dbf-halloween2015

annotate libs/libjpeg/jcmainct.c @ 3:c37fe5d8a4ed

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windows port
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 06:04:28 +0200
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nuclear@1 1 /*
nuclear@1 2 * jcmainct.c
nuclear@1 3 *
nuclear@1 4 * Copyright (C) 1994-1996, Thomas G. Lane.
nuclear@1 5 * This file is part of the Independent JPEG Group's software.
nuclear@1 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@1 7 *
nuclear@1 8 * This file contains the main buffer controller for compression.
nuclear@1 9 * The main buffer lies between the pre-processor and the JPEG
nuclear@1 10 * compressor proper; it holds downsampled data in the JPEG colorspace.
nuclear@1 11 */
nuclear@1 12
nuclear@1 13 #define JPEG_INTERNALS
nuclear@1 14 #include "jinclude.h"
nuclear@1 15 #include "jpeglib.h"
nuclear@1 16
nuclear@1 17
nuclear@1 18 /* Note: currently, there is no operating mode in which a full-image buffer
nuclear@1 19 * is needed at this step. If there were, that mode could not be used with
nuclear@1 20 * "raw data" input, since this module is bypassed in that case. However,
nuclear@1 21 * we've left the code here for possible use in special applications.
nuclear@1 22 */
nuclear@1 23 #undef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 24
nuclear@1 25
nuclear@1 26 /* Private buffer controller object */
nuclear@1 27
nuclear@1 28 typedef struct {
nuclear@1 29 struct jpeg_c_main_controller pub; /* public fields */
nuclear@1 30
nuclear@1 31 JDIMENSION cur_iMCU_row; /* number of current iMCU row */
nuclear@1 32 JDIMENSION rowgroup_ctr; /* counts row groups received in iMCU row */
nuclear@1 33 boolean suspended; /* remember if we suspended output */
nuclear@1 34 J_BUF_MODE pass_mode; /* current operating mode */
nuclear@1 35
nuclear@1 36 /* If using just a strip buffer, this points to the entire set of buffers
nuclear@1 37 * (we allocate one for each component). In the full-image case, this
nuclear@1 38 * points to the currently accessible strips of the virtual arrays.
nuclear@1 39 */
nuclear@1 40 JSAMPARRAY buffer[MAX_COMPONENTS];
nuclear@1 41
nuclear@1 42 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 43 /* If using full-image storage, this array holds pointers to virtual-array
nuclear@1 44 * control blocks for each component. Unused if not full-image storage.
nuclear@1 45 */
nuclear@1 46 jvirt_sarray_ptr whole_image[MAX_COMPONENTS];
nuclear@1 47 #endif
nuclear@1 48 } my_main_controller;
nuclear@1 49
nuclear@1 50 typedef my_main_controller * my_main_ptr;
nuclear@1 51
nuclear@1 52
nuclear@1 53 /* Forward declarations */
nuclear@1 54 METHODDEF(void) process_data_simple_main
nuclear@1 55 JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf,
nuclear@1 56 JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail));
nuclear@1 57 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 58 METHODDEF(void) process_data_buffer_main
nuclear@1 59 JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf,
nuclear@1 60 JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail));
nuclear@1 61 #endif
nuclear@1 62
nuclear@1 63
nuclear@1 64 /*
nuclear@1 65 * Initialize for a processing pass.
nuclear@1 66 */
nuclear@1 67
nuclear@1 68 METHODDEF(void)
nuclear@1 69 start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
nuclear@1 70 {
nuclear@1 71 my_main_ptr main = (my_main_ptr) cinfo->main;
nuclear@1 72
nuclear@1 73 /* Do nothing in raw-data mode. */
nuclear@1 74 if (cinfo->raw_data_in)
nuclear@1 75 return;
nuclear@1 76
nuclear@1 77 main->cur_iMCU_row = 0; /* initialize counters */
nuclear@1 78 main->rowgroup_ctr = 0;
nuclear@1 79 main->suspended = FALSE;
nuclear@1 80 main->pass_mode = pass_mode; /* save mode for use by process_data */
nuclear@1 81
nuclear@1 82 switch (pass_mode) {
nuclear@1 83 case JBUF_PASS_THRU:
nuclear@1 84 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 85 if (main->whole_image[0] != NULL)
nuclear@1 86 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@1 87 #endif
nuclear@1 88 main->pub.process_data = process_data_simple_main;
nuclear@1 89 break;
nuclear@1 90 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 91 case JBUF_SAVE_SOURCE:
nuclear@1 92 case JBUF_CRANK_DEST:
nuclear@1 93 case JBUF_SAVE_AND_PASS:
nuclear@1 94 if (main->whole_image[0] == NULL)
nuclear@1 95 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@1 96 main->pub.process_data = process_data_buffer_main;
nuclear@1 97 break;
nuclear@1 98 #endif
nuclear@1 99 default:
nuclear@1 100 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@1 101 break;
nuclear@1 102 }
nuclear@1 103 }
nuclear@1 104
nuclear@1 105
nuclear@1 106 /*
nuclear@1 107 * Process some data.
nuclear@1 108 * This routine handles the simple pass-through mode,
nuclear@1 109 * where we have only a strip buffer.
nuclear@1 110 */
nuclear@1 111
nuclear@1 112 METHODDEF(void)
nuclear@1 113 process_data_simple_main (j_compress_ptr cinfo,
nuclear@1 114 JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
nuclear@1 115 JDIMENSION in_rows_avail)
nuclear@1 116 {
nuclear@1 117 my_main_ptr main = (my_main_ptr) cinfo->main;
nuclear@1 118
nuclear@1 119 while (main->cur_iMCU_row < cinfo->total_iMCU_rows) {
nuclear@1 120 /* Read input data if we haven't filled the main buffer yet */
nuclear@1 121 if (main->rowgroup_ctr < DCTSIZE)
nuclear@1 122 (*cinfo->prep->pre_process_data) (cinfo,
nuclear@1 123 input_buf, in_row_ctr, in_rows_avail,
nuclear@1 124 main->buffer, &main->rowgroup_ctr,
nuclear@1 125 (JDIMENSION) DCTSIZE);
nuclear@1 126
nuclear@1 127 /* If we don't have a full iMCU row buffered, return to application for
nuclear@1 128 * more data. Note that preprocessor will always pad to fill the iMCU row
nuclear@1 129 * at the bottom of the image.
nuclear@1 130 */
nuclear@1 131 if (main->rowgroup_ctr != DCTSIZE)
nuclear@1 132 return;
nuclear@1 133
nuclear@1 134 /* Send the completed row to the compressor */
nuclear@1 135 if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) {
nuclear@1 136 /* If compressor did not consume the whole row, then we must need to
nuclear@1 137 * suspend processing and return to the application. In this situation
nuclear@1 138 * we pretend we didn't yet consume the last input row; otherwise, if
nuclear@1 139 * it happened to be the last row of the image, the application would
nuclear@1 140 * think we were done.
nuclear@1 141 */
nuclear@1 142 if (! main->suspended) {
nuclear@1 143 (*in_row_ctr)--;
nuclear@1 144 main->suspended = TRUE;
nuclear@1 145 }
nuclear@1 146 return;
nuclear@1 147 }
nuclear@1 148 /* We did finish the row. Undo our little suspension hack if a previous
nuclear@1 149 * call suspended; then mark the main buffer empty.
nuclear@1 150 */
nuclear@1 151 if (main->suspended) {
nuclear@1 152 (*in_row_ctr)++;
nuclear@1 153 main->suspended = FALSE;
nuclear@1 154 }
nuclear@1 155 main->rowgroup_ctr = 0;
nuclear@1 156 main->cur_iMCU_row++;
nuclear@1 157 }
nuclear@1 158 }
nuclear@1 159
nuclear@1 160
nuclear@1 161 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 162
nuclear@1 163 /*
nuclear@1 164 * Process some data.
nuclear@1 165 * This routine handles all of the modes that use a full-size buffer.
nuclear@1 166 */
nuclear@1 167
nuclear@1 168 METHODDEF(void)
nuclear@1 169 process_data_buffer_main (j_compress_ptr cinfo,
nuclear@1 170 JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
nuclear@1 171 JDIMENSION in_rows_avail)
nuclear@1 172 {
nuclear@1 173 my_main_ptr main = (my_main_ptr) cinfo->main;
nuclear@1 174 int ci;
nuclear@1 175 jpeg_component_info *compptr;
nuclear@1 176 boolean writing = (main->pass_mode != JBUF_CRANK_DEST);
nuclear@1 177
nuclear@1 178 while (main->cur_iMCU_row < cinfo->total_iMCU_rows) {
nuclear@1 179 /* Realign the virtual buffers if at the start of an iMCU row. */
nuclear@1 180 if (main->rowgroup_ctr == 0) {
nuclear@1 181 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@1 182 ci++, compptr++) {
nuclear@1 183 main->buffer[ci] = (*cinfo->mem->access_virt_sarray)
nuclear@1 184 ((j_common_ptr) cinfo, main->whole_image[ci],
nuclear@1 185 main->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE),
nuclear@1 186 (JDIMENSION) (compptr->v_samp_factor * DCTSIZE), writing);
nuclear@1 187 }
nuclear@1 188 /* In a read pass, pretend we just read some source data. */
nuclear@1 189 if (! writing) {
nuclear@1 190 *in_row_ctr += cinfo->max_v_samp_factor * DCTSIZE;
nuclear@1 191 main->rowgroup_ctr = DCTSIZE;
nuclear@1 192 }
nuclear@1 193 }
nuclear@1 194
nuclear@1 195 /* If a write pass, read input data until the current iMCU row is full. */
nuclear@1 196 /* Note: preprocessor will pad if necessary to fill the last iMCU row. */
nuclear@1 197 if (writing) {
nuclear@1 198 (*cinfo->prep->pre_process_data) (cinfo,
nuclear@1 199 input_buf, in_row_ctr, in_rows_avail,
nuclear@1 200 main->buffer, &main->rowgroup_ctr,
nuclear@1 201 (JDIMENSION) DCTSIZE);
nuclear@1 202 /* Return to application if we need more data to fill the iMCU row. */
nuclear@1 203 if (main->rowgroup_ctr < DCTSIZE)
nuclear@1 204 return;
nuclear@1 205 }
nuclear@1 206
nuclear@1 207 /* Emit data, unless this is a sink-only pass. */
nuclear@1 208 if (main->pass_mode != JBUF_SAVE_SOURCE) {
nuclear@1 209 if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) {
nuclear@1 210 /* If compressor did not consume the whole row, then we must need to
nuclear@1 211 * suspend processing and return to the application. In this situation
nuclear@1 212 * we pretend we didn't yet consume the last input row; otherwise, if
nuclear@1 213 * it happened to be the last row of the image, the application would
nuclear@1 214 * think we were done.
nuclear@1 215 */
nuclear@1 216 if (! main->suspended) {
nuclear@1 217 (*in_row_ctr)--;
nuclear@1 218 main->suspended = TRUE;
nuclear@1 219 }
nuclear@1 220 return;
nuclear@1 221 }
nuclear@1 222 /* We did finish the row. Undo our little suspension hack if a previous
nuclear@1 223 * call suspended; then mark the main buffer empty.
nuclear@1 224 */
nuclear@1 225 if (main->suspended) {
nuclear@1 226 (*in_row_ctr)++;
nuclear@1 227 main->suspended = FALSE;
nuclear@1 228 }
nuclear@1 229 }
nuclear@1 230
nuclear@1 231 /* If get here, we are done with this iMCU row. Mark buffer empty. */
nuclear@1 232 main->rowgroup_ctr = 0;
nuclear@1 233 main->cur_iMCU_row++;
nuclear@1 234 }
nuclear@1 235 }
nuclear@1 236
nuclear@1 237 #endif /* FULL_MAIN_BUFFER_SUPPORTED */
nuclear@1 238
nuclear@1 239
nuclear@1 240 /*
nuclear@1 241 * Initialize main buffer controller.
nuclear@1 242 */
nuclear@1 243
nuclear@1 244 GLOBAL(void)
nuclear@1 245 jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer)
nuclear@1 246 {
nuclear@1 247 my_main_ptr main;
nuclear@1 248 int ci;
nuclear@1 249 jpeg_component_info *compptr;
nuclear@1 250
nuclear@1 251 main = (my_main_ptr)
nuclear@1 252 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@1 253 SIZEOF(my_main_controller));
nuclear@1 254 cinfo->main = (struct jpeg_c_main_controller *) main;
nuclear@1 255 main->pub.start_pass = start_pass_main;
nuclear@1 256
nuclear@1 257 /* We don't need to create a buffer in raw-data mode. */
nuclear@1 258 if (cinfo->raw_data_in)
nuclear@1 259 return;
nuclear@1 260
nuclear@1 261 /* Create the buffer. It holds downsampled data, so each component
nuclear@1 262 * may be of a different size.
nuclear@1 263 */
nuclear@1 264 if (need_full_buffer) {
nuclear@1 265 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 266 /* Allocate a full-image virtual array for each component */
nuclear@1 267 /* Note we pad the bottom to a multiple of the iMCU height */
nuclear@1 268 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@1 269 ci++, compptr++) {
nuclear@1 270 main->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
nuclear@1 271 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
nuclear@1 272 compptr->width_in_blocks * DCTSIZE,
nuclear@1 273 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
nuclear@1 274 (long) compptr->v_samp_factor) * DCTSIZE,
nuclear@1 275 (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
nuclear@1 276 }
nuclear@1 277 #else
nuclear@1 278 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
nuclear@1 279 #endif
nuclear@1 280 } else {
nuclear@1 281 #ifdef FULL_MAIN_BUFFER_SUPPORTED
nuclear@1 282 main->whole_image[0] = NULL; /* flag for no virtual arrays */
nuclear@1 283 #endif
nuclear@1 284 /* Allocate a strip buffer for each component */
nuclear@1 285 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@1 286 ci++, compptr++) {
nuclear@1 287 main->buffer[ci] = (*cinfo->mem->alloc_sarray)
nuclear@1 288 ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@1 289 compptr->width_in_blocks * DCTSIZE,
nuclear@1 290 (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
nuclear@1 291 }
nuclear@1 292 }
nuclear@1 293 }