Painting frames around textured glass - any tips?

[smp50]

It's tricky enough painting around flat glass, for windows and doors - but now I'm faced with some very bumpy textured glass, like this:

http://t3.gstatic.com/images?q=tbn:ANd9GcR3zycNqfkX1-1Mnkt2RO6knk4LAPfFTNO9BNGjD17Nxv7_MMQ1

Are there any clever ways to achieve a straight edge against this? It's on an inside door so I don't need to be so careful about sealing the joint. I thought about painting it as best I can (in white, in this case) and then running a bead of caulk or sealant down to give a final straight edge - but this just suffers the same fate as the paint and ends up being distributed into the topography of the glass.

My next idea is to apply thin pre-painted strips of wood around the edge of the glass, as a secondary bit of trim, so that I never actually paint on wood while it is against the glass. However, I suppose that this won't sit flat against the glass (because the glass itself is not flat!) and may not look right.

Any ideas or do I just have to be really, really careful?

Thanks

 

[Gazman16]

Have you tried Frog tape? I haven't tried it myself but this is the sort of thing they advertise their tape for.

Or you could try masking tape (really well stuck into all the little bumps) with a small bead of caulk (again really well worked in) then paint and pull off the tape.

If you do try Frog take let us know if it was any good.