143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/* base class for all histogram operations
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*
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* properties:
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* - single output image
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; 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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/*
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#define DEBUG
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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 <vips/intl.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 <vips/internal.h>
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#include "phistogram.h"
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/**
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* SECTION: histogram
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* @short_description: find, manipulate and apply histograms and lookup tables
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* @stability: Stable
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* @see_also: <link linkend="libvips-image">image</link>
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* @include: vips/vips.h
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*
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* Histograms and look-up tables are 1xn or nx1 images, where n is less than
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* 256 or less than 65536, corresponding to 8- and 16-bit unsigned int images.
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* They are
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* tagged with a #VipsType of IM_TYPE_HISTOGRAM and usually displayed by
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* user-interfaces such as nip2 as plots rather than images.
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*
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* These functions can be broadly grouped as things to find or build
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* histograms (im_histgr(), im_buildlut(), in_identity()), operations that
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* manipulate histograms in some way (im_histcum(), im_histnorm()), operations
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* to apply histograms (im_maplut()), and a variety of utility
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* operations.
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*
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* A final group of operations build tone curves. These are useful in
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* pre-press work for adjusting the appearance of images. They are designed
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* for CIELAB images, but might be useful elsewhere.
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*/
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G_DEFINE_ABSTRACT_TYPE( VipsHistogram, vips_histogram, VIPS_TYPE_OPERATION );
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static int
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vips_histogram_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsHistogram *histogram = VIPS_HISTOGRAM( object );
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#ifdef DEBUG
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printf( "vips_histogram_build: " );
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vips_object_print_name( object );
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printf( "\n" );
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#endif /*DEBUG*/
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g_object_set( histogram, "out", vips_image_new(), NULL );
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if( VIPS_OBJECT_CLASS( vips_histogram_parent_class )->build( object ) )
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return( -1 );
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if( vips_check_hist( class->nickname, histogram->in ) )
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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_histogram_class_init( VipsHistogramClass *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 = "histogram";
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vobject_class->description = _( "histogram operations" );
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vobject_class->build = vips_histogram_build;
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VIPS_ARG_IMAGE( class, "in", 0,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsHistogram, in ) );
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VIPS_ARG_IMAGE( class, "out", 1,
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_( "Output" ),
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_( "Output image" ),
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VIPS_ARGUMENT_REQUIRED_OUTPUT,
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G_STRUCT_OFFSET( VipsHistogram, out ) );
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}
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static void
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vips_histogram_init( VipsHistogram *histogram )
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{
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}
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/* Called from iofuncs to init all operations in this dir. Use a plugin system
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* instead?
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*/
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void
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vips_histogram_operation_init( void )
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{
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extern GType vips_maplut_get_type( void );
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vips_maplut_get_type();
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}
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