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) 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) 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) 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) 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) 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) 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) 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) 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) 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
