Line data Source code
1 : /*
2 : * jcmarker.c
3 : *
4 : * This file was part of the Independent JPEG Group's software:
5 : * Copyright (C) 1991-1998, Thomas G. Lane.
6 : * Modified 2003-2010 by Guido Vollbeding.
7 : * libjpeg-turbo Modifications:
8 : * Copyright (C) 2010, D. R. Commander.
9 : * For conditions of distribution and use, see the accompanying README.ijg
10 : * file.
11 : *
12 : * This file contains routines to write JPEG datastream markers.
13 : */
14 :
15 : #define JPEG_INTERNALS
16 : #include "jinclude.h"
17 : #include "jpeglib.h"
18 : #include "jpegcomp.h"
19 :
20 :
21 : typedef enum { /* JPEG marker codes */
22 : M_SOF0 = 0xc0,
23 : M_SOF1 = 0xc1,
24 : M_SOF2 = 0xc2,
25 : M_SOF3 = 0xc3,
26 :
27 : M_SOF5 = 0xc5,
28 : M_SOF6 = 0xc6,
29 : M_SOF7 = 0xc7,
30 :
31 : M_JPG = 0xc8,
32 : M_SOF9 = 0xc9,
33 : M_SOF10 = 0xca,
34 : M_SOF11 = 0xcb,
35 :
36 : M_SOF13 = 0xcd,
37 : M_SOF14 = 0xce,
38 : M_SOF15 = 0xcf,
39 :
40 : M_DHT = 0xc4,
41 :
42 : M_DAC = 0xcc,
43 :
44 : M_RST0 = 0xd0,
45 : M_RST1 = 0xd1,
46 : M_RST2 = 0xd2,
47 : M_RST3 = 0xd3,
48 : M_RST4 = 0xd4,
49 : M_RST5 = 0xd5,
50 : M_RST6 = 0xd6,
51 : M_RST7 = 0xd7,
52 :
53 : M_SOI = 0xd8,
54 : M_EOI = 0xd9,
55 : M_SOS = 0xda,
56 : M_DQT = 0xdb,
57 : M_DNL = 0xdc,
58 : M_DRI = 0xdd,
59 : M_DHP = 0xde,
60 : M_EXP = 0xdf,
61 :
62 : M_APP0 = 0xe0,
63 : M_APP1 = 0xe1,
64 : M_APP2 = 0xe2,
65 : M_APP3 = 0xe3,
66 : M_APP4 = 0xe4,
67 : M_APP5 = 0xe5,
68 : M_APP6 = 0xe6,
69 : M_APP7 = 0xe7,
70 : M_APP8 = 0xe8,
71 : M_APP9 = 0xe9,
72 : M_APP10 = 0xea,
73 : M_APP11 = 0xeb,
74 : M_APP12 = 0xec,
75 : M_APP13 = 0xed,
76 : M_APP14 = 0xee,
77 : M_APP15 = 0xef,
78 :
79 : M_JPG0 = 0xf0,
80 : M_JPG13 = 0xfd,
81 : M_COM = 0xfe,
82 :
83 : M_TEM = 0x01,
84 :
85 : M_ERROR = 0x100
86 : } JPEG_MARKER;
87 :
88 :
89 : /* Private state */
90 :
91 : typedef struct {
92 : struct jpeg_marker_writer pub; /* public fields */
93 :
94 : unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
95 : } my_marker_writer;
96 :
97 : typedef my_marker_writer *my_marker_ptr;
98 :
99 :
100 : /*
101 : * Basic output routines.
102 : *
103 : * Note that we do not support suspension while writing a marker.
104 : * Therefore, an application using suspension must ensure that there is
105 : * enough buffer space for the initial markers (typ. 600-700 bytes) before
106 : * calling jpeg_start_compress, and enough space to write the trailing EOI
107 : * (a few bytes) before calling jpeg_finish_compress. Multipass compression
108 : * modes are not supported at all with suspension, so those two are the only
109 : * points where markers will be written.
110 : */
111 :
112 : LOCAL(void)
113 0 : emit_byte (j_compress_ptr cinfo, int val)
114 : /* Emit a byte */
115 : {
116 0 : struct jpeg_destination_mgr *dest = cinfo->dest;
117 :
118 0 : *(dest->next_output_byte)++ = (JOCTET) val;
119 0 : if (--dest->free_in_buffer == 0) {
120 0 : if (! (*dest->empty_output_buffer) (cinfo))
121 0 : ERREXIT(cinfo, JERR_CANT_SUSPEND);
122 : }
123 0 : }
124 :
125 :
126 : LOCAL(void)
127 0 : emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
128 : /* Emit a marker code */
129 : {
130 0 : emit_byte(cinfo, 0xFF);
131 0 : emit_byte(cinfo, (int) mark);
132 0 : }
133 :
134 :
135 : LOCAL(void)
136 0 : emit_2bytes (j_compress_ptr cinfo, int value)
137 : /* Emit a 2-byte integer; these are always MSB first in JPEG files */
138 : {
139 0 : emit_byte(cinfo, (value >> 8) & 0xFF);
140 0 : emit_byte(cinfo, value & 0xFF);
141 0 : }
142 :
143 :
144 : /*
145 : * Routines to write specific marker types.
146 : */
147 :
148 : LOCAL(int)
149 0 : emit_dqt (j_compress_ptr cinfo, int index)
150 : /* Emit a DQT marker */
151 : /* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
152 : {
153 0 : JQUANT_TBL *qtbl = cinfo->quant_tbl_ptrs[index];
154 : int prec;
155 : int i;
156 :
157 0 : if (qtbl == NULL)
158 0 : ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
159 :
160 0 : prec = 0;
161 0 : for (i = 0; i < DCTSIZE2; i++) {
162 0 : if (qtbl->quantval[i] > 255)
163 0 : prec = 1;
164 : }
165 :
166 0 : if (! qtbl->sent_table) {
167 0 : emit_marker(cinfo, M_DQT);
168 :
169 0 : emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
170 :
171 0 : emit_byte(cinfo, index + (prec<<4));
172 :
173 0 : for (i = 0; i < DCTSIZE2; i++) {
174 : /* The table entries must be emitted in zigzag order. */
175 0 : unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
176 0 : if (prec)
177 0 : emit_byte(cinfo, (int) (qval >> 8));
178 0 : emit_byte(cinfo, (int) (qval & 0xFF));
179 : }
180 :
181 0 : qtbl->sent_table = TRUE;
182 : }
183 :
184 0 : return prec;
185 : }
186 :
187 :
188 : LOCAL(void)
189 0 : emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
190 : /* Emit a DHT marker */
191 : {
192 : JHUFF_TBL *htbl;
193 : int length, i;
194 :
195 0 : if (is_ac) {
196 0 : htbl = cinfo->ac_huff_tbl_ptrs[index];
197 0 : index += 0x10; /* output index has AC bit set */
198 : } else {
199 0 : htbl = cinfo->dc_huff_tbl_ptrs[index];
200 : }
201 :
202 0 : if (htbl == NULL)
203 0 : ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
204 :
205 0 : if (! htbl->sent_table) {
206 0 : emit_marker(cinfo, M_DHT);
207 :
208 0 : length = 0;
209 0 : for (i = 1; i <= 16; i++)
210 0 : length += htbl->bits[i];
211 :
212 0 : emit_2bytes(cinfo, length + 2 + 1 + 16);
213 0 : emit_byte(cinfo, index);
214 :
215 0 : for (i = 1; i <= 16; i++)
216 0 : emit_byte(cinfo, htbl->bits[i]);
217 :
218 0 : for (i = 0; i < length; i++)
219 0 : emit_byte(cinfo, htbl->huffval[i]);
220 :
221 0 : htbl->sent_table = TRUE;
222 : }
223 0 : }
224 :
225 :
226 : LOCAL(void)
227 0 : emit_dac (j_compress_ptr cinfo)
228 : /* Emit a DAC marker */
229 : /* Since the useful info is so small, we want to emit all the tables in */
230 : /* one DAC marker. Therefore this routine does its own scan of the table. */
231 : {
232 : #ifdef C_ARITH_CODING_SUPPORTED
233 : char dc_in_use[NUM_ARITH_TBLS];
234 : char ac_in_use[NUM_ARITH_TBLS];
235 : int length, i;
236 : jpeg_component_info *compptr;
237 :
238 : for (i = 0; i < NUM_ARITH_TBLS; i++)
239 : dc_in_use[i] = ac_in_use[i] = 0;
240 :
241 : for (i = 0; i < cinfo->comps_in_scan; i++) {
242 : compptr = cinfo->cur_comp_info[i];
243 : /* DC needs no table for refinement scan */
244 : if (cinfo->Ss == 0 && cinfo->Ah == 0)
245 : dc_in_use[compptr->dc_tbl_no] = 1;
246 : /* AC needs no table when not present */
247 : if (cinfo->Se)
248 : ac_in_use[compptr->ac_tbl_no] = 1;
249 : }
250 :
251 : length = 0;
252 : for (i = 0; i < NUM_ARITH_TBLS; i++)
253 : length += dc_in_use[i] + ac_in_use[i];
254 :
255 : if (length) {
256 : emit_marker(cinfo, M_DAC);
257 :
258 : emit_2bytes(cinfo, length*2 + 2);
259 :
260 : for (i = 0; i < NUM_ARITH_TBLS; i++) {
261 : if (dc_in_use[i]) {
262 : emit_byte(cinfo, i);
263 : emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
264 : }
265 : if (ac_in_use[i]) {
266 : emit_byte(cinfo, i + 0x10);
267 : emit_byte(cinfo, cinfo->arith_ac_K[i]);
268 : }
269 : }
270 : }
271 : #endif /* C_ARITH_CODING_SUPPORTED */
272 0 : }
273 :
274 :
275 : LOCAL(void)
276 0 : emit_dri (j_compress_ptr cinfo)
277 : /* Emit a DRI marker */
278 : {
279 0 : emit_marker(cinfo, M_DRI);
280 :
281 0 : emit_2bytes(cinfo, 4); /* fixed length */
282 :
283 0 : emit_2bytes(cinfo, (int) cinfo->restart_interval);
284 0 : }
285 :
286 :
287 : LOCAL(void)
288 0 : emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
289 : /* Emit a SOF marker */
290 : {
291 : int ci;
292 : jpeg_component_info *compptr;
293 :
294 0 : emit_marker(cinfo, code);
295 :
296 0 : emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
297 :
298 : /* Make sure image isn't bigger than SOF field can handle */
299 0 : if ((long) cinfo->_jpeg_height > 65535L ||
300 0 : (long) cinfo->_jpeg_width > 65535L)
301 0 : ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
302 :
303 0 : emit_byte(cinfo, cinfo->data_precision);
304 0 : emit_2bytes(cinfo, (int) cinfo->_jpeg_height);
305 0 : emit_2bytes(cinfo, (int) cinfo->_jpeg_width);
306 :
307 0 : emit_byte(cinfo, cinfo->num_components);
308 :
309 0 : for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
310 0 : ci++, compptr++) {
311 0 : emit_byte(cinfo, compptr->component_id);
312 0 : emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
313 0 : emit_byte(cinfo, compptr->quant_tbl_no);
314 : }
315 0 : }
316 :
317 :
318 : LOCAL(void)
319 0 : emit_sos (j_compress_ptr cinfo)
320 : /* Emit a SOS marker */
321 : {
322 : int i, td, ta;
323 : jpeg_component_info *compptr;
324 :
325 0 : emit_marker(cinfo, M_SOS);
326 :
327 0 : emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
328 :
329 0 : emit_byte(cinfo, cinfo->comps_in_scan);
330 :
331 0 : for (i = 0; i < cinfo->comps_in_scan; i++) {
332 0 : compptr = cinfo->cur_comp_info[i];
333 0 : emit_byte(cinfo, compptr->component_id);
334 :
335 : /* We emit 0 for unused field(s); this is recommended by the P&M text
336 : * but does not seem to be specified in the standard.
337 : */
338 :
339 : /* DC needs no table for refinement scan */
340 0 : td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
341 : /* AC needs no table when not present */
342 0 : ta = cinfo->Se ? compptr->ac_tbl_no : 0;
343 :
344 0 : emit_byte(cinfo, (td << 4) + ta);
345 : }
346 :
347 0 : emit_byte(cinfo, cinfo->Ss);
348 0 : emit_byte(cinfo, cinfo->Se);
349 0 : emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
350 0 : }
351 :
352 :
353 : LOCAL(void)
354 0 : emit_jfif_app0 (j_compress_ptr cinfo)
355 : /* Emit a JFIF-compliant APP0 marker */
356 : {
357 : /*
358 : * Length of APP0 block (2 bytes)
359 : * Block ID (4 bytes - ASCII "JFIF")
360 : * Zero byte (1 byte to terminate the ID string)
361 : * Version Major, Minor (2 bytes - major first)
362 : * Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
363 : * Xdpu (2 bytes - dots per unit horizontal)
364 : * Ydpu (2 bytes - dots per unit vertical)
365 : * Thumbnail X size (1 byte)
366 : * Thumbnail Y size (1 byte)
367 : */
368 :
369 0 : emit_marker(cinfo, M_APP0);
370 :
371 0 : emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
372 :
373 0 : emit_byte(cinfo, 0x4A); /* Identifier: ASCII "JFIF" */
374 0 : emit_byte(cinfo, 0x46);
375 0 : emit_byte(cinfo, 0x49);
376 0 : emit_byte(cinfo, 0x46);
377 0 : emit_byte(cinfo, 0);
378 0 : emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
379 0 : emit_byte(cinfo, cinfo->JFIF_minor_version);
380 0 : emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
381 0 : emit_2bytes(cinfo, (int) cinfo->X_density);
382 0 : emit_2bytes(cinfo, (int) cinfo->Y_density);
383 0 : emit_byte(cinfo, 0); /* No thumbnail image */
384 0 : emit_byte(cinfo, 0);
385 0 : }
386 :
387 :
388 : LOCAL(void)
389 0 : emit_adobe_app14 (j_compress_ptr cinfo)
390 : /* Emit an Adobe APP14 marker */
391 : {
392 : /*
393 : * Length of APP14 block (2 bytes)
394 : * Block ID (5 bytes - ASCII "Adobe")
395 : * Version Number (2 bytes - currently 100)
396 : * Flags0 (2 bytes - currently 0)
397 : * Flags1 (2 bytes - currently 0)
398 : * Color transform (1 byte)
399 : *
400 : * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
401 : * now in circulation seem to use Version = 100, so that's what we write.
402 : *
403 : * We write the color transform byte as 1 if the JPEG color space is
404 : * YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with
405 : * whether the encoder performed a transformation, which is pretty useless.
406 : */
407 :
408 0 : emit_marker(cinfo, M_APP14);
409 :
410 0 : emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
411 :
412 0 : emit_byte(cinfo, 0x41); /* Identifier: ASCII "Adobe" */
413 0 : emit_byte(cinfo, 0x64);
414 0 : emit_byte(cinfo, 0x6F);
415 0 : emit_byte(cinfo, 0x62);
416 0 : emit_byte(cinfo, 0x65);
417 0 : emit_2bytes(cinfo, 100); /* Version */
418 0 : emit_2bytes(cinfo, 0); /* Flags0 */
419 0 : emit_2bytes(cinfo, 0); /* Flags1 */
420 0 : switch (cinfo->jpeg_color_space) {
421 : case JCS_YCbCr:
422 0 : emit_byte(cinfo, 1); /* Color transform = 1 */
423 0 : break;
424 : case JCS_YCCK:
425 0 : emit_byte(cinfo, 2); /* Color transform = 2 */
426 0 : break;
427 : default:
428 0 : emit_byte(cinfo, 0); /* Color transform = 0 */
429 0 : break;
430 : }
431 0 : }
432 :
433 :
434 : /*
435 : * These routines allow writing an arbitrary marker with parameters.
436 : * The only intended use is to emit COM or APPn markers after calling
437 : * write_file_header and before calling write_frame_header.
438 : * Other uses are not guaranteed to produce desirable results.
439 : * Counting the parameter bytes properly is the caller's responsibility.
440 : */
441 :
442 : METHODDEF(void)
443 0 : write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
444 : /* Emit an arbitrary marker header */
445 : {
446 0 : if (datalen > (unsigned int) 65533) /* safety check */
447 0 : ERREXIT(cinfo, JERR_BAD_LENGTH);
448 :
449 0 : emit_marker(cinfo, (JPEG_MARKER) marker);
450 :
451 0 : emit_2bytes(cinfo, (int) (datalen + 2)); /* total length */
452 0 : }
453 :
454 : METHODDEF(void)
455 0 : write_marker_byte (j_compress_ptr cinfo, int val)
456 : /* Emit one byte of marker parameters following write_marker_header */
457 : {
458 0 : emit_byte(cinfo, val);
459 0 : }
460 :
461 :
462 : /*
463 : * Write datastream header.
464 : * This consists of an SOI and optional APPn markers.
465 : * We recommend use of the JFIF marker, but not the Adobe marker,
466 : * when using YCbCr or grayscale data. The JFIF marker should NOT
467 : * be used for any other JPEG colorspace. The Adobe marker is helpful
468 : * to distinguish RGB, CMYK, and YCCK colorspaces.
469 : * Note that an application can write additional header markers after
470 : * jpeg_start_compress returns.
471 : */
472 :
473 : METHODDEF(void)
474 0 : write_file_header (j_compress_ptr cinfo)
475 : {
476 0 : my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
477 :
478 0 : emit_marker(cinfo, M_SOI); /* first the SOI */
479 :
480 : /* SOI is defined to reset restart interval to 0 */
481 0 : marker->last_restart_interval = 0;
482 :
483 0 : if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
484 0 : emit_jfif_app0(cinfo);
485 0 : if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
486 0 : emit_adobe_app14(cinfo);
487 0 : }
488 :
489 :
490 : /*
491 : * Write frame header.
492 : * This consists of DQT and SOFn markers.
493 : * Note that we do not emit the SOF until we have emitted the DQT(s).
494 : * This avoids compatibility problems with incorrect implementations that
495 : * try to error-check the quant table numbers as soon as they see the SOF.
496 : */
497 :
498 : METHODDEF(void)
499 0 : write_frame_header (j_compress_ptr cinfo)
500 : {
501 : int ci, prec;
502 : boolean is_baseline;
503 : jpeg_component_info *compptr;
504 :
505 : /* Emit DQT for each quantization table.
506 : * Note that emit_dqt() suppresses any duplicate tables.
507 : */
508 0 : prec = 0;
509 0 : for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
510 0 : ci++, compptr++) {
511 0 : prec += emit_dqt(cinfo, compptr->quant_tbl_no);
512 : }
513 : /* now prec is nonzero iff there are any 16-bit quant tables. */
514 :
515 : /* Check for a non-baseline specification.
516 : * Note we assume that Huffman table numbers won't be changed later.
517 : */
518 0 : if (cinfo->arith_code || cinfo->progressive_mode ||
519 0 : cinfo->data_precision != 8) {
520 0 : is_baseline = FALSE;
521 : } else {
522 0 : is_baseline = TRUE;
523 0 : for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
524 0 : ci++, compptr++) {
525 0 : if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
526 0 : is_baseline = FALSE;
527 : }
528 0 : if (prec && is_baseline) {
529 0 : is_baseline = FALSE;
530 : /* If it's baseline except for quantizer size, warn the user */
531 0 : TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
532 : }
533 : }
534 :
535 : /* Emit the proper SOF marker */
536 0 : if (cinfo->arith_code) {
537 0 : if (cinfo->progressive_mode)
538 0 : emit_sof(cinfo, M_SOF10); /* SOF code for progressive arithmetic */
539 : else
540 0 : emit_sof(cinfo, M_SOF9); /* SOF code for sequential arithmetic */
541 : } else {
542 0 : if (cinfo->progressive_mode)
543 0 : emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */
544 0 : else if (is_baseline)
545 0 : emit_sof(cinfo, M_SOF0); /* SOF code for baseline implementation */
546 : else
547 0 : emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
548 : }
549 0 : }
550 :
551 :
552 : /*
553 : * Write scan header.
554 : * This consists of DHT or DAC markers, optional DRI, and SOS.
555 : * Compressed data will be written following the SOS.
556 : */
557 :
558 : METHODDEF(void)
559 0 : write_scan_header (j_compress_ptr cinfo)
560 : {
561 0 : my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
562 : int i;
563 : jpeg_component_info *compptr;
564 :
565 0 : if (cinfo->arith_code) {
566 : /* Emit arith conditioning info. We may have some duplication
567 : * if the file has multiple scans, but it's so small it's hardly
568 : * worth worrying about.
569 : */
570 0 : emit_dac(cinfo);
571 : } else {
572 : /* Emit Huffman tables.
573 : * Note that emit_dht() suppresses any duplicate tables.
574 : */
575 0 : for (i = 0; i < cinfo->comps_in_scan; i++) {
576 0 : compptr = cinfo->cur_comp_info[i];
577 : /* DC needs no table for refinement scan */
578 0 : if (cinfo->Ss == 0 && cinfo->Ah == 0)
579 0 : emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
580 : /* AC needs no table when not present */
581 0 : if (cinfo->Se)
582 0 : emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
583 : }
584 : }
585 :
586 : /* Emit DRI if required --- note that DRI value could change for each scan.
587 : * We avoid wasting space with unnecessary DRIs, however.
588 : */
589 0 : if (cinfo->restart_interval != marker->last_restart_interval) {
590 0 : emit_dri(cinfo);
591 0 : marker->last_restart_interval = cinfo->restart_interval;
592 : }
593 :
594 0 : emit_sos(cinfo);
595 0 : }
596 :
597 :
598 : /*
599 : * Write datastream trailer.
600 : */
601 :
602 : METHODDEF(void)
603 0 : write_file_trailer (j_compress_ptr cinfo)
604 : {
605 0 : emit_marker(cinfo, M_EOI);
606 0 : }
607 :
608 :
609 : /*
610 : * Write an abbreviated table-specification datastream.
611 : * This consists of SOI, DQT and DHT tables, and EOI.
612 : * Any table that is defined and not marked sent_table = TRUE will be
613 : * emitted. Note that all tables will be marked sent_table = TRUE at exit.
614 : */
615 :
616 : METHODDEF(void)
617 0 : write_tables_only (j_compress_ptr cinfo)
618 : {
619 : int i;
620 :
621 0 : emit_marker(cinfo, M_SOI);
622 :
623 0 : for (i = 0; i < NUM_QUANT_TBLS; i++) {
624 0 : if (cinfo->quant_tbl_ptrs[i] != NULL)
625 0 : (void) emit_dqt(cinfo, i);
626 : }
627 :
628 0 : if (! cinfo->arith_code) {
629 0 : for (i = 0; i < NUM_HUFF_TBLS; i++) {
630 0 : if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
631 0 : emit_dht(cinfo, i, FALSE);
632 0 : if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
633 0 : emit_dht(cinfo, i, TRUE);
634 : }
635 : }
636 :
637 0 : emit_marker(cinfo, M_EOI);
638 0 : }
639 :
640 :
641 : /*
642 : * Initialize the marker writer module.
643 : */
644 :
645 : GLOBAL(void)
646 0 : jinit_marker_writer (j_compress_ptr cinfo)
647 : {
648 : my_marker_ptr marker;
649 :
650 : /* Create the subobject */
651 0 : marker = (my_marker_ptr)
652 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
653 : sizeof(my_marker_writer));
654 0 : cinfo->marker = (struct jpeg_marker_writer *) marker;
655 : /* Initialize method pointers */
656 0 : marker->pub.write_file_header = write_file_header;
657 0 : marker->pub.write_frame_header = write_frame_header;
658 0 : marker->pub.write_scan_header = write_scan_header;
659 0 : marker->pub.write_file_trailer = write_file_trailer;
660 0 : marker->pub.write_tables_only = write_tables_only;
661 0 : marker->pub.write_marker_header = write_marker_header;
662 0 : marker->pub.write_marker_byte = write_marker_byte;
663 : /* Initialize private state */
664 0 : marker->last_restart_interval = 0;
665 0 : }
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