C++ MovieData::truncateAt方法代码示例

//.........这里部分代码省略.........

	Post-movie savestate event

    * Whan a savestate is loaded and is determined that the savestate-movie length is less than the savestate framecount then it is a post-movie savestate. These occur when a savestate was made during Movie Finished mode. 
	* If read+write, the entire savestate movie will be loaded and replace current movie.
    * If read-only, the savestate movie will be discarded
    * Mode will be switched to Move Finished
    * Savestate will be loaded
    * Current framecount changes to savestate framecount
    * User will have control of input as if Movie inactive mode 
	*/


	if(movieMode != MOVIEMODE_INACTIVE)
	{
		//handle moviefile mismatch
		if(tempMovieData.guid != currMovieData.guid)
		{
			//mbg 8/18/08 - this code  can be used to turn the error message into an OK/CANCEL
			#if defined(WIN32) && !defined(WXPORT)
				std::string msg = "There is a mismatch between savestate's movie and current movie.\ncurrent: " + currMovieData.guid.toString() + "\nsavestate: " + tempMovieData.guid.toString() + "\n\nThis means that you have loaded a savestate belonging to a different movie than the one you are playing now.\n\nContinue loading this savestate anyway?";
				int result = MessageBox(MainWindow->getHWnd(),msg.c_str(),"Error loading savestate",MB_OKCANCEL);
				if(result == IDCANCEL)
					return false;
			#else
				FCEU_PrintError("Mismatch between savestate's movie and current movie.\ncurrent: %s\nsavestate: %s\n",currMovieData.guid.toString().c_str(),tempMovieData.guid.toString().c_str());
				return false;
			#endif
		}

		closeRecordingMovie();

		if(!movie_readonly)
		{
			currMovieData = tempMovieData;
			currMovieData.rerecordCount = currRerecordCount;
		}

		if(currFrameCounter > (int)currMovieData.records.size())
		{
			// if the frame counter is longer than our current movie,
			// switch to "finished" mode.
			// this is a mode that behaves like "inactive"
			// except it permits switching to play/record by loading an earlier savestate.
			// (and we continue to store the finished movie in savestates made while finished)
			osd->setLineColor(255,0,0); // let's make the text red too to hopefully catch the user's attention a bit.
			FinishPlayback();
			osd->setLineColor(255,255,255);

			//FCEU_PrintError("Savestate is from a frame (%d) after the final frame in the movie (%d). This is not permitted.", currFrameCounter, currMovieData.records.size()-1);
			//return false;
		}
		else if(movie_readonly)
		{
			//-------------------------------------------------------------
			//this code would reload the movie from disk. allegedly it is helpful to hexers, but
			//it is way too slow with dsm format. so it is only here as a reminder, and in case someone
			//wants to play with it
			//-------------------------------------------------------------
			//{
			//	fstream fs (curMovieFilename);
			//	if(!LoadFM2(tempMovieData, &fs, INT_MAX, false))
			//	{
			//		FCEU_PrintError("Failed to reload DSM after loading savestate");
			//	}
			//	fs.close();
			//	currMovieData = tempMovieData;
			//}
			//-------------------------------------------------------------

			movieMode = MOVIEMODE_PLAY;
		}
		else
		{
		//	#ifdef _S9XLUA_H
		//	if(!FCEU_LuaRerecordCountSkip())
				currRerecordCount++;
		//	#endif
			
			currMovieData.rerecordCount = currRerecordCount;
			currMovieData.truncateAt(currFrameCounter);

			openRecordingMovie(curMovieFilename);
			if(!osRecordingMovie)
			{
			   osd->setLineColor(255, 0, 0);
			   osd->addLine("Can't save movie file!");
			}

			//printf("DUMPING MOVIE: %d FRAMES\n",currMovieData.records.size());
			currMovieData.dump(osRecordingMovie, false);
			movieMode = MOVIEMODE_RECORD;
		}
	}
	
	load_successful = true;
	freshMovie = false;

	return true;
}

//the main interaction point between the emulator and the movie system.
//either dumps the current joystick state or loads one state from the movie
void FCEUMOV_AddInputState()
{
#if defined(WIN32) && !defined(DINGUX)
	if (movieMode == MOVIEMODE_TASEDITOR)
	{
		// if movie length is less or equal to currFrame, pad it with empty frames
		if (((int)currMovieData.records.size() - 1) < (currFrameCounter + 1))
			currMovieData.insertEmpty(-1, (currFrameCounter + 1) - ((int)currMovieData.records.size() - 1));

		MovieRecord* mr = &currMovieData.records[currFrameCounter];
		if (isTaseditorRecording())
		{
			// record commands and buttons
			mr->commands |= _currCommand;
			joyports[0].log(mr);
			joyports[1].log(mr);
			recordInputByTaseditor();
		}
		// replay buttons
		joyports[0].load(mr);
		joyports[1].load(mr);
		// replay commands
		if (mr->command_power())
			PowerNES();
		if (mr->command_reset())
			ResetNES();
		if (mr->command_fds_insert())
			FCEU_FDSInsert();
		if (mr->command_fds_select())
			FCEU_FDSSelect();
		if (mr->command_vs_insertcoin())
			FCEU_VSUniCoin();
		_currCommand = 0;
	} else
#endif
	if (movieMode == MOVIEMODE_PLAY)
	{
		//stop when we run out of frames
		if (currFrameCounter >= (int)currMovieData.records.size())
		{
			FinishPlayback();
			//tell all drivers to poll input and set up their logical states
			for(int port=0;port<2;port++)
				joyports[port].driver->Update(port,joyports[port].ptr,joyports[port].attrib);
			portFC.driver->Update(portFC.ptr,portFC.attrib);
		} else
		{
			MovieRecord* mr = &currMovieData.records[currFrameCounter];

			//reset and power cycle if necessary
			if(mr->command_power())
				PowerNES();
			if(mr->command_reset())
				ResetNES();
			if(mr->command_fds_insert())
				FCEU_FDSInsert();
			if(mr->command_fds_select())
				FCEU_FDSSelect();
			if (mr->command_vs_insertcoin())
				FCEU_VSUniCoin();

			joyports[0].load(mr);
			joyports[1].load(mr);
		}

		//if we are on the last frame, then pause the emulator if the player requested it
		if (currFrameCounter == currMovieData.records.size()-1)
		{
			if(FCEUD_PauseAfterPlayback())
			{
				FCEUI_ToggleEmulationPause();
			}
		}

		//pause the movie at a specified frame
		if (FCEUMOV_ShouldPause() && FCEUI_EmulationPaused()==0)
		{
			FCEUI_ToggleEmulationPause();
			FCEU_DispMessage("Paused at specified movie frame",0);
		}

	} else if (movieMode == MOVIEMODE_RECORD)
	{
		MovieRecord mr;

		joyports[0].log(&mr);
		joyports[1].log(&mr);
		mr.commands = _currCommand;
		_currCommand = 0;

		//Adelikat: in normal mode, this is done at the time of loading a savestate in read+write mode
		//If the user chooses it can be delayed to here
		if (fullSaveStateLoads && (currFrameCounter < (int)currMovieData.records.size()))
			currMovieData.truncateAt(currFrameCounter);

		mr.dump(&currMovieData, osRecordingMovie,currMovieData.records.size());	// to disk

		currMovieData.records.push_back(mr);
//.........这里部分代码省略.........

//.........这里部分代码省略.........

	Playback, Recording + Read+write

    * Check that GUID of movie and savestate-movie must match or else error
          o on error: a message informing that the savestate doesn't belong to this movie. This is a GUID mismatch error. Give user a choice to load it anyway.
                + failstate: if use declines, loadstate attempt canceled, movie can resume as if not attempted (stop movie if resume fails)canceled, movie can resume if backup savestates enabled else stopmovie
    * Check that savestate framcount <= savestate movie length. If not this is a post-movie savestate
          o on post-movie: See post-movie event section. 
    * savestate passed all error checks and will now be loaded in its entirety and replace movie (note: there will be no truncation yet)
    * current framecount will be set to savestate framecount
    * on the next frame of input, movie will be truncated to framecount
          o (note: savestate-movie can be a future event of the movie timeline, or a completely new timeline and it is still allowed) 
    * Rerecord count of movie will be incremented
    * Movie is now in record mode 

	Post-movie savestate event

    * Whan a savestate is loaded and is determined that the savestate-movie length is less than the savestate framecount then it is a post-movie savestate. These occur when a savestate was made during Movie Finished mode. 
	* If read+write, the entire savestate movie will be loaded and replace current movie.
    * If read-only, the savestate movie will be discarded
    * Mode will be switched to Move Finished
    * Savestate will be loaded
    * Current framecount changes to savestate framecount
    * User will have control of input as if Movie inactive mode 
	*/


	if(movieMode == MOVIEMODE_PLAY || movieMode == MOVIEMODE_RECORD)
	{
		//handle moviefile mismatch
/*		if(tempMovieData.guid != currMovieData.guid)
		{
			//mbg 8/18/08 - this code  can be used to turn the error message into an OK/CANCEL
			#ifdef WIN32
				//std::string msg = "There is a mismatch between savestate's movie and current movie.\ncurrent: " + currMovieData.guid.toString() + "\nsavestate: " + tempMovieData.guid.toString() + "\n\nThis means that you have loaded a savestate belonging to a different movie than the one you are playing now.\n\nContinue loading this savestate anyway?";
				//extern HWND pwindow;
				//int result = MessageBox(pwindow,msg.c_str(),"Error loading savestate",MB_OKCANCEL);
				//if(result == IDCANCEL)
				//	return false;
			#else
				DisplayMessage("Mismatch between savestate's movie and current movie.\ncurrent: %s\nsavestate: %s\n",currMovieData.guid.toString().c_str(),tempMovieData.guid.toString().c_str());
				return false;
			#endif
		}*/

		closeRecordingMovie();

		if(movie_readonly)
		{
			//-------------------------------------------------------------
			//this code would reload the movie from disk. allegedly it is helpful to hexers, but
			//it is way too slow with dsm format. so it is only here as a reminder, and in case someone
			//wants to play with it
			//-------------------------------------------------------------
			//{
			//	fstream fs (curMovieFilename);
			//	if(!LoadMC2(tempMovieData, &fs, INT_MAX, false))
			//	{
			//		MDFN_PrintError("Failed to reload DSM after loading savestate");
			//	}
			//	fs.close();
			//	currMovieData = tempMovieData;
			//}
			//-------------------------------------------------------------

			//if the frame counter is longer than our current movie, then error
			if(currFrameCounter > (int)currMovieData.records.size())
			{
				MDFN_PrintError("Savestate is from a frame (%d) after the final frame in the movie (%d). This is not permitted.", currFrameCounter, currMovieData.records.size()-1);
				return false;
			}

			movieMode = MOVIEMODE_PLAY;
		}
		else
		{
			//truncate before we copy, just to save some time
			tempMovieData.truncateAt(currFrameCounter);
			currMovieData = tempMovieData;

			currRerecordCount++;
			
			currMovieData.rerecordCount = currRerecordCount;

			openRecordingMovie(curMovieFilename);
			currMovieData.dump(osRecordingMovie, false);
			movieMode = MOVIEMODE_RECORD;
		}
	}
	
	load_successful = true;
	freshMovie = false;

	//// Maximus: Show the last input combination entered from the
	//// movie within the state
	//if(current!=0) // <- mz: only if playing or recording a movie
	//	memcpy(&cur_input_display, joop, 4);

	return true;
}

//.........这里部分代码省略.........
						FCEUI_StopMovie();
					}

					return false;
				}
			#else
				if (!backupSavestates) //If backups are disabled we can just resume normally since we can't restore so stop movie and inform user
				{
					FCEU_PrintError("Mismatch between savestate's movie and current movie.\ncurrent: %s\nsavestate: %s\nUnable to restore backup, movie playback stopped.\n",currMovieData.guid.toString().c_str(),tempMovieData.guid.toString().c_str());
					FCEUI_StopMovie();
				}
				else
				FCEU_PrintError("Mismatch between savestate's movie and current movie.\ncurrent: %s\nsavestate: %s\n",currMovieData.guid.toString().c_str(),tempMovieData.guid.toString().c_str());

				return false;
			#endif
		}

		closeRecordingMovie();

		if (movie_readonly)
		{
			// currFrameCounter at this point represents the savestate framecount
			int frame_of_mismatch = CheckTimelines(tempMovieData, currMovieData);
			if (frame_of_mismatch >= 0)
			{
				// Wrong timeline, do apprioriate logic here
				if (!backupSavestates)	//If backups are disabled we can just resume normally since we can't restore so stop movie and inform user
				{
					FCEU_PrintError("Error: Savestate not in the same timeline as movie!\nFrame %d branches from current timeline\nUnable to restore backup, movie playback stopped.", frame_of_mismatch);
					FCEUI_StopMovie();
				} else
					FCEU_PrintError("Error: Savestate not in the same timeline as movie!\nFrame %d branches from current timeline", frame_of_mismatch);
				return false;
			} else if (movieMode == MOVIEMODE_FINISHED
				&& currFrameCounter > (int)currMovieData.records.size()
				&& currMovieData.records.size() == tempMovieData.records.size())
			{
				// special case (in MOVIEMODE_FINISHED mode)
				// allow loading post-movie savestates that were made after finishing current movie

			} else if (currFrameCounter > (int)currMovieData.records.size())
			{
				// this is future event state, don't allow it
				//TODO: turn frame counter to red to get attention
				if (!backupSavestates)	//If backups are disabled we can just resume normally since we can't restore so stop movie and inform user
				{
					FCEU_PrintError("Error: Savestate is from a frame (%d) after the final frame in the movie (%d). This is not permitted.\nUnable to restore backup, movie playback stopped.", currFrameCounter, currMovieData.records.size()-1);
					FCEUI_StopMovie();
				} else
					FCEU_PrintError("Savestate is from a frame (%d) after the final frame in the movie (%d). This is not permitted.", currFrameCounter, currMovieData.records.size()-1);
				return false;
			} else if (currFrameCounter > (int)tempMovieData.records.size())
			{
				// this is post-movie savestate, don't allow it
				//TODO: turn frame counter to red to get attention
				if (!backupSavestates)	//If backups are disabled we can just resume normally since we can't restore so stop movie and inform user
				{
					FCEU_PrintError("Error: Savestate is from a frame (%d) after the final frame in the savestated movie (%d). This is not permitted.\nUnable to restore backup, movie playback stopped.", currFrameCounter, tempMovieData.records.size()-1);
					FCEUI_StopMovie();
				} else
					FCEU_PrintError("Savestate is from a frame (%d) after the final frame in the savestated movie (%d). This is not permitted.", currFrameCounter, tempMovieData.records.size()-1);
				return false;
			} else
			{
				// Finally, this is a savestate file for this movie
				movieMode = MOVIEMODE_PLAY;
			}
		} else
		{
			//Read+Write mode
			if (currFrameCounter > (int)tempMovieData.records.size())
			{
				//This is a post movie savestate, handle it differently
				//Replace movie contents but then switch to movie finished mode
				currMovieData = tempMovieData;
				openRecordingMovie(curMovieFilename);
				currMovieData.dump(osRecordingMovie, false/*currMovieData.binaryFlag*/);
				FinishPlayback();
			} else
			{
				//truncate before we copy, just to save some time, unless the user selects a full copy option
				if (!fullSaveStateLoads)
					//we can only assume this here since we have checked that the frame counter is not greater than the movie data
					tempMovieData.truncateAt(currFrameCounter);
				
				currMovieData = tempMovieData;
				FCEUMOV_IncrementRerecordCount();
				openRecordingMovie(curMovieFilename);
				currMovieData.dump(osRecordingMovie, false/*currMovieData.binaryFlag*/);
				movieMode = MOVIEMODE_RECORD;

			}
		}
	}

	load_successful = true;

	return true;
}

static bool FCEUMOV_ReadState(std::istream* is, uint32 size)
{
	load_successful = false;

	//a little rule: cant load states in read+write mode with a movie from an archive.
	//so we are going to switch it to readonly mode in that case
	if(!movie_readonly 
		//*&& FCEU_isFileInArchive(curMovieFilename)*/
		) {
		FCEU_PrintError("Cannot loadstate in Read+Write with movie from archive. Movie is now Read-Only.");
		movie_readonly = true;
	}

	MovieData tempMovieData = MovieData();
	std::ios::pos_type curr = is->tellg();
	if(!LoadFM2(tempMovieData, is, size, false)) {
		
		/*is->seekg((uint32)curr+size);
		extern bool FCEU_state_loading_old_format;
		if(FCEU_state_loading_old_format) {
			if(movieMode == MOVIEMODE_PLAY || movieMode == MOVIEMODE_RECORD) {
				FCEUI_StopMovie();			
				FCEU_PrintError("You have tried to use an old savestate while playing a movie. This is unsupported (since the old savestate has old-format movie data in it which can't be converted on the fly)");
			}
		}*/
		return false;
	}

	//complex TAS logic for when a savestate is loaded:
	//----------------
	//if we are playing or recording and toggled read-only:
	//  then, the movie we are playing must match the guid of the one stored in the savestate or else error.
	//  the savestate is assumed to be in the same timeline as the current movie.
	//  if the current movie is not long enough to get to the savestate's frame#, then it is an error. 
	//  the movie contained in the savestate will be discarded.
	//  the emulator will be put into play mode.
	//if we are playing or recording and toggled read+write
	//  then, the movie we are playing must match the guid of the one stored in the savestate or else error.
	//  the movie contained in the savestate will be loaded into memory
	//  the frames in the movie after the savestate frame will be discarded
	//  the in-memory movie will have its rerecord count incremented
	//  the in-memory movie will be dumped to disk as fcm.
	//  the emulator will be put into record mode.
	//if we are doing neither:
	//  then, we must discard this movie and just load the savestate


	if(movieMode == MOVIEMODE_PLAY || movieMode == MOVIEMODE_RECORD)
	{
		//handle moviefile mismatch
		if(tempMovieData.guid != currMovieData.guid)
		{
			//mbg 8/18/08 - this code  can be used to turn the error message into an OK/CANCEL
			#ifdef WIN32
				//std::string msg = "There is a mismatch between savestate's movie and current movie.\ncurrent: " + currMovieData.guid.toString() + "\nsavestate: " + tempMovieData.guid.toString() + "\n\nThis means that you have loaded a savestate belonging to a different movie than the one you are playing now.\n\nContinue loading this savestate anyway?";
				//extern HWND pwindow;
				//int result = MessageBox(pwindow,msg.c_str(),"Error loading savestate",MB_OKCANCEL);
				//if(result == IDCANCEL)
				//	return false;
			#else
				FCEU_PrintError("Mismatch between savestate's movie and current movie.\ncurrent: %s\nsavestate: %s\n",currMovieData.guid.toString().c_str(),tempMovieData.guid.toString().c_str());
				return false;
			#endif
		}

		closeRecordingMovie();

		if(movie_readonly)
		{
			//if the frame counter is longer than our current movie, then error
			if(currFrameCounter > (int)currMovieData.records.size())
			{
				FCEU_PrintError("Savestate is from a frame (%d) after the final frame in the movie (%d). This is not permitted.", currFrameCounter, currMovieData.records.size()-1);
				return false;
			}
			movieMode = MOVIEMODE_PLAY;
		}
		else
		{
			//truncate before we copy, just to save some time
			tempMovieData.truncateAt(currFrameCounter);
			currMovieData = tempMovieData;
			
			#ifdef _S9XLUA_H
			if(!FCEU_LuaRerecordCountSkip())
				currRerecordCount++;
			#endif
			
			currMovieData.rerecordCount = currRerecordCount;

			openRecordingMovie(curMovieFilename);
			currMovieData.dump(osRecordingMovie, false);
			movieMode = MOVIEMODE_RECORD;
		}
	}
	
	load_successful = true;

	//// Maximus: Show the last input combination entered from the
	//// movie within the state
//.........这里部分代码省略.........