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/* photographic negative ... just an example, really
*
* Copyright: 1990, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 12/02/1990
* Modified on :
* 7/7/93 JC
* - memory leaks fixed
* - adapted for partial v2
* - ANSIfied
* 22/2/95 JC
* - tidied up again
* 2/9/09
* - gtk-doc comment
* 23/8/11
* - rewrite as a class
* 7/12/12
* - only invert real part of complex
*/
/*
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 <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include "unary.h"
typedef VipsUnary VipsInvert;
typedef VipsUnaryClass VipsInvertClass;
G_DEFINE_TYPE( VipsInvert, vips_invert, VIPS_TYPE_UNARY );
#define LOOP( TYPE, L ) { \
TYPE * restrict p = (TYPE *) in[0]; \
TYPE * restrict q = (TYPE *) out; \
\
for( x = 0; x < sz; x++ ) \
q[x] = (L) - p[x]; \
}
#define LOOPN( TYPE ) { \
TYPE * restrict p = (TYPE *) in[0]; \
TYPE * restrict q = (TYPE *) out; \
\
for( x = 0; x < sz; x++ ) \
q[x] = -1 * p[x]; \
}
#define LOOPC( TYPE ) { \
TYPE * restrict p = (TYPE *) in[0]; \
TYPE * restrict q = (TYPE *) out; \
\
for( x = 0; x < sz; x++ ) { \
q[0] = -1 * p[0]; \
q[1] = p[1]; \
\
p += 2; \
q += 2; \
} \
}
static void
vips_invert_buffer( VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width )
{
VipsImage *im = arithmetic->ready[0];
const int sz = width * vips_image_get_bands( im );
int x;
switch( vips_image_get_format( im ) ) {
case VIPS_FORMAT_UCHAR:
LOOP( unsigned char, UCHAR_MAX ); break;
case VIPS_FORMAT_CHAR:
LOOPN( signed char ); break;
case VIPS_FORMAT_USHORT:
LOOP( unsigned short, USHRT_MAX ); break;
case VIPS_FORMAT_SHORT:
LOOPN( signed short ); break;
case VIPS_FORMAT_UINT:
LOOP( unsigned int, UINT_MAX ); break;
case VIPS_FORMAT_INT:
LOOPN( signed int ); break;
case VIPS_FORMAT_FLOAT:
LOOPN( float ); break;
case VIPS_FORMAT_DOUBLE:
LOOPN( double ); break;
case VIPS_FORMAT_COMPLEX:
LOOPC( float ); break;
case VIPS_FORMAT_DPCOMPLEX:
LOOPC( 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 invert.
*/
static const VipsBandFormat vips_invert_format_table[10] = {
/* UC C US S UI I F X D DX */
UC, C, US, S, UI, I, F, X, D, DX
};
static void
vips_invert_class_init( VipsInvertClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
object_class->nickname = "invert";
object_class->description = _( "invert an image" );
aclass->process_line = vips_invert_buffer;
vips_arithmetic_set_format_table( aclass, vips_invert_format_table );
}
static void
vips_invert_init( VipsInvert *invert )
{
}
/**
* vips_invert:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* For unsigned formats, this operation calculates (max - @in), eg. (255 -
* @in) for uchar. For signed and float formats, this operation calculates (-1
* @in).
*
* For complex images, only the real part is inverted. See also vips_conj().
*
* See also: vips_linear().
*
* Returns: 0 on success, -1 on error
*/
int
vips_invert( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "invert", ap, in, out );
va_end( ap );
return( result );
}
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