/* make an xy index image
 *
 * 21/4/04
 *	- from im_grey
 * 1/2/11
 * 	- gtk-doc
 * 31/10/11
 * 	- 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

 */

/*
#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 <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>

#include "pcreate.h"

typedef struct _VipsXyz {
	VipsCreate parent_instance;

	int width;
	int height;
	int csize;
	int dsize;
	int esize;

	int dimensions;

} VipsXyz;

typedef VipsCreateClass VipsXyzClass;

G_DEFINE_TYPE(VipsXyz, vips_xyz, VIPS_TYPE_CREATE);

static int
vips_xyz_gen(VipsRegion *out_region,
	void *seq, void *a, void *b, gboolean *stop)
{
	VipsXyz *xyz = (VipsXyz *) a;
	VipsRect *r = &out_region->valid;
	int le = r->left;
	int to = r->top;
	int ri = VIPS_RECT_RIGHT(r);
	int bo = VIPS_RECT_BOTTOM(r);

	int x, y, i;

	for (y = to; y < bo; y++) {
		unsigned int *q = (unsigned int *)
			VIPS_REGION_ADDR(out_region, le, y);

		unsigned int dims[5];
		int r;
		int h;

		h = xyz->height * xyz->csize * xyz->dsize;
		dims[4] = y / h;
		r = y % h;

		h /= xyz->dsize;
		dims[3] = r / h;
		r %= h;

		h /= xyz->csize;
		dims[2] = r / h;
		r %= h;

		dims[1] = r;

		for (x = le; x < ri; x++) {
			dims[0] = x;
			for (i = 0; i < xyz->dimensions; i++)
				q[i] = dims[i];

			q += xyz->dimensions;
		}
	}

	return 0;
}

static int
vips_xyz_build(VipsObject *object)
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS(object);
	VipsCreate *create = VIPS_CREATE(object);
	VipsXyz *xyz = (VipsXyz *) object;

	double d;
	int ysize;

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

	if ((vips_object_argument_isset(object, "dsize") &&
			!vips_object_argument_isset(object, "csize")) ||
		(vips_object_argument_isset(object, "esize") &&
			!vips_object_argument_isset(object, "dsize"))) {
		vips_error(class->nickname, "%s",
			_("lower dimensions not set"));
		return -1;
	}

	if (vips_object_argument_isset(object, "csize")) {
		xyz->dimensions += 1;

		if (vips_object_argument_isset(object, "dsize")) {
			xyz->dimensions += 1;

			if (vips_object_argument_isset(object, "esize"))
				xyz->dimensions += 1;
		}
	}

	d = (double) xyz->height * xyz->csize * xyz->dsize * xyz->esize;
	if (d > INT_MAX) {
		vips_error(class->nickname, "%s", _("image too large"));
		return -1;
	}
	ysize = d;

	vips_image_init_fields(create->out,
		xyz->width, ysize, xyz->dimensions,
		VIPS_FORMAT_UINT, VIPS_CODING_NONE,
		VIPS_INTERPRETATION_MULTIBAND,
		1.0, 1.0);
	if (vips_image_pipelinev(create->out, VIPS_DEMAND_STYLE_ANY, NULL) ||
		vips_image_generate(create->out,
			NULL, vips_xyz_gen, NULL, xyz, NULL))
		return -1;

	return 0;
}

static void
vips_xyz_class_init(VipsXyzClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS(class);

	VIPS_DEBUG_MSG("vips_xyz_class_init\n");

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	vobject_class->nickname = "xyz";
	vobject_class->description =
		_("make an image where pixel values are coordinates");
	vobject_class->build = vips_xyz_build;

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

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

	VIPS_ARG_INT(class, "csize", 6,
		_("csize"),
		_("Size of third dimension"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsXyz, csize),
		1, VIPS_MAX_COORD, 1);

	VIPS_ARG_INT(class, "dsize", 7,
		_("dsize"),
		_("Size of fourth dimension"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsXyz, dsize),
		1, VIPS_MAX_COORD, 1);

	VIPS_ARG_INT(class, "esize", 8,
		_("esize"),
		_("Size of fifth dimension"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsXyz, esize),
		1, VIPS_MAX_COORD, 1);
}

static void
vips_xyz_init(VipsXyz *xyz)
{
	xyz->width = 64;
	xyz->height = 64;
	xyz->dimensions = 2;
	xyz->csize = 1;
	xyz->dsize = 1;
	xyz->esize = 1;
}

/**
 * vips_xyz:
 * @out: (out): output image
 * @width: horizontal size
 * @height: vertical size
 * @...: %NULL-terminated list of optional named arguments
 *
 * Optional arguments:
 *
 * * @csize: size for third dimension
 * * @dsize: size for fourth dimension
 * * @esize: size for fifth dimension
 *
 * Create a two-band uint32 image where the elements in the first band have the
 * value of their x coordinate and elements in the second band have their y
 * coordinate.
 *
 * You can make any image where the value of a pixel is a function of its (x,
 * y) coordinate by combining this operator with the arithmetic operators.
 *
 * Set @csize, @dsize, @esize to generate higher dimensions and add more
 * bands. The extra dimensions are placed down the vertical axis. Use
 * vips_grid() to change the layout.
 *
 * See also: vips_grey(), vips_grid(), vips_identity().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_xyz(VipsImage **out, int width, int height, ...)
{
	va_list ap;
	int result;

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

	return result;
}
