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color: MDCV min L < maxFALL < maxCLL <= max L

Pekka Paalanen requested to merge pq/wayland-protocols:mr/lllimits into color

These are the logical requirements. Also if the computation of maxFALL and maxCLL follow the ANSI/CTA-861-I Annex P algorithms, then necessarily maxFALL <= maxCLL.

On one hand, making these a protocol requirement causes clients to have to check these themselves and fix things up in any arbitrary way, while the compositors will do the exact same checks to send protocol errors.

On the other hand, clients checking these explicitly gives clients the opportunity to employ a desired fix-up scheme and/or show a UI complaint that the video content metadata is inconsistent. That would be more difficult if only some compositors sent a graceful failure when these requirements are not met.

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