/**************************************************************************/
/*  editor_atlas_packer.h                                                 */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
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/* 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     */
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/**************************************************************************/

#ifndef EDITOR_ATLAS_PACKER_H
#define EDITOR_ATLAS_PACKER_H

#include "core/math/vector2.h"

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

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

		Vector2 final_offset;
		bool transposed;
	};

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

		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
