/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef KYRA_SCREEN_H
#define KYRA_SCREEN_H

#include "common/util.h"

class OSystem;

namespace Kyra {

class KyraEngine;
class Debugger;
struct Rect;

struct ScreenDim {
	uint16 sx;
	uint16 sy;
	uint16 w;
	uint16 h;
	uint16 unk8;
	uint16 unkA;
	uint16 unkC;
	uint16 unkE;
};

struct Font {
	uint8 *fontData;
	uint8 *charWidthTable;
	uint16 charSizeOffset;
	uint16 charBitmapOffset;
	uint16 charWidthTableOffset;
	uint16 charHeightTableOffset;
};

class Screen {
	friend class Debugger;
public:

	enum {
		SCREEN_W = 320,
		SCREEN_H = 200,
		SCREEN_PAGE_SIZE = 320 * 200 + 1024,
		SCREEN_OVL_SJIS_SIZE = 640 * 400,
		SCREEN_PAGE_NUM = 16,
		SCREEN_OVLS_NUM = 3
	};

	enum CopyRegionFlags {
		CR_X_FLIPPED  = 0x01,
		CR_CLIPPED    = 0x02,
		CR_NO_P_CHECK = 0x04
	};

	enum DrawShapeFlags {
		DSF_X_FLIPPED  = 0x01,
		DSF_Y_FLIPPED  = 0x02,
		DSF_SCALE      = 0x04,
		DSF_WND_COORDS = 0x10,
		DSF_CENTER     = 0x20
	};
	
	enum FontId {
		FID_6_FNT = 0,
		FID_8_FNT,
		FID_CRED6_FNT,
		FID_CRED8_FNT,
		FID_BOOKFONT_FNT,
		FID_GOLDFONT_FNT,
		FID_NUM
	};
	
	Screen(KyraEngine *vm, OSystem *system);
	~Screen();

	bool init();

	void updateScreen();

	// page cur. functions
	int setCurPage(int pageNum);

	void copyFromCurPageBlock(int x, int y, int w, int h, const uint8 *src);
	void copyCurPageBlock(int x, int y, int w, int h, uint8 *dst);

	void clearCurPage();

	// page 0 functions
	void copyToPage0(int y, int h, uint8 page, uint8 *seqBuf);
	void shakeScreen(int times);

	// page functions
	void copyRegion(int x1, int y1, int x2, int y2, int w, int h, int srcPage, int dstPage, int flags=0);
	void copyPage(uint8 srcPage, uint8 dstPage);

	void copyRegionToBuffer(int pageNum, int x, int y, int w, int h, uint8 *dest);
	void copyBlockToPage(int pageNum, int x, int y, int w, int h, const uint8 *src);

	void shuffleScreen(int sx, int sy, int w, int h, int srcPage, int dstPage, int ticks, bool transparent);
	void fillRect(int x1, int y1, int x2, int y2, uint8 color, int pageNum = -1);

	void clearPage(int pageNum);

	uint8 getPagePixel(int pageNum, int x, int y);
	void setPagePixel(int pageNum, int x, int y, uint8 color);

	const uint8 *getCPagePtr(int pageNum) const;
	uint8 *getPageRect(int pageNum, int x, int y, int w, int h);

	// palette handling
	void fadeFromBlack(int delay=0x54);
	void fadeToBlack(int delay=0x54);

	void fadeSpecialPalette(int palIndex, int startIndex, int size, int fadeTime);
	void fadePalette(const uint8 *palData, int delay);

	void setPaletteIndex(uint8 index, uint8 red, uint8 green, uint8 blue);
	void setScreenPalette(const uint8 *palData);
	uint8 *getPalette(int num);

	// gui specific (processing on _curPage)
	void drawLine(bool vertical, int x, int y, int length, int color);
	void drawClippedLine(int x1, int y1, int x2, int y2, int color);
	void drawShadedBox(int x1, int y1, int x2, int y2, int color1, int color2);
	void drawBox(int x1, int y1, int x2, int y2, int color);

	// font/text handling
	bool loadFont(FontId fontId, const char *filename);
	FontId setFont(FontId fontId);

	int getFontHeight() const;
	int getFontWidth() const;

	int getCharWidth(uint16 c) const;
	int getTextWidth(const char *str) const;

	void printText(const char *str, int x, int y, uint8 color1, uint8 color2);

	void setTextColorMap(const uint8 *cmap);
	void setTextColor(const uint8 *cmap, int a, int b);

	void setScreenDim(int dim);

	// shape handling
	uint8 *encodeShape(int x, int y, int w, int h, int flags);

	int setNewShapeHeight(uint8 *shape, int height);
	int resetShapeHeight(uint8 *shape);

	void drawShape(uint8 pageNum, const uint8 *shapeData, int x, int y, int sd, int flags, ...);

	// mouse handling
	void hideMouse();
	void showMouse();
	void setMouseCursor(int x, int y, byte *shape);	

	// rect handling
	int getRectSize(int w, int h);

	void rectClip(int &x, int &y, int w, int h);

	void addBitBlitRect(int x, int y, int w, int h);
	void bitBlitRects();

	// misc	
	void loadBitmap(const char *filename, int tempPage, int dstPage, uint8 *palData);

	void loadPalette(const char *filename, uint8 *palData);
	void loadPalette(const byte *data, uint8 *palData, int bytes);

	void setAnimBlockPtr(int size);

	void setShapePages(int page1, int page2);
	
	byte getShapeFlag1(int x, int y);
	byte getShapeFlag2(int x, int y);
	
	void savePageToDisk(const char *file, int page);
	void loadPageFromDisk(const char *file, int page);
	void deletePageFromDisk(int page);

	void blockInRegion(int x, int y, int width, int height);
	void blockOutRegion(int x, int y, int width, int height);

	void backUpRect0(int xpos, int ypos);
	void restoreRect0(int xpos, int ypos);
	void backUpRect1(int xpos, int ypos);
	void restoreRect1(int xpos, int ypos);
	void copyBackgroundBlock(int x, int page, int flag);
	void copyBackgroundBlock2(int x);

	int getDrawLayer(int x, int y);
	int getDrawLayer2(int x, int y, int height);

	int _charWidth;
	int _charOffset;
	int _curPage;
	uint8 *_currentPalette;
	uint8 *_shapePages[2];
	FontId _currentFont;
	bool _disableScreen;

	const ScreenDim *_curDim;
	
	static const ScreenDim _screenDimTable[];
	static const int _screenDimTableCount;

	// decoding functions
	static void decodeFrame3(const uint8 *src, uint8 *dst, uint32 size);
	static uint decodeFrame4(const uint8 *src, uint8 *dst, uint32 dstSize);
	static void decodeFrameDelta(uint8 *dst, const uint8 *src, bool noXor = false);
	static void decodeFrameDeltaPage(uint8 *dst, const uint8 *src, const int pitch, bool noXor);
	static void convertAmigaGfx(uint8 *data, int w, int h, bool offscreen = true);
	static void convertAmigaMsc(uint8 *data);

	// maybe subclass screen for kyra3
	static const ScreenDim _screenDimTableK3[];
	static const int _screenDimTableCountK3;

	uint8 *getPtrToShape(uint8 *shpFile, int shape);
	const uint8 *getPtrToShape(const uint8 *shpFile, int shape);

	uint16 getShapeSize(const uint8 *shp);

private:
	uint8 *getPagePtr(int pageNum);
	void updateDirtyRects();
	void updateDirtyRectsOvl();

	void scale2x(byte *dst, int dstPitch, const byte *src, int srcPitch, int w, int h);
	void mergeOverlay(int x, int y, int w, int h);

	// overlay specific
	byte *getOverlayPtr(int pageNum);
	void clearOverlayPage(int pageNum);
	void clearOverlayRect(int pageNum, int x, int y, int w, int h);
	void copyOverlayRegion(int x, int y, int x2, int y2, int w, int h, int srcPage, int dstPage);

	// font/text specific
	void drawCharANSI(uint8 c, int x, int y);
	void drawCharSJIS(uint16 c, int x, int y);

	enum {
		SJIS_CHARSIZE = 18,
		SJIS_CHARS = 8192
	};

	int16 encodeShapeAndCalculateSize(uint8 *from, uint8 *to, int size);
	void restoreMouseRect();
	void copyMouseToScreen();
	void copyScreenFromRect(int x, int y, int w, int h, const uint8 *ptr);
	void copyScreenToRect(int x, int y, int w, int h, uint8 *ptr);

	template<bool noXor> static void wrapped_decodeFrameDelta(uint8 *dst, const uint8 *src);
	template<bool noXor> static void wrapped_decodeFrameDeltaPage(uint8 *dst, const uint8 *src, const int pitch);

	uint8 *_pagePtrs[16];
	uint8 *_sjisOverlayPtrs[SCREEN_OVLS_NUM];

	bool _useOverlays;
	bool _useSJIS;

	uint8 *_sjisFontData;
	uint8 *_sjisTempPage;
	uint8 *_sjisTempPage2;
	uint8 *_sjisSourceChar;

	uint8 *_saveLoadPage[8];

	uint8 *_screenPalette;
	uint8 *_palettes[3];

	Font _fonts[FID_NUM];
	uint8 _textColorsMap[16];

	uint8 *_decodeShapeBuffer;
	int _decodeShapeBufferSize;

	uint8 *_animBlockPtr;
	int _animBlockSize;

	int _mouseLockCount;
	
	Rect *_bitBlitRects;
	int _bitBlitNum;
	uint8 *_unkPtr1, *_unkPtr2;
	
	enum {
		kMaxDirtyRects = 50
	};
	
	bool _forceFullUpdate;
	int _numDirtyRects;
	Rect *_dirtyRects;
	
	void addDirtyRect(int x, int y, int w, int h);

	OSystem *_system;
	KyraEngine *_vm;
};

} // End of namespace Kyra

#endif