Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * rdrle.c |
| 3 | * |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame^] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1991-1996, Thomas G. Lane. |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame^] | 6 | * It was modified by The libjpeg-turbo Project to include only information |
| 7 | * relevant to libjpeg-turbo. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 8 | * For conditions of distribution and use, see the accompanying README file. |
| 9 | * |
| 10 | * This file contains routines to read input images in Utah RLE format. |
| 11 | * The Utah Raster Toolkit library is required (version 3.1 or later). |
| 12 | * |
| 13 | * These routines may need modification for non-Unix environments or |
| 14 | * specialized applications. As they stand, they assume input from |
| 15 | * an ordinary stdio stream. They further assume that reading begins |
| 16 | * at the start of the file; start_input may need work if the |
| 17 | * user interface has already read some data (e.g., to determine that |
| 18 | * the file is indeed RLE format). |
| 19 | * |
| 20 | * Based on code contributed by Mike Lijewski, |
| 21 | * with updates from Robert Hutchinson. |
| 22 | */ |
| 23 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 24 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 25 | |
| 26 | #ifdef RLE_SUPPORTED |
| 27 | |
| 28 | /* rle.h is provided by the Utah Raster Toolkit. */ |
| 29 | |
| 30 | #include <rle.h> |
| 31 | |
| 32 | /* |
| 33 | * We assume that JSAMPLE has the same representation as rle_pixel, |
| 34 | * to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples. |
| 35 | */ |
| 36 | |
| 37 | #if BITS_IN_JSAMPLE != 8 |
| 38 | Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ |
| 39 | #endif |
| 40 | |
| 41 | /* |
| 42 | * We support the following types of RLE files: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 43 | * |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 44 | * GRAYSCALE - 8 bits, no colormap |
| 45 | * MAPPEDGRAY - 8 bits, 1 channel colomap |
| 46 | * PSEUDOCOLOR - 8 bits, 3 channel colormap |
| 47 | * TRUECOLOR - 24 bits, 3 channel colormap |
| 48 | * DIRECTCOLOR - 24 bits, no colormap |
| 49 | * |
| 50 | * For now, we ignore any alpha channel in the image. |
| 51 | */ |
| 52 | |
| 53 | typedef enum |
| 54 | { GRAYSCALE, MAPPEDGRAY, PSEUDOCOLOR, TRUECOLOR, DIRECTCOLOR } rle_kind; |
| 55 | |
| 56 | |
| 57 | /* |
| 58 | * Since RLE stores scanlines bottom-to-top, we have to invert the image |
| 59 | * to conform to JPEG's top-to-bottom order. To do this, we read the |
| 60 | * incoming image into a virtual array on the first get_pixel_rows call, |
| 61 | * then fetch the required row from the virtual array on subsequent calls. |
| 62 | */ |
| 63 | |
| 64 | typedef struct _rle_source_struct * rle_source_ptr; |
| 65 | |
| 66 | typedef struct _rle_source_struct { |
| 67 | struct cjpeg_source_struct pub; /* public fields */ |
| 68 | |
| 69 | rle_kind visual; /* actual type of input file */ |
| 70 | jvirt_sarray_ptr image; /* virtual array to hold the image */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 71 | JDIMENSION row; /* current row # in the virtual array */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 72 | rle_hdr header; /* Input file information */ |
| 73 | rle_pixel** rle_row; /* holds a row returned by rle_getrow() */ |
| 74 | |
| 75 | } rle_source_struct; |
| 76 | |
| 77 | |
| 78 | /* |
| 79 | * Read the file header; return image size and component count. |
| 80 | */ |
| 81 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 82 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 83 | start_input_rle (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 84 | { |
| 85 | rle_source_ptr source = (rle_source_ptr) sinfo; |
| 86 | JDIMENSION width, height; |
| 87 | #ifdef PROGRESS_REPORT |
| 88 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 89 | #endif |
| 90 | |
| 91 | /* Use RLE library routine to get the header info */ |
| 92 | source->header = *rle_hdr_init(NULL); |
| 93 | source->header.rle_file = source->pub.input_file; |
| 94 | switch (rle_get_setup(&(source->header))) { |
| 95 | case RLE_SUCCESS: |
| 96 | /* A-OK */ |
| 97 | break; |
| 98 | case RLE_NOT_RLE: |
| 99 | ERREXIT(cinfo, JERR_RLE_NOT); |
| 100 | break; |
| 101 | case RLE_NO_SPACE: |
| 102 | ERREXIT(cinfo, JERR_RLE_MEM); |
| 103 | break; |
| 104 | case RLE_EMPTY: |
| 105 | ERREXIT(cinfo, JERR_RLE_EMPTY); |
| 106 | break; |
| 107 | case RLE_EOF: |
| 108 | ERREXIT(cinfo, JERR_RLE_EOF); |
| 109 | break; |
| 110 | default: |
| 111 | ERREXIT(cinfo, JERR_RLE_BADERROR); |
| 112 | break; |
| 113 | } |
| 114 | |
| 115 | /* Figure out what we have, set private vars and return values accordingly */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 116 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 117 | width = source->header.xmax - source->header.xmin + 1; |
| 118 | height = source->header.ymax - source->header.ymin + 1; |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 119 | source->header.xmin = 0; /* realign horizontally */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 120 | source->header.xmax = width-1; |
| 121 | |
| 122 | cinfo->image_width = width; |
| 123 | cinfo->image_height = height; |
| 124 | cinfo->data_precision = 8; /* we can only handle 8 bit data */ |
| 125 | |
| 126 | if (source->header.ncolors == 1 && source->header.ncmap == 0) { |
| 127 | source->visual = GRAYSCALE; |
| 128 | TRACEMS2(cinfo, 1, JTRC_RLE_GRAY, width, height); |
| 129 | } else if (source->header.ncolors == 1 && source->header.ncmap == 1) { |
| 130 | source->visual = MAPPEDGRAY; |
| 131 | TRACEMS3(cinfo, 1, JTRC_RLE_MAPGRAY, width, height, |
| 132 | 1 << source->header.cmaplen); |
| 133 | } else if (source->header.ncolors == 1 && source->header.ncmap == 3) { |
| 134 | source->visual = PSEUDOCOLOR; |
| 135 | TRACEMS3(cinfo, 1, JTRC_RLE_MAPPED, width, height, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 136 | 1 << source->header.cmaplen); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 137 | } else if (source->header.ncolors == 3 && source->header.ncmap == 3) { |
| 138 | source->visual = TRUECOLOR; |
| 139 | TRACEMS3(cinfo, 1, JTRC_RLE_FULLMAP, width, height, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 140 | 1 << source->header.cmaplen); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 141 | } else if (source->header.ncolors == 3 && source->header.ncmap == 0) { |
| 142 | source->visual = DIRECTCOLOR; |
| 143 | TRACEMS2(cinfo, 1, JTRC_RLE, width, height); |
| 144 | } else |
| 145 | ERREXIT(cinfo, JERR_RLE_UNSUPPORTED); |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 146 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 147 | if (source->visual == GRAYSCALE || source->visual == MAPPEDGRAY) { |
| 148 | cinfo->in_color_space = JCS_GRAYSCALE; |
| 149 | cinfo->input_components = 1; |
| 150 | } else { |
| 151 | cinfo->in_color_space = JCS_RGB; |
| 152 | cinfo->input_components = 3; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * A place to hold each scanline while it's converted. |
| 157 | * (GRAYSCALE scanlines don't need converting) |
| 158 | */ |
| 159 | if (source->visual != GRAYSCALE) { |
| 160 | source->rle_row = (rle_pixel**) (*cinfo->mem->alloc_sarray) |
| 161 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 162 | (JDIMENSION) width, (JDIMENSION) cinfo->input_components); |
| 163 | } |
| 164 | |
| 165 | /* request a virtual array to hold the image */ |
| 166 | source->image = (*cinfo->mem->request_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 167 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 168 | (JDIMENSION) (width * source->header.ncolors), |
| 169 | (JDIMENSION) height, (JDIMENSION) 1); |
| 170 | |
| 171 | #ifdef PROGRESS_REPORT |
| 172 | if (progress != NULL) { |
| 173 | /* count file input as separate pass */ |
| 174 | progress->total_extra_passes++; |
| 175 | } |
| 176 | #endif |
| 177 | |
| 178 | source->pub.buffer_height = 1; |
| 179 | } |
| 180 | |
| 181 | |
| 182 | /* |
| 183 | * Read one row of pixels. |
| 184 | * Called only after load_image has read the image into the virtual array. |
| 185 | * Used for GRAYSCALE, MAPPEDGRAY, TRUECOLOR, and DIRECTCOLOR images. |
| 186 | */ |
| 187 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 188 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 189 | get_rle_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 190 | { |
| 191 | rle_source_ptr source = (rle_source_ptr) sinfo; |
| 192 | |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 193 | source->row--; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 194 | source->pub.buffer = (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 195 | ((j_common_ptr) cinfo, source->image, source->row, (JDIMENSION) 1, FALSE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 196 | |
| 197 | return 1; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Read one row of pixels. |
| 202 | * Called only after load_image has read the image into the virtual array. |
| 203 | * Used for PSEUDOCOLOR images. |
| 204 | */ |
| 205 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 206 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 207 | get_pseudocolor_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 208 | { |
| 209 | rle_source_ptr source = (rle_source_ptr) sinfo; |
| 210 | JSAMPROW src_row, dest_row; |
| 211 | JDIMENSION col; |
| 212 | rle_map *colormap; |
| 213 | int val; |
| 214 | |
| 215 | colormap = source->header.cmap; |
| 216 | dest_row = source->pub.buffer[0]; |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 217 | source->row--; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 218 | src_row = * (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 219 | ((j_common_ptr) cinfo, source->image, source->row, (JDIMENSION) 1, FALSE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 220 | |
| 221 | for (col = cinfo->image_width; col > 0; col--) { |
| 222 | val = GETJSAMPLE(*src_row++); |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 223 | *dest_row++ = (JSAMPLE) (colormap[val ] >> 8); |
| 224 | *dest_row++ = (JSAMPLE) (colormap[val + 256] >> 8); |
| 225 | *dest_row++ = (JSAMPLE) (colormap[val + 512] >> 8); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | return 1; |
| 229 | } |
| 230 | |
| 231 | |
| 232 | /* |
| 233 | * Load the image into a virtual array. We have to do this because RLE |
| 234 | * files start at the lower left while the JPEG standard has them starting |
| 235 | * in the upper left. This is called the first time we want to get a row |
| 236 | * of input. What we do is load the RLE data into the array and then call |
| 237 | * the appropriate routine to read one row from the array. Before returning, |
| 238 | * we set source->pub.get_pixel_rows so that subsequent calls go straight to |
| 239 | * the appropriate row-reading routine. |
| 240 | */ |
| 241 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 242 | METHODDEF(JDIMENSION) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 243 | load_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 244 | { |
| 245 | rle_source_ptr source = (rle_source_ptr) sinfo; |
| 246 | JDIMENSION row, col; |
| 247 | JSAMPROW scanline, red_ptr, green_ptr, blue_ptr; |
| 248 | rle_pixel **rle_row; |
| 249 | rle_map *colormap; |
| 250 | char channel; |
| 251 | #ifdef PROGRESS_REPORT |
| 252 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 253 | #endif |
| 254 | |
| 255 | colormap = source->header.cmap; |
| 256 | rle_row = source->rle_row; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 257 | |
| 258 | /* Read the RLE data into our virtual array. |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame^] | 259 | * We assume here that rle_pixel is represented the same as JSAMPLE. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 260 | */ |
| 261 | RLE_CLR_BIT(source->header, RLE_ALPHA); /* don't read the alpha channel */ |
| 262 | |
| 263 | #ifdef PROGRESS_REPORT |
| 264 | if (progress != NULL) { |
| 265 | progress->pub.pass_limit = cinfo->image_height; |
| 266 | progress->pub.pass_counter = 0; |
| 267 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 268 | } |
| 269 | #endif |
| 270 | |
| 271 | switch (source->visual) { |
| 272 | |
| 273 | case GRAYSCALE: |
| 274 | case PSEUDOCOLOR: |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 275 | for (row = 0; row < cinfo->image_height; row++) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 276 | rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 277 | ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 278 | rle_getrow(&source->header, rle_row); |
| 279 | #ifdef PROGRESS_REPORT |
| 280 | if (progress != NULL) { |
| 281 | progress->pub.pass_counter++; |
| 282 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 283 | } |
| 284 | #endif |
| 285 | } |
| 286 | break; |
| 287 | |
| 288 | case MAPPEDGRAY: |
| 289 | case TRUECOLOR: |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 290 | for (row = 0; row < cinfo->image_height; row++) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 291 | scanline = * (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 292 | ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 293 | rle_row = source->rle_row; |
| 294 | rle_getrow(&source->header, rle_row); |
| 295 | |
| 296 | for (col = 0; col < cinfo->image_width; col++) { |
| 297 | for (channel = 0; channel < source->header.ncolors; channel++) { |
| 298 | *scanline++ = (JSAMPLE) |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 299 | (colormap[GETJSAMPLE(rle_row[channel][col]) + 256 * channel] >> 8); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 300 | } |
| 301 | } |
| 302 | |
| 303 | #ifdef PROGRESS_REPORT |
| 304 | if (progress != NULL) { |
| 305 | progress->pub.pass_counter++; |
| 306 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 307 | } |
| 308 | #endif |
| 309 | } |
| 310 | break; |
| 311 | |
| 312 | case DIRECTCOLOR: |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 313 | for (row = 0; row < cinfo->image_height; row++) { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 314 | scanline = * (*cinfo->mem->access_virt_sarray) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 315 | ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 316 | rle_getrow(&source->header, rle_row); |
| 317 | |
| 318 | red_ptr = rle_row[0]; |
| 319 | green_ptr = rle_row[1]; |
| 320 | blue_ptr = rle_row[2]; |
| 321 | |
| 322 | for (col = cinfo->image_width; col > 0; col--) { |
| 323 | *scanline++ = *red_ptr++; |
| 324 | *scanline++ = *green_ptr++; |
| 325 | *scanline++ = *blue_ptr++; |
| 326 | } |
| 327 | |
| 328 | #ifdef PROGRESS_REPORT |
| 329 | if (progress != NULL) { |
| 330 | progress->pub.pass_counter++; |
| 331 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 332 | } |
| 333 | #endif |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | #ifdef PROGRESS_REPORT |
| 338 | if (progress != NULL) |
| 339 | progress->completed_extra_passes++; |
| 340 | #endif |
| 341 | |
| 342 | /* Set up to call proper row-extraction routine in future */ |
| 343 | if (source->visual == PSEUDOCOLOR) { |
| 344 | source->pub.buffer = source->rle_row; |
| 345 | source->pub.get_pixel_rows = get_pseudocolor_row; |
| 346 | } else { |
| 347 | source->pub.get_pixel_rows = get_rle_row; |
| 348 | } |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 349 | source->row = cinfo->image_height; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 350 | |
| 351 | /* And fetch the topmost (bottommost) row */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 352 | return (*source->pub.get_pixel_rows) (cinfo, sinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | |
| 356 | /* |
| 357 | * Finish up at the end of the file. |
| 358 | */ |
| 359 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 360 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 361 | finish_input_rle (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| 362 | { |
| 363 | /* no work */ |
| 364 | } |
| 365 | |
| 366 | |
| 367 | /* |
| 368 | * The module selection routine for RLE format input. |
| 369 | */ |
| 370 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 371 | GLOBAL(cjpeg_source_ptr) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 372 | jinit_read_rle (j_compress_ptr cinfo) |
| 373 | { |
| 374 | rle_source_ptr source; |
| 375 | |
| 376 | /* Create module interface object */ |
| 377 | source = (rle_source_ptr) |
| 378 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 379 | SIZEOF(rle_source_struct)); |
| 380 | /* Fill in method ptrs */ |
| 381 | source->pub.start_input = start_input_rle; |
| 382 | source->pub.finish_input = finish_input_rle; |
| 383 | source->pub.get_pixel_rows = load_image; |
| 384 | |
| 385 | return (cjpeg_source_ptr) source; |
| 386 | } |
| 387 | |
| 388 | #endif /* RLE_SUPPORTED */ |