TITANIC: Add movie _handled flag, simplify frame timinig code

engines/titanic/game_manager.cpp

@@ -192,14 +192,20 @@ void CGameManager::update() {
 }
 
 void CGameManager::updateMovies() {
+	// Initial iteration to mark all the movies as not yet handled
+	for (CMovieList::iterator i = CMovie::_playingMovies->begin();
+			i != CMovie::_playingMovies->end(); ++i)
+		(*i)->_handled = false;
+
 	bool repeatFlag;
 	do {
 		repeatFlag = false;
 
+		// Scan for a movie to process
 		for (CMovieList::iterator i = CMovie::_playingMovies->begin();
-				i != CMovie::_playingMovies->end(); ) {
+				i != CMovie::_playingMovies->end(); ++i) {
 			CMovie *movie = *i;
-			if (movie->_state)
+			if (movie->_handled)
 				continue;
 
 			CMovieEventList eventsList;
@@ -229,8 +235,9 @@ void CGameManager::updateMovies() {
 				eventsList.remove(movieEvent);
 			}
 
+			// Flag the movie as having been handled
+			movie->_handled = true;
 			repeatFlag = true;
-			movie->_state = MSTATE_1;
 			break;
 		}
 	} while (repeatFlag);

engines/titanic/support/avi_surface.cpp

@@ -260,10 +260,13 @@ int AVISurface::getFrame() const {
 	return _decoders[0]->getCurFrame();
 }
 
+bool AVISurface::isFrameReady() const {
+	return _decoders[0]->needsUpdate() && (!_decoders[1] || _decoders[1]->needsUpdate());
+}
+
 bool AVISurface::renderFrame() {
 	// Check there's a frame ready for display
-	assert(_videoSurface);
-	if (!_decoders[0]->needsUpdate() || (_decoders[1] && !_decoders[1]->needsUpdate()))
+	if (!isFrameReady())
 		return false;
 
 	// Decode each decoder's video stream into the appropriate surface

engines/titanic/support/avi_surface.h

@@ -162,6 +162,11 @@ public:
 	 * Duplicates the secondary frame, if the movie has a second video track
 	 */
 	Graphics::ManagedSurface *duplicateSecondaryFrame() const;
+
+	/**
+	 * Returns true if a frame is ready to be rendered
+	 */
+	bool isFrameReady() const;
 };
 
 } // End of namespace Titanic

engines/titanic/support/movie.cpp

@@ -36,7 +36,7 @@ namespace Titanic {
 CMovieList *CMovie::_playingMovies;
 CVideoSurface *CMovie::_movieSurface;
 
-CMovie::CMovie() : ListItem(), _state(MSTATE_0), _field10(0),
+CMovie::CMovie() : ListItem(), _handled(false), _field10(0),
 		_field14(0) {
 }
 
@@ -84,9 +84,6 @@ OSMovie::OSMovie(const CResourceKey &name, CVideoSurface *surface) :
 	_field24 = 0;
 	_field28 = 0;
 	_field2C = 0;
-	_ticksStart = 0;
-	_frameTime1 = 0;
-	_frameTime2 = 17066;
 
 	surface->resize(_aviSurface.getWidth(), _aviSurface.getHeight());
 	_aviSurface.setVideoSurface(surface);
@@ -165,25 +162,13 @@ void OSMovie::setFrame(uint frameNumber) {
 bool OSMovie::handleEvents(CMovieEventList &events) {
 	if (!_aviSurface._isPlaying)
 		return false;
-
-	int time = (g_vm->_events->getTicksCount() + ((_ticksStart << 24) - _ticksStart)) << 8;
-	if (time < _frameTime1)
+	if (!_aviSurface.isFrameReady())
 		return _aviSurface._isPlaying;
 
-	if (!_field14 && (time - _frameTime1) > (_frameTime2 * 2))
-		_frameTime1 = time;
-
-	_frameTime1 += _frameTime2;
-	_aviSurface.handleEvents(events);
-	_videoSurface->setMovieFrameSurface(_aviSurface.getSecondarySurface());
-
-	if (_field14) {
-		while (_frameTime1 >= time && events.empty()) {
-			_aviSurface.handleEvents(events);
-			_videoSurface->setMovieFrameSurface(_aviSurface.getSecondarySurface());
-
-			_frameTime1 += _frameTime2;
-		}
+	// Handle updating the frame
+	while (_aviSurface.isFrameReady()) {
+		_aviSurface.handleEvents(events);
+		_videoSurface->setMovieFrameSurface(_aviSurface.getSecondarySurface());
 	}
 
 	return _aviSurface._isPlaying;
@@ -202,9 +187,6 @@ int OSMovie::getFrame() const {
 }
 
 void OSMovie::movieStarted() {
-	_frameTime1 = _frameTime2 = 256000.0 / _aviSurface._frameRate;
-	_ticksStart = g_vm->_events->getTicksCount();
-
 	if (_aviSurface._hasAudio)
 		_aviSurface._soundManager->movieStarted();
 

engines/titanic/support/movie.h

@@ -32,10 +32,6 @@
 
 namespace Titanic {
 
-enum MovieState { 
-	MSTATE_0 = 0, MSTATE_1 = 1
-};
-
 class CGameObject;
 class CMovie;
 class CSoundManager;
@@ -52,7 +48,7 @@ protected:
 	 */
 	void addToPlayingMovies();
 public:
-	MovieState _state;
+	bool _handled;
 	int _field10;
 	int _field14;
 public:
@@ -158,9 +154,6 @@ private:
 	int _field24;
 	int _field28;
 	int _field2C;
-	int _ticksStart;
-	int _frameTime1;
-	int _frameTime2;
 private:
 	/**
 	 * Called when a movie is started playing