Add utility from_raw_bgr{,a} for ImageBuffer #2596
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It is one of the most common channel orders other than Rgb and the construction involves nothing complicated, just swapping the channels around. We don't support that layout during computation, where it would complicate significant parts of
Pixel
, but as a helper for transferring a buffer we can easily have both on theRgb{,A}
typed containers.See: #2595 which seems like a paper cut that can be easily and confidently solved.