nfontmetrics

Arguments: stream fontmetrics

Modifies as necessary and returns the specified fontmetrics object so it describes the current font of stream.

This destructive version of fontmetrics may be useful for avoiding consing a lot of fontmetrics objects if frequent calls are required; this could be done by calling make-fontmetrics just once to create a single utility fontmetrics object, and then passing it to nfontmetrics each time a call to this function is needed (using the object temporarily within a single process where re-entrancy is not an issue).

See also Text and Fonts in cg-drawing.htm.

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Created 2019.8.20.