From a4949ff1d5fc591d006d78b8746988f64722ba8c Mon Sep 17 00:00:00 2001
From: RoosterDragon <RoosterDragon@outlook.com>
Date: Sun, 29 May 2016 20:57:45 +0100
Subject: [PATCH] Only check for and render selection bars for actors on
 screen.

This avoids expensive FogObscures checks and saves drawing selections bars for actors that are offscreen anyway.
---
 OpenRA.Game/Graphics/WorldRenderer.cs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/OpenRA.Game/Graphics/WorldRenderer.cs b/OpenRA.Game/Graphics/WorldRenderer.cs
index fbeed0b995..06174d88c2 100644
--- a/OpenRA.Game/Graphics/WorldRenderer.cs
+++ b/OpenRA.Game/Graphics/WorldRenderer.cs
@@ -190,9 +190,12 @@ namespace OpenRA.Graphics
 
 			if (World.Type == WorldType.Regular)
 			{
-				foreach (var g in World.ActorsHavingTrait<Selectable>().Where(a => !a.Disposed
-					&& !World.FogObscures(a)
-					&& !World.Selection.Contains(a)))
+				foreach (var g in World.ScreenMap.ActorsInBox(Viewport.TopLeft, Viewport.BottomRight)
+					.Where(a =>
+						!a.Disposed &&
+						!World.Selection.Contains(a) &&
+						a.Info.HasTraitInfo<SelectableInfo>() &&
+						!World.FogObscures(a)))
 				{
 					if (Game.Settings.Game.StatusBars == StatusBarsType.Standard)
 						new SelectionBarsRenderable(g, false, false).Render(this);