149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
/* base class for frequency filter create operations
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*
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* 02/01/14
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* - from sines.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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G_DEFINE_ABSTRACT_TYPE( VipsMask, vips_mask, VIPS_TYPE_POINT );
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static float
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vips_mask_point( VipsPoint *point, int x, int y )
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{
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VipsMask *mask = VIPS_MASK( point );
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VipsMaskClass *class = VIPS_MASK_GET_CLASS( point );
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/* VIPS_MAX to prevent /0.
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*/
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int half_width = VIPS_MAX( point->width / 2, 1 );
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int half_height = VIPS_MAX( point->height / 2, 1 );
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double result;
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/* Move centre for an optical transform mask.
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*/
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if( !mask->optical ) {
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x = (x + half_width) % point->width;
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y = (y + half_height) % point->height;
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}
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x = x - half_width;
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y = y - half_height;
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if( !mask->nodc &&
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x == 0 &&
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y == 0 )
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/* DC component is always 1.
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*/
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result = 1.0;
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else {
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double dx, dy;
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dx = (double) x / half_width;
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dy = (double) y / half_height;
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result = class->point( mask, dx, dy );
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/* Invert filter sense for a highpass filter, or to swap
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* band-pass for band-reject.
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*/
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if( mask->reject )
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result = 1.0 - result;
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}
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return( result );
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}
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static void
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vips_mask_class_init( VipsMaskClass *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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VipsPointClass *point_class = VIPS_POINT_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";
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vobject_class->description = _( "base class for frequency filters" );
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point_class->point = vips_mask_point;
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point_class->min = 0.0;
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point_class->max = 1.0;
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point_class->interpretation = VIPS_INTERPRETATION_FOURIER;
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VIPS_ARG_BOOL( class, "optical", 5,
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_( "Optical" ),
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_( "Rotate quadrants to optical space" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsMask, optical ),
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FALSE );
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VIPS_ARG_BOOL( class, "reject", 5,
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_( "Reject" ),
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_( "Invert the sense of the filter" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsMask, reject ),
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FALSE );
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VIPS_ARG_BOOL( class, "nodc", 5,
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_( "Nodc" ),
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_( "Remove DC component" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsMask, nodc ),
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FALSE );
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}
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static void
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vips_mask_init( VipsMask *mask )
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{
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}
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