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PBM_PLUS
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ppmtops.c
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1980-12-04
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/* ppmtops.c - read a portable pixmap and produce a PostScript file
**
** Copyright (C) 1989 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include <stdio.h>
#ifdef SYSV
#include <string.h>
#define index strchr
#else SYSV
#include <strings.h>
#endif SYSV
#include "ppm.h"
#define max(a,b) ((a) > (b) ? (a) : (b))
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
register pixel *pixrow, *pP;
int argn, rows, cols, format, bps, padright, row, col;
pixval maxval;
float scale;
char name[100], *cp;
char *usage = "[-scale <x>] [ppmfile]";
pm_progname = argv[0];
argn = 1;
scale = 1.0;
/* Check for flags. */
while ( argn < argc && argv[argn][0] == '-' )
{
if ( strncmp(argv[argn],"-scale",max(strlen(argv[argn]),2)) == 0 )
{
argn++;
if ( argn == argc || sscanf( argv[argn], "%f", &scale ) != 1 )
pm_usage( usage );
}
else
pm_usage( usage );
argn++;
}
if ( argn < argc )
{
ifd = pm_openr( argv[argn] );
strcpy( name, argv[argn] );
if ( strcmp( name, "-" ) == 0 )
strcpy( name, "noname" );
if ( ( cp = index( name, '.' ) ) != 0 )
*cp = '\0';
argn++;
}
else
{
ifd = stdin;
strcpy( name, "noname" );
}
if ( argn != argc )
pm_usage( usage );
ppm_readppminit( ifd, &cols, &rows, &maxval, &format );
pixrow = ppm_allocrow( cols );
/* Figure out bps. */
bps = maxvaltobps( maxval );
/* Compute padding to round cols * bps up to the nearest multiple of 8. */
padright = ( ( cols * bps + 7 ) / 8 ) * 8 - cols * bps;
putinit( name, cols, rows, bps, scale );
for ( row = 0; row < rows; row++ )
{
ppm_readppmrow( ifd, pixrow, cols, maxval, format );
for ( col = 0, pP = pixrow; col < cols; col++, pP++ )
putpix( *pP );
for ( col = 0; col < padright; col++ )
putpix( maxval );
}
pm_close( ifd );
putrest( );
exit( 0 );
}
int
maxvaltobps( maxval )
pixval maxval;
{
switch ( maxval )
{
case 1:
return 1;
case 3:
return 2;
case 15:
return 4;
case 255:
return 8;
#ifdef notdef
case 7:
return 3;
case 31:
return 5;
case 63:
return 6;
case 127:
return 7;
#endif notdef
default:
pm_error( "maxval of %d is not supported", maxval, 0,0,0,0 );
/* NOTREACHED */
}
}
int bitspersample, item, bitsperitem, bitshift, itemsperline, items;
#define HSBUFSIZ 384
putinit( name, cols, rows, bps, scale )
char *name;
int cols, rows, bps;
float scale;
{
int scols, srows, llx, lly;
scols = cols * 0.96 + 0.5; /* 0.96 is the multiple of */
srows = rows * 0.96 + 0.5; /* 72/300 that is closest to 1 */
llx = 300 - ( scols / 2 );
lly = 400 - ( srows / 2 );
printf( "%%!PS-Adobe-2.0 EPSF-2.)\n" );
printf( "%%%%Creator: ppmtops\n" );
printf( "%%%%Title: %s.ps\n", name );
printf( "%%%%Pages: 1\n" );
printf(
"%%%%BoundingBox: %d %d %d %d\n", llx, lly, llx + scols, lly + srows );
printf( "%%%%EndComments\n" );
printf( "%%%%EndProlog\n" );
printf( "%%%%Page 1 1\n" );
printf( "/picstr %d string def\n", HSBUFSIZ );
printf( "gsave\n" );
printf( "%d %d translate\n", llx, lly );
printf( "%g %g scale\n", scale, scale );
printf( "%d %d scale\n", scols, srows );
printf( "%d %d %d\n", cols, rows, bps );
printf( "[ %d 0 0 -%d 0 %d ]\n", cols, rows, rows );
printf( "{ currentfile picstr readhexstring pop }\n" );
printf( "false 3\n" );
printf( "colorimage\n" );
bitspersample = bps;
itemsperline = items = 0;
item = 0;
bitsperitem = 0;
bitshift = 8 - bitspersample;
}
putitem( )
{
if ( itemsperline == 30 )
{
putchar( '\n' );
itemsperline = 0;
}
printf( "%02x", item );
itemsperline++;
items++;
item = 0;
bitsperitem = 0;
bitshift = 8 - bitspersample;
}
putpix( p )
pixel p;
{
putgray( PPM_GETR( p ) );
putgray( PPM_GETG( p ) );
putgray( PPM_GETB( p ) );
}
putgray( g )
pixval g;
{
if ( bitsperitem == 8 )
putitem( );
item += g << bitshift;
bitsperitem += bitspersample;
bitshift -= bitspersample;
}
putrest( )
{
if ( bitsperitem > 0 )
putitem( );
while ( items % HSBUFSIZ != 0 )
putitem( );
printf( "\n" );
printf( "grestore\n" );
printf( "showpage\n" );
printf( "%%%%Trailer\n" );
}