Allow mods to downscale framebuffer resolution for large world viewports.

OpenRA.Mods.Common/Widgets/Logic/PerfDebugLogic.cs

@@ -46,7 +46,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 				return $"FPS: {fps}\nTick {Game.LocalTick} @ {PerfHistory.Items["tick_time"].Average(Game.Settings.Debug.Samples):F1} ms\n" +
 					$"Render {Game.RenderFrame} @ {PerfHistory.Items["render"].Average(Game.Settings.Debug.Samples):F1} ms\n" +
 					$"Batches: {PerfHistory.Items["batches"].LastValue}\n" +
-					$"Viewport Size: {viewportSize.Width} x {viewportSize.Height}\n" +
+					$"Viewport Size: {viewportSize.Width} x {viewportSize.Height} / {Game.Renderer.WorldDownscaleFactor}\n" +
 					$"WFB Size: {wfbSize.Width} x {wfbSize.Height}";
 			};
 		}