FWIW, after thinking about it, I'd suggest to use the simple solution 1 above (KISS) by either moving the buffer into the global space or making it static as a local variable (I'd prefer the latter). In both cases the buffer should be initialized with zeroes (IIRC), otherwise an initializer like { 0 } would do it (untested). This would be well-defined and using color_average() as in the existing code would be an informative example as well.

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