lisp/faces.el

   1 ;;; faces.el --- Lisp interface to the c "face" structure
   2
   3 ;; Copyright (C) 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 2, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  19 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 ;; Boston, MA 02111-1307, USA.
  21
  22 ;;; Commentary:
  23
  24 ;; Mostly derived from Lucid.
  25
  26 ;;; Code:
  27
  28 (eval-when-compile
  29  ;; These used to be defsubsts, now they're subrs.  Avoid losing if we're
  30  ;; being compiled with an old Emacs that still has defsubrs in it.
  31  (put 'face-name 'byte-optimizer nil)
  32  (put 'face-id 'byte-optimizer nil)
  33  (put 'face-font 'byte-optimizer nil)
  34  (put 'face-foreground 'byte-optimizer nil)
  35  (put 'face-background 'byte-optimizer nil)
  36  (put 'face-stipple 'byte-optimizer nil)
  37  (put 'face-underline-p 'byte-optimizer nil)
  38  (put 'set-face-font 'byte-optimizer nil)
  39  (put 'set-face-foreground 'byte-optimizer nil)
  40  (put 'set-face-background 'byte-optimizer nil)
  41  (put 'set-face-stipple 'byte-optimizer nil)
  42  (put 'set-face-underline-p 'byte-optimizer nil))
  43 \f
  44 ;;;; Functions for manipulating face vectors.
  45
  46 ;;; A face vector is a vector of the form:
  47 ;;;    [face NAME ID FONT FOREGROUND BACKGROUND STIPPLE UNDERLINE]
  48
  49 ;;; Type checkers.
  50 (defsubst internal-facep (x)
  51   (and (vectorp x) (= (length x) 8) (eq (aref x 0) 'face)))
  52
  53 (defun facep (x)
  54   "Return t if X is a face name or an internal face vector."
  55   (and (or (internal-facep x)
  56            (and (symbolp x) (assq x global-face-data)))
  57        t))
  58
  59 (defmacro internal-check-face (face)
  60   (` (or (internal-facep (, face))
  61          (signal 'wrong-type-argument (list 'internal-facep (, face))))))
  62
  63 ;;; Accessors.
  64 (defun face-name (face)
  65   "Return the name of face FACE."
  66   (aref (internal-get-face face) 1))
  67
  68 (defun face-id (face)
  69   "Return the internal ID number of face FACE."
  70   (aref (internal-get-face face) 2))
  71
  72 (defun face-font (face &optional frame)
  73   "Return the font name of face FACE, or nil if it is unspecified.
  74 If the optional argument FRAME is given, report on face FACE in that frame.
  75 If FRAME is t, report on the defaults for face FACE (for new frames).
  76   The font default for a face is either nil, or a list
  77   of the form (bold), (italic) or (bold italic).
  78 If FRAME is omitted or nil, use the selected frame."
  79   (aref (internal-get-face face frame) 3))
  80
  81 (defun face-foreground (face &optional frame)
  82   "Return the foreground color name of face FACE, or nil if unspecified.
  83 If the optional argument FRAME is given, report on face FACE in that frame.
  84 If FRAME is t, report on the defaults for face FACE (for new frames).
  85 If FRAME is omitted or nil, use the selected frame."
  86   (aref (internal-get-face face frame) 4))
  87
  88 (defun face-background (face &optional frame)
  89   "Return the background color name of face FACE, or nil if unspecified.
  90 If the optional argument FRAME is given, report on face FACE in that frame.
  91 If FRAME is t, report on the defaults for face FACE (for new frames).
  92 If FRAME is omitted or nil, use the selected frame."
  93   (aref (internal-get-face face frame) 5))
  94
  95 (defun face-stipple (face &optional frame)
  96  "Return the stipple pixmap name of face FACE, or nil if unspecified.
  97 If the optional argument FRAME is given, report on face FACE in that frame.
  98 If FRAME is t, report on the defaults for face FACE (for new frames).
  99 If FRAME is omitted or nil, use the selected frame."
 100  (aref (internal-get-face face frame) 6))
 101
 102 (defalias 'face-background-pixmap 'face-stipple)
 103
 104 (defun face-underline-p (face &optional frame)
 105  "Return t if face FACE is underlined.
 106 If the optional argument FRAME is given, report on face FACE in that frame.
 107 If FRAME is t, report on the defaults for face FACE (for new frames).
 108 If FRAME is omitted or nil, use the selected frame."
 109  (aref (internal-get-face face frame) 7))
 110
 111 \f
 112 ;;; Mutators.
 113
 114 (defun set-face-font (face font &optional frame)
 115   "Change the font of face FACE to FONT (a string).
 116 If the optional FRAME argument is provided, change only
 117 in that frame; otherwise change each frame."
 118   (interactive (internal-face-interactive "font"))
 119   (if (stringp font) (setq font (x-resolve-font-name font 'default frame)))
 120   (internal-set-face-1 face 'font font 3 frame))
 121
 122 (defun set-face-foreground (face color &optional frame)
 123   "Change the foreground color of face FACE to COLOR (a string).
 124 If the optional FRAME argument is provided, change only
 125 in that frame; otherwise change each frame."
 126   (interactive (internal-face-interactive "foreground"))
 127   (internal-set-face-1 face 'foreground color 4 frame))
 128
 129 (defvar face-default-stipple "gray3"
 130   "Default stipple pattern used on monochrome displays.
 131 This stipple pattern is used on monochrome displays
 132 instead of shades of gray for a face background color.
 133 See `set-face-stipple' for possible values for this variable.")
 134
 135 (defun face-color-gray-p (color &optional frame)
 136   "Return t if COLOR is a shade of gray (or white or black).
 137 FRAME specifies the frame and thus the display for interpreting COLOR."
 138   (let* ((values (x-color-values color frame))
 139          (r (nth 0 values))
 140          (g (nth 1 values))
 141          (b (nth 2 values)))
 142     (and values
 143          (< (abs (- r g)) (/ (max 1 (abs r) (abs g)) 20))
 144          (< (abs (- g b)) (/ (max 1 (abs g) (abs b)) 20))
 145          (< (abs (- b r)) (/ (max 1 (abs b) (abs r)) 20)))))
 146
 147 (defun set-face-background (face color &optional frame)
 148   "Change the background color of face FACE to COLOR (a string).
 149 If the optional FRAME argument is provided, change only
 150 in that frame; otherwise change each frame."
 151   (interactive (internal-face-interactive "background"))
 152   ;; For a specific frame, use gray stipple instead of gray color
 153   ;; if the display does not support a gray color.
 154   (if (and frame (not (eq frame t)) color
 155            ;; Check for support for foreground, not for background!
 156            ;; face-color-supported-p is smart enough to know
 157            ;; that grays are "supported" as background
 158            ;; because we are supposed to use stipple for them!
 159            (not (face-color-supported-p frame color nil)))
 160       (set-face-stipple face face-default-stipple frame)
 161     (if (null frame)
 162         (let ((frames (frame-list)))
 163           (while frames
 164             (set-face-background (face-name face) color (car frames))
 165             (setq frames (cdr frames)))
 166           (set-face-background face color t)
 167           color)
 168       (internal-set-face-1 face 'background color 5 frame))))
 169
 170 (defun set-face-stipple (face pixmap &optional frame)
 171   "Change the stipple pixmap of face FACE to PIXMAP.
 172 PIXMAP should be a string, the name of a file of pixmap data.
 173 The directories listed in the `x-bitmap-file-path' variable are searched.
 174
 175 Alternatively, PIXMAP may be a list of the form (WIDTH HEIGHT DATA)
 176 where WIDTH and HEIGHT are the size in pixels,
 177 and DATA is a string, containing the raw bits of the bitmap.
 178
 179 If the optional FRAME argument is provided, change only
 180 in that frame; otherwise change each frame."
 181   (interactive (internal-face-interactive-stipple "stipple"))
 182   (internal-set-face-1 face 'background-pixmap pixmap 6 frame))
 183
 184 (defalias 'set-face-background-pixmap 'set-face-stipple)
 185
 186 (defun set-face-underline-p (face underline-p &optional frame)
 187   "Specify whether face FACE is underlined.  (Yes if UNDERLINE-P is non-nil.)
 188 If the optional FRAME argument is provided, change only
 189 in that frame; otherwise change each frame."
 190   (interactive (internal-face-interactive "underline-p" "underlined"))
 191   (internal-set-face-1 face 'underline underline-p 7 frame))
 192 \f
 193 (defun modify-face-read-string (face default name alist)
 194   (let ((value
 195          (completing-read
 196           (if default
 197               (format "Set face %s %s (default %s): "
 198                       face name (downcase default))
 199             (format "Set face %s %s: " face name))
 200           alist)))
 201     (cond ((equal value "none")
 202            nil)
 203           ((equal value "")
 204            default)
 205           (t value))))
 206
 207 (defun modify-face (face foreground background stipple
 208                     bold-p italic-p underline-p &optional frame)
 209   "Change the display attributes for face FACE.
 210 If the optional FRAME argument is provided, change only
 211 in that frame; otherwise change each frame.
 212
 213 FOREGROUND and BACKGROUND should be a colour name string (or list of strings to
 214 try) or nil.  STIPPLE should be a stipple pattern name string or nil.
 215 If nil, means do not change the display attribute corresponding to that arg.
 216
 217 BOLD-P, ITALIC-P, and UNDERLINE-P specify whether the face should be set bold,
 218 in italic, and underlined, respectively.  If neither nil or t, means do not
 219 change the display attribute corresponding to that arg.
 220
 221 If called interactively, prompts for a face name and face attributes."
 222   (interactive
 223    (let* ((completion-ignore-case t)
 224           (face         (symbol-name (read-face-name "Modify face: ")))
 225           (colors       (mapcar 'list x-colors))
 226           (stipples     (mapcar 'list (apply 'nconc
 227                                             (mapcar 'directory-files
 228                                                     x-bitmap-file-path))))
 229           (foreground   (modify-face-read-string
 230                          face (face-foreground (intern face))
 231                          "foreground" colors))
 232           (background   (modify-face-read-string
 233                          face (face-background (intern face))
 234                          "background" colors))
 235           ;; If the stipple value is a list (WIDTH HEIGHT DATA),
 236           ;; represent that as a string by printing it out.
 237           (old-stipple-string
 238            (if (stringp (face-stipple (intern face)))
 239                (face-stipple (intern face))
 240              (if (face-stipple (intern face))
 241                  (prin1-to-string (face-stipple (intern face))))))
 242           (new-stipple-string
 243            (modify-face-read-string
 244             face old-stipple-string
 245             "stipple" stipples))
 246           ;; Convert the stipple value text we read
 247           ;; back to a list if it looks like one.
 248           ;; This makes the assumption that a pixmap file name
 249           ;; won't start with an open-paren.
 250           (stipple
 251            (and new-stipple-string
 252                 (if (string-match "^(" new-stipple-string)
 253                     (read new-stipple-string)
 254                   new-stipple-string)))
 255           (bold-p       (y-or-n-p (concat "Should face " face " be bold ")))
 256           (italic-p     (y-or-n-p (concat "Should face " face " be italic ")))
 257           (underline-p  (y-or-n-p (concat "Should face " face " be underlined ")))
 258           (all-frames-p (y-or-n-p (concat "Modify face " face " in all frames "))))
 259      (message "Face %s: %s" face
 260       (mapconcat 'identity
 261        (delq nil
 262         (list (and foreground (concat (downcase foreground) " foreground"))
 263               (and background (concat (downcase background) " background"))
 264               (and stipple (concat (downcase new-stipple-string) " stipple"))
 265               (and bold-p "bold") (and italic-p "italic")
 266               (and underline-p "underline"))) ", "))
 267      (list (intern face) foreground background stipple
 268            bold-p italic-p underline-p
 269            (if all-frames-p nil (selected-frame)))))
 270   (condition-case nil
 271       (face-try-color-list 'set-face-foreground face foreground frame)
 272     (error nil))
 273   (condition-case nil
 274       (face-try-color-list 'set-face-background face background frame)
 275     (error nil))
 276   (condition-case nil
 277       (set-face-stipple face stipple frame)
 278     (error nil))
 279   (cond ((eq bold-p nil) (make-face-unbold face frame t))
 280         ((eq bold-p t) (make-face-bold face frame t)))
 281   (cond ((eq italic-p nil) (make-face-unitalic face frame t))
 282         ((eq italic-p t) (make-face-italic face frame t)))
 283   (if (memq underline-p '(nil t))
 284       (set-face-underline-p face underline-p frame))
 285   (and (interactive-p) (redraw-display)))
 286 \f
 287 ;;;; Associating face names (symbols) with their face vectors.
 288
 289 (defvar global-face-data nil
 290   "Internal data for face support functions.  Not for external use.
 291 This is an alist associating face names with the default values for
 292 their parameters.  Newly created frames get their data from here.")
 293
 294 (defun face-list ()
 295   "Returns a list of all defined face names."
 296   (mapcar 'car global-face-data))
 297
 298 (defun internal-find-face (name &optional frame)
 299   "Retrieve the face named NAME.  Return nil if there is no such face.
 300 If the optional argument FRAME is given, this gets the face NAME for
 301 that frame; otherwise, it uses the selected frame.
 302 If FRAME is the symbol t, then the global, non-frame face is returned.
 303 If NAME is already a face, it is simply returned."
 304   (if (and (eq frame t) (not (symbolp name)))
 305       (setq name (face-name name)))
 306   (if (symbolp name)
 307       (cdr (assq name
 308                  (if (eq frame t)
 309                      global-face-data
 310                    (frame-face-alist (or frame (selected-frame))))))
 311     (internal-check-face name)
 312     name))
 313
 314 (defun internal-get-face (name &optional frame)
 315   "Retrieve the face named NAME; error if there is none.
 316 If the optional argument FRAME is given, this gets the face NAME for
 317 that frame; otherwise, it uses the selected frame.
 318 If FRAME is the symbol t, then the global, non-frame face is returned.
 319 If NAME is already a face, it is simply returned."
 320   (or (internal-find-face name frame)
 321       (internal-check-face name)))
 322
 323
 324 (defun internal-set-face-1 (face name value index frame)
 325   (let ((inhibit-quit t))
 326     (if (null frame)
 327         (let ((frames (frame-list)))
 328           (while frames
 329             (internal-set-face-1 (face-name face) name value index (car frames))
 330             (setq frames (cdr frames)))
 331           (aset (internal-get-face (if (symbolp face) face (face-name face)) t)
 332                 index value)
 333           value)
 334       (or (eq frame t)
 335           (set-face-attribute-internal (face-id face) name value frame))
 336       (aset (internal-get-face face frame) index value))))
 337
 338
 339 (defun read-face-name (prompt)
 340   (let (face)
 341     (while (= (length face) 0)
 342       (setq face (completing-read prompt
 343                                   (mapcar '(lambda (x) (list (symbol-name x)))
 344                                           (face-list))
 345                                   nil t)))
 346     (intern face)))
 347
 348 (defun internal-face-interactive (what &optional bool)
 349   (let* ((fn (intern (concat "face-" what)))
 350          (prompt (concat "Set " what " of face"))
 351          (face (read-face-name (concat prompt ": ")))
 352          (default (if (fboundp fn)
 353                       (or (funcall fn face (selected-frame))
 354                           (funcall fn 'default (selected-frame)))))
 355          (value (if bool
 356                     (y-or-n-p (concat "Should face " (symbol-name face)
 357                                       " be " bool "? "))
 358                   (read-string (concat prompt " " (symbol-name face) " to: ")
 359                                default))))
 360     (list face (if (equal value "") nil value))))
 361
 362 (defun internal-face-interactive-stipple (what)
 363   (let* ((fn (intern (concat "face-" what)))
 364          (prompt (concat "Set " what " of face"))
 365          (face (read-face-name (concat prompt ": ")))
 366          (default (if (fboundp fn)
 367                       (or (funcall fn face (selected-frame))
 368                           (funcall fn 'default (selected-frame)))))
 369          ;; If the stipple value is a list (WIDTH HEIGHT DATA),
 370          ;; represent that as a string by printing it out.
 371          (old-stipple-string
 372           (if (stringp (face-stipple face))
 373               (face-stipple face)
 374             (if (null (face-stipple face))
 375                 nil
 376               (prin1-to-string (face-stipple face)))))
 377          (new-stipple-string
 378           (read-string
 379            (concat prompt " " (symbol-name face) " to: ")
 380            old-stipple-string))
 381          ;; Convert the stipple value text we read
 382          ;; back to a list if it looks like one.
 383          ;; This makes the assumption that a pixmap file name
 384          ;; won't start with an open-paren.
 385          (stipple
 386           (if (string-match "^(" new-stipple-string)
 387               (read new-stipple-string)
 388             new-stipple-string)))
 389     (list face (if (equal stipple "") nil stipple))))
 390
 391 (defun make-face (name)
 392   "Define a new FACE on all frames.
 393 You can modify the font, color, etc of this face with the set-face- functions.
 394 If the face already exists, it is unmodified."
 395   (interactive "SMake face: ")
 396   (or (internal-find-face name)
 397       (let ((face (make-vector 8 nil)))
 398         (aset face 0 'face)
 399         (aset face 1 name)
 400         (let* ((frames (frame-list))
 401                (inhibit-quit t)
 402                (id (internal-next-face-id)))
 403           (make-face-internal id)
 404           (aset face 2 id)
 405           (while frames
 406             (set-frame-face-alist (car frames)
 407                                   (cons (cons name (copy-sequence face))
 408                                         (frame-face-alist (car frames))))
 409             (setq frames (cdr frames)))
 410           (setq global-face-data (cons (cons name face) global-face-data)))
 411         ;; when making a face after frames already exist
 412         (if (or (eq window-system 'x) (eq window-system 'win32))
 413             (make-face-x-resource-internal face))
 414         ;; add to menu
 415         (if (fboundp 'facemenu-add-new-face)
 416             (facemenu-add-new-face name))
 417         face))
 418   name)
 419
 420 ;; Fill in a face by default based on X resources, for all existing frames.
 421 ;; This has to be done when a new face is made.
 422 (defun make-face-x-resource-internal (face &optional frame set-anyway)
 423   (cond ((null frame)
 424          (let ((frames (frame-list)))
 425            (while frames
 426              (if (or (eq (framep (car frames)) 'x) (eq (framep (car frames)) 'win32))
 427                  (make-face-x-resource-internal (face-name face)
 428                                                 (car frames) set-anyway))
 429              (setq frames (cdr frames)))))
 430         (t
 431          (setq face (internal-get-face (face-name face) frame))
 432          ;;
 433          ;; These are things like "attributeForeground" instead of simply
 434          ;; "foreground" because people tend to do things like "*foreground",
 435          ;; which would cause all faces to be fully qualified, making faces
 436          ;; inherit attributes in a non-useful way.  So we've made them slightly
 437          ;; less obvious to specify in order to make them work correctly in
 438          ;; more random environments.
 439          ;;
 440          ;; I think these should be called "face.faceForeground" instead of
 441          ;; "face.attributeForeground", but they're the way they are for
 442          ;; hysterical reasons.
 443          ;;
 444          (let* ((name (symbol-name (face-name face)))
 445                 (fn  (or (x-get-resource (concat name ".attributeFont")
 446                                          "Face.AttributeFont")
 447                          (and set-anyway (face-font face))))
 448                 (fg  (or (x-get-resource (concat name ".attributeForeground")
 449                                          "Face.AttributeForeground")
 450                          (and set-anyway (face-foreground face))))
 451                 (bg  (or (x-get-resource (concat name ".attributeBackground")
 452                                          "Face.AttributeBackground")
 453                          (and set-anyway (face-background face))))
 454                 (bgp (or (x-get-resource (concat name ".attributeStipple")
 455                                          "Face.AttributeStipple")
 456                          (x-get-resource (concat name ".attributeBackgroundPixmap")
 457                                          "Face.AttributeBackgroundPixmap")
 458                          (and set-anyway (face-stipple face))))
 459                 (ulp (let ((resource (x-get-resource
 460                                       (concat name ".attributeUnderline")
 461                                       "Face.AttributeUnderline")))
 462                        (if resource
 463                            (member (downcase resource) '("on" "true"))
 464                          (and set-anyway (face-underline-p face)))))
 465                 )
 466            (if fn
 467                (condition-case ()
 468                    (cond ((string= fn "italic")
 469                           (make-face-italic face))
 470                          ((string= fn "bold")
 471                           (make-face-bold face))
 472                          ((string= fn "bold-italic")
 473                           (make-face-bold-italic face))
 474                          (t
 475                           (set-face-font face fn frame)))
 476                  (error
 477                   (if (member fn '("italic" "bold" "bold-italic"))
 478                       (message "no %s version found for face `%s'" fn name)
 479                     (message "font `%s' not found for face `%s'" fn name)))))
 480            (if fg
 481                (condition-case ()
 482                    (set-face-foreground face fg frame)
 483                  (error (message "color `%s' not allocated for face `%s'" fg name))))
 484            (if bg
 485                (condition-case ()
 486                    (set-face-background face bg frame)
 487                  (error (message "color `%s' not allocated for face `%s'" bg name))))
 488            (if bgp
 489                (condition-case ()
 490                    (set-face-stipple face bgp frame)
 491                  (error (message "pixmap `%s' not found for face `%s'" bgp name))))
 492            (if (or ulp set-anyway)
 493                (set-face-underline-p face ulp frame))
 494            )))
 495   face)
 496
 497 (defun copy-face (old-face new-face &optional frame new-frame)
 498   "Define a face just like OLD-FACE, with name NEW-FACE.
 499 If NEW-FACE already exists as a face, it is modified to be like OLD-FACE.
 500 If it doesn't already exist, it is created.
 501
 502 If the optional argument FRAME is given as a frame,
 503 NEW-FACE is changed on FRAME only.
 504 If FRAME is t, the frame-independent default specification for OLD-FACE
 505 is copied to NEW-FACE.
 506 If FRAME is nil, copying is done for the frame-independent defaults
 507 and for each existing frame.
 508 If the optional fourth argument NEW-FRAME is given,
 509 copy the information from face OLD-FACE on frame FRAME
 510 to NEW-FACE on frame NEW-FRAME."
 511   (or new-frame (setq new-frame frame))
 512   (let ((inhibit-quit t))
 513     (if (null frame)
 514         (let ((frames (frame-list)))
 515           (while frames
 516             (copy-face old-face new-face (car frames))
 517             (setq frames (cdr frames)))
 518           (copy-face old-face new-face t))
 519       (setq old-face (internal-get-face old-face frame))
 520       (setq new-face (or (internal-find-face new-face new-frame)
 521                          (make-face new-face)))
 522       (condition-case nil
 523           ;; A face that has a global symbolic font modifier such as `bold'
 524           ;; might legitimately get an error here.
 525           ;; Use the frame's default font in that case.
 526           (set-face-font new-face (face-font old-face frame) new-frame)
 527         (error
 528          (set-face-font new-face nil new-frame)))
 529       (set-face-foreground new-face (face-foreground old-face frame) new-frame)
 530       (set-face-background new-face (face-background old-face frame) new-frame)
 531       (set-face-stipple new-face
 532                         (face-stipple old-face frame)
 533                         new-frame)
 534       (set-face-underline-p new-face (face-underline-p old-face frame)
 535                             new-frame))
 536     new-face))
 537
 538 (defun face-equal (face1 face2 &optional frame)
 539   "True if the faces FACE1 and FACE2 display in the same way."
 540   (setq face1 (internal-get-face face1 frame)
 541         face2 (internal-get-face face2 frame))
 542   (and (equal (face-foreground face1 frame) (face-foreground face2 frame))
 543        (equal (face-background face1 frame) (face-background face2 frame))
 544        (equal (face-font face1 frame) (face-font face2 frame))
 545        (eq (face-underline-p face1 frame) (face-underline-p face2 frame))
 546        (equal (face-stipple face1 frame)
 547               (face-stipple face2 frame))))
 548
 549 (defun face-differs-from-default-p (face &optional frame)
 550   "True if face FACE displays differently from the default face, on FRAME.
 551 A face is considered to be ``the same'' as the default face if it is
 552 actually specified in the same way (equivalent fonts, etc) or if it is
 553 fully unspecified, and thus inherits the attributes of any face it
 554 is displayed on top of.
 555
 556 The optional argument FRAME specifies which frame to test;
 557 if FRAME is t, test the default for new frames.
 558 If FRAME is nil or omitted, test the selected frame."
 559   (let ((default (internal-get-face 'default frame)))
 560     (setq face (internal-get-face face frame))
 561     (not (and (or (equal (face-foreground default frame)
 562                          (face-foreground face frame))
 563                   (null (face-foreground face frame)))
 564               (or (equal (face-background default frame)
 565                          (face-background face frame))
 566                   (null (face-background face frame)))
 567               (or (equal (face-font default frame) (face-font face frame))
 568                   (null (face-font face frame)))
 569               (or (equal (face-stipple default frame)
 570                          (face-stipple face frame))
 571                   (null (face-stipple face frame)))
 572               (equal (face-underline-p default frame)
 573                      (face-underline-p face frame))
 574               ))))
 575
 576 (defun face-nontrivial-p (face &optional frame)
 577   "True if face FACE has some non-nil attribute.
 578 The optional argument FRAME specifies which frame to test;
 579 if FRAME is t, test the default for new frames.
 580 If FRAME is nil or omitted, test the selected frame."
 581   (setq face (internal-get-face face frame))
 582   (or (face-foreground face frame)
 583       (face-background face frame)
 584       (face-font face frame)
 585       (face-stipple face frame)
 586       (face-underline-p face frame)))
 587
 588
 589 (defun invert-face (face &optional frame)
 590   "Swap the foreground and background colors of face FACE.
 591 If the face doesn't specify both foreground and background, then
 592 set its foreground and background to the default background and foreground."
 593   (interactive (list (read-face-name "Invert face: ")))
 594   (setq face (internal-get-face face frame))
 595   (let ((fg (face-foreground face frame))
 596         (bg (face-background face frame)))
 597     (if (or fg bg)
 598         (progn
 599           (set-face-foreground face bg frame)
 600           (set-face-background face fg frame))
 601       (set-face-foreground face (or (face-background 'default frame)
 602                                     (cdr (assq 'background-color (frame-parameters frame))))
 603                            frame)
 604       (set-face-background face (or (face-foreground 'default frame)
 605                                     (cdr (assq 'foreground-color (frame-parameters frame))))
 606                            frame)))
 607   face)
 608
 609
 610 (defun internal-try-face-font (face font &optional frame)
 611   "Like set-face-font, but returns nil on failure instead of an error."
 612   (condition-case ()
 613       (set-face-font face font frame)
 614     (error nil)))
 615 \f
 616 ;; Manipulating font names.
 617
 618 (defconst x-font-regexp nil)
 619 (defconst x-font-regexp-head nil)
 620 (defconst x-font-regexp-weight nil)
 621 (defconst x-font-regexp-slant nil)
 622
 623 (defconst x-font-regexp-weight-subnum 1)
 624 (defconst x-font-regexp-slant-subnum 2)
 625 (defconst x-font-regexp-swidth-subnum 3)
 626 (defconst x-font-regexp-adstyle-subnum 4)
 627
 628 ;;; Regexps matching font names in "Host Portable Character Representation."
 629 ;;;
 630 (let ((-                "[-?]")
 631       (foundry          "[^-]+")
 632       (family           "[^-]+")
 633       (weight           "\\(bold\\|demibold\\|medium\\)")               ; 1
 634 ;     (weight\?         "\\(\\*\\|bold\\|demibold\\|medium\\|\\)")      ; 1
 635       (weight\?         "\\([^-]*\\)")                                  ; 1
 636       (slant            "\\([ior]\\)")                                  ; 2
 637 ;     (slant\?          "\\([ior?*]?\\)")                               ; 2
 638       (slant\?          "\\([^-]?\\)")                                  ; 2
 639 ;     (swidth           "\\(\\*\\|normal\\|semicondensed\\|\\)")        ; 3
 640       (swidth           "\\([^-]*\\)")                                  ; 3
 641 ;     (adstyle          "\\(\\*\\|sans\\|\\)")                          ; 4
 642       (adstyle          "\\([^-]*\\)")                                  ; 4
 643       (pixelsize        "[0-9]+")
 644       (pointsize        "[0-9][0-9]+")
 645       (resx             "[0-9][0-9]+")
 646       (resy             "[0-9][0-9]+")
 647       (spacing          "[cmp?*]")
 648       (avgwidth         "[0-9]+")
 649       (registry         "[^-]+")
 650       (encoding         "[^-]+")
 651       )
 652   (setq x-font-regexp
 653         (concat "\\`\\*?[-?*]"
 654                 foundry - family - weight\? - slant\? - swidth - adstyle -
 655                 pixelsize - pointsize - resx - resy - spacing - avgwidth -
 656                 registry - encoding "\\*?\\'"
 657                 ))
 658   (setq x-font-regexp-head
 659         (concat "\\`[-?*]" foundry - family - weight\? - slant\?
 660                 "\\([-*?]\\|\\'\\)"))
 661   (setq x-font-regexp-slant (concat - slant -))
 662   (setq x-font-regexp-weight (concat - weight -))
 663   nil)
 664
 665 (defun x-resolve-font-name (pattern &optional face frame)
 666   "Return a font name matching PATTERN.
 667 All wildcards in PATTERN become substantiated.
 668 If PATTERN is nil, return the name of the frame's base font, which never
 669 contains wildcards.
 670 Given optional arguments FACE and FRAME, return a font which is
 671 also the same size as FACE on FRAME, or fail."
 672   (or (symbolp face)
 673       (setq face (face-name face)))
 674   (and (eq frame t)
 675        (setq frame nil))
 676   (if pattern
 677       ;; Note that x-list-fonts has code to handle a face with nil as its font.
 678       (let ((fonts (x-list-fonts pattern face frame)))
 679         (or fonts
 680             (if face
 681                 (if (string-match "\\*" pattern)
 682                     (if (null (face-font face))
 683                         (error "No matching fonts are the same height as the frame default font")
 684                       (error "No matching fonts are the same height as face `%s'" face))
 685                   (if (null (face-font face))
 686                       (error "Height of font `%s' doesn't match the frame default font"
 687                              pattern)
 688                     (error "Height of font `%s' doesn't match face `%s'"
 689                            pattern face)))
 690               (error "No fonts match `%s'" pattern)))
 691         (car fonts))
 692     (cdr (assq 'font (frame-parameters (selected-frame))))))
 693
 694 (defun x-frob-font-weight (font which)
 695   (let ((case-fold-search t))
 696     (cond ((string-match x-font-regexp font)
 697            (concat (substring font 0
 698                               (match-beginning x-font-regexp-weight-subnum))
 699                    which
 700                    (substring font (match-end x-font-regexp-weight-subnum)
 701                               (match-beginning x-font-regexp-adstyle-subnum))
 702                    ;; Replace the ADD_STYLE_NAME field with *
 703                    ;; because the info in it may not be the same
 704                    ;; for related fonts.
 705                    "*"
 706                    (substring font (match-end x-font-regexp-adstyle-subnum))))
 707           ((string-match x-font-regexp-head font)
 708            (concat (substring font 0 (match-beginning 1)) which
 709                    (substring font (match-end 1))))
 710           ((string-match x-font-regexp-weight font)
 711            (concat (substring font 0 (match-beginning 1)) which
 712                    (substring font (match-end 1)))))))
 713
 714 (defun x-frob-font-slant (font which)
 715   (let ((case-fold-search t))
 716     (cond ((string-match x-font-regexp font)
 717            (concat (substring font 0
 718                               (match-beginning x-font-regexp-slant-subnum))
 719                    which
 720                    (substring font (match-end x-font-regexp-slant-subnum)
 721                               (match-beginning x-font-regexp-adstyle-subnum))
 722                    ;; Replace the ADD_STYLE_NAME field with *
 723                    ;; because the info in it may not be the same
 724                    ;; for related fonts.
 725                    "*"
 726                    (substring font (match-end x-font-regexp-adstyle-subnum))))
 727           ((string-match x-font-regexp-head font)
 728            (concat (substring font 0 (match-beginning 2)) which
 729                    (substring font (match-end 2))))
 730           ((string-match x-font-regexp-slant font)
 731            (concat (substring font 0 (match-beginning 1)) which
 732                    (substring font (match-end 1)))))))
 733
 734 (defun x-make-font-bold (font)
 735   "Given an X font specification, make a bold version of it.
 736 If that can't be done, return nil."
 737   (x-frob-font-weight font "bold"))
 738
 739 (defun x-make-font-demibold (font)
 740   "Given an X font specification, make a demibold version of it.
 741 If that can't be done, return nil."
 742   (x-frob-font-weight font "demibold"))
 743
 744 (defun x-make-font-unbold (font)
 745   "Given an X font specification, make a non-bold version of it.
 746 If that can't be done, return nil."
 747   (x-frob-font-weight font "medium"))
 748
 749 (defun x-make-font-italic (font)
 750   "Given an X font specification, make an italic version of it.
 751 If that can't be done, return nil."
 752   (x-frob-font-slant font "i"))
 753
 754 (defun x-make-font-oblique (font) ; you say tomayto...
 755   "Given an X font specification, make an oblique version of it.
 756 If that can't be done, return nil."
 757   (x-frob-font-slant font "o"))
 758
 759 (defun x-make-font-unitalic (font)
 760   "Given an X font specification, make a non-italic version of it.
 761 If that can't be done, return nil."
 762   (x-frob-font-slant font "r"))
 763 \f
 764 ;;; non-X-specific interface
 765
 766 (defun make-face-bold (face &optional frame noerror)
 767   "Make the font of the given face be bold, if possible.
 768 If NOERROR is non-nil, return nil on failure."
 769   (interactive (list (read-face-name "Make which face bold: ")))
 770   (if (and (eq frame t) (listp (face-font face t)))
 771       (set-face-font face (if (memq 'italic (face-font face t))
 772                               '(bold italic) '(bold))
 773                      t)
 774     (let (font)
 775       (if (null frame)
 776           (let ((frames (frame-list)))
 777             ;; Make this face bold in global-face-data.
 778             (make-face-bold face t noerror)
 779             ;; Make this face bold in each frame.
 780             (while frames
 781               (make-face-bold face (car frames) noerror)
 782               (setq frames (cdr frames))))
 783         (setq face (internal-get-face face frame))
 784         (setq font (or (face-font face frame)
 785                        (face-font face t)))
 786         (if (listp font)
 787             (setq font nil))
 788         (setq font (or font
 789                        (face-font 'default frame)
 790                        (cdr (assq 'font (frame-parameters frame)))))
 791         (or (and font (make-face-bold-internal face frame font))
 792             ;; We failed to find a bold version of the font.
 793             noerror
 794             (error "No bold version of %S" font))))))
 795
 796 (defun make-face-bold-internal (face frame font)
 797   (let (f2)
 798     (or (and (setq f2 (x-make-font-bold font))
 799              (internal-try-face-font face f2 frame))
 800         (and (setq f2 (x-make-font-demibold font))
 801              (internal-try-face-font face f2 frame)))))
 802
 803 (defun make-face-italic (face &optional frame noerror)
 804   "Make the font of the given face be italic, if possible.
 805 If NOERROR is non-nil, return nil on failure."
 806   (interactive (list (read-face-name "Make which face italic: ")))
 807   (if (and (eq frame t) (listp (face-font face t)))
 808       (set-face-font face (if (memq 'bold (face-font face t))
 809                               '(bold italic) '(italic))
 810                      t)
 811     (let (font)
 812       (if (null frame)
 813           (let ((frames (frame-list)))
 814             ;; Make this face italic in global-face-data.
 815             (make-face-italic face t noerror)
 816             ;; Make this face italic in each frame.
 817             (while frames
 818               (make-face-italic face (car frames) noerror)
 819               (setq frames (cdr frames))))
 820         (setq face (internal-get-face face frame))
 821         (setq font (or (face-font face frame)
 822                        (face-font face t)))
 823         (if (listp font)
 824             (setq font nil))
 825         (setq font (or font
 826                        (face-font 'default frame)
 827                        (cdr (assq 'font (frame-parameters frame)))))
 828         (or (and font (make-face-italic-internal face frame font))
 829             ;; We failed to find an italic version of the font.
 830             noerror
 831             (error "No italic version of %S" font))))))
 832
 833 (defun make-face-italic-internal (face frame font)
 834   (let (f2)
 835     (or (and (setq f2 (x-make-font-italic font))
 836              (internal-try-face-font face f2 frame))
 837         (and (setq f2 (x-make-font-oblique font))
 838              (internal-try-face-font face f2 frame)))))
 839
 840 (defun make-face-bold-italic (face &optional frame noerror)
 841   "Make the font of the given face be bold and italic, if possible.
 842 If NOERROR is non-nil, return nil on failure."
 843   (interactive (list (read-face-name "Make which face bold-italic: ")))
 844   (if (and (eq frame t) (listp (face-font face t)))
 845       (set-face-font face '(bold italic) t)
 846     (let (font)
 847       (if (null frame)
 848           (let ((frames (frame-list)))
 849             ;; Make this face bold-italic in global-face-data.
 850             (make-face-bold-italic face t noerror)
 851             ;; Make this face bold in each frame.
 852             (while frames
 853               (make-face-bold-italic face (car frames) noerror)
 854               (setq frames (cdr frames))))
 855         (setq face (internal-get-face face frame))
 856         (setq font (or (face-font face frame)
 857                        (face-font face t)))
 858         (if (listp font)
 859             (setq font nil))
 860         (setq font (or font
 861                        (face-font 'default frame)
 862                        (cdr (assq 'font (frame-parameters frame)))))
 863         (or (and font (make-face-bold-italic-internal face frame font))
 864             ;; We failed to find a bold italic version.
 865             noerror
 866             (error "No bold italic version of %S" font))))))
 867
 868 (defun make-face-bold-italic-internal (face frame font)
 869   (let (f2 f3)
 870     (or (and (setq f2 (x-make-font-italic font))
 871              (not (equal font f2))
 872              (setq f3 (x-make-font-bold f2))
 873              (not (equal f2 f3))
 874              (internal-try-face-font face f3 frame))
 875         (and (setq f2 (x-make-font-oblique font))
 876              (not (equal font f2))
 877              (setq f3 (x-make-font-bold f2))
 878              (not (equal f2 f3))
 879              (internal-try-face-font face f3 frame))
 880         (and (setq f2 (x-make-font-italic font))
 881              (not (equal font f2))
 882              (setq f3 (x-make-font-demibold f2))
 883              (not (equal f2 f3))
 884              (internal-try-face-font face f3 frame))
 885         (and (setq f2 (x-make-font-oblique font))
 886              (not (equal font f2))
 887              (setq f3 (x-make-font-demibold f2))
 888              (not (equal f2 f3))
 889              (internal-try-face-font face f3 frame)))))
 890
 891 (defun make-face-unbold (face &optional frame noerror)
 892   "Make the font of the given face be non-bold, if possible.
 893 If NOERROR is non-nil, return nil on failure."
 894   (interactive (list (read-face-name "Make which face non-bold: ")))
 895   (if (and (eq frame t) (listp (face-font face t)))
 896       (set-face-font face (if (memq 'italic (face-font face t))
 897                               '(italic) nil)
 898                      t)
 899     (let (font font1)
 900       (if (null frame)
 901           (let ((frames (frame-list)))
 902             ;; Make this face unbold in global-face-data.
 903             (make-face-unbold face t noerror)
 904             ;; Make this face unbold in each frame.
 905             (while frames
 906               (make-face-unbold face (car frames) noerror)
 907               (setq frames (cdr frames))))
 908         (setq face (internal-get-face face frame))
 909         (setq font1 (or (face-font face frame)
 910                         (face-font face t)))
 911         (if (listp font1)
 912             (setq font1 nil))
 913         (setq font1 (or font1
 914                         (face-font 'default frame)
 915                         (cdr (assq 'font (frame-parameters frame)))))
 916         (setq font (and font1 (x-make-font-unbold font1)))
 917         (or (if font (internal-try-face-font face font frame))
 918             noerror
 919             (error "No unbold version of %S" font1))))))
 920
 921 (defun make-face-unitalic (face &optional frame noerror)
 922   "Make the font of the given face be non-italic, if possible.
 923 If NOERROR is non-nil, return nil on failure."
 924   (interactive (list (read-face-name "Make which face non-italic: ")))
 925   (if (and (eq frame t) (listp (face-font face t)))
 926       (set-face-font face (if (memq 'bold (face-font face t))
 927                               '(bold) nil)
 928                      t)
 929     (let (font font1)
 930       (if (null frame)
 931           (let ((frames (frame-list)))
 932             ;; Make this face unitalic in global-face-data.
 933             (make-face-unitalic face t noerror)
 934             ;; Make this face unitalic in each frame.
 935             (while frames
 936               (make-face-unitalic face (car frames) noerror)
 937               (setq frames (cdr frames))))
 938         (setq face (internal-get-face face frame))
 939         (setq font1 (or (face-font face frame)
 940                         (face-font face t)))
 941         (if (listp font1)
 942             (setq font1 nil))
 943         (setq font1 (or font1
 944                         (face-font 'default frame)
 945                         (cdr (assq 'font (frame-parameters frame)))))
 946         (setq font (and font1 (x-make-font-unitalic font1)))
 947         (or (if font (internal-try-face-font face font frame))
 948             noerror
 949             (error "No unitalic version of %S" font1))))))
 950 \f
 951 (defvar list-faces-sample-text
 952   "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 953   "*Text string to display as the sample text for `list-faces-display'.")
 954
 955 ;; The name list-faces would be more consistent, but let's avoid a conflict
 956 ;; with Lucid, which uses that name differently.
 957 (defun list-faces-display ()
 958   "List all faces, using the same sample text in each.
 959 The sample text is a string that comes from the variable
 960 `list-faces-sample-text'.
 961
 962 It is possible to give a particular face name different appearances in
 963 different frames.  This command shows the appearance in the
 964 selected frame."
 965   (interactive)
 966   (let ((faces (sort (face-list) (function string-lessp)))
 967         (face nil)
 968         (frame (selected-frame))
 969         disp-frame window)
 970     (with-output-to-temp-buffer "*Faces*"
 971       (save-excursion
 972         (set-buffer standard-output)
 973         (setq truncate-lines t)
 974         (while faces
 975           (setq face (car faces))
 976           (setq faces (cdr faces))
 977           (insert (format "%25s " (symbol-name face)))
 978           (let ((beg (point)))
 979             (insert list-faces-sample-text)
 980             (insert "\n")
 981             (put-text-property beg (1- (point)) 'face face)
 982             ;; If the sample text has multiple lines, line up all of them.
 983             (goto-char beg)
 984             (forward-line 1)
 985             (while (not (eobp))
 986               (insert "                          ")
 987               (forward-line 1))))
 988         (goto-char (point-min))))
 989     ;; If the *Faces* buffer appears in a different frame,
 990     ;; copy all the face definitions from FRAME,
 991     ;; so that the display will reflect the frame that was selected.
 992     (setq window (get-buffer-window (get-buffer "*Faces*") t))
 993     (setq disp-frame (if window (window-frame window)
 994                        (car (frame-list))))
 995     (or (eq frame disp-frame)
 996         (let ((faces (face-list)))
 997           (while faces
 998             (copy-face (car faces) (car faces) frame disp-frame)
 999             (setq faces (cdr faces)))))))
1000
1001 (defun describe-face (face)
1002   "Display the properties of face FACE."
1003   (interactive (list (read-face-name "Describe face: ")))
1004   (with-output-to-temp-buffer "*Help*"
1005     (princ "Properties of face `")
1006     (princ (face-name face))
1007     (princ "':") (terpri)
1008     (princ "Foreground: ") (princ (face-foreground face)) (terpri)
1009     (princ "Background: ") (princ (face-background face)) (terpri)
1010     (princ "      Font: ") (princ (face-font face)) (terpri)
1011     (princ "Underlined: ") (princ (if (face-underline-p face) "yes" "no")) (terpri)
1012     (princ "   Stipple: ") (princ (or (face-stipple face) "none"))))
1013 \f
1014 ;;; Make the standard faces.
1015 ;;; The C code knows the default and modeline faces as faces 0 and 1,
1016 ;;; so they must be the first two faces made.
1017 (defun face-initialize ()
1018   (make-face 'default)
1019   (make-face 'modeline)
1020   (make-face 'highlight)
1021
1022   ;; These aren't really special in any way, but they're nice to have around.
1023
1024   (make-face 'bold)
1025   (make-face 'italic)
1026   (make-face 'bold-italic)
1027   (make-face 'region)
1028   (make-face 'secondary-selection)
1029   (make-face 'underline)
1030
1031   (setq region-face (face-id 'region))
1032
1033   ;; Specify the global properties of these faces
1034   ;; so they will come out right on new frames.
1035
1036   (make-face-bold 'bold t)
1037   (make-face-italic 'italic t)
1038   (make-face-bold-italic 'bold-italic t)
1039
1040   (set-face-background 'highlight '("darkseagreen2" "green" t) t)
1041   (set-face-background 'region '("gray" underline) t)
1042   (set-face-background 'secondary-selection '("paleturquoise" "green" t) t)
1043   (set-face-background 'modeline '(t) t)
1044   (set-face-underline-p 'underline t t)
1045
1046   ;; Set up the faces of all existing X Window frames
1047   ;; from those global properties, unless already set in a given frame.
1048
1049   (let ((frames (frame-list)))
1050     (while frames
1051       (if (not (memq (framep (car frames)) '(t nil)))
1052           (let ((frame (car frames))
1053                 (rest global-face-data))
1054             (while rest
1055               (let ((face (car (car rest))))
1056                 (or (face-differs-from-default-p face)
1057                     (face-fill-in face (cdr (car rest)) frame)))
1058               (setq rest (cdr rest)))))
1059       (setq frames (cdr frames)))))
1060
1061 \f
1062 ;; Like x-create-frame but also set up the faces.
1063
1064 (defun x-create-frame-with-faces (&optional parameters)
1065   ;; Read this frame's geometry resource, if it has an explicit name,
1066   ;; and put the specs into PARAMETERS.
1067   (let* ((name (or (cdr (assq 'name parameters))
1068                    (cdr (assq 'name default-frame-alist))))
1069          (x-resource-name name)
1070          (res-geometry (if name (x-get-resource "geometry" "Geometry")))
1071          parsed)
1072     (if res-geometry
1073         (progn
1074           (setq parsed (x-parse-geometry res-geometry))
1075           ;; If the resource specifies a position,
1076           ;; call the position and size "user-specified".
1077           (if (or (assq 'top parsed) (assq 'left parsed))
1078               (setq parsed (cons '(user-position . t)
1079                                  (cons '(user-size . t) parsed))))
1080           ;; Put the geometry parameters at the end.
1081           ;; Copy default-frame-alist so that they go after it.
1082           (setq parameters (append parameters
1083                                    default-frame-alist
1084                                    parsed)))))
1085   (let (frame)
1086     (if (null global-face-data)
1087         (setq frame (x-create-frame parameters))
1088       (let* ((visibility-spec (assq 'visibility parameters))
1089              (faces (copy-alist global-face-data))
1090              success
1091              (rest faces))
1092         (setq frame (x-create-frame (cons '(visibility . nil) parameters)))
1093         (unwind-protect
1094             (progn
1095               (set-frame-face-alist frame faces)
1096
1097               (if (cdr (or (assq 'reverse parameters)
1098                            (assq 'reverse default-frame-alist)
1099                            (let ((resource (x-get-resource "reverseVideo"
1100                                                            "ReverseVideo")))
1101                              (if resource
1102                                  (cons nil (member (downcase resource)
1103                                                    '("on" "true")))))))
1104                   (let* ((params (frame-parameters frame))
1105                          (bg (cdr (assq 'foreground-color params)))
1106                          (fg (cdr (assq 'background-color params))))
1107                     (modify-frame-parameters frame
1108                                              (list (cons 'foreground-color fg)
1109                                                    (cons 'background-color bg)))
1110                     (if (equal bg (cdr (assq 'border-color params)))
1111                         (modify-frame-parameters frame
1112                                                  (list (cons 'border-color fg))))
1113                     (if (equal bg (cdr (assq 'mouse-color params)))
1114                         (modify-frame-parameters frame
1115                                                  (list (cons 'mouse-color fg))))
1116                     (if (equal bg (cdr (assq 'cursor-color params)))
1117                         (modify-frame-parameters frame
1118                                                  (list (cons 'cursor-color fg))))))
1119               ;; Copy the vectors that represent the faces.
1120               ;; Also fill them in from X resources.
1121               (while rest
1122                 (let ((global (cdr (car rest))))
1123                   (setcdr (car rest) (vector 'face
1124                                              (face-name (cdr (car rest)))
1125                                              (face-id (cdr (car rest)))
1126                                              nil nil nil nil nil))
1127                   (face-fill-in (car (car rest)) global frame))
1128                 (make-face-x-resource-internal (cdr (car rest)) frame t)
1129                 (setq rest (cdr rest)))
1130               (if (null visibility-spec)
1131                   (make-frame-visible frame)
1132                 (modify-frame-parameters frame (list visibility-spec)))
1133               (setq success t))
1134           (or success
1135               (delete-frame frame)))))
1136     ;; Set up the background-mode frame parameter
1137     ;; so that programs can decide good ways of highlighting
1138     ;; on this frame.
1139     (let ((bg-resource (x-get-resource ".backgroundMode"
1140                                        "BackgroundMode"))
1141           (params (frame-parameters frame))
1142           (bg-mode))
1143       (setq bg-mode
1144             (cond (bg-resource (intern (downcase bg-resource)))
1145                   ((< (apply '+ (x-color-values
1146                                  (cdr (assq 'background-color params))
1147                                  frame))
1148                       ;; Just looking at the screen,
1149                       ;; colors whose values add up to .6 of the white total
1150                       ;; still look dark to me.
1151                       (* (apply '+ (x-color-values "white" frame)) .6))
1152                    'dark)
1153                   (t 'light)))
1154       (modify-frame-parameters frame
1155                                (list (cons 'background-mode bg-mode)
1156                                      (cons 'display-type
1157                                            (cond ((x-display-color-p frame)
1158                                                   'color)
1159                                                  ((x-display-grayscale-p frame)
1160                                                   'grayscale)
1161                                                  (t 'mono))))))
1162     frame))
1163
1164 ;; Update a frame's faces when we change its default font.
1165 (defun frame-update-faces (frame)
1166   (let* ((faces global-face-data)
1167          (rest faces))
1168     (while rest
1169       (let* ((face (car (car rest)))
1170              (font (face-font face t)))
1171         (if (listp font)
1172             (let ((bold (memq 'bold font))
1173                   (italic (memq 'italic font)))
1174               ;; Ignore any previous (string-valued) font, it might not even
1175               ;; be the right size anymore.
1176               (set-face-font face nil frame)
1177               (cond ((and bold italic)
1178                      (make-face-bold-italic face frame t))
1179                     (bold
1180                      (make-face-bold face frame t))
1181                     (italic
1182                      (make-face-italic face frame t)))))
1183       (setq rest (cdr rest)))
1184     frame)))
1185
1186 ;; Update the colors of FACE, after FRAME's own colors have been changed.
1187 ;; This applies only to faces with global color specifications
1188 ;; that are not simple constants.
1189 (defun frame-update-face-colors (frame)
1190   (let ((faces global-face-data))
1191     (while faces
1192       (condition-case nil
1193           (let* ((data (cdr (car faces)))
1194                  (face (car (car faces)))
1195                  (foreground (face-foreground data))
1196                  (background (face-background data)))
1197             ;; If the global spec is a specific color,
1198             ;; which doesn't depend on the frame's attributes,
1199             ;; we don't need to recalculate it now.
1200             (or (listp foreground)
1201                 (setq foreground nil))
1202             (or (listp background)
1203                 (setq background nil))
1204             ;; If we are going to frob this face at all,
1205             ;; reinitialize it first.
1206             (if (or foreground background)
1207                 (progn (set-face-foreground face nil frame)
1208                        (set-face-background face nil frame)))
1209             (if foreground
1210                 (face-try-color-list 'set-face-foreground
1211                                      face foreground frame))
1212             (if background
1213                 (face-try-color-list 'set-face-background
1214                                      face background frame)))
1215         (error nil))
1216       (setq faces (cdr faces)))))
1217
1218 ;; Fill in the face FACE from frame-independent face data DATA.
1219 ;; DATA should be the non-frame-specific ("global") face vector
1220 ;; for the face.  FACE should be a face name or face object.
1221 ;; FRAME is the frame to act on; it must be an actual frame, not nil or t.
1222 (defun face-fill-in (face data frame)
1223   (condition-case nil
1224       (let ((foreground (face-foreground data))
1225             (background (face-background data))
1226             (font (face-font data))
1227             (stipple (face-stipple data)))
1228         (set-face-underline-p face (face-underline-p data) frame)
1229         (if foreground
1230             (face-try-color-list 'set-face-foreground
1231                                  face foreground frame))
1232         (if background
1233             (face-try-color-list 'set-face-background
1234                                  face background frame))
1235         (if (listp font)
1236             (let ((bold (memq 'bold font))
1237                   (italic (memq 'italic font)))
1238               (cond ((and bold italic)
1239                      (make-face-bold-italic face frame))
1240                     (bold
1241                      (make-face-bold face frame))
1242                     (italic
1243                      (make-face-italic face frame))))
1244           (if font
1245               (set-face-font face font frame)))
1246         (if stipple
1247             (set-face-stipple face stipple frame)))
1248     (error nil)))
1249
1250 ;; Assuming COLOR is a valid color name,
1251 ;; return t if it can be displayed on FRAME.
1252 (defun face-color-supported-p (frame color background-p)
1253   (and window-system
1254        (or (x-display-color-p frame)
1255            ;; A black-and-white display can implement these.
1256            (member color '("black" "white"))
1257            ;; A black-and-white display can fake gray for background.
1258            (and background-p
1259                 (face-color-gray-p color frame))
1260            ;; A grayscale display can implement colors that are gray (more or less).
1261            (and (x-display-grayscale-p frame)
1262                 (face-color-gray-p color frame)))))
1263
1264 ;; Use FUNCTION to store a color in FACE on FRAME.
1265 ;; COLORS is either a single color or a list of colors.
1266 ;; If it is a list, try the colors one by one until one of them
1267 ;; succeeds.  We signal an error only if all the colors failed.
1268 ;; t as COLORS or as an element of COLORS means to invert the face.
1269 ;; That can't fail, so any subsequent elements after the t are ignored.
1270 (defun face-try-color-list (function face colors frame)
1271   (if (stringp colors)
1272       (if (face-color-supported-p frame colors
1273                                   (eq function 'set-face-background))
1274           (funcall function face colors frame))
1275     (if (eq colors t)
1276         (invert-face face frame)
1277       (let (done)
1278         (while (and colors (not done))
1279           (if (or (memq (car colors) '(t underline))
1280                   (face-color-supported-p frame (car colors)
1281                                           (eq function 'set-face-background)))
1282               (if (cdr colors)
1283                   ;; If there are more colors to try, catch errors
1284                   ;; and set `done' if we succeed.
1285                   (condition-case nil
1286                       (progn
1287                         (cond ((eq (car colors) t)
1288                                (invert-face face frame))
1289                               ((eq (car colors) 'underline)
1290                                (set-face-underline-p face t frame))
1291                               (t
1292                                (funcall function face (car colors) frame)))
1293                         (setq done t))
1294                     (error nil))
1295                 ;; If this is the last color, let the error get out if it fails.
1296                 ;; If it succeeds, we will exit anyway after this iteration.
1297                 (cond ((eq (car colors) t)
1298                        (invert-face face frame))
1299                       ((eq (car colors) 'underline)
1300                        (set-face-underline-p face t frame))
1301                       (t
1302                        (funcall function face (car colors) frame)))))
1303           (setq colors (cdr colors)))))))
1304
1305 ;; If we are already using x-window frames, initialize faces for them.
1306 (if (or (eq (framep (selected-frame)) 'x) (eq (framep (selected-frame)) 'win32))
1307     (face-initialize))
1308
1309 (provide 'faces)
1310
1311 ;;; faces.el ends here