Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jcmainct.c |
| 3 | * |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 4 | * Copyright (C) 1994-1996, Thomas G. Lane. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 5 | * This file is part of the Independent JPEG Group's software. |
| 6 | * For conditions of distribution and use, see the accompanying README file. |
| 7 | * |
| 8 | * This file contains the main buffer controller for compression. |
| 9 | * The main buffer lies between the pre-processor and the JPEG |
| 10 | * compressor proper; it holds downsampled data in the JPEG colorspace. |
| 11 | */ |
| 12 | |
| 13 | #define JPEG_INTERNALS |
| 14 | #include "jinclude.h" |
| 15 | #include "jpeglib.h" |
| 16 | |
| 17 | |
| 18 | /* Note: currently, there is no operating mode in which a full-image buffer |
| 19 | * is needed at this step. If there were, that mode could not be used with |
| 20 | * "raw data" input, since this module is bypassed in that case. However, |
| 21 | * we've left the code here for possible use in special applications. |
| 22 | */ |
| 23 | #undef FULL_MAIN_BUFFER_SUPPORTED |
| 24 | |
| 25 | |
| 26 | /* Private buffer controller object */ |
| 27 | |
| 28 | typedef struct { |
| 29 | struct jpeg_c_main_controller pub; /* public fields */ |
| 30 | |
Thomas G. Lane | a8b67c4 | 1995-03-15 00:00:00 +0000 | [diff] [blame] | 31 | JDIMENSION cur_iMCU_row; /* number of current iMCU row */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 32 | JDIMENSION rowgroup_ctr; /* counts row groups received in iMCU row */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 33 | boolean suspended; /* remember if we suspended output */ |
| 34 | J_BUF_MODE pass_mode; /* current operating mode */ |
| 35 | |
| 36 | /* If using just a strip buffer, this points to the entire set of buffers |
| 37 | * (we allocate one for each component). In the full-image case, this |
| 38 | * points to the currently accessible strips of the virtual arrays. |
| 39 | */ |
| 40 | JSAMPARRAY buffer[MAX_COMPONENTS]; |
| 41 | |
| 42 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
| 43 | /* If using full-image storage, this array holds pointers to virtual-array |
| 44 | * control blocks for each component. Unused if not full-image storage. |
| 45 | */ |
| 46 | jvirt_sarray_ptr whole_image[MAX_COMPONENTS]; |
| 47 | #endif |
| 48 | } my_main_controller; |
| 49 | |
| 50 | typedef my_main_controller * my_main_ptr; |
| 51 | |
| 52 | |
| 53 | /* Forward declarations */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 54 | METHODDEF(void) process_data_simple_main |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 55 | JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf, |
| 56 | JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail)); |
| 57 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 58 | METHODDEF(void) process_data_buffer_main |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 59 | JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf, |
| 60 | JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail)); |
| 61 | #endif |
| 62 | |
| 63 | |
| 64 | /* |
| 65 | * Initialize for a processing pass. |
| 66 | */ |
| 67 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 68 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 69 | start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode) |
| 70 | { |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 71 | my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 72 | |
| 73 | /* Do nothing in raw-data mode. */ |
| 74 | if (cinfo->raw_data_in) |
| 75 | return; |
| 76 | |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 77 | main_ptr->cur_iMCU_row = 0; /* initialize counters */ |
| 78 | main_ptr->rowgroup_ctr = 0; |
| 79 | main_ptr->suspended = FALSE; |
| 80 | main_ptr->pass_mode = pass_mode; /* save mode for use by process_data */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 81 | |
| 82 | switch (pass_mode) { |
| 83 | case JBUF_PASS_THRU: |
| 84 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 85 | if (main_ptr->whole_image[0] != NULL) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 86 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
| 87 | #endif |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 88 | main_ptr->pub.process_data = process_data_simple_main; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 89 | break; |
| 90 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
| 91 | case JBUF_SAVE_SOURCE: |
| 92 | case JBUF_CRANK_DEST: |
| 93 | case JBUF_SAVE_AND_PASS: |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 94 | if (main_ptr->whole_image[0] == NULL) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 95 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 96 | main_ptr->pub.process_data = process_data_buffer_main; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 97 | break; |
| 98 | #endif |
| 99 | default: |
| 100 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | |
| 106 | /* |
| 107 | * Process some data. |
| 108 | * This routine handles the simple pass-through mode, |
| 109 | * where we have only a strip buffer. |
| 110 | */ |
| 111 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 112 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 113 | process_data_simple_main (j_compress_ptr cinfo, |
| 114 | JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, |
| 115 | JDIMENSION in_rows_avail) |
| 116 | { |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 117 | my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 118 | |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 119 | while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 120 | /* Read input data if we haven't filled the main buffer yet */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 121 | if (main_ptr->rowgroup_ctr < DCTSIZE) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 122 | (*cinfo->prep->pre_process_data) (cinfo, |
| 123 | input_buf, in_row_ctr, in_rows_avail, |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 124 | main_ptr->buffer, &main_ptr->rowgroup_ctr, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 125 | (JDIMENSION) DCTSIZE); |
| 126 | |
| 127 | /* If we don't have a full iMCU row buffered, return to application for |
| 128 | * more data. Note that preprocessor will always pad to fill the iMCU row |
| 129 | * at the bottom of the image. |
| 130 | */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 131 | if (main_ptr->rowgroup_ctr != DCTSIZE) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 132 | return; |
| 133 | |
| 134 | /* Send the completed row to the compressor */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 135 | if (! (*cinfo->coef->compress_data) (cinfo, main_ptr->buffer)) { |
Thomas G. Lane | a8b67c4 | 1995-03-15 00:00:00 +0000 | [diff] [blame] | 136 | /* If compressor did not consume the whole row, then we must need to |
| 137 | * suspend processing and return to the application. In this situation |
| 138 | * we pretend we didn't yet consume the last input row; otherwise, if |
| 139 | * it happened to be the last row of the image, the application would |
| 140 | * think we were done. |
| 141 | */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 142 | if (! main_ptr->suspended) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 143 | (*in_row_ctr)--; |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 144 | main_ptr->suspended = TRUE; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 145 | } |
| 146 | return; |
| 147 | } |
| 148 | /* We did finish the row. Undo our little suspension hack if a previous |
| 149 | * call suspended; then mark the main buffer empty. |
| 150 | */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 151 | if (main_ptr->suspended) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 152 | (*in_row_ctr)++; |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 153 | main_ptr->suspended = FALSE; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 154 | } |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 155 | main_ptr->rowgroup_ctr = 0; |
| 156 | main_ptr->cur_iMCU_row++; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 157 | } |
| 158 | } |
| 159 | |
| 160 | |
| 161 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
| 162 | |
| 163 | /* |
| 164 | * Process some data. |
| 165 | * This routine handles all of the modes that use a full-size buffer. |
| 166 | */ |
| 167 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 168 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 169 | process_data_buffer_main (j_compress_ptr cinfo, |
| 170 | JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, |
| 171 | JDIMENSION in_rows_avail) |
| 172 | { |
| 173 | my_main_ptr main = (my_main_ptr) cinfo->main; |
| 174 | int ci; |
| 175 | jpeg_component_info *compptr; |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 176 | boolean writing = (main_ptr->pass_mode != JBUF_CRANK_DEST); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 177 | |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 178 | while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 179 | /* Realign the virtual buffers if at the start of an iMCU row. */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 180 | if (main_ptr->rowgroup_ctr == 0) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 181 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 182 | ci++, compptr++) { |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 183 | main_ptr->buffer[ci] = (*cinfo->mem->access_virt_sarray) |
| 184 | ((j_common_ptr) cinfo, main_ptr->whole_image[ci], |
| 185 | main_ptr->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE), |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 186 | (JDIMENSION) (compptr->v_samp_factor * DCTSIZE), writing); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 187 | } |
| 188 | /* In a read pass, pretend we just read some source data. */ |
| 189 | if (! writing) { |
| 190 | *in_row_ctr += cinfo->max_v_samp_factor * DCTSIZE; |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 191 | main_ptr->rowgroup_ctr = DCTSIZE; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 192 | } |
| 193 | } |
| 194 | |
| 195 | /* If a write pass, read input data until the current iMCU row is full. */ |
| 196 | /* Note: preprocessor will pad if necessary to fill the last iMCU row. */ |
| 197 | if (writing) { |
| 198 | (*cinfo->prep->pre_process_data) (cinfo, |
| 199 | input_buf, in_row_ctr, in_rows_avail, |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 200 | main_ptr->buffer, &main_ptr->rowgroup_ctr, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 201 | (JDIMENSION) DCTSIZE); |
| 202 | /* Return to application if we need more data to fill the iMCU row. */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 203 | if (main_ptr->rowgroup_ctr < DCTSIZE) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 204 | return; |
| 205 | } |
| 206 | |
| 207 | /* Emit data, unless this is a sink-only pass. */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 208 | if (main_ptr->pass_mode != JBUF_SAVE_SOURCE) { |
| 209 | if (! (*cinfo->coef->compress_data) (cinfo, main_ptr->buffer)) { |
Thomas G. Lane | a8b67c4 | 1995-03-15 00:00:00 +0000 | [diff] [blame] | 210 | /* If compressor did not consume the whole row, then we must need to |
| 211 | * suspend processing and return to the application. In this situation |
| 212 | * we pretend we didn't yet consume the last input row; otherwise, if |
| 213 | * it happened to be the last row of the image, the application would |
| 214 | * think we were done. |
| 215 | */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 216 | if (! main_ptr->suspended) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 217 | (*in_row_ctr)--; |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 218 | main_ptr->suspended = TRUE; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 219 | } |
| 220 | return; |
| 221 | } |
| 222 | /* We did finish the row. Undo our little suspension hack if a previous |
| 223 | * call suspended; then mark the main buffer empty. |
| 224 | */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 225 | if (main_ptr->suspended) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 226 | (*in_row_ctr)++; |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 227 | main_ptr->suspended = FALSE; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 228 | } |
| 229 | } |
| 230 | |
| 231 | /* If get here, we are done with this iMCU row. Mark buffer empty. */ |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 232 | main_ptr->rowgroup_ctr = 0; |
| 233 | main_ptr->cur_iMCU_row++; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 234 | } |
| 235 | } |
| 236 | |
| 237 | #endif /* FULL_MAIN_BUFFER_SUPPORTED */ |
| 238 | |
| 239 | |
| 240 | /* |
| 241 | * Initialize main buffer controller. |
| 242 | */ |
| 243 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 244 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 245 | jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer) |
| 246 | { |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 247 | my_main_ptr main_ptr; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 248 | int ci; |
| 249 | jpeg_component_info *compptr; |
| 250 | |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 251 | main_ptr = (my_main_ptr) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 252 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 253 | SIZEOF(my_main_controller)); |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 254 | cinfo->main = (struct jpeg_c_main_controller *) main_ptr; |
| 255 | main_ptr->pub.start_pass = start_pass_main; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 256 | |
| 257 | /* We don't need to create a buffer in raw-data mode. */ |
| 258 | if (cinfo->raw_data_in) |
| 259 | return; |
| 260 | |
| 261 | /* Create the buffer. It holds downsampled data, so each component |
| 262 | * may be of a different size. |
| 263 | */ |
| 264 | if (need_full_buffer) { |
| 265 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
| 266 | /* Allocate a full-image virtual array for each component */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 267 | /* Note we pad the bottom to a multiple of the iMCU height */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 268 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 269 | ci++, compptr++) { |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 270 | main_ptr->whole_image[ci] = (*cinfo->mem->request_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 271 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 272 | compptr->width_in_blocks * DCTSIZE, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 273 | (JDIMENSION) jround_up((long) compptr->height_in_blocks, |
| 274 | (long) compptr->v_samp_factor) * DCTSIZE, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 275 | (JDIMENSION) (compptr->v_samp_factor * DCTSIZE)); |
| 276 | } |
| 277 | #else |
| 278 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
| 279 | #endif |
| 280 | } else { |
| 281 | #ifdef FULL_MAIN_BUFFER_SUPPORTED |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 282 | main_ptr->whole_image[0] = NULL; /* flag for no virtual arrays */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 283 | #endif |
| 284 | /* Allocate a strip buffer for each component */ |
| 285 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 286 | ci++, compptr++) { |
DRC | 7ed7b57 | 2012-02-07 22:51:49 +0000 | [diff] [blame^] | 287 | main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 288 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 289 | compptr->width_in_blocks * DCTSIZE, |
| 290 | (JDIMENSION) (compptr->v_samp_factor * DCTSIZE)); |
| 291 | } |
| 292 | } |
| 293 | } |