From d6682faeee0fcb7dd5c2b559b513091b3c6ec563 Mon Sep 17 00:00:00 2001
From: Paul Chote <pchote@users.noreply.github.com>
Date: Mon, 23 Jul 2018 15:33:05 +0100
Subject: [PATCH] Keep a 1px border around trimmed ShpTD data.

---
 OpenRA.Mods.Common/SpriteLoaders/ShpTDLoader.cs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/OpenRA.Mods.Common/SpriteLoaders/ShpTDLoader.cs b/OpenRA.Mods.Common/SpriteLoaders/ShpTDLoader.cs
index 0473a0516a..bce428371d 100644
--- a/OpenRA.Mods.Common/SpriteLoaders/ShpTDLoader.cs
+++ b/OpenRA.Mods.Common/SpriteLoaders/ShpTDLoader.cs
@@ -108,6 +108,19 @@ namespace OpenRA.Mods.Common.SpriteLoaders
 					}
 				}
 
+				// Keep a 1px empty border to work avoid rounding issues in the gpu shader
+				if (left > 0)
+					left -= 1;
+
+				if (top > 0)
+					top -= 1;
+
+				if (right < origSize.Width - 1)
+					right += 1;
+
+				if (bottom < origSize.Height - 1)
+					bottom += 1;
+
 				var trimmedWidth = right - left + 1;
 				var trimmedHeight = bottom - top + 1;