/* base class for all unary operations
 *
 * 30/10/11
 * 	- from binary.c
 */

/*

	Copyright (C) 1991-2005 The National Gallery

	This library 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 2.1 of the License, or (at your option) any later version.

	This library 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 library; 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

 */

/*
#define DEBUG
 */

#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 "unary.h"

G_DEFINE_ABSTRACT_TYPE(VipsUnary, vips_unary, VIPS_TYPE_ARITHMETIC);

static int
vips_unary_build(VipsObject *object)
{
	VipsArithmetic *arithmetic = VIPS_ARITHMETIC(object);
	VipsUnary *unary = VIPS_UNARY(object);

	arithmetic->n = 1;
	arithmetic->in = (VipsImage **) vips_object_local_array(object, 1);
	arithmetic->in[0] = unary->in;
	if (arithmetic->in[0])
		g_object_ref(arithmetic->in[0]);

	if (VIPS_OBJECT_CLASS(vips_unary_parent_class)->build(object))
		return -1;

	return 0;
}

static void
vips_unary_class_init(VipsUnaryClass *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 = "unary";
	vobject_class->description = _("unary operations");
	vobject_class->build = vips_unary_build;

	/* Create properties.
	 */

	VIPS_ARG_IMAGE(class, "in", 1,
		_("Input"),
		_("Input image"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsUnary, in));
}

static void
vips_unary_init(VipsUnary *unary)
{
	/* Init our instance fields.
	 */
}

/* Call this before chaining up in _build() to make the operation fall back to
 * copy.
 */
int
vips_unary_copy(VipsUnary *unary)
{
	VipsArithmetic *arithmetic = VIPS_ARITHMETIC(unary);

	/* This isn't set by arith until build(), so we have to set
	 * again here.
	 *
	 * Should arith set out in _init()?
	 */
	g_object_set(unary, "out", vips_image_new(), NULL);

	return vips_image_write(unary->in, arithmetic->out);
}
