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A glyph is a generalization of a character; it stands for an image that takes up a single character position on the screen. Glyphs are represented in Lisp as integers, just as characters are.
The meaning of each integer, as a glyph, is defined by the glyph
table, which is the value of the variable glyph-table
.
The value of this variable is the current glyph table. It should be a vector; the gth element defines glyph code g. If the value is
nil
instead of a vector, then all glyphs are simple (see below). The glyph table is not used on windowed displays.
Here are the possible types of elements in the glyph table:
nil
If a glyph code is greater than or equal to the length of the glyph table, that code is automatically simple.