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The issue is that every le/be pair ends up with a swapped op list:
rgb24 -> rgb48be:
[ u8 XXXX -> +++X] SWS_OP_READ : 3 elem(s) packed >> 0
[ u8 ...X -> +++X] SWS_OP_CONVERT : u8 -> u16 (expand)
- [u16 ...X -> zzzX] SWS_OP_SWAP_BYTES
- [u16 ...X -> zzzX] SWS_OP_WRITE : 3 elem(s) packed >> 0
+ [u16 ...X -> +++X] SWS_OP_WRITE : 3 elem(s) packed >> 0
(X = unused, z = byteswapped, + = exact, 0 = zero)
rgb24 -> rgb48le:
[ u8 XXXX -> +++X] SWS_OP_READ : 3 elem(s) packed >> 0
[ u8 ...X -> +++X] SWS_OP_CONVERT : u8 -> u16 (expand)
- [u16 ...X -> +++X] SWS_OP_WRITE : 3 elem(s) packed >> 0
+ [u16 ...X -> zzzX] SWS_OP_SWAP_BYTES
+ [u16 ...X -> zzzX] SWS_OP_WRITE : 3 elem(s) packed >> 0
(X = unused, z = byteswapped, + = exact, 0 = zero)
I'm not sure of a good work-around that's not needlessly difficult to
implement, so just disable it on BE platforms for now. The actual underlying
conversions should still be covered by the sws-unscaled test.