no gray conversion needed for VCL alpha hacks

AlphaMask doesn't need any conversion to gray, it's just enough
to make sure the alpha channel bitmap is 8bpp. And the conversion
is needed for the separate-OutputDevice-alpha hacks, where
GetBitmap() gives non-8bpp bitmap for the alpha contents, but there
all the R,G,B channels are the same, so just take red and avoid
pointless conversion.

Change-Id: Ib30fc8fa6d05067d582402ab2c0fcfb49a3742f2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/91772
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

0 files changed, 0 insertions, 0 deletions