Computes a bounding box in user coordinates covering the area that
would be affected, (the "inked" area), by a
operation given the current path and stroke parameters.
If the current path is empty, returns an empty rectangle ((0,0), (0,0)).
Surface dimensions and clipping are not taken into account.
Note that if the line width is set to exactly zero, then
cairoStrokeExtents will return an empty rectangle. Contrast with
cairoPathExtents which can be used to compute the non-empty
bounds as the line width approaches zero.
cairoStrokeExtents must necessarily do more work to
compute the precise inked areas in light of the stroke parameters,
cairoPathExtents may be more desirable for sake of
performance if 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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