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annotate libs/libjpeg/jcapimin.c @ 0:b2f14e535253

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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nuclear@0 1 /*
nuclear@0 2 * jcapimin.c
nuclear@0 3 *
nuclear@0 4 * Copyright (C) 1994-1998, Thomas G. Lane.
nuclear@0 5 * This file is part of the Independent JPEG Group's software.
nuclear@0 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@0 7 *
nuclear@0 8 * This file contains application interface code for the compression half
nuclear@0 9 * of the JPEG library. These are the "minimum" API routines that may be
nuclear@0 10 * needed in either the normal full-compression case or the transcoding-only
nuclear@0 11 * case.
nuclear@0 12 *
nuclear@0 13 * Most of the routines intended to be called directly by an application
nuclear@0 14 * are in this file or in jcapistd.c. But also see jcparam.c for
nuclear@0 15 * parameter-setup helper routines, jcomapi.c for routines shared by
nuclear@0 16 * compression and decompression, and jctrans.c for the transcoding case.
nuclear@0 17 */
nuclear@0 18
nuclear@0 19 #define JPEG_INTERNALS
nuclear@0 20 #include "jinclude.h"
nuclear@0 21 #include "jpeglib.h"
nuclear@0 22
nuclear@0 23
nuclear@0 24 /*
nuclear@0 25 * Initialization of a JPEG compression object.
nuclear@0 26 * The error manager must already be set up (in case memory manager fails).
nuclear@0 27 */
nuclear@0 28
nuclear@0 29 GLOBAL(void)
nuclear@0 30 jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
nuclear@0 31 {
nuclear@0 32 int i;
nuclear@0 33
nuclear@0 34 /* Guard against version mismatches between library and caller. */
nuclear@0 35 cinfo->mem = NULL; /* so jpeg_destroy knows mem mgr not called */
nuclear@0 36 if (version != JPEG_LIB_VERSION)
nuclear@0 37 ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
nuclear@0 38 if (structsize != SIZEOF(struct jpeg_compress_struct))
nuclear@0 39 ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE,
nuclear@0 40 (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
nuclear@0 41
nuclear@0 42 /* For debugging purposes, we zero the whole master structure.
nuclear@0 43 * But the application has already set the err pointer, and may have set
nuclear@0 44 * client_data, so we have to save and restore those fields.
nuclear@0 45 * Note: if application hasn't set client_data, tools like Purify may
nuclear@0 46 * complain here.
nuclear@0 47 */
nuclear@0 48 {
nuclear@0 49 struct jpeg_error_mgr * err = cinfo->err;
nuclear@0 50 void * client_data = cinfo->client_data; /* ignore Purify complaint here */
nuclear@0 51 MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
nuclear@0 52 cinfo->err = err;
nuclear@0 53 cinfo->client_data = client_data;
nuclear@0 54 }
nuclear@0 55 cinfo->is_decompressor = FALSE;
nuclear@0 56
nuclear@0 57 /* Initialize a memory manager instance for this object */
nuclear@0 58 jinit_memory_mgr((j_common_ptr) cinfo);
nuclear@0 59
nuclear@0 60 /* Zero out pointers to permanent structures. */
nuclear@0 61 cinfo->progress = NULL;
nuclear@0 62 cinfo->dest = NULL;
nuclear@0 63
nuclear@0 64 cinfo->comp_info = NULL;
nuclear@0 65
nuclear@0 66 for (i = 0; i < NUM_QUANT_TBLS; i++)
nuclear@0 67 cinfo->quant_tbl_ptrs[i] = NULL;
nuclear@0 68
nuclear@0 69 for (i = 0; i < NUM_HUFF_TBLS; i++) {
nuclear@0 70 cinfo->dc_huff_tbl_ptrs[i] = NULL;
nuclear@0 71 cinfo->ac_huff_tbl_ptrs[i] = NULL;
nuclear@0 72 }
nuclear@0 73
nuclear@0 74 cinfo->script_space = NULL;
nuclear@0 75
nuclear@0 76 cinfo->input_gamma = 1.0; /* in case application forgets */
nuclear@0 77
nuclear@0 78 /* OK, I'm ready */
nuclear@0 79 cinfo->global_state = CSTATE_START;
nuclear@0 80 }
nuclear@0 81
nuclear@0 82
nuclear@0 83 /*
nuclear@0 84 * Destruction of a JPEG compression object
nuclear@0 85 */
nuclear@0 86
nuclear@0 87 GLOBAL(void)
nuclear@0 88 jpeg_destroy_compress (j_compress_ptr cinfo)
nuclear@0 89 {
nuclear@0 90 jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
nuclear@0 91 }
nuclear@0 92
nuclear@0 93
nuclear@0 94 /*
nuclear@0 95 * Abort processing of a JPEG compression operation,
nuclear@0 96 * but don't destroy the object itself.
nuclear@0 97 */
nuclear@0 98
nuclear@0 99 GLOBAL(void)
nuclear@0 100 jpeg_abort_compress (j_compress_ptr cinfo)
nuclear@0 101 {
nuclear@0 102 jpeg_abort((j_common_ptr) cinfo); /* use common routine */
nuclear@0 103 }
nuclear@0 104
nuclear@0 105
nuclear@0 106 /*
nuclear@0 107 * Forcibly suppress or un-suppress all quantization and Huffman tables.
nuclear@0 108 * Marks all currently defined tables as already written (if suppress)
nuclear@0 109 * or not written (if !suppress). This will control whether they get emitted
nuclear@0 110 * by a subsequent jpeg_start_compress call.
nuclear@0 111 *
nuclear@0 112 * This routine is exported for use by applications that want to produce
nuclear@0 113 * abbreviated JPEG datastreams. It logically belongs in jcparam.c, but
nuclear@0 114 * since it is called by jpeg_start_compress, we put it here --- otherwise
nuclear@0 115 * jcparam.o would be linked whether the application used it or not.
nuclear@0 116 */
nuclear@0 117
nuclear@0 118 GLOBAL(void)
nuclear@0 119 jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
nuclear@0 120 {
nuclear@0 121 int i;
nuclear@0 122 JQUANT_TBL * qtbl;
nuclear@0 123 JHUFF_TBL * htbl;
nuclear@0 124
nuclear@0 125 for (i = 0; i < NUM_QUANT_TBLS; i++) {
nuclear@0 126 if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
nuclear@0 127 qtbl->sent_table = suppress;
nuclear@0 128 }
nuclear@0 129
nuclear@0 130 for (i = 0; i < NUM_HUFF_TBLS; i++) {
nuclear@0 131 if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
nuclear@0 132 htbl->sent_table = suppress;
nuclear@0 133 if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
nuclear@0 134 htbl->sent_table = suppress;
nuclear@0 135 }
nuclear@0 136 }
nuclear@0 137
nuclear@0 138
nuclear@0 139 /*
nuclear@0 140 * Finish JPEG compression.
nuclear@0 141 *
nuclear@0 142 * If a multipass operating mode was selected, this may do a great deal of
nuclear@0 143 * work including most of the actual output.
nuclear@0 144 */
nuclear@0 145
nuclear@0 146 GLOBAL(void)
nuclear@0 147 jpeg_finish_compress (j_compress_ptr cinfo)
nuclear@0 148 {
nuclear@0 149 JDIMENSION iMCU_row;
nuclear@0 150
nuclear@0 151 if (cinfo->global_state == CSTATE_SCANNING ||
nuclear@0 152 cinfo->global_state == CSTATE_RAW_OK) {
nuclear@0 153 /* Terminate first pass */
nuclear@0 154 if (cinfo->next_scanline < cinfo->image_height)
nuclear@0 155 ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
nuclear@0 156 (*cinfo->master->finish_pass) (cinfo);
nuclear@0 157 } else if (cinfo->global_state != CSTATE_WRCOEFS)
nuclear@0 158 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@0 159 /* Perform any remaining passes */
nuclear@0 160 while (! cinfo->master->is_last_pass) {
nuclear@0 161 (*cinfo->master->prepare_for_pass) (cinfo);
nuclear@0 162 for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
nuclear@0 163 if (cinfo->progress != NULL) {
nuclear@0 164 cinfo->progress->pass_counter = (long) iMCU_row;
nuclear@0 165 cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
nuclear@0 166 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
nuclear@0 167 }
nuclear@0 168 /* We bypass the main controller and invoke coef controller directly;
nuclear@0 169 * all work is being done from the coefficient buffer.
nuclear@0 170 */
nuclear@0 171 if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
nuclear@0 172 ERREXIT(cinfo, JERR_CANT_SUSPEND);
nuclear@0 173 }
nuclear@0 174 (*cinfo->master->finish_pass) (cinfo);
nuclear@0 175 }
nuclear@0 176 /* Write EOI, do final cleanup */
nuclear@0 177 (*cinfo->marker->write_file_trailer) (cinfo);
nuclear@0 178 (*cinfo->dest->term_destination) (cinfo);
nuclear@0 179 /* We can use jpeg_abort to release memory and reset global_state */
nuclear@0 180 jpeg_abort((j_common_ptr) cinfo);
nuclear@0 181 }
nuclear@0 182
nuclear@0 183
nuclear@0 184 /*
nuclear@0 185 * Write a special marker.
nuclear@0 186 * This is only recommended for writing COM or APPn markers.
nuclear@0 187 * Must be called after jpeg_start_compress() and before
nuclear@0 188 * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
nuclear@0 189 */
nuclear@0 190
nuclear@0 191 GLOBAL(void)
nuclear@0 192 jpeg_write_marker (j_compress_ptr cinfo, int marker,
nuclear@0 193 const JOCTET *dataptr, unsigned int datalen)
nuclear@0 194 {
nuclear@0 195 JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
nuclear@0 196
nuclear@0 197 if (cinfo->next_scanline != 0 ||
nuclear@0 198 (cinfo->global_state != CSTATE_SCANNING &&
nuclear@0 199 cinfo->global_state != CSTATE_RAW_OK &&
nuclear@0 200 cinfo->global_state != CSTATE_WRCOEFS))
nuclear@0 201 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@0 202
nuclear@0 203 (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
nuclear@0 204 write_marker_byte = cinfo->marker->write_marker_byte; /* copy for speed */
nuclear@0 205 while (datalen--) {
nuclear@0 206 (*write_marker_byte) (cinfo, *dataptr);
nuclear@0 207 dataptr++;
nuclear@0 208 }
nuclear@0 209 }
nuclear@0 210
nuclear@0 211 /* Same, but piecemeal. */
nuclear@0 212
nuclear@0 213 GLOBAL(void)
nuclear@0 214 jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
nuclear@0 215 {
nuclear@0 216 if (cinfo->next_scanline != 0 ||
nuclear@0 217 (cinfo->global_state != CSTATE_SCANNING &&
nuclear@0 218 cinfo->global_state != CSTATE_RAW_OK &&
nuclear@0 219 cinfo->global_state != CSTATE_WRCOEFS))
nuclear@0 220 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@0 221
nuclear@0 222 (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
nuclear@0 223 }
nuclear@0 224
nuclear@0 225 GLOBAL(void)
nuclear@0 226 jpeg_write_m_byte (j_compress_ptr cinfo, int val)
nuclear@0 227 {
nuclear@0 228 (*cinfo->marker->write_marker_byte) (cinfo, val);
nuclear@0 229 }
nuclear@0 230
nuclear@0 231
nuclear@0 232 /*
nuclear@0 233 * Alternate compression function: just write an abbreviated table file.
nuclear@0 234 * Before calling this, all parameters and a data destination must be set up.
nuclear@0 235 *
nuclear@0 236 * To produce a pair of files containing abbreviated tables and abbreviated
nuclear@0 237 * image data, one would proceed as follows:
nuclear@0 238 *
nuclear@0 239 * initialize JPEG object
nuclear@0 240 * set JPEG parameters
nuclear@0 241 * set destination to table file
nuclear@0 242 * jpeg_write_tables(cinfo);
nuclear@0 243 * set destination to image file
nuclear@0 244 * jpeg_start_compress(cinfo, FALSE);
nuclear@0 245 * write data...
nuclear@0 246 * jpeg_finish_compress(cinfo);
nuclear@0 247 *
nuclear@0 248 * jpeg_write_tables has the side effect of marking all tables written
nuclear@0 249 * (same as jpeg_suppress_tables(..., TRUE)). Thus a subsequent start_compress
nuclear@0 250 * will not re-emit the tables unless it is passed write_all_tables=TRUE.
nuclear@0 251 */
nuclear@0 252
nuclear@0 253 GLOBAL(void)
nuclear@0 254 jpeg_write_tables (j_compress_ptr cinfo)
nuclear@0 255 {
nuclear@0 256 if (cinfo->global_state != CSTATE_START)
nuclear@0 257 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@0 258
nuclear@0 259 /* (Re)initialize error mgr and destination modules */
nuclear@0 260 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
nuclear@0 261 (*cinfo->dest->init_destination) (cinfo);
nuclear@0 262 /* Initialize the marker writer ... bit of a crock to do it here. */
nuclear@0 263 jinit_marker_writer(cinfo);
nuclear@0 264 /* Write them tables! */
nuclear@0 265 (*cinfo->marker->write_tables_only) (cinfo);
nuclear@0 266 /* And clean up. */
nuclear@0 267 (*cinfo->dest->term_destination) (cinfo);
nuclear@0 268 /*
nuclear@0 269 * In library releases up through v6a, we called jpeg_abort() here to free
nuclear@0 270 * any working memory allocated by the destination manager and marker
nuclear@0 271 * writer. Some applications had a problem with that: they allocated space
nuclear@0 272 * of their own from the library memory manager, and didn't want it to go
nuclear@0 273 * away during write_tables. So now we do nothing. This will cause a
nuclear@0 274 * memory leak if an app calls write_tables repeatedly without doing a full
nuclear@0 275 * compression cycle or otherwise resetting the JPEG object. However, that
nuclear@0 276 * seems less bad than unexpectedly freeing memory in the normal case.
nuclear@0 277 * An app that prefers the old behavior can call jpeg_abort for itself after
nuclear@0 278 * each call to jpeg_write_tables().
nuclear@0 279 */
nuclear@0 280 }