93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/* matrix catenate
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*
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* 1994, K. Martinez
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*
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* 22/10/10
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* - gtk-doc
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <string.h>
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#include <vips/vips.h>
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#include <vips/vips7compat.h>
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/**
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* im_matcat:
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* @top: input matrix
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* @bottom: input matrix
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* @filename: filename for output
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*
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* Matrix catenations. Returns a new matrix which is the two source matrices
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* joined together top-bottom. They must be the same width.
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*
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* See also: im_mattrn(), im_matmul(), im_matinv().
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*
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* Returns: the joined mask on success, or NULL on error.
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*/
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DOUBLEMASK *
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im_matcat( DOUBLEMASK *top, DOUBLEMASK *bottom, const char *filename )
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{
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int newxsize, newysize;
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DOUBLEMASK *mat;
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double *out;
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/* matrices must be same width
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*/
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if( top->xsize != bottom->xsize ) {
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im_error( "im_matcat", "%s",
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_( "matrices must be same width" ) );
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return( NULL );
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}
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newxsize = top->xsize;
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newysize = top->ysize + bottom->ysize;
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/* Allocate output matrix.
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*/
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if( !(mat = im_create_dmask( filename, newxsize, newysize )) )
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return( NULL );
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/* copy first matrix then add second on the end
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*/
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memcpy( mat->coeff, top->coeff,
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top->xsize * top->ysize * sizeof( double ) );
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out = mat->coeff + top->xsize * top->ysize;
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memcpy( out, bottom->coeff,
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bottom->xsize * bottom->ysize * sizeof( double ) );
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return( mat );
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}
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