Eedi3: Allow VideoNode to be passed to sclip_aa

#32

vsaa/antialiasers/eedi3.py

@@ -34,17 +34,17 @@ class EEDI3(_Antialiaser):
     opencl: bool = dc_field(default=False, kw_only=True)
 
     mclip: vs.VideoNode | None = None
-    sclip_aa: type[Antialiaser] | Antialiaser | Literal[True] | None = dc_field(
+    sclip_aa: type[Antialiaser] | Antialiaser | Literal[True] | vs.VideoNode | None = dc_field(
         default_factory=lambda: nnedi3.Nnedi3
     )
 
     def __post_init__(self) -> None:
         super().__post_init__()
 
-        self._sclip_aa: Antialiaser | Literal[True] | None
+        self._sclip_aa: Antialiaser | Literal[True] | vs.VideoNode | None
 
-        if self.sclip_aa and self.sclip_aa is not True and not isinstance(self.sclip_aa, Antialiaser):
-            self._sclip_aa = self.sclip_aa()
+        if self.sclip_aa and self.sclip_aa is not True and not isinstance(self.sclip_aa, (Antialiaser, vs.VideoNode)):
+            self._sclip_aa = self.sclip_aa()  # type: ignore[operator]
         else:
             self._sclip_aa = self.sclip_aa  # type: ignore[assignment]
 
@@ -69,9 +69,22 @@ def interpolate(self, clip: vs.VideoNode, double_y: bool, **kwargs: Any) -> vs.V
         aa_kwargs = self.get_aa_args(clip, **kwargs)
 
         if self._sclip_aa and ((('sclip' in kwargs) and not kwargs['sclip']) or 'sclip' not in kwargs):
-            if self._sclip_aa is True:
+            if self._sclip_aa is True or isinstance(self._sclip_aa, vs.VideoNode):
                 if double_y:
-                    raise CustomValueError("You can't pass sclip_aa=True when supersampling!", self.__class__)
+                    if self._sclip_aa is True:
+                        raise CustomValueError("You can't pass sclip_aa=True when supersampling!", self.__class__)
+
+                    expected_dimensions = (clip.width * 2, clip.height * 2)
+                    actual_dimensions = (clip.width, clip.height)
+
+                    if expected_dimensions != actual_dimensions:
+                        raise CustomValueError(
+                            f"The dimensions of sclip_aa ({actual_dimensions[0]}x{actual_dimensions[1]}) "
+                            f"don't match the expected dimensions for supersampling "
+                            f"({expected_dimensions[0]}x{expected_dimensions[1]})!",
+                            self.__class__
+                        )
+
                 aa_kwargs.update(sclip=clip)
             else:
                 sclip_args = self._sclip_aa.get_aa_args(clip, **(dict(mclip=kwargs.get('mclip', None))))