jcapimin.c
Go to the documentation of this file.
1 /*
2  * jcapimin.c
3  *
4  * Copyright (C) 1994-1998, Thomas G. Lane.
5  * This file is part of the Independent JPEG Group's software.
6  * For conditions of distribution and use, see the accompanying README file.
7  *
8  * This file contains application interface code for the compression half
9  * of the JPEG library. These are the "minimum" API routines that may be
10  * needed in either the normal full-compression case or the transcoding-only
11  * case.
12  *
13  * Most of the routines intended to be called directly by an application
14  * are in this file or in jcapistd.c. But also see jcparam.c for
15  * parameter-setup helper routines, jcomapi.c for routines shared by
16  * compression and decompression, and jctrans.c for the transcoding case.
17  */
18 
19 #define JPEG_INTERNALS
20 #include "jinclude.h"
21 #include "jpeglib.h"
22 
23 
24 /*
25  * Initialization of a JPEG compression object.
26  * The error manager must already be set up (in case memory manager fails).
27  */
28 
29 GLOBAL(void)
31 {
32  int i;
33 
34  /* Guard against version mismatches between library and caller. */
35  cinfo->mem = NULL; /* so jpeg_destroy knows mem mgr not called */
37  ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
38  if (structsize != SIZEOF(struct jpeg_compress_struct))
39  ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE,
40  (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
41 
42  /* For debugging purposes, we zero the whole master structure.
43  * But the application has already set the err pointer, and may have set
44  * client_data, so we have to save and restore those fields.
45  * Note: if application hasn't set client_data, tools like Purify may
46  * complain here.
47  */
48  {
49  struct jpeg_error_mgr * err = cinfo->err;
50  void * client_data = cinfo->client_data; /* ignore Purify complaint here */
51  MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
52  cinfo->err = err;
53  cinfo->client_data = client_data;
54  }
55  cinfo->is_decompressor = FALSE;
56 
57  /* Initialize a memory manager instance for this object */
59 
60  /* Zero out pointers to permanent structures. */
61  cinfo->progress = NULL;
62  cinfo->dest = NULL;
63 
64  cinfo->comp_info = NULL;
65 
66  for (i = 0; i < NUM_QUANT_TBLS; i++)
67  cinfo->quant_tbl_ptrs[i] = NULL;
68 
69  for (i = 0; i < NUM_HUFF_TBLS; i++) {
70  cinfo->dc_huff_tbl_ptrs[i] = NULL;
71  cinfo->ac_huff_tbl_ptrs[i] = NULL;
72  }
73 
74  cinfo->script_space = NULL;
75 
76  cinfo->input_gamma = 1.0; /* in case application forgets */
77 
78  /* OK, I'm ready */
79  cinfo->global_state = CSTATE_START;
80 }
81 
82 
83 /*
84  * Destruction of a JPEG compression object
85  */
86 
87 GLOBAL(void)
89 {
90  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
91 }
92 
93 
94 /*
95  * Abort processing of a JPEG compression operation,
96  * but don't destroy the object itself.
97  */
98 
99 GLOBAL(void)
101 {
102  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
103 }
104 
105 
106 /*
107  * Forcibly suppress or un-suppress all quantization and Huffman tables.
108  * Marks all currently defined tables as already written (if suppress)
109  * or not written (if !suppress). This will control whether they get emitted
110  * by a subsequent jpeg_start_compress call.
111  *
112  * This routine is exported for use by applications that want to produce
113  * abbreviated JPEG datastreams. It logically belongs in jcparam.c, but
114  * since it is called by jpeg_start_compress, we put it here --- otherwise
115  * jcparam.o would be linked whether the application used it or not.
116  */
117 
118 GLOBAL(void)
120 {
121  int i;
122  JQUANT_TBL * qtbl;
123  JHUFF_TBL * htbl;
124 
125  for (i = 0; i < NUM_QUANT_TBLS; i++) {
126  if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
127  qtbl->sent_table = suppress;
128  }
129 
130  for (i = 0; i < NUM_HUFF_TBLS; i++) {
131  if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
133  if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
135  }
136 }
137 
138 
139 /*
140  * Finish JPEG compression.
141  *
142  * If a multipass operating mode was selected, this may do a great deal of
143  * work including most of the actual output.
144  */
145 
146 GLOBAL(void)
148 {
149  JDIMENSION iMCU_row;
150 
151  if (cinfo->global_state == CSTATE_SCANNING ||
152  cinfo->global_state == CSTATE_RAW_OK) {
153  /* Terminate first pass */
154  if (cinfo->next_scanline < cinfo->image_height)
155  ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
156  (*cinfo->master->finish_pass) (cinfo);
157  } else if (cinfo->global_state != CSTATE_WRCOEFS)
158  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
159  /* Perform any remaining passes */
160  while (! cinfo->master->is_last_pass) {
161  (*cinfo->master->prepare_for_pass) (cinfo);
162  for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
163  if (cinfo->progress != NULL) {
164  cinfo->progress->pass_counter = (long) iMCU_row;
165  cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
166  (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
167  }
168  /* We bypass the main controller and invoke coef controller directly;
169  * all work is being done from the coefficient buffer.
170  */
171  if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
172  ERREXIT(cinfo, JERR_CANT_SUSPEND);
173  }
174  (*cinfo->master->finish_pass) (cinfo);
175  }
176  /* Write EOI, do final cleanup */
177  (*cinfo->marker->write_file_trailer) (cinfo);
178  (*cinfo->dest->term_destination) (cinfo);
179  /* We can use jpeg_abort to release memory and reset global_state */
180  jpeg_abort((j_common_ptr) cinfo);
181 }
182 
183 
184 /*
185  * Write a special marker.
186  * This is only recommended for writing COM or APPn markers.
187  * Must be called after jpeg_start_compress() and before
188  * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
189  */
190 
191 GLOBAL(void)
193  const JOCTET *dataptr, unsigned int datalen)
194 {
196 
197  if (cinfo->next_scanline != 0 ||
198  (cinfo->global_state != CSTATE_SCANNING &&
199  cinfo->global_state != CSTATE_RAW_OK &&
200  cinfo->global_state != CSTATE_WRCOEFS))
201  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
202 
203  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
204  write_marker_byte = cinfo->marker->write_marker_byte; /* copy for speed */
205  while (datalen--) {
206  (*write_marker_byte) (cinfo, *dataptr);
207  dataptr++;
208  }
209 }
210 
211 /* Same, but piecemeal. */
212 
213 GLOBAL(void)
215 {
216  if (cinfo->next_scanline != 0 ||
217  (cinfo->global_state != CSTATE_SCANNING &&
218  cinfo->global_state != CSTATE_RAW_OK &&
219  cinfo->global_state != CSTATE_WRCOEFS))
220  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
221 
222  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
223 }
224 
225 GLOBAL(void)
227 {
228  (*cinfo->marker->write_marker_byte) (cinfo, val);
229 }
230 
231 
232 /*
233  * Alternate compression function: just write an abbreviated table file.
234  * Before calling this, all parameters and a data destination must be set up.
235  *
236  * To produce a pair of files containing abbreviated tables and abbreviated
237  * image data, one would proceed as follows:
238  *
239  * initialize JPEG object
240  * set JPEG parameters
241  * set destination to table file
242  * jpeg_write_tables(cinfo);
243  * set destination to image file
244  * jpeg_start_compress(cinfo, FALSE);
245  * write data...
246  * jpeg_finish_compress(cinfo);
247  *
248  * jpeg_write_tables has the side effect of marking all tables written
249  * (same as jpeg_suppress_tables(..., TRUE)). Thus a subsequent start_compress
250  * will not re-emit the tables unless it is passed write_all_tables=TRUE.
251  */
252 
253 GLOBAL(void)
255 {
256  if (cinfo->global_state != CSTATE_START)
257  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
258 
259  /* (Re)initialize error mgr and destination modules */
260  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
261  (*cinfo->dest->init_destination) (cinfo);
262  /* Initialize the marker writer ... bit of a crock to do it here. */
263  jinit_marker_writer(cinfo);
264  /* Write them tables! */
265  (*cinfo->marker->write_tables_only) (cinfo);
266  /* And clean up. */
267  (*cinfo->dest->term_destination) (cinfo);
268  /*
269  * In library releases up through v6a, we called jpeg_abort() here to free
270  * any working memory allocated by the destination manager and marker
271  * writer. Some applications had a problem with that: they allocated space
272  * of their own from the library memory manager, and didn't want it to go
273  * away during write_tables. So now we do nothing. This will cause a
274  * memory leak if an app calls write_tables repeatedly without doing a full
275  * compression cycle or otherwise resetting the JPEG object. However, that
276  * seems less bad than unexpectedly freeing memory in the normal case.
277  * An app that prefers the old behavior can call jpeg_abort for itself after
278  * each call to jpeg_write_tables().
279  */
280 }
jpeg_destroy
jpeg_destroy(j_common_ptr cinfo)
Definition: jcomapi.c:69
dataptr
int const JOCTET * dataptr
Definition: jpeglib.h:951
NUM_HUFF_TBLS
#define NUM_HUFF_TBLS
Definition: jpeglib.h:44
i
png_uint_32 i
Definition: png.h:2732
jpeglib.h
jpeg_CreateCompress
jpeg_CreateCompress(j_compress_ptr cinfo, int version, size_t structsize)
Definition: jcapimin.c:30
NUM_QUANT_TBLS
#define NUM_QUANT_TBLS
Definition: jpeglib.h:43
j_common_ptr
struct jpeg_common_struct * j_common_ptr
Definition: jpeglib.h:261
JHUFF_TBL
Definition: jpeglib.h:100
version
int version
Definition: jpeglib.h:901
jpeg_finish_compress
jpeg_finish_compress(j_compress_ptr cinfo)
Definition: jcapimin.c:147
suppress
boolean suppress
Definition: jpeglib.h:931
jinclude.h
jpeg_error_mgr
Definition: jpeglib.h:643
for
#define for
Definition: IcePreprocessor.h:129
JPEG_LIB_VERSION
#define JPEG_LIB_VERSION
Definition: jpeglib.h:33
CSTATE_SCANNING
#define CSTATE_SCANNING
Definition: jpegint.h:26
ERREXIT1
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:208
datalen
int const JOCTET unsigned int datalen
Definition: jpeglib.h:951
GLOBAL
#define GLOBAL(type)
Definition: jmorecfg.h:188
jpeg_suppress_tables
jpeg_suppress_tables(j_compress_ptr cinfo, boolean suppress)
Definition: jcapimin.c:119
CSTATE_RAW_OK
#define CSTATE_RAW_OK
Definition: jpegint.h:27
jinit_memory_mgr
jinit_memory_mgr(j_common_ptr cinfo)
Definition: jmemmgr.c:1028
ERREXIT
#define ERREXIT(cinfo, code)
Definition: jerror.h:205
JOCTET
char JOCTET
Definition: jmorecfg.h:115
jpeg_abort
jpeg_abort(j_common_ptr cinfo)
Definition: jcomapi.c:29
jpeg_write_marker
jpeg_write_marker(j_compress_ptr cinfo, int marker, const JOCTET *dataptr, unsigned int datalen)
Definition: jcapimin.c:192
jpeg_common_struct
Definition: jpeglib.h:253
JHUFF_TBL::sent_table
boolean sent_table
Definition: jpeglib.h:110
jpeg_compress_struct
Definition: jpeglib.h:268
JDIMENSION
unsigned int JDIMENSION
Definition: jmorecfg.h:171
marker
int marker
Definition: jpeglib.h:950
htbl
JHUFF_TBL * htbl
Definition: jchuff.h:47
SIZEOF
#define SIZEOF(object)
Definition: jinclude.h:80
MEMZERO
#define MEMZERO(target, size)
Definition: jinclude.h:67
JQUANT_TBL::sent_table
boolean sent_table
Definition: jpeglib.h:94
structsize
int size_t structsize
Definition: jpeglib.h:901
JSAMPIMAGE
JSAMPARRAY * JSAMPIMAGE
Definition: jpeglib.h:68
write_marker_byte
write_marker_byte(j_compress_ptr cinfo, int val)
Definition: jcmarker.c:450
jpeg_write_m_byte
jpeg_write_m_byte(j_compress_ptr cinfo, int val)
Definition: jcapimin.c:226
CSTATE_START
#define CSTATE_START
Definition: jpegint.h:25
ERREXIT2
#define ERREXIT2(cinfo, code, p1, p2)
Definition: jerror.h:212
val
int val
Definition: jpeglib.h:956
FALSE
#define FALSE
Definition: OPC_IceHook.h:9
JMETHOD
#define JMETHOD(type, methodname, arglist)
Definition: jmorecfg.h:202
info
backing_store_ptr info
Definition: jmemsys.h:181
jpeg_abort_compress
jpeg_abort_compress(j_compress_ptr cinfo)
Definition: jcapimin.c:100
CSTATE_WRCOEFS
#define CSTATE_WRCOEFS
Definition: jpegint.h:28
JQUANT_TBL
Definition: jpeglib.h:83
jpeg_destroy_compress
jpeg_destroy_compress(j_compress_ptr cinfo)
Definition: jcapimin.c:88
jinit_marker_writer
jinit_marker_writer(j_compress_ptr cinfo)
Definition: jcmarker.c:645
jpeg_write_tables
jpeg_write_tables(j_compress_ptr cinfo)
Definition: jcapimin.c:254
jpeg_write_m_header
jpeg_write_m_header(j_compress_ptr cinfo, int marker, unsigned int datalen)
Definition: jcapimin.c:214
const
#define const
Definition: zconf.h:124


openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Wed Sep 7 2022 02:51:03