DRC dc4b900223 TurboJPEG: Add alpha offset array/method ...

Also, set the red/green/blue offsets for TJPF_GRAY to -1 rather than 0.
It was undefined behavior for an application to use those arrays/methods
with TJPF_GRAY anyhow, and this makes it easier for applications to
programmatically detect whether a given pixel format has red, green, and
blue components.

2017-11-17 22:49:07 -06:00

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