1#if !defined(_FX_JPEG_TURBO_)
2/*
3 * jcapimin.c
4 *
5 * Copyright (C) 1994-1998, Thomas G. Lane.
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
70  for (i = 0; i < NUM_HUFF_TBLS; i++) {
71    cinfo->dc_huff_tbl_ptrs[i] = NULL;
72    cinfo->ac_huff_tbl_ptrs[i] = NULL;
73  }
74
75  cinfo->script_space = NULL;
76
77  cinfo->input_gamma = 1.0;	/* in case application forgets */
78
79  /* OK, I'm ready */
80  cinfo->global_state = CSTATE_START;
81}
82
83
84/*
85 * Destruction of a JPEG compression object
86 */
87
88GLOBAL(void)
89jpeg_destroy_compress (j_compress_ptr cinfo)
90{
91  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
92}
93
94
95/*
96 * Abort processing of a JPEG compression operation,
97 * but don't destroy the object itself.
98 */
99
100GLOBAL(void)
101jpeg_abort_compress (j_compress_ptr cinfo)
102{
103  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
104}
105
106
107/*
108 * Forcibly suppress or un-suppress all quantization and Huffman tables.
109 * Marks all currently defined tables as already written (if suppress)
110 * or not written (if !suppress).  This will control whether they get emitted
111 * by a subsequent jpeg_start_compress call.
112 *
113 * This routine is exported for use by applications that want to produce
114 * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
115 * since it is called by jpeg_start_compress, we put it here --- otherwise
116 * jcparam.o would be linked whether the application used it or not.
117 */
118
119GLOBAL(void)
120jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
121{
122  int i;
123  JQUANT_TBL * qtbl;
124  JHUFF_TBL * htbl;
125
126  for (i = 0; i < NUM_QUANT_TBLS; i++) {
127    if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
128      qtbl->sent_table = suppress;
129  }
130
131  for (i = 0; i < NUM_HUFF_TBLS; i++) {
132    if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
133      htbl->sent_table = suppress;
134    if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
135      htbl->sent_table = suppress;
136  }
137}
138
139
140/*
141 * Finish JPEG compression.
142 *
143 * If a multipass operating mode was selected, this may do a great deal of
144 * work including most of the actual output.
145 */
146
147GLOBAL(void)
148jpeg_finish_compress (j_compress_ptr cinfo)
149{
150  JDIMENSION iMCU_row;
151
152  if (cinfo->global_state == CSTATE_SCANNING ||
153      cinfo->global_state == CSTATE_RAW_OK) {
154    /* Terminate first pass */
155    if (cinfo->next_scanline < cinfo->image_height)
156      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
157    (*cinfo->master->finish_pass) (cinfo);
158  } else if (cinfo->global_state != CSTATE_WRCOEFS)
159    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
160  /* Perform any remaining passes */
161  while (! cinfo->master->is_last_pass) {
162    (*cinfo->master->prepare_for_pass) (cinfo);
163    for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
164      if (cinfo->progress != NULL) {
165	cinfo->progress->pass_counter = (long) iMCU_row;
166	cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
167	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
168      }
169      /* We bypass the main controller and invoke coef controller directly;
170       * all work is being done from the coefficient buffer.
171       */
172      if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
173	ERREXIT(cinfo, JERR_CANT_SUSPEND);
174    }
175    (*cinfo->master->finish_pass) (cinfo);
176  }
177  /* Write EOI, do final cleanup */
178  (*cinfo->marker->write_file_trailer) (cinfo);
179  (*cinfo->dest->term_destination) (cinfo);
180  /* We can use jpeg_abort to release memory and reset global_state */
181  jpeg_abort((j_common_ptr) cinfo);
182}
183
184
185/*
186 * Write a special marker.
187 * This is only recommended for writing COM or APPn markers.
188 * Must be called after jpeg_start_compress() and before
189 * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
190 */
191
192GLOBAL(void)
193jpeg_write_marker (j_compress_ptr cinfo, int marker,
194		   const JOCTET *dataptr, unsigned int datalen)
195{
196  JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
197
198  if (cinfo->next_scanline != 0 ||
199      (cinfo->global_state != CSTATE_SCANNING &&
200       cinfo->global_state != CSTATE_RAW_OK &&
201       cinfo->global_state != CSTATE_WRCOEFS))
202    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
203
204  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
205  write_marker_byte = cinfo->marker->write_marker_byte;	/* copy for speed */
206  while (datalen--) {
207    (*write_marker_byte) (cinfo, *dataptr);
208    dataptr++;
209  }
210}
211
212/* Same, but piecemeal. */
213
214GLOBAL(void)
215jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
216{
217  if (cinfo->next_scanline != 0 ||
218      (cinfo->global_state != CSTATE_SCANNING &&
219       cinfo->global_state != CSTATE_RAW_OK &&
220       cinfo->global_state != CSTATE_WRCOEFS))
221    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
222
223  (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
224}
225
226GLOBAL(void)
227jpeg_write_m_byte (j_compress_ptr cinfo, int val)
228{
229  (*cinfo->marker->write_marker_byte) (cinfo, val);
230}
231
232
233/*
234 * Alternate compression function: just write an abbreviated table file.
235 * Before calling this, all parameters and a data destination must be set up.
236 *
237 * To produce a pair of files containing abbreviated tables and abbreviated
238 * image data, one would proceed as follows:
239 *
240 *		initialize JPEG object
241 *		set JPEG parameters
242 *		set destination to table file
243 *		jpeg_write_tables(cinfo);
244 *		set destination to image file
245 *		jpeg_start_compress(cinfo, FALSE);
246 *		write data...
247 *		jpeg_finish_compress(cinfo);
248 *
249 * jpeg_write_tables has the side effect of marking all tables written
250 * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
251 * will not re-emit the tables unless it is passed write_all_tables=TRUE.
252 */
253
254GLOBAL(void)
255jpeg_write_tables (j_compress_ptr cinfo)
256{
257  if (cinfo->global_state != CSTATE_START)
258    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
259
260  /* (Re)initialize error mgr and destination modules */
261  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
262  (*cinfo->dest->init_destination) (cinfo);
263  /* Initialize the marker writer ... bit of a crock to do it here. */
264  jinit_marker_writer(cinfo);
265  /* Write them tables! */
266  (*cinfo->marker->write_tables_only) (cinfo);
267  /* And clean up. */
268  (*cinfo->dest->term_destination) (cinfo);
269  /*
270   * In library releases up through v6a, we called jpeg_abort() here to free
271   * any working memory allocated by the destination manager and marker
272   * writer.  Some applications had a problem with that: they allocated space
273   * of their own from the library memory manager, and didn't want it to go
274   * away during write_tables.  So now we do nothing.  This will cause a
275   * memory leak if an app calls write_tables repeatedly without doing a full
276   * compression cycle or otherwise resetting the JPEG object.  However, that
277   * seems less bad than unexpectedly freeing memory in the normal case.
278   * An app that prefers the old behavior can call jpeg_abort for itself after
279   * each call to jpeg_write_tables().
280   */
281}
282
283#endif //_FX_JPEG_TURBO_
284