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
30 GLOBAL(void)
jpeg_CreateCompress(j_compress_ptr cinfo,int version,size_t structsize)31 jpeg_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
88 GLOBAL(void)
jpeg_destroy_compress(j_compress_ptr cinfo)89 jpeg_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
100 GLOBAL(void)
jpeg_abort_compress(j_compress_ptr cinfo)101 jpeg_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
119 GLOBAL(void)
jpeg_suppress_tables(j_compress_ptr cinfo,boolean suppress)120 jpeg_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
147 GLOBAL(void)
jpeg_finish_compress(j_compress_ptr cinfo)148 jpeg_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
192 GLOBAL(void)
jpeg_write_marker(j_compress_ptr cinfo,int marker,const JOCTET * dataptr,unsigned int datalen)193 jpeg_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
214 GLOBAL(void)
jpeg_write_m_header(j_compress_ptr cinfo,int marker,unsigned int datalen)215 jpeg_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
226 GLOBAL(void)
jpeg_write_m_byte(j_compress_ptr cinfo,int val)227 jpeg_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
254 GLOBAL(void)
jpeg_write_tables(j_compress_ptr cinfo)255 jpeg_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