;
427 uint32_t line3_r = line3_r_ok ? pLineR[nOffset + nStrideR] : 0;
428 if (!LTP) {
429 uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
430 ((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
431 for (int32_t w = 0; w < iGRW; w += 8) {
432 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
433 if (h > 0)
434 line1 = (line1 << 8) |
435 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
436 if (line1_r_ok)
437 line1_r =
438 (line1_r << 8) |
439 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
440 if (line2_r_ok)
441 line2_r = (line2_r << 8) |
442 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
443 if (line3_r_ok) {
444 line3_r =
445 (line3_r << 8) |
446 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
447 } else {
448 line3_r = 0;
449 }
450 uint8_t cVal = 0;
451 for (int32_t k = 0; k < nBits; k++) {
452 int bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
453 cVal |= bVal << (7 - k);
454 CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
455 ((line1 >> (7 - k)) & 0x0080) |
456 ((line1_r >> (9 - k)) & 0x0020) |
457 ((line2_r >> (11 - k)) & 0x0004) |
458 ((line3_r >> (13 - k)) & 0x0001);
459 }
460 pLine[w >> 3] = cVal;
461 }
462 } else {
463 uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
464 ((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
465 for (int32_t w = 0; w < iGRW; w += 8) {
466 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
467 if (h > 0)
468 line1 = (line1 << 8) |
469 (w + 8 < iGRW ? pLine[-nStride + (w >> 3) + 1] << 1 : 0);
470 if (line1_r_ok)
471 line1_r =
472 (line1_r << 8) |
473 (w + 8 < GRWR ? pLineR[nOffset - nStrideR + (w >> 3) + 1] : 0);
474 if (line2_r_ok)
475 line2_r = (line2_r << 8) |
476 (w + 8 < GRWR ? pLineR[nOffset + (w >> 3) + 1] : 0);
477 if (line3_r_ok) {
478 line3_r =
479 (line3_r << 8) |
480 (w + 8 < GRWR ? pLineR[nOffset + nStrideR + (w >> 3) + 1] : 0);
481 } else {
482 line3_r = 0;
483 }
484 uint8_t cVal = 0;
485 for (int32_t k = 0; k < nBits; k++) {
486 int bVal = GRREFERENCE->GetPixel(w + k, h);
487 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w + k - 1, h - 1)) &&
488 (bVal == GRREFERENCE->GetPixel(w + k, h - 1)) &&
489 (bVal == GRREFERENCE->GetPixel(w + k + 1, h - 1)) &&
490 (bVal == GRREFERENCE->GetPixel(w + k - 1, h)) &&
491 (bVal == GRREFERENCE->GetPixel(w + k + 1, h)) &&
492 (bVal == GRREFERENCE->GetPixel(w + k - 1, h + 1)) &&
493 (bVal == GRREFERENCE->GetPixel(w + k, h + 1)) &&
494 (bVal == GRREFERENCE->GetPixel(w + k + 1, h + 1)))) {
495 if (pArithDecoder->IsComplete())
496 return nullptr;
497
498 bVal = pArithDecoder->Decode(&grContext[CONTEXT]);
499 }
500 cVal |= bVal << (7 - k);
501 CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
502 ((line1 >> (7 - k)) & 0x0080) |
503 ((line1_r >> (9 - k)) & 0x0020) |
504 ((line2_r >> (11 - k)) & 0x0004) |
505 ((line3_r >> (13 - k)) & 0x0001);
506 }
507 pLine[w >> 3] = cVal;
508 }
509 }
510 pLine += nStride;
511 if (h < GRHR + GRREFERENCEDY)
512 pLineR += nStrideR;
513 }
514 return GRREG;
515}
CJBig2_ArithDecoder
Definition JBig2_ArithDecoder.h:39
CJBig2_ArithDecoder::IsComplete
bool IsComplete() const
Definition JBig2_ArithDecoder.h:46
CJBig2_ArithDecoder::Decode
int Decode(JBig2ArithCtx *pCX)
Definition JBig2_ArithDecoder.cpp:68
CJBig2_GRRDProc
Definition JBig2_GrrdProc.h:20
CJBig2_GRRDProc::GRREFERENCEDY
int32_t GRREFERENCEDY
Definition JBig2_GrrdProc.h:33
CJBig2_GRRDProc::CJBig2_GRRDProc
CJBig2_GRRDProc()
CJBig2_GRRDProc::GRTEMPLATE
bool GRTEMPLATE
Definition JBig2_GrrdProc.h:28
CJBig2_GRRDProc::~CJBig2_GRRDProc
~CJBig2_GRRDProc()
CJBig2_GRRDProc::GRW
uint32_t GRW
Definition JBig2_GrrdProc.h:30
CJBig2_GRRDProc::GRAT
int8_t GRAT[4]
Definition JBig2_GrrdProc.h:35
CJBig2_GRRDProc::TPGRON
bool TPGRON
Definition JBig2_GrrdProc.h:29
CJBig2_GRRDProc::GRH
uint32_t GRH
Definition JBig2_GrrdProc.h:31
CJBig2_GRRDProc::Decode
std::unique_ptr< CJBig2_Image > Decode(CJBig2_ArithDecoder *pArithDecoder, JBig2ArithCtx *grContext)
Definition JBig2_GrrdProc.cpp:19
CJBig2_Image
Definition JBig2_Image.h:27
CJBig2_Image::SetPixel
void SetPixel(int32_t x, int32_t y, int v)
Definition JBig2_Image.cpp:118
CJBig2_Image::IsValidImageSize
static bool IsValidImageSize(int32_t w, int32_t h)
Definition JBig2_Image.cpp:98
CJBig2_Image::GetPixel
int GetPixel(int32_t x, int32_t y) const
Definition JBig2_Image.cpp:102