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annotate libs/libjpeg/jctrans.c @ 19:94b8ef9b8caa

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restored C++
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 10 Jun 2015 22:28:48 +0300
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nuclear@14 1 /*
nuclear@14 2 * jctrans.c
nuclear@14 3 *
nuclear@14 4 * Copyright (C) 1995-1998, Thomas G. Lane.
nuclear@14 5 * This file is part of the Independent JPEG Group's software.
nuclear@14 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@14 7 *
nuclear@14 8 * This file contains library routines for transcoding compression,
nuclear@14 9 * that is, writing raw DCT coefficient arrays to an output JPEG file.
nuclear@14 10 * The routines in jcapimin.c will also be needed by a transcoder.
nuclear@14 11 */
nuclear@14 12
nuclear@14 13 #define JPEG_INTERNALS
nuclear@14 14 #include "jinclude.h"
nuclear@14 15 #include "jpeglib.h"
nuclear@14 16
nuclear@14 17
nuclear@14 18 /* Forward declarations */
nuclear@14 19 LOCAL(void) transencode_master_selection
nuclear@14 20 JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
nuclear@14 21 LOCAL(void) transencode_coef_controller
nuclear@14 22 JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
nuclear@14 23
nuclear@14 24
nuclear@14 25 /*
nuclear@14 26 * Compression initialization for writing raw-coefficient data.
nuclear@14 27 * Before calling this, all parameters and a data destination must be set up.
nuclear@14 28 * Call jpeg_finish_compress() to actually write the data.
nuclear@14 29 *
nuclear@14 30 * The number of passed virtual arrays must match cinfo->num_components.
nuclear@14 31 * Note that the virtual arrays need not be filled or even realized at
nuclear@14 32 * the time write_coefficients is called; indeed, if the virtual arrays
nuclear@14 33 * were requested from this compression object's memory manager, they
nuclear@14 34 * typically will be realized during this routine and filled afterwards.
nuclear@14 35 */
nuclear@14 36
nuclear@14 37 GLOBAL(void)
nuclear@14 38 jpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)
nuclear@14 39 {
nuclear@14 40 if (cinfo->global_state != CSTATE_START)
nuclear@14 41 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 42 /* Mark all tables to be written */
nuclear@14 43 jpeg_suppress_tables(cinfo, FALSE);
nuclear@14 44 /* (Re)initialize error mgr and destination modules */
nuclear@14 45 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
nuclear@14 46 (*cinfo->dest->init_destination) (cinfo);
nuclear@14 47 /* Perform master selection of active modules */
nuclear@14 48 transencode_master_selection(cinfo, coef_arrays);
nuclear@14 49 /* Wait for jpeg_finish_compress() call */
nuclear@14 50 cinfo->next_scanline = 0; /* so jpeg_write_marker works */
nuclear@14 51 cinfo->global_state = CSTATE_WRCOEFS;
nuclear@14 52 }
nuclear@14 53
nuclear@14 54
nuclear@14 55 /*
nuclear@14 56 * Initialize the compression object with default parameters,
nuclear@14 57 * then copy from the source object all parameters needed for lossless
nuclear@14 58 * transcoding. Parameters that can be varied without loss (such as
nuclear@14 59 * scan script and Huffman optimization) are left in their default states.
nuclear@14 60 */
nuclear@14 61
nuclear@14 62 GLOBAL(void)
nuclear@14 63 jpeg_copy_critical_parameters (j_decompress_ptr srcinfo,
nuclear@14 64 j_compress_ptr dstinfo)
nuclear@14 65 {
nuclear@14 66 JQUANT_TBL ** qtblptr;
nuclear@14 67 jpeg_component_info *incomp, *outcomp;
nuclear@14 68 JQUANT_TBL *c_quant, *slot_quant;
nuclear@14 69 int tblno, ci, coefi;
nuclear@14 70
nuclear@14 71 /* Safety check to ensure start_compress not called yet. */
nuclear@14 72 if (dstinfo->global_state != CSTATE_START)
nuclear@14 73 ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state);
nuclear@14 74 /* Copy fundamental image dimensions */
nuclear@14 75 dstinfo->image_width = srcinfo->image_width;
nuclear@14 76 dstinfo->image_height = srcinfo->image_height;
nuclear@14 77 dstinfo->input_components = srcinfo->num_components;
nuclear@14 78 dstinfo->in_color_space = srcinfo->jpeg_color_space;
nuclear@14 79 /* Initialize all parameters to default values */
nuclear@14 80 jpeg_set_defaults(dstinfo);
nuclear@14 81 /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
nuclear@14 82 * Fix it to get the right header markers for the image colorspace.
nuclear@14 83 */
nuclear@14 84 jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space);
nuclear@14 85 dstinfo->data_precision = srcinfo->data_precision;
nuclear@14 86 dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling;
nuclear@14 87 /* Copy the source's quantization tables. */
nuclear@14 88 for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
nuclear@14 89 if (srcinfo->quant_tbl_ptrs[tblno] != NULL) {
nuclear@14 90 qtblptr = & dstinfo->quant_tbl_ptrs[tblno];
nuclear@14 91 if (*qtblptr == NULL)
nuclear@14 92 *qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo);
nuclear@14 93 MEMCOPY((*qtblptr)->quantval,
nuclear@14 94 srcinfo->quant_tbl_ptrs[tblno]->quantval,
nuclear@14 95 SIZEOF((*qtblptr)->quantval));
nuclear@14 96 (*qtblptr)->sent_table = FALSE;
nuclear@14 97 }
nuclear@14 98 }
nuclear@14 99 /* Copy the source's per-component info.
nuclear@14 100 * Note we assume jpeg_set_defaults has allocated the dest comp_info array.
nuclear@14 101 */
nuclear@14 102 dstinfo->num_components = srcinfo->num_components;
nuclear@14 103 if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS)
nuclear@14 104 ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components,
nuclear@14 105 MAX_COMPONENTS);
nuclear@14 106 for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info;
nuclear@14 107 ci < dstinfo->num_components; ci++, incomp++, outcomp++) {
nuclear@14 108 outcomp->component_id = incomp->component_id;
nuclear@14 109 outcomp->h_samp_factor = incomp->h_samp_factor;
nuclear@14 110 outcomp->v_samp_factor = incomp->v_samp_factor;
nuclear@14 111 outcomp->quant_tbl_no = incomp->quant_tbl_no;
nuclear@14 112 /* Make sure saved quantization table for component matches the qtable
nuclear@14 113 * slot. If not, the input file re-used this qtable slot.
nuclear@14 114 * IJG encoder currently cannot duplicate this.
nuclear@14 115 */
nuclear@14 116 tblno = outcomp->quant_tbl_no;
nuclear@14 117 if (tblno < 0 || tblno >= NUM_QUANT_TBLS ||
nuclear@14 118 srcinfo->quant_tbl_ptrs[tblno] == NULL)
nuclear@14 119 ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno);
nuclear@14 120 slot_quant = srcinfo->quant_tbl_ptrs[tblno];
nuclear@14 121 c_quant = incomp->quant_table;
nuclear@14 122 if (c_quant != NULL) {
nuclear@14 123 for (coefi = 0; coefi < DCTSIZE2; coefi++) {
nuclear@14 124 if (c_quant->quantval[coefi] != slot_quant->quantval[coefi])
nuclear@14 125 ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno);
nuclear@14 126 }
nuclear@14 127 }
nuclear@14 128 /* Note: we do not copy the source's Huffman table assignments;
nuclear@14 129 * instead we rely on jpeg_set_colorspace to have made a suitable choice.
nuclear@14 130 */
nuclear@14 131 }
nuclear@14 132 /* Also copy JFIF version and resolution information, if available.
nuclear@14 133 * Strictly speaking this isn't "critical" info, but it's nearly
nuclear@14 134 * always appropriate to copy it if available. In particular,
nuclear@14 135 * if the application chooses to copy JFIF 1.02 extension markers from
nuclear@14 136 * the source file, we need to copy the version to make sure we don't
nuclear@14 137 * emit a file that has 1.02 extensions but a claimed version of 1.01.
nuclear@14 138 * We will *not*, however, copy version info from mislabeled "2.01" files.
nuclear@14 139 */
nuclear@14 140 if (srcinfo->saw_JFIF_marker) {
nuclear@14 141 if (srcinfo->JFIF_major_version == 1) {
nuclear@14 142 dstinfo->JFIF_major_version = srcinfo->JFIF_major_version;
nuclear@14 143 dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version;
nuclear@14 144 }
nuclear@14 145 dstinfo->density_unit = srcinfo->density_unit;
nuclear@14 146 dstinfo->X_density = srcinfo->X_density;
nuclear@14 147 dstinfo->Y_density = srcinfo->Y_density;
nuclear@14 148 }
nuclear@14 149 }
nuclear@14 150
nuclear@14 151
nuclear@14 152 /*
nuclear@14 153 * Master selection of compression modules for transcoding.
nuclear@14 154 * This substitutes for jcinit.c's initialization of the full compressor.
nuclear@14 155 */
nuclear@14 156
nuclear@14 157 LOCAL(void)
nuclear@14 158 transencode_master_selection (j_compress_ptr cinfo,
nuclear@14 159 jvirt_barray_ptr * coef_arrays)
nuclear@14 160 {
nuclear@14 161 /* Although we don't actually use input_components for transcoding,
nuclear@14 162 * jcmaster.c's initial_setup will complain if input_components is 0.
nuclear@14 163 */
nuclear@14 164 cinfo->input_components = 1;
nuclear@14 165 /* Initialize master control (includes parameter checking/processing) */
nuclear@14 166 jinit_c_master_control(cinfo, TRUE /* transcode only */);
nuclear@14 167
nuclear@14 168 /* Entropy encoding: either Huffman or arithmetic coding. */
nuclear@14 169 if (cinfo->arith_code) {
nuclear@14 170 ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
nuclear@14 171 } else {
nuclear@14 172 if (cinfo->progressive_mode) {
nuclear@14 173 #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@14 174 jinit_phuff_encoder(cinfo);
nuclear@14 175 #else
nuclear@14 176 ERREXIT(cinfo, JERR_NOT_COMPILED);
nuclear@14 177 #endif
nuclear@14 178 } else
nuclear@14 179 jinit_huff_encoder(cinfo);
nuclear@14 180 }
nuclear@14 181
nuclear@14 182 /* We need a special coefficient buffer controller. */
nuclear@14 183 transencode_coef_controller(cinfo, coef_arrays);
nuclear@14 184
nuclear@14 185 jinit_marker_writer(cinfo);
nuclear@14 186
nuclear@14 187 /* We can now tell the memory manager to allocate virtual arrays. */
nuclear@14 188 (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
nuclear@14 189
nuclear@14 190 /* Write the datastream header (SOI, JFIF) immediately.
nuclear@14 191 * Frame and scan headers are postponed till later.
nuclear@14 192 * This lets application insert special markers after the SOI.
nuclear@14 193 */
nuclear@14 194 (*cinfo->marker->write_file_header) (cinfo);
nuclear@14 195 }
nuclear@14 196
nuclear@14 197
nuclear@14 198 /*
nuclear@14 199 * The rest of this file is a special implementation of the coefficient
nuclear@14 200 * buffer controller. This is similar to jccoefct.c, but it handles only
nuclear@14 201 * output from presupplied virtual arrays. Furthermore, we generate any
nuclear@14 202 * dummy padding blocks on-the-fly rather than expecting them to be present
nuclear@14 203 * in the arrays.
nuclear@14 204 */
nuclear@14 205
nuclear@14 206 /* Private buffer controller object */
nuclear@14 207
nuclear@14 208 typedef struct {
nuclear@14 209 struct jpeg_c_coef_controller pub; /* public fields */
nuclear@14 210
nuclear@14 211 JDIMENSION iMCU_row_num; /* iMCU row # within image */
nuclear@14 212 JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
nuclear@14 213 int MCU_vert_offset; /* counts MCU rows within iMCU row */
nuclear@14 214 int MCU_rows_per_iMCU_row; /* number of such rows needed */
nuclear@14 215
nuclear@14 216 /* Virtual block array for each component. */
nuclear@14 217 jvirt_barray_ptr * whole_image;
nuclear@14 218
nuclear@14 219 /* Workspace for constructing dummy blocks at right/bottom edges. */
nuclear@14 220 JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU];
nuclear@14 221 } my_coef_controller;
nuclear@14 222
nuclear@14 223 typedef my_coef_controller * my_coef_ptr;
nuclear@14 224
nuclear@14 225
nuclear@14 226 LOCAL(void)
nuclear@14 227 start_iMCU_row (j_compress_ptr cinfo)
nuclear@14 228 /* Reset within-iMCU-row counters for a new row */
nuclear@14 229 {
nuclear@14 230 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 231
nuclear@14 232 /* In an interleaved scan, an MCU row is the same as an iMCU row.
nuclear@14 233 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
nuclear@14 234 * But at the bottom of the image, process only what's left.
nuclear@14 235 */
nuclear@14 236 if (cinfo->comps_in_scan > 1) {
nuclear@14 237 coef->MCU_rows_per_iMCU_row = 1;
nuclear@14 238 } else {
nuclear@14 239 if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
nuclear@14 240 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
nuclear@14 241 else
nuclear@14 242 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
nuclear@14 243 }
nuclear@14 244
nuclear@14 245 coef->mcu_ctr = 0;
nuclear@14 246 coef->MCU_vert_offset = 0;
nuclear@14 247 }
nuclear@14 248
nuclear@14 249
nuclear@14 250 /*
nuclear@14 251 * Initialize for a processing pass.
nuclear@14 252 */
nuclear@14 253
nuclear@14 254 METHODDEF(void)
nuclear@14 255 start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
nuclear@14 256 {
nuclear@14 257 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 258
nuclear@14 259 if (pass_mode != JBUF_CRANK_DEST)
nuclear@14 260 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 261
nuclear@14 262 coef->iMCU_row_num = 0;
nuclear@14 263 start_iMCU_row(cinfo);
nuclear@14 264 }
nuclear@14 265
nuclear@14 266
nuclear@14 267 /*
nuclear@14 268 * Process some data.
nuclear@14 269 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
nuclear@14 270 * per call, ie, v_samp_factor block rows for each component in the scan.
nuclear@14 271 * The data is obtained from the virtual arrays and fed to the entropy coder.
nuclear@14 272 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
nuclear@14 273 *
nuclear@14 274 * NB: input_buf is ignored; it is likely to be a NULL pointer.
nuclear@14 275 */
nuclear@14 276
nuclear@14 277 METHODDEF(boolean)
nuclear@14 278 compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
nuclear@14 279 {
nuclear@14 280 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 281 JDIMENSION MCU_col_num; /* index of current MCU within row */
nuclear@14 282 JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
nuclear@14 283 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
nuclear@14 284 int blkn, ci, xindex, yindex, yoffset, blockcnt;
nuclear@14 285 JDIMENSION start_col;
nuclear@14 286 JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
nuclear@14 287 JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
nuclear@14 288 JBLOCKROW buffer_ptr;
nuclear@14 289 jpeg_component_info *compptr;
nuclear@14 290
nuclear@14 291 /* Align the virtual buffers for the components used in this scan. */
nuclear@14 292 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
nuclear@14 293 compptr = cinfo->cur_comp_info[ci];
nuclear@14 294 buffer[ci] = (*cinfo->mem->access_virt_barray)
nuclear@14 295 ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
nuclear@14 296 coef->iMCU_row_num * compptr->v_samp_factor,
nuclear@14 297 (JDIMENSION) compptr->v_samp_factor, FALSE);
nuclear@14 298 }
nuclear@14 299
nuclear@14 300 /* Loop to process one whole iMCU row */
nuclear@14 301 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
nuclear@14 302 yoffset++) {
nuclear@14 303 for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
nuclear@14 304 MCU_col_num++) {
nuclear@14 305 /* Construct list of pointers to DCT blocks belonging to this MCU */
nuclear@14 306 blkn = 0; /* index of current DCT block within MCU */
nuclear@14 307 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
nuclear@14 308 compptr = cinfo->cur_comp_info[ci];
nuclear@14 309 start_col = MCU_col_num * compptr->MCU_width;
nuclear@14 310 blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
nuclear@14 311 : compptr->last_col_width;
nuclear@14 312 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
nuclear@14 313 if (coef->iMCU_row_num < last_iMCU_row ||
nuclear@14 314 yindex+yoffset < compptr->last_row_height) {
nuclear@14 315 /* Fill in pointers to real blocks in this row */
nuclear@14 316 buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
nuclear@14 317 for (xindex = 0; xindex < blockcnt; xindex++)
nuclear@14 318 MCU_buffer[blkn++] = buffer_ptr++;
nuclear@14 319 } else {
nuclear@14 320 /* At bottom of image, need a whole row of dummy blocks */
nuclear@14 321 xindex = 0;
nuclear@14 322 }
nuclear@14 323 /* Fill in any dummy blocks needed in this row.
nuclear@14 324 * Dummy blocks are filled in the same way as in jccoefct.c:
nuclear@14 325 * all zeroes in the AC entries, DC entries equal to previous
nuclear@14 326 * block's DC value. The init routine has already zeroed the
nuclear@14 327 * AC entries, so we need only set the DC entries correctly.
nuclear@14 328 */
nuclear@14 329 for (; xindex < compptr->MCU_width; xindex++) {
nuclear@14 330 MCU_buffer[blkn] = coef->dummy_buffer[blkn];
nuclear@14 331 MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0];
nuclear@14 332 blkn++;
nuclear@14 333 }
nuclear@14 334 }
nuclear@14 335 }
nuclear@14 336 /* Try to write the MCU. */
nuclear@14 337 if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) {
nuclear@14 338 /* Suspension forced; update state counters and exit */
nuclear@14 339 coef->MCU_vert_offset = yoffset;
nuclear@14 340 coef->mcu_ctr = MCU_col_num;
nuclear@14 341 return FALSE;
nuclear@14 342 }
nuclear@14 343 }
nuclear@14 344 /* Completed an MCU row, but perhaps not an iMCU row */
nuclear@14 345 coef->mcu_ctr = 0;
nuclear@14 346 }
nuclear@14 347 /* Completed the iMCU row, advance counters for next one */
nuclear@14 348 coef->iMCU_row_num++;
nuclear@14 349 start_iMCU_row(cinfo);
nuclear@14 350 return TRUE;
nuclear@14 351 }
nuclear@14 352
nuclear@14 353
nuclear@14 354 /*
nuclear@14 355 * Initialize coefficient buffer controller.
nuclear@14 356 *
nuclear@14 357 * Each passed coefficient array must be the right size for that
nuclear@14 358 * coefficient: width_in_blocks wide and height_in_blocks high,
nuclear@14 359 * with unitheight at least v_samp_factor.
nuclear@14 360 */
nuclear@14 361
nuclear@14 362 LOCAL(void)
nuclear@14 363 transencode_coef_controller (j_compress_ptr cinfo,
nuclear@14 364 jvirt_barray_ptr * coef_arrays)
nuclear@14 365 {
nuclear@14 366 my_coef_ptr coef;
nuclear@14 367 JBLOCKROW buffer;
nuclear@14 368 int i;
nuclear@14 369
nuclear@14 370 coef = (my_coef_ptr)
nuclear@14 371 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 372 SIZEOF(my_coef_controller));
nuclear@14 373 cinfo->coef = (struct jpeg_c_coef_controller *) coef;
nuclear@14 374 coef->pub.start_pass = start_pass_coef;
nuclear@14 375 coef->pub.compress_data = compress_output;
nuclear@14 376
nuclear@14 377 /* Save pointer to virtual arrays */
nuclear@14 378 coef->whole_image = coef_arrays;
nuclear@14 379
nuclear@14 380 /* Allocate and pre-zero space for dummy DCT blocks. */
nuclear@14 381 buffer = (JBLOCKROW)
nuclear@14 382 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 383 C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
nuclear@14 384 jzero_far((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
nuclear@14 385 for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
nuclear@14 386 coef->dummy_buffer[i] = buffer + i;
nuclear@14 387 }
nuclear@14 388 }