FFmpeg

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Niklas Haas 43f1189af7 swscale/ops_optimizer: eliminate unnecessary dither indices

Generates a lot of incremental diffs due to things like ignored alpha
planes or chroma planes that are not actually modified.

e.g.

 bgr24 -> gbrap10be:
   [ u8 XXXX -> +++X] SWS_OP_READ         : 3 elem(s) packed >> 0
   [ u8 ...X -> +++X] SWS_OP_CONVERT      : u8 -> f32
   [f32 ...X -> ...X] SWS_OP_SCALE        : * 341/85
-  [f32 ...X -> ...X] SWS_OP_DITHER       : 16x16 matrix + {2 3 0 5}
+  [f32 ...X -> ...X] SWS_OP_DITHER       : 16x16 matrix + {2 3 0 -1}
   [f32 ...X -> ...X] SWS_OP_MIN          : x <= {1023 1023 1023 1023}
   [f32 ...X -> +++X] SWS_OP_CONVERT      : f32 -> u16
   [u16 ...X -> zzzX] SWS_OP_SWAP_BYTES
   [u16 ...X -> zzzX] SWS_OP_SWIZZLE      : 1023
   [u16 ...X -> zzz+] SWS_OP_CLEAR        : {_ _ _ 65283}
   [u16 .... -> zzz+] SWS_OP_WRITE        : 4 elem(s) planar >> 0
     (X = unused, z = byteswapped, + = exact, 0 = zero)

Signed-off-by: Niklas Haas <git@haasn.dev>

2026-02-26 13:09:14 +00:00