Page 90 Table of Contents Index Page 92
Chapters
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
A, B, C, D, E


CHAPTER 11. TEXT STYLES

=> invoke-with-text-style medium continuation text-style [Generic Function]
Binds the current text style of the medium medium to correspond to the new text style, and
calls the function continuation with the new text style in effect. text-style may either a text style
object or a style spec (that is, a list of the a family, a face code, and a size). continuation is a
function of one argument, the medium; it has dynamic extent.

medium can be a medium, a sheet that supports the sheet output protocol, or a stream that
outputs to such a sheet. All classes that obey the medium protocol must implement a method
for invoke-with-text-style.

=> with-text-family (medium family) &body body [Macro]
=> with-text-face (medium face) &body body [Macro]
=> with-text-size (medium size) &body body [Macro]
Binds the current text style of the medium designated by medium to correspond to a new text
style consisting of the current text style with the new family, face, or size (respectively) merged
in. face, family, and size are as for make-text-style. body is executed with the new text style
in effect.

The medium argument is not evaluated, and must be a symbol that is bound to a sheet or
medium. If medium is t, *standard-output* is used. body may have zero or more declarations
as its first forms.

These macros are "convenience" forms of with-text-style that must expand into calls to
invoke-with-text-style.

11.3 Controlling Text Style Mappings

Text styles are mapped to fonts using the text-style-mapping function, which takes a port, a
character set, and a text style and returns a font object. All ports must implement methods for
the following generic functions, for all classes of text style.

The objects used to represent a font mapping are unspecified and are likely to vary from port to
port. For instance, a mapping might be some sort of font object on one type of port, or might
simply be the name of a font on another.

Minor issue: We still need to describe what a device font is. Ditto, character sets. | SWM

Part of initializing a port is to define the mappings between text styles and font names for the
port's host window system.

=> text-style-mapping port text-style &optional character-set [Generic Function]
Returns the font mapping that will be used when rendering characters in the character set
character-set in the text style text-style on any medium on the port port. If there is no mapping
associated with character-set and text-style on port, then some other object will be returned that
corresponds to the "unmapped" text style.

Page 90 Table of Contents Index Page 92
Chapters
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
A, B, C, D, E