Make OSD scale float to more accurate match system scale

src/BizHawk.Bizware.Graphics/Renderers/StringRenderer.cs

@@ -49,7 +49,7 @@ namespace BizHawk.Bizware.Graphics
 			TexturePages = null;
 		}
 
-		public SizeF Measure(string str, int scale)
+		public SizeF Measure(string str, float scale)
 		{
 			float x = 0;
 			float y = FontInfo.LineHeight * scale;
@@ -92,7 +92,7 @@ namespace BizHawk.Bizware.Graphics
 			return new(Math.Max(x, ox), y);
 		}
 
-		public void RenderString(IGuiRenderer renderer, float x, float y, string str, int scale)
+		public void RenderString(IGuiRenderer renderer, float x, float y, string str, float scale)
 		{
 			if (Owner != renderer.Owner)
 			{
@@ -146,4 +146,4 @@ namespace BizHawk.Bizware.Graphics
 
 		private record TexCoords(float U0, float V0, float U1, float V1);
 	}
-}
+}

src/BizHawk.Client.Common/DisplayManager/Filters/Gui.cs

@@ -615,7 +615,7 @@ namespace BizHawk.Client.Common.Filters
 			var size = FindInput().SurfaceFormat.Size;
 
 			FilterProgram.GuiRenderer.Begin(size.Width, size.Height);
-			var scale = (int)Math.Round(FilterProgram.ControlDpi / 96.0f);
+			var scale = FilterProgram.ControlDpi / 96.0F;
 			var blitter = new OSDBlitter(_font, FilterProgram.GuiRenderer, new(0, 0, size.Width, size.Height), scale);
 			FilterProgram.GuiRenderer.EnableBlending();
 			_manager.DrawScreenInfo(blitter);
@@ -628,7 +628,7 @@ namespace BizHawk.Client.Common.Filters
 			private readonly StringRenderer _font;
 			private readonly IGuiRenderer _renderer;
 
-			public OSDBlitter(StringRenderer font, IGuiRenderer renderer, Rectangle clipBounds, int scale)
+			public OSDBlitter(StringRenderer font, IGuiRenderer renderer, Rectangle clipBounds, float scale)
 			{
 				_font = font;
 				_renderer = renderer;
@@ -648,7 +648,7 @@ namespace BizHawk.Client.Common.Filters
 
 			public Rectangle ClipBounds { get; }
 
-			public int Scale { get; }
+			public float Scale { get; }
 		}
 	}
-}
+}

src/BizHawk.Client.Common/DisplayManager/IBlitter.cs

@@ -15,6 +15,6 @@ namespace BizHawk.Client.Common
 
 		Rectangle ClipBounds { get; }
 
-		public int Scale { get; }
+		public float Scale { get; }
 	}
 }

src/BizHawk.Client.Common/DisplayManager/OSDManager.cs

@@ -141,7 +141,7 @@ namespace BizHawk.Client.Common
 					var line = 1;
 					for (var i = _messages.Count - 1; i >= 0; i--, line++)
 					{
-						var yOffset = (line - 1) * 18 * g.Scale;
+						var yOffset = (int)Math.Round((line - 1) * 18 * g.Scale);
 						if (!_config.Messages.Anchor.IsTop())
 						{
 							yOffset = 0 - yOffset;
@@ -355,4 +355,4 @@ namespace BizHawk.Client.Common
 			}
 		}
 	}
-}
+}