ChromaLocation.from_res: Always return LEFT

The decision to always return LEFT is simple:

Every regular format expects LEFT. The only exception is UHD, but only if that has HDR. SDR streams are explicitly tagged as being LEFT in rips we've checked.

As we've decided with Matrix.from_res, the onus should be on the user to ensure their UHD sources are properly tagged.

vstools/enums/generic.py

@@ -28,7 +28,8 @@ def _missing_(cls: type[ChromaLocation], value: Any) -> ChromaLocation | None:
             return cls.LEFT
 
         if value > cls.BOTTOM:
-            raise UnsupportedChromaLocationError(f'ChromaLocation({value}) is unsupported.', cls)
+            raise UnsupportedChromaLocationError(
+                f'ChromaLocation({value}) is unsupported.', cls)
 
         return None
 
@@ -48,16 +49,6 @@ def from_res(cls, frame: vs.VideoNode | vs.VideoFrame) -> ChromaLocation:
 
         :return:            ChromaLocation object.
         """
-        from .color import Matrix, Primaries, Transfer
-
-        matrix, transfer, primaries = Matrix(frame), Transfer(frame), Primaries(frame)
-
-        if (
-            primaries == Primaries.BT2020
-            or matrix in (Matrix.BT2020CL, Matrix.BT2020NCL)
-            or transfer in (Transfer.BT2020_10, Transfer.BT2020_12)
-        ):
-            return ChromaLocation.TOP_LEFT
 
         return ChromaLocation.LEFT
 
@@ -92,7 +83,8 @@ def get_offsets(
 
         if isinstance(chroma_loc, vs.VideoNode):
             assert chroma_loc.format
-            subsampling = (chroma_loc.format.subsampling_w, chroma_loc.format.subsampling_h)
+            subsampling = (chroma_loc.format.subsampling_w,
+                           chroma_loc.format.subsampling_h)
 
             if subsampling in [(1, 0), (1, 1)]:
                 offsets = (0.5, 0)
@@ -131,7 +123,8 @@ def _missing_(cls: type[FieldBased], value: Any) -> FieldBased | None:
             return cls.PROGRESSIVE
 
         if value > cls.TFF:
-            raise UnsupportedFieldBasedError(f'FieldBased({value}) is unsupported.', cls)
+            raise UnsupportedFieldBasedError(
+                f'FieldBased({value}) is unsupported.', cls)
 
         return None