libvips/libsrc/conversion/im_bandjoin.c

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/* @(#) Function to perform a band-wise join of two images. If the two images
* @(#) have n and m bands respectively, then the output image will have n+m
* @(#) bands, with the first n coming from the first image and the last m
* @(#) from the second. Works for any image type.
* @(#)
* @(#) Function im_bandjoin() assumes that the imin image
* @(#) is either memory mapped or in the buffer pimin->data.
* @(#)
* @(#) int im_bandjoin(imin1, imin2, imout)
* @(#) IMAGE *imin1, *imin2, *imout;
* @(#)
* @(#) All functions return 0 on success and -1 on error
* @(#)
*
* Copyright: 1990, J. Cupitt
*
* Author: J. Cupitt
* Written on: 12/02/1990
* Modified on : 07/03/1991, by N. Dessipris, history removed
* 27/10/93 JC
* - adapted for partials
* - Nicos formatting removed
* - ANSIfied
*/
/*
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 <stdlib.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Bandjoin generate function.
*/
static int
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bandjoin_gen( REGION *or, void *seq, void *a, void *b )
{
REGION **ir = (REGION **) seq;
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Rect *r = &or->valid;
int le = r->left;
int ri = IM_RECT_RIGHT(r);
int to = r->top;
int bo = IM_RECT_BOTTOM(r);
int x, y, z;
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int i1s = IM_IMAGE_SIZEOF_PEL( ir[0]->im );
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int i2s = IM_IMAGE_SIZEOF_PEL( ir[1]->im );
/* Ask for input we need.
*/
if( im_prepare( ir[0], r ) )
return( -1 );
if( im_prepare( ir[1], r ) )
return( -1 );
/* Perform join.
*/
for( y = to; y < bo; y++ ) {
PEL *i1 = (PEL *) IM_REGION_ADDR( ir[0], le, y );
PEL *i2 = (PEL *) IM_REGION_ADDR( ir[1], le, y );
PEL *q = (PEL *) IM_REGION_ADDR( or, le, y );
for( x = le; x < ri; x++ ) {
/* Copy bytes from first file.
*/
for( z = 0; z < i1s; z++ )
*q++ = *i1++;
/* Copy bytes from in2.
*/
for( z = 0; z < i2s; z++ )
*q++ = *i2++;
}
}
return( 0 );
}
/* Join two images. out->Bands = in1->Bands + in2->Bands. in1 goes first in
* the list.
*/
int
im_bandjoin( IMAGE *in1, IMAGE *in2, IMAGE *out )
{
IMAGE **in;
/* Check our args.
*/
if( im_piocheck( in1, out ) )
return( -1 );
if( im_piocheck( in2, out ) )
return( -1 );
if( in1->Xsize != in2->Xsize ||
in1->Ysize != in2->Ysize ) {
im_errormsg( "im_bandjoin: images not same size" );
return( -1 );
}
if( in1->BandFmt != in2->BandFmt ) {
im_errormsg( "im_bandjoin: images not same type" );
return( -1 );
}
if( in1->Coding != IM_CODING_NONE || in2->Coding != IM_CODING_NONE ) {
im_errormsg( "im_bandjoin: input coded" );
return( -1 );
}
/* Set up the output header.
*/
if( im_cp_descv( out, in1, in2, NULL ) )
return( -1 );
out->Bands = in1->Bands + in2->Bands;
/* Set demand hints.
*/
if( im_demand_hint( out, IM_THINSTRIP, in1, in2, NULL ) )
return( -1 );
/* Make input array.
*/
if( !(in = im_allocate_input_array( out, in1, in2, NULL )) )
return( -1 );
/* Make output image.
*/
if( im_generate( out,
im_start_many, bandjoin_gen, im_stop_many, in, NULL ) )
return( -1 );
return( 0 );
}