Computes a bounding box in user coordinates covering the area that
would be affected, (the "inked" area), by a
given the current path and fill parameters. If the current path is
empty, returns an empty rectangle ((0,0), (0,0)). Surface
dimensions and clipping are not taken into account.
cairoPathExtents, which is similar, but returns
non-zero extents for some paths with no inked area, (such as a
simple line segment).
cairoFillExtents must necessarily do more work to
compute the precise inked areas in light of the fill rule, so
cairoPathExtents may be more desirable for sake of performance
if the non-inked path extents are desired.
A list containing the following elements:
[numeric] left of the resulting extents
[numeric] top of the resulting extents
[numeric] right of the resulting extents
[numeric] bottom of the resulting extents
Derived by RGtkGen from GTK+ documentation
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