This handles native data only so far, replacement image still needs
doing.

Change-Id: I5f51bc7d837309fa0b88b277c1b754e435cb4208
Reviewed-on: https://gerrit.libreoffice.org/50778Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>