This feels quite a bit slower than the non-QtQuick version. This
makes sense, as there is an additional level of indirection. Instead
of painting directly, we paint into an QImage and turn that into
a QSGTexture.
Ultimately one would think that we should render directly using
QtQuick. Alas, we can't, since that would mean no more printing/
exporting of profiles. How sad.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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