Shoaib Ahmed / Mbed 2 deprecated uzairkhan

Final 350 project

Dependencies:   uzair Camera_LS_Y201 F7_Ethernet LCD_DISCO_F746NG NetworkAPI SDFileSystem mbed

includes/jdapistd.c@0:791a779d6220, 2017-07-31 (annotated)

Committer:
shoaib_ahmed
Date:
Mon Jul 31 09:16:35 2017 +0000
Revision:
0:791a779d6220
final project;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shoaib_ahmed 0:791a779d6220 1 /*
shoaib_ahmed 0:791a779d6220 2 * jdapistd.c
shoaib_ahmed 0:791a779d6220 3 *
shoaib_ahmed 0:791a779d6220 4 * Copyright (C) 1994-1996, Thomas G. Lane.
shoaib_ahmed 0:791a779d6220 5 * Modified 2002-2013 by Guido Vollbeding.
shoaib_ahmed 0:791a779d6220 6 * This file is part of the Independent JPEG Group's software.
shoaib_ahmed 0:791a779d6220 7 * For conditions of distribution and use, see the accompanying README file.
shoaib_ahmed 0:791a779d6220 8 *
shoaib_ahmed 0:791a779d6220 9 * This file contains application interface code for the decompression half
shoaib_ahmed 0:791a779d6220 10 * of the JPEG library. These are the "standard" API routines that are
shoaib_ahmed 0:791a779d6220 11 * used in the normal full-decompression case. They are not used by a
shoaib_ahmed 0:791a779d6220 12 * transcoding-only application. Note that if an application links in
shoaib_ahmed 0:791a779d6220 13 * jpeg_start_decompress, it will end up linking in the entire decompressor.
shoaib_ahmed 0:791a779d6220 14 * We thus must separate this file from jdapimin.c to avoid linking the
shoaib_ahmed 0:791a779d6220 15 * whole decompression library into a transcoder.
shoaib_ahmed 0:791a779d6220 16 */
shoaib_ahmed 0:791a779d6220 17
shoaib_ahmed 0:791a779d6220 18 #define JPEG_INTERNALS
shoaib_ahmed 0:791a779d6220 19 #include "jinclude.h"
shoaib_ahmed 0:791a779d6220 20 #include "jpeglib.h"
shoaib_ahmed 0:791a779d6220 21
shoaib_ahmed 0:791a779d6220 22
shoaib_ahmed 0:791a779d6220 23 /* Forward declarations */
shoaib_ahmed 0:791a779d6220 24 LOCAL(boolean) output_pass_setup JPP((j_decompress_ptr cinfo));
shoaib_ahmed 0:791a779d6220 25
shoaib_ahmed 0:791a779d6220 26
shoaib_ahmed 0:791a779d6220 27 /*
shoaib_ahmed 0:791a779d6220 28 * Decompression initialization.
shoaib_ahmed 0:791a779d6220 29 * jpeg_read_header must be completed before calling this.
shoaib_ahmed 0:791a779d6220 30 *
shoaib_ahmed 0:791a779d6220 31 * If a multipass operating mode was selected, this will do all but the
shoaib_ahmed 0:791a779d6220 32 * last pass, and thus may take a great deal of time.
shoaib_ahmed 0:791a779d6220 33 *
shoaib_ahmed 0:791a779d6220 34 * Returns FALSE if suspended. The return value need be inspected only if
shoaib_ahmed 0:791a779d6220 35 * a suspending data source is used.
shoaib_ahmed 0:791a779d6220 36 */
shoaib_ahmed 0:791a779d6220 37
shoaib_ahmed 0:791a779d6220 38 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 39 jpeg_start_decompress (j_decompress_ptr cinfo)
shoaib_ahmed 0:791a779d6220 40 {
shoaib_ahmed 0:791a779d6220 41 if (cinfo->global_state == DSTATE_READY) {
shoaib_ahmed 0:791a779d6220 42 /* First call: initialize master control, select active modules */
shoaib_ahmed 0:791a779d6220 43 jinit_master_decompress(cinfo);
shoaib_ahmed 0:791a779d6220 44 if (cinfo->buffered_image) {
shoaib_ahmed 0:791a779d6220 45 /* No more work here; expecting jpeg_start_output next */
shoaib_ahmed 0:791a779d6220 46 cinfo->global_state = DSTATE_BUFIMAGE;
shoaib_ahmed 0:791a779d6220 47 return TRUE;
shoaib_ahmed 0:791a779d6220 48 }
shoaib_ahmed 0:791a779d6220 49 cinfo->global_state = DSTATE_PRELOAD;
shoaib_ahmed 0:791a779d6220 50 }
shoaib_ahmed 0:791a779d6220 51 if (cinfo->global_state == DSTATE_PRELOAD) {
shoaib_ahmed 0:791a779d6220 52 /* If file has multiple scans, absorb them all into the coef buffer */
shoaib_ahmed 0:791a779d6220 53 if (cinfo->inputctl->has_multiple_scans) {
shoaib_ahmed 0:791a779d6220 54 #ifdef D_MULTISCAN_FILES_SUPPORTED
shoaib_ahmed 0:791a779d6220 55 for (;;) {
shoaib_ahmed 0:791a779d6220 56 int retcode;
shoaib_ahmed 0:791a779d6220 57 /* Call progress monitor hook if present */
shoaib_ahmed 0:791a779d6220 58 if (cinfo->progress != NULL)
shoaib_ahmed 0:791a779d6220 59 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
shoaib_ahmed 0:791a779d6220 60 /* Absorb some more input */
shoaib_ahmed 0:791a779d6220 61 retcode = (*cinfo->inputctl->consume_input) (cinfo);
shoaib_ahmed 0:791a779d6220 62 if (retcode == JPEG_SUSPENDED)
shoaib_ahmed 0:791a779d6220 63 return FALSE;
shoaib_ahmed 0:791a779d6220 64 if (retcode == JPEG_REACHED_EOI)
shoaib_ahmed 0:791a779d6220 65 break;
shoaib_ahmed 0:791a779d6220 66 /* Advance progress counter if appropriate */
shoaib_ahmed 0:791a779d6220 67 if (cinfo->progress != NULL &&
shoaib_ahmed 0:791a779d6220 68 (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
shoaib_ahmed 0:791a779d6220 69 if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
shoaib_ahmed 0:791a779d6220 70 /* jdmaster underestimated number of scans; ratchet up one scan */
shoaib_ahmed 0:791a779d6220 71 cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows;
shoaib_ahmed 0:791a779d6220 72 }
shoaib_ahmed 0:791a779d6220 73 }
shoaib_ahmed 0:791a779d6220 74 }
shoaib_ahmed 0:791a779d6220 75 #else
shoaib_ahmed 0:791a779d6220 76 ERREXIT(cinfo, JERR_NOT_COMPILED);
shoaib_ahmed 0:791a779d6220 77 #endif /* D_MULTISCAN_FILES_SUPPORTED */
shoaib_ahmed 0:791a779d6220 78 }
shoaib_ahmed 0:791a779d6220 79 cinfo->output_scan_number = cinfo->input_scan_number;
shoaib_ahmed 0:791a779d6220 80 } else if (cinfo->global_state != DSTATE_PRESCAN)
shoaib_ahmed 0:791a779d6220 81 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
shoaib_ahmed 0:791a779d6220 82 /* Perform any dummy output passes, and set up for the final pass */
shoaib_ahmed 0:791a779d6220 83 return output_pass_setup(cinfo);
shoaib_ahmed 0:791a779d6220 84 }
shoaib_ahmed 0:791a779d6220 85
shoaib_ahmed 0:791a779d6220 86
shoaib_ahmed 0:791a779d6220 87 /*
shoaib_ahmed 0:791a779d6220 88 * Set up for an output pass, and perform any dummy pass(es) needed.
shoaib_ahmed 0:791a779d6220 89 * Common subroutine for jpeg_start_decompress and jpeg_start_output.
shoaib_ahmed 0:791a779d6220 90 * Entry: global_state = DSTATE_PRESCAN only if previously suspended.
shoaib_ahmed 0:791a779d6220 91 * Exit: If done, returns TRUE and sets global_state for proper output mode.
shoaib_ahmed 0:791a779d6220 92 * If suspended, returns FALSE and sets global_state = DSTATE_PRESCAN.
shoaib_ahmed 0:791a779d6220 93 */
shoaib_ahmed 0:791a779d6220 94
shoaib_ahmed 0:791a779d6220 95 LOCAL(boolean)
shoaib_ahmed 0:791a779d6220 96 output_pass_setup (j_decompress_ptr cinfo)
shoaib_ahmed 0:791a779d6220 97 {
shoaib_ahmed 0:791a779d6220 98 if (cinfo->global_state != DSTATE_PRESCAN) {
shoaib_ahmed 0:791a779d6220 99 /* First call: do pass setup */
shoaib_ahmed 0:791a779d6220 100 (*cinfo->master->prepare_for_output_pass) (cinfo);
shoaib_ahmed 0:791a779d6220 101 cinfo->output_scanline = 0;
shoaib_ahmed 0:791a779d6220 102 cinfo->global_state = DSTATE_PRESCAN;
shoaib_ahmed 0:791a779d6220 103 }
shoaib_ahmed 0:791a779d6220 104 /* Loop over any required dummy passes */
shoaib_ahmed 0:791a779d6220 105 while (cinfo->master->is_dummy_pass) {
shoaib_ahmed 0:791a779d6220 106 #ifdef QUANT_2PASS_SUPPORTED
shoaib_ahmed 0:791a779d6220 107 /* Crank through the dummy pass */
shoaib_ahmed 0:791a779d6220 108 while (cinfo->output_scanline < cinfo->output_height) {
shoaib_ahmed 0:791a779d6220 109 JDIMENSION last_scanline;
shoaib_ahmed 0:791a779d6220 110 /* Call progress monitor hook if present */
shoaib_ahmed 0:791a779d6220 111 if (cinfo->progress != NULL) {
shoaib_ahmed 0:791a779d6220 112 cinfo->progress->pass_counter = (long) cinfo->output_scanline;
shoaib_ahmed 0:791a779d6220 113 cinfo->progress->pass_limit = (long) cinfo->output_height;
shoaib_ahmed 0:791a779d6220 114 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
shoaib_ahmed 0:791a779d6220 115 }
shoaib_ahmed 0:791a779d6220 116 /* Process some data */
shoaib_ahmed 0:791a779d6220 117 last_scanline = cinfo->output_scanline;
shoaib_ahmed 0:791a779d6220 118 (*cinfo->main->process_data) (cinfo, (JSAMPARRAY) NULL,
shoaib_ahmed 0:791a779d6220 119 &cinfo->output_scanline, (JDIMENSION) 0);
shoaib_ahmed 0:791a779d6220 120 if (cinfo->output_scanline == last_scanline)
shoaib_ahmed 0:791a779d6220 121 return FALSE; /* No progress made, must suspend */
shoaib_ahmed 0:791a779d6220 122 }
shoaib_ahmed 0:791a779d6220 123 /* Finish up dummy pass, and set up for another one */
shoaib_ahmed 0:791a779d6220 124 (*cinfo->master->finish_output_pass) (cinfo);
shoaib_ahmed 0:791a779d6220 125 (*cinfo->master->prepare_for_output_pass) (cinfo);
shoaib_ahmed 0:791a779d6220 126 cinfo->output_scanline = 0;
shoaib_ahmed 0:791a779d6220 127 #else
shoaib_ahmed 0:791a779d6220 128 ERREXIT(cinfo, JERR_NOT_COMPILED);
shoaib_ahmed 0:791a779d6220 129 #endif /* QUANT_2PASS_SUPPORTED */
shoaib_ahmed 0:791a779d6220 130 }
shoaib_ahmed 0:791a779d6220 131 /* Ready for application to drive output pass through
shoaib_ahmed 0:791a779d6220 132 * jpeg_read_scanlines or jpeg_read_raw_data.
shoaib_ahmed 0:791a779d6220 133 */
shoaib_ahmed 0:791a779d6220 134 cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING;
shoaib_ahmed 0:791a779d6220 135 return TRUE;
shoaib_ahmed 0:791a779d6220 136 }
shoaib_ahmed 0:791a779d6220 137
shoaib_ahmed 0:791a779d6220 138
shoaib_ahmed 0:791a779d6220 139 /*
shoaib_ahmed 0:791a779d6220 140 * Read some scanlines of data from the JPEG decompressor.
shoaib_ahmed 0:791a779d6220 141 *
shoaib_ahmed 0:791a779d6220 142 * The return value will be the number of lines actually read.
shoaib_ahmed 0:791a779d6220 143 * This may be less than the number requested in several cases,
shoaib_ahmed 0:791a779d6220 144 * including bottom of image, data source suspension, and operating
shoaib_ahmed 0:791a779d6220 145 * modes that emit multiple scanlines at a time.
shoaib_ahmed 0:791a779d6220 146 *
shoaib_ahmed 0:791a779d6220 147 * Note: we warn about excess calls to jpeg_read_scanlines() since
shoaib_ahmed 0:791a779d6220 148 * this likely signals an application programmer error. However,
shoaib_ahmed 0:791a779d6220 149 * an oversize buffer (max_lines > scanlines remaining) is not an error.
shoaib_ahmed 0:791a779d6220 150 */
shoaib_ahmed 0:791a779d6220 151
shoaib_ahmed 0:791a779d6220 152 GLOBAL(JDIMENSION)
shoaib_ahmed 0:791a779d6220 153 jpeg_read_scanlines (j_decompress_ptr cinfo, JSAMPARRAY scanlines,
shoaib_ahmed 0:791a779d6220 154 JDIMENSION max_lines)
shoaib_ahmed 0:791a779d6220 155 {
shoaib_ahmed 0:791a779d6220 156 JDIMENSION row_ctr;
shoaib_ahmed 0:791a779d6220 157
shoaib_ahmed 0:791a779d6220 158 if (cinfo->global_state != DSTATE_SCANNING)
shoaib_ahmed 0:791a779d6220 159 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
shoaib_ahmed 0:791a779d6220 160 if (cinfo->output_scanline >= cinfo->output_height) {
shoaib_ahmed 0:791a779d6220 161 WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
shoaib_ahmed 0:791a779d6220 162 return 0;
shoaib_ahmed 0:791a779d6220 163 }
shoaib_ahmed 0:791a779d6220 164
shoaib_ahmed 0:791a779d6220 165 /* Call progress monitor hook if present */
shoaib_ahmed 0:791a779d6220 166 if (cinfo->progress != NULL) {
shoaib_ahmed 0:791a779d6220 167 cinfo->progress->pass_counter = (long) cinfo->output_scanline;
shoaib_ahmed 0:791a779d6220 168 cinfo->progress->pass_limit = (long) cinfo->output_height;
shoaib_ahmed 0:791a779d6220 169 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
shoaib_ahmed 0:791a779d6220 170 }
shoaib_ahmed 0:791a779d6220 171
shoaib_ahmed 0:791a779d6220 172 /* Process some data */
shoaib_ahmed 0:791a779d6220 173 row_ctr = 0;
shoaib_ahmed 0:791a779d6220 174 (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines);
shoaib_ahmed 0:791a779d6220 175 cinfo->output_scanline += row_ctr;
shoaib_ahmed 0:791a779d6220 176 return row_ctr;
shoaib_ahmed 0:791a779d6220 177 }
shoaib_ahmed 0:791a779d6220 178
shoaib_ahmed 0:791a779d6220 179
shoaib_ahmed 0:791a779d6220 180 /*
shoaib_ahmed 0:791a779d6220 181 * Alternate entry point to read raw data.
shoaib_ahmed 0:791a779d6220 182 * Processes exactly one iMCU row per call, unless suspended.
shoaib_ahmed 0:791a779d6220 183 */
shoaib_ahmed 0:791a779d6220 184
shoaib_ahmed 0:791a779d6220 185 GLOBAL(JDIMENSION)
shoaib_ahmed 0:791a779d6220 186 jpeg_read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data,
shoaib_ahmed 0:791a779d6220 187 JDIMENSION max_lines)
shoaib_ahmed 0:791a779d6220 188 {
shoaib_ahmed 0:791a779d6220 189 JDIMENSION lines_per_iMCU_row;
shoaib_ahmed 0:791a779d6220 190
shoaib_ahmed 0:791a779d6220 191 if (cinfo->global_state != DSTATE_RAW_OK)
shoaib_ahmed 0:791a779d6220 192 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
shoaib_ahmed 0:791a779d6220 193 if (cinfo->output_scanline >= cinfo->output_height) {
shoaib_ahmed 0:791a779d6220 194 WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
shoaib_ahmed 0:791a779d6220 195 return 0;
shoaib_ahmed 0:791a779d6220 196 }
shoaib_ahmed 0:791a779d6220 197
shoaib_ahmed 0:791a779d6220 198 /* Call progress monitor hook if present */
shoaib_ahmed 0:791a779d6220 199 if (cinfo->progress != NULL) {
shoaib_ahmed 0:791a779d6220 200 cinfo->progress->pass_counter = (long) cinfo->output_scanline;
shoaib_ahmed 0:791a779d6220 201 cinfo->progress->pass_limit = (long) cinfo->output_height;
shoaib_ahmed 0:791a779d6220 202 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
shoaib_ahmed 0:791a779d6220 203 }
shoaib_ahmed 0:791a779d6220 204
shoaib_ahmed 0:791a779d6220 205 /* Verify that at least one iMCU row can be returned. */
shoaib_ahmed 0:791a779d6220 206 lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->min_DCT_v_scaled_size;
shoaib_ahmed 0:791a779d6220 207 if (max_lines < lines_per_iMCU_row)
shoaib_ahmed 0:791a779d6220 208 ERREXIT(cinfo, JERR_BUFFER_SIZE);
shoaib_ahmed 0:791a779d6220 209
shoaib_ahmed 0:791a779d6220 210 /* Decompress directly into user's buffer. */
shoaib_ahmed 0:791a779d6220 211 if (! (*cinfo->coef->decompress_data) (cinfo, data))
shoaib_ahmed 0:791a779d6220 212 return 0; /* suspension forced, can do nothing more */
shoaib_ahmed 0:791a779d6220 213
shoaib_ahmed 0:791a779d6220 214 /* OK, we processed one iMCU row. */
shoaib_ahmed 0:791a779d6220 215 cinfo->output_scanline += lines_per_iMCU_row;
shoaib_ahmed 0:791a779d6220 216 return lines_per_iMCU_row;
shoaib_ahmed 0:791a779d6220 217 }
shoaib_ahmed 0:791a779d6220 218
shoaib_ahmed 0:791a779d6220 219
shoaib_ahmed 0:791a779d6220 220 /* Additional entry points for buffered-image mode. */
shoaib_ahmed 0:791a779d6220 221
shoaib_ahmed 0:791a779d6220 222 #ifdef D_MULTISCAN_FILES_SUPPORTED
shoaib_ahmed 0:791a779d6220 223
shoaib_ahmed 0:791a779d6220 224 /*
shoaib_ahmed 0:791a779d6220 225 * Initialize for an output pass in buffered-image mode.
shoaib_ahmed 0:791a779d6220 226 */
shoaib_ahmed 0:791a779d6220 227
shoaib_ahmed 0:791a779d6220 228 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 229 jpeg_start_output (j_decompress_ptr cinfo, int scan_number)
shoaib_ahmed 0:791a779d6220 230 {
shoaib_ahmed 0:791a779d6220 231 if (cinfo->global_state != DSTATE_BUFIMAGE &&
shoaib_ahmed 0:791a779d6220 232 cinfo->global_state != DSTATE_PRESCAN)
shoaib_ahmed 0:791a779d6220 233 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
shoaib_ahmed 0:791a779d6220 234 /* Limit scan number to valid range */
shoaib_ahmed 0:791a779d6220 235 if (scan_number <= 0)
shoaib_ahmed 0:791a779d6220 236 scan_number = 1;
shoaib_ahmed 0:791a779d6220 237 if (cinfo->inputctl->eoi_reached &&
shoaib_ahmed 0:791a779d6220 238 scan_number > cinfo->input_scan_number)
shoaib_ahmed 0:791a779d6220 239 scan_number = cinfo->input_scan_number;
shoaib_ahmed 0:791a779d6220 240 cinfo->output_scan_number = scan_number;
shoaib_ahmed 0:791a779d6220 241 /* Perform any dummy output passes, and set up for the real pass */
shoaib_ahmed 0:791a779d6220 242 return output_pass_setup(cinfo);
shoaib_ahmed 0:791a779d6220 243 }
shoaib_ahmed 0:791a779d6220 244
shoaib_ahmed 0:791a779d6220 245
shoaib_ahmed 0:791a779d6220 246 /*
shoaib_ahmed 0:791a779d6220 247 * Finish up after an output pass in buffered-image mode.
shoaib_ahmed 0:791a779d6220 248 *
shoaib_ahmed 0:791a779d6220 249 * Returns FALSE if suspended. The return value need be inspected only if
shoaib_ahmed 0:791a779d6220 250 * a suspending data source is used.
shoaib_ahmed 0:791a779d6220 251 */
shoaib_ahmed 0:791a779d6220 252
shoaib_ahmed 0:791a779d6220 253 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 254 jpeg_finish_output (j_decompress_ptr cinfo)
shoaib_ahmed 0:791a779d6220 255 {
shoaib_ahmed 0:791a779d6220 256 if ((cinfo->global_state == DSTATE_SCANNING ||
shoaib_ahmed 0:791a779d6220 257 cinfo->global_state == DSTATE_RAW_OK) && cinfo->buffered_image) {
shoaib_ahmed 0:791a779d6220 258 /* Terminate this pass. */
shoaib_ahmed 0:791a779d6220 259 /* We do not require the whole pass to have been completed. */
shoaib_ahmed 0:791a779d6220 260 (*cinfo->master->finish_output_pass) (cinfo);
shoaib_ahmed 0:791a779d6220 261 cinfo->global_state = DSTATE_BUFPOST;
shoaib_ahmed 0:791a779d6220 262 } else if (cinfo->global_state != DSTATE_BUFPOST) {
shoaib_ahmed 0:791a779d6220 263 /* BUFPOST = repeat call after a suspension, anything else is error */
shoaib_ahmed 0:791a779d6220 264 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
shoaib_ahmed 0:791a779d6220 265 }
shoaib_ahmed 0:791a779d6220 266 /* Read markers looking for SOS or EOI */
shoaib_ahmed 0:791a779d6220 267 while (cinfo->input_scan_number <= cinfo->output_scan_number &&
shoaib_ahmed 0:791a779d6220 268 ! cinfo->inputctl->eoi_reached) {
shoaib_ahmed 0:791a779d6220 269 if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
shoaib_ahmed 0:791a779d6220 270 return FALSE; /* Suspend, come back later */
shoaib_ahmed 0:791a779d6220 271 }
shoaib_ahmed 0:791a779d6220 272 cinfo->global_state = DSTATE_BUFIMAGE;
shoaib_ahmed 0:791a779d6220 273 return TRUE;
shoaib_ahmed 0:791a779d6220 274 }
shoaib_ahmed 0:791a779d6220 275
shoaib_ahmed 0:791a779d6220 276 #endif /* D_MULTISCAN_FILES_SUPPORTED */