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Re: face at point


From: Miles Bader
Subject: Re: face at point
Date: 20 Nov 2002 16:34:55 +0900

Eli Zaretskii <address@hidden> writes:
> > All I really wanted to know was "Which is the best/most
> > appropriate/accepted way of distinguishing between emacs running on a
> > tty, in its own X frame and within an X term so that I can set my
> > colours accordingly. 
> 
> As I wrote earlier display-graphic-p and display-color-cells will let you 
> do that.

BTW, in the CVS version of emacs, I've written a new querying function
that's supposed to let you do more `result oriented queries' (though
whether it's actually enough, I'm not sure), somewhat clumsily called
`display-supports-face-attributes-p'.  Here's the help for it:

   display-supports-face-attributes-p is a compiled Lisp function in `faces'.
   (display-supports-face-attributes-p ATTRIBUTES &optional DISPLAY)

   Return non-nil if all the face attributes in ATTRIBUTES are supported.
   The optional argument DISPLAY can be a display name, a frame, or
   nil (meaning the selected frame's display)

   The definition of `supported' is somewhat heuristic, but basically means
   that a face containing all the attributes in ATTRIBUTES, when merged
   with the default face for display, can be represented in a way that's

    (1) different in appearance than the default face, and
    (2) `close in spirit' to what the attributes specify, if not exact.

   Point (2) implies that a `:weight black' attribute will be satisified by
   any display that can display bold, and a `:foreground "yellow"' as long
   as it can display a yellowish color, but `:slant italic' will _not_ be
   satisified by the tty display code's automatic substitution of a `dim'
   face for italic.display-supports-face-attributes-p is a compiled Lisp 
function in `faces'.
   (display-supports-face-attributes-p ATTRIBUTES &optional DISPLAY)

   Return non-nil if all the face attributes in ATTRIBUTES are supported.
   The optional argument DISPLAY can be a display name, a frame, or
   nil (meaning the selected frame's display)

   The definition of `supported' is somewhat heuristic, but basically means
   that a face containing all the attributes in ATTRIBUTES, when merged
   with the default face for display, can be represented in a way that's

    (1) different in appearance than the default face, and
    (2) `close in spirit' to what the attributes specify, if not exact.

   Point (2) implies that a `:weight black' attribute will be satisified by
   any display that can display bold, and a `:foreground "yellow"' as long
   as it can display a yellowish color, but `:slant italic' will _not_ be
   satisified by the tty display code's automatic substitution of a `dim'
   face for italic.

-Miles
-- 
Would you like fries with that?




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