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/* test for monotonicity
*
* Author: John Cupitt
* Written on: 18/7/1995
* 17/9/96 JC
* - restrictions on Ps, Pm, Ph relaxed
* - restrictions on S, M, H relaxed
* 25/7/01 JC
* - patched for im_extract_band() change
* 11/7/04
* - generalised to im_tone_build_range() ... so you can use it for any
* image, not just LabS
* 26/3/10
* - cleanups
* - gtkdoc
* 20/9/13
* - redone 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 <vips/vips.h>
typedef struct _VipsHistIsmonotonic {
VipsOperation parent_instance;
VipsImage *in;
gboolean monotonic;
} VipsHistIsmonotonic;
typedef VipsOperationClass VipsHistIsmonotonicClass;
G_DEFINE_TYPE( VipsHistIsmonotonic, vips_hist_ismonotonic,
VIPS_TYPE_OPERATION );
static int
vips_hist_ismonotonic_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsHistIsmonotonic *ismonotonic = (VipsHistIsmonotonic *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 4 );
double m;
if( VIPS_OBJECT_CLASS( vips_hist_ismonotonic_parent_class )->
build( object ) )
return( -1 );
if( vips_check_hist( class->nickname, ismonotonic->in ) )
return( -1 );
if( ismonotonic->in->Xsize == 1 )
t[0] = vips_image_new_matrixv( 1, 2, -1.0, 1.0 );
else
t[0] = vips_image_new_matrixv( 2, 1, -1.0, 1.0 );
vips_image_set_double( t[0], "offset", 128 );
/* We want >=128 everywhere, ie. no -ve transitions.
*/
if( vips_conv( ismonotonic->in, &t[1], t[0],
"precision", VIPS_PRECISION_INTEGER,
NULL ) ||
vips_moreeq_const1( t[1], &t[2], 128, NULL ) ||
vips_min( t[2], &m, NULL ) )
return( -1 );
g_object_set( ismonotonic, "monotonic", (int) m == 255, NULL );
return( 0 );
}
static void
vips_hist_ismonotonic_class_init( VipsHistIsmonotonicClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "hist_ismonotonic";
object_class->description = _( "test for monotonicity" );
object_class->build = vips_hist_ismonotonic_build;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input histogram image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsHistIsmonotonic, in ) );
VIPS_ARG_BOOL( class, "monotonic", 2,
_( "Monotonic" ),
_( "true if in is monotonic" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsHistIsmonotonic, monotonic ),
FALSE );
}
static void
vips_hist_ismonotonic_init( VipsHistIsmonotonic *ismonotonic )
{
}
/**
* vips_hist_ismonotonic: (method)
* @in: lookup-table to test
* @out: (out): set non-zero if @in is monotonic
* @...: %NULL-terminated list of optional named arguments
*
* Test @in for monotonicity. @out is set non-zero if @in is monotonic.
*
* Returns: 0 on success, -1 on error
*/
int
vips_hist_ismonotonic( VipsImage *in, gboolean *out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "hist_ismonotonic", ap, in, out );
va_end( ap );
return( result );
}
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