139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/* square zone plate of size
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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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* 1/2/11
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* - gtk-doc
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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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/**
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* im_fzone:
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* @out: output image
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* @size: image size
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*
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* Create a one-band float image of size @size by @size pixels of a zone
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* plate. Pixels are in [-1, +1].
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*
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* See also: im_grey(), im_make_xy(), im_identity().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_fzone( IMAGE *out, 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( out ) )
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return( -1 );
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if( size <= 0 || (size % 2) != 0 ) {
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im_error( "im_zone", "%s",
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_( "size must be even and positive" ) );
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return( -1 );
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}
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/* Set up output out.
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*/
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im_initdesc( out, 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( out ) )
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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( out, 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, out, (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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/**
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* im_zone:
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* @out: output image
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* @size: image size
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*
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* Create a one-band uchar image of size @size by @size pixels of a zone
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* plate. Pixels are in [0, 255].
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*
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* See also: im_grey(), im_make_xy(), im_identity().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_zone( IMAGE *out, int size )
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{
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IMAGE *t[2];
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/* Change range to [0,255].
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*/
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if( im_open_local_array( out, t, 2, "im_grey", "p" ) ||
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im_fzone( t[0], size ) ||
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im_lintra( 127.5, t[0], 127.5, t[1] ) ||
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im_clip2fmt( t[1], out, IM_BANDFMT_UCHAR ) )
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return( -1 );
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return( 0 );
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}
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