graphics-context-p

Arguments: stream object

Returns t if object is a valid graphics-context for stream, and returns nil otherwise. Currently returns t for any windows-graphics stream with any graphics-context object, but in the future different kinds of stream may require different graphics-contexts. stream should be a cg-stream.

See copy-graphics-context (where all the information in a graphics-context object is described), make-graphics-context, set-graphics-context, and restoring-graphics-context.

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Created 2015.5.21.