@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999
-@c Free Software Foundation, Inc.
+@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2002
+@c Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.
@setfilename ../info/frames
@node Frames, Positions, Windows, Top
* Display Feature Testing:: Determining the features of a terminal.
@end menu
- @xref{Display}, for information about the related topic of
+ @xref{Display}, for information about the related topic of
controlling Emacs redisplay.
@node Creating Frames
the frame appear with the wrong ones and then change to the specified
ones. If that bothers you, you can specify the same geometry and
appearance with X resources; those do take effect before the frame is
-created. @xref{Resources X,, X Resources, emacs, The GNU Emacs Manual}.
+created. @xref{X Resources,, X Resources, emacs, The GNU Emacs Manual}.
X resource settings typically apply to all frames. If you want to
specify some X resources solely for the sake of the initial frame, and
@code{mono}.
@item cursor-type
-The way to display the cursor. The legitimate values are @code{bar},
-@code{box}, and @code{(bar . @var{width})}. The symbol @code{box}
-specifies an ordinary black box overlaying the character after point;
-that is the default. The symbol @code{bar} specifies a vertical bar
-between characters as the cursor. @code{(bar . @var{width})} specifies
-a bar @var{width} pixels wide.
+How to display the cursor. Legitimate values are:
+
+@table @code
+@item box
+Display a filled box. (This is the default.)
+@item hollow
+Display a hollow box.
+@item nil
+Don't display a cursor.
+@item bar
+Display a vertical bar between characters.
+@item (bar . @var{width})
+Display a vertical bar @var{width} pixels wide between characters.
+@item hbar
+Display a horizontal bar.
+@item (bar . @var{width})
+Display a horizontal bar @var{width} pixels high.
+@end table
@vindex cursor-type
The buffer-local variable @code{cursor-type} overrides the value of
@item screen-gamma
@cindex gamma correction
-If this is a number, Emacs performs ``gamma correction'' on colors. The
-value should be the screen gamma of your display, a floating point
-number. Usual PC monitors have a screen gamma of 2.2, so the default is
-to display for that gamma value. Specifying a smaller value results in
-darker colors, which is desirable for a monitor that tends to display
-colors too light. A screen gamma value of 1.5 may give good results for
-LCD color displays.
+If this is a number, Emacs performs ``gamma correction'' which adjusts
+the brightness of all colors. The value should be the screen gamma of
+your display, a floating point number.
+
+Usual PC monitors have a screen gamma of 2.2, so color values in
+Emacs, and in X windows generally, are calibrated to display properly
+on a monitor with that gamma value. If you specify 2.2 for
+@code{screen-gamma}, that means no correction is needed. Other values
+request correction, designed to make the corrected colors appear on
+your screen they way they would have appeared without correction on an
+ordinary monitor with a gamma value of 2.2.
+
+If your monitor displays colors too light, you should specify a
+@code{screen-gamma} value smaller than 2.2. This requests correction
+that makes colors darker. A screen gamma value of 1.5 may give good
+results for LCD color displays.
@item tool-bar-lines
The number of lines to use for the toolbar. A value of @code{nil} means
@end ignore
@end table
+@defvar blink-cursor-alist
+This variable specifies how to blink the cursor. Each element has the
+form @code{(@var{on-state} . @var{off-state})}. Whenever the cursor
+type equals @var{on-state} (comparing using @code{equal}), Emacs uses
+@var{off-state} to specify what the cursor looks like when it blinks
+``off''. Both @var{on-state} and @var{off-state} should be suitable
+values for the @code{cursor-type} frame parameter.
+
+There are various defaults for how to blink each type of cursor,
+if the type is not mentioned as an @var{on-state} here. Changes
+in this variable do not take effect immediately, because the variable
+is examined only when you specify a cursor type for a frame.
+@end defvar
+
@node Size and Position
@subsection Frame Size And Position
@cindex size of frame
@defvar selection-coding-system
This variable specifies the coding system to use when reading and
writing selections, the clipboard, or a cut buffer. @xref{Coding
-Systems}. The default is @code{compound-text}, which converts to
-the text representation that X11 normally uses.
+Systems}. The default is @code{compound-text-with-extensions}, which
+converts to the text representation that X11 normally uses.
@end defvar
@cindex clipboard support (for MS-Windows)
selected frame's terminal; @pxref{Input Focus}). At present, though,
the @var{display} argument has no effect.
-@defun tty-display-color-cells &optional display
-This function returns the number of distinct colors supported for
-@var{display}.
-@end defun
-
@defun tty-color-define name number &optional rgb display
@tindex tty-color-define
This function associates the color name @var{name} with
variable to some other string, around a call to @code{x-get-resource}.
@end defvar
- @xref{Resources X,, X Resources, emacs, The GNU Emacs Manual}.
+ @xref{X Resources,, X Resources, emacs, The GNU Emacs Manual}.
@node Display Feature Testing
@section Display Feature Testing
The functions in this section describe the basic capabilities of a
particular display. Lisp programs can use them to adapt their behavior
-to what the display can do. For example, a program that ordinarly uses
+to what the display can do. For example, a program that ordinarily uses
a popup menu could use the minibuffer if popup menus are not supported.
The optional argument @var{display} in these functions specifies which
(All color displays can do this.)
@end defun
+@anchor{Display Face Attribute Testing}
+@defun display-supports-face-attributes-p attributes &optional display
+@tindex display-supports-face-attributes-p
+This function returns non-@code{nil} if all the face attributes in
+@var{attributes} are supported (@pxref{Face Attributes}).
+
+The definition of `supported' is somewhat heuristic, but basically
+means that a face containing all the attributes in @var{attributes},
+when merged with the default face for display, can be represented in a
+way that's
+
+@enumerate
+@item
+different in appearance than the default face, and
+
+@item
+`close in spirit' to what the attributes specify, if not exact.
+@end enumerate
+
+Point (2) implies that a @code{:weight black} attribute will be
+satisfied by any display that can display bold, as will
+@code{:foreground "yellow"} as long as some yellowish color can be
+displayed, but @code{:slant italic} will @emph{not} be satisfied by
+the tty display code's automatic substitution of a `dim' face for
+italic.
+@end defun
+
@defun display-selections-p &optional display
@tindex display-selections-p
This function returns @code{t} if @var{display} supports selections.