From 0ee999dde425fbf9847cfe4dd0056cb5b7f597ab Mon Sep 17 00:00:00 2001
From: adelikat <adelikat@tasvideos.org>
Date: Sat, 7 Feb 2015 15:39:16 +0000
Subject: [PATCH] Lua - drawImage - speed up by caching images instead of
 reading them from disk on every call

---
 .../tools/Lua/Libraries/EmuLuaLibrary.Gui.cs       | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs
index 44d0ee6227..371aa11aa1 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs
@@ -288,6 +288,8 @@ namespace BizHawk.Client.EmuHawk
 			}
 		}
 
+		private readonly Dictionary<string, Image> ImageCache = new Dictionary<string, Image>();
+
 		[LuaMethodAttributes(
 			"drawImage",
 			"draws an image file from the given path at the given coordinate. width and height are optional. If specified, it will resize the image accordingly"
@@ -297,7 +299,17 @@ namespace BizHawk.Client.EmuHawk
 			GlobalWin.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
-				var img = Image.FromFile(path);
+				Image img;
+				if (ImageCache.ContainsKey(path))
+				{
+					img = ImageCache[path];
+				}
+				else
+				{
+					img = Image.FromFile(path);
+					ImageCache.Add(path, img);
+				}
+
 				g.DrawImage(img, x, y, width ?? img.Width, height ?? img.Height);
 			}
 		}