/* fractal surface
 *
 * Author: N. Dessipris
 * Written on: 10/09/1991
 * Modified on:
 * 20/9/95 JC
 *	 - modernised, a little
 * 7/2/10
 * 	- cleanups
 * 	- gtkdoc
 * 4/1/14
 * 	- redo 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 <stdlib.h>

#include <vips/vips.h>

#include "pcreate.h"

typedef struct _VipsFractsurf {
	VipsCreate parent_instance;

	int width;
	int height;
	double fractal_dimension;

} VipsFractsurf;

typedef VipsCreateClass VipsFractsurfClass;

G_DEFINE_TYPE(VipsFractsurf, vips_fractsurf, VIPS_TYPE_CREATE);

static int
vips_fractsurf_build(VipsObject *object)
{
	VipsCreate *create = VIPS_CREATE(object);
	VipsFractsurf *fractsurf = (VipsFractsurf *) object;
	VipsImage **t = (VipsImage **) vips_object_local_array(object, 5);

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

	if (vips_gaussnoise(&t[0], fractsurf->width, fractsurf->height,
			"mean", 0.0,
			"sigma", 1.0,
			NULL) ||
		vips_mask_fractal(&t[1], fractsurf->width, fractsurf->height,
			fractsurf->fractal_dimension, NULL) ||
		vips_freqmult(t[0], t[1], &t[2], NULL) ||
		vips_image_write(t[2], create->out))
		return -1;

	return 0;
}

static void
vips_fractsurf_class_init(VipsFractsurfClass *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 = "fractsurf";
	vobject_class->description = _("make a fractal surface");
	vobject_class->build = vips_fractsurf_build;

	VIPS_ARG_INT(class, "width", 4,
		_("Width"),
		_("Image width in pixels"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsFractsurf, width),
		1, VIPS_MAX_COORD, 64);

	VIPS_ARG_INT(class, "height", 5,
		_("Height"),
		_("Image height in pixels"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsFractsurf, height),
		1, VIPS_MAX_COORD, 64);

	VIPS_ARG_DOUBLE(class, "fractal_dimension", 8,
		_("Fractal dimension"),
		_("Fractal dimension"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsFractsurf, fractal_dimension),
		2.0, 3.0, 2.5);
}

static void
vips_fractsurf_init(VipsFractsurf *fractsurf)
{
	fractsurf->width = 64;
	fractsurf->height = 64;
	fractsurf->fractal_dimension = 2.5;
}

/**
 * vips_fractsurf:
 * @out: (out): output image
 * @width: output width
 * @height: output height
 * @fractal_dimension: fractal dimension
 * @...: %NULL-terminated list of optional named arguments
 *
 * Generate an image of size @width by @height and fractal dimension
 * @fractal_dimension. The dimension should be between 2 and 3.
 *
 * See also: vips_gaussnoise(), vips_mask_fractal().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_fractsurf(VipsImage **out,
	int width, int height, double fractal_dimension, ...)
{
	va_list ap;
	int result;

	va_start(ap, fractal_dimension);
	result = vips_call_split("fractsurf", ap,
		out, width, height, fractal_dimension);
	va_end(ap);

	return result;
}
