[Bug 746247] div255 implementation is incorrect

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746247

--- Comment #1 from Jan Schmidt <thaytan at noraisin.net> ---
Created attachment 299453
  --> https://bugzilla.gnome.org/attachment.cgi?id=299453&action=edit
Fix div255w implementation

The current implementation of div255w produces incorrect
off-by-one values for a large number of values in the input
range. Use a better bit-shifting implementation that gets it
right, and document that it doesn't work for 0xffff

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