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/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 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
 * 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: /cvsroot/scummvm/scummvm/backends/sdl/sdl-common.h,v 1.69 2004/12/11 15:17:47 arisme Exp $

#ifndef SDL_COMMON_H
#define SDL_COMMON_H

#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/scaler.h"
#include "common/system.h"
#include "backends/intern.h"

#include <SDL.h>

#ifndef _WIN32_WCE
// Uncomment this to enable the 'on screen display' code.
#define USE_OSD   1

static const int s_gfxModeSwitchTable[][4] = {
            { GFX_NORMAL, GFX_HQ2X, GFX_HQ3X, -1 },
            { GFX_NORMAL, GFX_2XSAI, -1, -1 },
            { GFX_NORMAL, GFX_SUPER2XSAI, -1, -1 },
            { GFX_NORMAL, GFX_SUPEREAGLE, -1, -1 },
            { GFX_NORMAL, GFX_TV2X, -1, -1 },
            { GFX_NORMAL, GFX_DOTMATRIX, -1, -1 }

class OSystem_SDL : public OSystem {
      virtual ~OSystem_SDL();

      void beginGFXTransaction(void);
      void endGFXTransaction(void);

      // Set the size of the video bitmap.
      // Typically, 320x200
      virtual void initSize(uint w, uint h); // overloaded by CE backend

      // Set colors of the palette
      void setPalette(const byte *colors, uint start, uint num);

      // Draw a bitmap to screen.
      // The screen will not be updated to reflect the new bitmap
      void copyRectToScreen(const byte *src, int pitch, int x, int y, int w, int h);

      // Clear the screen
      void clearScreen();

      // Update the dirty areas of the screen
      void updateScreen();

      // Either show or hide the mouse cursor
      bool showMouse(bool visible);
      // Warp the mouse cursor. Where set_mouse_pos() only informs the
      // backend of the mouse cursor's current position, this function
      // actually moves the cursor to the specified position.
      virtual void warpMouse(int x, int y); // overloaded by CE backend

      // Set the bitmap that's used when drawing the cursor.
      void setMouseCursor(const byte *buf, uint w, uint h, int hotspot_x, int hotspot_y, byte keycolor);

      // Shaking is used in SCUMM. Set current shake position.
      void setShakePos(int shake_pos);

      // Get the number of milliseconds since the program was started.
      uint32 getMillis();

      // Delay for a specified amount of milliseconds
      void delayMillis(uint msecs);

      // Get the next event.
      // Returns true if an event was retrieved.      
      virtual bool pollEvent(Event &event); // overloaded by CE backend

      // Set function that generates samples 
      virtual bool setSoundCallback(SoundProc proc, void *param); // overloaded by CE backend
      void clearSoundCallback();

      // Poll CD status
      // Returns true if cd audio is playing
      bool pollCD();

      // Play CD audio track
      void playCD(int track, int num_loops, int start_frame, int duration);

      // Stop CD audio track
      void stopCD();

      // Update CD audio status
      void updateCD();

      // Quit
      virtual void quit(); // overloaded by CE backend

      // Add a callback timer
      void setTimerCallback(TimerProc callback, int timer);

      // Mutex handling
      MutexRef createMutex();
      void lockMutex(MutexRef mutex);
      void unlockMutex(MutexRef mutex);
      void deleteMutex(MutexRef mutex);

      // Overlay
      virtual void showOverlay();
      virtual void hideOverlay();
      virtual void clearOverlay();
      virtual void grabOverlay(OverlayColor *buf, int pitch);
      virtual void copyRectToOverlay(const OverlayColor *buf, int pitch, int x, int y, int w, int h);
      virtual int16 getHeight();
      virtual int16 getWidth();

      // Methods that convert RGB to/from colors suitable for the overlay.
      virtual OverlayColor RGBToColor(uint8 r, uint8 g, uint8 b);
      virtual void colorToRGB(OverlayColor color, uint8 &r, uint8 &g, uint8 &b);

      virtual const GraphicsMode *getSupportedGraphicsModes() const;
      virtual int getDefaultGraphicsMode() const;
      virtual bool setGraphicsMode(int mode);
      virtual int getGraphicsMode() const;
      virtual void setWindowCaption(const char *caption);
      virtual bool openCD(int drive);
      virtual int getOutputSampleRate() const;

      virtual bool hasFeature(Feature f);
      virtual void setFeatureState(Feature f, bool enable);
      virtual bool getFeatureState(Feature f);

#ifdef USE_OSD
      void displayMessageOnOSD(const char *msg);

      void initIntern();

#ifdef USE_OSD
      SDL_Surface *_osdSurface;
      Uint8 _osdAlpha;              // Transparency level of the OSD
      uint32 _osdFadeStartTime;     // When to start the fade out
      enum {
            kOSDFadeOutDelay = 2 * 1000,  // Delay before the OSD is faded out (in milliseconds)
            kOSDFadeOutDuration = 500,          // Duration of the OSD fade out (in milliseconds)
            kOSDColorKey = 1,
            kOSDInitialAlpha = 80               // Initial alpha level, in percent

      // hardware screen
      SDL_Surface *_hwscreen;

      // unseen game screen
      SDL_Surface *_screen;
      int _screenWidth, _screenHeight;

      // temporary screen (for scalers/overlay)
      SDL_Surface *_tmpscreen;
      bool _overlayVisible;

      // Audio
      int _samplesPerSec;

      // CD Audio
      SDL_CD *_cdrom;
      int _cdTrack, _cdNumLoops, _cdStartFrame, _cdDuration;
      uint32 _cdEndTime, _cdStopTime;

      enum {
            DF_WANT_RECT_OPTIM                  = 1 << 0,
            DF_UPDATE_EXPAND_1_PIXEL      = 1 << 1

      enum {
            kTransactionNone = 0,
            kTransactionCommit = 1,
            kTransactionActive = 2

      struct transactionDetails {
            int mode;
            bool modeChanged;
            int w;
            bool wChanged;
            int h;
            bool hChanged;
            bool fs;
            bool fsChanged;
            bool ar;
            bool arChanged;
      } _transactionDetails;

      /** Force full redraw on next updateScreen */
      bool _forceFull;
      ScalerProc *_scalerProc;
      int _scalerType;  
      int _scaleFactor;
      int _mode;
      int _transactionMode;
      bool _fullscreen;
      /** Current video mode flags (see DF_* constants) */
      uint32 _modeFlags;
      bool _modeChanged;

      /** True if aspect ratio correction is enabled. */
      bool _adjustAspectRatio;

      enum {
            NUM_DIRTY_RECT = 100,

            MAX_MOUSE_W = 80,
            MAX_MOUSE_H = 80,
            MAX_SCALING = 3

      // Dirty rect management
      SDL_Rect _dirtyRectList[NUM_DIRTY_RECT];
      int _numDirtyRects;
      uint32 *_dirtyChecksums;
      bool _cksumValid;
      int _cksumNum;

      // Keyboard mouse emulation
      struct KbdMouse { 
            int16 x, y, x_vel, y_vel, x_max, y_max, x_down_count, y_down_count;
            uint32 last_time, delay_time, x_down_time, y_down_time;

      struct MousePos {
            int16 x, y, w, h;

      // mouse
      KbdMouse _km;
      bool _mouseVisible;
      bool _mouseDrawn;
      byte *_mouseData;
      byte *_mouseBackup;
      MousePos _mouseCurState;
      int16 _mouseHotspotX;
      int16 _mouseHotspotY;
      byte _mouseKeyColor;

      // joystick
      SDL_Joystick *_joystick;

      // Shake mode
      int _currentShakePos;
      int _newShakePos;

      // Palette data
      SDL_Color *_currentPalette;
      uint _paletteDirtyStart, _paletteDirtyEnd;
       * Mutex which prevents multiple threads from interfering with each other
       * when accessing the screen.
      MutexRef _graphicsMutex;

      void addDirtyRgnAuto(const byte *buf);
      void makeChecksums(const byte *buf);
      virtual void addDirtyRect(int x, int y, int w, int h); // overloaded by CE backend

      virtual void drawMouse(); // overloaded by CE backend
      virtual void undrawMouse(); // overloaded by CE backend
      /** Set the position of the virtual mouse cursor. */
      void setMousePos(int x, int y);
      virtual void fillMouseEvent(Event &event, int x, int y); // overloaded by CE backend
      void toggleMouseGrab();

      virtual void internUpdateScreen(); // overloaded by CE backend

      virtual void loadGFXMode(); // overloaded by CE backend
      virtual void unloadGFXMode(); // overloaded by CE backend
      virtual void hotswapGFXMode(); // overloaded by CE backend
      void setFullscreenMode(bool enable);
      void setAspectRatioCorrection(bool enable);

      virtual bool saveScreenshot(const char *filename); // overloaded by CE backend
      int effectiveScreenHeight() const { return (_adjustAspectRatio ? 240 : _screenHeight) * _scaleFactor; }

      void setupIcon();
      void handleKbdMouse();


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