Game Game.IsNullInstance a null-safe extension method, and a few other cleanups

BizHawk.Client.EmuHawk/DisplayManager/OSDManager.cs

@@ -293,7 +293,7 @@ namespace BizHawk.Client.EmuHawk
 		/// </summary>
 		public void DrawScreenInfo(IBlitter g)
 		{
-			if (Global.Config.DisplayFrameCounter && !Global.Game.IsNullInstance)
+			if (Global.Config.DisplayFrameCounter && !Global.Game.IsNullInstance())
 			{
 				string message = MakeFrameCounter();
 				float x = GetX(g, Global.Config.DispFrameCx, Global.Config.DispFrameanchor, message);
@@ -307,7 +307,7 @@ namespace BizHawk.Client.EmuHawk
 				}
 			}
 
-			if (Global.Config.DisplayInput && !Global.Game.IsNullInstance)
+			if (Global.Config.DisplayInput && !Global.Game.IsNullInstance())
 			{
 				if ((Global.MovieSession.Movie.IsPlaying && !Global.MovieSession.Movie.IsFinished)
 					|| (Global.MovieSession.Movie.IsFinished && Global.Emulator.Frame == Global.MovieSession.Movie.InputLogLength)) // Account for the last frame of the movie, the movie state is immediately "Finished" here but we still want to show the input

BizHawk.Client.EmuHawk/MainForm.cs

@@ -18,7 +18,6 @@ using BizHawk.Bizware.BizwareGL;
 
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Common.IEmulatorExtensions;
-using BizHawk.Emulation.Cores.Calculators;
 using BizHawk.Emulation.Cores.Consoles.Nintendo.QuickNES;
 using BizHawk.Emulation.Cores.Nintendo.GBA;
 using BizHawk.Emulation.Cores.Nintendo.NES;
@@ -245,8 +244,7 @@ namespace BizHawk.Client.EmuHawk
 				string xmlPath = Path.Combine(PathManager.GetExeDirectoryAbsolute(), "gamedb", "NesCarts.xml");
 				string x7zPath = Path.Combine(PathManager.GetExeDirectoryAbsolute(), "gamedb", "NesCarts.7z");
 				bool loadXml = File.Exists(xmlPath);
-				using (var nesCartFile = new HawkFile(loadXml ? xmlPath : x7zPath))
+				using var nesCartFile = new HawkFile(loadXml ? xmlPath : x7zPath);
-				{
 				if (!loadXml)
 				{
 					nesCartFile.BindFirst();
@@ -255,7 +253,6 @@ namespace BizHawk.Client.EmuHawk
 				return nesCartFile
 					.GetStream()
 					.ReadAllBytes();
-				}
 			};
 			try
 			{
@@ -413,7 +410,7 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				// If user picked a game, then do the commandline logic
-				if (!Global.Game.IsNullInstance)
+				if (!Global.Game.IsNullInstance())
 				{
 					var movie = MovieService.Get(_argParser.cmdMovie);
 					Global.MovieSession.ReadOnly = true;
@@ -440,13 +437,13 @@ namespace BizHawk.Client.EmuHawk
 			}
 			else if (Global.Config.RecentMovies.AutoLoad && !Global.Config.RecentMovies.Empty)
 			{
-				if (Global.Game.IsNullInstance)
+				if (Global.Game.IsNullInstance())
 				{
 					OpenRom();
 				}
 
 				// If user picked a game, then do the autoload logic
-				if (!Global.Game.IsNullInstance)
+				if (!Global.Game.IsNullInstance())
 				{
 					if (File.Exists(Global.Config.RecentMovies.MostRecent))
 					{
@@ -464,7 +461,7 @@ namespace BizHawk.Client.EmuHawk
 				_needsFullscreenOnLoad = true;
 			}
 
-			if (!Global.Game.IsNullInstance)
+			if (!Global.Game.IsNullInstance())
 			{
 				if (_argParser.cmdLoadState != null)
 				{
@@ -1786,7 +1783,7 @@ namespace BizHawk.Client.EmuHawk
 		private void HandlePlatformMenus()
 		{
 			var system = "";
-			if (!Global.Game.IsNullInstance)
+			if (!Global.Game.IsNullInstance())
 			{
 				system = Emulator.SystemId;
 			}
@@ -3015,7 +3012,7 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				bool render = !InvisibleEmulation && (!_throttle.skipNextFrame || (_currAviWriter?.UsesVideo ?? false));
-				bool new_frame = Emulator.FrameAdvance(Global.ControllerOutput, render, renderSound);
+				bool newFrame = Emulator.FrameAdvance(Global.ControllerOutput, render, renderSound);
 
 				Global.MovieSession.HandleMovieAfterFrameLoop();
 
@@ -3054,12 +3051,12 @@ namespace BizHawk.Client.EmuHawk
 					UpdateToolsAfter(SuppressLua);
 				}
 
-				if (!PauseAvi && new_frame && !InvisibleEmulation)
+				if (!PauseAvi && newFrame && !InvisibleEmulation)
 				{
 					AvFrameAdvance();
 				}
 
-				if (new_frame)
+				if (newFrame)
 				{
 					_framesSinceLastFpsUpdate++;
 
@@ -4169,8 +4166,7 @@ namespace BizHawk.Client.EmuHawk
 				return;
 			}
 
-			bool handled;
+			ClientApi.OnBeforeQuickSave(this, quickSlotName, out var handled);
-			ClientApi.OnBeforeQuickSave(this, quickSlotName, out handled);
 			if (handled)
 			{
 				return;
@@ -4244,7 +4240,7 @@ namespace BizHawk.Client.EmuHawk
 			var result = sfd.ShowHawkDialog();
 			if (result == DialogResult.OK)
 			{
-				SaveState(sfd.FileName, sfd.FileName, false);
+				SaveState(sfd.FileName, sfd.FileName);
 			}
 
 			if (GlobalWin.Tools.IsLoaded<TAStudio>())

BizHawk.Client.EmuHawk/tools/MultiDiskBundler/MultiDiskBundler.cs

@@ -31,7 +31,7 @@ namespace BizHawk.Client.EmuHawk
 			AddButton_Click(null, null);
 			AddButton_Click(null, null);
 
-			if (!Global.Game.IsNullInstance &&  !GlobalWin.MainForm.CurrentlyOpenRom.EndsWith(".xml"))
+			if (!Global.Game.IsNullInstance() &&  !GlobalWin.MainForm.CurrentlyOpenRom.EndsWith(".xml"))
 			{
 				if (GlobalWin.MainForm.CurrentlyOpenRom.Contains("|"))
 				{
@@ -240,7 +240,7 @@ namespace BizHawk.Client.EmuHawk
 			string filename = "";
 			string initialDirectory = PathManager.MakeAbsolutePath(Global.Config.PathEntries.MultiDiskBundlesFragment, "Global_NULL");
 
-			if (!Global.Game.IsNullInstance)
+			if (!Global.Game.IsNullInstance())
 			{
 				filename = NameBox.Text;
 				if (string.IsNullOrWhiteSpace(filename))

BizHawk.Emulation.Common/Database/GameInfo.cs

@@ -46,8 +46,6 @@ namespace BizHawk.Emulation.Common
 			NotInDatabase = false
 		};
 
-		public bool IsNullInstance => System == "NULL";
-
 		internal GameInfo(CompactGameInfo cgi)
 		{
 			Name = cgi.Name;
@@ -179,4 +177,12 @@ namespace BizHawk.Emulation.Common
 			}
 		}
 	}
+
+	public static class GameInfoExtensions
+	{
+		public static bool IsNullInstance(this GameInfo game)
+		{
+			return game == null || game.System == "NULL";
+		}
+	}
 }