Some more improvments, removed dview.

This *seems* to be a decent speed up just in the appearent time it takes break all lights to process, and dview wasn't really needed here.

Minor oddies can occur on bigger lights near their edges, but not enough to justify the extra cost.

code/modules/lighting/lighting_corner.dm

@@ -27,7 +27,7 @@ GLOBAL_LIST_INIT(LIGHTING_CORNER_DIAGONAL, list(NORTHEAST, SOUTHEAST, SOUTHWEST,
 
 /datum/lighting_corner/New(var/turf/new_turf, var/diagonal)
 	. = ..()
-
+	masters = list()
 	masters[new_turf] = turn(diagonal, 180)
 	z = new_turf.z
 

code/modules/lighting/lighting_source.dm

@@ -232,7 +232,7 @@
 	else
 		var/P = get_turf_pixel(top_atom)
 		if (P != pixel_turf)
-			pixel_turf = get_turf_pixel(top_atom)
+			pixel_turf = P
 			update = TRUE
 
 	if (light_range && light_power && !applied)
@@ -256,13 +256,15 @@
 	var/thing
 	var/datum/lighting_corner/C
 	var/turf/T
-
-	FOR_DVIEW(T, Ceiling(light_range), source_turf, 0)
-		for (thing in T.get_corners(source_turf))
-			C = thing
-			corners[C] = 0
-		turfs += T
-	FOR_DVIEW_END
+	if (source_turf)
+		var/oldlum = source_turf.luminosity
+		source_turf.luminosity = Ceiling(light_range)
+		for(T in view(Ceiling(light_range), source_turf))
+			for (thing in T.get_corners(source_turf))
+				C = thing
+				corners[C] = 0
+			turfs += T
+		source_turf.luminosity = oldlum
 
 	LAZYINITLIST(affecting_turfs)
 	var/list/L = turfs - affecting_turfs // New turfs, add us to the affecting lights of them.