188 lines
4.2 KiB
C
188 lines
4.2 KiB
C
/* im_sign.c
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*
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* 9/7/02 JC
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* - from im_cmulnorm
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* 9/9/09
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* - gtkdoc, tidies
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* 6/11/11
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* - redone as a class
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU 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 General Public License for more details.
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You should have received a copy of the GNU 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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/*
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#define 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 <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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#include "unary.h"
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typedef VipsUnary VipsSign;
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typedef VipsUnaryClass VipsSignClass;
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G_DEFINE_TYPE( VipsSign, vips_sign, VIPS_TYPE_UNARY );
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#define CSIGN( TYPE ) { \
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TYPE *p = (TYPE *) in; \
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TYPE *q = (TYPE *) out; \
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int x; \
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\
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for( x = 0; x < sz; x++ ) { \
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TYPE re = p[0]; \
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TYPE im = p[1]; \
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double fac = sqrt( re * re + im * im ); \
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\
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p += 2; \
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\
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if( fac == 0.0 ) { \
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q[0] = 0.0; \
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q[1] = 0.0; \
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} \
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else { \
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q[0] = re / fac; \
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q[1] = im / fac; \
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} \
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\
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q += 2; \
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} \
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}
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#define SIGN( TYPE ) { \
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TYPE *p = (TYPE *) in; \
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signed char *q = (signed char *) out; \
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int x; \
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\
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for( x = 0; x < sz; x++ ) { \
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TYPE v = p[x]; \
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\
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if( v > 0 ) \
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q[x] = 1; \
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else if( v == 0 ) \
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q[x] = 0; \
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else \
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q[x] = -1; \
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} \
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}
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static void
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vips_sign_buffer( VipsArithmetic *arithmetic, PEL *out, PEL **in, int width )
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{
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VipsUnary *unary = VIPS_UNARY( arithmetic );
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const int bands = vips_image_get_bands( unary->in );
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int sz = width * bands;
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switch( vips_image_get_format( unary->in ) ) {
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case VIPS_FORMAT_UCHAR: SIGN( unsigned char ); break;
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case VIPS_FORMAT_CHAR: SIGN( signed char ); break;
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case VIPS_FORMAT_USHORT: SIGN( unsigned short ); break;
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case VIPS_FORMAT_SHORT: SIGN( signed short ); break;
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case VIPS_FORMAT_UINT: SIGN( unsigned int ); break;
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case VIPS_FORMAT_INT: SIGN( signed int ); break;
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case VIPS_FORMAT_FLOAT: SIGN( float ); break;
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case VIPS_FORMAT_DOUBLE: SIGN( double ); break;
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case VIPS_FORMAT_COMPLEX: CSIGN( float ); break;
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case VIPS_FORMAT_DPCOMPLEX: CSIGN( double ); break;
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default:
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g_assert( 0 );
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}
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}
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/* Save a bit of typing.
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*/
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#define UC VIPS_FORMAT_UCHAR
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#define C VIPS_FORMAT_CHAR
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#define US VIPS_FORMAT_USHORT
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#define S VIPS_FORMAT_SHORT
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#define UI VIPS_FORMAT_UINT
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#define I VIPS_FORMAT_INT
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#define F VIPS_FORMAT_FLOAT
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#define X VIPS_FORMAT_COMPLEX
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#define D VIPS_FORMAT_DOUBLE
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#define DX VIPS_FORMAT_DPCOMPLEX
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static const VipsBandFormat vips_bandfmt_sign[10] = {
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/* UC C US S UI I F X D DX */
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C, C, C, C, C, C, C, X, C, DX
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};
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static void
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vips_sign_class_init( VipsSignClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
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object_class->nickname = "sign";
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object_class->description = _( "unit vector of pixel" );
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vips_arithmetic_set_format_table( aclass, vips_bandfmt_sign );
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aclass->process_line = vips_sign_buffer;
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}
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static void
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vips_sign_init( VipsSign *sign )
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{
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}
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/**
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* vips_sign:
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* @in: input image
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* @out: output image
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*
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* Finds the unit vector in the direction of the pixel value. For non-complex
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* images, it returns a signed char image with values -1, 0, and 1 for negative,
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* zero and positive pixels. For complex images, it returns a
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* complex normalised to length 1.
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*
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* See also: vips_abs().
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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_sign( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "sign", ap, in, out );
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va_end( ap );
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return( result );
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}
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