/* simple wrapper over vips_affine() to make scale / rotate easy from the
 * command-line
 *
 * 3/10/13
 * 	- from affine.c
 * 25/10/13
 * 	- oops, reverse rotation direction to match the convention used in the
 * 	  rest of vips
 * 13/8/14
 * 	- oops, missing scale from b, thanks Topochicho
 * 7/2/16
 * 	- use vips_reduce(), if we can
 * 17/11/17
 * `	- add optional "background" param
 * `	- don't use vips_reduce() since it has no "background" param
 * 10/3/18
 * 	- add vips_rotate() class for convenience
 */

/*

	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 DEBUG
 */

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

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

#include <vips/vips.h>

#include "presample.h"

typedef struct _VipsSimilarityBase {
	VipsResample parent_instance;

	double scale;
	double angle;
	VipsInterpolate *interpolate;
	VipsArrayDouble *background;
	double odx;
	double ody;
	double idx;
	double idy;

} VipsSimilarityBase;

typedef VipsResampleClass VipsSimilarityBaseClass;

G_DEFINE_ABSTRACT_TYPE(VipsSimilarityBase, vips_similarity_base,
	VIPS_TYPE_RESAMPLE);

static int
vips_similarity_base_build(VipsObject *object)
{
	VipsResample *resample = VIPS_RESAMPLE(object);
	VipsSimilarityBase *base = (VipsSimilarityBase *) object;
	VipsImage **t = (VipsImage **)
		vips_object_local_array(object, 4);
	double a = base->scale * cos(VIPS_RAD(base->angle));
	double b = base->scale * -sin(VIPS_RAD(base->angle));
	double c = -b;
	double d = a;

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

	if (vips_affine(resample->in, &t[0], a, b, c, d,
			"interpolate", base->interpolate,
			"odx", base->odx,
			"ody", base->ody,
			"idx", base->idx,
			"idy", base->idy,
			"background", base->background,
			NULL))
		return -1;

	if (vips_image_write(t[0], resample->out))
		return -1;

	return 0;
}

static void
vips_similarity_base_class_init(VipsSimilarityBaseClass *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 = "similarity_base";
	vobject_class->description = _("base similarity transform");
	vobject_class->build = vips_similarity_base_build;

	VIPS_ARG_INTERPOLATE(class, "interpolate", 5,
		_("Interpolate"),
		_("Interpolate pixels with this"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarityBase, interpolate));

	VIPS_ARG_BOXED(class, "background", 6,
		_("Background"),
		_("Background value"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarityBase, background),
		VIPS_TYPE_ARRAY_DOUBLE);

	VIPS_ARG_DOUBLE(class, "odx", 112,
		_("Output offset"),
		_("Horizontal output displacement"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarityBase, odx),
		-10000000, 10000000, 0);

	VIPS_ARG_DOUBLE(class, "ody", 113,
		_("Output offset"),
		_("Vertical output displacement"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarityBase, ody),
		-10000000, 10000000, 0);

	VIPS_ARG_DOUBLE(class, "idx", 114,
		_("Input offset"),
		_("Horizontal input displacement"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarityBase, idx),
		-10000000, 10000000, 0);

	VIPS_ARG_DOUBLE(class, "idy", 115,
		_("Input offset"),
		_("Vertical input displacement"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarityBase, idy),
		-10000000, 10000000, 0);
}

static void
vips_similarity_base_init(VipsSimilarityBase *base)
{
	base->scale = 1;
	base->angle = 0;
	base->interpolate = NULL;
	base->odx = 0;
	base->ody = 0;
	base->idx = 0;
	base->idy = 0;
	base->background = vips_array_double_newv(1, 0.0);
}

typedef VipsSimilarityBase VipsSimilarity;
typedef VipsSimilarityBaseClass VipsSimilarityClass;

G_DEFINE_TYPE(VipsSimilarity, vips_similarity,
	vips_similarity_base_get_type());

static void
vips_similarity_class_init(VipsSimilarityClass *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 = "similarity";
	vobject_class->description = _("similarity transform of an image");

	VIPS_ARG_DOUBLE(class, "scale", 3,
		_("Scale"),
		_("Scale by this factor"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarity, scale),
		0, 10000000, 1);

	VIPS_ARG_DOUBLE(class, "angle", 4,
		_("Angle"),
		_("Rotate anticlockwise by this many degrees"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsSimilarity, angle),
		-10000000, 10000000, 0);
}

static void
vips_similarity_init(VipsSimilarity *similarity)
{
}

/**
 * vips_similarity: (method)
 * @in: input image
 * @out: (out): output image
 * @...: %NULL-terminated list of optional named arguments
 *
 * Optional arguments:
 *
 * * @scale: %gdouble, scale by this factor
 * * @angle: %gdouble, rotate by this many degrees clockwise
 * * @interpolate: #VipsInterpolate, interpolate pixels with this
 * * @background: #VipsArrayDouble colour for new pixels
 * * @idx: %gdouble, input horizontal offset
 * * @idy: %gdouble, input vertical offset
 * * @odx: %gdouble, output horizontal offset
 * * @ody: %gdouble, output vertical offset
 *
 * This operator calls vips_affine() for you, calculating the matrix for the
 * affine transform from @scale and @angle. Other parameters are passed on to
 * vips_affine() unaltered.
 *
 * See also: vips_affine(), #VipsInterpolate.
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_similarity(VipsImage *in, VipsImage **out, ...)
{
	va_list ap;
	int result;

	va_start(ap, out);
	result = vips_call_split("similarity", ap, in, out);
	va_end(ap);

	return result;
}

typedef VipsSimilarityBase VipsRotate;
typedef VipsSimilarityBaseClass VipsRotateClass;

G_DEFINE_TYPE(VipsRotate, vips_rotate, vips_similarity_base_get_type());

static void
vips_rotate_class_init(VipsRotateClass *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 = "rotate";
	vobject_class->description =
		_("rotate an image by a number of degrees");

	VIPS_ARG_DOUBLE(class, "angle", 4,
		_("Angle"),
		_("Rotate anticlockwise by this many degrees"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsSimilarity, angle),
		-10000000, 10000000, 0);
}

static void
vips_rotate_init(VipsRotate *rotate)
{
}

/**
 * vips_rotate: (method)
 * @in: input image
 * @out: (out): output image
 * @angle: %gdouble, rotate by this many degrees clockwise
 * @...: %NULL-terminated list of optional named arguments
 *
 * Optional arguments:
 *
 * * @interpolate: #VipsInterpolate, interpolate pixels with this
 * * @background: #VipsArrayDouble colour for new pixels
 * * @idx: %gdouble, input horizontal offset
 * * @idy: %gdouble, input vertical offset
 * * @odx: %gdouble, output horizontal offset
 * * @ody: %gdouble, output vertical offset
 *
 * This operator calls vips_affine() for you, calculating the matrix for the
 * affine transform from @scale and @angle. Other parameters are passed on to
 * vips_affine() unaltered.
 *
 * See also: vips_affine(), #VipsInterpolate.
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_rotate(VipsImage *in, VipsImage **out, double angle, ...)
{
	va_list ap;
	int result;

	va_start(ap, angle);
	result = vips_call_split("rotate", ap, in, out, angle);
	va_end(ap);

	return result;
}
