Set a mask on an existing viewport or grob

Source: R/viewport.R

Set a mask on an existing viewport or grob

igc_mask(x, mask)

Arguments

x

viewport or grob with a viewport

mask

One of "none" (or FALSE) or "inherit" (or TRUE) or a grob (or a gTree). This specifies that the viewport should have no mask, or it should inherit the mask of its parent, or it should have its own mask, as described by the grob.