128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/* @(#) square zone plate of size
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* @(#) The center of the zone plate is at (xpos/2, ypos/2)
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int im_zone( image, size )
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* @(#) IMAGE *image;
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* @(#) int size;
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* @(#)
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* @(#) int im_fzone( image, size )
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* @(#) IMAGE *image;
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* @(#) int size;
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* @(#)
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* @(#) Returns 0 on sucess and -1 on error
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* @(#)
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* N. Dessipris 01/02/1991
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*
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* 22/7/93 JC
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* - externs removed
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* - im_outcheck() added
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* 30/8/95 JC
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* - modernized
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* - memory leaks fixed
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* - split into im_zone() and im_fzone()
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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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int
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im_fzone( IMAGE *image, int size )
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{
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int x, y;
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int i, j;
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float *buf;
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const int size2 = size/2;
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/* Check args.
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*/
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if( im_outcheck( image ) )
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return( -1 );
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if( size <= 0 || (size % 2) != 0 ) {
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im_errormsg( "im_zone: size must be even and positive" );
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return( -1 );
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}
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/* Set up output image.
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*/
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im_initdesc( image, size, size, 1, IM_BBITS_FLOAT, IM_BANDFMT_FLOAT,
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IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 );
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if( im_setupout( image ) )
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return( -1 );
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/* Create output buffer.
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*/
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if( !(buf = IM_ARRAY( image, size, float )) )
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return( -1 );
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/* Make zone plate.
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*/
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for( y = 0, j = -size2; j < size2; j++, y++ ) {
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for( x = 0, i = -size2; i < size2; i++, x++ )
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buf[x] = cos( (IM_PI/size) * (i*i + j*j) );
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if( im_writeline( y, image, (PEL *) buf ) )
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return( -1 );
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}
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return( 0 );
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}
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/* As above, but make a IM_BANDFMT_UCHAR image.
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*/
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int
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im_zone( IMAGE *im, int size )
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{
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IMAGE *t1 = im_open_local( im, "im_zone:1", "p" );
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IMAGE *t2 = im_open_local( im, "im_zone:2", "p" );
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if( !t1 || !t2 )
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return( -1 );
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if( im_fzone( t1, size ) ||
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im_lintra( 127.5, t1, 127.5, t2 ) ||
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im_clip( t2, im ) )
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return( -1 );
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return( 0 );
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}
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