/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

#ifndef SKYSCREEN_H
#define SKYSCREEN_H

#include "stdafx.h"
#include <string.h>
#include "common/engine.h"
#include "common/scummsys.h"
#include "sky/disk.h"
#include "sky/skydefs.h"
#include "sky/sky.h"

#define SCROLL_JUMP		16
#define VGA_COLOURS		256
#define GAME_COLOURS		240
#define SEQ_DELAY 3

class SkyScreen {
public:
	SkyScreen(OSystem *pSystem, SkyDisk *pDisk);
	~SkyScreen(void);
	void setPalette(uint8 *pal);
	void setPalette(uint16 fileNum);

	void fnFadeDown(uint8 action);
	void paletteFadeUp(uint8 *pal);
	void paletteFadeUp(uint16 fileNr);

	void showScreen(uint16 fileNum);
	void showScreen(uint8 *pScreen);
	
	void handleTimer(void);
	void startSequence(uint16 fileNum);
	void stopSequence(void);
	bool sequenceRunning(void);
	uint32 seqFramesLeft(void) { return _seqInfo.framesLeft; };
	uint8 *giveCurrent(void) { return _currentScreen; };
private:
	OSystem *_system;
	SkyDisk *_skyDisk;
	static uint8 _top16Colours[16*3];
	uint8 _palette[1024];

	bool volatile _gotTick;

	void waitForTimer(void);

	struct {
		uint32 framesLeft;
		uint32 delay;
		uint8 *seqData;
		uint8 *seqDataPos;
		bool running;
	} _seqInfo;
	void processSequence(void);

	uint8 *_currentScreen;

	//byte *_workScreen;
	//byte *_backScreen;
	//byte *_tempPal;
	//byte *_workPalette;
	//byte *_halfPalette;
	//byte *_scrollAddr;
	//byte *_lScreenBuf, *_lPaletteBuf;
	byte *_gameGrid;

	void convertPalette(uint8 *inPal, uint8* outPal);
	void palette_fadedown_helper(uint32 *pal, uint num);
};

#endif //SKYSCREEN_H