117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/* @(#) Creates a 2 band IM_BANDFMT_UINT image of a specified size. Each pixel
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* @(#) has band 0 == x coordinate, band 1 == y coordinate.
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int
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* @(#) im_make_xy( image, xsize, ysize )
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* @(#) IMAGE *image;
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* @(#) int xsize, ysize;
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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*
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* 21/4/04
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* - from im_grey
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Generate function.
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*/
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static int
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make_xy_gen( REGION *or )
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{
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Rect *r = &or->valid;
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int le = r->left;
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int to = r->top;
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int ri = IM_RECT_RIGHT( r );
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int bo = IM_RECT_BOTTOM( r );
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int x, y;
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for( y = to; y < bo; y++ ) {
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unsigned int *q = (unsigned int *) IM_REGION_ADDR( or, le, y );
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for( x = le; x < ri; x++ ) {
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q[0] = x;
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q[1] = y;
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q += 2;
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}
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}
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return( 0 );
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}
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/* Make a two band image ... band 0 is x coordinates, band 1 is y
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* coordinates.
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*/
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int
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im_make_xy( IMAGE *out, const int xsize, const int ysize )
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{
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/* Check args.
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*/
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if( xsize <=0 || ysize <= 0 ) {
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im_errormsg( "im_make_xy: bad size" );
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return( -1 );
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}
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if( im_poutcheck( out ) )
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return( -1 );
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/* Set image.
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*/
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im_initdesc( out, xsize, ysize, 2, IM_BBITS_INT, IM_BANDFMT_UINT,
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IM_CODING_NONE, IM_TYPE_MULTIBAND, 1.0, 1.0, 0, 0 );
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/* Set hints - ANY is ok with us.
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*/
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if( im_demand_hint( out, IM_ANY, NULL ) )
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return( -1 );
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/* Generate image.
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*/
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if( im_generate( out, NULL, make_xy_gen, NULL, NULL, NULL ) )
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return( -1 );
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return( 0 );
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}
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