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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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.
+
+ * 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 General Public License for more details.
+
+ * You should have received a copy of the GNU 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.
+ *
+ */
+
+/*
+ * This code is based on the original source code of Lord Avalot d'Argent version 1.3.
+ * Copyright (c) 1994-1995 Mike, Mark and Thomas Thurman.
+ */
+
+/* CELER	The unit for updating the screen pics. */
+
+#ifndef AVALANCHE_CELER2_H
+#define AVALANCHE_CELER2_H
+
+#include "common/scummsys.h"
+#include "common/file.h"
+#include "common/str.h"
+
+#include "graphics/surface.h"
+
+namespace Avalanche {
+class AvalancheEngine;
+
+class Celer {
+public:
+	Celer(AvalancheEngine *vm);
+	~Celer();
+
+	void updateBackgroundSprites();
+	void loadBackgroundSprites(byte number);
+	void forgetBackgroundSprites();
+
+	// Setting the destination to negative coordinates means the picture should be drawn to it's original position.
+	// If you give it positive values, the picture will be plotted to the desired coordinates on the screen.
+	// By that we get rid of show_one_at(), which would be almost identical and cause a lot of code duplication.
+	void drawBackgroundSprite(int16 destX, int16 destY, byte which);
+
+private:
+	enum PictureType {kEga, kBgi, kNaturalImage};
+
+	struct SpriteType {
+		PictureType _type;
+		int16 _x, _y;
+		int16 _xl, _yl;
+		int32 _size;
+		::Graphics::Surface _picture;
+	};
+
+	AvalancheEngine *_vm;
+
+	int32 _offsets[40];
+	byte _spriteNum;
+	SpriteType _sprites[40];
+	ByteField _r;
+	Common::String _filename;
+	static const int16 kOnDisk; // Value of memos[fv].x when it's not in memory.
+
+	void drawSprite(int16 x, int16 y, SpriteType &sprite);
+};
+
+} // End of namespace Avalanche.
+
+#endif // AVALANCHE_CELER2_H