Transform a distance vector from user space to device space. This
function is similar to
cairoUserToDevice except that the
translation components of the CTM will be ignored when transforming
cairoUserToDeviceDistance(cr, dx, dy)
[numeric] X component of a distance vector (in/out parameter)
[numeric] Y component of a distance vector (in/out parameter)
Derived by RGtkGen from GTK+ documentation
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