libvips/libsrc/iofuncs/im_wrapone.c

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/* As im_wrapmany, but just allow one input and one output.
*
* The types become:
*
* int im_wrapone( IMAGE *in, IMAGE *out,
* im_wrapone_fn fn, void *a, void *b )
*
* where im_wrapone_fn has type:
*
* process_buffer( void *in, void *out, int n,
* void *a, void *b )
* 28/7/97 JC
* - amazing error ... failed if or and ir were different sizes
*/
/*
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*/
typedef struct {
im_wrapone_fn fn; /* Function we call */
void *a, *b; /* User values for function */
} UserBundle;
/* Build or->valid a line at a time from ir.
*/
static int
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process_region( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
UserBundle *bun = (UserBundle *) b;
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PEL *p, *q;
int y;
/* Prepare input region and make buffer pointers.
*/
if( im_prepare( ir, &or->valid ) )
return( -1 );
p = (PEL *) IM_REGION_ADDR( ir, or->valid.left, or->valid.top );
q = (PEL *) IM_REGION_ADDR( or, or->valid.left, or->valid.top );
/* Convert linewise.
*/
for( y = 0; y < or->valid.height; y++ ) {
bun->fn( p, q, or->valid.width, bun->a, bun->b );
p += IM_REGION_LSKIP( ir );
q += IM_REGION_LSKIP( or );
}
return( 0 );
}
/* Wrap up as a partial.
*/
int
im_wrapone( IMAGE *in, IMAGE *out, im_wrapone_fn fn, void *a, void *b )
{
UserBundle *bun = IM_NEW( out, UserBundle );
/* Save args.
*/
if( !bun )
return( -1 );
bun->fn = fn;
bun->a = a;
bun->b = b;
/* Check descriptors.
*/
if( im_piocheck( in, out ) )
return( -1 );
/* Hint demand style. Being a buffer processor, we are happiest with
* thin strips.
*/
if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
return( -1 );
/* Generate!
*/
if( im_generate( out,
im_start_one, process_region, im_stop_one,
in, bun ) )
return( -1 );
return( 0 );
}