source: rtems-graphics-toolkit/jpeg-8d/jcapimin.c @ 86b99f7

Last change on this file since 86b99f7 was 86b99f7, checked in by Alexandru-Sever Horin <alex.sever.h@…>, on Aug 1, 2012 at 10:40:32 PM

Added jpeg-8d version. Made modifications to compile for RTEMS, without man or binaries

  • Property mode set to 100644
File size: 9.2 KB
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1/*
2 * jcapimin.c
3 *
4 * Copyright (C) 1994-1998, Thomas G. Lane.
5 * Modified 2003-2010 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file contains application interface code for the compression half
10 * of the JPEG library.  These are the "minimum" API routines that may be
11 * needed in either the normal full-compression case or the transcoding-only
12 * case.
13 *
14 * Most of the routines intended to be called directly by an application
15 * are in this file or in jcapistd.c.  But also see jcparam.c for
16 * parameter-setup helper routines, jcomapi.c for routines shared by
17 * compression and decompression, and jctrans.c for the transcoding case.
18 */
19
20#define JPEG_INTERNALS
21#include "jinclude.h"
22#include "jpeglib.h"
23
24
25/*
26 * Initialization of a JPEG compression object.
27 * The error manager must already be set up (in case memory manager fails).
28 */
29
30GLOBAL(void)
31jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
32{
33  int i;
34
35  /* Guard against version mismatches between library and caller. */
36  cinfo->mem = NULL;            /* so jpeg_destroy knows mem mgr not called */
37  if (version != JPEG_LIB_VERSION)
38    ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
39  if (structsize != SIZEOF(struct jpeg_compress_struct))
40    ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
41             (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
42
43  /* For debugging purposes, we zero the whole master structure.
44   * But the application has already set the err pointer, and may have set
45   * client_data, so we have to save and restore those fields.
46   * Note: if application hasn't set client_data, tools like Purify may
47   * complain here.
48   */
49  {
50    struct jpeg_error_mgr * err = cinfo->err;
51    void * client_data = cinfo->client_data; /* ignore Purify complaint here */
52    MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
53    cinfo->err = err;
54    cinfo->client_data = client_data;
55  }
56  cinfo->is_decompressor = FALSE;
57
58  /* Initialize a memory manager instance for this object */
59  jinit_memory_mgr((j_common_ptr) cinfo);
60
61  /* Zero out pointers to permanent structures. */
62  cinfo->progress = NULL;
63  cinfo->dest = NULL;
64
65  cinfo->comp_info = NULL;
66
67  for (i = 0; i < NUM_QUANT_TBLS; i++) {
68    cinfo->quant_tbl_ptrs[i] = NULL;
69    cinfo->q_scale_factor[i] = 100;
70  }
71
72  for (i = 0; i < NUM_HUFF_TBLS; i++) {
73    cinfo->dc_huff_tbl_ptrs[i] = NULL;
74    cinfo->ac_huff_tbl_ptrs[i] = NULL;
75  }
76
77  /* Must do it here for emit_dqt in case jpeg_write_tables is used */
78  cinfo->block_size = DCTSIZE;
79  cinfo->natural_order = jpeg_natural_order;
80  cinfo->lim_Se = DCTSIZE2-1;
81
82  cinfo->script_space = NULL;
83
84  cinfo->input_gamma = 1.0;     /* in case application forgets */
85
86  /* OK, I'm ready */
87  cinfo->global_state = CSTATE_START;
88}
89
90
91/*
92 * Destruction of a JPEG compression object
93 */
94
95GLOBAL(void)
96jpeg_destroy_compress (j_compress_ptr cinfo)
97{
98  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
99}
100
101
102/*
103 * Abort processing of a JPEG compression operation,
104 * but don't destroy the object itself.
105 */
106
107GLOBAL(void)
108jpeg_abort_compress (j_compress_ptr cinfo)
109{
110  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
111}
112
113
114/*
115 * Forcibly suppress or un-suppress all quantization and Huffman tables.
116 * Marks all currently defined tables as already written (if suppress)
117 * or not written (if !suppress).  This will control whether they get emitted
118 * by a subsequent jpeg_start_compress call.
119 *
120 * This routine is exported for use by applications that want to produce
121 * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
122 * since it is called by jpeg_start_compress, we put it here --- otherwise
123 * jcparam.o would be linked whether the application used it or not.
124 */
125
126GLOBAL(void)
127jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
128{
129  int i;
130  JQUANT_TBL * qtbl;
131  JHUFF_TBL * htbl;
132
133  for (i = 0; i < NUM_QUANT_TBLS; i++) {
134    if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
135      qtbl->sent_table = suppress;
136  }
137
138  for (i = 0; i < NUM_HUFF_TBLS; i++) {
139    if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
140      htbl->sent_table = suppress;
141    if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
142      htbl->sent_table = suppress;
143  }
144}
145
146
147/*
148 * Finish JPEG compression.
149 *
150 * If a multipass operating mode was selected, this may do a great deal of
151 * work including most of the actual output.
152 */
153
154GLOBAL(void)
155jpeg_finish_compress (j_compress_ptr cinfo)
156{
157  JDIMENSION iMCU_row;
158
159  if (cinfo->global_state == CSTATE_SCANNING ||
160      cinfo->global_state == CSTATE_RAW_OK) {
161    /* Terminate first pass */
162    if (cinfo->next_scanline < cinfo->image_height)
163      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
164    (*cinfo->master->finish_pass) (cinfo);
165  } else if (cinfo->global_state != CSTATE_WRCOEFS)
166    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
167  /* Perform any remaining passes */
168  while (! cinfo->master->is_last_pass) {
169    (*cinfo->master->prepare_for_pass) (cinfo);
170    for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
171      if (cinfo->progress != NULL) {
172        cinfo->progress->pass_counter = (long) iMCU_row;
173        cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
174        (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
175      }
176      /* We bypass the main controller and invoke coef controller directly;
177       * all work is being done from the coefficient buffer.
178       */
179      if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
180        ERREXIT(cinfo, JERR_CANT_SUSPEND);
181    }
182    (*cinfo->master->finish_pass) (cinfo);
183  }
184  /* Write EOI, do final cleanup */
185  (*cinfo->marker->write_file_trailer) (cinfo);
186  (*cinfo->dest->term_destination) (cinfo);
187  /* We can use jpeg_abort to release memory and reset global_state */
188  jpeg_abort((j_common_ptr) cinfo);
189}
190
191
192/*
193 * Write a special marker.
194 * This is only recommended for writing COM or APPn markers.
195 * Must be called after jpeg_start_compress() and before
196 * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
197 */
198
199GLOBAL(void)
200jpeg_write_marker (j_compress_ptr cinfo, int marker,
201                   const JOCTET *dataptr, unsigned int datalen)
202{
203  JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
204
205  if (cinfo->next_scanline != 0 ||
206      (cinfo->global_state != CSTATE_SCANNING &&
207       cinfo->global_state != CSTATE_RAW_OK &&
208       cinfo->global_state != CSTATE_WRCOEFS))
209    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
210
211  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
212  write_marker_byte = cinfo->marker->write_marker_byte; /* copy for speed */
213  while (datalen--) {
214    (*write_marker_byte) (cinfo, *dataptr);
215    dataptr++;
216  }
217}
218
219/* Same, but piecemeal. */
220
221GLOBAL(void)
222jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
223{
224  if (cinfo->next_scanline != 0 ||
225      (cinfo->global_state != CSTATE_SCANNING &&
226       cinfo->global_state != CSTATE_RAW_OK &&
227       cinfo->global_state != CSTATE_WRCOEFS))
228    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
229
230  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
231}
232
233GLOBAL(void)
234jpeg_write_m_byte (j_compress_ptr cinfo, int val)
235{
236  (*cinfo->marker->write_marker_byte) (cinfo, val);
237}
238
239
240/*
241 * Alternate compression function: just write an abbreviated table file.
242 * Before calling this, all parameters and a data destination must be set up.
243 *
244 * To produce a pair of files containing abbreviated tables and abbreviated
245 * image data, one would proceed as follows:
246 *
247 *              initialize JPEG object
248 *              set JPEG parameters
249 *              set destination to table file
250 *              jpeg_write_tables(cinfo);
251 *              set destination to image file
252 *              jpeg_start_compress(cinfo, FALSE);
253 *              write data...
254 *              jpeg_finish_compress(cinfo);
255 *
256 * jpeg_write_tables has the side effect of marking all tables written
257 * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
258 * will not re-emit the tables unless it is passed write_all_tables=TRUE.
259 */
260
261GLOBAL(void)
262jpeg_write_tables (j_compress_ptr cinfo)
263{
264  if (cinfo->global_state != CSTATE_START)
265    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
266
267  /* (Re)initialize error mgr and destination modules */
268  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
269  (*cinfo->dest->init_destination) (cinfo);
270  /* Initialize the marker writer ... bit of a crock to do it here. */
271  jinit_marker_writer(cinfo);
272  /* Write them tables! */
273  (*cinfo->marker->write_tables_only) (cinfo);
274  /* And clean up. */
275  (*cinfo->dest->term_destination) (cinfo);
276  /*
277   * In library releases up through v6a, we called jpeg_abort() here to free
278   * any working memory allocated by the destination manager and marker
279   * writer.  Some applications had a problem with that: they allocated space
280   * of their own from the library memory manager, and didn't want it to go
281   * away during write_tables.  So now we do nothing.  This will cause a
282   * memory leak if an app calls write_tables repeatedly without doing a full
283   * compression cycle or otherwise resetting the JPEG object.  However, that
284   * seems less bad than unexpectedly freeing memory in the normal case.
285   * An app that prefers the old behavior can call jpeg_abort for itself after
286   * each call to jpeg_write_tables().
287   */
288}
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