what to do when footprints are being a bitch.

why, we get rid of them :honk:

code/game/atoms.dm

@@ -324,18 +324,14 @@
 	return list("ANIMAL DNA" = "Y-")
 
 /mob/living/carbon/get_blood_dna_list()
-	for(var/bluhduh in GLOB.blood_types)
-		if(get_blood_id() != bluhduh) //are we a null for blood type?
-			var/list/dna_to_add
-			dna_to_add = list("Non-human DNA" = random_blood_type()) //generate a random bloodtype for it.
-			return dna_to_add
-
-		var/list/blood_dna = list()
-		if(dna)
-			blood_dna[dna.unique_enzymes] = dna.blood_type
-		else
-			blood_dna["UNKNOWN DNA"] = "X*"
-		return blood_dna
+	if(get_blood_id() != "blood")
+		return
+	var/list/blood_dna = list()
+	if(dna)
+		blood_dna[dna.unique_enzymes] = dna.blood_type
+	else
+		blood_dna["UNKNOWN DNA"] = "X*"
+	return blood_dna
 
 /mob/living/carbon/alien/get_blood_dna_list()
 	return list("UNKNOWN DNA" = "X*")
@@ -343,7 +339,7 @@
 //to add a mob's dna info into an object's blood_DNA list.
 /atom/proc/transfer_mob_blood_dna(mob/living/L)
 	// Returns 0 if we have that blood already
-	var/list/new_blood_dna = L.get_blood_dna_list()
+	var/new_blood_dna = L.get_blood_dna_list()
 	if(!new_blood_dna)
 		return FALSE
 	var/old_length = blood_DNA_length()
@@ -352,6 +348,15 @@
 		return FALSE
 	return TRUE
 
+//to add blood dna info to the object's blood_DNA list
+/atom/proc/transfer_blood_dna(list/blood_dna)
+	if(!blood_DNA)
+		blood_DNA = list()
+	var/old_length = blood_DNA_length()
+	blood_DNA |= blood_dna
+	if(blood_DNA_length() > old_length)
+		return TRUE//some new blood DNA was added
+
 //to add blood from a mob onto something, and transfer their dna info
 /atom/proc/add_mob_blood(mob/living/M)
 	var/list/blood_dna = M.get_blood_dna_list()

code/game/objects/effects/decals/cleanable/humans.dm

@@ -98,7 +98,7 @@
 		sleep(2)
 		if(i > 0)
 			var/obj/effect/decal/cleanable/blood/splatter/splat = new(loc)
-			splat.transfer_mob_blood_dna(blood_DNA)
+			splat.transfer_blood_dna(blood_DNA)
 		if(!step_to(src, get_step(src, direction), 0))
 			break
 
@@ -158,16 +158,16 @@
 	random_icon_states = null
 	var/entered_dirs = 0
 	var/exited_dirs = 0
+	var/foot_state
 	blood_state = BLOOD_STATE_BLOOD //the icon state to load images from
 	var/list/shoe_types = list()
 
 /obj/effect/decal/cleanable/blood/footprints/Crossed(atom/movable/O)
+	..()
 	if(ishuman(O))
 		var/mob/living/carbon/human/H = O
 		var/obj/item/clothing/shoes/S = H.shoes
 		if(S && S.bloody_shoes[blood_state])
-			if(color != bloodtype_to_color(S.last_bloodtype))
-				return
 			S.bloody_shoes[blood_state] = max(S.bloody_shoes[blood_state] - BLOOD_LOSS_PER_STEP, 0)
 			shoe_types |= S.type
 			if (!(entered_dirs & H.dir))
@@ -175,20 +175,19 @@
 				update_icon()
 
 /obj/effect/decal/cleanable/blood/footprints/Uncrossed(atom/movable/O)
+	..()
 	if(ishuman(O))
 		var/mob/living/carbon/human/H = O
 		var/obj/item/clothing/shoes/S = H.shoes
 		if(S && S.bloody_shoes[blood_state])
-			if(color != bloodtype_to_color(S.last_bloodtype))//last entry - we check its color
-				return
 			S.bloody_shoes[blood_state] = max(S.bloody_shoes[blood_state] - BLOOD_LOSS_PER_STEP, 0)
 			shoe_types  |= S.type
 			if (!(exited_dirs & H.dir))
 				exited_dirs |= H.dir
 				update_icon()
 
+
 /obj/effect/decal/cleanable/blood/footprints/update_icon()
-	..()
 	cut_overlays()
 
 	for(var/Ddir in GLOB.cardinals)
@@ -203,8 +202,7 @@
 				GLOB.bloody_footprints_cache["exited-[blood_state]-[Ddir]"] = bloodstep_overlay = image(icon, "[blood_state]2", dir = Ddir)
 			add_overlay(bloodstep_overlay)
 
-	alpha = BLOODY_FOOTPRINT_BASE_ALPHA + bloodiness
-
+	alpha = BLOODY_FOOTPRINT_BASE_ALPHA+bloodiness
 
 /obj/effect/decal/cleanable/blood/footprints/examine(mob/user)
 	. = ..()

code/modules/mob/living/carbon/human/human_movement.dm

@@ -56,17 +56,18 @@
 				//Bloody footprints
 				var/turf/T = get_turf(src)
 				if(S.bloody_shoes && S.bloody_shoes[S.blood_state])
-					for(var/obj/effect/decal/cleanable/blood/footprints/oldFP in T)
+					for(var/obj/effect/decal/cleanable/blood/tracks/oldFP in T)
 						if (oldFP.blood_state == S.blood_state)
 							return
 					//No oldFP or they're all a different kind of blood
 					S.bloody_shoes[S.blood_state] = max(0, S.bloody_shoes[S.blood_state] - BLOOD_LOSS_PER_STEP)
 					if (S.bloody_shoes[S.blood_state] > BLOOD_LOSS_IN_SPREAD)
-						var/obj/effect/decal/cleanable/blood/footprints/FP = new /obj/effect/decal/cleanable/blood/footprints(T)
+						var/obj/effect/decal/cleanable/blood/tracks/FP = new /obj/effect/decal/cleanable/blood/tracks(T)
 						FP.blood_state = S.blood_state
 						FP.entered_dirs |= dir
 						FP.bloodiness = S.bloody_shoes[S.blood_state] - BLOOD_LOSS_IN_SPREAD
-						FP.add_blood_DNA(S.return_blood_DNA())
+						FP.transfer_blood_dna(S.blood_DNA)
+						FP.color = blood_DNA_to_color() //Color the blood with our dna stuff
 						FP.update_icon()
 					update_inv_shoes()
 				//End bloody footprints