source: trunk/src/3rdparty/libmng/libmng_jpeg.c

Last change on this file was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 43.4 KB
Line 
1/* ************************************************************************** */
2/* * For conditions of distribution and use, * */
3/* * see copyright notice in libmng.h * */
4/* ************************************************************************** */
5/* * * */
6/* * project : libmng * */
7/* * file : libmng_jpeg.c copyright (c) 2000-2004 G.Juyn * */
8/* * version : 1.0.9 * */
9/* * * */
10/* * purpose : JPEG library interface (implementation) * */
11/* * * */
12/* * author : G.Juyn * */
13/* * * */
14/* * comment : implementation of the JPEG library interface * */
15/* * * */
16/* * changes : 0.5.1 - 05/08/2000 - G.Juyn * */
17/* * - changed strict-ANSI stuff * */
18/* * * */
19/* * 0.5.2 - 05/22/2000 - G.Juyn * */
20/* * - implemented all the JNG routines * */
21/* * * */
22/* * 0.5.3 - 06/17/2000 - G.Juyn * */
23/* * - added tracing of JPEG calls * */
24/* * 0.5.3 - 06/24/2000 - G.Juyn * */
25/* * - fixed inclusion of IJG read/write code * */
26/* * 0.5.3 - 06/29/2000 - G.Juyn * */
27/* * - fixed some 64-bit warnings * */
28/* * * */
29/* * 0.9.2 - 08/05/2000 - G.Juyn * */
30/* * - changed file-prefixes * */
31/* * * */
32/* * 0.9.3 - 10/16/2000 - G.Juyn * */
33/* * - added support for JDAA * */
34/* * * */
35/* * 1.0.1 - 04/19/2001 - G.Juyn * */
36/* * - added export of JPEG functions for DLL * */
37/* * 1.0.1 - 04/22/2001 - G.Juyn * */
38/* * - fixed memory-leaks (Thanks Gregg!) * */
39/* * * */
40/* * 1.0.4 - 06/22/2002 - G.Juyn * */
41/* * - B526138 - returned IJGSRC6B calling convention to * */
42/* * default for MSVC * */
43/* * * */
44/* * 1.0.5 - 24/02/2003 - G.Juyn * */
45/* * - B683152 - libjpeg suspension not always honored correctly* */
46/* * * */
47/* * 1.0.6 - 03/04/2003 - G.Juyn * */
48/* * - fixed some compiler-warnings * */
49/* * * */
50/* * 1.0.8 - 08/01/2004 - G.Juyn * */
51/* * - added support for 3+byte pixelsize for JPEG's * */
52/* * * */
53/* * 1.0.9 - 12/20/2004 - G.Juyn * */
54/* * - cleaned up macro-invocations (thanks to D. Airlie) * */
55/* * * */
56/* ************************************************************************** */
57
58#include "libmng.h"
59#include "libmng_data.h"
60#include "libmng_error.h"
61#include "libmng_trace.h"
62#ifdef __BORLANDC__
63#pragma hdrstop
64#endif
65#include "libmng_memory.h"
66#include "libmng_pixels.h"
67#include "libmng_jpeg.h"
68
69#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
70#pragma option -A /* force ANSI-C */
71#endif
72
73/* ************************************************************************** */
74
75#if defined(MNG_INCLUDE_JNG) && defined(MNG_INCLUDE_DISPLAY_PROCS)
76
77/* ************************************************************************** */
78/* * * */
79/* * Local IJG callback routines (source-manager, error-manager and such) * */
80/* * * */
81/* ************************************************************************** */
82
83#ifdef MNG_INCLUDE_IJG6B
84
85/* ************************************************************************** */
86
87#ifdef MNG_INCLUDE_JNG_READ
88#ifdef MNG_DEFINE_JPEG_STDCALL
89void MNG_DECL mng_init_source (j_decompress_ptr cinfo)
90#else
91void mng_init_source (j_decompress_ptr cinfo)
92#endif
93{
94 return; /* nothing needed */
95}
96#endif /* MNG_INCLUDE_JNG_READ */
97
98/* ************************************************************************** */
99
100#ifdef MNG_INCLUDE_JNG_READ
101#ifdef MNG_DEFINE_JPEG_STDCALL
102boolean MNG_DECL mng_fill_input_buffer (j_decompress_ptr cinfo)
103#else
104boolean mng_fill_input_buffer (j_decompress_ptr cinfo)
105#endif
106{
107 return FALSE; /* force IJG routine to return to caller */
108}
109#endif /* MNG_INCLUDE_JNG_READ */
110
111/* ************************************************************************** */
112
113#ifdef MNG_INCLUDE_JNG_READ
114#ifdef MNG_DEFINE_JPEG_STDCALL
115void MNG_DECL mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
116#else
117void mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
118#endif
119{
120 if (num_bytes > 0) /* ignore fony calls */
121 { /* address my generic structure */
122 mng_datap pData = (mng_datap)cinfo->client_data;
123 /* address source manager */
124 mngjpeg_sourcep pSrc = pData->pJPEGdinfo->src;
125 /* problem scenario ? */
126 if (pSrc->bytes_in_buffer < (size_t)num_bytes)
127 { /* tell the boss we need to skip some data! */
128 pData->iJPEGtoskip = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer);
129
130 pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */
131 pSrc->next_input_byte = MNG_NULL;
132 }
133 else
134 { /* simply advance in the buffer */
135 pSrc->bytes_in_buffer -= num_bytes;
136 pSrc->next_input_byte += num_bytes;
137 }
138 }
139
140 return;
141}
142#endif /* MNG_INCLUDE_JNG_READ */
143
144/* ************************************************************************** */
145
146#ifdef MNG_INCLUDE_JNG_READ
147#ifdef MNG_DEFINE_JPEG_STDCALL
148void MNG_DECL mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes)
149#else
150void mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes)
151#endif
152{
153 if (num_bytes > 0) /* ignore fony calls */
154 { /* address my generic structure */
155 mng_datap pData = (mng_datap)cinfo->client_data;
156 /* address source manager */
157 mngjpeg_sourcep pSrc = pData->pJPEGdinfo2->src;
158 /* problem scenario ? */
159 if (pSrc->bytes_in_buffer < (size_t)num_bytes)
160 { /* tell the boss we need to skip some data! */
161 pData->iJPEGtoskip2 = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer);
162
163 pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */
164 pSrc->next_input_byte = MNG_NULL;
165 }
166 else
167 { /* simply advance in the buffer */
168 pSrc->bytes_in_buffer -= num_bytes;
169 pSrc->next_input_byte += num_bytes;
170 }
171 }
172
173 return;
174}
175#endif /* MNG_INCLUDE_JNG_READ */
176
177/* ************************************************************************** */
178
179#ifdef MNG_INCLUDE_JNG_READ
180#ifdef MNG_DEFINE_JPEG_STDCALL
181void MNG_DECL mng_term_source (j_decompress_ptr cinfo)
182#else
183void mng_term_source (j_decompress_ptr cinfo)
184#endif
185{
186 return; /* nothing needed */
187}
188#endif /* MNG_INCLUDE_JNG_READ */
189
190/* ************************************************************************** */
191
192#ifdef MNG_USE_SETJMP
193#ifdef MNG_DEFINE_JPEG_STDCALL
194void MNG_DECL mng_error_exit (j_common_ptr cinfo)
195#else
196void mng_error_exit (j_common_ptr cinfo)
197#endif
198{ /* address my generic structure */
199 mng_datap pData = (mng_datap)cinfo->client_data;
200
201#ifdef MNG_ERROR_TELLTALE /* fill the message text ??? */
202 (*cinfo->err->output_message) (cinfo);
203#endif
204 /* return to the point of no return... */
205 longjmp (pData->sErrorbuf, cinfo->err->msg_code);
206}
207#endif /* MNG_USE_SETJMP */
208
209/* ************************************************************************** */
210
211#ifdef MNG_USE_SETJMP
212#ifdef MNG_DEFINE_JPEG_STDCALL
213void MNG_DECL mng_output_message (j_common_ptr cinfo)
214#else
215void mng_output_message (j_common_ptr cinfo)
216#endif
217{
218 return; /* just do nothing ! */
219}
220#endif /* MNG_USE_SETJMP */
221
222/* ************************************************************************** */
223
224#endif /* MNG_INCLUDE_IJG6B */
225
226/* ************************************************************************** */
227/* * * */
228/* * Global JPEG routines * */
229/* * * */
230/* ************************************************************************** */
231
232mng_retcode mngjpeg_initialize (mng_datap pData)
233{
234#ifdef MNG_SUPPORT_TRACE
235 MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_START);
236#endif
237 /* allocate space for JPEG structures if necessary */
238#ifdef MNG_INCLUDE_JNG_READ
239 if (pData->pJPEGderr == MNG_NULL)
240 MNG_ALLOC (pData, pData->pJPEGderr, sizeof (mngjpeg_error ));
241 if (pData->pJPEGdsrc == MNG_NULL)
242 MNG_ALLOC (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source));
243 if (pData->pJPEGdinfo == MNG_NULL)
244 MNG_ALLOC (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp));
245 /* enable reverse addressing */
246 pData->pJPEGdinfo->client_data = pData;
247
248 if (pData->pJPEGderr2 == MNG_NULL)
249 MNG_ALLOC (pData, pData->pJPEGderr2, sizeof (mngjpeg_error ));
250 if (pData->pJPEGdsrc2 == MNG_NULL)
251 MNG_ALLOC (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source));
252 if (pData->pJPEGdinfo2 == MNG_NULL)
253 MNG_ALLOC (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp));
254 /* enable reverse addressing */
255 pData->pJPEGdinfo2->client_data = pData;
256#endif
257
258#ifdef MNG_INCLUDE_JNG_WRITE
259 if (pData->pJPEGcerr == MNG_NULL)
260 MNG_ALLOC (pData, pData->pJPEGcerr, sizeof (mngjpeg_error ));
261 if (pData->pJPEGcinfo == MNG_NULL)
262 MNG_ALLOC (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp ));
263 /* enable reverse addressing */
264 pData->pJPEGcinfo->client_data = pData;
265#endif
266
267 if (pData->pJPEGbuf == MNG_NULL) /* initialize temporary buffers */
268 {
269 pData->iJPEGbufmax = MNG_JPEG_MAXBUF;
270 MNG_ALLOC (pData, pData->pJPEGbuf, pData->iJPEGbufmax);
271 }
272
273 if (pData->pJPEGbuf2 == MNG_NULL)
274 {
275 pData->iJPEGbufmax2 = MNG_JPEG_MAXBUF;
276 MNG_ALLOC (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2);
277 }
278
279 pData->pJPEGcurrent = pData->pJPEGbuf;
280 pData->iJPEGbufremain = 0;
281 pData->pJPEGrow = MNG_NULL;
282 pData->iJPEGrowlen = 0;
283 pData->iJPEGtoskip = 0;
284
285 pData->pJPEGcurrent2 = pData->pJPEGbuf2;
286 pData->iJPEGbufremain2 = 0;
287 pData->pJPEGrow2 = MNG_NULL;
288 pData->iJPEGrowlen2 = 0;
289 pData->iJPEGtoskip2 = 0;
290 /* not doing anything yet ! */
291 pData->bJPEGcompress = MNG_FALSE;
292
293 pData->bJPEGdecompress = MNG_FALSE;
294 pData->bJPEGhasheader = MNG_FALSE;
295 pData->bJPEGdecostarted = MNG_FALSE;
296 pData->bJPEGscanstarted = MNG_FALSE;
297 pData->bJPEGscanending = MNG_FALSE;
298
299 pData->bJPEGdecompress2 = MNG_FALSE;
300 pData->bJPEGhasheader2 = MNG_FALSE;
301 pData->bJPEGdecostarted2 = MNG_FALSE;
302 pData->bJPEGscanstarted2 = MNG_FALSE;
303
304 pData->iJPEGrow = 0; /* zero input/output lines */
305 pData->iJPEGalpharow = 0;
306 pData->iJPEGrgbrow = 0;
307 pData->iJPEGdisprow = 0;
308
309#ifdef MNG_SUPPORT_TRACE
310 MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_END);
311#endif
312
313 return MNG_NOERROR;
314}
315
316/* ************************************************************************** */
317
318mng_retcode mngjpeg_cleanup (mng_datap pData)
319{
320#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
321 mng_retcode iRetcode;
322#endif
323
324#ifdef MNG_SUPPORT_TRACE
325 MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_START);
326#endif
327
328#ifdef MNG_INCLUDE_IJG6B
329#ifdef MNG_USE_SETJMP
330 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
331 if (iRetcode != 0) /* got here from longjmp ? */
332 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
333#endif
334
335#ifdef MNG_INCLUDE_JNG_READ /* still decompressing something ? */
336 if (pData->bJPEGdecompress)
337 jpeg_destroy_decompress (pData->pJPEGdinfo);
338 if (pData->bJPEGdecompress2)
339 jpeg_destroy_decompress (pData->pJPEGdinfo2);
340#endif
341
342#ifdef MNG_INCLUDE_JNG_WRITE
343 if (pData->bJPEGcompress) /* still compressing something ? */
344 jpeg_destroy_compress (pData->pJPEGcinfo);
345#endif
346
347#endif /* MNG_INCLUDE_IJG6B */
348 /* cleanup temporary buffers */
349 MNG_FREE (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2);
350 MNG_FREE (pData, pData->pJPEGbuf, pData->iJPEGbufmax);
351 /* cleanup space for JPEG structures */
352#ifdef MNG_INCLUDE_JNG_WRITE
353 MNG_FREE (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp ));
354 MNG_FREE (pData, pData->pJPEGcerr, sizeof (mngjpeg_error ));
355#endif
356
357#ifdef MNG_INCLUDE_JNG_READ
358 MNG_FREE (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp));
359 MNG_FREE (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source));
360 MNG_FREE (pData, pData->pJPEGderr, sizeof (mngjpeg_error ));
361 MNG_FREE (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp));
362 MNG_FREE (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source));
363 MNG_FREE (pData, pData->pJPEGderr2, sizeof (mngjpeg_error ));
364#endif
365
366 MNG_FREE (pData, pData->pJPEGrow2, pData->iJPEGrowlen2);
367 MNG_FREE (pData, pData->pJPEGrow, pData->iJPEGrowlen);
368 /* whatever we were doing ... */
369 /* we don't anymore ... */
370 pData->bJPEGcompress = MNG_FALSE;
371
372 pData->bJPEGdecompress = MNG_FALSE;
373 pData->bJPEGhasheader = MNG_FALSE;
374 pData->bJPEGdecostarted = MNG_FALSE;
375 pData->bJPEGscanstarted = MNG_FALSE;
376 pData->bJPEGscanending = MNG_FALSE;
377
378 pData->bJPEGdecompress2 = MNG_FALSE;
379 pData->bJPEGhasheader2 = MNG_FALSE;
380 pData->bJPEGdecostarted2 = MNG_FALSE;
381 pData->bJPEGscanstarted2 = MNG_FALSE;
382
383#ifdef MNG_SUPPORT_TRACE
384 MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_END);
385#endif
386
387 return MNG_NOERROR;
388}
389
390/* ************************************************************************** */
391/* * * */
392/* * JPEG decompression routines (JDAT) * */
393/* * * */
394/* ************************************************************************** */
395
396#ifdef MNG_INCLUDE_JNG_READ
397mng_retcode mngjpeg_decompressinit (mng_datap pData)
398{
399#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
400 mng_retcode iRetcode;
401#endif
402
403#ifdef MNG_SUPPORT_TRACE
404 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_START);
405#endif
406
407#ifdef MNG_INCLUDE_IJG6B
408 /* allocate and initialize a JPEG decompression object */
409 pData->pJPEGdinfo->err = jpeg_std_error (pData->pJPEGderr);
410
411#ifdef MNG_USE_SETJMP /* setup local JPEG error-routines */
412 pData->pJPEGderr->error_exit = mng_error_exit;
413 pData->pJPEGderr->output_message = mng_output_message;
414
415 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
416 if (iRetcode != 0) /* got here from longjmp ? */
417 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
418#endif /* MNG_USE_SETJMP */
419
420 /* allocate and initialize a JPEG decompression object (continued) */
421#ifdef MNG_SUPPORT_TRACE
422 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_JPEG_CREATE_DECOMPRESS)
423#endif
424 jpeg_create_decompress (pData->pJPEGdinfo);
425
426 pData->bJPEGdecompress = MNG_TRUE; /* indicate it's initialized */
427
428 /* specify the source of the compressed data (eg, a file) */
429 /* no, not a file; we have buffered input */
430 pData->pJPEGdinfo->src = pData->pJPEGdsrc;
431 /* use the default handler */
432 pData->pJPEGdinfo->src->resync_to_restart = jpeg_resync_to_restart;
433 /* setup local source routine & parms */
434 pData->pJPEGdinfo->src->init_source = mng_init_source;
435 pData->pJPEGdinfo->src->fill_input_buffer = mng_fill_input_buffer;
436 pData->pJPEGdinfo->src->skip_input_data = mng_skip_input_data;
437 pData->pJPEGdinfo->src->term_source = mng_term_source;
438 pData->pJPEGdinfo->src->next_input_byte = pData->pJPEGcurrent;
439 pData->pJPEGdinfo->src->bytes_in_buffer = pData->iJPEGbufremain;
440
441#endif /* MNG_INCLUDE_IJG6B */
442
443#ifdef MNG_SUPPORT_TRACE
444 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_END);
445#endif
446
447 return MNG_NOERROR;
448}
449#endif /* MNG_INCLUDE_JNG_READ */
450
451/* ************************************************************************** */
452
453#ifdef MNG_INCLUDE_JNG_READ
454mng_retcode mngjpeg_decompressdata (mng_datap pData,
455 mng_uint32 iRawsize,
456 mng_uint8p pRawdata)
457{
458 mng_retcode iRetcode;
459 mng_uint32 iRemain;
460 mng_uint8p pWork;
461
462#ifdef MNG_SUPPORT_TRACE
463 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_START);
464#endif
465
466#if defined (MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
467 iRetcode = setjmp (pData->sErrorbuf);/* initialize local JPEG error-recovery */
468 if (iRetcode != 0) /* got here from longjmp ? */
469 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
470#endif
471
472 pWork = pRawdata;
473 iRemain = iRawsize;
474
475 if (pData->iJPEGtoskip) /* JPEG-lib told us to skip some more data ? */
476 {
477 if (iRemain > pData->iJPEGtoskip) /* enough data in this buffer ? */
478 {
479 iRemain -= pData->iJPEGtoskip; /* skip enough to access the next byte */
480 pWork += pData->iJPEGtoskip;
481
482 pData->iJPEGtoskip = 0; /* no more to skip then */
483 }
484 else
485 {
486 pData->iJPEGtoskip -= iRemain; /* skip all data in the buffer */
487 iRemain = 0; /* and indicate this accordingly */
488 }
489 /* the skip set current-pointer to NULL ! */
490 pData->pJPEGcurrent = pData->pJPEGbuf;
491 }
492
493 while (iRemain) /* repeat until no more input-bytes */
494 { /* need to shift anything ? */
495 if ((pData->pJPEGcurrent > pData->pJPEGbuf) &&
496 (pData->pJPEGcurrent - pData->pJPEGbuf + pData->iJPEGbufremain + iRemain > pData->iJPEGbufmax))
497 {
498 if (pData->iJPEGbufremain > 0) /* then do so */
499 MNG_COPY (pData->pJPEGbuf, pData->pJPEGcurrent, pData->iJPEGbufremain);
500
501 pData->pJPEGcurrent = pData->pJPEGbuf;
502 }
503 /* does the remaining input fit into the buffer ? */
504 if (pData->iJPEGbufremain + iRemain <= pData->iJPEGbufmax)
505 { /* move the lot */
506 MNG_COPY ((pData->pJPEGcurrent + pData->iJPEGbufremain), pWork, iRemain);
507
508 pData->iJPEGbufremain += iRemain;/* adjust remaining_bytes counter */
509 iRemain = 0; /* and indicate there's no input left */
510 }
511 else
512 { /* calculate what does fit */
513 mng_uint32 iFits = pData->iJPEGbufmax - pData->iJPEGbufremain;
514
515 if (iFits <= 0) /* no space is just bugger 'm all */
516 MNG_ERROR (pData, MNG_JPEGBUFTOOSMALL);
517 /* move that */
518 MNG_COPY ((pData->pJPEGcurrent + pData->iJPEGbufremain), pWork, iFits);
519
520 pData->iJPEGbufremain += iFits; /* adjust remain_bytes counter */
521 iRemain -= iFits; /* and the input-parms */
522 pWork += iFits;
523 }
524
525#ifdef MNG_INCLUDE_IJG6B
526 pData->pJPEGdinfo->src->next_input_byte = pData->pJPEGcurrent;
527 pData->pJPEGdinfo->src->bytes_in_buffer = pData->iJPEGbufremain;
528
529 if (!pData->bJPEGhasheader) /* haven't got the header yet ? */
530 {
531 /* call jpeg_read_header() to obtain image info */
532#ifdef MNG_SUPPORT_TRACE
533 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_HEADER)
534#endif
535 if (jpeg_read_header (pData->pJPEGdinfo, TRUE) != JPEG_SUSPENDED)
536 { /* indicate the header's oke */
537 pData->bJPEGhasheader = MNG_TRUE;
538 /* let's do some sanity checks ! */
539 if ((pData->pJPEGdinfo->image_width != pData->iDatawidth ) ||
540 (pData->pJPEGdinfo->image_height != pData->iDataheight) )
541 MNG_ERROR (pData, MNG_JPEGPARMSERR);
542
543 if ( ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAY ) ||
544 (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA) ) &&
545 (pData->pJPEGdinfo->jpeg_color_space != JCS_GRAYSCALE ) )
546 MNG_ERROR (pData, MNG_JPEGPARMSERR);
547
548 if ( ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLOR ) ||
549 (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA) ) &&
550 (pData->pJPEGdinfo->jpeg_color_space != JCS_YCbCr ) )
551 MNG_ERROR (pData, MNG_JPEGPARMSERR);
552 /* indicate whether or not it's progressive */
553 pData->bJPEGprogressive = (mng_bool)jpeg_has_multiple_scans (pData->pJPEGdinfo);
554 /* progressive+alpha can't display "on-the-fly"!! */
555 if ((pData->bJPEGprogressive) &&
556 ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA ) ||
557 (pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA) ))
558 pData->fDisplayrow = MNG_NULL;
559 /* allocate a row of JPEG-samples */
560 if (pData->pJPEGdinfo->jpeg_color_space == JCS_YCbCr)
561 pData->iJPEGrowlen = pData->pJPEGdinfo->image_width * RGB_PIXELSIZE;
562 else
563 pData->iJPEGrowlen = pData->pJPEGdinfo->image_width;
564
565 MNG_ALLOC (pData, pData->pJPEGrow, pData->iJPEGrowlen);
566
567 pData->iJPEGrgbrow = 0; /* quite empty up to now */
568 }
569
570 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
571 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
572 }
573 /* decompress not started ? */
574 if ((pData->bJPEGhasheader) && (!pData->bJPEGdecostarted))
575 {
576 /* set parameters for decompression */
577
578 if (pData->bJPEGprogressive) /* progressive display ? */
579 pData->pJPEGdinfo->buffered_image = TRUE;
580
581 /* jpeg_start_decompress(...); */
582#ifdef MNG_SUPPORT_TRACE
583 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_DECOMPRESS)
584#endif
585 if (jpeg_start_decompress (pData->pJPEGdinfo) == TRUE)
586 /* indicate it started */
587 pData->bJPEGdecostarted = MNG_TRUE;
588
589 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
590 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
591 }
592 /* process some scanlines ? */
593 if ((pData->bJPEGhasheader) && (pData->bJPEGdecostarted) &&
594 ((!jpeg_input_complete (pData->pJPEGdinfo)) ||
595 (pData->pJPEGdinfo->output_scanline < pData->pJPEGdinfo->output_height) ||
596 ((pData->bJPEGprogressive) && (pData->bJPEGscanending))))
597 {
598 mng_int32 iLines = 0;
599
600 /* for (each output pass) */
601 do
602 { /* address the row output buffer */
603 JSAMPROW pRow = (JSAMPROW)pData->pJPEGrow;
604
605 /* init new pass ? */
606 if ((pData->bJPEGprogressive) && (!pData->bJPEGscanstarted))
607 {
608 pData->bJPEGscanstarted = MNG_TRUE;
609
610 /* adjust output decompression parameters if required */
611 /* nop */
612
613 /* start a new output pass */
614#ifdef MNG_SUPPORT_TRACE
615 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_OUTPUT)
616#endif
617 jpeg_start_output (pData->pJPEGdinfo, pData->pJPEGdinfo->input_scan_number);
618
619 pData->iJPEGrow = 0; /* start at row 0 in the image again */
620 }
621
622 /* while (scan lines remain to be read) */
623 if ((!pData->bJPEGprogressive) || (!pData->bJPEGscanending))
624 {
625 do
626 {
627 /* jpeg_read_scanlines(...); */
628#ifdef MNG_SUPPORT_TRACE
629 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_SCANLINES)
630#endif
631 iLines = jpeg_read_scanlines (pData->pJPEGdinfo, (JSAMPARRAY)&pRow, 1);
632
633 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
634 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
635
636 if (iLines > 0) /* got something ? */
637 {
638 if (pData->fStorerow2) /* store in object ? */
639 {
640 iRetcode = ((mng_storerow)pData->fStorerow2) (pData);
641
642 if (iRetcode) /* on error bail out */
643 return iRetcode;
644
645 }
646 }
647 }
648 while ((pData->pJPEGdinfo->output_scanline < pData->pJPEGdinfo->output_height) &&
649 (iLines > 0)); /* until end-of-image or not enough input-data */
650 }
651
652 /* terminate output pass */
653 if ((pData->bJPEGprogressive) &&
654 (pData->pJPEGdinfo->output_scanline >= pData->pJPEGdinfo->output_height))
655 {
656#ifdef MNG_SUPPORT_TRACE
657 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_OUTPUT)
658#endif
659 if (jpeg_finish_output (pData->pJPEGdinfo) != JPEG_SUSPENDED)
660 { /* this scan has ended */
661 pData->bJPEGscanstarted = MNG_FALSE;
662 pData->bJPEGscanending = MNG_FALSE;
663 }
664 else
665 {
666 pData->bJPEGscanending = MNG_TRUE;
667 }
668 }
669 }
670 while ((!jpeg_input_complete (pData->pJPEGdinfo)) &&
671 (iLines > 0) && (!pData->bJPEGscanending));
672 }
673 /* end of image ? */
674 if ((pData->bJPEGhasheader) && (pData->bJPEGdecostarted) &&
675 (!pData->bJPEGscanending) && (jpeg_input_complete (pData->pJPEGdinfo)) &&
676 (pData->pJPEGdinfo->input_scan_number == pData->pJPEGdinfo->output_scan_number))
677 {
678 /* jpeg_finish_decompress(...); */
679#ifdef MNG_SUPPORT_TRACE
680 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_DECOMPRESS)
681#endif
682 if (jpeg_finish_decompress (pData->pJPEGdinfo) == TRUE)
683 { /* indicate it's done */
684 pData->bJPEGhasheader = MNG_FALSE;
685 pData->bJPEGdecostarted = MNG_FALSE;
686 pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
687 pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
688 /* remaining fluff is an error ! */
689 if ((pData->iJPEGbufremain > 0) || (iRemain > 0))
690 MNG_ERROR (pData, MNG_TOOMUCHJDAT);
691 }
692 }
693#endif /* MNG_INCLUDE_IJG6B */
694 }
695
696#ifdef MNG_SUPPORT_TRACE
697 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_END);
698#endif
699
700 return MNG_NOERROR;
701}
702#endif /* MNG_INCLUDE_JNG_READ */
703
704/* ************************************************************************** */
705
706#ifdef MNG_INCLUDE_JNG_READ
707mng_retcode mngjpeg_decompressfree (mng_datap pData)
708{
709#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
710 mng_retcode iRetcode;
711#endif
712
713#ifdef MNG_SUPPORT_TRACE
714 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_START);
715#endif
716
717#ifdef MNG_INCLUDE_IJG6B
718#ifdef MNG_USE_SETJMP
719 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
720 if (iRetcode != 0) /* got here from longjmp ? */
721 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
722#endif
723 /* free the row of JPEG-samples*/
724 MNG_FREE (pData, pData->pJPEGrow, pData->iJPEGrowlen);
725
726 /* release the JPEG decompression object */
727#ifdef MNG_SUPPORT_TRACE
728 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_JPEG_DESTROY_DECOMPRESS)
729#endif
730 jpeg_destroy_decompress (pData->pJPEGdinfo);
731
732 pData->bJPEGdecompress = MNG_FALSE; /* indicate it's done */
733
734#endif /* MNG_INCLUDE_IJG6B */
735
736#ifdef MNG_SUPPORT_TRACE
737 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_END);
738#endif
739
740 return MNG_NOERROR;
741}
742#endif /* MNG_INCLUDE_JNG_READ */
743
744/* ************************************************************************** */
745/* * * */
746/* * JPEG decompression routines (JDAA) * */
747/* * * */
748/* ************************************************************************** */
749
750#ifdef MNG_INCLUDE_JNG_READ
751mng_retcode mngjpeg_decompressinit2 (mng_datap pData)
752{
753#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
754 mng_retcode iRetcode;
755#endif
756
757#ifdef MNG_SUPPORT_TRACE
758 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_START);
759#endif
760
761#ifdef MNG_INCLUDE_IJG6B
762 /* allocate and initialize a JPEG decompression object */
763 pData->pJPEGdinfo2->err = jpeg_std_error (pData->pJPEGderr2);
764
765#ifdef MNG_USE_SETJMP /* setup local JPEG error-routines */
766 pData->pJPEGderr2->error_exit = mng_error_exit;
767 pData->pJPEGderr2->output_message = mng_output_message;
768
769 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
770 if (iRetcode != 0) /* got here from longjmp ? */
771 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
772#endif /* MNG_USE_SETJMP */
773
774 /* allocate and initialize a JPEG decompression object (continued) */
775#ifdef MNG_SUPPORT_TRACE
776 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_JPEG_CREATE_DECOMPRESS)
777#endif
778 jpeg_create_decompress (pData->pJPEGdinfo2);
779
780 pData->bJPEGdecompress2 = MNG_TRUE; /* indicate it's initialized */
781
782 /* specify the source of the compressed data (eg, a file) */
783 /* no, not a file; we have buffered input */
784 pData->pJPEGdinfo2->src = pData->pJPEGdsrc2;
785 /* use the default handler */
786 pData->pJPEGdinfo2->src->resync_to_restart = jpeg_resync_to_restart;
787 /* setup local source routine & parms */
788 pData->pJPEGdinfo2->src->init_source = mng_init_source;
789 pData->pJPEGdinfo2->src->fill_input_buffer = mng_fill_input_buffer;
790 pData->pJPEGdinfo2->src->skip_input_data = mng_skip_input_data2;
791 pData->pJPEGdinfo2->src->term_source = mng_term_source;
792 pData->pJPEGdinfo2->src->next_input_byte = pData->pJPEGcurrent2;
793 pData->pJPEGdinfo2->src->bytes_in_buffer = pData->iJPEGbufremain2;
794
795#endif /* MNG_INCLUDE_IJG6B */
796
797#ifdef MNG_SUPPORT_TRACE
798 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_END);
799#endif
800
801 return MNG_NOERROR;
802}
803#endif /* MNG_INCLUDE_JNG_READ */
804
805/* ************************************************************************** */
806
807#ifdef MNG_INCLUDE_JNG_READ
808mng_retcode mngjpeg_decompressdata2 (mng_datap pData,
809 mng_uint32 iRawsize,
810 mng_uint8p pRawdata)
811{
812 mng_retcode iRetcode;
813 mng_uint32 iRemain;
814 mng_uint8p pWork;
815
816#ifdef MNG_SUPPORT_TRACE
817 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_START);
818#endif
819
820#if defined (MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
821 iRetcode = setjmp (pData->sErrorbuf);/* initialize local JPEG error-recovery */
822 if (iRetcode != 0) /* got here from longjmp ? */
823 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
824#endif
825
826 pWork = pRawdata;
827 iRemain = iRawsize;
828
829 if (pData->iJPEGtoskip2) /* JPEG-lib told us to skip some more data ? */
830 {
831 if (iRemain > pData->iJPEGtoskip2) /* enough data in this buffer ? */
832 {
833 iRemain -= pData->iJPEGtoskip2; /* skip enough to access the next byte */
834 pWork += pData->iJPEGtoskip2;
835
836 pData->iJPEGtoskip2 = 0; /* no more to skip then */
837 }
838 else
839 {
840 pData->iJPEGtoskip2 -= iRemain; /* skip all data in the buffer */
841 iRemain = 0; /* and indicate this accordingly */
842 }
843 /* the skip set current-pointer to NULL ! */
844 pData->pJPEGcurrent2 = pData->pJPEGbuf2;
845 }
846
847 while (iRemain) /* repeat until no more input-bytes */
848 { /* need to shift anything ? */
849 if ((pData->pJPEGcurrent2 > pData->pJPEGbuf2) &&
850 (pData->pJPEGcurrent2 - pData->pJPEGbuf2 + pData->iJPEGbufremain2 + iRemain > pData->iJPEGbufmax2))
851 {
852 if (pData->iJPEGbufremain2 > 0) /* then do so */
853 MNG_COPY (pData->pJPEGbuf2, pData->pJPEGcurrent2, pData->iJPEGbufremain2);
854
855 pData->pJPEGcurrent2 = pData->pJPEGbuf2;
856 }
857 /* does the remaining input fit into the buffer ? */
858 if (pData->iJPEGbufremain2 + iRemain <= pData->iJPEGbufmax2)
859 { /* move the lot */
860 MNG_COPY ((pData->pJPEGcurrent2 + pData->iJPEGbufremain2), pWork, iRemain);
861 /* adjust remaining_bytes counter */
862 pData->iJPEGbufremain2 += iRemain;
863 iRemain = 0; /* and indicate there's no input left */
864 }
865 else
866 { /* calculate what does fit */
867 mng_uint32 iFits = pData->iJPEGbufmax2 - pData->iJPEGbufremain2;
868
869 if (iFits <= 0) /* no space is just bugger 'm all */
870 MNG_ERROR (pData, MNG_JPEGBUFTOOSMALL);
871 /* move that */
872 MNG_COPY ((pData->pJPEGcurrent2 + pData->iJPEGbufremain2), pWork, iFits);
873
874 pData->iJPEGbufremain2 += iFits; /* adjust remain_bytes counter */
875 iRemain -= iFits; /* and the input-parms */
876 pWork += iFits;
877 }
878
879#ifdef MNG_INCLUDE_IJG6B
880 pData->pJPEGdinfo2->src->next_input_byte = pData->pJPEGcurrent2;
881 pData->pJPEGdinfo2->src->bytes_in_buffer = pData->iJPEGbufremain2;
882
883 if (!pData->bJPEGhasheader2) /* haven't got the header yet ? */
884 {
885 /* call jpeg_read_header() to obtain image info */
886#ifdef MNG_SUPPORT_TRACE
887 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_HEADER)
888#endif
889 if (jpeg_read_header (pData->pJPEGdinfo2, TRUE) != JPEG_SUSPENDED)
890 { /* indicate the header's oke */
891 pData->bJPEGhasheader2 = MNG_TRUE;
892 /* let's do some sanity checks ! */
893 if ((pData->pJPEGdinfo2->image_width != pData->iDatawidth ) ||
894 (pData->pJPEGdinfo2->image_height != pData->iDataheight) )
895 MNG_ERROR (pData, MNG_JPEGPARMSERR);
896
897 if (pData->pJPEGdinfo2->jpeg_color_space != JCS_GRAYSCALE)
898 MNG_ERROR (pData, MNG_JPEGPARMSERR);
899 /* indicate whether or not it's progressive */
900 pData->bJPEGprogressive2 = (mng_bool)jpeg_has_multiple_scans (pData->pJPEGdinfo2);
901
902 if (pData->bJPEGprogressive2) /* progressive alphachannel not allowed !!! */
903 MNG_ERROR (pData, MNG_JPEGPARMSERR);
904 /* allocate a row of JPEG-samples */
905 if (pData->pJPEGdinfo2->jpeg_color_space == JCS_YCbCr)
906 pData->iJPEGrowlen2 = pData->pJPEGdinfo2->image_width * RGB_PIXELSIZE;
907 else
908 pData->iJPEGrowlen2 = pData->pJPEGdinfo2->image_width;
909
910 MNG_ALLOC (pData, pData->pJPEGrow2, pData->iJPEGrowlen2);
911
912 pData->iJPEGalpharow = 0; /* quite empty up to now */
913 }
914
915 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
916 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
917 }
918 /* decompress not started ? */
919 if ((pData->bJPEGhasheader2) && (!pData->bJPEGdecostarted2))
920 {
921 /* set parameters for decompression */
922
923 if (pData->bJPEGprogressive2) /* progressive display ? */
924 pData->pJPEGdinfo2->buffered_image = TRUE;
925
926 /* jpeg_start_decompress(...); */
927#ifdef MNG_SUPPORT_TRACE
928 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_DECOMPRESS)
929#endif
930 if (jpeg_start_decompress (pData->pJPEGdinfo2) == TRUE)
931 /* indicate it started */
932 pData->bJPEGdecostarted2 = MNG_TRUE;
933
934 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
935 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
936 }
937 /* process some scanlines ? */
938 if ((pData->bJPEGhasheader2) && (pData->bJPEGdecostarted2) &&
939 ((!jpeg_input_complete (pData->pJPEGdinfo2)) ||
940 (pData->pJPEGdinfo2->output_scanline < pData->pJPEGdinfo2->output_height)))
941 {
942 mng_int32 iLines;
943
944 /* for (each output pass) */
945 do
946 { /* address the row output buffer */
947 JSAMPROW pRow = (JSAMPROW)pData->pJPEGrow2;
948
949 /* init new pass ? */
950 if ((pData->bJPEGprogressive2) &&
951 ((!pData->bJPEGscanstarted2) ||
952 (pData->pJPEGdinfo2->output_scanline >= pData->pJPEGdinfo2->output_height)))
953 {
954 pData->bJPEGscanstarted2 = MNG_TRUE;
955
956 /* adjust output decompression parameters if required */
957 /* nop */
958
959 /* start a new output pass */
960#ifdef MNG_SUPPORT_TRACE
961 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_OUTPUT)
962#endif
963 jpeg_start_output (pData->pJPEGdinfo2, pData->pJPEGdinfo2->input_scan_number);
964
965 pData->iJPEGrow = 0; /* start at row 0 in the image again */
966 }
967
968 /* while (scan lines remain to be read) */
969 do
970 {
971 /* jpeg_read_scanlines(...); */
972#ifdef MNG_SUPPORT_TRACE
973 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_SCANLINES)
974#endif
975 iLines = jpeg_read_scanlines (pData->pJPEGdinfo2, (JSAMPARRAY)&pRow, 1);
976
977 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
978 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
979
980 if (iLines > 0) /* got something ? */
981 {
982 if (pData->fStorerow3) /* store in object ? */
983 {
984 iRetcode = ((mng_storerow)pData->fStorerow3) (pData);
985
986 if (iRetcode) /* on error bail out */
987 return iRetcode;
988
989 }
990 }
991 }
992 while ((pData->pJPEGdinfo2->output_scanline < pData->pJPEGdinfo2->output_height) &&
993 (iLines > 0)); /* until end-of-image or not enough input-data */
994
995 /* terminate output pass */
996 if ((pData->bJPEGprogressive2) &&
997 (pData->pJPEGdinfo2->output_scanline >= pData->pJPEGdinfo2->output_height))
998 {
999#ifdef MNG_SUPPORT_TRACE
1000 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_OUTPUT)
1001#endif
1002 if (jpeg_finish_output (pData->pJPEGdinfo2) == JPEG_SUSPENDED)
1003 jpeg_finish_output (pData->pJPEGdinfo2);
1004 /* this scan has ended */
1005 pData->bJPEGscanstarted2 = MNG_FALSE;
1006 }
1007 }
1008 while ((!jpeg_input_complete (pData->pJPEGdinfo2)) && (iLines > 0));
1009 }
1010 /* end of image ? */
1011 if ((pData->bJPEGhasheader2) && (pData->bJPEGdecostarted2) &&
1012 (jpeg_input_complete (pData->pJPEGdinfo2)) &&
1013 (pData->pJPEGdinfo2->input_scan_number == pData->pJPEGdinfo2->output_scan_number))
1014 {
1015 /* jpeg_finish_decompress(...); */
1016#ifdef MNG_SUPPORT_TRACE
1017 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_DECOMPRESS)
1018#endif
1019 if (jpeg_finish_decompress (pData->pJPEGdinfo2) == TRUE)
1020 { /* indicate it's done */
1021 pData->bJPEGhasheader2 = MNG_FALSE;
1022 pData->bJPEGdecostarted2 = MNG_FALSE;
1023 pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
1024 pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
1025 /* remaining fluff is an error ! */
1026 if ((pData->iJPEGbufremain2 > 0) || (iRemain > 0))
1027 MNG_ERROR (pData, MNG_TOOMUCHJDAT);
1028 }
1029 }
1030#endif /* MNG_INCLUDE_IJG6B */
1031 }
1032
1033#ifdef MNG_SUPPORT_TRACE
1034 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_END);
1035#endif
1036
1037 return MNG_NOERROR;
1038}
1039#endif /* MNG_INCLUDE_JNG_READ */
1040
1041/* ************************************************************************** */
1042
1043#ifdef MNG_INCLUDE_JNG_READ
1044mng_retcode mngjpeg_decompressfree2 (mng_datap pData)
1045{
1046#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
1047 mng_retcode iRetcode;
1048#endif
1049
1050#ifdef MNG_SUPPORT_TRACE
1051 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_START);
1052#endif
1053
1054#ifdef MNG_INCLUDE_IJG6B
1055#ifdef MNG_USE_SETJMP
1056 iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
1057 if (iRetcode != 0) /* got here from longjmp ? */
1058 MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
1059#endif
1060 /* free the row of JPEG-samples*/
1061 MNG_FREE (pData, pData->pJPEGrow2, pData->iJPEGrowlen2);
1062
1063 /* release the JPEG decompression object */
1064#ifdef MNG_SUPPORT_TRACE
1065 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_JPEG_DESTROY_DECOMPRESS)
1066#endif
1067 jpeg_destroy_decompress (pData->pJPEGdinfo2);
1068
1069 pData->bJPEGdecompress2 = MNG_FALSE; /* indicate it's done */
1070
1071#endif /* MNG_INCLUDE_IJG6B */
1072
1073#ifdef MNG_SUPPORT_TRACE
1074 MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_END);
1075#endif
1076
1077 return MNG_NOERROR;
1078}
1079#endif /* MNG_INCLUDE_JNG_READ */
1080
1081/* ************************************************************************** */
1082
1083#endif /* MNG_INCLUDE_JNG && MNG_INCLUDE_DISPLAY_PROCS */
1084
1085/* ************************************************************************** */
1086/* * end of file * */
1087/* ************************************************************************** */
1088
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