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