blob: c583d7d6e83633525063e53f7979576cd2b2f970 [file] [log] [blame]
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +00001/*
2 * jccoefct.c
3 *
DRC5033f3e2014-05-18 18:33:44 +00004 * This file was part of the Independent JPEG Group's software:
Thomas G. Lane5ead57a1998-03-27 00:00:00 +00005 * Copyright (C) 1994-1997, Thomas G. Lane.
DRC5033f3e2014-05-18 18:33:44 +00006 * It was modified by The libjpeg-turbo Project to include only code and
7 * information relevant to libjpeg-turbo.
DRC7e3acc02015-10-10 10:25:46 -05008 * For conditions of distribution and use, see the accompanying README.ijg
9 * file.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000010 *
11 * This file contains the coefficient buffer controller for compression.
12 * This controller is the top level of the JPEG compressor proper.
13 * The coefficient buffer lies between forward-DCT and entropy encoding steps.
14 */
15
16#define JPEG_INTERNALS
17#include "jinclude.h"
18#include "jpeglib.h"
19
20
21/* We use a full-image coefficient buffer when doing Huffman optimization,
22 * and also for writing multiple-scan JPEG files. In all cases, the DCT
23 * step is run during the first pass, and subsequent passes need only read
24 * the buffered coefficients.
25 */
26#ifdef ENTROPY_OPT_SUPPORTED
27#define FULL_COEF_BUFFER_SUPPORTED
28#else
29#ifdef C_MULTISCAN_FILES_SUPPORTED
30#define FULL_COEF_BUFFER_SUPPORTED
31#endif
32#endif
33
34
35/* Private buffer controller object */
36
37typedef struct {
38 struct jpeg_c_coef_controller pub; /* public fields */
39
DRCe5eaf372014-05-09 18:00:32 +000040 JDIMENSION iMCU_row_num; /* iMCU row # within image */
41 JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
42 int MCU_vert_offset; /* counts MCU rows within iMCU row */
43 int MCU_rows_per_iMCU_row; /* number of such rows needed */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000044
45 /* For single-pass compression, it's sufficient to buffer just one MCU
46 * (although this may prove a bit slow in practice). We allocate a
Thomas G. Lanebc79e061995-08-02 00:00:00 +000047 * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each
DRC5033f3e2014-05-18 18:33:44 +000048 * MCU constructed and sent. In multi-pass modes, this array points to the
49 * current MCU's blocks within the virtual arrays.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000050 */
Thomas G. Lanebc79e061995-08-02 00:00:00 +000051 JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000052
53 /* In multi-pass modes, we need a virtual block array for each component. */
54 jvirt_barray_ptr whole_image[MAX_COMPONENTS];
55} my_coef_controller;
56
57typedef my_coef_controller * my_coef_ptr;
58
59
60/* Forward declarations */
Thomas G. Lane489583f1996-02-07 00:00:00 +000061METHODDEF(boolean) compress_data
DRCbc56b752014-05-16 10:43:44 +000062 (j_compress_ptr cinfo, JSAMPIMAGE input_buf);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000063#ifdef FULL_COEF_BUFFER_SUPPORTED
Thomas G. Lane489583f1996-02-07 00:00:00 +000064METHODDEF(boolean) compress_first_pass
DRCbc56b752014-05-16 10:43:44 +000065 (j_compress_ptr cinfo, JSAMPIMAGE input_buf);
Thomas G. Lane489583f1996-02-07 00:00:00 +000066METHODDEF(boolean) compress_output
DRCbc56b752014-05-16 10:43:44 +000067 (j_compress_ptr cinfo, JSAMPIMAGE input_buf);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000068#endif
69
70
Thomas G. Lane489583f1996-02-07 00:00:00 +000071LOCAL(void)
Thomas G. Lanea8b67c41995-03-15 00:00:00 +000072start_iMCU_row (j_compress_ptr cinfo)
73/* Reset within-iMCU-row counters for a new row */
74{
75 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
76
77 /* In an interleaved scan, an MCU row is the same as an iMCU row.
78 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
79 * But at the bottom of the image, process only what's left.
80 */
81 if (cinfo->comps_in_scan > 1) {
82 coef->MCU_rows_per_iMCU_row = 1;
83 } else {
84 if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
85 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
86 else
87 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
88 }
89
90 coef->mcu_ctr = 0;
91 coef->MCU_vert_offset = 0;
92}
93
94
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000095/*
96 * Initialize for a processing pass.
97 */
98
Thomas G. Lane489583f1996-02-07 00:00:00 +000099METHODDEF(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000100start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
101{
102 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
103
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000104 coef->iMCU_row_num = 0;
105 start_iMCU_row(cinfo);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000106
107 switch (pass_mode) {
108 case JBUF_PASS_THRU:
109 if (coef->whole_image[0] != NULL)
110 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
111 coef->pub.compress_data = compress_data;
112 break;
113#ifdef FULL_COEF_BUFFER_SUPPORTED
114 case JBUF_SAVE_AND_PASS:
115 if (coef->whole_image[0] == NULL)
116 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
117 coef->pub.compress_data = compress_first_pass;
118 break;
119 case JBUF_CRANK_DEST:
120 if (coef->whole_image[0] == NULL)
121 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
122 coef->pub.compress_data = compress_output;
123 break;
124#endif
125 default:
126 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
127 break;
128 }
129}
130
131
132/*
133 * Process some data in the single-pass case.
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000134 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
135 * per call, ie, v_samp_factor block rows for each component in the image.
136 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000137 *
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000138 * NB: input_buf contains a plane for each component in image,
139 * which we index according to the component's SOF position.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000140 */
141
Thomas G. Lane489583f1996-02-07 00:00:00 +0000142METHODDEF(boolean)
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000143compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000144{
145 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
DRCe5eaf372014-05-09 18:00:32 +0000146 JDIMENSION MCU_col_num; /* index of current MCU within row */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000147 JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000148 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
149 int blkn, bi, ci, yindex, yoffset, blockcnt;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000150 JDIMENSION ypos, xpos;
151 jpeg_component_info *compptr;
152
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000153 /* Loop to write as much as one whole iMCU row */
154 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
155 yoffset++) {
156 for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col;
DRCe5eaf372014-05-09 18:00:32 +0000157 MCU_col_num++) {
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000158 /* Determine where data comes from in input_buf and do the DCT thing.
159 * Each call on forward_DCT processes a horizontal row of DCT blocks
160 * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks
161 * sequentially. Dummy blocks at the right or bottom edge are filled in
162 * specially. The data in them does not matter for image reconstruction,
163 * so we fill them with values that will encode to the smallest amount of
164 * data, viz: all zeroes in the AC entries, DC entries equal to previous
165 * block's DC value. (Thanks to Thomas Kinsman for this idea.)
166 */
167 blkn = 0;
168 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
DRCe5eaf372014-05-09 18:00:32 +0000169 compptr = cinfo->cur_comp_info[ci];
170 blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
171 : compptr->last_col_width;
172 xpos = MCU_col_num * compptr->MCU_sample_width;
173 ypos = yoffset * DCTSIZE; /* ypos == (yoffset+yindex) * DCTSIZE */
174 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
175 if (coef->iMCU_row_num < last_iMCU_row ||
176 yoffset+yindex < compptr->last_row_height) {
177 (*cinfo->fdct->forward_DCT) (cinfo, compptr,
178 input_buf[compptr->component_index],
179 coef->MCU_buffer[blkn],
180 ypos, xpos, (JDIMENSION) blockcnt);
181 if (blockcnt < compptr->MCU_width) {
182 /* Create some dummy blocks at the right edge of the image. */
DRC5033f3e2014-05-18 18:33:44 +0000183 jzero_far((void *) coef->MCU_buffer[blkn + blockcnt],
DRC5de454b2014-05-18 19:04:03 +0000184 (compptr->MCU_width - blockcnt) * sizeof(JBLOCK));
DRCe5eaf372014-05-09 18:00:32 +0000185 for (bi = blockcnt; bi < compptr->MCU_width; bi++) {
186 coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0];
187 }
188 }
189 } else {
190 /* Create a row of dummy blocks at the bottom of the image. */
DRC5033f3e2014-05-18 18:33:44 +0000191 jzero_far((void *) coef->MCU_buffer[blkn],
DRC5de454b2014-05-18 19:04:03 +0000192 compptr->MCU_width * sizeof(JBLOCK));
DRCe5eaf372014-05-09 18:00:32 +0000193 for (bi = 0; bi < compptr->MCU_width; bi++) {
194 coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0];
195 }
196 }
197 blkn += compptr->MCU_width;
198 ypos += DCTSIZE;
199 }
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000200 }
201 /* Try to write the MCU. In event of a suspension failure, we will
202 * re-DCT the MCU on restart (a bit inefficient, could be fixed...)
203 */
204 if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
DRCe5eaf372014-05-09 18:00:32 +0000205 /* Suspension forced; update state counters and exit */
206 coef->MCU_vert_offset = yoffset;
207 coef->mcu_ctr = MCU_col_num;
208 return FALSE;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000209 }
210 }
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000211 /* Completed an MCU row, but perhaps not an iMCU row */
212 coef->mcu_ctr = 0;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000213 }
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000214 /* Completed the iMCU row, advance counters for next one */
215 coef->iMCU_row_num++;
216 start_iMCU_row(cinfo);
217 return TRUE;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000218}
219
220
221#ifdef FULL_COEF_BUFFER_SUPPORTED
222
223/*
224 * Process some data in the first pass of a multi-pass case.
225 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
226 * per call, ie, v_samp_factor block rows for each component in the image.
227 * This amount of data is read from the source buffer, DCT'd and quantized,
228 * and saved into the virtual arrays. We also generate suitable dummy blocks
229 * as needed at the right and lower edges. (The dummy blocks are constructed
230 * in the virtual arrays, which have been padded appropriately.) This makes
231 * it possible for subsequent passes not to worry about real vs. dummy blocks.
232 *
233 * We must also emit the data to the entropy encoder. This is conveniently
234 * done by calling compress_output() after we've loaded the current strip
235 * of the virtual arrays.
236 *
237 * NB: input_buf contains a plane for each component in image. All
238 * components are DCT'd and loaded into the virtual arrays in this pass.
239 * However, it may be that only a subset of the components are emitted to
240 * the entropy encoder during this first pass; be careful about looking
241 * at the scan-dependent variables (MCU dimensions, etc).
242 */
243
Thomas G. Lane489583f1996-02-07 00:00:00 +0000244METHODDEF(boolean)
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000245compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000246{
247 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000248 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000249 JDIMENSION blocks_across, MCUs_across, MCUindex;
250 int bi, ci, h_samp_factor, block_row, block_rows, ndummy;
251 JCOEF lastDC;
252 jpeg_component_info *compptr;
253 JBLOCKARRAY buffer;
254 JBLOCKROW thisblockrow, lastblockrow;
255
256 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
257 ci++, compptr++) {
258 /* Align the virtual buffer for this component. */
259 buffer = (*cinfo->mem->access_virt_barray)
260 ((j_common_ptr) cinfo, coef->whole_image[ci],
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000261 coef->iMCU_row_num * compptr->v_samp_factor,
262 (JDIMENSION) compptr->v_samp_factor, TRUE);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000263 /* Count non-dummy DCT block rows in this iMCU row. */
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000264 if (coef->iMCU_row_num < last_iMCU_row)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000265 block_rows = compptr->v_samp_factor;
266 else {
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000267 /* NB: can't use last_row_height here, since may not be set! */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000268 block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
269 if (block_rows == 0) block_rows = compptr->v_samp_factor;
270 }
271 blocks_across = compptr->width_in_blocks;
272 h_samp_factor = compptr->h_samp_factor;
273 /* Count number of dummy blocks to be added at the right margin. */
274 ndummy = (int) (blocks_across % h_samp_factor);
275 if (ndummy > 0)
276 ndummy = h_samp_factor - ndummy;
277 /* Perform DCT for all non-dummy blocks in this iMCU row. Each call
278 * on forward_DCT processes a complete horizontal row of DCT blocks.
279 */
280 for (block_row = 0; block_row < block_rows; block_row++) {
281 thisblockrow = buffer[block_row];
282 (*cinfo->fdct->forward_DCT) (cinfo, compptr,
DRCe5eaf372014-05-09 18:00:32 +0000283 input_buf[ci], thisblockrow,
284 (JDIMENSION) (block_row * DCTSIZE),
285 (JDIMENSION) 0, blocks_across);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000286 if (ndummy > 0) {
DRCe5eaf372014-05-09 18:00:32 +0000287 /* Create dummy blocks at the right edge of the image. */
288 thisblockrow += blocks_across; /* => first dummy block */
DRC5de454b2014-05-18 19:04:03 +0000289 jzero_far((void *) thisblockrow, ndummy * sizeof(JBLOCK));
DRCe5eaf372014-05-09 18:00:32 +0000290 lastDC = thisblockrow[-1][0];
291 for (bi = 0; bi < ndummy; bi++) {
292 thisblockrow[bi][0] = lastDC;
293 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000294 }
295 }
296 /* If at end of image, create dummy block rows as needed.
297 * The tricky part here is that within each MCU, we want the DC values
298 * of the dummy blocks to match the last real block's DC value.
299 * This squeezes a few more bytes out of the resulting file...
300 */
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000301 if (coef->iMCU_row_num == last_iMCU_row) {
DRCe5eaf372014-05-09 18:00:32 +0000302 blocks_across += ndummy; /* include lower right corner */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000303 MCUs_across = blocks_across / h_samp_factor;
304 for (block_row = block_rows; block_row < compptr->v_samp_factor;
DRCe5eaf372014-05-09 18:00:32 +0000305 block_row++) {
306 thisblockrow = buffer[block_row];
307 lastblockrow = buffer[block_row-1];
DRC5033f3e2014-05-18 18:33:44 +0000308 jzero_far((void *) thisblockrow,
DRC5de454b2014-05-18 19:04:03 +0000309 (size_t) (blocks_across * sizeof(JBLOCK)));
DRCe5eaf372014-05-09 18:00:32 +0000310 for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) {
311 lastDC = lastblockrow[h_samp_factor-1][0];
312 for (bi = 0; bi < h_samp_factor; bi++) {
313 thisblockrow[bi][0] = lastDC;
314 }
315 thisblockrow += h_samp_factor; /* advance to next MCU in row */
316 lastblockrow += h_samp_factor;
317 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000318 }
319 }
320 }
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000321 /* NB: compress_output will increment iMCU_row_num if successful.
322 * A suspension return will result in redoing all the work above next time.
323 */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000324
325 /* Emit data to the entropy encoder, sharing code with subsequent passes */
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000326 return compress_output(cinfo, input_buf);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000327}
328
329
330/*
331 * Process some data in subsequent passes of a multi-pass case.
332 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
333 * per call, ie, v_samp_factor block rows for each component in the scan.
334 * The data is obtained from the virtual arrays and fed to the entropy coder.
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000335 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000336 *
337 * NB: input_buf is ignored; it is likely to be a NULL pointer.
338 */
339
Thomas G. Lane489583f1996-02-07 00:00:00 +0000340METHODDEF(boolean)
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000341compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000342{
343 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
DRCe5eaf372014-05-09 18:00:32 +0000344 JDIMENSION MCU_col_num; /* index of current MCU within row */
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000345 int blkn, ci, xindex, yindex, yoffset;
346 JDIMENSION start_col;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000347 JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
348 JBLOCKROW buffer_ptr;
349 jpeg_component_info *compptr;
350
351 /* Align the virtual buffers for the components used in this scan.
352 * NB: during first pass, this is safe only because the buffers will
353 * already be aligned properly, so jmemmgr.c won't need to do any I/O.
354 */
355 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
356 compptr = cinfo->cur_comp_info[ci];
357 buffer[ci] = (*cinfo->mem->access_virt_barray)
358 ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000359 coef->iMCU_row_num * compptr->v_samp_factor,
360 (JDIMENSION) compptr->v_samp_factor, FALSE);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000361 }
362
363 /* Loop to process one whole iMCU row */
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000364 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
365 yoffset++) {
366 for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
DRCe5eaf372014-05-09 18:00:32 +0000367 MCU_col_num++) {
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000368 /* Construct list of pointers to DCT blocks belonging to this MCU */
DRCe5eaf372014-05-09 18:00:32 +0000369 blkn = 0; /* index of current DCT block within MCU */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000370 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
DRCe5eaf372014-05-09 18:00:32 +0000371 compptr = cinfo->cur_comp_info[ci];
372 start_col = MCU_col_num * compptr->MCU_width;
373 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
374 buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
375 for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
376 coef->MCU_buffer[blkn++] = buffer_ptr++;
377 }
378 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000379 }
380 /* Try to write the MCU. */
381 if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
DRCe5eaf372014-05-09 18:00:32 +0000382 /* Suspension forced; update state counters and exit */
383 coef->MCU_vert_offset = yoffset;
384 coef->mcu_ctr = MCU_col_num;
385 return FALSE;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000386 }
387 }
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000388 /* Completed an MCU row, but perhaps not an iMCU row */
389 coef->mcu_ctr = 0;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000390 }
Thomas G. Lanea8b67c41995-03-15 00:00:00 +0000391 /* Completed the iMCU row, advance counters for next one */
392 coef->iMCU_row_num++;
393 start_iMCU_row(cinfo);
394 return TRUE;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000395}
396
397#endif /* FULL_COEF_BUFFER_SUPPORTED */
398
399
400/*
401 * Initialize coefficient buffer controller.
402 */
403
Thomas G. Lane489583f1996-02-07 00:00:00 +0000404GLOBAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000405jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
406{
407 my_coef_ptr coef;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000408
409 coef = (my_coef_ptr)
410 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
DRC5de454b2014-05-18 19:04:03 +0000411 sizeof(my_coef_controller));
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000412 cinfo->coef = (struct jpeg_c_coef_controller *) coef;
413 coef->pub.start_pass = start_pass_coef;
414
415 /* Create the coefficient buffer. */
416 if (need_full_buffer) {
417#ifdef FULL_COEF_BUFFER_SUPPORTED
418 /* Allocate a full-image virtual array for each component, */
419 /* padded to a multiple of samp_factor DCT blocks in each direction. */
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000420 int ci;
421 jpeg_component_info *compptr;
422
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000423 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
DRCe5eaf372014-05-09 18:00:32 +0000424 ci++, compptr++) {
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000425 coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
DRCe5eaf372014-05-09 18:00:32 +0000426 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
427 (JDIMENSION) jround_up((long) compptr->width_in_blocks,
428 (long) compptr->h_samp_factor),
429 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
430 (long) compptr->v_samp_factor),
431 (JDIMENSION) compptr->v_samp_factor);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000432 }
433#else
434 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
435#endif
436 } else {
437 /* We only need a single-MCU buffer. */
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000438 JBLOCKROW buffer;
439 int i;
440
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000441 buffer = (JBLOCKROW)
442 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
DRC5de454b2014-05-18 19:04:03 +0000443 C_MAX_BLOCKS_IN_MCU * sizeof(JBLOCK));
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000444 for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000445 coef->MCU_buffer[i] = buffer + i;
446 }
447 coef->whole_image[0] = NULL; /* flag for no virtual arrays */
448 }
449}