dll/3rdparty/libjpeg/wrrle.c

   1 /*
   2  * wrrle.c
   3  *
   4  * Copyright (C) 1991-1996, Thomas G. Lane.
   5  * Modified 2017 by Guido Vollbeding.
   6  * This file is part of the Independent JPEG Group's software.
   7  * For conditions of distribution and use, see the accompanying README file.
   8  *
   9  * This file contains routines to write output images in RLE format.
  10  * The Utah Raster Toolkit library is required (version 3.1 or later).
  11  *
  12  * These routines may need modification for non-Unix environments or
  13  * specialized applications.  As they stand, they assume output to
  14  * an ordinary stdio stream.
  15  *
  16  * Based on code contributed by Mike Lijewski,
  17  * with updates from Robert Hutchinson.
  18  */
  19
  20 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  21
  22 #ifdef RLE_SUPPORTED
  23
  24 /* rle.h is provided by the Utah Raster Toolkit. */
  25
  26 #include <rle.h>
  27
  28 /*
  29  * We assume that JSAMPLE has the same representation as rle_pixel,
  30  * to wit, "unsigned char".  Hence we can't cope with 12- or 16-bit samples.
  31  */
  32
  33 #if BITS_IN_JSAMPLE != 8
  34   Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
  35 #endif
  36
  37
  38 /*
  39  * Since RLE stores scanlines bottom-to-top, we have to invert the image
  40  * from JPEG's top-to-bottom order.  To do this, we save the outgoing data
  41  * in a virtual array during put_pixel_row calls, then actually emit the
  42  * RLE file during finish_output.
  43  */
  44
  45
  46 /*
  47  * For now, if we emit an RLE color map then it is always 256 entries long,
  48  * though not all of the entries need be used.
  49  */
  50
  51 #define CMAPBITS        8
  52 #define CMAPLENGTH      (1<<(CMAPBITS))
  53
  54 typedef struct {
  55   struct djpeg_dest_struct pub; /* public fields */
  56
  57   jvirt_sarray_ptr image;       /* virtual array to store the output image */
  58   rle_map *colormap;            /* RLE-style color map, or NULL if none */
  59   rle_pixel **rle_row;          /* To pass rows to rle_putrow() */
  60
  61 } rle_dest_struct;
  62
  63 typedef rle_dest_struct * rle_dest_ptr;
  64
  65 /* Forward declarations */
  66 METHODDEF(void) rle_put_pixel_rows
  67     JPP((j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
  68          JDIMENSION rows_supplied));
  69
  70
  71 /*
  72  * Write the file header.
  73  *
  74  * In this module it's easier to wait till finish_output to write anything.
  75  */
  76
  77 METHODDEF(void)
  78 start_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
  79 {
  80   rle_dest_ptr dest = (rle_dest_ptr) dinfo;
  81   size_t cmapsize;
  82   int i, ci;
  83 #ifdef PROGRESS_REPORT
  84   cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
  85 #endif
  86
  87   /*
  88    * Make sure the image can be stored in RLE format.
  89    *
  90    * - RLE stores image dimensions as *signed* 16 bit integers.  JPEG
  91    *   uses unsigned, so we have to check the width.
  92    *
  93    * - Colorspace is expected to be grayscale or RGB.
  94    *
  95    * - The number of channels (components) is expected to be 1 (grayscale/
  96    *   pseudocolor) or 3 (truecolor/directcolor).
  97    *   (could be 2 or 4 if using an alpha channel, but we aren't)
  98    */
  99
 100   if (cinfo->output_width > 32767 || cinfo->output_height > 32767)
 101     ERREXIT2(cinfo, JERR_RLE_DIMENSIONS, cinfo->output_width,
 102              cinfo->output_height);
 103
 104   if (cinfo->out_color_space != JCS_GRAYSCALE &&
 105       cinfo->out_color_space != JCS_RGB)
 106     ERREXIT(cinfo, JERR_RLE_COLORSPACE);
 107
 108   if (cinfo->output_components != 1 && cinfo->output_components != 3)
 109     ERREXIT1(cinfo, JERR_RLE_TOOMANYCHANNELS, cinfo->num_components);
 110
 111   /* Convert colormap, if any, to RLE format. */
 112
 113   dest->colormap = NULL;
 114
 115   if (cinfo->quantize_colors) {
 116     /* Allocate storage for RLE-style cmap, zero any extra entries */
 117     cmapsize = cinfo->out_color_components * CMAPLENGTH * SIZEOF(rle_map);
 118     dest->colormap = (rle_map *) (*cinfo->mem->alloc_small)
 119       ((j_common_ptr) cinfo, JPOOL_IMAGE, cmapsize);
 120     MEMZERO(dest->colormap, cmapsize);
 121
 122     /* Save away data in RLE format --- note 8-bit left shift! */
 123     /* Shifting would need adjustment for JSAMPLEs wider than 8 bits. */
 124     for (ci = 0; ci < cinfo->out_color_components; ci++) {
 125       for (i = 0; i < cinfo->actual_number_of_colors; i++) {
 126         dest->colormap[ci * CMAPLENGTH + i] =
 127           GETJSAMPLE(cinfo->colormap[ci][i]) << 8;
 128       }
 129     }
 130   }
 131
 132   /* Set the output buffer to the first row */
 133   dest->pub.buffer = (*cinfo->mem->access_virt_sarray)
 134     ((j_common_ptr) cinfo, dest->image, (JDIMENSION) 0, (JDIMENSION) 1, TRUE);
 135   dest->pub.buffer_height = 1;
 136
 137   dest->pub.put_pixel_rows = rle_put_pixel_rows;
 138
 139 #ifdef PROGRESS_REPORT
 140   if (progress != NULL) {
 141     progress->total_extra_passes++;  /* count file writing as separate pass */
 142   }
 143 #endif
 144 }
 145
 146
 147 /*
 148  * Write some pixel data.
 149  *
 150  * This routine just saves the data away in a virtual array.
 151  */
 152
 153 METHODDEF(void)
 154 rle_put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
 155                     JDIMENSION rows_supplied)
 156 {
 157   rle_dest_ptr dest = (rle_dest_ptr) dinfo;
 158
 159   if (cinfo->output_scanline < cinfo->output_height) {
 160     dest->pub.buffer = (*cinfo->mem->access_virt_sarray)
 161       ((j_common_ptr) cinfo, dest->image,
 162        cinfo->output_scanline, (JDIMENSION) 1, TRUE);
 163   }
 164 }
 165
 166 /*
 167  * Finish up at the end of the file.
 168  *
 169  * Here is where we really output the RLE file.
 170  */
 171
 172 METHODDEF(void)
 173 finish_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
 174 {
 175   rle_dest_ptr dest = (rle_dest_ptr) dinfo;
 176   rle_hdr header;               /* Output file information */
 177   rle_pixel **rle_row, *red, *green, *blue;
 178   JSAMPROW output_row;
 179   char cmapcomment[80];
 180   int row, col;
 181   int ci;
 182 #ifdef PROGRESS_REPORT
 183   cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
 184 #endif
 185
 186   /* Initialize the header info */
 187   header = *rle_hdr_init(NULL);
 188   header.rle_file = dest->pub.output_file;
 189   header.xmin     = 0;
 190   header.xmax     = cinfo->output_width  - 1;
 191   header.ymin     = 0;
 192   header.ymax     = cinfo->output_height - 1;
 193   header.alpha    = 0;
 194   header.ncolors  = cinfo->output_components;
 195   for (ci = 0; ci < cinfo->output_components; ci++) {
 196     RLE_SET_BIT(header, ci);
 197   }
 198   if (cinfo->quantize_colors) {
 199     header.ncmap   = cinfo->out_color_components;
 200     header.cmaplen = CMAPBITS;
 201     header.cmap    = dest->colormap;
 202     /* Add a comment to the output image with the true colormap length. */
 203     sprintf(cmapcomment, "color_map_length=%d", cinfo->actual_number_of_colors);
 204     rle_putcom(cmapcomment, &header);
 205   }
 206
 207   /* Emit the RLE header and color map (if any) */
 208   rle_put_setup(&header);
 209
 210   /* Now output the RLE data from our virtual array.
 211    * We assume here that (a) rle_pixel is represented the same as JSAMPLE,
 212    * and (b) we are not on a machine where FAR pointers differ from regular.
 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   JFFLUSH(dest->pub.output_file);
 268   if (JFERROR(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 &dest->pub;
 304 }
 305
 306 #endif /* RLE_SUPPORTED */