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osys_iphone.cpp

/* 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.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/backends/platform/iphone/osys_iphone.cpp $
 * $Id: osys_iphone.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

#if defined(IPHONE_BACKEND)

#include <CoreGraphics/CGDirectDisplay.h>
#include <CoreSurface/CoreSurface.h>
#include <unistd.h>
#include <pthread.h>

#include "common/scummsys.h"
#include "common/util.h"
#include "common/rect.h"
#include "common/file.h"
#include "common/fs.h"

#include "base/main.h"

#include "backends/saves/default/default-saves.h"
#include "backends/timer/default/default-timer.h"
#include "backends/intern.h"
#include "sound/mixer.h"
#include "gui/message.h"

#include "osys_iphone.h"
#include "blit_arm.h"

const OSystem::GraphicsMode OSystem_IPHONE::s_supportedGraphicsModes[] = {
      {0, 0, 0}
};

AQCallbackStruct OSystem_IPHONE::s_AudioQueue;
SoundProc OSystem_IPHONE::s_soundCallback = NULL;
void *OSystem_IPHONE::s_soundParam = NULL;
bool OSystem_IPHONE::s_is113OrHigher = false;

OSystem_IPHONE::OSystem_IPHONE() :
      _savefile(NULL), _mixer(NULL), _timer(NULL), _offscreen(NULL),
      _overlayVisible(false), _overlayBuffer(NULL), _fullscreen(NULL),
      _mouseHeight(0), _mouseWidth(0), _mouseBuf(NULL), _lastMouseTap(0),
      _secondaryTapped(false), _lastSecondaryTap(0), _screenOrientation(kScreenOrientationFlippedLandscape),
      _needEventRestPeriod(false), _mouseClickAndDragEnabled(false),
      _gestureStartX(-1), _gestureStartY(-1), _fullScreenIsDirty(false),
      _mouseDirty(false), _timeSuspended(0)
{     
      _queuedInputEvent.type = (Common::EventType)0;
      _lastDrawnMouseRect = Common::Rect(0, 0, 0, 0);
}

OSystem_IPHONE::~OSystem_IPHONE() {
      AudioQueueDispose(s_AudioQueue.queue, true);

      delete _savefile;
      delete _mixer;
      delete _timer;
      delete _offscreen;
      delete _fullscreen;
}

int OSystem_IPHONE::timerHandler(int t) {
      DefaultTimerManager *tm = (DefaultTimerManager *)g_system->getTimerManager();
      tm->handler();
      return t;
}

void OSystem_IPHONE::initBackend() {
      _savefile = new DefaultSaveFileManager();
      _mixer = new Audio::Mixer();
      _timer = new DefaultTimerManager();

      gettimeofday(&_startTime, NULL);

      setSoundCallback(Audio::Mixer::mixCallback, _mixer);
      setTimerCallback(&OSystem_IPHONE::timerHandler, 10);

      OSystem::initBackend();
}     

bool OSystem_IPHONE::hasFeature(Feature f) {
      return false;
}

void OSystem_IPHONE::setFeatureState(Feature f, bool enable) {
}

bool OSystem_IPHONE::getFeatureState(Feature f) {
      return false;
}

const OSystem::GraphicsMode* OSystem_IPHONE::getSupportedGraphicsModes() const {
      return s_supportedGraphicsModes;
}


int OSystem_IPHONE::getDefaultGraphicsMode() const {
      return -1;
}

bool OSystem_IPHONE::setGraphicsMode(const char *mode) {
      return true;
}

bool OSystem_IPHONE::setGraphicsMode(int mode) {
      return true;
}

int OSystem_IPHONE::getGraphicsMode() const {
      return -1;
}

void OSystem_IPHONE::initSize(uint width, uint height) {
      //printf("initSize(%i, %i)\n", width, height);

      _screenWidth = width;
      _screenHeight = height;

      free(_offscreen);
      
      _offscreen = (byte *)malloc(width * height);
      bzero(_offscreen, width * height);

      free(_overlayBuffer);

      int fullSize = _screenWidth * _screenHeight * sizeof(OverlayColor);
      _overlayBuffer = (OverlayColor *)malloc(fullSize);
      clearOverlay();
      
      free(_fullscreen);

      _fullscreen = (uint16 *)malloc(fullSize);
      bzero(_fullscreen, fullSize);
      
      if (_screenOrientation != kScreenOrientationPortrait)
            iPhone_initSurface(height, width, true);
      else
            iPhone_initSurface(width, height, false);

      dirtyFullScreen();
      _mouseVisible = false;
      updateScreen();
}

int16 OSystem_IPHONE::getHeight() {
      return _screenHeight;
}

int16 OSystem_IPHONE::getWidth() {
      return _screenWidth;
}

void OSystem_IPHONE::setPalette(const byte *colors, uint start, uint num) {
      //printf("setPalette()\n");
      const byte *b = colors;

      for (uint i = start; i < start + num; ++i) {
            _palette[i] = RGBToColor(b[0], b[1], b[2]);
            b += 4;
      }
      
      dirtyFullScreen();
}

void OSystem_IPHONE::grabPalette(byte *colors, uint start, uint num) {
      //printf("grabPalette()\n");
}

void OSystem_IPHONE::copyRectToScreen(const byte *buf, int pitch, int x, int y, int w, int h) {
      //printf("copyRectToScreen(%i, %i, %i, %i)\n", x, y, w, h);
      //Clip the coordinates
      if (x < 0) {
            w += x;
            buf -= x;
            x = 0;
      }

      if (y < 0) {
            h += y;
            buf -= y * pitch;
            y = 0;
      }

      if (w > _screenWidth - x) {
            w = _screenWidth - x;
      }

      if (h > _screenHeight - y) {
            h = _screenHeight - y;
      }

      if (w <= 0 || h <= 0)
            return;
      
      if (!_fullScreenIsDirty) {
            _dirtyRects.push_back(Common::Rect(x, y, x + w, y + h));
      }
      
            
      byte *dst = _offscreen + y * _screenWidth + x;
      if (_screenWidth == pitch && pitch == w)
            memcpy(dst, buf, h * w);
      else {
            do {
                  memcpy(dst, buf, w);
                  buf += pitch;
                  dst += _screenWidth;
            } while (--h);
      }
}

void OSystem_IPHONE::addDirtyRect(int16 x, int16 y, int16 w, int16 h) {
      if (_fullScreenIsDirty) {
            return;
      }

      clipRectToScreen(x, y, w, h); 
      _dirtyRects.push_back(Common::Rect(x, y, x + w, y + h));
}

void OSystem_IPHONE::clipRectToScreen(int16 &x, int16 &y, int16 &w, int16 &h) {
      if (x < 0) {
            w += x;
            x = 0;
      }

      if (y < 0) {
            h += y;
            y = 0;
      }

      if (w > _screenWidth - x)
            w = _screenWidth - x;

      if (h > _screenHeight - y)
            h = _screenHeight - y;

      if (w < 0) {
            w = 0;
      }
      
      if (h < 0) {
            h = 0;
      }
}

void OSystem_IPHONE::updateScreen() {
      //printf("updateScreen(): %i dirty rects.\n", _dirtyRects.size());

      if (_dirtyRects.size() == 0 && !_mouseDirty)
            return;
      
      internUpdateScreen();
      _fullScreenIsDirty = false;

      //memcpy(iPhone_getSurface(), _fullscreen, _screenWidth * _screenHeight * 2);

      iPhone_updateScreen();
}

void OSystem_IPHONE::internUpdateScreen() {
      int16 mouseX = _mouseX - _mouseHotspotX;
      int16 mouseY = _mouseY - _mouseHotspotY;
      int16 mouseWidth = _mouseWidth;
      int16 mouseHeight = _mouseHeight;

      clipRectToScreen(mouseX, mouseY, mouseWidth, mouseHeight);
      Common::Rect mouseRect(mouseX, mouseY, mouseX + mouseWidth, mouseY + mouseHeight);

      if (_mouseDirty) {
            if (!_fullScreenIsDirty) {
                  _dirtyRects.push_back(_lastDrawnMouseRect);
                  _dirtyRects.push_back(mouseRect);
            }
            _mouseDirty = false;
            _lastDrawnMouseRect = mouseRect;
      }

      while (_dirtyRects.size()) {
            Common::Rect dirtyRect = _dirtyRects.remove_at(_dirtyRects.size() - 1);

            //printf("Drawing: (%i, %i) -> (%i, %i)\n", dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom);
            int h = dirtyRect.bottom - dirtyRect.top;
            int w = dirtyRect.right - dirtyRect.left;

            if (_overlayVisible) {
                  switch (_screenOrientation) {
                        case kScreenOrientationPortrait: {
                              uint16 *src = (uint16 *)&_overlayBuffer[dirtyRect.top * _screenWidth + dirtyRect.left];
                              uint16 *dst = &_fullscreen[dirtyRect.top * _screenWidth + dirtyRect.left];
                              int x = (dirtyRect.right - dirtyRect.left) * 2;
                              for (int y = h; y > 0; y--) {
                                    memcpy(dst, src, x);
                                    src += _screenWidth;
                                    dst += _screenWidth;
                              }
                              break;
                        }
                        case kScreenOrientationLandscape: {
                              uint16 *src = (uint16 *)&_overlayBuffer[(dirtyRect.bottom - 1) * _screenWidth + dirtyRect.left];
                              uint16 *dst = &_fullscreen[dirtyRect.left * _screenHeight + (_screenHeight - dirtyRect.bottom)];
                              blitLandscapeScreenRect16bpp(dst, src, w, h, -_screenWidth, -_screenHeight);
                              break;
                        }                                         
                        case kScreenOrientationFlippedLandscape: {
                              uint16 *src = (uint16 *)&_overlayBuffer[dirtyRect.top * _screenWidth + dirtyRect.left];
                              uint16 *dst = &_fullscreen[(_screenWidth - dirtyRect.left - 1) * _screenHeight + dirtyRect.top];
                              blitLandscapeScreenRect16bpp(dst, src, dirtyRect.right - dirtyRect.left, h, _screenWidth, _screenHeight);
                              break;
                        }
                  }
            } else {
                  switch (_screenOrientation) {
                        case kScreenOrientationPortrait: {
                              byte  *src = &_offscreen[dirtyRect.top * _screenWidth + dirtyRect.left];
                              uint16 *dst = &_fullscreen[dirtyRect.top * _screenWidth + dirtyRect.left];
                              for (int y = h; y > 0; y--) {
                                    for (int x = w; x > 0; x--)
                                          *dst++ = _palette[*src++];

                                    dst += _screenWidth - w;
                                    src += _screenWidth - w;
                              }
                              break;
                        }
                        case kScreenOrientationLandscape: {
                              byte *src = &_offscreen[(dirtyRect.bottom - 1) * _screenWidth + dirtyRect.left];
                              uint16 *dst = &_fullscreen[dirtyRect.left * _screenHeight + (_screenHeight - dirtyRect.bottom)];
                              blitLandscapeScreenRect8bpp(dst, src, w, h, _palette, -_screenWidth, -_screenHeight);
                              break;
                        }
                        case kScreenOrientationFlippedLandscape: {
                              byte *src = &_offscreen[dirtyRect.top * _screenWidth + dirtyRect.left];
                              uint16 *dst = &_fullscreen[(_screenWidth - dirtyRect.left - 1) * _screenHeight + dirtyRect.top];
                              blitLandscapeScreenRect8bpp(dst, src, w, h, _palette, _screenWidth, _screenHeight);
                              break;
                        }
                  }                 
            }
            
            //draw mouse on top
            if (_mouseVisible && (dirtyRect.intersects(mouseRect))) {
                  int srcX = 0;
                  int srcY = 0;
                  int left = _mouseX - _mouseHotspotX;
                  if (left < 0) {
                        srcX -= left;
                        left = 0;                     
                  }
                  int top = _mouseY - _mouseHotspotY;
                  if (top < 0) {
                        srcY -= top;
                        top = 0;                      
                  }

                  //int right = left + _mouseWidth;
                  int bottom = top + _mouseHeight;
                  if (bottom > _screenWidth)
                        bottom = _screenWidth;

                  int displayWidth = _mouseWidth;
                  if (_mouseWidth + left > _screenWidth)
                        displayWidth = _screenWidth - left;
                  
                  int displayHeight = _mouseHeight;
                  if (_mouseHeight + top > _screenHeight)
                        displayHeight = _screenHeight - top;

                  switch (_screenOrientation) {
                        case kScreenOrientationPortrait: {
                              byte *src = &_mouseBuf[srcY * _mouseWidth + srcX];
                              uint16 *dst = &_fullscreen[top * _screenWidth + left];
                              for (int y = displayHeight; y > srcY; y--) {
                                    for (int x = displayWidth; x > srcX; x--) {
                                          if (*src != _mouseKeyColour)
                                                *dst = _palette[*src];
                                          dst++;
                                          src++;
                                    }
                                    dst += _screenWidth - displayWidth + srcX;
                                    src += _mouseWidth - displayWidth + srcX;
                              }
                              break;
                        }
                        case kScreenOrientationLandscape: {
                              byte *src = &_mouseBuf[(_mouseHeight - 1 - srcY) * _mouseWidth + srcX];
                              uint16 *dst = &_fullscreen[left * _screenHeight + (_screenHeight - bottom + srcY)];
                              for (int x = displayWidth; x > srcX; x--) {
                                    for (int y = displayHeight; y > srcY; y--) {
                                          if (*src != _mouseKeyColour)
                                                *dst = _palette[*src];
                                          dst++;
                                          src -= _mouseWidth;
                                    }
                                    dst -= -_screenHeight + displayHeight - srcY;
                                    src += 1 - (displayHeight - srcY) * -_mouseWidth;
                              }
                              break;
                        }
                        case kScreenOrientationFlippedLandscape: {
                              byte *src = &_mouseBuf[srcY * _mouseWidth + srcX];
                              uint16 *dst = &_fullscreen[(_screenWidth - left - 1) * _screenHeight + top];
                              for (int x = displayWidth; x > srcX; x--) {
                                    for (int y = displayHeight; y > srcY; y--) {
                                          if (*src != _mouseKeyColour)
                                                *dst = _palette[*src];
                                          dst++;
                                          src += _mouseWidth;
                                    }
                                    dst -= _screenHeight + displayHeight - srcY;
                                    src += 1 - (displayHeight - srcY) * _mouseWidth;
                              }
                              break;
                        }
                  }
            }


            uint16 *surface = iPhone_getSurface();
            if (w == _screenWidth && h == _screenHeight)
                  memcpy(surface, _fullscreen, _screenWidth * _screenHeight * 2);
            else {
                  switch (_screenOrientation) {
                        case kScreenOrientationPortrait: {
                              int width = w * 2;
                              int offset = dirtyRect.top * _screenWidth + dirtyRect.left;
                              uint16 *fs = _fullscreen + offset;
                              surface += offset;
                              for (int y = h; y > 0; y--) {
                                    memcpy(surface, fs, width);
                                    surface += _screenWidth;
                                    fs += _screenWidth;
                              }
                              break;
                        }
                        case kScreenOrientationLandscape: {
                              int height = h * 2;
                              int offset = dirtyRect.left * _screenHeight + (_screenHeight - dirtyRect.bottom);
                              uint16 *fs = _fullscreen + offset;
                              surface += offset;
                              for (int x = w; x > 0; x--) {
                                    memcpy(surface, fs, height);
                                    surface += _screenHeight;
                                    fs += _screenHeight;
                              }
                              break;
                        }     
                        case kScreenOrientationFlippedLandscape: {
                              int height = h * 2;
                              int offset = ((_screenWidth - dirtyRect.left - 1) * _screenHeight + dirtyRect.top);
                              uint16 *fs = _fullscreen + offset;
                              surface += offset;
                              for (int x = w; x > 0; x--) {
                                    memcpy(surface, fs, height);
                                    surface -= _screenHeight;
                                    fs -= _screenHeight;
                              }
                              break;
                        }     
                  }
            }
            
            //iPhone_updateScreenRect(dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom );
      }
}

Graphics::Surface *OSystem_IPHONE::lockScreen() {
      //printf("lockScreen()\n");
      
      _framebuffer.pixels = _offscreen;
      _framebuffer.w = _screenWidth;
      _framebuffer.h = _screenHeight;
      _framebuffer.pitch = _screenWidth;
      _framebuffer.bytesPerPixel = 1;

      return &_framebuffer;
}

void OSystem_IPHONE::unlockScreen() {
      //printf("unlockScreen()\n");
      dirtyFullScreen();
}

void OSystem_IPHONE::setShakePos(int shakeOffset) {
      printf("setShakePos(%i)\n", shakeOffset);
}

void OSystem_IPHONE::showOverlay() {
      //printf("showOverlay()\n");
      _overlayVisible = true;
      dirtyFullScreen();
}

void OSystem_IPHONE::hideOverlay() {
      //printf("hideOverlay()\n");
      _overlayVisible = false;
      dirtyFullScreen();
}

void OSystem_IPHONE::clearOverlay() {
      //printf("clearOverlay()\n");
      bzero(_overlayBuffer, _screenWidth * _screenHeight * sizeof(OverlayColor));
      dirtyFullScreen();
}

void OSystem_IPHONE::grabOverlay(OverlayColor *buf, int pitch) {
      //printf("grabOverlay()\n");
      int h = _screenHeight;
      OverlayColor *src = _overlayBuffer;

      do {
            memcpy(buf, src, _screenWidth * sizeof(OverlayColor));
            src += _screenWidth;
            buf += pitch;
      } while (--h);
}

void OSystem_IPHONE::copyRectToOverlay(const OverlayColor *buf, int pitch, int x, int y, int w, int h) {
      //printf("copyRectToOverlay(buf, pitch=%i, x=%i, y=%i, w=%i, h=%i)\n", pitch, x, y, w, h);

      //Clip the coordinates
      if (x < 0) {
            w += x;
            buf -= x;
            x = 0;
      }

      if (y < 0) {
            h += y;
            buf -= y * pitch;
            y = 0;
      }

      if (w > _screenWidth - x)
            w = _screenWidth - x;

      if (h > _screenHeight - y)
            h = _screenHeight - y;

      if (w <= 0 || h <= 0)
            return;

      if (!_fullScreenIsDirty) {
            _dirtyRects.push_back(Common::Rect(x, y, x + w, y + h));          
      }
            
      OverlayColor *dst = _overlayBuffer + (y * _screenWidth + x);
      if (_screenWidth == pitch && pitch == w)
            memcpy(dst, buf, h * w * sizeof(OverlayColor));
      else {
            do {
                  memcpy(dst, buf, w * sizeof(OverlayColor));
                  buf += pitch;
                  dst += _screenWidth;
            } while (--h);
      }
}

int16 OSystem_IPHONE::getOverlayHeight() {
      return _screenHeight;
}

int16 OSystem_IPHONE::getOverlayWidth() {
      return _screenWidth;
}

bool OSystem_IPHONE::showMouse(bool visible) {
      bool last = _mouseVisible;
      _mouseVisible = visible;
      _mouseDirty = true;

      return last;
}

void OSystem_IPHONE::warpMouse(int x, int y) {
      //printf("warpMouse()\n");
      
      _mouseX = x;
      _mouseY = y;
      _mouseDirty = true;
}

void OSystem_IPHONE::dirtyMouseCursor() {
      addDirtyRect(_mouseX - _mouseHotspotX, _mouseY - _mouseHotspotY, _mouseX + _mouseWidth - _mouseHotspotX, _mouseY + _mouseHeight - _mouseHotspotY);    
}

void OSystem_IPHONE::dirtyFullScreen() {
      if (!_fullScreenIsDirty) {
            _dirtyRects.clear();
            _dirtyRects.push_back(Common::Rect(0, 0, _screenWidth, _screenHeight));
            _fullScreenIsDirty = true;
      }
}

void OSystem_IPHONE::setMouseCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor, int cursorTargetScale) {
      //printf("setMouseCursor(%i, %i)\n", hotspotX, hotspotY);

      if (_mouseBuf != NULL && (_mouseWidth != w || _mouseHeight != h)) {
            free(_mouseBuf);
            _mouseBuf = NULL;
      }
      
      if (_mouseBuf == NULL)
            _mouseBuf = (byte *)malloc(w * h);

      _mouseWidth = w;
      _mouseHeight = h;

      _mouseHotspotX = hotspotX;
      _mouseHotspotY = hotspotY;

      _mouseKeyColour = keycolor;
      
      memcpy(_mouseBuf, buf, w * h);

      _mouseDirty = true;
}

bool OSystem_IPHONE::pollEvent(Common::Event &event) {
      //printf("pollEvent()\n");

      long curTime = getMillis();
      
      if (_timerCallback && (curTime >= _timerCallbackNext)) {
            _timerCallback(_timerCallbackTimer);
            _timerCallbackNext = curTime + _timerCallbackTimer;
      }
      
      if (_needEventRestPeriod) {
            // Workaround: Some engines can't handle mouse-down and mouse-up events
            // appearing right after each other, without a call returning no input in between.
            _needEventRestPeriod = false;
            return false;
      }

      if (_queuedInputEvent.type != (Common::EventType)0) {
            event = _queuedInputEvent;
            _queuedInputEvent.type = (Common::EventType)0;
            return true;
      }

      int eventType;
      float xUnit, yUnit;

      if (iPhone_fetchEvent(&eventType, &xUnit, &yUnit)) {
            int x;
            int y;
            switch (_screenOrientation) {
                  case kScreenOrientationPortrait:
                        x = (int)(xUnit * _screenWidth);
                        y = (int)(yUnit * _screenHeight);               
                        break;
                  case kScreenOrientationLandscape:
                        x = (int)(yUnit * _screenWidth);
                        y = (int)((1.0 - xUnit) * _screenHeight);
                        break;
                  case kScreenOrientationFlippedLandscape:
                        x = (int)((1.0 - yUnit) * _screenWidth);
                        y = (int)(xUnit * _screenHeight);
                        break;                  
            }

            switch ((InputEvent)eventType) {
                  case kInputMouseDown:
                        //printf("Mouse down at (%u, %u)\n", x, y);
                        
                        // Workaround: kInputMouseSecondToggled isn't always sent when the
                        // secondary finger is lifted. Need to make sure we get out of that mode.
                        _secondaryTapped = false;

                        warpMouse(x, y);
                        // event.type = Common::EVENT_MOUSEMOVE;
                        // event.mouse.x = _mouseX;
                        // event.mouse.y = _mouseY;

                        if (_mouseClickAndDragEnabled) {
                              event.type = Common::EVENT_LBUTTONDOWN;
                              event.mouse.x = _mouseX;
                              event.mouse.y = _mouseY;
                              return true;
                        } else {                            
                              _lastMouseDown = curTime;
                        }
                        return false;
                        break;
                  case kInputMouseUp:
                        //printf("Mouse up at (%u, %u)\n", x, y);
                        if (_mouseClickAndDragEnabled) {
                              event.type = Common::EVENT_LBUTTONUP;
                              event.mouse.x = _mouseX;
                              event.mouse.y = _mouseY;
                        } else {
                              if (curTime - _lastMouseDown < 250) {
                                    event.type = Common::EVENT_LBUTTONDOWN;
                                    event.mouse.x = _mouseX;
                                    event.mouse.y = _mouseY;

                                    _queuedInputEvent.type = Common::EVENT_LBUTTONUP;
                                    _queuedInputEvent.mouse.x = _mouseX;
                                    _queuedInputEvent.mouse.y = _mouseY;
                                    _lastMouseTap = curTime;
                                    _needEventRestPeriod = true;
                              } else
                                    return false;
                        }

                        break;
                  case kInputMouseDragged:
                        //printf("Mouse dragged at (%u, %u)\n", x, y);
                        if (_secondaryTapped) {
                               if (_gestureStartX == -1 || _gestureStartY == -1) {
                                    return false;
                               }

                              int vecX = (x - _gestureStartX);
                              int vecY = (y - _gestureStartY);
                              int lengthSq =  vecX * vecX + vecY * vecY;
                              //printf("Lengthsq: %u\n", lengthSq);

                              if (lengthSq > 15000) { // Long enough gesture to react upon.
                                    _gestureStartX = -1;
                                    _gestureStartY = -1;
                                    
                                    float vecLength = sqrt(lengthSq);
                                    float vecXNorm = vecX / vecLength;
                                    float vecYNorm = vecY / vecLength;

                                    //printf("Swipe vector: (%.2f, %.2f)\n", vecXNorm, vecYNorm);

                                    if (vecXNorm > -0.50 && vecXNorm < 0.50 && vecYNorm > 0.75) {
                                          // Swipe down
                                          event.type = Common::EVENT_KEYDOWN;
                                          _queuedInputEvent.type = Common::EVENT_KEYUP;

                                          event.kbd.flags = _queuedInputEvent.kbd.flags = 0;
                                          event.kbd.keycode = _queuedInputEvent.kbd.keycode = Common::KEYCODE_F5;
                                          event.kbd.ascii = _queuedInputEvent.kbd.ascii = Common::ASCII_F5;
                                          _needEventRestPeriod = true;
                                    } else if (vecXNorm > -0.50 && vecXNorm < 0.50 && vecYNorm < -0.75) {
                                          // Swipe up
                                          _mouseClickAndDragEnabled = !_mouseClickAndDragEnabled;
                                          const char *dialogMsg;
                                          if (_mouseClickAndDragEnabled)
                                                dialogMsg = "Mouse-click-and-drag mode enabled.";
                                          else
                                                dialogMsg = "Mouse-click-and-drag mode disabled.";
                                          GUI::TimedMessageDialog dialog(dialogMsg, 1500);
                                          dialog.runModal();
                                          return false;
                                    } else if (vecXNorm > 0.75 && vecYNorm >  -0.5 && vecYNorm < 0.5) {
                                          // Swipe right
                                          // _secondaryTapped = !_secondaryTapped;
                                          // _gestureStartX = x;
                                          // _gestureStartY = y;                          
                                          //                                        
                                          // GUI::TimedMessageDialog dialog("Forcing toggle of pressed state.", 1500);
                                          // dialog.runModal();
                                          return false;
                                    } else if (vecXNorm < -0.75 && vecYNorm >  -0.5 && vecYNorm < 0.5) {
                                          // Swipe left
                                          return false;
                                    } else
                                          return false;
                              } else
                                    return false;
                        } else {
                              event.type = Common::EVENT_MOUSEMOVE;
                              event.mouse.x = x;
                              event.mouse.y = y;
                              warpMouse(x, y);
                        }
                        break;
                  case kInputMouseSecondToggled:
                        _secondaryTapped = !_secondaryTapped;
                        //printf("Mouse second at (%u, %u). State now %s.\n", x, y, _secondaryTapped ? "on" : "off");
                        if (_secondaryTapped) {
                              _lastSecondaryDown = curTime;
                              _gestureStartX = x;
                              _gestureStartY = y;
                              if (_mouseClickAndDragEnabled) {
                                    event.type = Common::EVENT_LBUTTONUP;
                                    event.mouse.x = _mouseX;
                                    event.mouse.y = _mouseY;
                                    
                                    _queuedInputEvent.type = Common::EVENT_RBUTTONDOWN;
                                    _queuedInputEvent.mouse.x = _mouseX;
                                    _queuedInputEvent.mouse.y = _mouseY;
                              }
                              else
                                    return false;
                        } else {
                              if (curTime - _lastSecondaryDown < 250 ) {
                                    if (curTime - _lastSecondaryTap < 250 && !_overlayVisible) {
                                          event.type = Common::EVENT_KEYDOWN;
                                          _queuedInputEvent.type = Common::EVENT_KEYUP;
                              
                                          event.kbd.flags = _queuedInputEvent.kbd.flags = 0;
                                          event.kbd.keycode = _queuedInputEvent.kbd.keycode = Common::KEYCODE_ESCAPE;
                                          event.kbd.ascii = _queuedInputEvent.kbd.ascii = Common::ASCII_ESCAPE;   
                                          _needEventRestPeriod = true;  
                                          _lastSecondaryTap = 0;
                                    } else if (!_mouseClickAndDragEnabled) {
                                          event.type = Common::EVENT_RBUTTONDOWN;
                                          event.mouse.x = _mouseX;
                                          event.mouse.y = _mouseY;
                                          _queuedInputEvent.type = Common::EVENT_RBUTTONUP;
                                          _queuedInputEvent.mouse.x = _mouseX;
                                          _queuedInputEvent.mouse.y = _mouseY;
                                          _lastSecondaryTap = curTime;
                                          _needEventRestPeriod = true;
                                    }
                              }
                              if (_mouseClickAndDragEnabled) {
                                    event.type = Common::EVENT_RBUTTONUP;
                                    event.mouse.x = _mouseX;
                                    event.mouse.y = _mouseY;
                              } 
                        } 
                        break;
                  case kInputOrientationChanged:
                        //printf("Orientation: %i", (int)xUnit);

                        ScreenOrientation newOrientation;
                        switch ((int)xUnit) {
                              case 1:
                                    newOrientation = kScreenOrientationPortrait;
                                    break;
                              case 3:
                                    newOrientation = kScreenOrientationLandscape;
                                    break;
                              case 4:
                                    newOrientation = kScreenOrientationFlippedLandscape;
                                    break;
                              default:
                                    return false;
                        }


                        if (_screenOrientation != newOrientation) {
                              _screenOrientation = newOrientation;
                              if (_screenOrientation != kScreenOrientationPortrait)
                                    iPhone_initSurface(_screenHeight, _screenWidth, true);
                              else
                                    iPhone_initSurface(_screenWidth, _screenHeight, false);

                              dirtyFullScreen();
                              updateScreen();
                        }                       
                        break;

                  case kInputApplicationSuspended:
                        suspendLoop();
                        break;

                  case kInputKeyPressed:
                        int keyPressed = (int)xUnit;
                        int ascii = keyPressed;
                        //printf("key: %i\n", keyPressed);

                        // We remap some of the iPhone keyboard keys.
                        // The first ten here are the row of symbols below the numeric keys.
                        switch (keyPressed) {
                              case 45:
                                    keyPressed = Common::KEYCODE_F1;
                                    ascii = Common::ASCII_F1;
                                    break;
                              case 47:
                                    keyPressed = Common::KEYCODE_F2;
                                    ascii = Common::ASCII_F2;
                                    break;
                              case 58:
                                    keyPressed = Common::KEYCODE_F3;
                                    ascii = Common::ASCII_F3;
                                    break;
                              case 59:
                                    keyPressed = Common::KEYCODE_F4;
                                    ascii = Common::ASCII_F4;
                                    break;
                              case 40:
                                    keyPressed = Common::KEYCODE_F5;
                                    ascii = Common::ASCII_F5;
                                    break;
                              case 41:
                                    keyPressed = Common::KEYCODE_F6;
                                    ascii = Common::ASCII_F6;
                                    break;
                              case 36:
                                    keyPressed = Common::KEYCODE_F7;
                                    ascii = Common::ASCII_F7;
                                    break;
                              case 38:
                                    keyPressed = Common::KEYCODE_F8;
                                    ascii = Common::ASCII_F8;
                                    break;
                              case 64:
                                    keyPressed = Common::KEYCODE_F9;
                                    ascii = Common::ASCII_F9;
                                    break;
                              case 34:
                                    keyPressed = Common::KEYCODE_F10;
                                    ascii = Common::ASCII_F10;
                                    break;
                              case 10:
                                    keyPressed = Common::KEYCODE_RETURN;
                                    ascii = Common::ASCII_RETURN;
                                    break;
                        }
                        event.type = Common::EVENT_KEYDOWN;
                        _queuedInputEvent.type = Common::EVENT_KEYUP;

                        event.kbd.flags = _queuedInputEvent.kbd.flags = 0;
                        event.kbd.keycode = _queuedInputEvent.kbd.keycode = (Common::KeyCode)keyPressed;
                        event.kbd.ascii = _queuedInputEvent.kbd.ascii = ascii;
                        _needEventRestPeriod = true;                    
                        break;
                  
                  case kInputSwipe: {
                        Common::KeyCode keycode = Common::KEYCODE_INVALID;
                        switch (_screenOrientation) {
                              case kScreenOrientationPortrait:
                                    switch ((UIViewSwipeDirection)xUnit) {
                                          case kUIViewSwipeUp:
                                                keycode = Common::KEYCODE_UP;
                                                break;
                                          case kUIViewSwipeDown:
                                                keycode = Common::KEYCODE_DOWN;
                                                break;
                                          case kUIViewSwipeLeft:
                                                keycode = Common::KEYCODE_LEFT;
                                                break;
                                          case kUIViewSwipeRight:
                                                keycode = Common::KEYCODE_RIGHT;
                                                break;
                                          default:
                                                return false;
                                    }
                                    break;
                              case kScreenOrientationLandscape:
                                    switch ((UIViewSwipeDirection)xUnit) {
                                          case kUIViewSwipeUp:
                                                keycode = Common::KEYCODE_LEFT;
                                                break;
                                          case kUIViewSwipeDown:
                                                keycode = Common::KEYCODE_RIGHT;
                                                break;
                                          case kUIViewSwipeLeft:
                                                keycode = Common::KEYCODE_DOWN;
                                                break;
                                          case kUIViewSwipeRight:
                                                keycode = Common::KEYCODE_UP;
                                                break;
                                          default:
                                                return false;
                                    }
                                    break;
                              case kScreenOrientationFlippedLandscape:
                                    switch ((UIViewSwipeDirection)xUnit) {
                                          case kUIViewSwipeUp:
                                                keycode = Common::KEYCODE_RIGHT;
                                                break;
                                          case kUIViewSwipeDown:
                                                keycode = Common::KEYCODE_LEFT;
                                                break;
                                          case kUIViewSwipeLeft:
                                                keycode = Common::KEYCODE_UP;
                                                break;
                                          case kUIViewSwipeRight:
                                                keycode = Common::KEYCODE_DOWN;
                                                break;
                                          default:
                                                return false;
                                    }
                                    break;                  
                        }

                        event.kbd.keycode = _queuedInputEvent.kbd.keycode = keycode;
                        event.kbd.ascii = _queuedInputEvent.kbd.ascii = 0;
                        event.type = Common::EVENT_KEYDOWN;
                        _queuedInputEvent.type = Common::EVENT_KEYUP;
                        event.kbd.flags = _queuedInputEvent.kbd.flags = 0;
                        _needEventRestPeriod = true;                          
                        break;
                  }
                  
                  default:
                        break;
            }

            return true;
      }
      return false;
}

void OSystem_IPHONE::suspendLoop() {
      bool done = false;
      int eventType;
      float xUnit, yUnit;
      uint32 startTime = getMillis();

      AudioQueueStop(s_AudioQueue.queue, true);

      while (!done) {
            if (iPhone_fetchEvent(&eventType, &xUnit, &yUnit))
                  if ((InputEvent)eventType == kInputApplicationResumed)
                        done = true;
            usleep(100000);         
      }

      AudioQueueStart(s_AudioQueue.queue, NULL);
      _timeSuspended += getMillis() - startTime;
}

uint32 OSystem_IPHONE::getMillis() {
      //printf("getMillis()\n");

      struct timeval currentTime;
      gettimeofday(&currentTime, NULL);
      return (uint32)(((currentTime.tv_sec - _startTime.tv_sec) * 1000) +
                      ((currentTime.tv_usec - _startTime.tv_usec) / 1000)) - _timeSuspended;
}

void OSystem_IPHONE::delayMillis(uint msecs) {
      //printf("delayMillis(%d)\n", msecs);
      usleep(msecs * 1000);
}

OSystem::MutexRef OSystem_IPHONE::createMutex(void) {
      pthread_mutexattr_t attr;
      pthread_mutexattr_init(&attr);
      pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
      
      pthread_mutex_t *mutex = (pthread_mutex_t *) malloc(sizeof(pthread_mutex_t));
      if (pthread_mutex_init(mutex, &attr) != 0) {
            printf("pthread_mutex_init() failed!\n");
            free(mutex);
            return NULL;
      }
      
      return (MutexRef)mutex;
}

void OSystem_IPHONE::lockMutex(MutexRef mutex) {
      if (pthread_mutex_lock((pthread_mutex_t *) mutex) != 0) {
            printf("pthread_mutex_lock() failed!\n");
      }
}

void OSystem_IPHONE::unlockMutex(MutexRef mutex) {
      if (pthread_mutex_unlock((pthread_mutex_t *) mutex) != 0) {
            printf("pthread_mutex_unlock() failed!\n");
      }
}

void OSystem_IPHONE::deleteMutex(MutexRef mutex) {
      if (pthread_mutex_destroy((pthread_mutex_t *) mutex) != 0) {
            printf("pthread_mutex_destroy() failed!\n");
      } else {
            free(mutex);            
      }
}

void OSystem_IPHONE::AQBufferCallback(void *in, AudioQueueRef inQ, AudioQueueBufferRef outQB) {
      //printf("AQBufferCallback()\n");
      if (s_AudioQueue.frameCount > 0 && s_soundCallback != NULL) {
            outQB->mAudioDataByteSize = 4 * s_AudioQueue.frameCount;
            s_soundCallback(s_soundParam, (byte *)outQB->mAudioData, outQB->mAudioDataByteSize);
            AudioQueueEnqueueBuffer(inQ, outQB, 0, NULL);
      } else
            AudioQueueStop(s_AudioQueue.queue, false);
}

bool OSystem_IPHONE::setSoundCallback(SoundProc proc, void *param) {
      //printf("setSoundCallback()\n");
      s_soundCallback = proc;
      s_soundParam = param;

      s_AudioQueue.dataFormat.mSampleRate = AUDIO_SAMPLE_RATE;
      s_AudioQueue.dataFormat.mFormatID = kAudioFormatLinearPCM;
      s_AudioQueue.dataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
      s_AudioQueue.dataFormat.mBytesPerPacket = 4;
      s_AudioQueue.dataFormat.mFramesPerPacket = 1;
      s_AudioQueue.dataFormat.mBytesPerFrame = 4;
      s_AudioQueue.dataFormat.mChannelsPerFrame = 2;
      s_AudioQueue.dataFormat.mBitsPerChannel = 16;
      s_AudioQueue.frameCount = WAVE_BUFFER_SIZE;

      if (AudioQueueNewOutput(&s_AudioQueue.dataFormat, AQBufferCallback, &s_AudioQueue, 0, kCFRunLoopCommonModes, 0, &s_AudioQueue.queue)) {
            printf("Couldn't set the AudioQueue callback!\n");
            return false;
      }

      uint32 bufferBytes = s_AudioQueue.frameCount * s_AudioQueue.dataFormat.mBytesPerFrame;

      for (int i = 0; i < AUDIO_BUFFERS; i++) {
            if (AudioQueueAllocateBuffer(s_AudioQueue.queue, bufferBytes, &s_AudioQueue.buffers[i])) {
                  printf("Error allocating AudioQueue buffer!\n");
                  return false;
            }

            AQBufferCallback(&s_AudioQueue, s_AudioQueue.queue, s_AudioQueue.buffers[i]);
      }     

      AudioQueueSetParameter(s_AudioQueue.queue, kAudioQueueParam_Volume, 1.0);
      if (AudioQueueStart(s_AudioQueue.queue, NULL)) {
            printf("Error starting the AudioQueue!\n");
            return false;
      }

      return true;
}

void OSystem_IPHONE::clearSoundCallback() {
      debug("clearSoundCallback()\n");
}

int OSystem_IPHONE::getOutputSampleRate() const {
      return AUDIO_SAMPLE_RATE;
}

void OSystem_IPHONE::setTimerCallback(TimerProc callback, int interval) {
      //printf("setTimerCallback()\n");   
      
      if (callback != NULL) {
            _timerCallbackTimer = interval;
            _timerCallbackNext = getMillis() + interval;
            _timerCallback = callback;
      } else
            _timerCallback = NULL;
}

void OSystem_IPHONE::quit() {
}

void OSystem_IPHONE::setWindowCaption(const char *caption) {
}

Common::SaveFileManager *OSystem_IPHONE::getSavefileManager() {
      assert(_savefile);
      return _savefile;
}

Audio::Mixer *OSystem_IPHONE::getMixer() {
      assert(_mixer);
      return _mixer;
}

Common::TimerManager *OSystem_IPHONE::getTimerManager() {
      assert(_timer);
      return _timer;
}

OSystem *OSystem_IPHONE_create() {
      return new OSystem_IPHONE();
}

const char* OSystem_IPHONE::getConfigPath() {
      if (s_is113OrHigher)
            return SCUMMVM_PREFS_PATH;
      else
            return SCUMMVM_OLD_PREFS_PATH;
}

const char* OSystem_IPHONE::getSavePath() {
      if (s_is113OrHigher)
            return SCUMMVM_SAVE_PATH;
      else
            return SCUMMVM_OLD_SAVE_PATH;
}

void OSystem_IPHONE::migrateApp() {
      // Migrate to the new 1.1.3 directory structure, if needed.
      
      FilesystemNode file("/var/mobile");
      if (file.exists() && file.isDirectory()) {
            // We have 1.1.3 or above.
            s_is113OrHigher = true;
            file = FilesystemNode(SCUMMVM_ROOT_PATH);
            if (!file.exists()) {
                  system("mkdir " SCUMMVM_ROOT_PATH);
                  system("mkdir " SCUMMVM_SAVE_PATH);

                  // Copy over the prefs file
                  system("cp " SCUMMVM_OLD_PREFS_PATH " " SCUMMVM_PREFS_PATH);

                  file = FilesystemNode(SCUMMVM_OLD_SAVE_PATH);
                  // Copy over old savegames to the new directory.
                  if (file.exists() && file.isDirectory())              
                        system("cp " SCUMMVM_OLD_SAVE_PATH "/* " SCUMMVM_SAVE_PATH "/");
            }
      }
}

void iphone_main(int argc, char *argv[]) {
      
      OSystem_IPHONE::migrateApp();

      // Redirect stdout and stderr if we're launching from the Springboard.
      if (argc == 2 && strcmp(argv[1], "--launchedFromSB") == 0) {
            FILE *newfp = fopen("/tmp/scummvm.log", "a");
            if (newfp != NULL) {
                  fclose(stdout);
                  fclose(stderr);
                  *stdout = *newfp;
                  *stderr = *newfp;
                  setbuf(stdout, NULL);
                  setbuf(stderr, NULL);   

                  //extern int gDebugLevel;
                  //gDebugLevel = 10;
            }           
      }

      g_system = OSystem_IPHONE_create();
      assert(g_system);

      // Invoke the actual ScummVM main entry point:
      scummvm_main(argc, argv);
      g_system->quit();       // TODO: Consider removing / replacing this!
}

#endif


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