rletoppm.c

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/*
 * This software is copyrighted as noted below.  It may be freely copied,
 * modified, and redistributed, provided that the copyright notice is
 * preserved on all copies.
 *
 * There is no warranty or other guarantee of fitness for this software,
 * it is provided solely "as is".  Bug reports or fixes may be sent
 * to the author, who may or may not act on them as he desires.
 *
 * You may not include this software in a program or other software product
 * without supplying the source, or without informing the end-user that the
 * source is available for no extra charge.
 *
 * If you modify this software, you should include a notice giving the
 * name of the person performing the modification, the date of modification,
 * and the reason for such modification.
 */
/*
 * rletoppm - A conversion program to go from Utah's "rle" image format to
 *            pbmplus ppm true color image format.
 *
 * Author:      Wesley C. Barris
 *              AHPCRC
 *              Minnesota Supercomputer Center, Inc.
 * Date:        Fri July 20 1990
 * Copyright (c) Wesley C. Barris
 */
#ifndef lint
static char rcsid[] = "$Header: /l/spencer/src/urt/cnv/RCS/rletoppm.c,v 3.0.1.4 1992/03/04 19:30:10 spencer Exp $";
#endif
#if 0
rletoppm()          /* Tag. */
#endif
/*-----------------------------------------------------------------------------
 * System includes.
 */

#define NO_DECLARE_MALLOC       /* ppm.h does it */
#include "rle.h"
#include "ppm.h"
#include <stdio.h>

#define VPRINTF if (verbose || header) fprintf
#define GRAYSCALE   001 /* 8 bits, no colormap */
#define PSEUDOCOLOR 010 /* 8 bits, colormap */
#define TRUECOLOR   011 /* 24 bits, colormap */
#define DIRECTCOLOR 100 /* 24 bits, no colormap */
/*
 * PBMPLUS type declarations.
 */
pixval  maxval  = 255;
/*
 * Utah type declarations.
 */
rle_hdr     hdr;
rle_map     *colormap;
/*
 * Other declarations.
 */
FILE        *fpin;
int     visual, maplen;
int     width, height;
int     verbose = 0, header = 0;
int     plain = 0;
/*-----------------------------------------------------------------------------
 *                                                         Read the rle header.
 */
void read_rle_header()
{
   int  i;
   hdr.rle_file = fpin;
   rle_get_setup(&hdr);
   width = hdr.xmax - hdr.xmin + 1;
   height = hdr.ymax - hdr.ymin + 1;
   VPRINTF(stderr, "Image size: %dx%d\n", width, height);
   if (hdr.ncolors == 1 && hdr.ncmap == 3) {
      visual = PSEUDOCOLOR;
      colormap = hdr.cmap;
      maplen = (1 << hdr.cmaplen);
      VPRINTF(stderr, "Mapped color image with a map of length %d.\n", maplen);
      }
   else if (hdr.ncolors == 3 && hdr.ncmap == 0) {
      visual = DIRECTCOLOR;
      VPRINTF(stderr, "24 bit color image, no colormap.\n");
      }
   else if (hdr.ncolors == 3 && hdr.ncmap == 3) {
      visual = TRUECOLOR;
      colormap = hdr.cmap;
      maplen = (1 << hdr.cmaplen);
      VPRINTF(stderr, "24 bit color image with color map of length %d\n" ,maplen);
      }
   else if (hdr.ncolors == 1 && hdr.ncmap == 0) {
      visual = GRAYSCALE;
      VPRINTF(stderr, "Grayscale image.\n");
      }
   else {
      fprintf(stderr,
              "ncolors = %d, ncmap = %d, I don't know how to handle this!\n",
              hdr.ncolors, hdr.ncmap);
      exit(-1);
      }
   if (hdr.alpha == 0)
      VPRINTF(stderr, "No alpha channel.\n");
   else if (hdr.alpha == 1)
      VPRINTF(stderr, "Alpha channel exists!\n");
   else {
      fprintf(stderr, "alpha = %d, I don't know how to handle this!\n",
              hdr.alpha);
      exit(-1);
      }
   switch (hdr.background) {
      case 0:
         VPRINTF(stderr, "Use all pixels, ignore background color.");
         break;
      case 1:
         VPRINTF(stderr,
                  "Use only non-background pixels, ignore background color.");
         break;
      case 2:
         VPRINTF(stderr,
        "Use only non-background pixels, clear to background color (default).");
         break;
      default:
         VPRINTF(stderr, "Unknown background flag!\n");
         break;
      }
   for (i = 0; i < hdr.ncolors; i++)
      VPRINTF(stderr, " %d", hdr.bg_color[i]);
   if (hdr.ncolors == 1 && hdr.ncmap == 3) {
      VPRINTF(stderr, " (%d %d %d)\n",
              hdr.cmap[hdr.bg_color[0]]>>8,
              hdr.cmap[hdr.bg_color[0]+256]>>8,
              hdr.cmap[hdr.bg_color[0]+512]>>8);
      }
   else if (hdr.ncolors == 3 && hdr.ncmap == 3) {
      VPRINTF(stderr, " (%d %d %d)\n",
              hdr.cmap[hdr.bg_color[0]]>>8,
              hdr.cmap[hdr.bg_color[1]+256]>>8,
              hdr.cmap[hdr.bg_color[2]+512]>>8);
      }
   else
      VPRINTF(stderr, "\n");
   if (hdr.comments)
      for (i = 0; hdr.comments[i] != NULL; i++)
         VPRINTF(stderr, "%s\n", hdr.comments[i]);
}
/*-----------------------------------------------------------------------------
 *                                                    Write the ppm image data.
 */
void write_ppm_data()
{
   rle_pixel        ***scanlines, **scanline;
   register pixval  r, g, b;
   register pixel   *pixelrow, *pP;
   register int     scan, x, y;
/*
 *  Allocate some stuff.
 */
   pixelrow = ppm_allocrow(width);

   scanlines = (rle_pixel ***)malloc( height * sizeof(rle_pixel **) );
   RLE_CHECK_ALLOC( hdr.cmd, scanlines, "scanline pointers" );

   for ( scan = 0; scan < height; scan++ )
      RLE_CHECK_ALLOC( hdr.cmd, (rle_row_alloc(&hdr, &scanlines[scan]) >= 0),
               "pixel memory" );
/*
 * Loop through those scan lines.
 */
   for (scan = 0; scan < height; scan++)
      y = rle_getrow(&hdr, scanlines[height - scan - 1]);
   for (scan = 0; scan < height; scan++) {
      scanline = scanlines[scan];
      switch (visual) {
         case GRAYSCALE:    /* 8 bits without colormap */
        for (x = 0, pP = pixelrow; x < width; x++, pP++) {
           r = scanline[0][x];
           g = scanline[0][x];
           b = scanline[0][x];
           PPM_ASSIGN(*pP, r, g, b);
        }
        break;
         case TRUECOLOR:    /* 24 bits with colormap */
        for (x = 0, pP = pixelrow; x < width; x++, pP++) {
           r = colormap[scanline[0][x]]>>8;
           g = colormap[scanline[1][x]+256]>>8;
           b = colormap[scanline[2][x]+512]>>8;
           PPM_ASSIGN(*pP, r, g, b);
        }
        break;
         case DIRECTCOLOR:  /* 24 bits without colormap */
        for (x = 0, pP = pixelrow; x < width; x++, pP++) {
           r = scanline[0][x];
           g = scanline[1][x];
           b = scanline[2][x];
           PPM_ASSIGN(*pP, r, g, b);
        }
        break;
         case PSEUDOCOLOR:  /* 8 bits with colormap */
        for (x = 0, pP = pixelrow; x < width; x++, pP++) {
           r = colormap[scanline[0][x]]>>8;
           g = colormap[scanline[0][x]+256]>>8;
           b = colormap[scanline[0][x]+512]>>8;
           PPM_ASSIGN(*pP, r, g, b);
        }
        break;
         default:
        break;
      }
      /*
       * Write the scan line.
       */
      ppm_writeppmrow(stdout, pixelrow, width, maxval, plain);
   }                /* end of for scan = 0 to height */

   /* Free scanline memory. */
   for ( scan = 0; scan < height; scan++ )
      rle_row_free( &hdr, scanlines[scan] );
   free( scanlines );
}
/*-----------------------------------------------------------------------------
 *                               Convert a Utah rle file to a pbmplus ppm file.
 */
int
main(argc, argv)
int argc;
char **argv;
{
   char     *fname = NULL;
/*
 * Get those options.
 */
   if (!scanargs(argc,argv,
       "% v%- h%- p%- infile%s\n(\
\tConvert an RLE image to ppm  true color.\n\
\t-v\tVerbose -- print out progress.\n\
\t-h\tPrint RLE header information and exit.\n\
\t-p\tWrite output image in \"plain\" mode.)",
       &verbose,
       &header,
       &plain,
       &fname))
      exit(-1);
/*
 * Open the file.
 */
   /* Initialize header. */
   hdr = *rle_hdr_init( (rle_hdr *)NULL );
   rle_names( &hdr, cmd_name( argv ), fname, 0 );

   fpin = rle_open_f( hdr.cmd, fname, "r" );
/*
 * Read the rle file header.
 */
   read_rle_header();
   if (header)
      exit(0);
/*
 * Write the ppm file header.
 */
   ppm_writeppminit(stdout, width, height, maxval, plain);
/*
 * Write the rest of the ppm file.
 */
   write_ppm_data();
   fclose(fpin);

   return 0;
}