a cairo_region_t, in the same coordinate system as widget->allocation. That is, relative to widget->window for NO_WINDOW widgets; relative to the parent window of widget->window for widgets with their own window.
A newly allocated region holding the intersection of widget and region. The coordinates of the return value are relative to widget->window for NO_WINDOW widgets, and relative to the parent window of widget->window for widgets with their own window.
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Computes the intersection of a widget's area and region, returning the intersection. The result may be empty, use cairo_region_is_empty() to check.