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"))
 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           (stipple      (modify-face-read-string
 236                          face (face-stipple (intern face))
 237                          "stipple" stipples))
 238           (bold-p       (y-or-n-p (concat "Set face " face " bold ")))
 239           (italic-p     (y-or-n-p (concat "Set face " face " italic ")))
 240           (underline-p  (y-or-n-p (concat "Set face " face " underline ")))
 241           (all-frames-p (y-or-n-p (concat "Modify face " face " in all frames "))))
 242      (message "Face %s: %s" face
 243       (mapconcat 'identity
 244        (delq nil
 245         (list (and foreground (concat (downcase foreground) " foreground"))
 246               (and background (concat (downcase background) " background"))
 247               (and stipple (concat (downcase stipple) " stipple"))
 248               (and bold-p "bold") (and italic-p "italic")
 249               (and underline-p "underline"))) ", "))
 250      (list (intern face) foreground background stipple
 251            bold-p italic-p underline-p
 252            (if all-frames-p nil (selected-frame)))))
 253   (condition-case nil
 254       (face-try-color-list 'set-face-foreground face foreground frame)
 255     (error nil))
 256   (condition-case nil
 257       (face-try-color-list 'set-face-background face background frame)
 258     (error nil))
 259   (condition-case nil
 260       (set-face-stipple face stipple frame)
 261     (error nil))
 262   (cond ((eq bold-p nil) (make-face-unbold face frame t))
 263         ((eq bold-p t) (make-face-bold face frame t)))
 264   (cond ((eq italic-p nil) (make-face-unitalic face frame t))
 265         ((eq italic-p t) (make-face-italic face frame t)))
 266   (if (memq underline-p '(nil t))
 267       (set-face-underline-p face underline-p frame))
 268   (and (interactive-p) (redraw-display)))
 269 \f
 270 ;;;; Associating face names (symbols) with their face vectors.
 271
 272 (defvar global-face-data nil
 273   "Internal data for face support functions.  Not for external use.
 274 This is an alist associating face names with the default values for
 275 their parameters.  Newly created frames get their data from here.")
 276
 277 (defun face-list ()
 278   "Returns a list of all defined face names."
 279   (mapcar 'car global-face-data))
 280
 281 (defun internal-find-face (name &optional frame)
 282   "Retrieve the face named NAME.  Return nil if there is no such face.
 283 If the optional argument FRAME is given, this gets the face NAME for
 284 that frame; otherwise, it uses the selected frame.
 285 If FRAME is the symbol t, then the global, non-frame face is returned.
 286 If NAME is already a face, it is simply returned."
 287   (if (and (eq frame t) (not (symbolp name)))
 288       (setq name (face-name name)))
 289   (if (symbolp name)
 290       (cdr (assq name
 291                  (if (eq frame t)
 292                      global-face-data
 293                    (frame-face-alist (or frame (selected-frame))))))
 294     (internal-check-face name)
 295     name))
 296
 297 (defun internal-get-face (name &optional frame)
 298   "Retrieve the face named NAME; error if there is none.
 299 If the optional argument FRAME is given, this gets the face NAME for
 300 that frame; otherwise, it uses the selected frame.
 301 If FRAME is the symbol t, then the global, non-frame face is returned.
 302 If NAME is already a face, it is simply returned."
 303   (or (internal-find-face name frame)
 304       (internal-check-face name)))
 305
 306
 307 (defun internal-set-face-1 (face name value index frame)
 308   (let ((inhibit-quit t))
 309     (if (null frame)
 310         (let ((frames (frame-list)))
 311           (while frames
 312             (internal-set-face-1 (face-name face) name value index (car frames))
 313             (setq frames (cdr frames)))
 314           (aset (internal-get-face (if (symbolp face) face (face-name face)) t)
 315                 index value)
 316           value)
 317       (or (eq frame t)
 318           (set-face-attribute-internal (face-id face) name value frame))
 319       (aset (internal-get-face face frame) index value))))
 320
 321
 322 (defun read-face-name (prompt)
 323   (let (face)
 324     (while (= (length face) 0)
 325       (setq face (completing-read prompt
 326                                   (mapcar '(lambda (x) (list (symbol-name x)))
 327                                           (face-list))
 328                                   nil t)))
 329     (intern face)))
 330
 331 (defun internal-face-interactive (what &optional bool)
 332   (let* ((fn (intern (concat "face-" what)))
 333          (prompt (concat "Set " what " of face"))
 334          (face (read-face-name (concat prompt ": ")))
 335          (default (if (fboundp fn)
 336                       (or (funcall fn face (selected-frame))
 337                           (funcall fn 'default (selected-frame)))))
 338          (value (if bool
 339                     (y-or-n-p (concat "Should face " (symbol-name face)
 340                                       " be " bool "? "))
 341                   (read-string (concat prompt " " (symbol-name face) " to: ")
 342                                default))))
 343     (list face (if (equal value "") nil value))))
 344
 345
 346
 347 (defun make-face (name)
 348   "Define a new FACE on all frames.
 349 You can modify the font, color, etc of this face with the set-face- functions.
 350 If the face already exists, it is unmodified."
 351   (interactive "SMake face: ")
 352   (or (internal-find-face name)
 353       (let ((face (make-vector 8 nil)))
 354         (aset face 0 'face)
 355         (aset face 1 name)
 356         (let* ((frames (frame-list))
 357                (inhibit-quit t)
 358                (id (internal-next-face-id)))
 359           (make-face-internal id)
 360           (aset face 2 id)
 361           (while frames
 362             (set-frame-face-alist (car frames)
 363                                   (cons (cons name (copy-sequence face))
 364                                         (frame-face-alist (car frames))))
 365             (setq frames (cdr frames)))
 366           (setq global-face-data (cons (cons name face) global-face-data)))
 367         ;; when making a face after frames already exist
 368         (if (or (eq window-system 'x) (eq window-system 'win32))
 369             (make-face-x-resource-internal face))
 370         ;; add to menu
 371         (if (fboundp 'facemenu-add-new-face)
 372             (facemenu-add-new-face name))
 373         face))
 374   name)
 375
 376 ;; Fill in a face by default based on X resources, for all existing frames.
 377 ;; This has to be done when a new face is made.
 378 (defun make-face-x-resource-internal (face &optional frame set-anyway)
 379   (cond ((null frame)
 380          (let ((frames (frame-list)))
 381            (while frames
 382              (if (or (eq (framep (car frames)) 'x) (eq (framep (car frames)) 'win32))
 383                  (make-face-x-resource-internal (face-name face)
 384                                                 (car frames) set-anyway))
 385              (setq frames (cdr frames)))))
 386         (t
 387          (setq face (internal-get-face (face-name face) frame))
 388          ;;
 389          ;; These are things like "attributeForeground" instead of simply
 390          ;; "foreground" because people tend to do things like "*foreground",
 391          ;; which would cause all faces to be fully qualified, making faces
 392          ;; inherit attributes in a non-useful way.  So we've made them slightly
 393          ;; less obvious to specify in order to make them work correctly in
 394          ;; more random environments.
 395          ;;
 396          ;; I think these should be called "face.faceForeground" instead of
 397          ;; "face.attributeForeground", but they're the way they are for
 398          ;; hysterical reasons.
 399          ;;
 400          (let* ((name (symbol-name (face-name face)))
 401                 (fn  (or (x-get-resource (concat name ".attributeFont")
 402                                          "Face.AttributeFont")
 403                          (and set-anyway (face-font face))))
 404                 (fg  (or (x-get-resource (concat name ".attributeForeground")
 405                                          "Face.AttributeForeground")
 406                          (and set-anyway (face-foreground face))))
 407                 (bg  (or (x-get-resource (concat name ".attributeBackground")
 408                                          "Face.AttributeBackground")
 409                          (and set-anyway (face-background face))))
 410                 (bgp (or (x-get-resource (concat name ".attributeStipple")
 411                                          "Face.AttributeStipple")
 412                          (x-get-resource (concat name ".attributeBackgroundPixmap")
 413                                          "Face.AttributeBackgroundPixmap")
 414                          (and set-anyway (face-stipple face))))
 415                 (ulp (let ((resource (x-get-resource
 416                                       (concat name ".attributeUnderline")
 417                                       "Face.AttributeUnderline")))
 418                        (if resource
 419                            (member (downcase resource) '("on" "true"))
 420                          (and set-anyway (face-underline-p face)))))
 421                 )
 422            (if fn
 423                (condition-case ()
 424                    (cond ((string= fn "italic")
 425                           (make-face-italic face))
 426                          ((string= fn "bold")
 427                           (make-face-bold face))
 428                          ((string= fn "bold-italic")
 429                           (make-face-bold-italic face))
 430                          (t
 431                           (set-face-font face fn frame)))
 432                  (error
 433                   (if (member fn '("italic" "bold" "bold-italic"))
 434                       (message "no %s version found for face `%s'" fn name)
 435                     (message "font `%s' not found for face `%s'" fn name)))))
 436            (if fg
 437                (condition-case ()
 438                    (set-face-foreground face fg frame)
 439                  (error (message "color `%s' not allocated for face `%s'" fg name))))
 440            (if bg
 441                (condition-case ()
 442                    (set-face-background face bg frame)
 443                  (error (message "color `%s' not allocated for face `%s'" bg name))))
 444            (if bgp
 445                (condition-case ()
 446                    (set-face-stipple face bgp frame)
 447                  (error (message "pixmap `%s' not found for face `%s'" bgp name))))
 448            (if (or ulp set-anyway)
 449                (set-face-underline-p face ulp frame))
 450            )))
 451   face)
 452
 453 (defun copy-face (old-face new-face &optional frame new-frame)
 454   "Define a face just like OLD-FACE, with name NEW-FACE.
 455 If NEW-FACE already exists as a face, it is modified to be like OLD-FACE.
 456 If it doesn't already exist, it is created.
 457
 458 If the optional argument FRAME is given as a frame,
 459 NEW-FACE is changed on FRAME only.
 460 If FRAME is t, the frame-independent default specification for OLD-FACE
 461 is copied to NEW-FACE.
 462 If FRAME is nil, copying is done for the frame-independent defaults
 463 and for each existing frame.
 464 If the optional fourth argument NEW-FRAME is given,
 465 copy the information from face OLD-FACE on frame FRAME
 466 to NEW-FACE on frame NEW-FRAME."
 467   (or new-frame (setq new-frame frame))
 468   (let ((inhibit-quit t))
 469     (if (null frame)
 470         (let ((frames (frame-list)))
 471           (while frames
 472             (copy-face old-face new-face (car frames))
 473             (setq frames (cdr frames)))
 474           (copy-face old-face new-face t))
 475       (setq old-face (internal-get-face old-face frame))
 476       (setq new-face (or (internal-find-face new-face new-frame)
 477                          (make-face new-face)))
 478       (condition-case nil
 479           ;; A face that has a global symbolic font modifier such as `bold'
 480           ;; might legitimately get an error here.
 481           ;; Use the frame's default font in that case.
 482           (set-face-font new-face (face-font old-face frame) new-frame)
 483         (error
 484          (set-face-font new-face nil new-frame)))
 485       (set-face-foreground new-face (face-foreground old-face frame) new-frame)
 486       (set-face-background new-face (face-background old-face frame) new-frame)
 487       (set-face-stipple new-face
 488                         (face-stipple old-face frame)
 489                         new-frame)
 490       (set-face-underline-p new-face (face-underline-p old-face frame)
 491                             new-frame))
 492     new-face))
 493
 494 (defun face-equal (face1 face2 &optional frame)
 495   "True if the faces FACE1 and FACE2 display in the same way."
 496   (setq face1 (internal-get-face face1 frame)
 497         face2 (internal-get-face face2 frame))
 498   (and (equal (face-foreground face1 frame) (face-foreground face2 frame))
 499        (equal (face-background face1 frame) (face-background face2 frame))
 500        (equal (face-font face1 frame) (face-font face2 frame))
 501        (eq (face-underline-p face1 frame) (face-underline-p face2 frame))
 502        (equal (face-stipple face1 frame)
 503               (face-stipple face2 frame))))
 504
 505 (defun face-differs-from-default-p (face &optional frame)
 506   "True if face FACE displays differently from the default face, on FRAME.
 507 A face is considered to be ``the same'' as the default face if it is
 508 actually specified in the same way (equivalent fonts, etc) or if it is
 509 fully unspecified, and thus inherits the attributes of any face it
 510 is displayed on top of.
 511
 512 The optional argument FRAME specifies which frame to test;
 513 if FRAME is t, test the default for new frames.
 514 If FRAME is nil or omitted, test the selected frame."
 515   (let ((default (internal-get-face 'default frame)))
 516     (setq face (internal-get-face face frame))
 517     (not (and (or (equal (face-foreground default frame)
 518                          (face-foreground face frame))
 519                   (null (face-foreground face frame)))
 520               (or (equal (face-background default frame)
 521                          (face-background face frame))
 522                   (null (face-background face frame)))
 523               (or (equal (face-font default frame) (face-font face frame))
 524                   (null (face-font face frame)))
 525               (or (equal (face-stipple default frame)
 526                          (face-stipple face frame))
 527                   (null (face-stipple face frame)))
 528               (equal (face-underline-p default frame)
 529                      (face-underline-p face frame))
 530               ))))
 531
 532 (defun face-nontrivial-p (face &optional frame)
 533   "True if face FACE has some non-nil attribute.
 534 The optional argument FRAME specifies which frame to test;
 535 if FRAME is t, test the default for new frames.
 536 If FRAME is nil or omitted, test the selected frame."
 537   (setq face (internal-get-face face frame))
 538   (or (face-foreground face frame)
 539       (face-background face frame)
 540       (face-font face frame)
 541       (face-stipple face frame)
 542       (face-underline-p face frame)))
 543
 544
 545 (defun invert-face (face &optional frame)
 546   "Swap the foreground and background colors of face FACE.
 547 If the face doesn't specify both foreground and background, then
 548 set its foreground and background to the default background and foreground."
 549   (interactive (list (read-face-name "Invert face: ")))
 550   (setq face (internal-get-face face frame))
 551   (let ((fg (face-foreground face frame))
 552         (bg (face-background face frame)))
 553     (if (or fg bg)
 554         (progn
 555           (set-face-foreground face bg frame)
 556           (set-face-background face fg frame))
 557       (set-face-foreground face (or (face-background 'default frame)
 558                                     (cdr (assq 'background-color (frame-parameters frame))))
 559                            frame)
 560       (set-face-background face (or (face-foreground 'default frame)
 561                                     (cdr (assq 'foreground-color (frame-parameters frame))))
 562                            frame)))
 563   face)
 564
 565
 566 (defun internal-try-face-font (face font &optional frame)
 567   "Like set-face-font, but returns nil on failure instead of an error."
 568   (condition-case ()
 569       (set-face-font face font frame)
 570     (error nil)))
 571 \f
 572 ;; Manipulating font names.
 573
 574 (defconst x-font-regexp nil)
 575 (defconst x-font-regexp-head nil)
 576 (defconst x-font-regexp-weight nil)
 577 (defconst x-font-regexp-slant nil)
 578
 579 (defconst x-font-regexp-weight-subnum 1)
 580 (defconst x-font-regexp-slant-subnum 2)
 581 (defconst x-font-regexp-swidth-subnum 3)
 582 (defconst x-font-regexp-adstyle-subnum 4)
 583
 584 ;;; Regexps matching font names in "Host Portable Character Representation."
 585 ;;;
 586 (let ((-                "[-?]")
 587       (foundry          "[^-]+")
 588       (family           "[^-]+")
 589       (weight           "\\(bold\\|demibold\\|medium\\)")               ; 1
 590 ;     (weight\?         "\\(\\*\\|bold\\|demibold\\|medium\\|\\)")      ; 1
 591       (weight\?         "\\([^-]*\\)")                                  ; 1
 592       (slant            "\\([ior]\\)")                                  ; 2
 593 ;     (slant\?          "\\([ior?*]?\\)")                               ; 2
 594       (slant\?          "\\([^-]?\\)")                                  ; 2
 595 ;     (swidth           "\\(\\*\\|normal\\|semicondensed\\|\\)")        ; 3
 596       (swidth           "\\([^-]*\\)")                                  ; 3
 597 ;     (adstyle          "\\(\\*\\|sans\\|\\)")                          ; 4
 598       (adstyle          "\\([^-]*\\)")                                  ; 4
 599       (pixelsize        "[0-9]+")
 600       (pointsize        "[0-9][0-9]+")
 601       (resx             "[0-9][0-9]+")
 602       (resy             "[0-9][0-9]+")
 603       (spacing          "[cmp?*]")
 604       (avgwidth         "[0-9]+")
 605       (registry         "[^-]+")
 606       (encoding         "[^-]+")
 607       )
 608   (setq x-font-regexp
 609         (concat "\\`\\*?[-?*]"
 610                 foundry - family - weight\? - slant\? - swidth - adstyle -
 611                 pixelsize - pointsize - resx - resy - spacing - avgwidth -
 612                 registry - encoding "\\*?\\'"
 613                 ))
 614   (setq x-font-regexp-head
 615         (concat "\\`[-?*]" foundry - family - weight\? - slant\?
 616                 "\\([-*?]\\|\\'\\)"))
 617   (setq x-font-regexp-slant (concat - slant -))
 618   (setq x-font-regexp-weight (concat - weight -))
 619   nil)
 620
 621 (defun x-resolve-font-name (pattern &optional face frame)
 622   "Return a font name matching PATTERN.
 623 All wildcards in PATTERN become substantiated.
 624 If PATTERN is nil, return the name of the frame's base font, which never
 625 contains wildcards.
 626 Given optional arguments FACE and FRAME, return a font which is
 627 also the same size as FACE on FRAME, or fail."
 628   (or (symbolp face)
 629       (setq face (face-name face)))
 630   (and (eq frame t)
 631        (setq frame nil))
 632   (if pattern
 633       ;; Note that x-list-fonts has code to handle a face with nil as its font.
 634       (let ((fonts (x-list-fonts pattern face frame)))
 635         (or fonts
 636             (if face
 637                 (if (string-match "\\*" pattern)
 638                     (if (null (face-font face))
 639                         (error "No matching fonts are the same height as the frame default font")
 640                       (error "No matching fonts are the same height as face `%s'" face))
 641                   (if (null (face-font face))
 642                       (error "Height of font `%s' doesn't match the frame default font"
 643                              pattern)
 644                     (error "Height of font `%s' doesn't match face `%s'"
 645                            pattern face)))
 646               (error "No fonts match `%s'" pattern)))
 647         (car fonts))
 648     (cdr (assq 'font (frame-parameters (selected-frame))))))
 649
 650 (defun x-frob-font-weight (font which)
 651   (let ((case-fold-search t))
 652     (cond ((string-match x-font-regexp font)
 653            (concat (substring font 0
 654                               (match-beginning x-font-regexp-weight-subnum))
 655                    which
 656                    (substring font (match-end x-font-regexp-weight-subnum)
 657                               (match-beginning x-font-regexp-adstyle-subnum))
 658                    ;; Replace the ADD_STYLE_NAME field with *
 659                    ;; because the info in it may not be the same
 660                    ;; for related fonts.
 661                    "*"
 662                    (substring font (match-end x-font-regexp-adstyle-subnum))))
 663           ((string-match x-font-regexp-head font)
 664            (concat (substring font 0 (match-beginning 1)) which
 665                    (substring font (match-end 1))))
 666           ((string-match x-font-regexp-weight font)
 667            (concat (substring font 0 (match-beginning 1)) which
 668                    (substring font (match-end 1)))))))
 669
 670 (defun x-frob-font-slant (font which)
 671   (let ((case-fold-search t))
 672     (cond ((string-match x-font-regexp font)
 673            (concat (substring font 0
 674                               (match-beginning x-font-regexp-slant-subnum))
 675                    which
 676                    (substring font (match-end x-font-regexp-slant-subnum)
 677                               (match-beginning x-font-regexp-adstyle-subnum))
 678                    ;; Replace the ADD_STYLE_NAME field with *
 679                    ;; because the info in it may not be the same
 680                    ;; for related fonts.
 681                    "*"
 682                    (substring font (match-end x-font-regexp-adstyle-subnum))))
 683           ((string-match x-font-regexp-head font)
 684            (concat (substring font 0 (match-beginning 2)) which
 685                    (substring font (match-end 2))))
 686           ((string-match x-font-regexp-slant font)
 687            (concat (substring font 0 (match-beginning 1)) which
 688                    (substring font (match-end 1)))))))
 689
 690 (defun x-make-font-bold (font)
 691   "Given an X font specification, make a bold version of it.
 692 If that can't be done, return nil."
 693   (x-frob-font-weight font "bold"))
 694
 695 (defun x-make-font-demibold (font)
 696   "Given an X font specification, make a demibold version of it.
 697 If that can't be done, return nil."
 698   (x-frob-font-weight font "demibold"))
 699
 700 (defun x-make-font-unbold (font)
 701   "Given an X font specification, make a non-bold version of it.
 702 If that can't be done, return nil."
 703   (x-frob-font-weight font "medium"))
 704
 705 (defun x-make-font-italic (font)
 706   "Given an X font specification, make an italic version of it.
 707 If that can't be done, return nil."
 708   (x-frob-font-slant font "i"))
 709
 710 (defun x-make-font-oblique (font) ; you say tomayto...
 711   "Given an X font specification, make an oblique version of it.
 712 If that can't be done, return nil."
 713   (x-frob-font-slant font "o"))
 714
 715 (defun x-make-font-unitalic (font)
 716   "Given an X font specification, make a non-italic version of it.
 717 If that can't be done, return nil."
 718   (x-frob-font-slant font "r"))
 719 \f
 720 ;;; non-X-specific interface
 721
 722 (defun make-face-bold (face &optional frame noerror)
 723   "Make the font of the given face be bold, if possible.
 724 If NOERROR is non-nil, return nil on failure."
 725   (interactive (list (read-face-name "Make which face bold: ")))
 726   (if (and (eq frame t) (listp (face-font face t)))
 727       (set-face-font face (if (memq 'italic (face-font face t))
 728                               '(bold italic) '(bold))
 729                      t)
 730     (let (font)
 731       (if (null frame)
 732           (let ((frames (frame-list)))
 733             ;; Make this face bold in global-face-data.
 734             (make-face-bold face t noerror)
 735             ;; Make this face bold in each frame.
 736             (while frames
 737               (make-face-bold face (car frames) noerror)
 738               (setq frames (cdr frames))))
 739         (setq face (internal-get-face face frame))
 740         (setq font (or (face-font face frame)
 741                        (face-font face t)))
 742         (if (listp font)
 743             (setq font nil))
 744         (setq font (or font
 745                        (face-font 'default frame)
 746                        (cdr (assq 'font (frame-parameters frame)))))
 747         (or (and font (make-face-bold-internal face frame font))
 748             ;; We failed to find a bold version of the font.
 749             noerror
 750             (error "No bold version of %S" font))))))
 751
 752 (defun make-face-bold-internal (face frame font)
 753   (let (f2)
 754     (or (and (setq f2 (x-make-font-bold font))
 755              (internal-try-face-font face f2 frame))
 756         (and (setq f2 (x-make-font-demibold font))
 757              (internal-try-face-font face f2 frame)))))
 758
 759 (defun make-face-italic (face &optional frame noerror)
 760   "Make the font of the given face be italic, if possible.
 761 If NOERROR is non-nil, return nil on failure."
 762   (interactive (list (read-face-name "Make which face italic: ")))
 763   (if (and (eq frame t) (listp (face-font face t)))
 764       (set-face-font face (if (memq 'bold (face-font face t))
 765                               '(bold italic) '(italic))
 766                      t)
 767     (let (font)
 768       (if (null frame)
 769           (let ((frames (frame-list)))
 770             ;; Make this face italic in global-face-data.
 771             (make-face-italic face t noerror)
 772             ;; Make this face italic in each frame.
 773             (while frames
 774               (make-face-italic face (car frames) noerror)
 775               (setq frames (cdr frames))))
 776         (setq face (internal-get-face face frame))
 777         (setq font (or (face-font face frame)
 778                        (face-font face t)))
 779         (if (listp font)
 780             (setq font nil))
 781         (setq font (or font
 782                        (face-font 'default frame)
 783                        (cdr (assq 'font (frame-parameters frame)))))
 784         (or (and font (make-face-italic-internal face frame font))
 785             ;; We failed to find an italic version of the font.
 786             noerror
 787             (error "No italic version of %S" font))))))
 788
 789 (defun make-face-italic-internal (face frame font)
 790   (let (f2)
 791     (or (and (setq f2 (x-make-font-italic font))
 792              (internal-try-face-font face f2 frame))
 793         (and (setq f2 (x-make-font-oblique font))
 794              (internal-try-face-font face f2 frame)))))
 795
 796 (defun make-face-bold-italic (face &optional frame noerror)
 797   "Make the font of the given face be bold and italic, if possible.
 798 If NOERROR is non-nil, return nil on failure."
 799   (interactive (list (read-face-name "Make which face bold-italic: ")))
 800   (if (and (eq frame t) (listp (face-font face t)))
 801       (set-face-font face '(bold italic) t)
 802     (let (font)
 803       (if (null frame)
 804           (let ((frames (frame-list)))
 805             ;; Make this face bold-italic in global-face-data.
 806             (make-face-bold-italic face t noerror)
 807             ;; Make this face bold in each frame.
 808             (while frames
 809               (make-face-bold-italic face (car frames) noerror)
 810               (setq frames (cdr frames))))
 811         (setq face (internal-get-face face frame))
 812         (setq font (or (face-font face frame)
 813                        (face-font face t)))
 814         (if (listp font)
 815             (setq font nil))
 816         (setq font (or font
 817                        (face-font 'default frame)
 818                        (cdr (assq 'font (frame-parameters frame)))))
 819         (or (and font (make-face-bold-italic-internal face frame font))
 820             ;; We failed to find a bold italic version.
 821             noerror
 822             (error "No bold italic version of %S" font))))))
 823
 824 (defun make-face-bold-italic-internal (face frame font)
 825   (let (f2 f3)
 826     (or (and (setq f2 (x-make-font-italic font))
 827              (not (equal font f2))
 828              (setq f3 (x-make-font-bold f2))
 829              (not (equal f2 f3))
 830              (internal-try-face-font face f3 frame))
 831         (and (setq f2 (x-make-font-oblique font))
 832              (not (equal font f2))
 833              (setq f3 (x-make-font-bold f2))
 834              (not (equal f2 f3))
 835              (internal-try-face-font face f3 frame))
 836         (and (setq f2 (x-make-font-italic font))
 837              (not (equal font f2))
 838              (setq f3 (x-make-font-demibold f2))
 839              (not (equal f2 f3))
 840              (internal-try-face-font face f3 frame))
 841         (and (setq f2 (x-make-font-oblique font))
 842              (not (equal font f2))
 843              (setq f3 (x-make-font-demibold f2))
 844              (not (equal f2 f3))
 845              (internal-try-face-font face f3 frame)))))
 846
 847 (defun make-face-unbold (face &optional frame noerror)
 848   "Make the font of the given face be non-bold, if possible.
 849 If NOERROR is non-nil, return nil on failure."
 850   (interactive (list (read-face-name "Make which face non-bold: ")))
 851   (if (and (eq frame t) (listp (face-font face t)))
 852       (set-face-font face (if (memq 'italic (face-font face t))
 853                               '(italic) nil)
 854                      t)
 855     (let (font font1)
 856       (if (null frame)
 857           (let ((frames (frame-list)))
 858             ;; Make this face unbold in global-face-data.
 859             (make-face-unbold face t noerror)
 860             ;; Make this face unbold in each frame.
 861             (while frames
 862               (make-face-unbold face (car frames) noerror)
 863               (setq frames (cdr frames))))
 864         (setq face (internal-get-face face frame))
 865         (setq font1 (or (face-font face frame)
 866                         (face-font face t)))
 867         (if (listp font1)
 868             (setq font1 nil))
 869         (setq font1 (or font1
 870                         (face-font 'default frame)
 871                         (cdr (assq 'font (frame-parameters frame)))))
 872         (setq font (and font1 (x-make-font-unbold font1)))
 873         (or (if font (internal-try-face-font face font frame))
 874             noerror
 875             (error "No unbold version of %S" font1))))))
 876
 877 (defun make-face-unitalic (face &optional frame noerror)
 878   "Make the font of the given face be non-italic, if possible.
 879 If NOERROR is non-nil, return nil on failure."
 880   (interactive (list (read-face-name "Make which face non-italic: ")))
 881   (if (and (eq frame t) (listp (face-font face t)))
 882       (set-face-font face (if (memq 'bold (face-font face t))
 883                               '(bold) nil)
 884                      t)
 885     (let (font font1)
 886       (if (null frame)
 887           (let ((frames (frame-list)))
 888             ;; Make this face unitalic in global-face-data.
 889             (make-face-unitalic face t noerror)
 890             ;; Make this face unitalic in each frame.
 891             (while frames
 892               (make-face-unitalic face (car frames) noerror)
 893               (setq frames (cdr frames))))
 894         (setq face (internal-get-face face frame))
 895         (setq font1 (or (face-font face frame)
 896                         (face-font face t)))
 897         (if (listp font1)
 898             (setq font1 nil))
 899         (setq font1 (or font1
 900                         (face-font 'default frame)
 901                         (cdr (assq 'font (frame-parameters frame)))))
 902         (setq font (and font1 (x-make-font-unitalic font1)))
 903         (or (if font (internal-try-face-font face font frame))
 904             noerror
 905             (error "No unitalic version of %S" font1))))))
 906 \f
 907 (defvar list-faces-sample-text
 908   "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 909   "*Text string to display as the sample text for `list-faces-display'.")
 910
 911 ;; The name list-faces would be more consistent, but let's avoid a conflict
 912 ;; with Lucid, which uses that name differently.
 913 (defun list-faces-display ()
 914   "List all faces, using the same sample text in each.
 915 The sample text is a string that comes from the variable
 916 `list-faces-sample-text'.
 917
 918 It is possible to give a particular face name different appearances in
 919 different frames.  This command shows the appearance in the
 920 selected frame."
 921   (interactive)
 922   (let ((faces (sort (face-list) (function string-lessp)))
 923         (face nil)
 924         (frame (selected-frame))
 925         disp-frame window)
 926     (with-output-to-temp-buffer "*Faces*"
 927       (save-excursion
 928         (set-buffer standard-output)
 929         (setq truncate-lines t)
 930         (while faces
 931           (setq face (car faces))
 932           (setq faces (cdr faces))
 933           (insert (format "%25s " (symbol-name face)))
 934           (let ((beg (point)))
 935             (insert list-faces-sample-text)
 936             (insert "\n")
 937             (put-text-property beg (1- (point)) 'face face)
 938             ;; If the sample text has multiple lines, line up all of them.
 939             (goto-char beg)
 940             (forward-line 1)
 941             (while (not (eobp))
 942               (insert "                          ")
 943               (forward-line 1))))
 944         (goto-char (point-min))))
 945     ;; If the *Faces* buffer appears in a different frame,
 946     ;; copy all the face definitions from FRAME,
 947     ;; so that the display will reflect the frame that was selected.
 948     (setq window (get-buffer-window (get-buffer "*Faces*") t))
 949     (setq disp-frame (if window (window-frame window)
 950                        (car (frame-list))))
 951     (or (eq frame disp-frame)
 952         (let ((faces (face-list)))
 953           (while faces
 954             (copy-face (car faces) (car faces) frame disp-frame)
 955             (setq faces (cdr faces)))))))
 956
 957 (defun describe-face (face)
 958   "Display the properties of face FACE."
 959   (interactive (list (read-face-name "Describe face: ")))
 960   (with-output-to-temp-buffer "*Help*"
 961     (princ "Properties of face `")
 962     (princ (face-name face))
 963     (princ "':") (terpri)
 964     (princ "Foreground: ") (princ (face-foreground face)) (terpri)
 965     (princ "Background: ") (princ (face-background face)) (terpri)
 966     (princ "      Font: ") (princ (face-font face)) (terpri)
 967     (princ "Underlined: ") (princ (if (face-underline-p face) "yes" "no")) (terpri)
 968     (princ "   Stipple: ") (princ (or (face-stipple face) "none"))))
 969 \f
 970 ;;; Make the standard faces.
 971 ;;; The C code knows the default and modeline faces as faces 0 and 1,
 972 ;;; so they must be the first two faces made.
 973 (defun face-initialize ()
 974   (make-face 'default)
 975   (make-face 'modeline)
 976   (make-face 'highlight)
 977
 978   ;; These aren't really special in any way, but they're nice to have around.
 979
 980   (make-face 'bold)
 981   (make-face 'italic)
 982   (make-face 'bold-italic)
 983   (make-face 'region)
 984   (make-face 'secondary-selection)
 985   (make-face 'underline)
 986
 987   (setq region-face (face-id 'region))
 988
 989   ;; Specify the global properties of these faces
 990   ;; so they will come out right on new frames.
 991
 992   (make-face-bold 'bold t)
 993   (make-face-italic 'italic t)
 994   (make-face-bold-italic 'bold-italic t)
 995
 996   (set-face-background 'highlight '("darkseagreen2" "green" t) t)
 997   (set-face-background 'region '("gray" underline) t)
 998   (set-face-background 'secondary-selection '("paleturquoise" "green" t) t)
 999   (set-face-background 'modeline '(t) t)
1000   (set-face-underline-p 'underline t t)
1001
1002   ;; Set up the faces of all existing X Window frames
1003   ;; from those global properties, unless already set in a given frame.
1004
1005   (let ((frames (frame-list)))
1006     (while frames
1007       (if (not (memq (framep (car frames)) '(t nil)))
1008           (let ((frame (car frames))
1009                 (rest global-face-data))
1010             (while rest
1011               (let ((face (car (car rest))))
1012                 (or (face-differs-from-default-p face)
1013                     (face-fill-in face (cdr (car rest)) frame)))
1014               (setq rest (cdr rest)))))
1015       (setq frames (cdr frames)))))
1016
1017 \f
1018 ;; Like x-create-frame but also set up the faces.
1019
1020 (defun x-create-frame-with-faces (&optional parameters)
1021   ;; Read this frame's geometry resource, if it has an explicit name,
1022   ;; and put the specs into PARAMETERS.
1023   (let* ((name (or (cdr (assq 'name parameters))
1024                    (cdr (assq 'name default-frame-alist))))
1025          (x-resource-name name)
1026          (res-geometry (if name (x-get-resource "geometry" "Geometry")))
1027          parsed)
1028     (if res-geometry
1029         (progn
1030           (setq parsed (x-parse-geometry res-geometry))
1031           ;; If the resource specifies a position,
1032           ;; call the position and size "user-specified".
1033           (if (or (assq 'top parsed) (assq 'left parsed))
1034               (setq parsed (cons '(user-position . t)
1035                                  (cons '(user-size . t) parsed))))
1036           ;; Put the geometry parameters at the end.
1037           ;; Copy default-frame-alist so that they go after it.
1038           (setq parameters (append parameters
1039                                    default-frame-alist
1040                                    parsed)))))
1041   (let (frame)
1042     (if (null global-face-data)
1043         (setq frame (x-create-frame parameters))
1044       (let* ((visibility-spec (assq 'visibility parameters))
1045              (faces (copy-alist global-face-data))
1046              success
1047              (rest faces))
1048         (setq frame (x-create-frame (cons '(visibility . nil) parameters)))
1049         (unwind-protect
1050             (progn
1051               (set-frame-face-alist frame faces)
1052
1053               (if (cdr (or (assq 'reverse parameters)
1054                            (assq 'reverse default-frame-alist)
1055                            (let ((resource (x-get-resource "reverseVideo"
1056                                                            "ReverseVideo")))
1057                              (if resource
1058                                  (cons nil (member (downcase resource)
1059                                                    '("on" "true")))))))
1060                   (let* ((params (frame-parameters frame))
1061                          (bg (cdr (assq 'foreground-color params)))
1062                          (fg (cdr (assq 'background-color params))))
1063                     (modify-frame-parameters frame
1064                                              (list (cons 'foreground-color fg)
1065                                                    (cons 'background-color bg)))
1066                     (if (equal bg (cdr (assq 'border-color params)))
1067                         (modify-frame-parameters frame
1068                                                  (list (cons 'border-color fg))))
1069                     (if (equal bg (cdr (assq 'mouse-color params)))
1070                         (modify-frame-parameters frame
1071                                                  (list (cons 'mouse-color fg))))
1072                     (if (equal bg (cdr (assq 'cursor-color params)))
1073                         (modify-frame-parameters frame
1074                                                  (list (cons 'cursor-color fg))))))
1075               ;; Copy the vectors that represent the faces.
1076               ;; Also fill them in from X resources.
1077               (while rest
1078                 (let ((global (cdr (car rest))))
1079                   (setcdr (car rest) (vector 'face
1080                                              (face-name (cdr (car rest)))
1081                                              (face-id (cdr (car rest)))
1082                                              nil nil nil nil nil))
1083                   (face-fill-in (car (car rest)) global frame))
1084                 (make-face-x-resource-internal (cdr (car rest)) frame t)
1085                 (setq rest (cdr rest)))
1086               (if (null visibility-spec)
1087                   (make-frame-visible frame)
1088                 (modify-frame-parameters frame (list visibility-spec)))
1089               (setq success t))
1090           (or success
1091               (delete-frame frame)))))
1092     ;; Set up the background-mode frame parameter
1093     ;; so that programs can decide good ways of highlighting
1094     ;; on this frame.
1095     (let ((bg-resource (x-get-resource ".backgroundMode"
1096                                        "BackgroundMode"))
1097           (params (frame-parameters frame))
1098           (bg-mode))
1099       (setq bg-mode
1100             (cond (bg-resource (intern (downcase bg-resource)))
1101                   ((< (apply '+ (x-color-values
1102                                  (cdr (assq 'background-color params))
1103                                  frame))
1104                       (/ (apply '+ (x-color-values "white" frame)) 3))
1105                    'dark)
1106                   (t 'light)))
1107       (modify-frame-parameters frame
1108                                (list (cons 'background-mode bg-mode)
1109                                      (cons 'display-type
1110                                            (cond ((x-display-color-p frame)
1111                                                   'color)
1112                                                  ((x-display-grayscale-p frame)
1113                                                   'grayscale)
1114                                                  (t 'mono))))))
1115     frame))
1116
1117 ;; Update a frame's faces when we change its default font.
1118 (defun frame-update-faces (frame)
1119   (let* ((faces global-face-data)
1120          (rest faces))
1121     (while rest
1122       (let* ((face (car (car rest)))
1123              (font (face-font face t)))
1124         (if (listp font)
1125             (let ((bold (memq 'bold font))
1126                   (italic (memq 'italic font)))
1127               ;; Ignore any previous (string-valued) font, it might not even
1128               ;; be the right size anymore.
1129               (set-face-font face nil frame)
1130               (cond ((and bold italic)
1131                      (make-face-bold-italic face frame t))
1132                     (bold
1133                      (make-face-bold face frame t))
1134                     (italic
1135                      (make-face-italic face frame t)))))
1136       (setq rest (cdr rest)))
1137     frame)))
1138
1139 ;; Update the colors of FACE, after FRAME's own colors have been changed.
1140 ;; This applies only to faces with global color specifications
1141 ;; that are not simple constants.
1142 (defun frame-update-face-colors (frame)
1143   (let ((faces global-face-data))
1144     (while faces
1145       (condition-case nil
1146           (let* ((data (cdr (car faces)))
1147                  (face (car (car faces)))
1148                  (foreground (face-foreground data))
1149                  (background (face-background data)))
1150             ;; If the global spec is a specific color,
1151             ;; which doesn't depend on the frame's attributes,
1152             ;; we don't need to recalculate it now.
1153             (or (listp foreground)
1154                 (setq foreground nil))
1155             (or (listp background)
1156                 (setq background nil))
1157             ;; If we are going to frob this face at all,
1158             ;; reinitialize it first.
1159             (if (or foreground background)
1160                 (progn (set-face-foreground face nil frame)
1161                        (set-face-background face nil frame)))
1162             (if foreground
1163                 (face-try-color-list 'set-face-foreground
1164                                      face foreground frame))
1165             (if background
1166                 (face-try-color-list 'set-face-background
1167                                      face background frame)))
1168         (error nil))
1169       (setq faces (cdr faces)))))
1170
1171 ;; Fill in the face FACE from frame-independent face data DATA.
1172 ;; DATA should be the non-frame-specific ("global") face vector
1173 ;; for the face.  FACE should be a face name or face object.
1174 ;; FRAME is the frame to act on; it must be an actual frame, not nil or t.
1175 (defun face-fill-in (face data frame)
1176   (condition-case nil
1177       (let ((foreground (face-foreground data))
1178             (background (face-background data))
1179             (font (face-font data))
1180             (stipple (face-stipple data)))
1181         (set-face-underline-p face (face-underline-p data) frame)
1182         (if foreground
1183             (face-try-color-list 'set-face-foreground
1184                                  face foreground frame))
1185         (if background
1186             (face-try-color-list 'set-face-background
1187                                  face background frame))
1188         (if (listp font)
1189             (let ((bold (memq 'bold font))
1190                   (italic (memq 'italic font)))
1191               (cond ((and bold italic)
1192                      (make-face-bold-italic face frame))
1193                     (bold
1194                      (make-face-bold face frame))
1195                     (italic
1196                      (make-face-italic face frame))))
1197           (if font
1198               (set-face-font face font frame)))
1199         (if stipple
1200             (set-face-stipple face stipple frame)))
1201     (error nil)))
1202
1203 ;; Assuming COLOR is a valid color name,
1204 ;; return t if it can be displayed on FRAME.
1205 (defun face-color-supported-p (frame color background-p)
1206   (and window-system
1207        (or (x-display-color-p frame)
1208            ;; A black-and-white display can implement these.
1209            (member color '("black" "white"))
1210            ;; A black-and-white display can fake gray for background.
1211            (and background-p
1212                 (face-color-gray-p color frame))
1213            ;; A grayscale display can implement colors that are gray (more or less).
1214            (and (x-display-grayscale-p frame)
1215                 (face-color-gray-p color frame)))))
1216
1217 ;; Use FUNCTION to store a color in FACE on FRAME.
1218 ;; COLORS is either a single color or a list of colors.
1219 ;; If it is a list, try the colors one by one until one of them
1220 ;; succeeds.  We signal an error only if all the colors failed.
1221 ;; t as COLORS or as an element of COLORS means to invert the face.
1222 ;; That can't fail, so any subsequent elements after the t are ignored.
1223 (defun face-try-color-list (function face colors frame)
1224   (if (stringp colors)
1225       (if (face-color-supported-p frame colors
1226                                   (eq function 'set-face-background))
1227           (funcall function face colors frame))
1228     (if (eq colors t)
1229         (invert-face face frame)
1230       (let (done)
1231         (while (and colors (not done))
1232           (if (or (memq (car colors) '(t underline))
1233                   (face-color-supported-p frame (car colors)
1234                                           (eq function 'set-face-background)))
1235               (if (cdr colors)
1236                   ;; If there are more colors to try, catch errors
1237                   ;; and set `done' if we succeed.
1238                   (condition-case nil
1239                       (progn
1240                         (cond ((eq (car colors) t)
1241                                (invert-face face frame))
1242                               ((eq (car colors) 'underline)
1243                                (set-face-underline-p face t frame))
1244                               (t
1245                                (funcall function face (car colors) frame)))
1246                         (setq done t))
1247                     (error nil))
1248                 ;; If this is the last color, let the error get out if it fails.
1249                 ;; If it succeeds, we will exit anyway after this iteration.
1250                 (cond ((eq (car colors) t)
1251                        (invert-face face frame))
1252                       ((eq (car colors) 'underline)
1253                        (set-face-underline-p face t frame))
1254                       (t
1255                        (funcall function face (car colors) frame)))))
1256           (setq colors (cdr colors)))))))
1257
1258 ;; If we are already using x-window frames, initialize faces for them.
1259 (if (or (eq (framep (selected-frame)) 'x) (eq (framep (selected-frame)) 'win32))
1260     (face-initialize))
1261
1262 (provide 'faces)
1263
1264 ;;; faces.el ends here