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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
.
- 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).
Here are the possible types of elements in the glyph table:
- string
-
Send the characters in string to the terminal to output
this glyph. This alternative is available on character terminals,
but not under X.
- integer
-
Define this glyph code as an alias for code integer. You can use
an alias to specify a face code for the glyph; see below.
nil
-
This glyph is simple. On an ordinary terminal, the glyph code mod 256
is the character to output. With X, the glyph code mod 256 is the
character to output, and the glyph code divided by 256 specifies the
face id number to use while outputting it. See section Faces.
If a glyph code is greater than or equal to the length of the glyph
table, that code is automatically simple.
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