/*************************************************************************/
/*  editor_atlas_packer.h                                                */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#ifndef EDITOR_ATLAS_PACKER_H
#define EDITOR_ATLAS_PACKER_H

#include "core/math/vector2.h"

#include "core/templates/vector.h"
#include "scene/resources/bit_map.h"

class EditorAtlasPacker {
public:
	struct Chart {
		Vector<Vector2> vertices;
		struct Face {
			int vertex[3] = { 0 };
		};
		Vector<Face> faces;
		bool can_transpose = false;

		Vector2 final_offset;
		bool transposed = false;
	};

private:
	struct PlottedBitmap {
		int chart_index = 0;
		Vector2i offset;
		int area = 0;
		Vector<int> top_heights;
		Vector<int> bottom_heights;
		bool transposed = false;

		Vector2 final_pos;

		bool operator<(const PlottedBitmap &p_bm) const {
			return area > p_bm.area;
		}
	};

	static void _plot_triangle(Ref<BitMap> p_bitmap, Vector2i *vertices);

public:
	static void chart_pack(Vector<Chart> &charts, int &r_width, int &r_height, int p_atlas_max_size = 2048, int p_cell_resolution = 4);
};

#endif // EDITOR_ATLAS_PACKER_H