on modern hardware, these are less efficient than regular alpha
channels.
Also, this greatly simplies the range of stuff that vcl needs to deal
with, which will make the upcoming transparency->alpha patch easier to
deal with.
Enhance vcl::CreateFromData to convert incoming 1-bit data to 8-bit
image.
Change-Id: I35829da750029fe373d0d2911a669d10bab6ad23
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145321
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>