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pbmpaste.c
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C/C++ Source or Header
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1980-12-04
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4KB
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150 lines
/* pbmpaste.c - paste a rectangle into a portable bitmap
**
** 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>
#else SYSV
#include <strings.h>
#endif SYSV
#include "pbm.h"
#define max(a,b) ((a) > (b) ? (a) : (b))
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd1, *ifd2;
register bit *bitrow1, **bits2, *b1P, *b2P;
int argn, rows1, cols1, format1, x, y, rows2, cols2, row, col;
char function;
char *usage = "[-replace|-or|-and|-xor] frompbmfile x y [intopbmfile]";
pm_progname = argv[0];
argn = 1;
function = 'r';
/* Check for flags. */
if ( argn < argc && argv[argn][0] == '-' )
{
if ( strncmp(argv[argn],"-replace",max(strlen(argv[argn]),2)) == 0 )
function = 'r';
else if ( strncmp(argv[argn],"-or",max(strlen(argv[argn]),2)) == 0 )
function = 'o';
else if ( strncmp(argv[argn],"-and",max(strlen(argv[argn]),2)) == 0 )
function = 'a';
else if ( strncmp(argv[argn],"-xor",max(strlen(argv[argn]),2)) == 0 )
function = 'x';
else
pm_usage( usage );
argn++;
}
if ( argn == argc )
pm_usage( usage );
ifd1 = pm_openr( argv[argn] );
pbm_readpbminit( ifd1, &cols1, &rows1, &format1 );
bitrow1 = pbm_allocrow( cols1 );
argn++;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &x ) != 1 )
pm_usage( usage );
argn++;
if ( argn == argc )
pm_usage( usage );
if ( sscanf( argv[argn], "%d", &y ) != 1 )
pm_usage( usage );
argn++;
if ( argn == argc )
ifd2 = stdin;
else
{
ifd2 = pm_openr( argv[argn] );
argn++;
}
bits2 = pbm_readpbm( ifd2, &cols2, &rows2 );
pm_close( ifd2 );
if ( x <= -cols2 )
pm_error(
"x is too negative -- the second bitmap has only %d cols",
cols2, 0,0,0,0 );
if ( y <= -rows2 )
pm_error(
"y is too negative -- the second bitmap has only %d rows",
rows2, 0,0,0,0 );
if ( x < 0 )
x = cols2 - x;
if ( y < 0 )
y = rows2 - y;
if ( x >= cols2 )
pm_error(
"x is too large -- the second bitmap has only %d cols",
cols2, 0,0,0,0 );
if ( y >= rows2 )
pm_error(
"y is too large -- the second bitmap has only %d rows",
rows2, 0,0,0,0 );
if ( x + cols1 > cols2 )
pm_error(
"x + width is too large by %d pixels", x + cols1 - cols2, 0,0,0,0 );
if ( y + rows1 > rows2 )
pm_error(
"y + height is too large by %d pixels", y + rows1 - rows2, 0,0,0,0);
if ( argn != argc )
pm_usage( usage );
for ( row = 0; row < rows1; row++ )
{
pbm_readpbmrow( ifd1, bitrow1, cols1, format1 );
for ( col = 0, b1P = bitrow1, b2P = &(bits2[row+y][x]); col < cols1; col++, b1P++, b2P++ )
switch ( function )
{
case 'r':
*b2P = *b1P;
break;
case 'o':
*b2P = ( *b1P == PBM_WHITE || *b2P == PBM_WHITE ?
PBM_WHITE : PBM_BLACK );
break;
case 'a':
*b2P = ( *b1P == PBM_WHITE && *b2P == PBM_WHITE ?
PBM_WHITE : PBM_BLACK );
break;
case 'x':
*b2P = ( ( *b1P == PBM_WHITE && *b2P != PBM_WHITE ) ||
( *b1P != PBM_WHITE && *b2P == PBM_WHITE ) ?
PBM_WHITE : PBM_BLACK );
break;
default:
pm_error( "can't happen", 0,0,0,0,0 );
}
}
pm_close( ifd1 );
pbm_writepbm( stdout, bits2, cols2, rows2 );
exit( 0 );
}