Snouts push masks out a bit (#94640)

## About The Pull Request

If you have a snout (and it isn't already handled elsewhere by your
species), masks will now be pushed 1 whole pixel up and away from you
when facing left or right.

Examples (TOP IS OLD, BOTTOM IS NEW)

(did you know the welding visor has the lizard's snout sticking out the
front)?

<img width="441" height="357" alt="image"
src="https://github.com/user-attachments/assets/5d703afc-2541-4789-956c-f27dc3fdcf31"
/>

I also tried moving it up one tile too, but it didn't look as nice. (To
be clear, these are not the ones being used, the above screenshot is)
(once again top row is old, bottom row is new)

<img width="1443" height="493" alt="image"
src="https://github.com/user-attachments/assets/c7193237-39fb-466b-9dcd-f5db2a646628"
/>
<img width="1138" height="490" alt="image"
src="https://github.com/user-attachments/assets/398154df-3e56-4f59-b350-24a9c9ea04a1"
/>


## Why It's Good For The Game

I think this makes masks fit snouted faces a little bit better?
Currently they sorta clip into the face which is a little bad imo.

## Changelog

🆑
add: Masks now fit snouted species a little bit better, maybe.
/🆑

code/__DEFINES/inventory.dm

@@ -163,14 +163,12 @@ DEFINE_BITFIELD(no_equip_flags, list(
 #define DIGITIGRADE_STYLE 2
 
 //Flags (actual flags, fucker ^) for /obj/item/var/supports_variations_flags
-/// No alternative sprites or handling based on bodytype
-#define CLOTHING_NO_VARIATION (1<<0)
 /// Has a sprite for digitigrade legs specifically.
-#define CLOTHING_DIGITIGRADE_VARIATION (1<<1)
+#define CLOTHING_DIGITIGRADE_VARIATION (1<<0)
 /// The sprite works fine for digitigrade legs as-is.
-#define CLOTHING_DIGITIGRADE_VARIATION_NO_NEW_ICON (1<<2)
+#define CLOTHING_DIGITIGRADE_VARIATION_NO_NEW_ICON (1<<1)
 /// Auto-generates the leg portion of the sprite with GAGS
-#define CLOTHING_DIGITIGRADE_MASK (1<<3)
+#define CLOTHING_DIGITIGRADE_MASK (1<<2)
 
 /// All variation flags which render "correctly" on a digitigrade leg setup
 #define DIGITIGRADE_VARIATIONS (CLOTHING_DIGITIGRADE_VARIATION|CLOTHING_DIGITIGRADE_VARIATION_NO_NEW_ICON|CLOTHING_DIGITIGRADE_MASK)

code/_globalvars/bitfields.dm

@@ -533,7 +533,6 @@ DEFINE_BITFIELD(head_flags, list(
 ))
 
 DEFINE_BITFIELD(supports_variations_flags, list(
-	"CLOTHING_NO_VARIATION" = CLOTHING_NO_VARIATION,
 	"CLOTHING_DIGITIGRADE_VARIATION" = CLOTHING_DIGITIGRADE_VARIATION,
 	"CLOTHING_DIGITIGRADE_VARIATION_NO_NEW_ICON" = CLOTHING_DIGITIGRADE_VARIATION_NO_NEW_ICON,
 	"CLOTHING_DIGITIGRADE_MASK" = CLOTHING_DIGITIGRADE_MASK,

code/modules/clothing/under/jobs/civilian/clown_mime.dm

@@ -31,7 +31,7 @@
 	inhand_icon_state = "clown"
 	female_sprite_flags = FEMALE_UNIFORM_TOP_ONLY
 	can_adjust = FALSE
-	supports_variations_flags = CLOTHING_NO_VARIATION
+	supports_variations_flags = NONE
 
 /obj/item/clothing/under/rank/civilian/clown/Initialize(mapload)
 	. = ..()

code/modules/clothing/under/shorts.dm

@@ -10,7 +10,7 @@
 	gender = PLURAL
 	body_parts_covered = GROIN
 	female_sprite_flags = NO_FEMALE_UNIFORM
-	supports_variations_flags = CLOTHING_NO_VARIATION
+	supports_variations_flags = NONE
 	can_adjust = FALSE
 	species_exception = list(/datum/species/golem)
 	flags_1 = IS_PLAYER_COLORABLE_1

code/modules/surgery/bodyparts/worn_feature_offset.dm

@@ -19,7 +19,6 @@
 	list/offset_y = list("south" = 0),
 )
 	attached_part.feature_offsets[feature_key] = src
-	owner = attached_part.owner
 	src.attached_part = attached_part
 	src.feature_key = feature_key
 	src.offset_x = offset_x
@@ -28,13 +27,20 @@
 	if (length(offset_x) <= 1 && length(offset_y) <= 1)
 		return // We don't need to do any extra signal handling
 
-	if (!isnull(owner))
-		changed_owner(owner)
+	changed_owner(owner, attached_part.owner)
 	RegisterSignal(attached_part, COMSIG_BODYPART_CHANGED_OWNER, PROC_REF(changed_owner))
 
+/datum/worn_feature_offset/Destroy(force)
+	attached_part.feature_offsets -= feature_key
+	attached_part = null
+	changed_owner(null, null)
+	return ..()
+
 /// Returns the current offset which should be used for this feature
 /datum/worn_feature_offset/proc/get_offset()
 	var/current_dir = owner ? owner.dir : SOUTH
+	if(ISDIAGONALDIR(current_dir))
+		current_dir = current_dir & (EAST|WEST)
 	current_dir = dir2text(current_dir)
 	var/x = length(offset_x) ? ((current_dir in offset_x) ? offset_x[current_dir] : offset_x["south"]) : 0
 	var/y = length(offset_y) ? ((current_dir in offset_y) ? offset_y[current_dir] : offset_y["south"]) : 0
@@ -49,9 +55,11 @@
 /// When the owner of the bodypart changes, update our signal registrations
 /datum/worn_feature_offset/proc/changed_owner(obj/item/bodypart/part, mob/living/new_owner, mob/living/old_owner)
 	SIGNAL_HANDLER
+	if(isnull(old_owner))
+		old_owner = owner
 	owner = new_owner
 	if (!isnull(old_owner))
-		UnregisterSignal(old_owner, COMSIG_ATOM_POST_DIR_CHANGE)
+		UnregisterSignal(old_owner, list(COMSIG_ATOM_POST_DIR_CHANGE, COMSIG_QDELETING))
 	if (!isnull(new_owner))
 		RegisterSignal(new_owner, COMSIG_ATOM_POST_DIR_CHANGE, PROC_REF(on_dir_change))
 		RegisterSignal(new_owner, COMSIG_QDELETING, PROC_REF(on_owner_deleted))

code/modules/surgery/organs/external/_visual_organs.dm

@@ -163,6 +163,24 @@ Unlike normal organs, we're actually inside a persons limbs at all times
 
 	organ_flags = parent_type::organ_flags | ORGAN_EXTERNAL
 
+	/// Offset to apply to equipment worn on the mouth we give to the head.
+	var/datum/worn_feature_offset/worn_mask_offset
+
+/obj/item/organ/snout/on_bodypart_insert(obj/item/bodypart/head/limb)
+	. = ..()
+	if(isnull(limb.worn_mask_offset))
+		worn_mask_offset = limb.worn_mask_offset = new(
+			attached_part = limb,
+			feature_key = OFFSET_FACEMASK,
+			offset_x = list("east" = 1, "west" = -1),
+		)
+
+/obj/item/organ/snout/on_bodypart_remove(obj/item/bodypart/head/limb, movement_flags)
+	if(worn_mask_offset)
+		QDEL_NULL(worn_mask_offset)
+		limb.worn_mask_offset = null
+	return ..()
+
 /datum/bodypart_overlay/mutant/snout
 	layers = EXTERNAL_ADJACENT
 	feature_key = FEATURE_SNOUT