| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
Arguments: window
Returns (or sets with setf) whether the "empty" areas of a character
will be left as they were when they are drawn. If nil
(which is the default), then drawing a character
on the window will also draw the window's background color to fill the
parts of the character cell that are not drawn in the
foreground color to form the character. If true,
then these empty areas will be left alone, so that any content that
was previously drawn on the window will show through the characters.
Note: in earlier versions of the documentation, this function was documented to work with dashed lines as well as characters. That was incorrect. This function does not work with dashed lines.
The value is important for functions like draw-string-in-box.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |