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/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001/2002 The ScummVM project
 * Copyright (C) 2002 ph0x (GP32 port)
 * 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. 

#include "backends/intern.h"
#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/system.h"
#include "common/scummsys.h"
#include "common/stdafx.h"
#include "base/engine.h"
#include "scumm/saveload.h"
#include "common/scaler.h"

#include "portdefs.h"
#include "sdl.h"

class OSystem_GP32 : public OSystem {
      // Set colors of the palette
      void setPalette(const byte *colors, uint start, uint num);

      // Set the size of the video bitmap.
      // Typically, 320x200
      void initSize(uint w, uint h);
      int16 getHeight() { return _screenHeight; }
      int16 getWidth() { return _screenWidth; }
      // Draw a bitmap to screen.
      // The screen will not be updated to reflect the new bitmap
      void copyRectToScreen(const byte *buf, int pitch, int x, int y, int w, int h);

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

      // Either show or hide the mouse cursor
      bool showMouse(bool visible);
      void warpMouse(int x, int y);
      // Set the position of the mouse cursor
      void set_mouse_pos(int x, int y);
      // 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.      
      bool pollEvent(Event &event);

      // Set the function to be invoked whenever samples need to be generated
      // Format is the sample type format.
      // Only 16-bit signed mode is needed for simon & scumm
      bool setSoundCallback(SoundProc proc, void *param);
      void clearSoundCallback();
      // Get or set a property
      uint32 property(int param, Property *value);
      // Poll cdrom status
      // Returns true if cd audio is playing
      bool pollCD();

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

      // Stop cdrom audio track
      void stopCD();

      // Update cdrom audio status
      void updateCD();

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

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

      // Quit
      void quit();
      // Overlay
      void showOverlay();
      void hideOverlay();
      void clearOverlay();
      void grabOverlay(int16 *buf, int pitch);
      void copyRectToOverlay(const int16 *buf, int pitch, int x, int y, int w, int h);

      static OSystem *create(int gfx_mode, bool full_screen);

      SDL_Surface *sdl_tmpscreen;   // temporary screen (for scalers/overlay)
      SDL_Surface *sdl_hwscreen;    // hardware screen
      bool _overlay_visible;

      ScalerProc *_scaler_proc;


      //uint msec_start;
      //uint32 get_ticks();

      ///OSystem_GP32(); // eh?
      /// ~OSystem_GP32();

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

      // CD Audio
      ///SDL_CD *_cdrom;
      int cd_track, cd_num_loops, cd_start_frame, cd_end_frame;
      uint32 cd_end_time, cd_stop_time, cd_next_second;

      enum {
            DF_WANT_RECT_OPTIM                  = 1 << 0,
            DF_UPDATE_EXPAND_1_PIXEL      = 1 << 3

      bool _forceFull; // Force full redraw on next updateScreen
      int _scaleFactor;
      int _mode;
      bool _full_screen;
      uint32 _mode_flags;

      enum {
            NUM_DIRTY_RECT = 100,

            MAX_MOUSE_W = 40,
            MAX_MOUSE_H = 40,
            MAX_SCALING = 3

      // Dirty rect managment
      SDL_Rect _dirty_rect_list[100];
      int _num_dirty_rects;
      uint32 *_dirty_checksums;
      bool cksum_valid;
      int CKSUM_NUM;

      // 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;
      } km;

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

      bool _mouseVisible;
      bool _mouseDrawn;
      byte *_mouseData;
      byte *_mouseBackup;
      MousePos _mouse_cur_state;
      MousePos _mouse_old_state;
      int16 _mouseHotspotX;
      int16 _mouseHotspotY;
      byte _mouseKeycolor;

      // Shake mode
      int _currentShakePos;
      int _newShakePos;

      // Palette data
      SDL_Color *_currentPalette;
      uint _paletteDirtyStart, _paletteDirtyEnd;

      void add_dirty_rgn_auto(const byte *buf);
      void mk_checksums(const byte *buf);

      static void fill_sound(void *userdata, Uint8 * stream, int len);
      void add_dirty_rect(int x, int y, int w, int h);

      void draw_mouse();
      void undraw_mouse();

      void load_gfx_mode();
      void unload_gfx_mode();
      void hotswap_gfx_mode();

      void get_screen_image(byte *buf);   

      void setup_icon();
      void kbd_mouse();

      static OSystem_GP32 *create();

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