libvips/libsrc/other/im_make_xy.c

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2007-08-29 18:23:50 +02:00
/* @(#) Creates a 2 band IM_BANDFMT_UINT image of a specified size. Each pixel
* @(#) has band 0 == x coordinate, band 1 == y coordinate.
* @(#)
* @(#) Usage:
* @(#)
* @(#) int
* @(#) im_make_xy( image, xsize, ysize )
* @(#) IMAGE *image;
* @(#) int xsize, ysize;
* @(#)
* @(#) Returns 0 on success and -1 on error
* @(#)
*
* 21/4/04
* - from im_grey
*/
/*
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 <math.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Generate function.
*/
static int
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make_xy_gen( REGION *or, void *seq, void *a, void *b )
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{
Rect *r = &or->valid;
int le = r->left;
int to = r->top;
int ri = IM_RECT_RIGHT( r );
int bo = IM_RECT_BOTTOM( r );
int x, y;
for( y = to; y < bo; y++ ) {
unsigned int *q = (unsigned int *) IM_REGION_ADDR( or, le, y );
for( x = le; x < ri; x++ ) {
q[0] = x;
q[1] = y;
q += 2;
}
}
return( 0 );
}
/* Make a two band image ... band 0 is x coordinates, band 1 is y
* coordinates.
*/
int
im_make_xy( IMAGE *out, const int xsize, const int ysize )
{
/* Check args.
*/
if( xsize <=0 || ysize <= 0 ) {
im_errormsg( "im_make_xy: bad size" );
return( -1 );
}
if( im_poutcheck( out ) )
return( -1 );
/* Set image.
*/
im_initdesc( out, xsize, ysize, 2, IM_BBITS_INT, IM_BANDFMT_UINT,
IM_CODING_NONE, IM_TYPE_MULTIBAND, 1.0, 1.0, 0, 0 );
/* Set hints - ANY is ok with us.
*/
if( im_demand_hint( out, IM_ANY, NULL ) )
return( -1 );
/* Generate image.
*/
if( im_generate( out, NULL, make_xy_gen, NULL, NULL, NULL ) )
return( -1 );
return( 0 );
}