Improve ATL syntax

use the dedicated xycenter property
avoid setting the previous end-interpolation values before starting the new one, to avoid a jump if the player advances too quickly (also shortens the code)
add subpixel True, even though it doesn't seem very effective
prepare improvement in next renpy version

game/scripts/cg/common.rpy

@@ -1,4 +1,3 @@
-
 init 5 python:
     def her_cg_doll(st, at):
         return hermione.image, None
@@ -25,35 +24,21 @@ image CG cho_doll = DynamicDisplayable(cho_cg_doll)
 image CG ast_doll = DynamicDisplayable(ast_cg_doll)
 image CG sus_doll = DynamicDisplayable(sus_cg_doll)
 
-image CG luna = Fixed(
+transform CG_masker(child):
-    "images/CG/common/bg.webp",
+    contains:
-    AlphaMask(Composite((2160, 1200), (880, -180), Transform("CG lun_doll", zoom=1.2)), "images/CG/common/mask.webp"),
+        "images/CG/common/bg.webp"
+    contains:
+        AlphaMask(
+            Fixed(Transform(child, zoom=1.2, pos=(880, -180)), xfit=True, yfit=True),
+            "images/CG/common/mask.webp",
         )
 
-image CG hermione = Fixed(
+image CG luna = At("CG lun_doll", CG_masker)
-    "images/CG/common/bg.webp",
+image CG hermione = At("CG her_doll", CG_masker)
-    AlphaMask(Composite((2160, 1200), (880, -180), Transform("CG her_doll", zoom=1.2)), "images/CG/common/mask.webp"),
+image CG tonks = At("CG ton_doll", CG_masker)
-    )
+image CG cho = At("CG cho_doll", CG_masker)
-
+image CG astoria = At("CG ast_doll", CG_masker)
-image CG tonks = Fixed(
+image CG susan = At("CG sus_doll", CG_masker)
-    "images/CG/common/bg.webp",
-    AlphaMask(Composite((2160, 1200), (880, -180), Transform("CG ton_doll", zoom=1.2)), "images/CG/common/mask.webp"),
-    )
-
-image CG cho = Fixed(
-    "images/CG/common/bg.webp",
-    AlphaMask(Composite((2160, 1200), (880, -180), Transform("CG cho_doll", zoom=1.2)), "images/CG/common/mask.webp"),
-    )
-
-image CG astoria = Fixed(
-    "images/CG/common/bg.webp",
-    AlphaMask(Composite((2160, 1200), (880, -180), Transform("CG ast_doll", zoom=1.2)), "images/CG/common/mask.webp"),
-    )
-
-image CG susan = Fixed(
-    "images/CG/common/bg.webp",
-    AlphaMask(Composite((2160, 1200), (880, -180), Transform("CG sus_doll", zoom=1.2)), "images/CG/common/mask.webp"),
-    )
 
 # Snape CG
 screen snape_groping():

game/scripts/characters/luna/events/intro.rpy

@@ -71,24 +71,21 @@ label luna_intro_E1:
 
     $ luna.set_face(mouth="soft", eyes="closed", eyebrows="low", pupils="mid")
     show CG luna as cg zorder 17:
-        align (0.5, 0.5)
+        xycenter (-520, -300)
-        pos (-520, -300)
     with fade
 
     gen "Who is--"
     show CG luna as cg zorder 17:
-        align (0.5, 0.5)
+        subpixel True
-        pos (-520, -300)
         easein_quad 5.0 pos (-520, 150)
 
     gen "... A girl?"
     lun "*Mmh*"
 
     show CG luna as cg zorder 17:
+        subpixel True
         zoom 1.0
-        align (0.5, 0.5)
+        easein_quad 3.0 align (.0, .0) pos (0, 0) zoom 0.5 # pos (0, 0) not necessary in next renpy version
-        pos (-520, 150)
-        easein_quad 3.0 align (0.0, 0.0) pos (0, 0) zoom 0.5
 
     gen "What are you doing in my office?"
     gen "Did Snape send you here? Surely--"