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annotate libs/libjpeg/jccoefct.c @ 14:06dc8b9b4f89

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
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rev   line source
nuclear@14 1 /*
nuclear@14 2 * jccoefct.c
nuclear@14 3 *
nuclear@14 4 * Copyright (C) 1994-1997, 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 the coefficient buffer controller for compression.
nuclear@14 9 * This controller is the top level of the JPEG compressor proper.
nuclear@14 10 * The coefficient buffer lies between forward-DCT and entropy encoding steps.
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 /* We use a full-image coefficient buffer when doing Huffman optimization,
nuclear@14 19 * and also for writing multiple-scan JPEG files. In all cases, the DCT
nuclear@14 20 * step is run during the first pass, and subsequent passes need only read
nuclear@14 21 * the buffered coefficients.
nuclear@14 22 */
nuclear@14 23 #ifdef ENTROPY_OPT_SUPPORTED
nuclear@14 24 #define FULL_COEF_BUFFER_SUPPORTED
nuclear@14 25 #else
nuclear@14 26 #ifdef C_MULTISCAN_FILES_SUPPORTED
nuclear@14 27 #define FULL_COEF_BUFFER_SUPPORTED
nuclear@14 28 #endif
nuclear@14 29 #endif
nuclear@14 30
nuclear@14 31
nuclear@14 32 /* Private buffer controller object */
nuclear@14 33
nuclear@14 34 typedef struct {
nuclear@14 35 struct jpeg_c_coef_controller pub; /* public fields */
nuclear@14 36
nuclear@14 37 JDIMENSION iMCU_row_num; /* iMCU row # within image */
nuclear@14 38 JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
nuclear@14 39 int MCU_vert_offset; /* counts MCU rows within iMCU row */
nuclear@14 40 int MCU_rows_per_iMCU_row; /* number of such rows needed */
nuclear@14 41
nuclear@14 42 /* For single-pass compression, it's sufficient to buffer just one MCU
nuclear@14 43 * (although this may prove a bit slow in practice). We allocate a
nuclear@14 44 * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each
nuclear@14 45 * MCU constructed and sent. (On 80x86, the workspace is FAR even though
nuclear@14 46 * it's not really very big; this is to keep the module interfaces unchanged
nuclear@14 47 * when a large coefficient buffer is necessary.)
nuclear@14 48 * In multi-pass modes, this array points to the current MCU's blocks
nuclear@14 49 * within the virtual arrays.
nuclear@14 50 */
nuclear@14 51 JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
nuclear@14 52
nuclear@14 53 /* In multi-pass modes, we need a virtual block array for each component. */
nuclear@14 54 jvirt_barray_ptr whole_image[MAX_COMPONENTS];
nuclear@14 55 } my_coef_controller;
nuclear@14 56
nuclear@14 57 typedef my_coef_controller * my_coef_ptr;
nuclear@14 58
nuclear@14 59
nuclear@14 60 /* Forward declarations */
nuclear@14 61 METHODDEF(boolean) compress_data
nuclear@14 62 JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
nuclear@14 63 #ifdef FULL_COEF_BUFFER_SUPPORTED
nuclear@14 64 METHODDEF(boolean) compress_first_pass
nuclear@14 65 JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
nuclear@14 66 METHODDEF(boolean) compress_output
nuclear@14 67 JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
nuclear@14 68 #endif
nuclear@14 69
nuclear@14 70
nuclear@14 71 LOCAL(void)
nuclear@14 72 start_iMCU_row (j_compress_ptr cinfo)
nuclear@14 73 /* Reset within-iMCU-row counters for a new row */
nuclear@14 74 {
nuclear@14 75 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 76
nuclear@14 77 /* In an interleaved scan, an MCU row is the same as an iMCU row.
nuclear@14 78 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
nuclear@14 79 * But at the bottom of the image, process only what's left.
nuclear@14 80 */
nuclear@14 81 if (cinfo->comps_in_scan > 1) {
nuclear@14 82 coef->MCU_rows_per_iMCU_row = 1;
nuclear@14 83 } else {
nuclear@14 84 if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
nuclear@14 85 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
nuclear@14 86 else
nuclear@14 87 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
nuclear@14 88 }
nuclear@14 89
nuclear@14 90 coef->mcu_ctr = 0;
nuclear@14 91 coef->MCU_vert_offset = 0;
nuclear@14 92 }
nuclear@14 93
nuclear@14 94
nuclear@14 95 /*
nuclear@14 96 * Initialize for a processing pass.
nuclear@14 97 */
nuclear@14 98
nuclear@14 99 METHODDEF(void)
nuclear@14 100 start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
nuclear@14 101 {
nuclear@14 102 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 103
nuclear@14 104 coef->iMCU_row_num = 0;
nuclear@14 105 start_iMCU_row(cinfo);
nuclear@14 106
nuclear@14 107 switch (pass_mode) {
nuclear@14 108 case JBUF_PASS_THRU:
nuclear@14 109 if (coef->whole_image[0] != NULL)
nuclear@14 110 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 111 coef->pub.compress_data = compress_data;
nuclear@14 112 break;
nuclear@14 113 #ifdef FULL_COEF_BUFFER_SUPPORTED
nuclear@14 114 case JBUF_SAVE_AND_PASS:
nuclear@14 115 if (coef->whole_image[0] == NULL)
nuclear@14 116 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 117 coef->pub.compress_data = compress_first_pass;
nuclear@14 118 break;
nuclear@14 119 case JBUF_CRANK_DEST:
nuclear@14 120 if (coef->whole_image[0] == NULL)
nuclear@14 121 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 122 coef->pub.compress_data = compress_output;
nuclear@14 123 break;
nuclear@14 124 #endif
nuclear@14 125 default:
nuclear@14 126 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 127 break;
nuclear@14 128 }
nuclear@14 129 }
nuclear@14 130
nuclear@14 131
nuclear@14 132 /*
nuclear@14 133 * Process some data in the single-pass case.
nuclear@14 134 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
nuclear@14 135 * per call, ie, v_samp_factor block rows for each component in the image.
nuclear@14 136 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
nuclear@14 137 *
nuclear@14 138 * NB: input_buf contains a plane for each component in image,
nuclear@14 139 * which we index according to the component's SOF position.
nuclear@14 140 */
nuclear@14 141
nuclear@14 142 METHODDEF(boolean)
nuclear@14 143 compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
nuclear@14 144 {
nuclear@14 145 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 146 JDIMENSION MCU_col_num; /* index of current MCU within row */
nuclear@14 147 JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
nuclear@14 148 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
nuclear@14 149 int blkn, bi, ci, yindex, yoffset, blockcnt;
nuclear@14 150 JDIMENSION ypos, xpos;
nuclear@14 151 jpeg_component_info *compptr;
nuclear@14 152
nuclear@14 153 /* Loop to write as much as one whole iMCU row */
nuclear@14 154 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
nuclear@14 155 yoffset++) {
nuclear@14 156 for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col;
nuclear@14 157 MCU_col_num++) {
nuclear@14 158 /* Determine where data comes from in input_buf and do the DCT thing.
nuclear@14 159 * Each call on forward_DCT processes a horizontal row of DCT blocks
nuclear@14 160 * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks
nuclear@14 161 * sequentially. Dummy blocks at the right or bottom edge are filled in
nuclear@14 162 * specially. The data in them does not matter for image reconstruction,
nuclear@14 163 * so we fill them with values that will encode to the smallest amount of
nuclear@14 164 * data, viz: all zeroes in the AC entries, DC entries equal to previous
nuclear@14 165 * block's DC value. (Thanks to Thomas Kinsman for this idea.)
nuclear@14 166 */
nuclear@14 167 blkn = 0;
nuclear@14 168 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
nuclear@14 169 compptr = cinfo->cur_comp_info[ci];
nuclear@14 170 blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
nuclear@14 171 : compptr->last_col_width;
nuclear@14 172 xpos = MCU_col_num * compptr->MCU_sample_width;
nuclear@14 173 ypos = yoffset * DCTSIZE; /* ypos == (yoffset+yindex) * DCTSIZE */
nuclear@14 174 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
nuclear@14 175 if (coef->iMCU_row_num < last_iMCU_row ||
nuclear@14 176 yoffset+yindex < compptr->last_row_height) {
nuclear@14 177 (*cinfo->fdct->forward_DCT) (cinfo, compptr,
nuclear@14 178 input_buf[compptr->component_index],
nuclear@14 179 coef->MCU_buffer[blkn],
nuclear@14 180 ypos, xpos, (JDIMENSION) blockcnt);
nuclear@14 181 if (blockcnt < compptr->MCU_width) {
nuclear@14 182 /* Create some dummy blocks at the right edge of the image. */
nuclear@14 183 jzero_far((void FAR *) coef->MCU_buffer[blkn + blockcnt],
nuclear@14 184 (compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK));
nuclear@14 185 for (bi = blockcnt; bi < compptr->MCU_width; bi++) {
nuclear@14 186 coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0];
nuclear@14 187 }
nuclear@14 188 }
nuclear@14 189 } else {
nuclear@14 190 /* Create a row of dummy blocks at the bottom of the image. */
nuclear@14 191 jzero_far((void FAR *) coef->MCU_buffer[blkn],
nuclear@14 192 compptr->MCU_width * SIZEOF(JBLOCK));
nuclear@14 193 for (bi = 0; bi < compptr->MCU_width; bi++) {
nuclear@14 194 coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0];
nuclear@14 195 }
nuclear@14 196 }
nuclear@14 197 blkn += compptr->MCU_width;
nuclear@14 198 ypos += DCTSIZE;
nuclear@14 199 }
nuclear@14 200 }
nuclear@14 201 /* Try to write the MCU. In event of a suspension failure, we will
nuclear@14 202 * re-DCT the MCU on restart (a bit inefficient, could be fixed...)
nuclear@14 203 */
nuclear@14 204 if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
nuclear@14 205 /* Suspension forced; update state counters and exit */
nuclear@14 206 coef->MCU_vert_offset = yoffset;
nuclear@14 207 coef->mcu_ctr = MCU_col_num;
nuclear@14 208 return FALSE;
nuclear@14 209 }
nuclear@14 210 }
nuclear@14 211 /* Completed an MCU row, but perhaps not an iMCU row */
nuclear@14 212 coef->mcu_ctr = 0;
nuclear@14 213 }
nuclear@14 214 /* Completed the iMCU row, advance counters for next one */
nuclear@14 215 coef->iMCU_row_num++;
nuclear@14 216 start_iMCU_row(cinfo);
nuclear@14 217 return TRUE;
nuclear@14 218 }
nuclear@14 219
nuclear@14 220
nuclear@14 221 #ifdef FULL_COEF_BUFFER_SUPPORTED
nuclear@14 222
nuclear@14 223 /*
nuclear@14 224 * Process some data in the first pass of a multi-pass case.
nuclear@14 225 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
nuclear@14 226 * per call, ie, v_samp_factor block rows for each component in the image.
nuclear@14 227 * This amount of data is read from the source buffer, DCT'd and quantized,
nuclear@14 228 * and saved into the virtual arrays. We also generate suitable dummy blocks
nuclear@14 229 * as needed at the right and lower edges. (The dummy blocks are constructed
nuclear@14 230 * in the virtual arrays, which have been padded appropriately.) This makes
nuclear@14 231 * it possible for subsequent passes not to worry about real vs. dummy blocks.
nuclear@14 232 *
nuclear@14 233 * We must also emit the data to the entropy encoder. This is conveniently
nuclear@14 234 * done by calling compress_output() after we've loaded the current strip
nuclear@14 235 * of the virtual arrays.
nuclear@14 236 *
nuclear@14 237 * NB: input_buf contains a plane for each component in image. All
nuclear@14 238 * components are DCT'd and loaded into the virtual arrays in this pass.
nuclear@14 239 * However, it may be that only a subset of the components are emitted to
nuclear@14 240 * the entropy encoder during this first pass; be careful about looking
nuclear@14 241 * at the scan-dependent variables (MCU dimensions, etc).
nuclear@14 242 */
nuclear@14 243
nuclear@14 244 METHODDEF(boolean)
nuclear@14 245 compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
nuclear@14 246 {
nuclear@14 247 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 248 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
nuclear@14 249 JDIMENSION blocks_across, MCUs_across, MCUindex;
nuclear@14 250 int bi, ci, h_samp_factor, block_row, block_rows, ndummy;
nuclear@14 251 JCOEF lastDC;
nuclear@14 252 jpeg_component_info *compptr;
nuclear@14 253 JBLOCKARRAY buffer;
nuclear@14 254 JBLOCKROW thisblockrow, lastblockrow;
nuclear@14 255
nuclear@14 256 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@14 257 ci++, compptr++) {
nuclear@14 258 /* Align the virtual buffer for this component. */
nuclear@14 259 buffer = (*cinfo->mem->access_virt_barray)
nuclear@14 260 ((j_common_ptr) cinfo, coef->whole_image[ci],
nuclear@14 261 coef->iMCU_row_num * compptr->v_samp_factor,
nuclear@14 262 (JDIMENSION) compptr->v_samp_factor, TRUE);
nuclear@14 263 /* Count non-dummy DCT block rows in this iMCU row. */
nuclear@14 264 if (coef->iMCU_row_num < last_iMCU_row)
nuclear@14 265 block_rows = compptr->v_samp_factor;
nuclear@14 266 else {
nuclear@14 267 /* NB: can't use last_row_height here, since may not be set! */
nuclear@14 268 block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
nuclear@14 269 if (block_rows == 0) block_rows = compptr->v_samp_factor;
nuclear@14 270 }
nuclear@14 271 blocks_across = compptr->width_in_blocks;
nuclear@14 272 h_samp_factor = compptr->h_samp_factor;
nuclear@14 273 /* Count number of dummy blocks to be added at the right margin. */
nuclear@14 274 ndummy = (int) (blocks_across % h_samp_factor);
nuclear@14 275 if (ndummy > 0)
nuclear@14 276 ndummy = h_samp_factor - ndummy;
nuclear@14 277 /* Perform DCT for all non-dummy blocks in this iMCU row. Each call
nuclear@14 278 * on forward_DCT processes a complete horizontal row of DCT blocks.
nuclear@14 279 */
nuclear@14 280 for (block_row = 0; block_row < block_rows; block_row++) {
nuclear@14 281 thisblockrow = buffer[block_row];
nuclear@14 282 (*cinfo->fdct->forward_DCT) (cinfo, compptr,
nuclear@14 283 input_buf[ci], thisblockrow,
nuclear@14 284 (JDIMENSION) (block_row * DCTSIZE),
nuclear@14 285 (JDIMENSION) 0, blocks_across);
nuclear@14 286 if (ndummy > 0) {
nuclear@14 287 /* Create dummy blocks at the right edge of the image. */
nuclear@14 288 thisblockrow += blocks_across; /* => first dummy block */
nuclear@14 289 jzero_far((void FAR *) thisblockrow, ndummy * SIZEOF(JBLOCK));
nuclear@14 290 lastDC = thisblockrow[-1][0];
nuclear@14 291 for (bi = 0; bi < ndummy; bi++) {
nuclear@14 292 thisblockrow[bi][0] = lastDC;
nuclear@14 293 }
nuclear@14 294 }
nuclear@14 295 }
nuclear@14 296 /* If at end of image, create dummy block rows as needed.
nuclear@14 297 * The tricky part here is that within each MCU, we want the DC values
nuclear@14 298 * of the dummy blocks to match the last real block's DC value.
nuclear@14 299 * This squeezes a few more bytes out of the resulting file...
nuclear@14 300 */
nuclear@14 301 if (coef->iMCU_row_num == last_iMCU_row) {
nuclear@14 302 blocks_across += ndummy; /* include lower right corner */
nuclear@14 303 MCUs_across = blocks_across / h_samp_factor;
nuclear@14 304 for (block_row = block_rows; block_row < compptr->v_samp_factor;
nuclear@14 305 block_row++) {
nuclear@14 306 thisblockrow = buffer[block_row];
nuclear@14 307 lastblockrow = buffer[block_row-1];
nuclear@14 308 jzero_far((void FAR *) thisblockrow,
nuclear@14 309 (size_t) (blocks_across * SIZEOF(JBLOCK)));
nuclear@14 310 for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) {
nuclear@14 311 lastDC = lastblockrow[h_samp_factor-1][0];
nuclear@14 312 for (bi = 0; bi < h_samp_factor; bi++) {
nuclear@14 313 thisblockrow[bi][0] = lastDC;
nuclear@14 314 }
nuclear@14 315 thisblockrow += h_samp_factor; /* advance to next MCU in row */
nuclear@14 316 lastblockrow += h_samp_factor;
nuclear@14 317 }
nuclear@14 318 }
nuclear@14 319 }
nuclear@14 320 }
nuclear@14 321 /* NB: compress_output will increment iMCU_row_num if successful.
nuclear@14 322 * A suspension return will result in redoing all the work above next time.
nuclear@14 323 */
nuclear@14 324
nuclear@14 325 /* Emit data to the entropy encoder, sharing code with subsequent passes */
nuclear@14 326 return compress_output(cinfo, input_buf);
nuclear@14 327 }
nuclear@14 328
nuclear@14 329
nuclear@14 330 /*
nuclear@14 331 * Process some data in subsequent passes of a multi-pass case.
nuclear@14 332 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
nuclear@14 333 * per call, ie, v_samp_factor block rows for each component in the scan.
nuclear@14 334 * The data is obtained from the virtual arrays and fed to the entropy coder.
nuclear@14 335 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
nuclear@14 336 *
nuclear@14 337 * NB: input_buf is ignored; it is likely to be a NULL pointer.
nuclear@14 338 */
nuclear@14 339
nuclear@14 340 METHODDEF(boolean)
nuclear@14 341 compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
nuclear@14 342 {
nuclear@14 343 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
nuclear@14 344 JDIMENSION MCU_col_num; /* index of current MCU within row */
nuclear@14 345 int blkn, ci, xindex, yindex, yoffset;
nuclear@14 346 JDIMENSION start_col;
nuclear@14 347 JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
nuclear@14 348 JBLOCKROW buffer_ptr;
nuclear@14 349 jpeg_component_info *compptr;
nuclear@14 350
nuclear@14 351 /* Align the virtual buffers for the components used in this scan.
nuclear@14 352 * NB: during first pass, this is safe only because the buffers will
nuclear@14 353 * already be aligned properly, so jmemmgr.c won't need to do any I/O.
nuclear@14 354 */
nuclear@14 355 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
nuclear@14 356 compptr = cinfo->cur_comp_info[ci];
nuclear@14 357 buffer[ci] = (*cinfo->mem->access_virt_barray)
nuclear@14 358 ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
nuclear@14 359 coef->iMCU_row_num * compptr->v_samp_factor,
nuclear@14 360 (JDIMENSION) compptr->v_samp_factor, FALSE);
nuclear@14 361 }
nuclear@14 362
nuclear@14 363 /* Loop to process one whole iMCU row */
nuclear@14 364 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
nuclear@14 365 yoffset++) {
nuclear@14 366 for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
nuclear@14 367 MCU_col_num++) {
nuclear@14 368 /* Construct list of pointers to DCT blocks belonging to this MCU */
nuclear@14 369 blkn = 0; /* index of current DCT block within MCU */
nuclear@14 370 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
nuclear@14 371 compptr = cinfo->cur_comp_info[ci];
nuclear@14 372 start_col = MCU_col_num * compptr->MCU_width;
nuclear@14 373 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
nuclear@14 374 buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
nuclear@14 375 for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
nuclear@14 376 coef->MCU_buffer[blkn++] = buffer_ptr++;
nuclear@14 377 }
nuclear@14 378 }
nuclear@14 379 }
nuclear@14 380 /* Try to write the MCU. */
nuclear@14 381 if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
nuclear@14 382 /* Suspension forced; update state counters and exit */
nuclear@14 383 coef->MCU_vert_offset = yoffset;
nuclear@14 384 coef->mcu_ctr = MCU_col_num;
nuclear@14 385 return FALSE;
nuclear@14 386 }
nuclear@14 387 }
nuclear@14 388 /* Completed an MCU row, but perhaps not an iMCU row */
nuclear@14 389 coef->mcu_ctr = 0;
nuclear@14 390 }
nuclear@14 391 /* Completed the iMCU row, advance counters for next one */
nuclear@14 392 coef->iMCU_row_num++;
nuclear@14 393 start_iMCU_row(cinfo);
nuclear@14 394 return TRUE;
nuclear@14 395 }
nuclear@14 396
nuclear@14 397 #endif /* FULL_COEF_BUFFER_SUPPORTED */
nuclear@14 398
nuclear@14 399
nuclear@14 400 /*
nuclear@14 401 * Initialize coefficient buffer controller.
nuclear@14 402 */
nuclear@14 403
nuclear@14 404 GLOBAL(void)
nuclear@14 405 jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
nuclear@14 406 {
nuclear@14 407 my_coef_ptr coef;
nuclear@14 408
nuclear@14 409 coef = (my_coef_ptr)
nuclear@14 410 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 411 SIZEOF(my_coef_controller));
nuclear@14 412 cinfo->coef = (struct jpeg_c_coef_controller *) coef;
nuclear@14 413 coef->pub.start_pass = start_pass_coef;
nuclear@14 414
nuclear@14 415 /* Create the coefficient buffer. */
nuclear@14 416 if (need_full_buffer) {
nuclear@14 417 #ifdef FULL_COEF_BUFFER_SUPPORTED
nuclear@14 418 /* Allocate a full-image virtual array for each component, */
nuclear@14 419 /* padded to a multiple of samp_factor DCT blocks in each direction. */
nuclear@14 420 int ci;
nuclear@14 421 jpeg_component_info *compptr;
nuclear@14 422
nuclear@14 423 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@14 424 ci++, compptr++) {
nuclear@14 425 coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
nuclear@14 426 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
nuclear@14 427 (JDIMENSION) jround_up((long) compptr->width_in_blocks,
nuclear@14 428 (long) compptr->h_samp_factor),
nuclear@14 429 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
nuclear@14 430 (long) compptr->v_samp_factor),
nuclear@14 431 (JDIMENSION) compptr->v_samp_factor);
nuclear@14 432 }
nuclear@14 433 #else
nuclear@14 434 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@14 435 #endif
nuclear@14 436 } else {
nuclear@14 437 /* We only need a single-MCU buffer. */
nuclear@14 438 JBLOCKROW buffer;
nuclear@14 439 int i;
nuclear@14 440
nuclear@14 441 buffer = (JBLOCKROW)
nuclear@14 442 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 443 C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
nuclear@14 444 for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
nuclear@14 445 coef->MCU_buffer[i] = buffer + i;
nuclear@14 446 }
nuclear@14 447 coef->whole_image[0] = NULL; /* flag for no virtual arrays */
nuclear@14 448 }
nuclear@14 449 }