icon2html optimization stuff (#58607)

code/__DEFINES/flags.dm

@@ -62,6 +62,8 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 #define SUPERMATTER_IGNORES_1 (1 << 19)
 /// If a turf can be made dirty at roundstart. This is also used in areas.
 #define CAN_BE_DIRTY_1 (1<<20)
+/// Should we use the initial icon for display? Mostly used by overlay only objects
+#define HTML_USE_INITAL_ICON_1 (1<<21)
 
 // Update flags for [/atom/proc/update_appearance]
 /// Update the atom's name

code/__HELPERS/icon_smoothing.dm

@@ -152,6 +152,7 @@ DEFINE_BITFIELD(smoothing_junction, list(
 //do not use, use QUEUE_SMOOTH(atom)
 /atom/proc/smooth_icon()
 	smoothing_flags &= ~SMOOTH_QUEUED
+	flags_1 |= HTML_USE_INITAL_ICON_1
 	if (!z)
 		CRASH("[type] called smooth_icon() without being on a z-level")
 	if(smoothing_flags & SMOOTH_CORNERS)

code/__HELPERS/icons.dm

@@ -1104,7 +1104,6 @@ GLOBAL_LIST_INIT(freon_color_matrix, list("#2E5E69", "#60A2A8", "#A1AFB1", rgb(0
 /proc/generate_asset_name(file)
 	return "asset.[md5(fcopy_rsc(file))]"
 
-
 /**
  * Converts an icon to base64. Operates by putting the icon in the iconCache savefile,
  * exporting it as text, and then parsing the base64 from that.
@@ -1141,6 +1140,7 @@ GLOBAL_LIST_INIT(freon_color_matrix, list("#2E5E69", "#60A2A8", "#A1AFB1", rgb(0
 		targets = target
 		if (!targets.len)
 			return
+
 	if (!isicon(I))
 		if (isfile(thing)) //special snowflake
 			var/name = sanitize_filename("[generate_asset_name(thing)].png")
@@ -1154,9 +1154,10 @@ GLOBAL_LIST_INIT(freon_color_matrix, list("#2E5E69", "#60A2A8", "#A1AFB1", rgb(0
 		var/atom/A = thing
 
 		I = A.icon
+
 		if (isnull(icon_state))
 			icon_state = A.icon_state
-			if (!(icon_state in icon_states(I, 1)))
+			if (isnull(icon_state) || A.flags_1 & HTML_USE_INITAL_ICON_1)
 				icon_state = initial(A.icon_state)
 				if (isnull(dir))
 					dir = initial(A.dir)

code/game/machinery/doors/airlock.dm

@@ -114,7 +114,7 @@
 	var/air_tight = FALSE //TRUE means density will be set as soon as the door begins to close
 	var/prying_so_hard = FALSE
 
-	flags_1 = RAD_PROTECT_CONTENTS_1 | RAD_NO_CONTAMINATE_1
+	flags_1 = RAD_PROTECT_CONTENTS_1 | RAD_NO_CONTAMINATE_1 | HTML_USE_INITAL_ICON_1
 	rad_insulation = RAD_MEDIUM_INSULATION
 
 	network_id = NETWORK_DOOR_AIRLOCKS