1 // Copyright 2014 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 <algorithm> 8 #include <limits> 9 #include <memory> 10 #include <utility> 11 #include <vector> 12 13 #include "core/fpdfapi/page/cpdf_colorspace.h" 14 #include "core/fxcodec/codec/ccodec_jpxmodule.h" 15 #include "core/fxcodec/codec/cjpx_decoder.h" 16 #include "core/fxcrt/fx_memory.h" 17 #include "core/fxcrt/fx_safe_types.h" 18 #include "third_party/base/ptr_util.h" 19 #include "third_party/libopenjpeg20/openjpeg.h" 20 #include "third_party/libopenjpeg20/opj_malloc.h" 21 22 namespace { 23 24 void fx_ignore_callback(const char* msg, void* client_data) {} 25 26 opj_stream_t* fx_opj_stream_create_memory_stream(DecodeData* data, 27 OPJ_SIZE_T p_size, 28 OPJ_BOOL p_is_read_stream) { 29 if (!data || !data->src_data || data->src_size <= 0) 30 return nullptr; 31 32 opj_stream_t* stream = opj_stream_create(p_size, p_is_read_stream); 33 if (!stream) 34 return nullptr; 35 36 opj_stream_set_user_data(stream, data, nullptr); 37 opj_stream_set_user_data_length(stream, data->src_size); 38 opj_stream_set_read_function(stream, opj_read_from_memory); 39 opj_stream_set_skip_function(stream, opj_skip_from_memory); 40 opj_stream_set_seek_function(stream, opj_seek_from_memory); 41 return stream; 42 } 43 44 void sycc_to_rgb(int offset, 45 int upb, 46 int y, 47 int cb, 48 int cr, 49 int* out_r, 50 int* out_g, 51 int* out_b) { 52 cb -= offset; 53 cr -= offset; 54 *out_r = pdfium::clamp(y + static_cast<int>(1.402 * cr), 0, upb); 55 *out_g = pdfium::clamp(y - static_cast<int>(0.344 * cb + 0.714 * cr), 0, upb); 56 *out_b = pdfium::clamp(y + static_cast<int>(1.772 * cb), 0, upb); 57 } 58 59 void sycc444_to_rgb(opj_image_t* img) { 60 int prec = img->comps[0].prec; 61 // If we shift 31 we're going to go negative, then things go bad. 62 if (prec > 30) 63 return; 64 int offset = 1 << (prec - 1); 65 int upb = (1 << prec) - 1; 66 OPJ_UINT32 maxw = 67 std::min({img->comps[0].w, img->comps[1].w, img->comps[2].w}); 68 OPJ_UINT32 maxh = 69 std::min({img->comps[0].h, img->comps[1].h, img->comps[2].h}); 70 FX_SAFE_SIZE_T max_size = maxw; 71 max_size *= maxh; 72 max_size *= sizeof(int); 73 if (!max_size.IsValid()) 74 return; 75 76 const int* y = img->comps[0].data; 77 const int* cb = img->comps[1].data; 78 const int* cr = img->comps[2].data; 79 if (!y || !cb || !cr) 80 return; 81 82 int* r = static_cast<int*>(opj_image_data_alloc(max_size.ValueOrDie())); 83 int* g = static_cast<int*>(opj_image_data_alloc(max_size.ValueOrDie())); 84 int* b = static_cast<int*>(opj_image_data_alloc(max_size.ValueOrDie())); 85 int* d0 = r; 86 int* d1 = g; 87 int* d2 = b; 88 max_size /= sizeof(int); 89 for (size_t i = 0; i < max_size.ValueOrDie(); ++i) { 90 sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++); 91 } 92 opj_image_data_free(img->comps[0].data); 93 opj_image_data_free(img->comps[1].data); 94 opj_image_data_free(img->comps[2].data); 95 img->comps[0].data = d0; 96 img->comps[1].data = d1; 97 img->comps[2].data = d2; 98 } 99 100 bool sycc420_422_size_is_valid(opj_image_t* img) { 101 return img && img->comps[0].w != std::numeric_limits<OPJ_UINT32>::max() && 102 (img->comps[0].w + 1) / 2 == img->comps[1].w && 103 img->comps[1].w == img->comps[2].w && 104 img->comps[1].h == img->comps[2].h; 105 } 106 107 bool sycc420_size_is_valid(opj_image_t* img) { 108 return sycc420_422_size_is_valid(img) && 109 img->comps[0].h != std::numeric_limits<OPJ_UINT32>::max() && 110 (img->comps[0].h + 1) / 2 == img->comps[1].h; 111 } 112 113 bool sycc422_size_is_valid(opj_image_t* img) { 114 return sycc420_422_size_is_valid(img) && img->comps[0].h == img->comps[1].h; 115 } 116 117 void sycc422_to_rgb(opj_image_t* img) { 118 if (!sycc422_size_is_valid(img)) 119 return; 120 121 int prec = img->comps[0].prec; 122 if (prec <= 0 || prec >= 32) 123 return; 124 125 int offset = 1 << (prec - 1); 126 int upb = (1 << prec) - 1; 127 OPJ_UINT32 maxw = img->comps[0].w; 128 OPJ_UINT32 maxh = img->comps[0].h; 129 FX_SAFE_SIZE_T max_size = maxw; 130 max_size *= maxh; 131 max_size *= sizeof(int); 132 if (!max_size.IsValid()) 133 return; 134 135 const int* y = img->comps[0].data; 136 const int* cb = img->comps[1].data; 137 const int* cr = img->comps[2].data; 138 if (!y || !cb || !cr) 139 return; 140 141 int* r = static_cast<int*>(opj_image_data_alloc(max_size.ValueOrDie())); 142 int* g = static_cast<int*>(opj_image_data_alloc(max_size.ValueOrDie())); 143 int* b = static_cast<int*>(opj_image_data_alloc(max_size.ValueOrDie())); 144 int* d0 = r; 145 int* d1 = g; 146 int* d2 = b; 147 for (uint32_t i = 0; i < maxh; ++i) { 148 OPJ_UINT32 j; 149 for (j = 0; j < (maxw & ~static_cast<OPJ_UINT32>(1)); j += 2) { 150 sycc_to_rgb(offset, upb, *y++, *cb, *cr, r++, g++, b++); 151 sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++); 152 } 153 if (j < maxw) { 154 sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++); 155 } 156 } 157 opj_image_data_free(img->comps[0].data); 158 opj_image_data_free(img->comps[1].data); 159 opj_image_data_free(img->comps[2].data); 160 img->comps[0].data = d0; 161 img->comps[1].data = d1; 162 img->comps[2].data = d2; 163 img->comps[1].w = maxw; 164 img->comps[1].h = maxh; 165 img->comps[2].w = maxw; 166 img->comps[2].h = maxh; 167 img->comps[1].dx = img->comps[0].dx; 168 img->comps[2].dx = img->comps[0].dx; 169 img->comps[1].dy = img->comps[0].dy; 170 img->comps[2].dy = img->comps[0].dy; 171 } 172 173 bool sycc420_must_extend_cbcr(OPJ_UINT32 y, OPJ_UINT32 cbcr) { 174 return (y & 1) && (cbcr == y / 2); 175 } 176 177 bool is_sycc420(const opj_image_t* img) { 178 return img->comps[0].dx == 1 && img->comps[0].dy == 1 && 179 img->comps[1].dx == 2 && img->comps[1].dy == 2 && 180 img->comps[2].dx == 2 && img->comps[2].dy == 2; 181 } 182 183 bool is_sycc422(const opj_image_t* img) { 184 return img->comps[0].dx == 1 && img->comps[0].dy == 1 && 185 img->comps[1].dx == 2 && img->comps[1].dy == 1 && 186 img->comps[2].dx == 2 && img->comps[2].dy == 1; 187 } 188 189 bool is_sycc444(const opj_image_t* img) { 190 return img->comps[0].dx == 1 && img->comps[0].dy == 1 && 191 img->comps[1].dx == 1 && img->comps[1].dy == 1 && 192 img->comps[2].dx == 1 && img->comps[2].dy == 1; 193 } 194 195 void color_sycc_to_rgb(opj_image_t* img) { 196 if (img->numcomps < 3) { 197 img->color_space = OPJ_CLRSPC_GRAY; 198 return; 199 } 200 if (is_sycc420(img)) 201 sycc420_to_rgb(img); 202 else if (is_sycc422(img)) 203 sycc422_to_rgb(img); 204 else if (is_sycc444(img)) 205 sycc444_to_rgb(img); 206 else 207 return; 208 209 img->color_space = OPJ_CLRSPC_SRGB; 210 } 211 212 } // namespace 213 214 OPJ_SIZE_T opj_read_from_memory(void* p_buffer, 215 OPJ_SIZE_T nb_bytes, 216 void* p_user_data) { 217 DecodeData* srcData = static_cast<DecodeData*>(p_user_data); 218 if (!srcData || !srcData->src_data || srcData->src_size == 0) 219 return static_cast<OPJ_SIZE_T>(-1); 220 221 // Reads at EOF return an error code. 222 if (srcData->offset >= srcData->src_size) 223 return static_cast<OPJ_SIZE_T>(-1); 224 225 OPJ_SIZE_T bufferLength = srcData->src_size - srcData->offset; 226 OPJ_SIZE_T readlength = nb_bytes < bufferLength ? nb_bytes : bufferLength; 227 memcpy(p_buffer, &srcData->src_data[srcData->offset], readlength); 228 srcData->offset += readlength; 229 return readlength; 230 } 231 232 OPJ_OFF_T opj_skip_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) { 233 DecodeData* srcData = static_cast<DecodeData*>(p_user_data); 234 if (!srcData || !srcData->src_data || srcData->src_size == 0) 235 return static_cast<OPJ_OFF_T>(-1); 236 237 // Offsets are signed and may indicate a negative skip. Do not support this 238 // because of the strange return convention where either bytes skipped or 239 // -1 is returned. Following that convention, a successful relative seek of 240 // -1 bytes would be required to to give the same result as the error case. 241 if (nb_bytes < 0) 242 return static_cast<OPJ_OFF_T>(-1); 243 244 // FIXME: use std::make_unsigned<OPJ_OFF_T>::type once c++11 lib is OK'd. 245 uint64_t unsignedNbBytes = static_cast<uint64_t>(nb_bytes); 246 // Additionally, the offset may take us beyond the range of a size_t (e.g. 247 // 32-bit platforms). If so, just clamp at EOF. 248 if (unsignedNbBytes > 249 std::numeric_limits<OPJ_SIZE_T>::max() - srcData->offset) { 250 srcData->offset = srcData->src_size; 251 } else { 252 OPJ_SIZE_T checkedNbBytes = static_cast<OPJ_SIZE_T>(unsignedNbBytes); 253 // Otherwise, mimic fseek() semantics to always succeed, even past EOF, 254 // clamping at EOF. We can get away with this since we don't actually 255 // provide negative relative skips from beyond EOF back to inside the 256 // data, which would be the only reason to need to know exactly how far 257 // beyond EOF we are. 258 srcData->offset = 259 std::min(srcData->offset + checkedNbBytes, srcData->src_size); 260 } 261 return nb_bytes; 262 } 263 264 OPJ_BOOL opj_seek_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) { 265 DecodeData* srcData = static_cast<DecodeData*>(p_user_data); 266 if (!srcData || !srcData->src_data || srcData->src_size == 0) 267 return OPJ_FALSE; 268 269 // Offsets are signed and may indicate a negative position, which would 270 // be before the start of the file. Do not support this. 271 if (nb_bytes < 0) 272 return OPJ_FALSE; 273 274 // FIXME: use std::make_unsigned<OPJ_OFF_T>::type once c++11 lib is OK'd. 275 uint64_t unsignedNbBytes = static_cast<uint64_t>(nb_bytes); 276 // Additionally, the offset may take us beyond the range of a size_t (e.g. 277 // 32-bit platforms). If so, just clamp at EOF. 278 if (unsignedNbBytes > std::numeric_limits<OPJ_SIZE_T>::max()) { 279 srcData->offset = srcData->src_size; 280 } else { 281 OPJ_SIZE_T checkedNbBytes = static_cast<OPJ_SIZE_T>(nb_bytes); 282 // Otherwise, mimic fseek() semantics to always succeed, even past EOF, 283 // again clamping at EOF. 284 srcData->offset = std::min(checkedNbBytes, srcData->src_size); 285 } 286 return OPJ_TRUE; 287 } 288 289 void sycc420_to_rgb(opj_image_t* img) { 290 if (!sycc420_size_is_valid(img)) 291 return; 292 293 OPJ_UINT32 prec = img->comps[0].prec; 294 if (!prec) 295 return; 296 297 OPJ_UINT32 offset = 1 << (prec - 1); 298 OPJ_UINT32 upb = (1 << prec) - 1; 299 OPJ_UINT32 yw = img->comps[0].w; 300 OPJ_UINT32 yh = img->comps[0].h; 301 OPJ_UINT32 cbw = img->comps[1].w; 302 OPJ_UINT32 cbh = img->comps[1].h; 303 OPJ_UINT32 crw = img->comps[2].w; 304 bool extw = sycc420_must_extend_cbcr(yw, cbw); 305 bool exth = sycc420_must_extend_cbcr(yh, cbh); 306 FX_SAFE_UINT32 safeSize = yw; 307 safeSize *= yh; 308 safeSize *= sizeof(int); 309 if (!safeSize.IsValid()) 310 return; 311 312 int* r = static_cast<int*>(opj_image_data_alloc(safeSize.ValueOrDie())); 313 int* g = static_cast<int*>(opj_image_data_alloc(safeSize.ValueOrDie())); 314 int* b = static_cast<int*>(opj_image_data_alloc(safeSize.ValueOrDie())); 315 int* d0 = r; 316 int* d1 = g; 317 int* d2 = b; 318 const int* y = img->comps[0].data; 319 const int* cb = img->comps[1].data; 320 const int* cr = img->comps[2].data; 321 if (!y || !cb || !cr) 322 return; 323 324 const int* ny = nullptr; 325 int* nr = nullptr; 326 int* ng = nullptr; 327 int* nb = nullptr; 328 OPJ_UINT32 i = 0; 329 OPJ_UINT32 j = 0; 330 for (i = 0; i < (yh & ~(OPJ_UINT32)1); i += 2) { 331 ny = y + yw; 332 nr = r + yw; 333 ng = g + yw; 334 nb = b + yw; 335 for (j = 0; j < (yw & ~(OPJ_UINT32)1); j += 2) { 336 sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b); 337 ++y; 338 ++r; 339 ++g; 340 ++b; 341 sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b); 342 ++y; 343 ++r; 344 ++g; 345 ++b; 346 sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb); 347 ++ny; 348 ++nr; 349 ++ng; 350 ++nb; 351 sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb); 352 ++ny; 353 ++nr; 354 ++ng; 355 ++nb; 356 ++cb; 357 ++cr; 358 } 359 if (j < yw) { 360 if (extw) { 361 --cb; 362 --cr; 363 } 364 sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b); 365 ++y; 366 ++r; 367 ++g; 368 ++b; 369 sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb); 370 ++ny; 371 ++nr; 372 ++ng; 373 ++nb; 374 ++cb; 375 ++cr; 376 } 377 y += yw; 378 r += yw; 379 g += yw; 380 b += yw; 381 } 382 if (i < yh) { 383 if (exth) { 384 cb -= cbw; 385 cr -= crw; 386 } 387 for (j = 0; j < (yw & ~(OPJ_UINT32)1); j += 2) { 388 sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b); 389 ++y; 390 ++r; 391 ++g; 392 ++b; 393 sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b); 394 ++y; 395 ++r; 396 ++g; 397 ++b; 398 ++cb; 399 ++cr; 400 } 401 if (j < yw) { 402 if (extw) { 403 --cb; 404 --cr; 405 } 406 sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b); 407 } 408 } 409 410 opj_image_data_free(img->comps[0].data); 411 opj_image_data_free(img->comps[1].data); 412 opj_image_data_free(img->comps[2].data); 413 img->comps[0].data = d0; 414 img->comps[1].data = d1; 415 img->comps[2].data = d2; 416 img->comps[1].w = yw; 417 img->comps[1].h = yh; 418 img->comps[2].w = yw; 419 img->comps[2].h = yh; 420 img->comps[1].w = yw; 421 img->comps[1].h = yh; 422 img->comps[2].w = yw; 423 img->comps[2].h = yh; 424 img->comps[1].dx = img->comps[0].dx; 425 img->comps[2].dx = img->comps[0].dx; 426 img->comps[1].dy = img->comps[0].dy; 427 img->comps[2].dy = img->comps[0].dy; 428 } 429 430 CJPX_Decoder::CJPX_Decoder(CPDF_ColorSpace* cs) 431 : m_Image(nullptr), 432 m_Codec(nullptr), 433 m_DecodeData(nullptr), 434 m_Stream(nullptr), 435 m_ColorSpace(cs) {} 436 437 CJPX_Decoder::~CJPX_Decoder() { 438 if (m_Codec) 439 opj_destroy_codec(m_Codec); 440 if (m_Stream) 441 opj_stream_destroy(m_Stream); 442 if (m_Image) 443 opj_image_destroy(m_Image); 444 } 445 446 bool CJPX_Decoder::Init(const unsigned char* src_data, uint32_t src_size) { 447 static const unsigned char szJP2Header[] = { 448 0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a}; 449 if (!src_data || src_size < sizeof(szJP2Header)) 450 return false; 451 452 m_Image = nullptr; 453 m_SrcData = src_data; 454 m_SrcSize = src_size; 455 m_DecodeData = pdfium::MakeUnique<DecodeData>( 456 const_cast<unsigned char*>(src_data), src_size); 457 m_Stream = fx_opj_stream_create_memory_stream( 458 m_DecodeData.get(), static_cast<unsigned int>(OPJ_J2K_STREAM_CHUNK_SIZE), 459 1); 460 if (!m_Stream) 461 return false; 462 463 opj_set_default_decoder_parameters(&m_Parameters); 464 m_Parameters.decod_format = 0; 465 m_Parameters.cod_format = 3; 466 if (memcmp(m_SrcData, szJP2Header, sizeof(szJP2Header)) == 0) { 467 m_Codec = opj_create_decompress(OPJ_CODEC_JP2); 468 m_Parameters.decod_format = 1; 469 } else { 470 m_Codec = opj_create_decompress(OPJ_CODEC_J2K); 471 } 472 if (!m_Codec) 473 return false; 474 475 if (m_ColorSpace && m_ColorSpace->GetFamily() == PDFCS_INDEXED) 476 m_Parameters.flags |= OPJ_DPARAMETERS_IGNORE_PCLR_CMAP_CDEF_FLAG; 477 opj_set_info_handler(m_Codec, fx_ignore_callback, nullptr); 478 opj_set_warning_handler(m_Codec, fx_ignore_callback, nullptr); 479 opj_set_error_handler(m_Codec, fx_ignore_callback, nullptr); 480 if (!opj_setup_decoder(m_Codec, &m_Parameters)) 481 return false; 482 483 if (!opj_read_header(m_Stream, m_Codec, &m_Image)) { 484 m_Image = nullptr; 485 return false; 486 } 487 m_Image->pdfium_use_colorspace = !!m_ColorSpace; 488 489 if (!m_Parameters.nb_tile_to_decode) { 490 if (!opj_set_decode_area(m_Codec, m_Image, m_Parameters.DA_x0, 491 m_Parameters.DA_y0, m_Parameters.DA_x1, 492 m_Parameters.DA_y1)) { 493 opj_image_destroy(m_Image); 494 m_Image = nullptr; 495 return false; 496 } 497 if (!(opj_decode(m_Codec, m_Stream, m_Image) && 498 opj_end_decompress(m_Codec, m_Stream))) { 499 opj_image_destroy(m_Image); 500 m_Image = nullptr; 501 return false; 502 } 503 } else if (!opj_get_decoded_tile(m_Codec, m_Stream, m_Image, 504 m_Parameters.tile_index)) { 505 return false; 506 } 507 508 opj_stream_destroy(m_Stream); 509 m_Stream = nullptr; 510 if (m_Image->color_space != OPJ_CLRSPC_SYCC && m_Image->numcomps == 3 && 511 m_Image->comps[0].dx == m_Image->comps[0].dy && 512 m_Image->comps[1].dx != 1) { 513 m_Image->color_space = OPJ_CLRSPC_SYCC; 514 } else if (m_Image->numcomps <= 2) { 515 m_Image->color_space = OPJ_CLRSPC_GRAY; 516 } 517 if (m_Image->color_space == OPJ_CLRSPC_SYCC) 518 color_sycc_to_rgb(m_Image); 519 520 if (m_Image->icc_profile_buf) { 521 // TODO(palmer): Using |opj_free| here resolves the crash described in 522 // https://crbug.com/737033, but ultimately we need to harmonize the 523 // memory allocation strategy across OpenJPEG and its PDFium callers. 524 opj_free(m_Image->icc_profile_buf); 525 m_Image->icc_profile_buf = nullptr; 526 m_Image->icc_profile_len = 0; 527 } 528 529 return true; 530 } 531 532 void CJPX_Decoder::GetInfo(uint32_t* width, 533 uint32_t* height, 534 uint32_t* components) { 535 *width = m_Image->x1; 536 *height = m_Image->y1; 537 *components = m_Image->numcomps; 538 } 539 540 bool CJPX_Decoder::Decode(uint8_t* dest_buf, 541 int pitch, 542 const std::vector<uint8_t>& offsets) { 543 if (m_Image->comps[0].w != m_Image->x1 || m_Image->comps[0].h != m_Image->y1) 544 return false; 545 546 if (pitch<static_cast<int>(m_Image->comps[0].w * 8 * m_Image->numcomps + 31)>> 547 5 << 2) { 548 return false; 549 } 550 551 memset(dest_buf, 0xff, m_Image->y1 * pitch); 552 std::vector<uint8_t*> channel_bufs(m_Image->numcomps); 553 std::vector<int> adjust_comps(m_Image->numcomps); 554 for (uint32_t i = 0; i < m_Image->numcomps; i++) { 555 channel_bufs[i] = dest_buf + offsets[i]; 556 adjust_comps[i] = m_Image->comps[i].prec - 8; 557 if (i > 0) { 558 if (m_Image->comps[i].dx != m_Image->comps[i - 1].dx || 559 m_Image->comps[i].dy != m_Image->comps[i - 1].dy || 560 m_Image->comps[i].prec != m_Image->comps[i - 1].prec) { 561 return false; 562 } 563 } 564 } 565 int width = m_Image->comps[0].w; 566 int height = m_Image->comps[0].h; 567 for (uint32_t channel = 0; channel < m_Image->numcomps; ++channel) { 568 uint8_t* pChannel = channel_bufs[channel]; 569 if (adjust_comps[channel] < 0) { 570 for (int row = 0; row < height; ++row) { 571 uint8_t* pScanline = pChannel + row * pitch; 572 for (int col = 0; col < width; ++col) { 573 uint8_t* pPixel = pScanline + col * m_Image->numcomps; 574 if (!m_Image->comps[channel].data) 575 continue; 576 577 int src = m_Image->comps[channel].data[row * width + col]; 578 src += m_Image->comps[channel].sgnd 579 ? 1 << (m_Image->comps[channel].prec - 1) 580 : 0; 581 if (adjust_comps[channel] > 0) { 582 *pPixel = 0; 583 } else { 584 *pPixel = static_cast<uint8_t>(src << -adjust_comps[channel]); 585 } 586 } 587 } 588 } else { 589 for (int row = 0; row < height; ++row) { 590 uint8_t* pScanline = pChannel + row * pitch; 591 for (int col = 0; col < width; ++col) { 592 uint8_t* pPixel = pScanline + col * m_Image->numcomps; 593 if (!m_Image->comps[channel].data) 594 continue; 595 596 int src = m_Image->comps[channel].data[row * width + col]; 597 src += m_Image->comps[channel].sgnd 598 ? 1 << (m_Image->comps[channel].prec - 1) 599 : 0; 600 if (adjust_comps[channel] - 1 < 0) { 601 *pPixel = static_cast<uint8_t>((src >> adjust_comps[channel])); 602 } else { 603 int tmpPixel = (src >> adjust_comps[channel]) + 604 ((src >> (adjust_comps[channel] - 1)) % 2); 605 tmpPixel = pdfium::clamp(tmpPixel, 0, 255); 606 *pPixel = static_cast<uint8_t>(tmpPixel); 607 } 608 } 609 } 610 } 611 } 612 return true; 613 } 614 615 CCodec_JpxModule::CCodec_JpxModule() {} 616 617 CCodec_JpxModule::~CCodec_JpxModule() {} 618 619 std::unique_ptr<CJPX_Decoder> CCodec_JpxModule::CreateDecoder( 620 const uint8_t* src_buf, 621 uint32_t src_size, 622 CPDF_ColorSpace* cs) { 623 auto decoder = pdfium::MakeUnique<CJPX_Decoder>(cs); 624 return decoder->Init(src_buf, src_size) ? std::move(decoder) : nullptr; 625 } 626 627 void CCodec_JpxModule::GetImageInfo(CJPX_Decoder* pDecoder, 628 uint32_t* width, 629 uint32_t* height, 630 uint32_t* components) { 631 pDecoder->GetInfo(width, height, components); 632 } 633 634 bool CCodec_JpxModule::Decode(CJPX_Decoder* pDecoder, 635 uint8_t* dest_data, 636 int pitch, 637 const std::vector<uint8_t>& offsets) { 638 return pDecoder->Decode(dest_data, pitch, offsets); 639 } 640
