Milian Wolff c882465649 Improve performance of rgb(a) reading, convert directly to greyscale
This again leads to a noticeable performance improvement of the
QZXingFilter example, as we get rid of one full copy of the image
data by converting directly into greyscale, instead of first
converting to RGB and then converting to greyscale.
2017-01-10 13:17:54 +01:00
..
2017-01-10 13:17:54 +01:00