-\f
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;; Background mode.
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(defcustom frame-background-mode nil
- "The brightness of the background.
-Set this to the symbol `dark' if your background color is dark,
-`light' if your background is light, or nil (automatic by default)
-if you want Emacs to examine the brightness for you. Don't set this
-variable with `setq'; this won't have the expected effect."
- :group 'faces
- :set #'(lambda (var value)
- (set-default var value)
- (mapc 'frame-set-background-mode (frame-list)))
- :initialize 'custom-initialize-changed
- :type '(choice (const dark)
- (const light)
- (const :tag "automatic" nil)))
-
-
-(declare-function x-get-resource "frame.c"
- (attribute class &optional component subclass))
-
-(defvar inhibit-frame-set-background-mode nil)
-
-(defun frame-set-background-mode (frame &optional keep-face-specs)
- "Set up display-dependent faces on FRAME.
-Display-dependent faces are those which have different definitions
-according to the `background-mode' and `display-type' frame parameters.
-
-If optional arg KEEP-FACE-SPECS is non-nil, don't recalculate
-face specs for the new background mode."
- (unless inhibit-frame-set-background-mode
- (let* ((bg-resource
- (and (window-system frame)
- (x-get-resource "backgroundMode" "BackgroundMode")))
- (bg-color (frame-parameter frame 'background-color))
- (terminal-bg-mode (terminal-parameter frame 'background-mode))
- (tty-type (tty-type frame))
- (default-bg-mode
- (if (or (window-system frame)
- (and tty-type
- (string-match "^\\(xterm\\|\\rxvt\\|dtterm\\|eterm\\)"
- tty-type)))
- 'light
- 'dark))
- (non-default-bg-mode (if (eq default-bg-mode 'light) 'dark 'light))
- (bg-mode
- (cond (frame-background-mode)
- (bg-resource (intern (downcase bg-resource)))
- (terminal-bg-mode)
- ((equal bg-color "unspecified-fg") ; inverted colors
- non-default-bg-mode)
- ((not (color-values bg-color frame))
- default-bg-mode)
- ((>= (apply '+ (color-values bg-color frame))
- ;; Just looking at the screen, colors whose
- ;; values add up to .6 of the white total
- ;; still look dark to me.
- (* (apply '+ (color-values "white" frame)) .6))
- 'light)
- (t 'dark)))
- (display-type
- (cond ((null (window-system frame))
- (if (tty-display-color-p frame) 'color 'mono))
- ((display-color-p frame)
- 'color)
- ((x-display-grayscale-p frame)
- 'grayscale)
- (t 'mono)))
- (old-bg-mode
- (frame-parameter frame 'background-mode))
- (old-display-type
- (frame-parameter frame 'display-type)))
-
- (unless (and (eq bg-mode old-bg-mode) (eq display-type old-display-type))
- (let ((locally-modified-faces nil)
- ;; Prevent face-spec-recalc from calling this function
- ;; again, resulting in a loop (bug#911).
- (inhibit-frame-set-background-mode t)
- (params (list (cons 'background-mode bg-mode)
- (cons 'display-type display-type))))
- (if keep-face-specs
- (modify-frame-parameters frame params)
- ;; If we are recomputing face specs, first collect a list
- ;; of faces that don't match their face-specs. These are
- ;; the faces modified on FRAME, and we avoid changing them
- ;; below. Use a negative list to avoid consing (we assume
- ;; most faces are unmodified).
- (dolist (face (face-list))
- (and (not (get face 'face-override-spec))
- (not (face-spec-match-p face
- (face-user-default-spec face)
- (selected-frame)))
- (push face locally-modified-faces)))
- ;; Now change to the new frame parameters
- (modify-frame-parameters frame params)
- ;; For all unmodified named faces, choose face specs
- ;; matching the new frame parameters.
- (dolist (face (face-list))
- (unless (memq face locally-modified-faces)
- (face-spec-recalc face frame)))))))))