88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
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/* @(#) Creates a vasari fractal surface of a given dimension by
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* @(#) filtering white gaussian noise (function im_gaussnoise(3X))
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* @(#) using the function im_fltimage_freq(3X)
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* @(#)
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* @(#) Usage:
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* @(#) int im_fractsurf(im, frd, size)
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* @(#) double frd;
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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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*
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* Copyright: 1991, N. Dessipris.
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*
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* Author: N. Dessipris
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* Written on: 10/09/1991
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* Modified on:
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* 20/9/95 JC
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* - modernised, a little
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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 <stdarg.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/fmask.h> /* for MASK_FRACTAL_FLT */
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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_fractsurf( IMAGE *out, int size, double frd )
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{
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IMAGE *noise = im_open_local( out, "noise.v", "p" );
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if( !noise )
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return( -1 );
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if( frd <= 2.0 || frd >= 3.0 ) {
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im_errormsg( "im_fractsurf: dimension shuld be in (2,3)" );
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return( -1 );
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}
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if( im_gaussnoise( noise, size, size, 0.0, 1.0 ) )
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return( -1 );
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/* create the fractal filter mask, and perform filtering on noise
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* Note that the result is in im, stored as float since
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* the original noise is in float. It needs scaling for display
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*/
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if( im_flt_image_freq( noise, out, MASK_FRACTAL_FLT, frd ) )
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return( -1 );
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return( 0 );
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}
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