143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/* creates a fractal filter.
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*
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* 02/01/14
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* - from ideal.c
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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/*
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#define VIPS_DEBUG
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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 <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <string.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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#include "pcreate.h"
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#include "point.h"
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#include "pmask.h"
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typedef struct _VipsMaskFractal {
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VipsMask parent_instance;
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double fractal_dimension;
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} VipsMaskFractal;
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typedef VipsMaskClass VipsMaskFractalClass;
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G_DEFINE_TYPE( VipsMaskFractal, vips_mask_fractal,
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VIPS_TYPE_MASK );
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static double
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vips_mask_fractal_point( VipsMask *mask, double dx, double dy )
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{
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VipsMaskFractal *fractal = (VipsMaskFractal *) mask;
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double fd = (fractal->fractal_dimension - 4.0) / 2.0;
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double d2 = dx * dx + dy * dy;
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return( pow( d2, fd ) );
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}
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static void
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vips_mask_fractal_class_init( VipsMaskFractalClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsMaskClass *mask_class = VIPS_MASK_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "mask_fractal";
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vobject_class->description = _( "make fractal filter" );
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mask_class->point = vips_mask_fractal_point;
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VIPS_ARG_DOUBLE( class, "fractal_dimension", 8,
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_( "Fractal dimension" ),
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_( "Fractal dimension" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsMaskFractal, fractal_dimension ),
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2.0, 3.0, 2.5 );
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}
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static void
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vips_mask_fractal_init( VipsMaskFractal *fractal )
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{
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fractal->fractal_dimension = 2.5;
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}
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/**
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* vips_mask_fractal:
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* @out: (out): output image
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* @width: image size
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* @height: image size
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* @fractal_dimension: fractal dimension
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* @...: %NULL-terminated list of optional named arguments
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*
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* Optional arguments:
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*
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* * @nodc: don't set the DC pixel
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* * @reject: invert the filter sense
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* * @optical: coordinates in optical space
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* * @uchar: output a uchar image
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*
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* This operation should be used to create fractal images by filtering the
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* power spectrum of Gaussian white noise. See vips_gaussnoise().
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*
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* See also: vips_mask_ideal().
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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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vips_mask_fractal( VipsImage **out, int width, int height,
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double fractal_dimension, ... )
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{
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va_list ap;
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int result;
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va_start( ap, fractal_dimension );
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result = vips_call_split( "mask_fractal", ap, out, width, height,
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fractal_dimension );
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va_end( ap );
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return( result );
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}
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