We need a way to distinguish between AA and no AA even if color samples == 1. nr_samples is currently used for that purpose, so it makes sense to use nr_samples for coverage samples. color samples == 1 means that you can store 1 color sample per pixel and other samples are flagged as undefined and can be guessed by looking at neighbors. In special cases, it's possible to get 16x AA quality when color samples == 1.
Marek
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