make yuv_mode a proper enum SjpegYUVMode. #46
Merged
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-> values: SJPEG_YUV_420, SJPEG_YUV_444, SJPEG_YUV_SHARP, SJPEG_AUTO
This is preferable to magic constants.
also add the shortcuts -420 / -444 / -sharp to 'sjpeg'
Change-Id: Ibd308a18d9dfd99b087a7524816b3ad16e66f004