From 9ada994d5b3bd874e537b0bc9641b925058bdf51 Mon Sep 17 00:00:00 2001
From: "Y. Wang" <y5nw@protonmail.com>
Date: Fri, 13 Sep 2024 11:17:36 +0000
Subject: Avoid unnecessarily updating the driver HUD

This patch avoids sending the driver HUD if it contains the same text
that was previously sent.
---
 advtrains/trainhud.lua | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/advtrains/trainhud.lua b/advtrains/trainhud.lua
index b2744ad..f9f4876 100644
--- a/advtrains/trainhud.lua
+++ b/advtrains/trainhud.lua
@@ -103,18 +103,20 @@ function advtrains.set_trainhud(name, text, driver)
 	if not player then
 	   return
 	end
+	local drivertext = driver or ""
 	local driverhud = {
 		hud_elem_type = "image",
 		name = "ADVTRAINS_DRIVER",
 		position = {x=0.5, y=1},
 		offset = {x=0,y=-170},
-		text = driver or "",
+		text = drivertext,
 		alignment = {x=0,y=-1},
-		scale = {x=1,y=1},}
+		scale = {x=1,y=1},
+	}
 	if not hud then
-		hud = {["driver"]={}}
+		hud = {}
 		advtrains.hud[name] = hud
-		hud.id = player:hud_add({
+		hud.id = player:hud_add {
 			hud_elem_type = "text",
 			name = "ADVTRAINS",
 			number = 0xFFFFFF,
@@ -123,18 +125,23 @@ function advtrains.set_trainhud(name, text, driver)
 			text = text,
 			scale = {x=200, y=60},
 			alignment = {x=0, y=-1},
-		})
-		hud.oldText=text
+		}
 		hud.driver = player:hud_add(driverhud)
+		hud.oldText = text
+		hud.oldDriver = drivertext
 	else
 		if hud.oldText ~= text then
 			player:hud_change(hud.id, "text", text)
 			hud.oldText=text
 		end
 		if hud.driver then
-			player:hud_change(hud.driver, "text", driver or "")
+			if hud.oldDriver ~= drivertext then
+				player:hud_change(hud.driver, "text", drivertext)
+				hud.oldDriver = drivertext
+			end
 		elseif driver then
 			hud.driver = player:hud_add(driverhud)
+			hud.oldDriver = drivertext
 		end
 	end
 end
-- 
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