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/* base class for frequency filter create operations
*
* 02/01/14
* - from sines.c
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include "pcreate.h"
#include "point.h"
#include "pmask.h"
G_DEFINE_ABSTRACT_TYPE( VipsMask, vips_mask, VIPS_TYPE_POINT );
static float
vips_mask_point( VipsPoint *point, int x, int y )
{
VipsMask *mask = VIPS_MASK( point );
VipsMaskClass *class = VIPS_MASK_GET_CLASS( point );
int half_width = point->width / 2;
int half_height = point->height / 2;
double result;
/* Move centre for an optical transform mask.
*/
if( !mask->optical ) {
x = (x + half_width) % point->width;
y = (y + half_height) % point->height;
}
x = x - half_width;
y = y - half_height;
if( !mask->nodc &&
x == 0 &&
y == 0 )
/* DC component is always 1.
*/
result = 1.0;
else {
double dx, dy;
dx = (double) x / half_width;
dy = (double) y / half_height;
result = class->point( mask, dx, dy );
/* Invert filter sense for a highpass filter, or to swap
* band-pass for band-reject.
*/
if( mask->reject )
result = 1.0 - result;
}
return( result );
}
static void
vips_mask_class_init( VipsMaskClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
VipsPointClass *point_class = VIPS_POINT_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "mask";
vobject_class->description = _( "base class for frequency filters" );
point_class->point = vips_mask_point;
point_class->min = 0.0;
point_class->max = 1.0;
point_class->interpretation = VIPS_INTERPRETATION_FOURIER;
VIPS_ARG_BOOL( class, "optical", 5,
_( "Optical" ),
_( "Rotate quadrants to optical space" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsMask, optical ),
FALSE );
VIPS_ARG_BOOL( class, "reject", 5,
_( "Reject" ),
_( "Invert the sense of the filter" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsMask, reject ),
FALSE );
VIPS_ARG_BOOL( class, "nodc", 5,
_( "Nodc" ),
_( "Remove DC component" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsMask, nodc ),
FALSE );
}
static void
vips_mask_init( VipsMask *mask )
{
}
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