Doxygen Source Code Documentation
jdapimin.c File Reference
#include "jinclude.h"
#include "jpeglib.h"
Go to the source code of this file.
Defines | |
#define | JPEG_INTERNALS |
Functions | |
jpeg_CreateDecompress (j_decompress_ptr cinfo, int version, size_t structsize) | |
jpeg_destroy_decompress (j_decompress_ptr cinfo) | |
jpeg_abort_decompress (j_decompress_ptr cinfo) | |
default_decompress_parms (j_decompress_ptr cinfo) | |
jpeg_read_header (j_decompress_ptr cinfo, boolean require_image) | |
jpeg_consume_input (j_decompress_ptr cinfo) | |
jpeg_input_complete (j_decompress_ptr cinfo) | |
jpeg_has_multiple_scans (j_decompress_ptr cinfo) | |
jpeg_finish_decompress (j_decompress_ptr cinfo) |
Define Documentation
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Definition at line 19 of file jdapimin.c. |
Function Documentation
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Definition at line 114 of file jdapimin.c. References jpeg_decompress_struct::Adobe_transform, jpeg_decompress_struct::buffered_image, jpeg_decompress_struct::colormap, jpeg_decompress_struct::comp_info, jpeg_component_info::component_id, jpeg_decompress_struct::dct_method, jpeg_decompress_struct::desired_number_of_colors, jpeg_decompress_struct::dither_mode, jpeg_decompress_struct::do_block_smoothing, jpeg_decompress_struct::do_fancy_upsampling, jpeg_decompress_struct::enable_1pass_quant, jpeg_decompress_struct::enable_2pass_quant, jpeg_decompress_struct::enable_external_quant, JCS_CMYK, JCS_GRAYSCALE, JCS_RGB, JCS_UNKNOWN, JCS_YCbCr, JCS_YCCK, JDCT_DEFAULT, JDITHER_FS, jpeg_decompress_struct::jpeg_color_space, JTRC_UNKNOWN_IDS, jpeg_decompress_struct::num_components, jpeg_decompress_struct::out_color_space, jpeg_decompress_struct::output_gamma, jpeg_decompress_struct::quantize_colors, jpeg_decompress_struct::raw_data_out, jpeg_decompress_struct::saw_Adobe_marker, jpeg_decompress_struct::saw_JFIF_marker, jpeg_decompress_struct::scale_denom, jpeg_decompress_struct::scale_num, TRACEMS3, jpeg_decompress_struct::two_pass_quantize, and WARNMS1. Referenced by jpeg_consume_input().
00115 { 00116 /* Guess the input colorspace, and set output colorspace accordingly. */ 00117 /* (Wish JPEG committee had provided a real way to specify this...) */ 00118 /* Note application may override our guesses. */ 00119 switch (cinfo->num_components) { 00120 case 1: 00121 cinfo->jpeg_color_space = JCS_GRAYSCALE; 00122 cinfo->out_color_space = JCS_GRAYSCALE; 00123 break; 00124 00125 case 3: 00126 if (cinfo->saw_JFIF_marker) { 00127 cinfo->jpeg_color_space = JCS_YCbCr; /* JFIF implies YCbCr */ 00128 } else if (cinfo->saw_Adobe_marker) { 00129 switch (cinfo->Adobe_transform) { 00130 case 0: 00131 cinfo->jpeg_color_space = JCS_RGB; 00132 break; 00133 case 1: 00134 cinfo->jpeg_color_space = JCS_YCbCr; 00135 break; 00136 default: 00137 WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform); 00138 cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ 00139 break; 00140 } 00141 } else { 00142 /* Saw no special markers, try to guess from the component IDs */ 00143 int cid0 = cinfo->comp_info[0].component_id; 00144 int cid1 = cinfo->comp_info[1].component_id; 00145 int cid2 = cinfo->comp_info[2].component_id; 00146 00147 if (cid0 == 1 && cid1 == 2 && cid2 == 3) 00148 cinfo->jpeg_color_space = JCS_YCbCr; /* assume JFIF w/out marker */ 00149 else if (cid0 == 82 && cid1 == 71 && cid2 == 66) 00150 cinfo->jpeg_color_space = JCS_RGB; /* ASCII 'R', 'G', 'B' */ 00151 else { 00152 TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2); 00153 cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ 00154 } 00155 } 00156 /* Always guess RGB is proper output colorspace. */ 00157 cinfo->out_color_space = JCS_RGB; 00158 break; 00159 00160 case 4: 00161 if (cinfo->saw_Adobe_marker) { 00162 switch (cinfo->Adobe_transform) { 00163 case 0: 00164 cinfo->jpeg_color_space = JCS_CMYK; 00165 break; 00166 case 2: 00167 cinfo->jpeg_color_space = JCS_YCCK; 00168 break; 00169 default: 00170 WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform); 00171 cinfo->jpeg_color_space = JCS_YCCK; /* assume it's YCCK */ 00172 break; 00173 } 00174 } else { 00175 /* No special markers, assume straight CMYK. */ 00176 cinfo->jpeg_color_space = JCS_CMYK; 00177 } 00178 cinfo->out_color_space = JCS_CMYK; 00179 break; 00180 00181 default: 00182 cinfo->jpeg_color_space = JCS_UNKNOWN; 00183 cinfo->out_color_space = JCS_UNKNOWN; 00184 break; 00185 } 00186 00187 /* Set defaults for other decompression parameters. */ 00188 cinfo->scale_num = 1; /* 1:1 scaling */ 00189 cinfo->scale_denom = 1; 00190 cinfo->output_gamma = 1.0; 00191 cinfo->buffered_image = FALSE; 00192 cinfo->raw_data_out = FALSE; 00193 cinfo->dct_method = JDCT_DEFAULT; 00194 cinfo->do_fancy_upsampling = TRUE; 00195 cinfo->do_block_smoothing = TRUE; 00196 cinfo->quantize_colors = FALSE; 00197 /* We set these in case application only sets quantize_colors. */ 00198 cinfo->dither_mode = JDITHER_FS; 00199 #ifdef QUANT_2PASS_SUPPORTED 00200 cinfo->two_pass_quantize = TRUE; 00201 #else 00202 cinfo->two_pass_quantize = FALSE; 00203 #endif 00204 cinfo->desired_number_of_colors = 256; 00205 cinfo->colormap = NULL; 00206 /* Initialize for no mode change in buffered-image mode. */ 00207 cinfo->enable_1pass_quant = FALSE; 00208 cinfo->enable_external_quant = FALSE; 00209 cinfo->enable_2pass_quant = FALSE; 00210 } |
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Definition at line 103 of file jdapimin.c. References jpeg_abort().
00104 { 00105 jpeg_abort((j_common_ptr) cinfo); /* use common routine */ 00106 } |
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Definition at line 287 of file jdapimin.c. References default_decompress_parms(), DSTATE_BUFIMAGE, DSTATE_BUFPOST, DSTATE_INHEADER, DSTATE_PRELOAD, DSTATE_PRESCAN, DSTATE_RAW_OK, DSTATE_READY, DSTATE_SCANNING, DSTATE_START, DSTATE_STOPPING, ERREXIT1, jpeg_decompress_struct::inputctl, JPEG_REACHED_SOS, JPEG_SUSPENDED, retcode, and jpeg_decompress_struct::src. Referenced by jpeg_read_header().
00288 { 00289 int retcode = JPEG_SUSPENDED; 00290 00291 /* NB: every possible DSTATE value should be listed in this switch */ 00292 switch (cinfo->global_state) { 00293 case DSTATE_START: 00294 /* Start-of-datastream actions: reset appropriate modules */ 00295 (*cinfo->inputctl->reset_input_controller) (cinfo); 00296 /* Initialize application's data source module */ 00297 (*cinfo->src->init_source) (cinfo); 00298 cinfo->global_state = DSTATE_INHEADER; 00299 /*FALLTHROUGH*/ 00300 case DSTATE_INHEADER: 00301 retcode = (*cinfo->inputctl->consume_input) (cinfo); 00302 if (retcode == JPEG_REACHED_SOS) { /* Found SOS, prepare to decompress */ 00303 /* Set up default parameters based on header data */ 00304 default_decompress_parms(cinfo); 00305 /* Set global state: ready for start_decompress */ 00306 cinfo->global_state = DSTATE_READY; 00307 } 00308 break; 00309 case DSTATE_READY: 00310 /* Can't advance past first SOS until start_decompress is called */ 00311 retcode = JPEG_REACHED_SOS; 00312 break; 00313 case DSTATE_PRELOAD: 00314 case DSTATE_PRESCAN: 00315 case DSTATE_SCANNING: 00316 case DSTATE_RAW_OK: 00317 case DSTATE_BUFIMAGE: 00318 case DSTATE_BUFPOST: 00319 case DSTATE_STOPPING: 00320 retcode = (*cinfo->inputctl->consume_input) (cinfo); 00321 break; 00322 default: 00323 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 00324 } 00325 return retcode; 00326 } |
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Definition at line 30 of file jdapimin.c. References jpeg_decompress_struct::ac_huff_tbl_ptrs, client_data, jpeg_decompress_struct::dc_huff_tbl_ptrs, DSTATE_START, ERREXIT2, i, JERR_BAD_LIB_VERSION, jinit_input_controller(), jinit_marker_reader(), jinit_memory_mgr(), JPEG_LIB_VERSION, jpeg_decompress_struct::marker_list, MEMZERO, NUM_HUFF_TBLS, NUM_QUANT_TBLS, jpeg_decompress_struct::quant_tbl_ptrs, SIZEOF, jpeg_decompress_struct::src, and structsize.
00031 { 00032 int i; 00033 00034 /* Guard against version mismatches between library and caller. */ 00035 cinfo->mem = NULL; /* so jpeg_destroy knows mem mgr not called */ 00036 if (version != JPEG_LIB_VERSION) 00037 ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version); 00038 if (structsize != SIZEOF(struct jpeg_decompress_struct)) 00039 ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 00040 (int) SIZEOF(struct jpeg_decompress_struct), (int) structsize); 00041 00042 /* For debugging purposes, we zero the whole master structure. 00043 * But the application has already set the err pointer, and may have set 00044 * client_data, so we have to save and restore those fields. 00045 * Note: if application hasn't set client_data, tools like Purify may 00046 * complain here. 00047 */ 00048 { 00049 struct jpeg_error_mgr * err = cinfo->err; 00050 void * client_data = cinfo->client_data; /* ignore Purify complaint here */ 00051 MEMZERO(cinfo, SIZEOF(struct jpeg_decompress_struct)); 00052 cinfo->err = err; 00053 cinfo->client_data = client_data; 00054 } 00055 cinfo->is_decompressor = TRUE; 00056 00057 /* Initialize a memory manager instance for this object */ 00058 jinit_memory_mgr((j_common_ptr) cinfo); 00059 00060 /* Zero out pointers to permanent structures. */ 00061 cinfo->progress = NULL; 00062 cinfo->src = NULL; 00063 00064 for (i = 0; i < NUM_QUANT_TBLS; i++) 00065 cinfo->quant_tbl_ptrs[i] = NULL; 00066 00067 for (i = 0; i < NUM_HUFF_TBLS; i++) { 00068 cinfo->dc_huff_tbl_ptrs[i] = NULL; 00069 cinfo->ac_huff_tbl_ptrs[i] = NULL; 00070 } 00071 00072 /* Initialize marker processor so application can override methods 00073 * for COM, APPn markers before calling jpeg_read_header. 00074 */ 00075 cinfo->marker_list = NULL; 00076 jinit_marker_reader(cinfo); 00077 00078 /* And initialize the overall input controller. */ 00079 jinit_input_controller(cinfo); 00080 00081 /* OK, I'm ready */ 00082 cinfo->global_state = DSTATE_START; 00083 } |
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Definition at line 91 of file jdapimin.c. References jpeg_destroy(). Referenced by main(), and read_JPEG_file().
00092 { 00093 jpeg_destroy((j_common_ptr) cinfo); /* use common routine */ 00094 } |
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Definition at line 369 of file jdapimin.c. References jpeg_decompress_struct::buffered_image, DSTATE_BUFIMAGE, DSTATE_RAW_OK, DSTATE_SCANNING, DSTATE_STOPPING, jpeg_input_controller::eoi_reached, ERREXIT, ERREXIT1, jpeg_decompress_struct::inputctl, jpeg_abort(), JPEG_SUSPENDED, jpeg_decompress_struct::master, jpeg_decompress_struct::output_height, jpeg_decompress_struct::output_scanline, and jpeg_decompress_struct::src. Referenced by main(), and read_JPEG_file().
00370 { 00371 if ((cinfo->global_state == DSTATE_SCANNING || 00372 cinfo->global_state == DSTATE_RAW_OK) && ! cinfo->buffered_image) { 00373 /* Terminate final pass of non-buffered mode */ 00374 if (cinfo->output_scanline < cinfo->output_height) 00375 ERREXIT(cinfo, JERR_TOO_LITTLE_DATA); 00376 (*cinfo->master->finish_output_pass) (cinfo); 00377 cinfo->global_state = DSTATE_STOPPING; 00378 } else if (cinfo->global_state == DSTATE_BUFIMAGE) { 00379 /* Finishing after a buffered-image operation */ 00380 cinfo->global_state = DSTATE_STOPPING; 00381 } else if (cinfo->global_state != DSTATE_STOPPING) { 00382 /* STOPPING = repeat call after a suspension, anything else is error */ 00383 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 00384 } 00385 /* Read until EOI */ 00386 while (! cinfo->inputctl->eoi_reached) { 00387 if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) 00388 return FALSE; /* Suspend, come back later */ 00389 } 00390 /* Do final cleanup */ 00391 (*cinfo->src->term_source) (cinfo); 00392 /* We can use jpeg_abort to release memory and reset global_state */ 00393 jpeg_abort((j_common_ptr) cinfo); 00394 return TRUE; 00395 } |
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Definition at line 349 of file jdapimin.c. References DSTATE_READY, DSTATE_STOPPING, ERREXIT1, jpeg_input_controller::has_multiple_scans, and jpeg_decompress_struct::inputctl.
00350 { 00351 /* Only valid after jpeg_read_header completes */ 00352 if (cinfo->global_state < DSTATE_READY || 00353 cinfo->global_state > DSTATE_STOPPING) 00354 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 00355 return cinfo->inputctl->has_multiple_scans; 00356 } |
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Definition at line 334 of file jdapimin.c. References DSTATE_START, DSTATE_STOPPING, jpeg_input_controller::eoi_reached, ERREXIT1, and jpeg_decompress_struct::inputctl.
00335 { 00336 /* Check for valid jpeg object */ 00337 if (cinfo->global_state < DSTATE_START || 00338 cinfo->global_state > DSTATE_STOPPING) 00339 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 00340 return cinfo->inputctl->eoi_reached; 00341 } |
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Definition at line 241 of file jdapimin.c. References DSTATE_INHEADER, DSTATE_START, ERREXIT, ERREXIT1, jpeg_abort(), jpeg_consume_input(), JPEG_HEADER_OK, JPEG_HEADER_TABLES_ONLY, JPEG_REACHED_EOI, JPEG_REACHED_SOS, JPEG_SUSPENDED, require_image, and retcode. Referenced by main(), and read_JPEG_file().
00242 { 00243 int retcode; 00244 00245 if (cinfo->global_state != DSTATE_START && 00246 cinfo->global_state != DSTATE_INHEADER) 00247 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 00248 00249 retcode = jpeg_consume_input(cinfo); 00250 00251 switch (retcode) { 00252 case JPEG_REACHED_SOS: 00253 retcode = JPEG_HEADER_OK; 00254 break; 00255 case JPEG_REACHED_EOI: 00256 if (require_image) /* Complain if application wanted an image */ 00257 ERREXIT(cinfo, JERR_NO_IMAGE); 00258 /* Reset to start state; it would be safer to require the application to 00259 * call jpeg_abort, but we can't change it now for compatibility reasons. 00260 * A side effect is to free any temporary memory (there shouldn't be any). 00261 */ 00262 jpeg_abort((j_common_ptr) cinfo); /* sets state = DSTATE_START */ 00263 retcode = JPEG_HEADER_TABLES_ONLY; 00264 break; 00265 case JPEG_SUSPENDED: 00266 /* no work */ 00267 break; 00268 } 00269 00270 return retcode; 00271 } |