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