As far as I see, the surfaces created in the DX canvas are of
D3DFMT_A8R8G8B8 or D3DFMT_X8R8G8B8 format, which means that the bytes
(in memory order, on little-endian Windows) are B,G,R,A/X. So if the
desired destination wants R,G,B,A, we need to swap the blue and red
bytes.

Let's hope this doesn't break anything else...

Change-Id: I1b90d2cf95418f6557cac633ec6fce27599e8a61
Reviewed-on: https://gerrit.libreoffice.org/20161Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>