rletorast.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.
 */
/* 
 * rletorast.c - Convert RLE to sun rasterfile.
 * 
 * Author:  Rod Bogart, John W. Peterson & Ed Falk (SMI)
 *      Computer Science Dept.
 *      University of Utah
 * Date:    Tue Nov  4 1986
 * Copyright (c) 1986 Rod Bogart
 * History:
 *   6 September 1990: Clark: fix colormap output when hrle_dflt_dr.ncolors == 1 and
 *                            hrle_dflt_dr.ncmap != 0 (i.e. pseudo_color image).
 *   10 September 1990: Clark: fix bug in pointer calculation (optr = image + ...).
 * 
 * Based on "tobw.c" by Spencer Thomas, and 
 * "rps" by Marc Majka (UBC Vision lab)
 *
 * If an input file isn't specified, it reads from stdin.  An output file
 * can be specified with -o (otherwise it writes to stdout).
 */
#include <stdio.h>
#include <math.h>
#include <rasterfile.h>
#include "rle.h"

typedef enum { GREY, GREY_ALPHA, COLOR, COLOR_ALPHA } Input_Type ;

void
main( argc, argv )
int argc;
char **argv;
{
    char       *infname = NULL,
               *outfname = NULL;
    FILE       *outfile = stdout;
    rle_hdr hdr;
    int     oflag = 0;
    int     y, ncol, nscan, nchan, nochan, i;
    unsigned char **scan;
    unsigned char *buffer;
    struct rasterfile header ;
    unsigned char *image ;
    Input_Type  input_type ;
    int     linebytes ;

    if ( scanargs( argc, argv,
        "% o%-outfile!s infile%s",
        &oflag, &outfname, &infname ) == 0 )
    exit( 1 );

    /* Open RLE file and get header information */
    /* Initialize header. */
    hdr = *rle_hdr_init( (rle_hdr *)NULL );
    rle_names( &hdr, cmd_name( argv ), infname, 0 );

    hdr.rle_file = rle_open_f( hdr.cmd, infname, "r" );
    rle_get_setup_ok( &hdr, NULL, NULL );

    if ( ( hdr.ncolors != 3 ) && ( hdr.ncolors != 1))
    {
    fprintf( stderr, "%s is not RGB or b&w image",
            infname ? infname : "stdin" );
    exit( 0 );
    }

    outfile = rle_open_f( "rletorast", outfname, "w" );

    /* 
     * Spencer trick: save space by sliding the input image over to the
     * left margin.
     */
    hdr.xmax -= hdr.xmin ;
    hdr.xmin = 0 ;
    ncol = hdr.xmax + 1;
    nscan = hdr.ymax - hdr.ymin + 1;
    nchan = hdr.ncolors + (hdr.alpha ? 1 : 0) ;

    if( hdr.alpha )
    {
      if( hdr.ncolors == 1 )
    input_type = GREY_ALPHA ;
      else
    input_type = COLOR_ALPHA ;
    }
    else
    {
      if( hdr.ncolors == 1 )
    input_type = GREY ;
      else
    input_type = COLOR ;
    }

    /* Allocate scanline memory */
    /*
     * buffer = space for one scanline of one color
     * scan = space for pointers to ncolors+alpha buffers
     * scan[i] = pointer to space for one scanline of one color
     */

    buffer = (unsigned char *)malloc( ncol );
    rle_row_alloc( &hdr, &scan );

    header.ras_magic = RAS_MAGIC ;
    header.ras_width = ncol ;
    header.ras_height = nscan ;
    switch(input_type)
    {
      case GREY: nochan = 1 ; break ;
      case COLOR: nochan = 3 ; break ;
      case GREY_ALPHA: case COLOR_ALPHA: nochan = 4 ; break ;
      default: nochan = 4; break;
    }
    header.ras_depth = 8 * nochan ;
    linebytes = header.ras_width * nochan ;
    linebytes += linebytes % 2 ;
    header.ras_length = linebytes * header.ras_height ;
    header.ras_type = RT_STANDARD ;
    if( hdr.ncmap != 0 )
    {
      header.ras_maptype = RMT_EQUAL_RGB ;
      header.ras_maplength = (1 << hdr.cmaplen) * 3 ;
    }
    else
    {
      header.ras_maptype = RMT_NONE ;
      header.ras_maplength = 0 ;
    }

    fwrite( &header, sizeof(header), 1, outfile );

    if( header.ras_maptype == RMT_EQUAL_RGB )
    {
      register rle_map *iptr ;
      unsigned char out ;
      register int chan;
      int nch, nco ;

      if( hdr.ncolors == 1 )
      {
    nch = 3 ;
    nco = (1 << hdr.cmaplen) ;
      }
      else
      {
    nch = 1 ;
    nco = header.ras_maplength ;
      }

      for(chan=0; chan<nch; ++chan)
      {
    iptr = hdr.cmap + (chan<<8) ;
    for(i=0; i<nco; ++i)
    {
      out = (*iptr++ + 0x80) >> 8 ;
      fwrite(&out, 1,1, outfile) ;
    }
      }
    }

    if( hdr.comments != NULL )
    {
      register CONST_DECL char **comment = hdr.comments ;
      while(*comment != NULL)
      {
    fprintf(stderr,"%s\n", *comment) ;
    ++comment ;
      }
    }

  image = (unsigned char *) malloc(linebytes * header.ras_height) ;

  if( hdr.background != 0 )
  {
    register int row,col,chan ;
    register unsigned char *ptr ;
    register int *bptr ;
    for(row=0; row<nscan; ++row)
    {
      ptr = image + row*linebytes ;
      for(col=ncol; --col >= 0; )
      {
    if( hdr.alpha )
      *ptr++ = 0 ;
    bptr = hdr.bg_color ;
    for(chan=hdr.ncolors; --chan >= 0; )
      *ptr++ = *bptr++ ;
      }
    }
  }



  while ( (y = rle_getrow( &hdr, scan )) <=
      hdr.ymax )
  {
    register unsigned char *optr, *a,*r,*g,*b ;
    register int col ;

    optr = image + (nscan-y-1+hdr.ymin)*linebytes ;
    switch( input_type )
    {
      case GREY:
    r = scan[RLE_RED] ;
    for(col=ncol; --col >= 0; )
      *optr++ = *r++ ;
    break ;

      case GREY_ALPHA:
    a = scan[RLE_ALPHA] ;
    r = scan[RLE_RED] ;
    for(col=ncol; --col >= 0; )
    {
      *optr++ = *a++ ;
      *optr++ = *optr++ = *optr++ = *r++ ;
    }
    break ;

      case COLOR:
    r = scan[RLE_RED] ;
    g = scan[RLE_GREEN] ;
    b = scan[RLE_BLUE] ;
    for(col=ncol; --col >= 0; )
    {
      *optr++ = *r++ ;
      *optr++ = *g++ ;
      *optr++ = *b++ ;
    }
    break ;

      case COLOR_ALPHA:
    a = scan[RLE_ALPHA] ;
    r = scan[RLE_RED] ;
    g = scan[RLE_GREEN] ;
    b = scan[RLE_BLUE] ;
    for(col=ncol; --col >= 0; )
    {
      *optr++ = *a++ ;
      *optr++ = *r++ ;
      *optr++ = *g++ ;
      *optr++ = *b++ ;
    }
    break ;
    }
  }
  fwrite(image, linebytes * header.ras_height, 1, outfile) ;

  exit( 0 );
}