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/* identity LUTs
*
* Copyright 1991, N. Dessipris.
*
* Author N. Dessipris
* Written on 11/03/1991
* Updated on:
* 18/6/93 JC
* - im_outcheck() call added
* - ANSIfied
* 24/8/94 JC
* - im_identity_ushort() added
* 24/3/10
* - gtkdoc
* 3/7/13
* - redo as a class
*/
/*
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
*/
#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 "pcreate.h"
typedef struct _VipsIdentity {
VipsCreate parent_instance;
int bands;
gboolean ushort;
int size;
} VipsIdentity;
typedef VipsCreateClass VipsIdentityClass;
G_DEFINE_TYPE( VipsIdentity, vips_identity, VIPS_TYPE_CREATE );
#define IDENTITY( TYPE ) { \
TYPE *q = (TYPE *) VIPS_REGION_ADDR( or, le, 0 ); \
\
for( x = le; x < ri; x++ ) { \
for( i = 0; i < identity->bands; i++ ) \
q[i] = x; \
\
q += identity->bands; \
} \
}
static int
vips_identity_gen( VipsRegion *or, void *seq, void *a, void *b,
gboolean *stop )
{
VipsIdentity *identity = (VipsIdentity *) a;
VipsRect *r = &or->valid;
int le = r->left;
int ri = VIPS_RECT_RIGHT( r );
int x, i;
if( identity->ushort ) {
IDENTITY( unsigned short );
}
else {
IDENTITY( unsigned char );
}
return( 0 );
}
static int
vips_identity_build( VipsObject *object )
{
VipsCreate *create = VIPS_CREATE( object );
VipsIdentity *identity = (VipsIdentity *) object;
if( VIPS_OBJECT_CLASS( vips_identity_parent_class )->build( object ) )
return( -1 );
vips_image_init_fields( create->out,
identity->ushort ? identity->size : 256, 1, identity->bands,
identity->ushort ? VIPS_FORMAT_USHORT : VIPS_FORMAT_UCHAR,
VIPS_CODING_NONE, VIPS_INTERPRETATION_HISTOGRAM,
1.0, 1.0 );
if( vips_image_pipelinev( create->out, VIPS_DEMAND_STYLE_ANY, NULL ) ||
vips_image_generate( create->out,
NULL, vips_identity_gen, NULL, identity, NULL ) )
return( -1 );
return( 0 );
}
static void
vips_identity_class_init( VipsIdentityClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "identity";
vobject_class->description =
_( "make a 1D image where pixel values are indexes" );
vobject_class->build = vips_identity_build;
VIPS_ARG_INT( class, "bands", 3,
_( "Bands" ),
_( "Number of bands in LUT" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIdentity, bands ),
1, 100000, 1 );
VIPS_ARG_BOOL( class, "ushort", 4,
_( "Ushort" ),
_( "Create a 16-bit LUT" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIdentity, ushort ),
FALSE );
VIPS_ARG_INT( class, "size", 5,
_( "Size" ),
_( "Size of 16-bit LUT" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIdentity, size ),
1, 65536, 65536 );
}
static void
vips_identity_init( VipsIdentity *identity )
{
identity->bands = 1;
identity->ushort = FALSE;
identity->size = 65536;
}
/**
* vips_identity:
* @out: (out): output image
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @bands: number of bands to create
* * @ushort: %TRUE for an unsigned short identity
* * @size: number of LUT elements for a ushort image
*
* Creates an identity lookup table, ie. one which will leave an image
* unchanged when applied with vips_maplut(). Each entry in the table has a
* value equal to its position.
*
* Use the arithmetic operations on these tables to make LUTs representing
* arbitrary functions.
*
* Normally LUTs are 8-bit. Set @ushort to create a 16-bit table.
*
* Normally 16-bit tables have 65536 entries. You can set this smaller with
* @size.
*
* See also: vips_xyz(), vips_maplut().
*
* Returns: 0 on success, -1 on error
*/
int
vips_identity( VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "identity", ap, out );
va_end( ap );
return( result );
}
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