Functions that report whether slides are being collected to be printed (e.g,. to PDF) instead of shown interactively, and whether slides are being collected in condensed mode (which is normally enabled when printing, but also can be enabled separately).

When slides are being accumulated to show interactively, causes the slide viewer to fast-forward to the most recently registered slide as soon as it’s available.

Returns a pict that is like pict, but with metadata that indicates that the pict should be skipped in some epochs in condensed mode, which might be used when printing to PDF form. Metadata is installed via Pict.epoch_set_metadata using the key #'nonarchival.

Creates a pict that renders as pict for printing or other non-interactive contexts, but in Slideshow GUI creates a floating window at the same position as the pict would appear, and callback is called a window handle to initialize the window. The callback function must produce a function of zero arguments, which is called to deinitialize the floating when when the slide changes so that the interactive pict is not longer on the screen.