8.16.0.4
6 Region
Creates a region, optionally specific to dc.
Reports the drawing context that the region is specific to, if any.
Queries the content represented by the region.
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Adds to the region. A path or polygon is implicitly closed.
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Changes the region by applying a combination with another region. The
other region, rgn2, is not modified.
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A region polygon-fill mode.