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| 1 /* |
| 2 * wrrle.c |
| 3 * |
| 4 * Copyright (C) 1991-1996, Thomas G. Lane. |
| 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 routines to write output images in RLE format. |
| 9 * The Utah Raster Toolkit library is required (version 3.1 or later). |
| 10 * |
| 11 * These routines may need modification for non-Unix environments or |
| 12 * specialized applications. As they stand, they assume output to |
| 13 * an ordinary stdio stream. |
| 14 * |
| 15 * Based on code contributed by Mike Lijewski, |
| 16 * with updates from Robert Hutchinson. |
| 17 */ |
| 18 |
| 19 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
| 20 |
| 21 #ifdef RLE_SUPPORTED |
| 22 |
| 23 /* rle.h is provided by the Utah Raster Toolkit. */ |
| 24 |
| 25 #include <rle.h> |
| 26 |
| 27 /* |
| 28 * We assume that JSAMPLE has the same representation as rle_pixel, |
| 29 * to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples. |
| 30 */ |
| 31 |
| 32 #if BITS_IN_JSAMPLE != 8 |
| 33 Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ |
| 34 #endif |
| 35 |
| 36 |
| 37 /* |
| 38 * Since RLE stores scanlines bottom-to-top, we have to invert the image |
| 39 * from JPEG's top-to-bottom order. To do this, we save the outgoing data |
| 40 * in a virtual array during put_pixel_row calls, then actually emit the |
| 41 * RLE file during finish_output. |
| 42 */ |
| 43 |
| 44 |
| 45 /* |
| 46 * For now, if we emit an RLE color map then it is always 256 entries long, |
| 47 * though not all of the entries need be used. |
| 48 */ |
| 49 |
| 50 #define CMAPBITS 8 |
| 51 #define CMAPLENGTH (1<<(CMAPBITS)) |
| 52 |
| 53 typedef struct { |
| 54 struct djpeg_dest_struct pub; /* public fields */ |
| 55 |
| 56 jvirt_sarray_ptr image; /* virtual array to store the output image */ |
| 57 rle_map *colormap; /* RLE-style color map, or NULL if none */ |
| 58 rle_pixel **rle_row; /* To pass rows to rle_putrow() */ |
| 59 |
| 60 } rle_dest_struct; |
| 61 |
| 62 typedef rle_dest_struct * rle_dest_ptr; |
| 63 |
| 64 /* Forward declarations */ |
| 65 METHODDEF(void) rle_put_pixel_rows |
| 66 JPP((j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
| 67 JDIMENSION rows_supplied)); |
| 68 |
| 69 |
| 70 /* |
| 71 * Write the file header. |
| 72 * |
| 73 * In this module it's easier to wait till finish_output to write anything. |
| 74 */ |
| 75 |
| 76 METHODDEF(void) |
| 77 start_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
| 78 { |
| 79 rle_dest_ptr dest = (rle_dest_ptr) dinfo; |
| 80 size_t cmapsize; |
| 81 int i, ci; |
| 82 #ifdef PROGRESS_REPORT |
| 83 cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 84 #endif |
| 85 |
| 86 /* |
| 87 * Make sure the image can be stored in RLE format. |
| 88 * |
| 89 * - RLE stores image dimensions as *signed* 16 bit integers. JPEG |
| 90 * uses unsigned, so we have to check the width. |
| 91 * |
| 92 * - Colorspace is expected to be grayscale or RGB. |
| 93 * |
| 94 * - The number of channels (components) is expected to be 1 (grayscale/ |
| 95 * pseudocolor) or 3 (truecolor/directcolor). |
| 96 * (could be 2 or 4 if using an alpha channel, but we aren't) |
| 97 */ |
| 98 |
| 99 if (cinfo->output_width > 32767 || cinfo->output_height > 32767) |
| 100 ERREXIT2(cinfo, JERR_RLE_DIMENSIONS, cinfo->output_width, |
| 101 cinfo->output_height); |
| 102 |
| 103 if (cinfo->out_color_space != JCS_GRAYSCALE && |
| 104 cinfo->out_color_space != JCS_RGB) |
| 105 ERREXIT(cinfo, JERR_RLE_COLORSPACE); |
| 106 |
| 107 if (cinfo->output_components != 1 && cinfo->output_components != 3) |
| 108 ERREXIT1(cinfo, JERR_RLE_TOOMANYCHANNELS, cinfo->num_components); |
| 109 |
| 110 /* Convert colormap, if any, to RLE format. */ |
| 111 |
| 112 dest->colormap = NULL; |
| 113 |
| 114 if (cinfo->quantize_colors) { |
| 115 /* Allocate storage for RLE-style cmap, zero any extra entries */ |
| 116 cmapsize = cinfo->out_color_components * CMAPLENGTH * SIZEOF(rle_map); |
| 117 dest->colormap = (rle_map *) (*cinfo->mem->alloc_small) |
| 118 ((j_common_ptr) cinfo, JPOOL_IMAGE, cmapsize); |
| 119 MEMZERO(dest->colormap, cmapsize); |
| 120 |
| 121 /* Save away data in RLE format --- note 8-bit left shift! */ |
| 122 /* Shifting would need adjustment for JSAMPLEs wider than 8 bits. */ |
| 123 for (ci = 0; ci < cinfo->out_color_components; ci++) { |
| 124 for (i = 0; i < cinfo->actual_number_of_colors; i++) { |
| 125 dest->colormap[ci * CMAPLENGTH + i] = |
| 126 GETJSAMPLE(cinfo->colormap[ci][i]) << 8; |
| 127 } |
| 128 } |
| 129 } |
| 130 |
| 131 /* Set the output buffer to the first row */ |
| 132 dest->pub.buffer = (*cinfo->mem->access_virt_sarray) |
| 133 ((j_common_ptr) cinfo, dest->image, (JDIMENSION) 0, (JDIMENSION) 1, TRUE); |
| 134 dest->pub.buffer_height = 1; |
| 135 |
| 136 dest->pub.put_pixel_rows = rle_put_pixel_rows; |
| 137 |
| 138 #ifdef PROGRESS_REPORT |
| 139 if (progress != NULL) { |
| 140 progress->total_extra_passes++; /* count file writing as separate pass */ |
| 141 } |
| 142 #endif |
| 143 } |
| 144 |
| 145 |
| 146 /* |
| 147 * Write some pixel data. |
| 148 * |
| 149 * This routine just saves the data away in a virtual array. |
| 150 */ |
| 151 |
| 152 METHODDEF(void) |
| 153 rle_put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
| 154 JDIMENSION rows_supplied) |
| 155 { |
| 156 rle_dest_ptr dest = (rle_dest_ptr) dinfo; |
| 157 |
| 158 if (cinfo->output_scanline < cinfo->output_height) { |
| 159 dest->pub.buffer = (*cinfo->mem->access_virt_sarray) |
| 160 ((j_common_ptr) cinfo, dest->image, |
| 161 cinfo->output_scanline, (JDIMENSION) 1, TRUE); |
| 162 } |
| 163 } |
| 164 |
| 165 /* |
| 166 * Finish up at the end of the file. |
| 167 * |
| 168 * Here is where we really output the RLE file. |
| 169 */ |
| 170 |
| 171 METHODDEF(void) |
| 172 finish_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
| 173 { |
| 174 rle_dest_ptr dest = (rle_dest_ptr) dinfo; |
| 175 rle_hdr header; /* Output file information */ |
| 176 rle_pixel **rle_row, *red, *green, *blue; |
| 177 JSAMPROW output_row; |
| 178 char cmapcomment[80]; |
| 179 int row, col; |
| 180 int ci; |
| 181 #ifdef PROGRESS_REPORT |
| 182 cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| 183 #endif |
| 184 |
| 185 /* Initialize the header info */ |
| 186 header = *rle_hdr_init(NULL); |
| 187 header.rle_file = dest->pub.output_file; |
| 188 header.xmin = 0; |
| 189 header.xmax = cinfo->output_width - 1; |
| 190 header.ymin = 0; |
| 191 header.ymax = cinfo->output_height - 1; |
| 192 header.alpha = 0; |
| 193 header.ncolors = cinfo->output_components; |
| 194 for (ci = 0; ci < cinfo->output_components; ci++) { |
| 195 RLE_SET_BIT(header, ci); |
| 196 } |
| 197 if (cinfo->quantize_colors) { |
| 198 header.ncmap = cinfo->out_color_components; |
| 199 header.cmaplen = CMAPBITS; |
| 200 header.cmap = dest->colormap; |
| 201 /* Add a comment to the output image with the true colormap length. */ |
| 202 sprintf(cmapcomment, "color_map_length=%d", cinfo->actual_number_of_colors); |
| 203 rle_putcom(cmapcomment, &header); |
| 204 } |
| 205 |
| 206 /* Emit the RLE header and color map (if any) */ |
| 207 rle_put_setup(&header); |
| 208 |
| 209 /* Now output the RLE data from our virtual array. |
| 210 * We assume here that (a) rle_pixel is represented the same as JSAMPLE, |
| 211 * and (b) we are not on a machine where FAR pointers differ from regular. |
| 212 */ |
| 213 |
| 214 #ifdef PROGRESS_REPORT |
| 215 if (progress != NULL) { |
| 216 progress->pub.pass_limit = cinfo->output_height; |
| 217 progress->pub.pass_counter = 0; |
| 218 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 219 } |
| 220 #endif |
| 221 |
| 222 if (cinfo->output_components == 1) { |
| 223 for (row = cinfo->output_height-1; row >= 0; row--) { |
| 224 rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray) |
| 225 ((j_common_ptr) cinfo, dest->image, |
| 226 (JDIMENSION) row, (JDIMENSION) 1, FALSE); |
| 227 rle_putrow(rle_row, (int) cinfo->output_width, &header); |
| 228 #ifdef PROGRESS_REPORT |
| 229 if (progress != NULL) { |
| 230 progress->pub.pass_counter++; |
| 231 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 232 } |
| 233 #endif |
| 234 } |
| 235 } else { |
| 236 for (row = cinfo->output_height-1; row >= 0; row--) { |
| 237 rle_row = (rle_pixel **) dest->rle_row; |
| 238 output_row = * (*cinfo->mem->access_virt_sarray) |
| 239 ((j_common_ptr) cinfo, dest->image, |
| 240 (JDIMENSION) row, (JDIMENSION) 1, FALSE); |
| 241 red = rle_row[0]; |
| 242 green = rle_row[1]; |
| 243 blue = rle_row[2]; |
| 244 for (col = cinfo->output_width; col > 0; col--) { |
| 245 *red++ = GETJSAMPLE(*output_row++); |
| 246 *green++ = GETJSAMPLE(*output_row++); |
| 247 *blue++ = GETJSAMPLE(*output_row++); |
| 248 } |
| 249 rle_putrow(rle_row, (int) cinfo->output_width, &header); |
| 250 #ifdef PROGRESS_REPORT |
| 251 if (progress != NULL) { |
| 252 progress->pub.pass_counter++; |
| 253 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| 254 } |
| 255 #endif |
| 256 } |
| 257 } |
| 258 |
| 259 #ifdef PROGRESS_REPORT |
| 260 if (progress != NULL) |
| 261 progress->completed_extra_passes++; |
| 262 #endif |
| 263 |
| 264 /* Emit file trailer */ |
| 265 rle_puteof(&header); |
| 266 fflush(dest->pub.output_file); |
| 267 if (ferror(dest->pub.output_file)) |
| 268 ERREXIT(cinfo, JERR_FILE_WRITE); |
| 269 } |
| 270 |
| 271 |
| 272 /* |
| 273 * The module selection routine for RLE format output. |
| 274 */ |
| 275 |
| 276 GLOBAL(djpeg_dest_ptr) |
| 277 jinit_write_rle (j_decompress_ptr cinfo) |
| 278 { |
| 279 rle_dest_ptr dest; |
| 280 |
| 281 /* Create module interface object, fill in method pointers */ |
| 282 dest = (rle_dest_ptr) |
| 283 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 284 SIZEOF(rle_dest_struct)); |
| 285 dest->pub.start_output = start_output_rle; |
| 286 dest->pub.finish_output = finish_output_rle; |
| 287 |
| 288 /* Calculate output image dimensions so we can allocate space */ |
| 289 jpeg_calc_output_dimensions(cinfo); |
| 290 |
| 291 /* Allocate a work array for output to the RLE library. */ |
| 292 dest->rle_row = (*cinfo->mem->alloc_sarray) |
| 293 ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 294 cinfo->output_width, (JDIMENSION) cinfo->output_components); |
| 295 |
| 296 /* Allocate a virtual array to hold the image. */ |
| 297 dest->image = (*cinfo->mem->request_virt_sarray) |
| 298 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
| 299 (JDIMENSION) (cinfo->output_width * cinfo->output_components), |
| 300 cinfo->output_height, (JDIMENSION) 1); |
| 301 |
| 302 return (djpeg_dest_ptr) dest; |
| 303 } |
| 304 |
| 305 #endif /* RLE_SUPPORTED */ |
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