| 1 | /* $Header$ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1994-1997 Sam Leffler |
| 5 | * Copyright (c) 1994-1997 Silicon Graphics, Inc. |
| 6 | * |
| 7 | * Permission to use, copy, modify, distribute, and sell this software and |
| 8 | * its documentation for any purpose is hereby granted without fee, provided |
| 9 | * that (i) the above copyright notices and this permission notice appear in |
| 10 | * all copies of the software and related documentation, and (ii) the names of |
| 11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or |
| 12 | * publicity relating to the software without the specific, prior written |
| 13 | * permission of Sam Leffler and Silicon Graphics. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| 17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| 18 | * |
| 19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
| 20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| 21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| 23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 24 | * OF THIS SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #include "tiffiop.h" |
| 28 | #ifdef JPEG_SUPPORT |
| 29 | /* |
| 30 | * TIFF Library |
| 31 | * |
| 32 | * JPEG Compression support per TIFF Technical Note #2 |
| 33 | * (*not* per the original TIFF 6.0 spec). |
| 34 | * |
| 35 | * This file is simply an interface to the libjpeg library written by |
| 36 | * the Independent JPEG Group. You need release 5 or later of the IJG |
| 37 | * code, which you can find on the Internet at ftp.uu.net:/graphics/jpeg/. |
| 38 | * |
| 39 | * Contributed by Tom Lane <tgl@sss.pgh.pa.us>. |
| 40 | */ |
| 41 | #include <assert.h> |
| 42 | #include <stdio.h> |
| 43 | #include <setjmp.h> |
| 44 | #include "jpeglib.h" |
| 45 | #include "jerror.h" |
| 46 | |
| 47 | /* |
| 48 | * On some machines it may be worthwhile to use _setjmp or sigsetjmp |
| 49 | * in place of plain setjmp. These macros will make it easier. |
| 50 | */ |
| 51 | #define SETJMP(jbuf) setjmp(jbuf) |
| 52 | #define LONGJMP(jbuf,code) longjmp(jbuf,code) |
| 53 | #define JMP_BUF jmp_buf |
| 54 | |
| 55 | typedef struct jpeg_destination_mgr jpeg_destination_mgr; |
| 56 | typedef struct jpeg_source_mgr jpeg_source_mgr; |
| 57 | typedef struct jpeg_error_mgr jpeg_error_mgr; |
| 58 | |
| 59 | /* |
| 60 | * State block for each open TIFF file using |
| 61 | * libjpeg to do JPEG compression/decompression. |
| 62 | * |
| 63 | * libjpeg's visible state is either a jpeg_compress_struct |
| 64 | * or jpeg_decompress_struct depending on which way we |
| 65 | * are going. comm can be used to refer to the fields |
| 66 | * which are common to both. |
| 67 | * |
| 68 | * NB: cinfo is required to be the first member of JPEGState, |
| 69 | * so we can safely cast JPEGState* -> jpeg_xxx_struct* |
| 70 | * and vice versa! |
| 71 | */ |
| 72 | typedef struct { |
| 73 | union { |
| 74 | struct jpeg_compress_struct c; |
| 75 | struct jpeg_decompress_struct d; |
| 76 | struct jpeg_common_struct comm; |
| 77 | } cinfo; /* NB: must be first */ |
| 78 | jpeg_error_mgr err; /* libjpeg error manager */ |
| 79 | JMP_BUF exit_jmpbuf; /* for catching libjpeg failures */ |
| 80 | /* |
| 81 | * The following two members could be a union, but |
| 82 | * they're small enough that it's not worth the effort. |
| 83 | */ |
| 84 | jpeg_destination_mgr dest; /* data dest for compression */ |
| 85 | jpeg_source_mgr src; /* data source for decompression */ |
| 86 | /* private state */ |
| 87 | TIFF* tif; /* back link needed by some code */ |
| 88 | uint16 photometric; /* copy of PhotometricInterpretation */ |
| 89 | uint16 h_sampling; /* luminance sampling factors */ |
| 90 | uint16 v_sampling; |
| 91 | tsize_t bytesperline; /* decompressed bytes per scanline */ |
| 92 | /* pointers to intermediate buffers when processing downsampled data */ |
| 93 | JSAMPARRAY ds_buffer[MAX_COMPONENTS]; |
| 94 | int scancount; /* number of "scanlines" accumulated */ |
| 95 | int samplesperclump; |
| 96 | |
| 97 | TIFFVGetMethod vgetparent; /* super-class method */ |
| 98 | TIFFVSetMethod vsetparent; /* super-class method */ |
| 99 | TIFFStripMethod defsparent; /* super-class method */ |
| 100 | TIFFTileMethod deftparent; /* super-class method */ |
| 101 | /* pseudo-tag fields */ |
| 102 | void* jpegtables; /* JPEGTables tag value, or NULL */ |
| 103 | uint32 jpegtables_length; /* number of bytes in same */ |
| 104 | int jpegquality; /* Compression quality level */ |
| 105 | int jpegcolormode; /* Auto RGB<=>YCbCr convert? */ |
| 106 | int jpegtablesmode; /* What to put in JPEGTables */ |
| 107 | } JPEGState; |
| 108 | |
| 109 | #define JState(tif) ((JPEGState*)(tif)->tif_data) |
| 110 | |
| 111 | static int JPEGDecode(TIFF*, tidata_t, tsize_t, tsample_t); |
| 112 | static int JPEGDecodeRaw(TIFF*, tidata_t, tsize_t, tsample_t); |
| 113 | static int JPEGEncode(TIFF*, tidata_t, tsize_t, tsample_t); |
| 114 | static int JPEGEncodeRaw(TIFF*, tidata_t, tsize_t, tsample_t); |
| 115 | |
| 116 | #define FIELD_JPEGTABLES (FIELD_CODEC+0) |
| 117 | |
| 118 | static const TIFFFieldInfo jpegFieldInfo[] = { |
| 119 | { TIFFTAG_JPEGTABLES, -1,-1, TIFF_UNDEFINED, FIELD_JPEGTABLES, |
| 120 | FALSE, TRUE, "JPEGTables" }, |
| 121 | { TIFFTAG_JPEGQUALITY, 0, 0, TIFF_ANY, FIELD_PSEUDO, |
| 122 | TRUE, FALSE, "" }, |
| 123 | { TIFFTAG_JPEGCOLORMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO, |
| 124 | FALSE, FALSE, "" }, |
| 125 | { TIFFTAG_JPEGTABLESMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO, |
| 126 | FALSE, FALSE, "" }, |
| 127 | }; |
| 128 | #define N(a) (sizeof (a) / sizeof (a[0])) |
| 129 | |
| 130 | /* |
| 131 | * libjpeg interface layer. |
| 132 | * |
| 133 | * We use setjmp/longjmp to return control to libtiff |
| 134 | * when a fatal error is encountered within the JPEG |
| 135 | * library. We also direct libjpeg error and warning |
| 136 | * messages through the appropriate libtiff handlers. |
| 137 | */ |
| 138 | |
| 139 | /* |
| 140 | * Error handling routines (these replace corresponding |
| 141 | * IJG routines from jerror.c). These are used for both |
| 142 | * compression and decompression. |
| 143 | */ |
| 144 | static void |
| 145 | TIFFjpeg_error_exit(j_common_ptr cinfo) |
| 146 | { |
| 147 | JPEGState *sp = (JPEGState *) cinfo; /* NB: cinfo assumed first */ |
| 148 | char buffer[JMSG_LENGTH_MAX]; |
| 149 | |
| 150 | (*cinfo->err->format_message) (cinfo, buffer); |
| 151 | TIFFError("JPEGLib", buffer); /* display the error message */ |
| 152 | jpeg_abort(cinfo); /* clean up libjpeg state */ |
| 153 | LONGJMP(sp->exit_jmpbuf, 1); /* return to libtiff caller */ |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * This routine is invoked only for warning messages, |
| 158 | * since error_exit does its own thing and trace_level |
| 159 | * is never set > 0. |
| 160 | */ |
| 161 | static void |
| 162 | TIFFjpeg_output_message(j_common_ptr cinfo) |
| 163 | { |
| 164 | char buffer[JMSG_LENGTH_MAX]; |
| 165 | |
| 166 | (*cinfo->err->format_message) (cinfo, buffer); |
| 167 | TIFFWarning("JPEGLib", buffer); |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * Interface routines. This layer of routines exists |
| 172 | * primarily to limit side-effects from using setjmp. |
| 173 | * Also, normal/error returns are converted into return |
| 174 | * values per libtiff practice. |
| 175 | */ |
| 176 | #define CALLJPEG(sp, fail, op) (SETJMP((sp)->exit_jmpbuf) ? (fail) : (op)) |
| 177 | #define CALLVJPEG(sp, op) CALLJPEG(sp, 0, ((op),1)) |
| 178 | |
| 179 | static int |
| 180 | TIFFjpeg_create_compress(JPEGState* sp) |
| 181 | { |
| 182 | /* initialize JPEG error handling */ |
| 183 | sp->cinfo.c.err = jpeg_std_error(&sp->err); |
| 184 | sp->err.error_exit = TIFFjpeg_error_exit; |
| 185 | sp->err.output_message = TIFFjpeg_output_message; |
| 186 | |
| 187 | return CALLVJPEG(sp, jpeg_create_compress(&sp->cinfo.c)); |
| 188 | } |
| 189 | |
| 190 | static int |
| 191 | TIFFjpeg_create_decompress(JPEGState* sp) |
| 192 | { |
| 193 | /* initialize JPEG error handling */ |
| 194 | sp->cinfo.d.err = jpeg_std_error(&sp->err); |
| 195 | sp->err.error_exit = TIFFjpeg_error_exit; |
| 196 | sp->err.output_message = TIFFjpeg_output_message; |
| 197 | |
| 198 | return CALLVJPEG(sp, jpeg_create_decompress(&sp->cinfo.d)); |
| 199 | } |
| 200 | |
| 201 | static int |
| 202 | TIFFjpeg_set_defaults(JPEGState* sp) |
| 203 | { |
| 204 | return CALLVJPEG(sp, jpeg_set_defaults(&sp->cinfo.c)); |
| 205 | } |
| 206 | |
| 207 | static int |
| 208 | TIFFjpeg_set_colorspace(JPEGState* sp, J_COLOR_SPACE colorspace) |
| 209 | { |
| 210 | return CALLVJPEG(sp, jpeg_set_colorspace(&sp->cinfo.c, colorspace)); |
| 211 | } |
| 212 | |
| 213 | static int |
| 214 | TIFFjpeg_set_quality(JPEGState* sp, int quality, boolean force_baseline) |
| 215 | { |
| 216 | return CALLVJPEG(sp, |
| 217 | jpeg_set_quality(&sp->cinfo.c, quality, force_baseline)); |
| 218 | } |
| 219 | |
| 220 | static int |
| 221 | TIFFjpeg_suppress_tables(JPEGState* sp, boolean suppress) |
| 222 | { |
| 223 | return CALLVJPEG(sp, jpeg_suppress_tables(&sp->cinfo.c, suppress)); |
| 224 | } |
| 225 | |
| 226 | static int |
| 227 | TIFFjpeg_start_compress(JPEGState* sp, boolean write_all_tables) |
| 228 | { |
| 229 | return CALLVJPEG(sp, |
| 230 | jpeg_start_compress(&sp->cinfo.c, write_all_tables)); |
| 231 | } |
| 232 | |
| 233 | static int |
| 234 | TIFFjpeg_write_scanlines(JPEGState* sp, JSAMPARRAY scanlines, int num_lines) |
| 235 | { |
| 236 | return CALLJPEG(sp, -1, (int) jpeg_write_scanlines(&sp->cinfo.c, |
| 237 | scanlines, (JDIMENSION) num_lines)); |
| 238 | } |
| 239 | |
| 240 | static int |
| 241 | TIFFjpeg_write_raw_data(JPEGState* sp, JSAMPIMAGE data, int num_lines) |
| 242 | { |
| 243 | return CALLJPEG(sp, -1, (int) jpeg_write_raw_data(&sp->cinfo.c, |
| 244 | data, (JDIMENSION) num_lines)); |
| 245 | } |
| 246 | |
| 247 | static int |
| 248 | TIFFjpeg_finish_compress(JPEGState* sp) |
| 249 | { |
| 250 | return CALLVJPEG(sp, jpeg_finish_compress(&sp->cinfo.c)); |
| 251 | } |
| 252 | |
| 253 | static int |
| 254 | TIFFjpeg_write_tables(JPEGState* sp) |
| 255 | { |
| 256 | return CALLVJPEG(sp, jpeg_write_tables(&sp->cinfo.c)); |
| 257 | } |
| 258 | |
| 259 | static int |
| 260 | TIFFjpeg_read_header(JPEGState* sp, boolean require_image) |
| 261 | { |
| 262 | return CALLJPEG(sp, -1, jpeg_read_header(&sp->cinfo.d, require_image)); |
| 263 | } |
| 264 | |
| 265 | static int |
| 266 | TIFFjpeg_start_decompress(JPEGState* sp) |
| 267 | { |
| 268 | return CALLVJPEG(sp, jpeg_start_decompress(&sp->cinfo.d)); |
| 269 | } |
| 270 | |
| 271 | static int |
| 272 | TIFFjpeg_read_scanlines(JPEGState* sp, JSAMPARRAY scanlines, int max_lines) |
| 273 | { |
| 274 | return CALLJPEG(sp, -1, (int) jpeg_read_scanlines(&sp->cinfo.d, |
| 275 | scanlines, (JDIMENSION) max_lines)); |
| 276 | } |
| 277 | |
| 278 | static int |
| 279 | TIFFjpeg_read_raw_data(JPEGState* sp, JSAMPIMAGE data, int max_lines) |
| 280 | { |
| 281 | return CALLJPEG(sp, -1, (int) jpeg_read_raw_data(&sp->cinfo.d, |
| 282 | data, (JDIMENSION) max_lines)); |
| 283 | } |
| 284 | |
| 285 | static int |
| 286 | TIFFjpeg_finish_decompress(JPEGState* sp) |
| 287 | { |
| 288 | return CALLJPEG(sp, -1, (int) jpeg_finish_decompress(&sp->cinfo.d)); |
| 289 | } |
| 290 | |
| 291 | static int |
| 292 | TIFFjpeg_abort(JPEGState* sp) |
| 293 | { |
| 294 | return CALLVJPEG(sp, jpeg_abort(&sp->cinfo.comm)); |
| 295 | } |
| 296 | |
| 297 | static int |
| 298 | TIFFjpeg_destroy(JPEGState* sp) |
| 299 | { |
| 300 | return CALLVJPEG(sp, jpeg_destroy(&sp->cinfo.comm)); |
| 301 | } |
| 302 | |
| 303 | static JSAMPARRAY |
| 304 | TIFFjpeg_alloc_sarray(JPEGState* sp, int pool_id, |
| 305 | JDIMENSION samplesperrow, JDIMENSION numrows) |
| 306 | { |
| 307 | return CALLJPEG(sp, (JSAMPARRAY) NULL, |
| 308 | (*sp->cinfo.comm.mem->alloc_sarray) |
| 309 | (&sp->cinfo.comm, pool_id, samplesperrow, numrows)); |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * JPEG library destination data manager. |
| 314 | * These routines direct compressed data from libjpeg into the |
| 315 | * libtiff output buffer. |
| 316 | */ |
| 317 | |
| 318 | static void |
| 319 | std_init_destination(j_compress_ptr cinfo) |
| 320 | { |
| 321 | JPEGState* sp = (JPEGState*) cinfo; |
| 322 | TIFF* tif = sp->tif; |
| 323 | |
| 324 | sp->dest.next_output_byte = (JOCTET*) tif->tif_rawdata; |
| 325 | sp->dest.free_in_buffer = (size_t) tif->tif_rawdatasize; |
| 326 | } |
| 327 | |
| 328 | static boolean |
| 329 | std_empty_output_buffer(j_compress_ptr cinfo) |
| 330 | { |
| 331 | JPEGState* sp = (JPEGState*) cinfo; |
| 332 | TIFF* tif = sp->tif; |
| 333 | |
| 334 | /* the entire buffer has been filled */ |
| 335 | tif->tif_rawcc = tif->tif_rawdatasize; |
| 336 | TIFFFlushData1(tif); |
| 337 | sp->dest.next_output_byte = (JOCTET*) tif->tif_rawdata; |
| 338 | sp->dest.free_in_buffer = (size_t) tif->tif_rawdatasize; |
| 339 | |
| 340 | return (TRUE); |
| 341 | } |
| 342 | |
| 343 | static void |
| 344 | std_term_destination(j_compress_ptr cinfo) |
| 345 | { |
| 346 | JPEGState* sp = (JPEGState*) cinfo; |
| 347 | TIFF* tif = sp->tif; |
| 348 | |
| 349 | tif->tif_rawcp = (tidata_t) sp->dest.next_output_byte; |
| 350 | tif->tif_rawcc = |
| 351 | tif->tif_rawdatasize - (tsize_t) sp->dest.free_in_buffer; |
| 352 | /* NB: libtiff does the final buffer flush */ |
| 353 | } |
| 354 | |
| 355 | static void |
| 356 | TIFFjpeg_data_dest(JPEGState* sp, TIFF* tif) |
| 357 | { |
| 358 | (void) tif; |
| 359 | sp->cinfo.c.dest = &sp->dest; |
| 360 | sp->dest.init_destination = std_init_destination; |
| 361 | sp->dest.empty_output_buffer = std_empty_output_buffer; |
| 362 | sp->dest.term_destination = std_term_destination; |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Alternate destination manager for outputting to JPEGTables field. |
| 367 | */ |
| 368 | |
| 369 | static void |
| 370 | tables_init_destination(j_compress_ptr cinfo) |
| 371 | { |
| 372 | JPEGState* sp = (JPEGState*) cinfo; |
| 373 | |
| 374 | /* while building, jpegtables_length is allocated buffer size */ |
| 375 | sp->dest.next_output_byte = (JOCTET*) sp->jpegtables; |
| 376 | sp->dest.free_in_buffer = (size_t) sp->jpegtables_length; |
| 377 | } |
| 378 | |
| 379 | static boolean |
| 380 | tables_empty_output_buffer(j_compress_ptr cinfo) |
| 381 | { |
| 382 | JPEGState* sp = (JPEGState*) cinfo; |
| 383 | void* newbuf; |
| 384 | |
| 385 | /* the entire buffer has been filled; enlarge it by 1000 bytes */ |
| 386 | newbuf = _TIFFrealloc((tdata_t) sp->jpegtables, |
| 387 | (tsize_t) (sp->jpegtables_length + 1000)); |
| 388 | if (newbuf == NULL) |
| 389 | ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 100); |
| 390 | sp->dest.next_output_byte = (JOCTET*) newbuf + sp->jpegtables_length; |
| 391 | sp->dest.free_in_buffer = (size_t) 1000; |
| 392 | sp->jpegtables = newbuf; |
| 393 | sp->jpegtables_length += 1000; |
| 394 | return (TRUE); |
| 395 | } |
| 396 | |
| 397 | static void |
| 398 | tables_term_destination(j_compress_ptr cinfo) |
| 399 | { |
| 400 | JPEGState* sp = (JPEGState*) cinfo; |
| 401 | |
| 402 | /* set tables length to number of bytes actually emitted */ |
| 403 | sp->jpegtables_length -= sp->dest.free_in_buffer; |
| 404 | } |
| 405 | |
| 406 | static int |
| 407 | TIFFjpeg_tables_dest(JPEGState* sp, TIFF* tif) |
| 408 | { |
| 409 | (void) tif; |
| 410 | /* |
| 411 | * Allocate a working buffer for building tables. |
| 412 | * Initial size is 1000 bytes, which is usually adequate. |
| 413 | */ |
| 414 | if (sp->jpegtables) |
| 415 | _TIFFfree(sp->jpegtables); |
| 416 | sp->jpegtables_length = 1000; |
| 417 | sp->jpegtables = (void*) _TIFFmalloc((tsize_t) sp->jpegtables_length); |
| 418 | if (sp->jpegtables == NULL) { |
| 419 | sp->jpegtables_length = 0; |
| 420 | TIFFError("TIFFjpeg_tables_dest", "No space for JPEGTables"); |
| 421 | return (0); |
| 422 | } |
| 423 | sp->cinfo.c.dest = &sp->dest; |
| 424 | sp->dest.init_destination = tables_init_destination; |
| 425 | sp->dest.empty_output_buffer = tables_empty_output_buffer; |
| 426 | sp->dest.term_destination = tables_term_destination; |
| 427 | return (1); |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * JPEG library source data manager. |
| 432 | * These routines supply compressed data to libjpeg. |
| 433 | */ |
| 434 | |
| 435 | static void |
| 436 | std_init_source(j_decompress_ptr cinfo) |
| 437 | { |
| 438 | JPEGState* sp = (JPEGState*) cinfo; |
| 439 | TIFF* tif = sp->tif; |
| 440 | |
| 441 | sp->src.next_input_byte = (const JOCTET*) tif->tif_rawdata; |
| 442 | sp->src.bytes_in_buffer = (size_t) tif->tif_rawcc; |
| 443 | } |
| 444 | |
| 445 | static boolean |
| 446 | std_fill_input_buffer(j_decompress_ptr cinfo) |
| 447 | { |
| 448 | JPEGState* sp = (JPEGState* ) cinfo; |
| 449 | static const JOCTET dummy_EOI[2] = { 0xFF, JPEG_EOI }; |
| 450 | |
| 451 | /* |
| 452 | * Should never get here since entire strip/tile is |
| 453 | * read into memory before the decompressor is called, |
| 454 | * and thus was supplied by init_source. |
| 455 | */ |
| 456 | WARNMS(cinfo, JWRN_JPEG_EOF); |
| 457 | /* insert a fake EOI marker */ |
| 458 | sp->src.next_input_byte = dummy_EOI; |
| 459 | sp->src.bytes_in_buffer = 2; |
| 460 | return (TRUE); |
| 461 | } |
| 462 | |
| 463 | static void |
| 464 | std_skip_input_data(j_decompress_ptr cinfo, long num_bytes) |
| 465 | { |
| 466 | JPEGState* sp = (JPEGState*) cinfo; |
| 467 | |
| 468 | if (num_bytes > 0) { |
| 469 | if (num_bytes > (long) sp->src.bytes_in_buffer) { |
| 470 | /* oops, buffer overrun */ |
| 471 | (void) std_fill_input_buffer(cinfo); |
| 472 | } else { |
| 473 | sp->src.next_input_byte += (size_t) num_bytes; |
| 474 | sp->src.bytes_in_buffer -= (size_t) num_bytes; |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | static void |
| 480 | std_term_source(j_decompress_ptr cinfo) |
| 481 | { |
| 482 | /* No work necessary here */ |
| 483 | /* Or must we update tif->tif_rawcp, tif->tif_rawcc ??? */ |
| 484 | /* (if so, need empty tables_term_source!) */ |
| 485 | (void) cinfo; |
| 486 | } |
| 487 | |
| 488 | static void |
| 489 | TIFFjpeg_data_src(JPEGState* sp, TIFF* tif) |
| 490 | { |
| 491 | (void) tif; |
| 492 | sp->cinfo.d.src = &sp->src; |
| 493 | sp->src.init_source = std_init_source; |
| 494 | sp->src.fill_input_buffer = std_fill_input_buffer; |
| 495 | sp->src.skip_input_data = std_skip_input_data; |
| 496 | sp->src.resync_to_restart = jpeg_resync_to_restart; |
| 497 | sp->src.term_source = std_term_source; |
| 498 | sp->src.bytes_in_buffer = 0; /* for safety */ |
| 499 | sp->src.next_input_byte = NULL; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Alternate source manager for reading from JPEGTables. |
| 504 | * We can share all the code except for the init routine. |
| 505 | */ |
| 506 | |
| 507 | static void |
| 508 | tables_init_source(j_decompress_ptr cinfo) |
| 509 | { |
| 510 | JPEGState* sp = (JPEGState*) cinfo; |
| 511 | |
| 512 | sp->src.next_input_byte = (const JOCTET*) sp->jpegtables; |
| 513 | sp->src.bytes_in_buffer = (size_t) sp->jpegtables_length; |
| 514 | } |
| 515 | |
| 516 | static void |
| 517 | TIFFjpeg_tables_src(JPEGState* sp, TIFF* tif) |
| 518 | { |
| 519 | TIFFjpeg_data_src(sp, tif); |
| 520 | sp->src.init_source = tables_init_source; |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Allocate downsampled-data buffers needed for downsampled I/O. |
| 525 | * We use values computed in jpeg_start_compress or jpeg_start_decompress. |
| 526 | * We use libjpeg's allocator so that buffers will be released automatically |
| 527 | * when done with strip/tile. |
| 528 | * This is also a handy place to compute samplesperclump, bytesperline. |
| 529 | */ |
| 530 | static int |
| 531 | alloc_downsampled_buffers(TIFF* tif, jpeg_component_info* comp_info, |
| 532 | int num_components) |
| 533 | { |
| 534 | JPEGState* sp = JState(tif); |
| 535 | int ci; |
| 536 | jpeg_component_info* compptr; |
| 537 | JSAMPARRAY buf; |
| 538 | int samples_per_clump = 0; |
| 539 | |
| 540 | for (ci = 0, compptr = comp_info; ci < num_components; |
| 541 | ci++, compptr++) { |
| 542 | samples_per_clump += compptr->h_samp_factor * |
| 543 | compptr->v_samp_factor; |
| 544 | buf = TIFFjpeg_alloc_sarray(sp, JPOOL_IMAGE, |
| 545 | compptr->width_in_blocks * DCTSIZE, |
| 546 | (JDIMENSION) (compptr->v_samp_factor*DCTSIZE)); |
| 547 | if (buf == NULL) |
| 548 | return (0); |
| 549 | sp->ds_buffer[ci] = buf; |
| 550 | } |
| 551 | sp->samplesperclump = samples_per_clump; |
| 552 | /* Cb,Cr both have sampling factors 1 */ |
| 553 | /* so downsampled width of Cb is # of clumps per line */ |
| 554 | sp->bytesperline = sizeof(JSAMPLE) * samples_per_clump * |
| 555 | comp_info[1].downsampled_width; |
| 556 | return (1); |
| 557 | } |
| 558 | |
| 559 | |
| 560 | /* |
| 561 | * JPEG Decoding. |
| 562 | */ |
| 563 | |
| 564 | static int |
| 565 | JPEGSetupDecode(TIFF* tif) |
| 566 | { |
| 567 | JPEGState* sp = JState(tif); |
| 568 | TIFFDirectory *td = &tif->tif_dir; |
| 569 | |
| 570 | assert(sp != NULL); |
| 571 | assert(sp->cinfo.comm.is_decompressor); |
| 572 | |
| 573 | /* Read JPEGTables if it is present */ |
| 574 | if (TIFFFieldSet(tif,FIELD_JPEGTABLES)) { |
| 575 | TIFFjpeg_tables_src(sp, tif); |
| 576 | if(TIFFjpeg_read_header(sp,FALSE) != JPEG_HEADER_TABLES_ONLY) { |
| 577 | TIFFError("JPEGSetupDecode", "Bogus JPEGTables field"); |
| 578 | return (0); |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* Grab parameters that are same for all strips/tiles */ |
| 583 | sp->photometric = td->td_photometric; |
| 584 | switch (sp->photometric) { |
| 585 | case PHOTOMETRIC_YCBCR: |
| 586 | sp->h_sampling = td->td_ycbcrsubsampling[0]; |
| 587 | sp->v_sampling = td->td_ycbcrsubsampling[1]; |
| 588 | break; |
| 589 | default: |
| 590 | /* TIFF 6.0 forbids subsampling of all other color spaces */ |
| 591 | sp->h_sampling = 1; |
| 592 | sp->v_sampling = 1; |
| 593 | break; |
| 594 | } |
| 595 | |
| 596 | /* Set up for reading normal data */ |
| 597 | TIFFjpeg_data_src(sp, tif); |
| 598 | tif->tif_postdecode = _TIFFNoPostDecode; /* override byte swapping */ |
| 599 | return (1); |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Set up for decoding a strip or tile. |
| 604 | */ |
| 605 | static int |
| 606 | JPEGPreDecode(TIFF* tif, tsample_t s) |
| 607 | { |
| 608 | JPEGState *sp = JState(tif); |
| 609 | TIFFDirectory *td = &tif->tif_dir; |
| 610 | static const char module[] = "JPEGPreDecode"; |
| 611 | uint32 segment_width, segment_height; |
| 612 | int downsampled_output; |
| 613 | int ci; |
| 614 | |
| 615 | assert(sp != NULL); |
| 616 | assert(sp->cinfo.comm.is_decompressor); |
| 617 | /* |
| 618 | * Reset decoder state from any previous strip/tile, |
| 619 | * in case application didn't read the whole strip. |
| 620 | */ |
| 621 | if (!TIFFjpeg_abort(sp)) |
| 622 | return (0); |
| 623 | /* |
| 624 | * Read the header for this strip/tile. |
| 625 | */ |
| 626 | if (TIFFjpeg_read_header(sp, TRUE) != JPEG_HEADER_OK) |
| 627 | return (0); |
| 628 | /* |
| 629 | * Check image parameters and set decompression parameters. |
| 630 | */ |
| 631 | if (isTiled(tif)) { |
| 632 | segment_width = td->td_tilewidth; |
| 633 | segment_height = td->td_tilelength; |
| 634 | sp->bytesperline = TIFFTileRowSize(tif); |
| 635 | } else { |
| 636 | segment_width = td->td_imagewidth; |
| 637 | segment_height = td->td_imagelength - tif->tif_row; |
| 638 | if (segment_height > td->td_rowsperstrip) |
| 639 | segment_height = td->td_rowsperstrip; |
| 640 | sp->bytesperline = TIFFScanlineSize(tif); |
| 641 | } |
| 642 | if (td->td_planarconfig == PLANARCONFIG_SEPARATE && s > 0) { |
| 643 | /* |
| 644 | * For PC 2, scale down the expected strip/tile size |
| 645 | * to match a downsampled component |
| 646 | */ |
| 647 | segment_width = TIFFhowmany(segment_width, sp->h_sampling); |
| 648 | segment_height = TIFFhowmany(segment_height, sp->v_sampling); |
| 649 | } |
| 650 | if (sp->cinfo.d.image_width != segment_width || |
| 651 | sp->cinfo.d.image_height != segment_height) { |
| 652 | TIFFError(module, "Improper JPEG strip/tile size"); |
| 653 | return (0); |
| 654 | } |
| 655 | if (sp->cinfo.d.num_components != |
| 656 | (td->td_planarconfig == PLANARCONFIG_CONTIG ? |
| 657 | td->td_samplesperpixel : 1)) { |
| 658 | TIFFError(module, "Improper JPEG component count"); |
| 659 | return (0); |
| 660 | } |
| 661 | if (sp->cinfo.d.data_precision != td->td_bitspersample) { |
| 662 | TIFFError(module, "Improper JPEG data precision"); |
| 663 | return (0); |
| 664 | } |
| 665 | if (td->td_planarconfig == PLANARCONFIG_CONTIG) { |
| 666 | /* Component 0 should have expected sampling factors */ |
| 667 | if (sp->cinfo.d.comp_info[0].h_samp_factor != sp->h_sampling || |
| 668 | sp->cinfo.d.comp_info[0].v_samp_factor != sp->v_sampling) { |
| 669 | TIFFError(module, "Improper JPEG sampling factors"); |
| 670 | return (0); |
| 671 | } |
| 672 | /* Rest should have sampling factors 1,1 */ |
| 673 | for (ci = 1; ci < sp->cinfo.d.num_components; ci++) { |
| 674 | if (sp->cinfo.d.comp_info[ci].h_samp_factor != 1 || |
| 675 | sp->cinfo.d.comp_info[ci].v_samp_factor != 1) { |
| 676 | TIFFError(module, "Improper JPEG sampling factors"); |
| 677 | return (0); |
| 678 | } |
| 679 | } |
| 680 | } else { |
| 681 | /* PC 2's single component should have sampling factors 1,1 */ |
| 682 | if (sp->cinfo.d.comp_info[0].h_samp_factor != 1 || |
| 683 | sp->cinfo.d.comp_info[0].v_samp_factor != 1) { |
| 684 | TIFFError(module, "Improper JPEG sampling factors"); |
| 685 | return (0); |
| 686 | } |
| 687 | } |
| 688 | downsampled_output = FALSE; |
| 689 | if (td->td_planarconfig == PLANARCONFIG_CONTIG && |
| 690 | sp->photometric == PHOTOMETRIC_YCBCR && |
| 691 | sp->jpegcolormode == JPEGCOLORMODE_RGB) { |
| 692 | /* Convert YCbCr to RGB */ |
| 693 | sp->cinfo.d.jpeg_color_space = JCS_YCbCr; |
| 694 | sp->cinfo.d.out_color_space = JCS_RGB; |
| 695 | } else { |
| 696 | /* Suppress colorspace handling */ |
| 697 | sp->cinfo.d.jpeg_color_space = JCS_UNKNOWN; |
| 698 | sp->cinfo.d.out_color_space = JCS_UNKNOWN; |
| 699 | if (td->td_planarconfig == PLANARCONFIG_CONTIG && |
| 700 | (sp->h_sampling != 1 || sp->v_sampling != 1)) |
| 701 | downsampled_output = TRUE; |
| 702 | /* XXX what about up-sampling? */ |
| 703 | } |
| 704 | if (downsampled_output) { |
| 705 | /* Need to use raw-data interface to libjpeg */ |
| 706 | sp->cinfo.d.raw_data_out = TRUE; |
| 707 | tif->tif_decoderow = JPEGDecodeRaw; |
| 708 | tif->tif_decodestrip = JPEGDecodeRaw; |
| 709 | tif->tif_decodetile = JPEGDecodeRaw; |
| 710 | } else { |
| 711 | /* Use normal interface to libjpeg */ |
| 712 | sp->cinfo.d.raw_data_out = FALSE; |
| 713 | tif->tif_decoderow = JPEGDecode; |
| 714 | tif->tif_decodestrip = JPEGDecode; |
| 715 | tif->tif_decodetile = JPEGDecode; |
| 716 | } |
| 717 | /* Start JPEG decompressor */ |
| 718 | if (!TIFFjpeg_start_decompress(sp)) |
| 719 | return (0); |
| 720 | /* Allocate downsampled-data buffers if needed */ |
| 721 | if (downsampled_output) { |
| 722 | if (!alloc_downsampled_buffers(tif, sp->cinfo.d.comp_info, |
| 723 | sp->cinfo.d.num_components)) |
| 724 | return (0); |
| 725 | sp->scancount = DCTSIZE; /* mark buffer empty */ |
| 726 | } |
| 727 | return (1); |
| 728 | } |
| 729 | |
| 730 | /* |
| 731 | * Decode a chunk of pixels. |
| 732 | * "Standard" case: returned data is not downsampled. |
| 733 | */ |
| 734 | static int |
| 735 | JPEGDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s) |
| 736 | { |
| 737 | JPEGState *sp = JState(tif); |
| 738 | tsize_t nrows; |
| 739 | JSAMPROW bufptr[1]; |
| 740 | |
| 741 | (void) s; |
| 742 | assert(sp != NULL); |
| 743 | /* data is expected to be read in multiples of a scanline */ |
| 744 | nrows = cc / sp->bytesperline; |
| 745 | if (cc % sp->bytesperline) |
| 746 | TIFFWarning(tif->tif_name, "fractional scanline not read"); |
| 747 | |
| 748 | while (nrows-- > 0) { |
| 749 | bufptr[0] = (JSAMPROW) buf; |
| 750 | if (TIFFjpeg_read_scanlines(sp, bufptr, 1) != 1) |
| 751 | return (0); |
| 752 | if (nrows > 0) |
| 753 | tif->tif_row++; |
| 754 | buf += sp->bytesperline; |
| 755 | } |
| 756 | /* Close down the decompressor if we've finished the strip or tile. */ |
| 757 | if (sp->cinfo.d.output_scanline == sp->cinfo.d.output_height) { |
| 758 | if (TIFFjpeg_finish_decompress(sp) != TRUE) |
| 759 | return (0); |
| 760 | } |
| 761 | return (1); |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * Decode a chunk of pixels. |
| 766 | * Returned data is downsampled per sampling factors. |
| 767 | */ |
| 768 | static int |
| 769 | JPEGDecodeRaw(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s) |
| 770 | { |
| 771 | JPEGState *sp = JState(tif); |
| 772 | JSAMPLE* inptr; |
| 773 | JSAMPLE* outptr; |
| 774 | tsize_t nrows; |
| 775 | JDIMENSION clumps_per_line, nclump; |
| 776 | int clumpoffset, ci, xpos, ypos; |
| 777 | jpeg_component_info* compptr; |
| 778 | int samples_per_clump = sp->samplesperclump; |
| 779 | |
| 780 | (void) s; |
| 781 | assert(sp != NULL); |
| 782 | /* data is expected to be read in multiples of a scanline */ |
| 783 | nrows = cc / sp->bytesperline; |
| 784 | if (cc % sp->bytesperline) |
| 785 | TIFFWarning(tif->tif_name, "fractional scanline not read"); |
| 786 | |
| 787 | /* Cb,Cr both have sampling factors 1, so this is correct */ |
| 788 | clumps_per_line = sp->cinfo.d.comp_info[1].downsampled_width; |
| 789 | |
| 790 | while (nrows-- > 0) { |
| 791 | /* Reload downsampled-data buffer if needed */ |
| 792 | if (sp->scancount >= DCTSIZE) { |
| 793 | int n = sp->cinfo.d.max_v_samp_factor * DCTSIZE; |
| 794 | if (TIFFjpeg_read_raw_data(sp, sp->ds_buffer, n) != n) |
| 795 | return (0); |
| 796 | sp->scancount = 0; |
| 797 | /* Close down the decompressor if done. */ |
| 798 | if (sp->cinfo.d.output_scanline >= |
| 799 | sp->cinfo.d.output_height) { |
| 800 | if (TIFFjpeg_finish_decompress(sp) != TRUE) |
| 801 | return (0); |
| 802 | } |
| 803 | } |
| 804 | /* |
| 805 | * Fastest way to unseparate the data is to make one pass |
| 806 | * over the scanline for each row of each component. |
| 807 | */ |
| 808 | clumpoffset = 0; /* first sample in clump */ |
| 809 | for (ci = 0, compptr = sp->cinfo.d.comp_info; |
| 810 | ci < sp->cinfo.d.num_components; |
| 811 | ci++, compptr++) { |
| 812 | int hsamp = compptr->h_samp_factor; |
| 813 | int vsamp = compptr->v_samp_factor; |
| 814 | for (ypos = 0; ypos < vsamp; ypos++) { |
| 815 | inptr = sp->ds_buffer[ci][sp->scancount*vsamp + ypos]; |
| 816 | outptr = ((JSAMPLE*) buf) + clumpoffset; |
| 817 | if (hsamp == 1) { |
| 818 | /* fast path for at least Cb and Cr */ |
| 819 | for (nclump = clumps_per_line; nclump-- > 0; ) { |
| 820 | outptr[0] = *inptr++; |
| 821 | outptr += samples_per_clump; |
| 822 | } |
| 823 | } else { |
| 824 | /* general case */ |
| 825 | for (nclump = clumps_per_line; nclump-- > 0; ) { |
| 826 | for (xpos = 0; xpos < hsamp; xpos++) |
| 827 | outptr[xpos] = *inptr++; |
| 828 | outptr += samples_per_clump; |
| 829 | } |
| 830 | } |
| 831 | clumpoffset += hsamp; |
| 832 | } |
| 833 | } |
| 834 | sp->scancount++; |
| 835 | if (nrows > 0) |
| 836 | tif->tif_row++; |
| 837 | buf += sp->bytesperline; |
| 838 | } |
| 839 | return (1); |
| 840 | } |
| 841 | |
| 842 | |
| 843 | /* |
| 844 | * JPEG Encoding. |
| 845 | */ |
| 846 | |
| 847 | static void |
| 848 | unsuppress_quant_table (JPEGState* sp, int tblno) |
| 849 | { |
| 850 | JQUANT_TBL* qtbl; |
| 851 | |
| 852 | if ((qtbl = sp->cinfo.c.quant_tbl_ptrs[tblno]) != NULL) |
| 853 | qtbl->sent_table = FALSE; |
| 854 | } |
| 855 | |
| 856 | static void |
| 857 | unsuppress_huff_table (JPEGState* sp, int tblno) |
| 858 | { |
| 859 | JHUFF_TBL* htbl; |
| 860 | |
| 861 | if ((htbl = sp->cinfo.c.dc_huff_tbl_ptrs[tblno]) != NULL) |
| 862 | htbl->sent_table = FALSE; |
| 863 | if ((htbl = sp->cinfo.c.ac_huff_tbl_ptrs[tblno]) != NULL) |
| 864 | htbl->sent_table = FALSE; |
| 865 | } |
| 866 | |
| 867 | static int |
| 868 | prepare_JPEGTables(TIFF* tif) |
| 869 | { |
| 870 | JPEGState* sp = JState(tif); |
| 871 | |
| 872 | /* Initialize quant tables for current quality setting */ |
| 873 | if (!TIFFjpeg_set_quality(sp, sp->jpegquality, FALSE)) |
| 874 | return (0); |
| 875 | /* Mark only the tables we want for output */ |
| 876 | /* NB: chrominance tables are currently used only with YCbCr */ |
| 877 | if (!TIFFjpeg_suppress_tables(sp, TRUE)) |
| 878 | return (0); |
| 879 | if (sp->jpegtablesmode & JPEGTABLESMODE_QUANT) { |
| 880 | unsuppress_quant_table(sp, 0); |
| 881 | if (sp->photometric == PHOTOMETRIC_YCBCR) |
| 882 | unsuppress_quant_table(sp, 1); |
| 883 | } |
| 884 | if (sp->jpegtablesmode & JPEGTABLESMODE_HUFF) { |
| 885 | unsuppress_huff_table(sp, 0); |
| 886 | if (sp->photometric == PHOTOMETRIC_YCBCR) |
| 887 | unsuppress_huff_table(sp, 1); |
| 888 | } |
| 889 | /* Direct libjpeg output into jpegtables */ |
| 890 | if (!TIFFjpeg_tables_dest(sp, tif)) |
| 891 | return (0); |
| 892 | /* Emit tables-only datastream */ |
| 893 | if (!TIFFjpeg_write_tables(sp)) |
| 894 | return (0); |
| 895 | |
| 896 | return (1); |
| 897 | } |
| 898 | |
| 899 | static int |
| 900 | JPEGSetupEncode(TIFF* tif) |
| 901 | { |
| 902 | JPEGState* sp = JState(tif); |
| 903 | TIFFDirectory *td = &tif->tif_dir; |
| 904 | static const char module[] = "JPEGSetupEncode"; |
| 905 | |
| 906 | assert(sp != NULL); |
| 907 | assert(!sp->cinfo.comm.is_decompressor); |
| 908 | |
| 909 | /* |
| 910 | * Initialize all JPEG parameters to default values. |
| 911 | * Note that jpeg_set_defaults needs legal values for |
| 912 | * in_color_space and input_components. |
| 913 | */ |
| 914 | sp->cinfo.c.in_color_space = JCS_UNKNOWN; |
| 915 | sp->cinfo.c.input_components = 1; |
| 916 | if (!TIFFjpeg_set_defaults(sp)) |
| 917 | return (0); |
| 918 | /* Set per-file parameters */ |
| 919 | sp->photometric = td->td_photometric; |
| 920 | switch (sp->photometric) { |
| 921 | case PHOTOMETRIC_YCBCR: |
| 922 | sp->h_sampling = td->td_ycbcrsubsampling[0]; |
| 923 | sp->v_sampling = td->td_ycbcrsubsampling[1]; |
| 924 | /* |
| 925 | * A ReferenceBlackWhite field *must* be present since the |
| 926 | * default value is inappropriate for YCbCr. Fill in the |
| 927 | * proper value if application didn't set it. |
| 928 | */ |
| 929 | #ifdef COLORIMETRY_SUPPORT |
| 930 | if (!TIFFFieldSet(tif, FIELD_REFBLACKWHITE)) { |
| 931 | float refbw[6]; |
| 932 | long top = 1L << td->td_bitspersample; |
| 933 | refbw[0] = 0; |
| 934 | refbw[1] = (float)(top-1L); |
| 935 | refbw[2] = (float)(top>>1); |
| 936 | refbw[3] = refbw[1]; |
| 937 | refbw[4] = refbw[2]; |
| 938 | refbw[5] = refbw[1]; |
| 939 | TIFFSetField(tif, TIFFTAG_REFERENCEBLACKWHITE, refbw); |
| 940 | } |
| 941 | #endif |
| 942 | break; |
| 943 | case PHOTOMETRIC_PALETTE: /* disallowed by Tech Note */ |
| 944 | case PHOTOMETRIC_MASK: |
| 945 | TIFFError(module, |
| 946 | "PhotometricInterpretation %d not allowed for JPEG", |
| 947 | (int) sp->photometric); |
| 948 | return (0); |
| 949 | default: |
| 950 | /* TIFF 6.0 forbids subsampling of all other color spaces */ |
| 951 | sp->h_sampling = 1; |
| 952 | sp->v_sampling = 1; |
| 953 | break; |
| 954 | } |
| 955 | |
| 956 | /* Verify miscellaneous parameters */ |
| 957 | |
| 958 | /* |
| 959 | * This would need work if libtiff ever supports different |
| 960 | * depths for different components, or if libjpeg ever supports |
| 961 | * run-time selection of depth. Neither is imminent. |
| 962 | */ |
| 963 | if (td->td_bitspersample != BITS_IN_JSAMPLE) { |
| 964 | TIFFError(module, "BitsPerSample %d not allowed for JPEG", |
| 965 | (int) td->td_bitspersample); |
| 966 | return (0); |
| 967 | } |
| 968 | sp->cinfo.c.data_precision = td->td_bitspersample; |
| 969 | if (isTiled(tif)) { |
| 970 | if ((td->td_tilelength % (sp->v_sampling * DCTSIZE)) != 0) { |
| 971 | TIFFError(module, |
| 972 | "JPEG tile height must be multiple of %d", |
| 973 | sp->v_sampling * DCTSIZE); |
| 974 | return (0); |
| 975 | } |
| 976 | if ((td->td_tilewidth % (sp->h_sampling * DCTSIZE)) != 0) { |
| 977 | TIFFError(module, |
| 978 | "JPEG tile width must be multiple of %d", |
| 979 | sp->h_sampling * DCTSIZE); |
| 980 | return (0); |
| 981 | } |
| 982 | } else { |
| 983 | if (td->td_rowsperstrip < td->td_imagelength && |
| 984 | (td->td_rowsperstrip % (sp->v_sampling * DCTSIZE)) != 0) { |
| 985 | TIFFError(module, |
| 986 | "RowsPerStrip must be multiple of %d for JPEG", |
| 987 | sp->v_sampling * DCTSIZE); |
| 988 | return (0); |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | /* Create a JPEGTables field if appropriate */ |
| 993 | if (sp->jpegtablesmode & (JPEGTABLESMODE_QUANT|JPEGTABLESMODE_HUFF)) { |
| 994 | if (!prepare_JPEGTables(tif)) |
| 995 | return (0); |
| 996 | /* Mark the field present */ |
| 997 | /* Can't use TIFFSetField since BEENWRITING is already set! */ |
| 998 | TIFFSetFieldBit(tif, FIELD_JPEGTABLES); |
| 999 | tif->tif_flags |= TIFF_DIRTYDIRECT; |
| 1000 | } else { |
| 1001 | /* We do not support application-supplied JPEGTables, */ |
| 1002 | /* so mark the field not present */ |
| 1003 | TIFFClrFieldBit(tif, FIELD_JPEGTABLES); |
| 1004 | } |
| 1005 | |
| 1006 | /* Direct libjpeg output to libtiff's output buffer */ |
| 1007 | TIFFjpeg_data_dest(sp, tif); |
| 1008 | |
| 1009 | return (1); |
| 1010 | } |
| 1011 | |
| 1012 | /* |
| 1013 | * Set encoding state at the start of a strip or tile. |
| 1014 | */ |
| 1015 | static int |
| 1016 | JPEGPreEncode(TIFF* tif, tsample_t s) |
| 1017 | { |
| 1018 | JPEGState *sp = JState(tif); |
| 1019 | TIFFDirectory *td = &tif->tif_dir; |
| 1020 | static const char module[] = "JPEGPreEncode"; |
| 1021 | uint32 segment_width, segment_height; |
| 1022 | int downsampled_input; |
| 1023 | |
| 1024 | assert(sp != NULL); |
| 1025 | assert(!sp->cinfo.comm.is_decompressor); |
| 1026 | /* |
| 1027 | * Set encoding parameters for this strip/tile. |
| 1028 | */ |
| 1029 | if (isTiled(tif)) { |
| 1030 | segment_width = td->td_tilewidth; |
| 1031 | segment_height = td->td_tilelength; |
| 1032 | sp->bytesperline = TIFFTileRowSize(tif); |
| 1033 | } else { |
| 1034 | segment_width = td->td_imagewidth; |
| 1035 | segment_height = td->td_imagelength - tif->tif_row; |
| 1036 | if (segment_height > td->td_rowsperstrip) |
| 1037 | segment_height = td->td_rowsperstrip; |
| 1038 | sp->bytesperline = TIFFScanlineSize(tif); |
| 1039 | } |
| 1040 | if (td->td_planarconfig == PLANARCONFIG_SEPARATE && s > 0) { |
| 1041 | /* for PC 2, scale down the strip/tile size |
| 1042 | * to match a downsampled component |
| 1043 | */ |
| 1044 | segment_width = TIFFhowmany(segment_width, sp->h_sampling); |
| 1045 | segment_height = TIFFhowmany(segment_height, sp->v_sampling); |
| 1046 | } |
| 1047 | if (segment_width > 65535 || segment_height > 65535) { |
| 1048 | TIFFError(module, "Strip/tile too large for JPEG"); |
| 1049 | return (0); |
| 1050 | } |
| 1051 | sp->cinfo.c.image_width = segment_width; |
| 1052 | sp->cinfo.c.image_height = segment_height; |
| 1053 | downsampled_input = FALSE; |
| 1054 | if (td->td_planarconfig == PLANARCONFIG_CONTIG) { |
| 1055 | sp->cinfo.c.input_components = td->td_samplesperpixel; |
| 1056 | if (sp->photometric == PHOTOMETRIC_YCBCR) { |
| 1057 | if (sp->jpegcolormode == JPEGCOLORMODE_RGB) { |
| 1058 | sp->cinfo.c.in_color_space = JCS_RGB; |
| 1059 | } else { |
| 1060 | sp->cinfo.c.in_color_space = JCS_YCbCr; |
| 1061 | if (sp->h_sampling != 1 || sp->v_sampling != 1) |
| 1062 | downsampled_input = TRUE; |
| 1063 | } |
| 1064 | if (!TIFFjpeg_set_colorspace(sp, JCS_YCbCr)) |
| 1065 | return (0); |
| 1066 | /* |
| 1067 | * Set Y sampling factors; |
| 1068 | * we assume jpeg_set_colorspace() set the rest to 1 |
| 1069 | */ |
| 1070 | sp->cinfo.c.comp_info[0].h_samp_factor = sp->h_sampling; |
| 1071 | sp->cinfo.c.comp_info[0].v_samp_factor = sp->v_sampling; |
| 1072 | } else { |
| 1073 | sp->cinfo.c.in_color_space = JCS_UNKNOWN; |
| 1074 | if (!TIFFjpeg_set_colorspace(sp, JCS_UNKNOWN)) |
| 1075 | return (0); |
| 1076 | /* jpeg_set_colorspace set all sampling factors to 1 */ |
| 1077 | } |
| 1078 | } else { |
| 1079 | sp->cinfo.c.input_components = 1; |
| 1080 | sp->cinfo.c.in_color_space = JCS_UNKNOWN; |
| 1081 | if (!TIFFjpeg_set_colorspace(sp, JCS_UNKNOWN)) |
| 1082 | return (0); |
| 1083 | sp->cinfo.c.comp_info[0].component_id = s; |
| 1084 | /* jpeg_set_colorspace() set sampling factors to 1 */ |
| 1085 | if (sp->photometric == PHOTOMETRIC_YCBCR && s > 0) { |
| 1086 | sp->cinfo.c.comp_info[0].quant_tbl_no = 1; |
| 1087 | sp->cinfo.c.comp_info[0].dc_tbl_no = 1; |
| 1088 | sp->cinfo.c.comp_info[0].ac_tbl_no = 1; |
| 1089 | } |
| 1090 | } |
| 1091 | /* ensure libjpeg won't write any extraneous markers */ |
| 1092 | sp->cinfo.c.write_JFIF_header = FALSE; |
| 1093 | sp->cinfo.c.write_Adobe_marker = FALSE; |
| 1094 | /* set up table handling correctly */ |
| 1095 | if (! (sp->jpegtablesmode & JPEGTABLESMODE_QUANT)) { |
| 1096 | if (!TIFFjpeg_set_quality(sp, sp->jpegquality, FALSE)) |
| 1097 | return (0); |
| 1098 | unsuppress_quant_table(sp, 0); |
| 1099 | unsuppress_quant_table(sp, 1); |
| 1100 | } |
| 1101 | if (sp->jpegtablesmode & JPEGTABLESMODE_HUFF) |
| 1102 | sp->cinfo.c.optimize_coding = FALSE; |
| 1103 | else |
| 1104 | sp->cinfo.c.optimize_coding = TRUE; |
| 1105 | if (downsampled_input) { |
| 1106 | /* Need to use raw-data interface to libjpeg */ |
| 1107 | sp->cinfo.c.raw_data_in = TRUE; |
| 1108 | tif->tif_encoderow = JPEGEncodeRaw; |
| 1109 | tif->tif_encodestrip = JPEGEncodeRaw; |
| 1110 | tif->tif_encodetile = JPEGEncodeRaw; |
| 1111 | } else { |
| 1112 | /* Use normal interface to libjpeg */ |
| 1113 | sp->cinfo.c.raw_data_in = FALSE; |
| 1114 | tif->tif_encoderow = JPEGEncode; |
| 1115 | tif->tif_encodestrip = JPEGEncode; |
| 1116 | tif->tif_encodetile = JPEGEncode; |
| 1117 | } |
| 1118 | /* Start JPEG compressor */ |
| 1119 | if (!TIFFjpeg_start_compress(sp, FALSE)) |
| 1120 | return (0); |
| 1121 | /* Allocate downsampled-data buffers if needed */ |
| 1122 | if (downsampled_input) { |
| 1123 | if (!alloc_downsampled_buffers(tif, sp->cinfo.c.comp_info, |
| 1124 | sp->cinfo.c.num_components)) |
| 1125 | return (0); |
| 1126 | } |
| 1127 | sp->scancount = 0; |
| 1128 | |
| 1129 | return (1); |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * Encode a chunk of pixels. |
| 1134 | * "Standard" case: incoming data is not downsampled. |
| 1135 | */ |
| 1136 | static int |
| 1137 | JPEGEncode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s) |
| 1138 | { |
| 1139 | JPEGState *sp = JState(tif); |
| 1140 | tsize_t nrows; |
| 1141 | JSAMPROW bufptr[1]; |
| 1142 | |
| 1143 | (void) s; |
| 1144 | assert(sp != NULL); |
| 1145 | /* data is expected to be supplied in multiples of a scanline */ |
| 1146 | nrows = cc / sp->bytesperline; |
| 1147 | if (cc % sp->bytesperline) |
| 1148 | TIFFWarning(tif->tif_name, "fractional scanline discarded"); |
| 1149 | |
| 1150 | while (nrows-- > 0) { |
| 1151 | bufptr[0] = (JSAMPROW) buf; |
| 1152 | if (TIFFjpeg_write_scanlines(sp, bufptr, 1) != 1) |
| 1153 | return (0); |
| 1154 | if (nrows > 0) |
| 1155 | tif->tif_row++; |
| 1156 | buf += sp->bytesperline; |
| 1157 | } |
| 1158 | return (1); |
| 1159 | } |
| 1160 | |
| 1161 | /* |
| 1162 | * Encode a chunk of pixels. |
| 1163 | * Incoming data is expected to be downsampled per sampling factors. |
| 1164 | */ |
| 1165 | static int |
| 1166 | JPEGEncodeRaw(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s) |
| 1167 | { |
| 1168 | JPEGState *sp = JState(tif); |
| 1169 | JSAMPLE* inptr; |
| 1170 | JSAMPLE* outptr; |
| 1171 | tsize_t nrows; |
| 1172 | JDIMENSION clumps_per_line, nclump; |
| 1173 | int clumpoffset, ci, xpos, ypos; |
| 1174 | jpeg_component_info* compptr; |
| 1175 | int samples_per_clump = sp->samplesperclump; |
| 1176 | |
| 1177 | (void) s; |
| 1178 | assert(sp != NULL); |
| 1179 | /* data is expected to be supplied in multiples of a scanline */ |
| 1180 | nrows = cc / sp->bytesperline; |
| 1181 | if (cc % sp->bytesperline) |
| 1182 | TIFFWarning(tif->tif_name, "fractional scanline discarded"); |
| 1183 | |
| 1184 | /* Cb,Cr both have sampling factors 1, so this is correct */ |
| 1185 | clumps_per_line = sp->cinfo.c.comp_info[1].downsampled_width; |
| 1186 | |
| 1187 | while (nrows-- > 0) { |
| 1188 | /* |
| 1189 | * Fastest way to separate the data is to make one pass |
| 1190 | * over the scanline for each row of each component. |
| 1191 | */ |
| 1192 | clumpoffset = 0; /* first sample in clump */ |
| 1193 | for (ci = 0, compptr = sp->cinfo.c.comp_info; |
| 1194 | ci < sp->cinfo.c.num_components; |
| 1195 | ci++, compptr++) { |
| 1196 | int hsamp = compptr->h_samp_factor; |
| 1197 | int vsamp = compptr->v_samp_factor; |
| 1198 | int padding = (int) (compptr->width_in_blocks * DCTSIZE - |
| 1199 | clumps_per_line * hsamp); |
| 1200 | for (ypos = 0; ypos < vsamp; ypos++) { |
| 1201 | inptr = ((JSAMPLE*) buf) + clumpoffset; |
| 1202 | outptr = sp->ds_buffer[ci][sp->scancount*vsamp + ypos]; |
| 1203 | if (hsamp == 1) { |
| 1204 | /* fast path for at least Cb and Cr */ |
| 1205 | for (nclump = clumps_per_line; nclump-- > 0; ) { |
| 1206 | *outptr++ = inptr[0]; |
| 1207 | inptr += samples_per_clump; |
| 1208 | } |
| 1209 | } else { |
| 1210 | /* general case */ |
| 1211 | for (nclump = clumps_per_line; nclump-- > 0; ) { |
| 1212 | for (xpos = 0; xpos < hsamp; xpos++) |
| 1213 | *outptr++ = inptr[xpos]; |
| 1214 | inptr += samples_per_clump; |
| 1215 | } |
| 1216 | } |
| 1217 | /* pad each scanline as needed */ |
| 1218 | for (xpos = 0; xpos < padding; xpos++) { |
| 1219 | *outptr = outptr[-1]; |
| 1220 | outptr++; |
| 1221 | } |
| 1222 | clumpoffset += hsamp; |
| 1223 | } |
| 1224 | } |
| 1225 | sp->scancount++; |
| 1226 | if (sp->scancount >= DCTSIZE) { |
| 1227 | int n = sp->cinfo.c.max_v_samp_factor * DCTSIZE; |
| 1228 | if (TIFFjpeg_write_raw_data(sp, sp->ds_buffer, n) != n) |
| 1229 | return (0); |
| 1230 | sp->scancount = 0; |
| 1231 | } |
| 1232 | if (nrows > 0) |
| 1233 | tif->tif_row++; |
| 1234 | buf += sp->bytesperline; |
| 1235 | } |
| 1236 | return (1); |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * Finish up at the end of a strip or tile. |
| 1241 | */ |
| 1242 | static int |
| 1243 | JPEGPostEncode(TIFF* tif) |
| 1244 | { |
| 1245 | JPEGState *sp = JState(tif); |
| 1246 | |
| 1247 | if (sp->scancount > 0) { |
| 1248 | /* |
| 1249 | * Need to emit a partial bufferload of downsampled data. |
| 1250 | * Pad the data vertically. |
| 1251 | */ |
| 1252 | int ci, ypos, n; |
| 1253 | jpeg_component_info* compptr; |
| 1254 | |
| 1255 | for (ci = 0, compptr = sp->cinfo.c.comp_info; |
| 1256 | ci < sp->cinfo.c.num_components; |
| 1257 | ci++, compptr++) { |
| 1258 | int vsamp = compptr->v_samp_factor; |
| 1259 | tsize_t row_width = compptr->width_in_blocks * DCTSIZE |
| 1260 | * sizeof(JSAMPLE); |
| 1261 | for (ypos = sp->scancount * vsamp; |
| 1262 | ypos < DCTSIZE * vsamp; ypos++) { |
| 1263 | _TIFFmemcpy((tdata_t)sp->ds_buffer[ci][ypos], |
| 1264 | (tdata_t)sp->ds_buffer[ci][ypos-1], |
| 1265 | row_width); |
| 1266 | |
| 1267 | } |
| 1268 | } |
| 1269 | n = sp->cinfo.c.max_v_samp_factor * DCTSIZE; |
| 1270 | if (TIFFjpeg_write_raw_data(sp, sp->ds_buffer, n) != n) |
| 1271 | return (0); |
| 1272 | } |
| 1273 | |
| 1274 | return (TIFFjpeg_finish_compress(JState(tif))); |
| 1275 | } |
| 1276 | |
| 1277 | static void |
| 1278 | JPEGCleanup(TIFF* tif) |
| 1279 | { |
| 1280 | if (tif->tif_data) { |
| 1281 | JPEGState *sp = JState(tif); |
| 1282 | TIFFjpeg_destroy(sp); /* release libjpeg resources */ |
| 1283 | if (sp->jpegtables) /* tag value */ |
| 1284 | _TIFFfree(sp->jpegtables); |
| 1285 | _TIFFfree(tif->tif_data); /* release local state */ |
| 1286 | tif->tif_data = NULL; |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | static int |
| 1291 | JPEGVSetField(TIFF* tif, ttag_t tag, va_list ap) |
| 1292 | { |
| 1293 | JPEGState* sp = JState(tif); |
| 1294 | TIFFDirectory* td = &tif->tif_dir; |
| 1295 | uint32 v32; |
| 1296 | |
| 1297 | switch (tag) { |
| 1298 | case TIFFTAG_JPEGTABLES: |
| 1299 | v32 = va_arg(ap, uint32); |
| 1300 | if (v32 == 0) { |
| 1301 | /* XXX */ |
| 1302 | return (0); |
| 1303 | } |
| 1304 | _TIFFsetByteArray(&sp->jpegtables, va_arg(ap, void*), |
| 1305 | (long) v32); |
| 1306 | sp->jpegtables_length = v32; |
| 1307 | TIFFSetFieldBit(tif, FIELD_JPEGTABLES); |
| 1308 | break; |
| 1309 | case TIFFTAG_JPEGQUALITY: |
| 1310 | sp->jpegquality = va_arg(ap, int); |
| 1311 | return (1); /* pseudo tag */ |
| 1312 | case TIFFTAG_JPEGCOLORMODE: |
| 1313 | sp->jpegcolormode = va_arg(ap, int); |
| 1314 | /* |
| 1315 | * Mark whether returned data is up-sampled or not |
| 1316 | * so TIFFStripSize and TIFFTileSize return values |
| 1317 | * that reflect the true amount of data. |
| 1318 | */ |
| 1319 | tif->tif_flags &= ~TIFF_UPSAMPLED; |
| 1320 | if (td->td_planarconfig == PLANARCONFIG_CONTIG) { |
| 1321 | if (td->td_photometric == PHOTOMETRIC_YCBCR && |
| 1322 | sp->jpegcolormode == JPEGCOLORMODE_RGB) { |
| 1323 | tif->tif_flags |= TIFF_UPSAMPLED; |
| 1324 | } else { |
| 1325 | if (td->td_ycbcrsubsampling[0] != 1 || |
| 1326 | td->td_ycbcrsubsampling[1] != 1) |
| 1327 | ; /* XXX what about up-sampling? */ |
| 1328 | } |
| 1329 | } |
| 1330 | /* |
| 1331 | * Must recalculate cached tile size |
| 1332 | * in case sampling state changed. |
| 1333 | */ |
| 1334 | tif->tif_tilesize = TIFFTileSize(tif); |
| 1335 | return (1); /* pseudo tag */ |
| 1336 | case TIFFTAG_JPEGTABLESMODE: |
| 1337 | sp->jpegtablesmode = va_arg(ap, int); |
| 1338 | return (1); /* pseudo tag */ |
| 1339 | default: |
| 1340 | return (*sp->vsetparent)(tif, tag, ap); |
| 1341 | } |
| 1342 | tif->tif_flags |= TIFF_DIRTYDIRECT; |
| 1343 | return (1); |
| 1344 | } |
| 1345 | |
| 1346 | static int |
| 1347 | JPEGVGetField(TIFF* tif, ttag_t tag, va_list ap) |
| 1348 | { |
| 1349 | JPEGState* sp = JState(tif); |
| 1350 | |
| 1351 | switch (tag) { |
| 1352 | case TIFFTAG_JPEGTABLES: |
| 1353 | /* u_short is bogus --- should be uint32 ??? */ |
| 1354 | /* TIFFWriteNormalTag needs fixed XXX */ |
| 1355 | *va_arg(ap, u_short*) = (u_short) sp->jpegtables_length; |
| 1356 | *va_arg(ap, void**) = sp->jpegtables; |
| 1357 | break; |
| 1358 | case TIFFTAG_JPEGQUALITY: |
| 1359 | *va_arg(ap, int*) = sp->jpegquality; |
| 1360 | break; |
| 1361 | case TIFFTAG_JPEGCOLORMODE: |
| 1362 | *va_arg(ap, int*) = sp->jpegcolormode; |
| 1363 | break; |
| 1364 | case TIFFTAG_JPEGTABLESMODE: |
| 1365 | *va_arg(ap, int*) = sp->jpegtablesmode; |
| 1366 | break; |
| 1367 | default: |
| 1368 | return (*sp->vgetparent)(tif, tag, ap); |
| 1369 | } |
| 1370 | return (1); |
| 1371 | } |
| 1372 | |
| 1373 | static void |
| 1374 | JPEGPrintDir(TIFF* tif, FILE* fd, long flags) |
| 1375 | { |
| 1376 | JPEGState* sp = JState(tif); |
| 1377 | |
| 1378 | (void) flags; |
| 1379 | if (TIFFFieldSet(tif,FIELD_JPEGTABLES)) |
| 1380 | fprintf(fd, " JPEG Tables: (%lu bytes)\n", |
| 1381 | (u_long) sp->jpegtables_length); |
| 1382 | } |
| 1383 | |
| 1384 | static uint32 |
| 1385 | JPEGDefaultStripSize(TIFF* tif, uint32 s) |
| 1386 | { |
| 1387 | JPEGState* sp = JState(tif); |
| 1388 | TIFFDirectory *td = &tif->tif_dir; |
| 1389 | |
| 1390 | s = (*sp->defsparent)(tif, s); |
| 1391 | if (s < td->td_imagelength) |
| 1392 | s = TIFFroundup(s, td->td_ycbcrsubsampling[1] * DCTSIZE); |
| 1393 | return (s); |
| 1394 | } |
| 1395 | |
| 1396 | static void |
| 1397 | JPEGDefaultTileSize(TIFF* tif, uint32* tw, uint32* th) |
| 1398 | { |
| 1399 | JPEGState* sp = JState(tif); |
| 1400 | TIFFDirectory *td = &tif->tif_dir; |
| 1401 | |
| 1402 | (*sp->deftparent)(tif, tw, th); |
| 1403 | *tw = TIFFroundup(*tw, td->td_ycbcrsubsampling[0] * DCTSIZE); |
| 1404 | *th = TIFFroundup(*th, td->td_ycbcrsubsampling[1] * DCTSIZE); |
| 1405 | } |
| 1406 | |
| 1407 | int |
| 1408 | TIFFInitJPEG(TIFF* tif, int scheme) |
| 1409 | { |
| 1410 | JPEGState* sp; |
| 1411 | |
| 1412 | assert(scheme == COMPRESSION_JPEG); |
| 1413 | |
| 1414 | /* |
| 1415 | * Allocate state block so tag methods have storage to record values. |
| 1416 | */ |
| 1417 | tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (JPEGState)); |
| 1418 | if (tif->tif_data == NULL) { |
| 1419 | TIFFError("TIFFInitJPEG", "No space for JPEG state block"); |
| 1420 | return (0); |
| 1421 | } |
| 1422 | sp = JState(tif); |
| 1423 | sp->tif = tif; /* back link */ |
| 1424 | |
| 1425 | /* |
| 1426 | * Merge codec-specific tag information and |
| 1427 | * override parent get/set field methods. |
| 1428 | */ |
| 1429 | _TIFFMergeFieldInfo(tif, jpegFieldInfo, N(jpegFieldInfo)); |
| 1430 | sp->vgetparent = tif->tif_vgetfield; |
| 1431 | tif->tif_vgetfield = JPEGVGetField; /* hook for codec tags */ |
| 1432 | sp->vsetparent = tif->tif_vsetfield; |
| 1433 | tif->tif_vsetfield = JPEGVSetField; /* hook for codec tags */ |
| 1434 | tif->tif_printdir = JPEGPrintDir; /* hook for codec tags */ |
| 1435 | |
| 1436 | /* Default values for codec-specific fields */ |
| 1437 | sp->jpegtables = NULL; |
| 1438 | sp->jpegtables_length = 0; |
| 1439 | sp->jpegquality = 75; /* Default IJG quality */ |
| 1440 | sp->jpegcolormode = JPEGCOLORMODE_RAW; |
| 1441 | sp->jpegtablesmode = JPEGTABLESMODE_QUANT | JPEGTABLESMODE_HUFF; |
| 1442 | |
| 1443 | /* |
| 1444 | * Install codec methods. |
| 1445 | */ |
| 1446 | tif->tif_setupdecode = JPEGSetupDecode; |
| 1447 | tif->tif_predecode = JPEGPreDecode; |
| 1448 | tif->tif_decoderow = JPEGDecode; |
| 1449 | tif->tif_decodestrip = JPEGDecode; |
| 1450 | tif->tif_decodetile = JPEGDecode; |
| 1451 | tif->tif_setupencode = JPEGSetupEncode; |
| 1452 | tif->tif_preencode = JPEGPreEncode; |
| 1453 | tif->tif_postencode = JPEGPostEncode; |
| 1454 | tif->tif_encoderow = JPEGEncode; |
| 1455 | tif->tif_encodestrip = JPEGEncode; |
| 1456 | tif->tif_encodetile = JPEGEncode; |
| 1457 | tif->tif_cleanup = JPEGCleanup; |
| 1458 | sp->defsparent = tif->tif_defstripsize; |
| 1459 | tif->tif_defstripsize = JPEGDefaultStripSize; |
| 1460 | sp->deftparent = tif->tif_deftilesize; |
| 1461 | tif->tif_deftilesize = JPEGDefaultTileSize; |
| 1462 | tif->tif_flags |= TIFF_NOBITREV; /* no bit reversal, please */ |
| 1463 | |
| 1464 | /* |
| 1465 | * Initialize libjpeg. |
| 1466 | */ |
| 1467 | if (tif->tif_mode == O_RDONLY) { |
| 1468 | if (!TIFFjpeg_create_decompress(sp)) |
| 1469 | return (0); |
| 1470 | } else { |
| 1471 | if (!TIFFjpeg_create_compress(sp)) |
| 1472 | return (0); |
| 1473 | } |
| 1474 | |
| 1475 | return (1); |
| 1476 | } |
| 1477 | #endif /* JPEG_SUPPORT */ |