cairoClipPreserve: cairoClipPreserve
Description
Establishes a new clip region by intersecting the current clip
region with the current path as it would be filled by cairoFill
and according to the current fill rule (see cairoSetFillRule).Usage
cairoClipPreserve(cr)
Details
Unlike cairoClip, cairoClipPreserve preserves the path within
the cairo context.
The current clip region affects all drawing operations by
effectively masking out any changes to the surface that are outside
the current clip region.
Calling cairoClipPreserve can only make the clip region smaller, never
larger. But the current clip is part of the graphics state, so a
temporary restriction of the clip region can be achieved by
calling cairoClipPreserve within a cairoSave/cairoRestore
pair. The only other means of increasing the size of the clip
region is cairoResetClip.