299 lines
6.9 KiB
C
299 lines
6.9 KiB
C
/* absolute value
|
|
*
|
|
* Copyright: 1990, N. Dessipris, based on im_powtra()
|
|
* Author: Nicos Dessipris
|
|
* Written on: 02/05/1990
|
|
* Modified on:
|
|
* 5/5/93 J.Cupitt
|
|
* - adapted from im_lintra to work with partial images
|
|
* - complex and signed support added
|
|
* 30/6/93 JC
|
|
* - adapted for partial v2
|
|
* - ANSI conversion
|
|
* - spe29873r6k3h()**!@lling errors removed
|
|
* 9/2/95 JC
|
|
* - adapted for im_wrap...
|
|
* 20/6/02 JC
|
|
* - tiny speed up
|
|
* 8/12/06
|
|
* - add liboil support
|
|
* 28/8/09
|
|
* - gtkdoc
|
|
* - tiny polish
|
|
* 31/7/10
|
|
* - remove liboil
|
|
* 6/11/11
|
|
* - redone as a class
|
|
* 3/12/13
|
|
* - add orc, though the speed improvement vs. gcc's auto-vectorizer
|
|
* seems very marginal
|
|
* 21/2/19
|
|
* - move orc init to first use of abs
|
|
*/
|
|
|
|
/*
|
|
|
|
Copyright (C) 1991-2005 The National Gallery
|
|
|
|
This library 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 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library 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 library; 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 DEBUG
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif /*HAVE_CONFIG_H*/
|
|
#include <glib/gi18n-lib.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#include <vips/vips.h>
|
|
|
|
#include "unary.h"
|
|
|
|
typedef VipsUnary VipsAbs;
|
|
typedef VipsUnaryClass VipsAbsClass;
|
|
|
|
G_DEFINE_TYPE( VipsAbs, vips_abs, VIPS_TYPE_UNARY );
|
|
|
|
static void *
|
|
vips_abs_orc_init_cb( void *a )
|
|
{
|
|
VipsAbs *abs = (VipsAbs *) a;
|
|
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_GET_CLASS( abs );
|
|
|
|
VipsVector *v;
|
|
|
|
vips_arithmetic_set_vector( aclass );
|
|
|
|
v = vips_arithmetic_get_program( aclass, VIPS_FORMAT_CHAR );
|
|
vips_vector_asm2( v, "absb", "d1", "s1" );
|
|
|
|
v = vips_arithmetic_get_program( aclass, VIPS_FORMAT_SHORT );
|
|
vips_vector_asm2( v, "absw", "d1", "s1" );
|
|
|
|
v = vips_arithmetic_get_program( aclass, VIPS_FORMAT_INT );
|
|
vips_vector_asm2( v, "absl", "d1", "s1" );
|
|
|
|
vips_arithmetic_compile( aclass );
|
|
|
|
return( NULL );
|
|
}
|
|
|
|
static int
|
|
vips_abs_build( VipsObject *object )
|
|
{
|
|
static GOnce once = G_ONCE_INIT;
|
|
|
|
VipsUnary *unary = (VipsUnary *) object;
|
|
|
|
VIPS_ONCE( &once, vips_abs_orc_init_cb, object );
|
|
|
|
if( unary->in &&
|
|
vips_band_format_isuint( unary->in->BandFmt ) )
|
|
return( vips_unary_copy( unary ) );
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_abs_parent_class )->build( object ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* Integer abs operation: just test and negate.
|
|
*/
|
|
#define ABS_INT( TYPE ) { \
|
|
TYPE * restrict p = (TYPE *) in[0]; \
|
|
TYPE * restrict q = (TYPE *) out; \
|
|
int x; \
|
|
\
|
|
for( x = 0; x < sz; x++ ) \
|
|
q[x] = p[x] < 0 ? 0 - p[x] : p[x]; \
|
|
}
|
|
|
|
/* Float abs operation: call fabs().
|
|
*/
|
|
#define ABS_FLOAT( TYPE ) { \
|
|
TYPE * restrict p = (TYPE *) in[0]; \
|
|
TYPE * restrict q = (TYPE *) out; \
|
|
int x; \
|
|
\
|
|
for( x = 0; x < sz; x++ ) \
|
|
q[x] = VIPS_FABS( p[x] ); \
|
|
}
|
|
|
|
/* Complex abs operation: calculate modulus.
|
|
*/
|
|
|
|
#ifdef HAVE_HYPOT
|
|
|
|
#define ABS_COMPLEX( TYPE ) { \
|
|
TYPE * restrict p = (TYPE *) in[0]; \
|
|
TYPE * restrict q = (TYPE *) out; \
|
|
int x; \
|
|
\
|
|
for( x = 0; x < sz; x++ ) { \
|
|
q[x] = hypot( p[0], p[1] ); \
|
|
p += 2; \
|
|
} \
|
|
}
|
|
|
|
#else /*HAVE_HYPOT*/
|
|
|
|
#define ABS_COMPLEX( TYPE ) { \
|
|
TYPE * restrict p = (TYPE *) in[0]; \
|
|
TYPE * restrict q = (TYPE *) out; \
|
|
int x; \
|
|
\
|
|
for( x = 0; x < sz; x++ ) { \
|
|
double rp = p[0]; \
|
|
double ip = p[1]; \
|
|
double abs_rp = VIPS_FABS( rp ); \
|
|
double abs_ip = VIPS_FABS( ip ); \
|
|
\
|
|
if( abs_rp > abs_ip ) { \
|
|
double temp = ip / rp; \
|
|
\
|
|
q[x] = abs_rp * sqrt( 1.0 + temp * temp ); \
|
|
} \
|
|
else { \
|
|
double temp = rp / ip; \
|
|
\
|
|
q[x] = abs_ip * sqrt( 1.0 + temp * temp ); \
|
|
} \
|
|
\
|
|
p += 2; \
|
|
} \
|
|
}
|
|
|
|
#endif /*HAVE_HYPOT*/
|
|
|
|
static void
|
|
vips_abs_buffer( VipsArithmetic *arithmetic,
|
|
VipsPel *out, VipsPel **in, int width )
|
|
{
|
|
VipsArithmeticClass *class = VIPS_ARITHMETIC_GET_CLASS( arithmetic );
|
|
VipsImage *im = arithmetic->ready[0];
|
|
const int bands = vips_image_get_bands( im );
|
|
int sz = width * bands;
|
|
|
|
VipsVector *v;
|
|
|
|
if( (v = vips_arithmetic_get_vector( class,
|
|
vips_image_get_format( im ) )) ) {
|
|
VipsExecutor ex;
|
|
|
|
vips_executor_set_program( &ex, v, sz );
|
|
vips_executor_set_array( &ex, v->s[0], in[0] );
|
|
vips_executor_set_destination( &ex, out );
|
|
|
|
vips_executor_run( &ex );
|
|
}
|
|
else {
|
|
switch( vips_image_get_format( im ) ) {
|
|
case VIPS_FORMAT_CHAR: ABS_INT( signed char ); break;
|
|
case VIPS_FORMAT_SHORT: ABS_INT( signed short ); break;
|
|
case VIPS_FORMAT_INT: ABS_INT( signed int ); break;
|
|
case VIPS_FORMAT_FLOAT: ABS_FLOAT( float ); break;
|
|
case VIPS_FORMAT_DOUBLE: ABS_FLOAT( double ); break;
|
|
case VIPS_FORMAT_COMPLEX: ABS_COMPLEX( float ); break;
|
|
case VIPS_FORMAT_DPCOMPLEX: ABS_COMPLEX( double ); break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Save a bit of typing.
|
|
*/
|
|
#define UC VIPS_FORMAT_UCHAR
|
|
#define C VIPS_FORMAT_CHAR
|
|
#define US VIPS_FORMAT_USHORT
|
|
#define S VIPS_FORMAT_SHORT
|
|
#define UI VIPS_FORMAT_UINT
|
|
#define I VIPS_FORMAT_INT
|
|
#define F VIPS_FORMAT_FLOAT
|
|
#define X VIPS_FORMAT_COMPLEX
|
|
#define D VIPS_FORMAT_DOUBLE
|
|
#define DX VIPS_FORMAT_DPCOMPLEX
|
|
|
|
/* Format doesn't change with abs, other than complex -> real.
|
|
*/
|
|
static const VipsBandFormat vips_abs_format_table[10] = {
|
|
/* Band format: UC C US S UI I F X D DX */
|
|
/* Promotion: */ UC, C, US, S, UI, I, F, F, D, D
|
|
};
|
|
|
|
static void
|
|
vips_abs_class_init( VipsAbsClass *class )
|
|
{
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
|
|
|
|
object_class->nickname = "abs";
|
|
object_class->description = _( "absolute value of an image" );
|
|
object_class->build = vips_abs_build;
|
|
|
|
aclass->process_line = vips_abs_buffer;
|
|
|
|
vips_arithmetic_set_format_table( aclass, vips_abs_format_table );
|
|
}
|
|
|
|
static void
|
|
vips_abs_init( VipsAbs *abs )
|
|
{
|
|
}
|
|
|
|
/**
|
|
* vips_abs: (method)
|
|
* @in: input #VipsImage
|
|
* @out: (out): output #VipsImage
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* This operation finds the absolute value of an image. It does a copy for
|
|
* unsigned integer types, negate for negative values in
|
|
* signed integer types, <function>fabs(3)</function> for
|
|
* float types, and calculates modulus for complex
|
|
* types.
|
|
*
|
|
* See also: vips_sign().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
vips_abs( VipsImage *in, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "abs", ap, in, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|