add components_per_format, bytes_per_type #318
Merged
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read_pixels defines
pixels len: COMPSIZE(format,type,width,height)
, and this PR provides such function.based on: https://github.com/servo/sparkle/blob/a61f94fff95d29e93721cdbfc4b5dde8671a6970/src/lib.rs#L2636