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pgmtops.c
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C/C++ Source or Header
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1980-12-04
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407 lines
/* pgmtops.c - read a portable graymap 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 "pgm.h"
#define max(a,b) ((a) > (b) ? (a) : (b))
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
register gray *grayrow, *gP;
int argn, rleflag, rows, cols, format, bps, padright, row, col;
gray maxval;
float scale;
char name[100], *cp;
int maxvaltobps();
char *usage = "[-rle] [-scale <x>] [pgmfile]";
pm_progname = argv[0];
argn = 1;
rleflag = 0;
scale = 1.0;
/* Check for flags. */
while ( argn < argc && argv[argn][0] == '-' )
{
if ( strncmp(argv[argn],"-rle",max(strlen(argv[argn]),2)) == 0 ||
strncmp(argv[argn],"-runlength",max(strlen(argv[argn]),2)) == 0 )
rleflag = 1;
else 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 );
pgm_readpgminit( ifd, &cols, &rows, &maxval, &format );
grayrow = pgm_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;
if ( rleflag )
rleputinit( name, cols, rows, bps, scale );
else
putinit( name, cols, rows, bps, scale );
for ( row = 0; row < rows; row++ )
{
pgm_readpgmrow( ifd, grayrow, cols, maxval, format );
for ( col = 0, gP = grayrow; col < cols; col++, gP++ )
if ( rleflag )
rleputgray( *gP );
else
putgray( *gP );
for ( col = 0; col < padright; col++ )
if ( rleflag )
rleputgray( maxval );
else
putgray( maxval );
}
pm_close( ifd );
if ( rleflag )
rleputrest( );
else
putrest( );
exit( 0 );
}
int
maxvaltobps( maxval )
gray 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;
int rleitem, rlebitsperitem, rlebitshift;
int repeat, itembuf[128], count, repeatitem, repeatcount;
#define HSBUFSIZ 256
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-2.0\n" );
printf( "%%%%Creator: pgmtops\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( "image\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;
}
putgray( g )
gray 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" );
}
rleputinit( 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-2.0\n" );
printf( "%%%%Creator: pgmtops\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( "/rlestr1 1 string def\n" );
printf( "/rlestr 128 string def\n" );
printf( "/readrlestring {\n" );
printf( " currentfile rlestr1 readhexstring pop 0 get\n" );
printf( " dup 127 le {\n" );
printf( " currentfile rlestr 0 4 3 roll 1 add getinterval\n" );
printf( " readhexstring pop\n" );
printf( " } {\n" );
printf( " 256 exch sub dup\n" );
printf( " currentfile rlestr1 readhexstring pop 0 get\n" );
printf( " exch 0 exch 1 exch 1 sub { rlestr exch 2 index put } for\n" );
printf( " pop rlestr exch 0 exch getinterval\n" );
printf( " } ifelse\n" );
printf( "} bind def\n" );
printf( "%%%%EndProlog\n" );
printf( "%%%%Page 1 1\n" );
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( "{ readrlestring }\n" );
printf( "image\n" );
bitspersample = bps;
itemsperline = items = 0;
rleitem = 0;
rlebitsperitem = 0;
rlebitshift = 8 - bitspersample;
repeat = 1;
count = 0;
}
rleputbuffer( )
{
int i;
if ( repeat )
{
item = 256 - count;
putitem( );
item = repeatitem;
putitem( );
}
else
{
item = count - 1;
putitem( );
for ( i = 0; i < count; i++ )
{
item = itembuf[i];
putitem( );
}
}
repeat = 1;
count = 0;
}
rleputitem( )
{
int i;
if ( count == 128 )
rleputbuffer( );
if ( repeat && count == 0 )
{ /* Still initializing a repeat buf. */
itembuf[count] = repeatitem = rleitem;
count++;
}
else if ( repeat )
{ /* Repeating - watch for end of run. */
if ( rleitem == repeatitem )
{ /* Run continues. */
itembuf[count] = rleitem;
count++;
}
else
{ /* Run ended - is it long enough to dump? */
if ( count > 2 )
{ /* Yes, dump a repeat-mode buffer and start a new one. */
rleputbuffer( );
itembuf[count] = repeatitem = rleitem;
count++;
}
else
{ /* Not long enough - convert to non-repeat mode. */
repeat = 0;
itembuf[count] = repeatitem = rleitem;
count++;
repeatcount = 1;
}
}
}
else
{ /* Not repeating - watch for a run worth repeating. */
if ( rleitem == repeatitem )
{ /* Possible run continues. */
repeatcount++;
if ( repeatcount > 3 )
{ /* Long enough - dump non-repeat part and start repeat. */
count = count - ( repeatcount - 1 );
rleputbuffer( );
count = repeatcount;
for ( i = 0; i < count; i++ )
itembuf[i] = rleitem;
}
else
{ /* Not long enough yet - continue as non-repeat buf. */
itembuf[count] = rleitem;
count++;
}
}
else
{ /* Broken run. */
itembuf[count] = repeatitem = rleitem;
count++;
repeatcount = 1;
}
}
rleitem = 0;
rlebitsperitem = 0;
rlebitshift = 8 - bitsperitem;
}
rleputgray( g )
gray g;
{
if ( rlebitsperitem == 8 )
{
rleputitem( );
}
rleitem += g << rlebitshift;
rlebitsperitem += bitsperitem;
rlebitshift -= bitsperitem;
}
rleputrest( )
{
if ( rlebitsperitem > 0 )
rleputitem( );
if ( count > 0 )
rleputbuffer( );
printf( "\n" );
printf( "grestore\n" );
printf( "showpage\n" );
printf( "%%%%Trailer\n" );
}