1 /* 2 * wrrle.c 3 * 4 * This file was part of the Independent JPEG Group's software: 5 * Copyright (C) 1991-1996, Thomas G. Lane. 6 * It was modified by The libjpeg-turbo Project to include only code and 7 * information relevant to libjpeg-turbo. 8 * For conditions of distribution and use, see the accompanying README file. 9 * 10 * This file contains routines to write output images in 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 output to 15 * an ordinary stdio stream. 16 * 17 * Based on code contributed by Mike Lijewski, 18 * with updates from Robert Hutchinson. 19 */ 20 21 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ 22 23 #ifdef RLE_SUPPORTED 24 25 /* rle.h is provided by the Utah Raster Toolkit. */ 26 27 #include <rle.h> 28 29 /* 30 * We assume that JSAMPLE has the same representation as rle_pixel, 31 * to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples. 32 */ 33 34 #if BITS_IN_JSAMPLE != 8 35 Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ 36 #endif 37 38 39 /* 40 * Since RLE stores scanlines bottom-to-top, we have to invert the image 41 * from JPEG's top-to-bottom order. To do this, we save the outgoing data 42 * in a virtual array during put_pixel_row calls, then actually emit the 43 * RLE file during finish_output. 44 */ 45 46 47 /* 48 * For now, if we emit an RLE color map then it is always 256 entries long, 49 * though not all of the entries need be used. 50 */ 51 52 #define CMAPBITS 8 53 #define CMAPLENGTH (1<<(CMAPBITS)) 54 55 typedef struct { 56 struct djpeg_dest_struct pub; /* public fields */ 57 58 jvirt_sarray_ptr image; /* virtual array to store the output image */ 59 rle_map *colormap; /* RLE-style color map, or NULL if none */ 60 rle_pixel **rle_row; /* To pass rows to rle_putrow() */ 61 62 } rle_dest_struct; 63 64 typedef rle_dest_struct * rle_dest_ptr; 65 66 /* Forward declarations */ 67 METHODDEF(void) rle_put_pixel_rows 68 (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, 69 JDIMENSION rows_supplied); 70 71 72 /* 73 * Write the file header. 74 * 75 * In this module it's easier to wait till finish_output to write anything. 76 */ 77 78 METHODDEF(void) 79 start_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) 80 { 81 rle_dest_ptr dest = (rle_dest_ptr) dinfo; 82 size_t cmapsize; 83 int i, ci; 84 #ifdef PROGRESS_REPORT 85 cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; 86 #endif 87 88 /* 89 * Make sure the image can be stored in RLE format. 90 * 91 * - RLE stores image dimensions as *signed* 16 bit integers. JPEG 92 * uses unsigned, so we have to check the width. 93 * 94 * - Colorspace is expected to be grayscale or RGB. 95 * 96 * - The number of channels (components) is expected to be 1 (grayscale/ 97 * pseudocolor) or 3 (truecolor/directcolor). 98 * (could be 2 or 4 if using an alpha channel, but we aren't) 99 */ 100 101 if (cinfo->output_width > 32767 || cinfo->output_height > 32767) 102 ERREXIT2(cinfo, JERR_RLE_DIMENSIONS, cinfo->output_width, 103 cinfo->output_height); 104 105 if (cinfo->out_color_space != JCS_GRAYSCALE && 106 cinfo->out_color_space != JCS_RGB) 107 ERREXIT(cinfo, JERR_RLE_COLORSPACE); 108 109 if (cinfo->output_components != 1 && cinfo->output_components != 3) 110 ERREXIT1(cinfo, JERR_RLE_TOOMANYCHANNELS, cinfo->num_components); 111 112 /* Convert colormap, if any, to RLE format. */ 113 114 dest->colormap = NULL; 115 116 if (cinfo->quantize_colors) { 117 /* Allocate storage for RLE-style cmap, zero any extra entries */ 118 cmapsize = cinfo->out_color_components * CMAPLENGTH * sizeof(rle_map); 119 dest->colormap = (rle_map *) (*cinfo->mem->alloc_small) 120 ((j_common_ptr) cinfo, JPOOL_IMAGE, cmapsize); 121 MEMZERO(dest->colormap, cmapsize); 122 123 /* Save away data in RLE format --- note 8-bit left shift! */ 124 /* Shifting would need adjustment for JSAMPLEs wider than 8 bits. */ 125 for (ci = 0; ci < cinfo->out_color_components; ci++) { 126 for (i = 0; i < cinfo->actual_number_of_colors; i++) { 127 dest->colormap[ci * CMAPLENGTH + i] = 128 GETJSAMPLE(cinfo->colormap[ci][i]) << 8; 129 } 130 } 131 } 132 133 /* Set the output buffer to the first row */ 134 dest->pub.buffer = (*cinfo->mem->access_virt_sarray) 135 ((j_common_ptr) cinfo, dest->image, (JDIMENSION) 0, (JDIMENSION) 1, TRUE); 136 dest->pub.buffer_height = 1; 137 138 dest->pub.put_pixel_rows = rle_put_pixel_rows; 139 140 #ifdef PROGRESS_REPORT 141 if (progress != NULL) { 142 progress->total_extra_passes++; /* count file writing as separate pass */ 143 } 144 #endif 145 } 146 147 148 /* 149 * Write some pixel data. 150 * 151 * This routine just saves the data away in a virtual array. 152 */ 153 154 METHODDEF(void) 155 rle_put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, 156 JDIMENSION rows_supplied) 157 { 158 rle_dest_ptr dest = (rle_dest_ptr) dinfo; 159 160 if (cinfo->output_scanline < cinfo->output_height) { 161 dest->pub.buffer = (*cinfo->mem->access_virt_sarray) 162 ((j_common_ptr) cinfo, dest->image, 163 cinfo->output_scanline, (JDIMENSION) 1, TRUE); 164 } 165 } 166 167 /* 168 * Finish up at the end of the file. 169 * 170 * Here is where we really output the RLE file. 171 */ 172 173 METHODDEF(void) 174 finish_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) 175 { 176 rle_dest_ptr dest = (rle_dest_ptr) dinfo; 177 rle_hdr header; /* Output file information */ 178 rle_pixel **rle_row, *red, *green, *blue; 179 JSAMPROW output_row; 180 char cmapcomment[80]; 181 int row, col; 182 int ci; 183 #ifdef PROGRESS_REPORT 184 cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; 185 #endif 186 187 /* Initialize the header info */ 188 header = *rle_hdr_init(NULL); 189 header.rle_file = dest->pub.output_file; 190 header.xmin = 0; 191 header.xmax = cinfo->output_width - 1; 192 header.ymin = 0; 193 header.ymax = cinfo->output_height - 1; 194 header.alpha = 0; 195 header.ncolors = cinfo->output_components; 196 for (ci = 0; ci < cinfo->output_components; ci++) { 197 RLE_SET_BIT(header, ci); 198 } 199 if (cinfo->quantize_colors) { 200 header.ncmap = cinfo->out_color_components; 201 header.cmaplen = CMAPBITS; 202 header.cmap = dest->colormap; 203 /* Add a comment to the output image with the true colormap length. */ 204 sprintf(cmapcomment, "color_map_length=%d", cinfo->actual_number_of_colors); 205 rle_putcom(cmapcomment, &header); 206 } 207 208 /* Emit the RLE header and color map (if any) */ 209 rle_put_setup(&header); 210 211 /* Now output the RLE data from our virtual array. 212 * We assume here that rle_pixel is represented the same as JSAMPLE. 213 */ 214 215 #ifdef PROGRESS_REPORT 216 if (progress != NULL) { 217 progress->pub.pass_limit = cinfo->output_height; 218 progress->pub.pass_counter = 0; 219 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); 220 } 221 #endif 222 223 if (cinfo->output_components == 1) { 224 for (row = cinfo->output_height-1; row >= 0; row--) { 225 rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray) 226 ((j_common_ptr) cinfo, dest->image, 227 (JDIMENSION) row, (JDIMENSION) 1, FALSE); 228 rle_putrow(rle_row, (int) cinfo->output_width, &header); 229 #ifdef PROGRESS_REPORT 230 if (progress != NULL) { 231 progress->pub.pass_counter++; 232 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); 233 } 234 #endif 235 } 236 } else { 237 for (row = cinfo->output_height-1; row >= 0; row--) { 238 rle_row = (rle_pixel **) dest->rle_row; 239 output_row = * (*cinfo->mem->access_virt_sarray) 240 ((j_common_ptr) cinfo, dest->image, 241 (JDIMENSION) row, (JDIMENSION) 1, FALSE); 242 red = rle_row[0]; 243 green = rle_row[1]; 244 blue = rle_row[2]; 245 for (col = cinfo->output_width; col > 0; col--) { 246 *red++ = GETJSAMPLE(*output_row++); 247 *green++ = GETJSAMPLE(*output_row++); 248 *blue++ = GETJSAMPLE(*output_row++); 249 } 250 rle_putrow(rle_row, (int) cinfo->output_width, &header); 251 #ifdef PROGRESS_REPORT 252 if (progress != NULL) { 253 progress->pub.pass_counter++; 254 (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); 255 } 256 #endif 257 } 258 } 259 260 #ifdef PROGRESS_REPORT 261 if (progress != NULL) 262 progress->completed_extra_passes++; 263 #endif 264 265 /* Emit file trailer */ 266 rle_puteof(&header); 267 fflush(dest->pub.output_file); 268 if (ferror(dest->pub.output_file)) 269 ERREXIT(cinfo, JERR_FILE_WRITE); 270 } 271 272 273 /* 274 * The module selection routine for RLE format output. 275 */ 276 277 GLOBAL(djpeg_dest_ptr) 278 jinit_write_rle (j_decompress_ptr cinfo) 279 { 280 rle_dest_ptr dest; 281 282 /* Create module interface object, fill in method pointers */ 283 dest = (rle_dest_ptr) 284 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 285 sizeof(rle_dest_struct)); 286 dest->pub.start_output = start_output_rle; 287 dest->pub.finish_output = finish_output_rle; 288 289 /* Calculate output image dimensions so we can allocate space */ 290 jpeg_calc_output_dimensions(cinfo); 291 292 /* Allocate a work array for output to the RLE library. */ 293 dest->rle_row = (*cinfo->mem->alloc_sarray) 294 ((j_common_ptr) cinfo, JPOOL_IMAGE, 295 cinfo->output_width, (JDIMENSION) cinfo->output_components); 296 297 /* Allocate a virtual array to hold the image. */ 298 dest->image = (*cinfo->mem->request_virt_sarray) 299 ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, 300 (JDIMENSION) (cinfo->output_width * cinfo->output_components), 301 cinfo->output_height, (JDIMENSION) 1); 302 303 return (djpeg_dest_ptr) dest; 304 } 305 306 #endif /* RLE_SUPPORTED */ 307
