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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#include "core/fxcrt/compiler_specific.h"
15
16CJBig2_GRRDProc::CJBig2_GRRDProc() = default;
17
18CJBig2_GRRDProc::~CJBig2_GRRDProc() = default;
19
20std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::Decode(
21 CJBig2_ArithDecoder* pArithDecoder,
22 pdfium::span<JBig2ArithCtx> grContexts) {
23 if (!CJBig2_Image::IsValidImageSize(GRW, GRH))
24 return std::make_unique<CJBig2_Image>(GRW, GRH);
25
26 if (!GRTEMPLATE) {
27 if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
28 (GRAT[3] == -1) && (GRREFERENCEDX == 0) &&
29 (GRW == (uint32_t)GRREFERENCE->width())) {
30 return DecodeTemplate0Opt(pArithDecoder, grContexts);
31 }
32 return DecodeTemplate0Unopt(pArithDecoder, grContexts);
33 }
34
35 if ((GRREFERENCEDX == 0) && (GRW == (uint32_t)GRREFERENCE->width()))
36 return DecodeTemplate1Opt(pArithDecoder, grContexts);
37
38 return DecodeTemplate1Unopt(pArithDecoder, grContexts);
39}
40
41std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate0Unopt(
42 CJBig2_ArithDecoder* pArithDecoder,
43 pdfium::span<JBig2ArithCtx> grContexts) {
44 auto GRREG = std::make_unique<CJBig2_Image>(GRW, GRH);
45 if (!GRREG->data())
46 return nullptr;
47
48 GRREG->Fill(false);
49 int LTP = 0;
50 for (uint32_t h = 0; h < GRH; h++) {
51 if (TPGRON) {
52 if (pArithDecoder->IsComplete()) {
53 return nullptr;
54 }
55 LTP = LTP ^ pArithDecoder->Decode(&grContexts[0x0010]);
56 }
57 uint32_t lines[5];
58 lines[0] = GRREG->GetPixel(1, h - 1);
59 lines[0] |= GRREG->GetPixel(0, h - 1) << 1;
60 lines[1] = 0;
61 lines[2] = GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY - 1);
62 lines[2] |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1)
63 << 1;
64 lines[3] = GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
65 lines[3] |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
66 lines[3] |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
67 << 2;
68 lines[4] = GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
69 lines[4] |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
70 << 1;
71 lines[4] |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY + 1)
72 << 2;
73 if (!LTP) {
74 for (uint32_t w = 0; w < GRW; w++) {
75 uint32_t CONTEXT =
76 DecodeTemplate0UnoptCalculateContext(*GRREG, lines, w, h);
77 if (pArithDecoder->IsComplete())
78 return nullptr;
79
80 int bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
81 DecodeTemplate0UnoptSetPixel(GRREG.get(), lines, w, h, bVal);
82 }
83 } else {
84 for (uint32_t w = 0; w < GRW; w++) {
85 int bVal = GRREFERENCE->GetPixel(w, h);
86 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w - 1, h - 1)) &&
87 (bVal == GRREFERENCE->GetPixel(w, h - 1)) &&
88 (bVal == GRREFERENCE->GetPixel(w + 1, h - 1)) &&
89 (bVal == GRREFERENCE->GetPixel(w - 1, h)) &&
90 (bVal == GRREFERENCE->GetPixel(w + 1, h)) &&
91 (bVal == GRREFERENCE->GetPixel(w - 1, h + 1)) &&
92 (bVal == GRREFERENCE->GetPixel(w, h + 1)) &&
93 (bVal == GRREFERENCE->GetPixel(w + 1, h + 1)))) {
94 uint32_t CONTEXT =
95 DecodeTemplate0UnoptCalculateContext(*GRREG, lines, w, h);
96 if (pArithDecoder->IsComplete())
97 return nullptr;
98
99 bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
100 }
101 DecodeTemplate0UnoptSetPixel(GRREG.get(), lines, w, h, bVal);
102 }
103 }
104 }
105 return GRREG;
106}
107
108uint32_t CJBig2_GRRDProc::DecodeTemplate0UnoptCalculateContext(
109 const CJBig2_Image& GRREG,
110 const uint32_t* lines,
111 uint32_t w,
112 uint32_t h) const {
113 UNSAFE_TODO({
114 uint32_t CONTEXT = lines[4];
115 CONTEXT |= lines[3] << 3;
116 CONTEXT |= lines[2] << 6;
117 CONTEXT |= GRREFERENCE->GetPixel(w - GRREFERENCEDX + GRAT[2],
118 h - GRREFERENCEDY + GRAT[3])
119 << 8;
120 CONTEXT |= lines[1] << 9;
121 CONTEXT |= lines[0] << 10;
122 CONTEXT |= GRREG.GetPixel(w + GRAT[0], h + GRAT[1]) << 12;
123 return CONTEXT;
124 });
125}
126
127void CJBig2_GRRDProc::DecodeTemplate0UnoptSetPixel(CJBig2_Image* GRREG,
128 uint32_t* lines,
129 uint32_t w,
130 uint32_t h,
131 int bVal) {
132 GRREG->SetPixel(w, h, bVal);
133 UNSAFE_TODO({
134 lines[0] = ((lines[0] << 1) | GRREG->GetPixel(w + 2, h - 1)) & 0x03;
135 lines[1] = ((lines[1] << 1) | bVal) & 0x01;
136 lines[2] =
137 ((lines[2] << 1) |
138 GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY - 1)) &
139 0x03;
140 lines[3] = ((lines[3] << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
141 h - GRREFERENCEDY)) &
142 0x07;
143 lines[4] =
144 ((lines[4] << 1) |
145 GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2, h - GRREFERENCEDY + 1)) &
146 0x07;
147 });
148}
149
150std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate0Opt(
151 CJBig2_ArithDecoder* pArithDecoder,
152 pdfium::span<JBig2ArithCtx> grContexts) {
153 if (!GRREFERENCE->data())
154 return nullptr;
155
156 int32_t iGRW = static_cast<int32_t>(GRW);
157 int32_t iGRH = static_cast<int32_t>(GRH);
158 auto GRREG = std::make_unique<CJBig2_Image>(iGRW, iGRH);
159 if (!GRREG->data())
160 return nullptr;
161
162 int LTP = 0;
163 uint8_t* pLine = GRREG->data();
164 uint8_t* pLineR = GRREFERENCE->data();
165 intptr_t nStride = GRREG->stride();
166 intptr_t nStrideR = GRREFERENCE->stride();
167 int32_t GRWR = GRREFERENCE->width();
168 int32_t GRHR = GRREFERENCE->height();
169 if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1)
170 GRREFERENCEDY = 0;
171 intptr_t nOffset = -GRREFERENCEDY * nStrideR;
172 for (int32_t h = 0; h < iGRH; h++) {
173 if (TPGRON) {
174 if (pArithDecoder->IsComplete()) {
175 return nullptr;
176 }
177 LTP = LTP ^ pArithDecoder->Decode(&grContexts[0x0010]);
178 }
179 uint32_t line1 = (h > 0) ? UNSAFE_TODO(pLine[-nStride]) << 4 : 0;
180 int32_t reference_h = h - GRREFERENCEDY;
181 bool line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
182 bool line2_r_ok = (reference_h > -1 && reference_h < GRHR);
183 bool line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
184 uint32_t line1_r = line1_r_ok ? UNSAFE_TODO(pLineR[nOffset - nStrideR]) : 0;
185 uint32_t line2_r = line2_r_ok ? UNSAFE_TODO(pLineR[nOffset]) : 0;
186 uint32_t line3_r = line3_r_ok ? UNSAFE_TODO(pLineR[nOffset + nStrideR]) : 0;
187 if (!LTP) {
188 uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
189 ((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
190 for (int32_t w = 0; w < iGRW; w += 8) {
191 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
192 if (h > 0) {
193 line1 =
194 (line1 << 8) |
195 (w + 8 < iGRW ? UNSAFE_TODO(pLine[-nStride + (w >> 3) + 1]) << 4
196 : 0);
197 }
198 if (h > GRHR + GRREFERENCEDY + 1) {
199 line1_r = 0;
200 line2_r = 0;
201 line3_r = 0;
202 } else {
203 if (line1_r_ok) {
204 line1_r =
205 (line1_r << 8) |
206 (w + 8 < GRWR
207 ? UNSAFE_TODO(pLineR[nOffset - nStrideR + (w >> 3) + 1])
208 : 0);
209 }
210 if (line2_r_ok) {
211 line2_r =
212 (line2_r << 8) |
213 (w + 8 < GRWR ? UNSAFE_TODO(pLineR[nOffset + (w >> 3) + 1])
214 : 0);
215 }
216 if (line3_r_ok) {
217 line3_r =
218 (line3_r << 8) |
219 (w + 8 < GRWR
220 ? UNSAFE_TODO(pLineR[nOffset + nStrideR + (w >> 3) + 1])
221 : 0);
222 } else {
223 line3_r = 0;
224 }
225 }
226 uint8_t cVal = 0;
227 for (int32_t k = 0; k < nBits; k++) {
228 int bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
229 cVal |= bVal << (7 - k);
230 CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
231 ((line1 >> (7 - k)) & 0x0400) |
232 ((line1_r >> (7 - k)) & 0x0040) |
233 ((line2_r >> (10 - k)) & 0x0008) |
234 ((line3_r >> (13 - k)) & 0x0001);
235 }
236 UNSAFE_TODO(pLine[w >> 3] = cVal);
237 }
238 } else {
239 uint32_t CONTEXT = (line1 & 0x1c00) | (line1_r & 0x01c0) |
240 ((line2_r >> 3) & 0x0038) | ((line3_r >> 6) & 0x0007);
241 for (int32_t w = 0; w < iGRW; w += 8) {
242 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
243 if (h > 0) {
244 line1 =
245 (line1 << 8) |
246 (w + 8 < iGRW ? UNSAFE_TODO(pLine[-nStride + (w >> 3) + 1]) << 4
247 : 0);
248 }
249 if (line1_r_ok) {
250 line1_r =
251 (line1_r << 8) |
252 (w + 8 < GRWR
253 ? UNSAFE_TODO(pLineR[nOffset - nStrideR + (w >> 3) + 1])
254 : 0);
255 }
256 if (line2_r_ok) {
257 line2_r =
258 (line2_r << 8) |
259 (w + 8 < GRWR ? UNSAFE_TODO(pLineR[nOffset + (w >> 3) + 1]) : 0);
260 }
261 if (line3_r_ok) {
262 line3_r =
263 (line3_r << 8) |
264 (w + 8 < GRWR
265 ? UNSAFE_TODO(pLineR[nOffset + nStrideR + (w >> 3) + 1])
266 : 0);
267 } else {
268 line3_r = 0;
269 }
270 uint8_t cVal = 0;
271 for (int32_t k = 0; k < nBits; k++) {
272 int bVal = GRREFERENCE->GetPixel(w + k, h);
273 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w + k - 1, h - 1)) &&
274 (bVal == GRREFERENCE->GetPixel(w + k, h - 1)) &&
275 (bVal == GRREFERENCE->GetPixel(w + k + 1, h - 1)) &&
276 (bVal == GRREFERENCE->GetPixel(w + k - 1, h)) &&
277 (bVal == GRREFERENCE->GetPixel(w + k + 1, h)) &&
278 (bVal == GRREFERENCE->GetPixel(w + k - 1, h + 1)) &&
279 (bVal == GRREFERENCE->GetPixel(w + k, h + 1)) &&
280 (bVal == GRREFERENCE->GetPixel(w + k + 1, h + 1)))) {
281 if (pArithDecoder->IsComplete())
282 return nullptr;
283
284 bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
285 }
286 cVal |= bVal << (7 - k);
287 CONTEXT = ((CONTEXT & 0x0cdb) << 1) | (bVal << 9) |
288 ((line1 >> (7 - k)) & 0x0400) |
289 ((line1_r >> (7 - k)) & 0x0040) |
290 ((line2_r >> (10 - k)) & 0x0008) |
291 ((line3_r >> (13 - k)) & 0x0001);
292 }
293 UNSAFE_TODO(pLine[w >> 3] = cVal);
294 }
295 }
296 UNSAFE_TODO(pLine += nStride);
297 if (h < GRHR + GRREFERENCEDY) {
298 UNSAFE_TODO(pLineR += nStrideR);
299 }
300 }
301 return GRREG;
302}
303
304std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate1Unopt(
305 CJBig2_ArithDecoder* pArithDecoder,
306 pdfium::span<JBig2ArithCtx> grContexts) {
307 auto GRREG = std::make_unique<CJBig2_Image>(GRW, GRH);
308 if (!GRREG->data())
309 return nullptr;
310
311 GRREG->Fill(false);
312 int LTP = 0;
313 for (uint32_t h = 0; h < GRH; h++) {
314 if (TPGRON) {
315 if (pArithDecoder->IsComplete()) {
316 return nullptr;
317 }
318 LTP = LTP ^ pArithDecoder->Decode(&grContexts[0x0008]);
319 }
320 if (!LTP) {
321 uint32_t line1 = GRREG->GetPixel(1, h - 1);
322 line1 |= GRREG->GetPixel(0, h - 1) << 1;
323 line1 |= GRREG->GetPixel(-1, h - 1) << 2;
324 uint32_t line2 = 0;
325 uint32_t line3 =
326 GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
327 uint32_t line4 =
328 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
329 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
330 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
331 << 2;
332 uint32_t line5 =
333 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
334 line5 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
335 << 1;
336 for (uint32_t w = 0; w < GRW; w++) {
337 uint32_t CONTEXT = line5;
338 CONTEXT |= line4 << 2;
339 CONTEXT |= line3 << 5;
340 CONTEXT |= line2 << 6;
341 CONTEXT |= line1 << 7;
342 if (pArithDecoder->IsComplete()) {
343 return nullptr;
344 }
345 int bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
346 GRREG->SetPixel(w, h, bVal);
347 line1 = ((line1 << 1) | GRREG->GetPixel(w + 2, h - 1)) & 0x07;
348 line2 = ((line2 << 1) | bVal) & 0x01;
349 line3 = ((line3 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 1,
350 h - GRREFERENCEDY - 1)) &
351 0x01;
352 line4 = ((line4 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
353 h - GRREFERENCEDY)) &
354 0x07;
355 line5 = ((line5 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
356 h - GRREFERENCEDY + 1)) &
357 0x03;
358 }
359 } else {
360 uint32_t line1 = GRREG->GetPixel(1, h - 1);
361 line1 |= GRREG->GetPixel(0, h - 1) << 1;
362 line1 |= GRREG->GetPixel(-1, h - 1) << 2;
363 uint32_t line2 = 0;
364 uint32_t line3 =
365 GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY - 1);
366 uint32_t line4 =
367 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY);
368 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY) << 1;
369 line4 |= GRREFERENCE->GetPixel(-GRREFERENCEDX - 1, h - GRREFERENCEDY)
370 << 2;
371 uint32_t line5 =
372 GRREFERENCE->GetPixel(-GRREFERENCEDX + 1, h - GRREFERENCEDY + 1);
373 line5 |= GRREFERENCE->GetPixel(-GRREFERENCEDX, h - GRREFERENCEDY + 1)
374 << 1;
375 for (uint32_t w = 0; w < GRW; w++) {
376 int bVal = GRREFERENCE->GetPixel(w, h);
377 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w - 1, h - 1)) &&
378 (bVal == GRREFERENCE->GetPixel(w, h - 1)) &&
379 (bVal == GRREFERENCE->GetPixel(w + 1, h - 1)) &&
380 (bVal == GRREFERENCE->GetPixel(w - 1, h)) &&
381 (bVal == GRREFERENCE->GetPixel(w + 1, h)) &&
382 (bVal == GRREFERENCE->GetPixel(w - 1, h + 1)) &&
383 (bVal == GRREFERENCE->GetPixel(w, h + 1)) &&
384 (bVal == GRREFERENCE->GetPixel(w + 1, h + 1)))) {
385 uint32_t CONTEXT = line5;
386 CONTEXT |= line4 << 2;
387 CONTEXT |= line3 << 5;
388 CONTEXT |= line2 << 6;
389 CONTEXT |= line1 << 7;
390 if (pArithDecoder->IsComplete()) {
391 return nullptr;
392 }
393 bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
394 }
395 GRREG->SetPixel(w, h, bVal);
396 line1 = ((line1 << 1) | GRREG->GetPixel(w + 2, h - 1)) & 0x07;
397 line2 = ((line2 << 1) | bVal) & 0x01;
398 line3 = ((line3 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 1,
399 h - GRREFERENCEDY - 1)) &
400 0x01;
401 line4 = ((line4 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
402 h - GRREFERENCEDY)) &
403 0x07;
404 line5 = ((line5 << 1) | GRREFERENCE->GetPixel(w - GRREFERENCEDX + 2,
405 h - GRREFERENCEDY + 1)) &
406 0x03;
407 }
408 }
409 }
410 return GRREG;
411}
412
413std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::DecodeTemplate1Opt(
414 CJBig2_ArithDecoder* pArithDecoder,
415 pdfium::span<JBig2ArithCtx> grContexts) {
416 if (!GRREFERENCE->data())
417 return nullptr;
418
419 int32_t iGRW = static_cast<int32_t>(GRW);
420 int32_t iGRH = static_cast<int32_t>(GRH);
421 auto GRREG = std::make_unique<CJBig2_Image>(iGRW, iGRH);
422 if (!GRREG->data())
423 return nullptr;
424
425 int LTP = 0;
426 uint8_t* pLine = GRREG->data();
427 uint8_t* pLineR = GRREFERENCE->data();
428 intptr_t nStride = GRREG->stride();
429 intptr_t nStrideR = GRREFERENCE->stride();
430 int32_t GRWR = GRREFERENCE->width();
431 int32_t GRHR = GRREFERENCE->height();
432 if (GRREFERENCEDY < -GRHR + 1 || GRREFERENCEDY > GRHR - 1) {
433 GRREFERENCEDY = 0;
434 }
435 intptr_t nOffset = -GRREFERENCEDY * nStrideR;
436 for (int32_t h = 0; h < iGRH; h++) {
437 if (TPGRON) {
438 if (pArithDecoder->IsComplete())
439 return nullptr;
440
441 LTP = LTP ^ pArithDecoder->Decode(&grContexts[0x0008]);
442 }
443 uint32_t line1 = (h > 0) ? UNSAFE_TODO(pLine[-nStride]) << 1 : 0;
444 int32_t reference_h = h - GRREFERENCEDY;
445 bool line1_r_ok = (reference_h > 0 && reference_h < GRHR + 1);
446 bool line2_r_ok = (reference_h > -1 && reference_h < GRHR);
447 bool line3_r_ok = (reference_h > -2 && reference_h < GRHR - 1);
448 uint32_t line1_r = line1_r_ok ? UNSAFE_TODO(pLineR[nOffset - nStrideR]) : 0;
449 uint32_t line2_r = line2_r_ok ? UNSAFE_TODO(pLineR[nOffset]) : 0;
450 uint32_t line3_r = line3_r_ok ? UNSAFE_TODO(pLineR[nOffset + nStrideR]) : 0;
451 if (!LTP) {
452 uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
453 ((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
454 for (int32_t w = 0; w < iGRW; w += 8) {
455 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
456 if (h > 0)
457 line1 =
458 (line1 << 8) |
459 (w + 8 < iGRW ? UNSAFE_TODO(pLine[-nStride + (w >> 3) + 1]) << 1
460 : 0);
461 if (line1_r_ok)
462 line1_r =
463 (line1_r << 8) |
464 (w + 8 < GRWR
465 ? UNSAFE_TODO(pLineR[nOffset - nStrideR + (w >> 3) + 1])
466 : 0);
467 if (line2_r_ok)
468 line2_r =
469 (line2_r << 8) |
470 (w + 8 < GRWR ? UNSAFE_TODO(pLineR[nOffset + (w >> 3) + 1]) : 0);
471 if (line3_r_ok) {
472 line3_r =
473 (line3_r << 8) |
474 (w + 8 < GRWR
475 ? UNSAFE_TODO(pLineR[nOffset + nStrideR + (w >> 3) + 1])
476 : 0);
477 } else {
478 line3_r = 0;
479 }
480 uint8_t cVal = 0;
481 for (int32_t k = 0; k < nBits; k++) {
482 int bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
483 cVal |= bVal << (7 - k);
484 CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
485 ((line1 >> (7 - k)) & 0x0080) |
486 ((line1_r >> (9 - k)) & 0x0020) |
487 ((line2_r >> (11 - k)) & 0x0004) |
488 ((line3_r >> (13 - k)) & 0x0001);
489 }
490 UNSAFE_TODO(pLine[w >> 3] = cVal);
491 }
492 } else {
493 uint32_t CONTEXT = (line1 & 0x0380) | ((line1_r >> 2) & 0x0020) |
494 ((line2_r >> 4) & 0x001c) | ((line3_r >> 6) & 0x0003);
495 for (int32_t w = 0; w < iGRW; w += 8) {
496 int32_t nBits = iGRW - w > 8 ? 8 : iGRW - w;
497 if (h > 0)
498 line1 =
499 (line1 << 8) |
500 (w + 8 < iGRW ? UNSAFE_TODO(pLine[-nStride + (w >> 3) + 1]) << 1
501 : 0);
502 if (line1_r_ok)
503 line1_r =
504 (line1_r << 8) |
505 (w + 8 < GRWR
506 ? UNSAFE_TODO(pLineR[nOffset - nStrideR + (w >> 3) + 1])
507 : 0);
508 if (line2_r_ok)
509 line2_r =
510 (line2_r << 8) |
511 (w + 8 < GRWR ? UNSAFE_TODO(pLineR[nOffset + (w >> 3) + 1]) : 0);
512 if (line3_r_ok) {
513 line3_r =
514 (line3_r << 8) |
515 (w + 8 < GRWR
516 ? UNSAFE_TODO(pLineR[nOffset + nStrideR + (w >> 3) + 1])
517 : 0);
518 } else {
519 line3_r = 0;
520 }
521 uint8_t cVal = 0;
522 for (int32_t k = 0; k < nBits; k++) {
523 int bVal = GRREFERENCE->GetPixel(w + k, h);
524 if (!(TPGRON && (bVal == GRREFERENCE->GetPixel(w + k - 1, h - 1)) &&
525 (bVal == GRREFERENCE->GetPixel(w + k, h - 1)) &&
526 (bVal == GRREFERENCE->GetPixel(w + k + 1, h - 1)) &&
527 (bVal == GRREFERENCE->GetPixel(w + k - 1, h)) &&
528 (bVal == GRREFERENCE->GetPixel(w + k + 1, h)) &&
529 (bVal == GRREFERENCE->GetPixel(w + k - 1, h + 1)) &&
530 (bVal == GRREFERENCE->GetPixel(w + k, h + 1)) &&
531 (bVal == GRREFERENCE->GetPixel(w + k + 1, h + 1)))) {
532 if (pArithDecoder->IsComplete())
533 return nullptr;
534
535 bVal = pArithDecoder->Decode(&grContexts[CONTEXT]);
536 }
537 cVal |= bVal << (7 - k);
538 CONTEXT = ((CONTEXT & 0x018d) << 1) | (bVal << 6) |
539 ((line1 >> (7 - k)) & 0x0080) |
540 ((line1_r >> (9 - k)) & 0x0020) |
541 ((line2_r >> (11 - k)) & 0x0004) |
542 ((line3_r >> (13 - k)) & 0x0001);
543 }
544 UNSAFE_TODO(pLine[w >> 3] = cVal);
545 }
546 }
547 UNSAFE_TODO(pLine += nStride);
548 if (h < GRHR + GRREFERENCEDY) {
549 UNSAFE_TODO(pLineR += nStrideR);
550 }
551 }
552 return GRREG;
553}
CJBig2_ArithDecoder
Definition JBig2_ArithDecoder.h:41
CJBig2_ArithDecoder::IsComplete
bool IsComplete() const
Definition JBig2_ArithDecoder.h:48
CJBig2_ArithDecoder::Decode
int Decode(JBig2ArithCtx *pCX)
Definition JBig2_ArithDecoder.cpp:70
CJBig2_GRRDProc
Definition JBig2_GrrdProc.h:22
CJBig2_GRRDProc::GRREFERENCEDY
int32_t GRREFERENCEDY
Definition JBig2_GrrdProc.h:35
CJBig2_GRRDProc::CJBig2_GRRDProc
CJBig2_GRRDProc()
CJBig2_GRRDProc::GRTEMPLATE
bool GRTEMPLATE
Definition JBig2_GrrdProc.h:30
CJBig2_GRRDProc::~CJBig2_GRRDProc
~CJBig2_GRRDProc()
CJBig2_GRRDProc::GRW
uint32_t GRW
Definition JBig2_GrrdProc.h:32
CJBig2_GRRDProc::Decode
std::unique_ptr< CJBig2_Image > Decode(CJBig2_ArithDecoder *pArithDecoder, pdfium::span< JBig2ArithCtx > grContexts)
Definition JBig2_GrrdProc.cpp:20
CJBig2_GRRDProc::TPGRON
bool TPGRON
Definition JBig2_GrrdProc.h:31
CJBig2_GRRDProc::GRH
uint32_t GRH
Definition JBig2_GrrdProc.h:33
CJBig2_Image
Definition JBig2_Image.h:30
CJBig2_Image::SetPixel
void SetPixel(int32_t x, int32_t y, int v)
Definition JBig2_Image.cpp:120
CJBig2_Image::IsValidImageSize
static bool IsValidImageSize(int32_t w, int32_t h)
Definition JBig2_Image.cpp:100
CJBig2_Image::GetPixel
int GetPixel(int32_t x, int32_t y) const
Definition JBig2_Image.cpp:104
UNSAFE_TODO
#define UNSAFE_TODO(...)
Definition compiler_specific.h:102