libvips/libsrc/matrix/im_matcat.c

89 lines
2.2 KiB
C

/* @(#) combine two masks. Result mask is made and returned.
* @(#) Pass in the name to set in the creation of the mask.
* @(#) DOUBLEMASK *
* @(#) im_matcat( in1, in2, name );
* @(#) DOUBLEMASK *in1, *in2;
* @(#) char *name;
* @(#)
* @(#) return NULL for error.
*
* 1994, K. Martinez
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <string.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* MATRIX concatenate (join columns ie add mask to bottom of another)
*/
DOUBLEMASK *
im_matcat( DOUBLEMASK *in1, DOUBLEMASK *in2, const char *name )
{
int newxsize, newysize;
DOUBLEMASK *mat;
double *out;
/* matrices must be same width
*/
if( in1->xsize != in2->xsize ) {
im_errormsg( "im_matcat: matrices must be same width" );
return( NULL );
}
newxsize = in1->xsize;
newysize = in1->ysize + in2->ysize;
/* Allocate output matrix.
*/
if( !(mat = im_create_dmask( name, newxsize, newysize )) ) {
im_errormsg( "im_matcat: unable to allocate output matrix" );
return( NULL );
}
/* copy first matrix then add second on the end
*/
memcpy( mat->coeff, in1->coeff,
in1->xsize * in1->ysize * sizeof( double ) );
out = mat->coeff + in1->xsize * in1->ysize;
memcpy( out, in2->coeff,
in2->xsize * in2->ysize * sizeof( double ) );
return( mat );
}