/*
** tileatlas.h
**
** This file is part of mkxp.
**
** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
**
** mkxp is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 2 of the License, or
** (at your option) any later version.
**
** mkxp 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with mkxp.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef TILEATLAS_H
#define TILEATLAS_H

#include "etc-internal.h"

#include <vector>

namespace TileAtlas{

/* Abstract definition of a blit
 * operation with undefined rect width */
struct Blit{
	Vec2i src;
	Vec2i dst;
	int h;

	Blit(int sx, int sy,
	     int dx, int dy,
	     int h)
	    : src(sx, sy),
	      dst(dx, dy),
	      h(h)
	{}
};

typedef std::vector<Blit> BlitVec;

/* Calculates the minimum atlas size required to hold
 * a tileset of height 'tilesetH'. If the required dimensions
 * exceed 'maxAtlasSize', Vec2i(-1, -1) is returned. */
Vec2i minSize(int tilesetH, int maxAtlasSize);

/* Calculates a series of blits necessary to fill an atlas
 * of size 'atlasSize' with a tileset of height 'tilesetH'.
 * Usually fed results from 'minSize()'. */
BlitVec calcBlits(int tilesetH, const Vec2i &atlasSize);

/* Translates a tile coordinate (not pixel!) to a physical
 * pixel coordinate in the atlas */
Vec2i tileToAtlasCoor(int tileX, int tileY, int tilesetH, int atlasH);

}

#endif // TILEATLAS_H
