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color: Add enum definitions of code points

Victoria Brekenfeld requested to merge Drakulix/wayland-protocols:color-enum into color

Enumerations for color primaries and transfer function as per discussion in wayland-protocols/!14.

The color primaries enum tries to use common names of color spaces, where they exist. It has no equivalent of the following H273 code points:

  • smpte_240m (7) is a variant equal to ntsc (6).
  • ebu3213 (22) is apparently revoked in a newer version of H273 (that I was not able to find): https://github.com/AOMediaCodec/libavif/issues/879, which results in a defined color space with no recognized name. Since it is not used anywhere it is not a useful color space. The real ebu3213 is equivalent to pal (5) and would not be included separately like smpte_240m.

A couple of color spaces could instead be reasonably named after ITU specs:

  • srgb -> bt709
  • pal_m -> bt407
  • pal -> bt601-652
  • ntsc -> bt601-525

The transfer function enumeration is mostly taken from !36 (closed). H273 references have been added.

Naming of the enumerations and related methods is probably worthy of a bike-shed. I didn't want to use cicp given this isn't strictly H237, so the protocol now refers to these values as "named primaries" and "named transfer functions".

Edited by Victoria Brekenfeld

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