/* base class for point-wise creators
 *
 * 13/6/13
 */

/*

	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

 */

/*
#define VIPS_DEBUG
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

#include <vips/vips.h>

#include "pcreate.h"
#include "point.h"

G_DEFINE_ABSTRACT_TYPE(VipsPoint, vips_point, VIPS_TYPE_CREATE);

static int
vips_point_gen(VipsRegion *out_region,
	void *seq, void *a, void *b, gboolean *stop)
{
	VipsPoint *point = (VipsPoint *) a;
	VipsPointClass *class = VIPS_POINT_GET_CLASS(point);
	VipsRect *r = &out_region->valid;

	int x, y;

	for (y = 0; y < r->height; y++) {
		int ay = r->top + y;
		float *q = (float *) VIPS_REGION_ADDR(out_region, r->left, ay);

		for (x = 0; x < r->width; x++)
			q[x] = class->point(point, r->left + x, ay);
	}

	return 0;
}

static int
vips_point_build(VipsObject *object)
{
	VipsCreate *create = VIPS_CREATE(object);
	VipsPoint *point = VIPS_POINT(object);
	VipsPointClass *class = VIPS_POINT_GET_CLASS(point);
	VipsImage **t = (VipsImage **) vips_object_local_array(object, 4);

	VipsImage *in;

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

	t[0] = vips_image_new();
	vips_image_init_fields(t[0],
		point->width, point->height, 1,
		VIPS_FORMAT_FLOAT, VIPS_CODING_NONE, class->interpretation,
		1.0, 1.0);
	if (vips_image_pipelinev(t[0], VIPS_DEMAND_STYLE_ANY, NULL) ||
		vips_image_generate(t[0],
			NULL, vips_point_gen, NULL, point, NULL))
		return -1;
	in = t[0];

	if (point->uchar) {
		float min = class->min;
		float max = class->max;
		float range = max - min;

		if (vips_linear1(in, &t[2],
				255.0 / range, -min * 255.0 / range,
				"uchar", TRUE,
				NULL))
			return -1;
		in = t[2];

		/* We don't want FOURIER or whatever in this case.
		 */
		in->Type = VIPS_INTERPRETATION_MULTIBAND;
	}

	if (vips_image_write(in, create->out))
		return -1;

	return 0;
}

static void
vips_point_class_init(VipsPointClass *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 = "point";
	vobject_class->description = _("make a point image");
	vobject_class->build = vips_point_build;

	class->point = NULL;
	class->min = -1.0;
	class->max = 1.0;
	class->interpretation = VIPS_INTERPRETATION_MULTIBAND;

	VIPS_ARG_INT(class, "width", 2,
		_("Width"),
		_("Image width in pixels"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsPoint, width),
		1, VIPS_MAX_COORD, 1);

	VIPS_ARG_INT(class, "height", 3,
		_("Height"),
		_("Image height in pixels"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsPoint, height),
		1, VIPS_MAX_COORD, 1);

	VIPS_ARG_BOOL(class, "uchar", 4,
		_("Uchar"),
		_("Output an unsigned char image"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsPoint, uchar),
		FALSE);
}

static void
vips_point_init(VipsPoint *point)
{
}
