[metapost] is it possible to strike glyphs' paths?

[Vadim Radionov]

Dear list members,

Is it possible to decompose the picture obtained with btex .. etex and then
draw all the glyphs' paths with (white) pen of non-zero width?
My goal is to make a label on the complex picture more legible, but
unfilling its bbox cuts too much.
The way i use right now is drawing the same picture with white color
shifting it slightly in several directions, but i hope there exists a
correct way to do it.

Thank you in advance,

Vadim
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