I'm about to go fucking APE

None of this is actually viable, Footprints aren't taking proper color, aren't updating their color. It's just default red. screm

code/datums/components/decals/blood.dm

@@ -9,6 +9,7 @@
 
 /datum/component/decal/blood/generate_appearance(_icon, _icon_state, _dir, _layer, _color)
 	var/obj/item/I = parent
+	I.cut_overlays()
 	if(!_icon)
 		_icon = 'icons/effects/blood.dmi'
 	if(!_icon_state)
@@ -22,10 +23,12 @@
 	var/icon/blood_splatter_icon = icon(initial(I.icon), initial(I.icon_state), , 1)		//we only want to apply blood-splatters to the initial icon_state for each object
 	blood_splatter_icon.Blend("#fff", ICON_ADD) 			//fills the icon_state with white (except where it's transparent)
 	blood_splatter_icon.Blend(icon(_icon, _icon_state), ICON_MULTIPLY) //adds blood and the remaining white areas become transparant
-	pic = mutable_appearance(blood_splatter_icon, initial(I.icon_state))
+//	pic = mutable_appearance(blood_splatter_icon, initial(I.icon_state))
 
-	I.blood_overlay = image(blood_splatter_icon)
+	I.blood_splatter_icon = blood_splatter_icon
+	I.blood_overlay = image(I.blood_splatter_icon)
 	I.blood_overlay.color = I.blood_DNA_to_color()
+	I.update_icon()
 	I.add_overlay(I.blood_overlay)
 
 	return TRUE

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

@@ -17,6 +17,7 @@
 		reagents.add_reagent(gibs_reagent_id, 5)
 	if(gibs_bloodtype)
 		add_blood_DNA(list("Non-human DNA" = gibs_bloodtype))
+		Blood_DNA = add_blood_DNA(list("Non-human DNA" = gibs_bloodtype))
 	update_icon()
 
 

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

@@ -7,8 +7,19 @@
 	blood_state = BLOOD_STATE_BLOOD
 	bloodiness = MAX_SHOE_BLOODINESS
 	color = BLOOD_COLOR_HUMAN //default so we don't have white splotches everywhere.
+	var/list/Blood_DNA = list()
+
+/obj/effect/decal/cleanable/blood/Initialize(mapload, list/datum/disease/diseases)
+	..()
+	get_blood_lists()
+
+/obj/effect/decal/cleanable/blood/proc/get_blood_lists()
+	if(!Blood_DNA.len)
+		Blood_DNA = return_blood_DNA()
 
 /obj/effect/decal/cleanable/blood/replace_decal(obj/effect/decal/cleanable/blood/C)
+	if(C.Blood_DNA)
+		Blood_DNA |= C.Blood_DNA.Copy()
 	C.add_blood_DNA(return_blood_DNA())
 	if (bloodiness)
 		if (C.bloodiness < MAX_SHOE_BLOODINESS)
@@ -51,6 +62,7 @@
 	desc = "Your instincts say you shouldn't be following these."
 	random_icon_states = null
 	var/list/existing_dirs = list()
+	var/list/Blood_DNA = list()
 
 /obj/effect/decal/cleanable/trail_holder/update_icon()
 	color = blood_DNA_to_color()
@@ -81,6 +93,7 @@
 	var/exited_dirs = 0
 	blood_state = BLOOD_STATE_BLOOD //the icon state to load images from
 	var/list/shoe_types = list()
+	var/list/shoe_printer = list()
 
 /obj/effect/decal/cleanable/blood/footprints/Crossed(atom/movable/O)
 	if(ishuman(O))
@@ -112,6 +125,9 @@
 	..()
 	cut_overlays()
 
+	if(shoe_printer)
+		color = shoeblood_DNA_to_color(shoe_printer)
+
 	for(var/Ddir in GLOB.cardinals)
 		if(entered_dirs & Ddir)
 			var/image/bloodstep_overlay = GLOB.bloody_footprints_cache["entered-[blood_state]-[Ddir]"]
@@ -149,6 +165,29 @@
 		return TRUE
 	return FALSE
 
+/obj/effect/decal/cleanable/blood/footprints/proc/shoeblood_DNA_to_color(list/blood_dna)	//handles RGB colorings of bloody shoes
+	var/list/colors = list()//first we make a list of all bloodtypes present
+	for(var/bloop in shoe_printer)
+		if(colors[shoe_printer[bloop]])
+			colors[shoe_printer[bloop]]++
+		else
+			colors[shoe_printer[bloop]] = 1
+
+	var/final_rgb = BLOOD_COLOR_HUMAN
+
+	if(colors.len)
+		var/sum = 0 //this is all shitcode, but it works; trust me
+		final_rgb = bloodtype_to_color(colors[1])
+		sum = colors[colors[1]]
+		if(colors.len > 1)
+			var/i = 2
+			while(i <= colors.len)
+				var/tmp = colors[colors[i]]
+				final_rgb = BlendRGB(final_rgb, bloodtype_to_color(colors[i]), tmp/(tmp+sum))
+				sum += tmp
+				i++
+
+	return final_rgb
 /* Eventually TODO: make snowflake trails like baycode's
 /obj/effect/decal/cleanable/blood/footprints/tracks/shoe
 	name = "footprints"

code/modules/clothing/clothing.dm

@@ -41,6 +41,10 @@
 	var/dynamic_hair_suffix = ""//head > mask for head hair
 	var/dynamic_fhair_suffix = ""//mask > head for facial hair
 
+	//for blood coloration memes
+	var/last_bloodtype	//used to track the last bloodtype to have graced these shoes; makes for better performing footprint shenanigans
+	var/last_blood_DNA	//same as last one
+
 /obj/item/clothing/Initialize()
 	. = ..()
 	if(CHECK_BITFIELD(clothing_flags, VOICEBOX_TOGGLABLE))
@@ -339,3 +343,10 @@ BLIND     // can't see anything
 		deconstruct(FALSE)
 	else
 		..()
+
+/obj/item/clothing/transfer_blood_dna(list/blood_dna)
+	..()
+	var/list/blood_list = list(return_blood_DNA())
+	if(blood_list.len)
+		last_bloodtype = blood_list[blood_list[blood_list.len]]//trust me this works
+		last_blood_DNA = blood_list[blood_list.len]

code/modules/clothing/shoes/_shoes.dm

@@ -19,9 +19,6 @@
 	var/adjusted = NORMAL_STYLE
 	mutantrace_variation = MUTANTRACE_VARIATION
 
-	var/last_bloodtype = ""//used to track the last bloodtype to have graced these shoes; makes for better performing footprint shenanigans
-	var/last_blood_DNA = ""//same as last one
-
 /obj/item/clothing/shoes/ComponentInitialize()
 	. = ..()
 	AddComponent(/datum/component/redirect, list(COMSIG_COMPONENT_CLEAN_ACT = CALLBACK(src, .proc/clean_blood)))
@@ -107,9 +104,3 @@
 
 /obj/item/proc/negates_gravity()
 	return FALSE
-
-/obj/item/clothing/shoes/transfer_blood_dna(list/blood_dna)
-	..()
-	if(blood_dna.len)
-		last_bloodtype = blood_dna[blood_dna[blood_dna.len]]//trust me this works
-		last_blood_DNA = blood_dna[blood_dna.len]

code/modules/clothing/suits/_suits.dm

@@ -55,9 +55,9 @@
 			. += mutable_appearance('icons/effects/item_damage.dmi', "damaged[blood_overlay_type]")
 		IF_HAS_BLOOD_DNA(src)
 			if(taurmode >= SNEK_TAURIC)
-				. += mutable_appearance('modular_citadel/icons/mob/64x32_effects.dmi', "[blood_overlay_type]blood")
+				. += mutable_appearance('modular_citadel/icons/mob/64x32_effects.dmi', "[blood_overlay_type]blood", color = blood_DNA_to_color())
 			else
-				. += mutable_appearance('icons/effects/blood.dmi', "[blood_overlay_type]blood")
+				. += mutable_appearance('icons/effects/blood.dmi', "[blood_overlay_type]blood", color = blood_DNA_to_color())
 		var/mob/living/carbon/human/M = loc
 		if(ishuman(M) && M.w_uniform)
 			var/obj/item/clothing/under/U = M.w_uniform

code/modules/detectivework/detective_work.dm

@@ -78,6 +78,7 @@
 	if(!B)
 		B = new /obj/effect/decal/cleanable/blood/splatter(src, diseases)
 	B.add_blood_DNA(blood_dna) //give blood info to the blood decal.
+	B.update_icon()
 	return TRUE //we bloodied the floor
 
 /mob/living/carbon/human/add_blood_DNA(list/blood_dna, list/datum/disease/diseases)
@@ -112,25 +113,29 @@
 
 //to add blood dna info to the object's blood_DNA list
 /atom/proc/transfer_blood_dna(list/blood_dna)
-	var/list/dna = blood_DNA_length()
-	if(!dna)
-		dna = list()
-	var/old_length = dna.len
-	dna |= blood_dna
-	if(dna.len > old_length)
+	var/list/blood_DNA = return_blood_DNA()
+	if(!blood_DNA)
+		blood_DNA = list()
+	var/old_length = blood_DNA.len
+	blood_DNA |= blood_dna
+	if(blood_DNA.len > old_length)
 		return TRUE//some new blood DNA was added
 
-/atom/proc/blood_DNA_to_color()	//handles RGB colorings of blood
-	var/list/dna = blood_DNA_length()
+/atom/proc/blood_DNA_to_color()
+	return
+
+/obj/effect/decal/cleanable/blood/blood_DNA_to_color()
+	to_chat(world, "blood dna to color called by [src]")
 	var/list/colors = list()//first we make a list of all bloodtypes present
-	for(var/bloop in dna)
-		if(colors[dna[bloop]])
-			colors[dna[bloop]]++
+	for(var/bloop in Blood_DNA)
+		if(colors[Blood_DNA[bloop]])
+			colors[Blood_DNA[bloop]]++
 		else
-			colors[dna[bloop]] = 1
+			colors[Blood_DNA[bloop]] = 1
 
 	var/final_rgb = BLOOD_COLOR_HUMAN
 
+	to_chat(world, "colors has [colors.len] bloodtypes in it")
 	if(colors.len)
 		var/sum = 0 //this is all shitcode, but it works; trust me
 		final_rgb = bloodtype_to_color(colors[1])
@@ -144,3 +149,9 @@
 				i++
 
 	return final_rgb
+
+/obj/item/clothing/blood_DNA_to_color()
+	var/final_rgb = BLOOD_COLOR_HUMAN
+	if(last_bloodtype)
+		final_rgb = bloodtype_to_color(last_bloodtype)
+	return final_rgb

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

@@ -64,6 +64,9 @@
 					FP.blood_state = S.blood_state
 					FP.entered_dirs |= dir
 					FP.bloodiness = S.bloody_shoes[S.blood_state]
+					if(S.last_blood_DNA && S.last_bloodtype)
+						FP.shoe_printer += list(S.last_blood_DNA = S.last_bloodtype)
+						//hacky as heck; we need to move the LAST entry to there, otherwise we mix all the blood
 					FP.add_blood_DNA(S.return_blood_DNA())
 					FP.update_icon()
 					update_inv_shoes()