libvips/libsrc/iofuncs/im_wraptwo.c

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2008-01-22 11:17:55 +01:00
/* 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 <stdlib.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
typedef struct {
im_wraptwo_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
process_region( REGION *or, void *seq, void *unrequired, void *b )
{
if( im_prepare_many( (REGION**)seq, & or-> valid ))
return -1;
{
void *out= IM_REGION_ADDR_TOPLEFT( or );
void *in1= IM_REGION_ADDR( ((REGION**)seq)[0], or-> valid. left, or-> valid. top );
void *in2= IM_REGION_ADDR( ((REGION**)seq)[1], or-> valid. left, or-> valid. top );
size_t out_skip= IM_REGION_LSKIP( or );
size_t in1_skip= IM_REGION_LSKIP( ((REGION**)seq)[0] );
size_t in2_skip= IM_REGION_LSKIP( ((REGION**)seq)[1] );
void *out_stop= out + out_skip * or-> valid. height;
for( ; out < out_stop; out+= out_skip, in1+= in1_skip, in2+= in2_skip )
((UserBundle*) b)-> fn( in1, in2, out, or-> valid. width, ((UserBundle*) b)-> a, ((UserBundle*) b)-> b );
return 0;
}
}
/* Wrap up as a partial.
*/
int
im_wraptwo( IMAGE *in1, IMAGE *in2, IMAGE *out, im_wraptwo_fn fn, void *a, void *b )
{
if( im_pincheck( in1 ) || im_pincheck( in2 ) || im_poutcheck( out ))
return -1;
{
UserBundle *bun= IM_NEW( out, UserBundle );
IMAGE **ins= im_allocate_input_array( out, in1, in2, NULL );
if( ! bun || ! ins )
return -1;
bun-> fn= fn;
bun-> a= a;
bun-> b= b;
return im_demand_hint( out, IM_THINSTRIP, in1, in2, NULL )
|| im_generate( out, im_start_many, process_region, im_stop_many, (void*) ins, (void*) bun );
}
}