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)
 120       (setq font (or (query-fontset font)
 121                      (x-resolve-font-name font 'default frame))))
 122   (internal-set-face-1 face 'font font 3 frame))
 123
 124 (defun set-face-foreground (face color &optional frame)
 125   "Change the foreground color of face FACE to COLOR (a string).
 126 If the optional FRAME argument is provided, change only
 127 in that frame; otherwise change each frame."
 128   (interactive (internal-face-interactive "foreground"))
 129   (internal-set-face-1 face 'foreground color 4 frame))
 130
 131 (defvar face-default-stipple "gray3"
 132   "Default stipple pattern used on monochrome displays.
 133 This stipple pattern is used on monochrome displays
 134 instead of shades of gray for a face background color.
 135 See `set-face-stipple' for possible values for this variable.")
 136
 137 (defun face-color-gray-p (color &optional frame)
 138   "Return t if COLOR is a shade of gray (or white or black).
 139 FRAME specifies the frame and thus the display for interpreting COLOR."
 140   (let* ((values (x-color-values color frame))
 141          (r (nth 0 values))
 142          (g (nth 1 values))
 143          (b (nth 2 values)))
 144     (and values
 145          (< (abs (- r g)) (/ (max 1 (abs r) (abs g)) 20))
 146          (< (abs (- g b)) (/ (max 1 (abs g) (abs b)) 20))
 147          (< (abs (- b r)) (/ (max 1 (abs b) (abs r)) 20)))))
 148
 149 (defun set-face-background (face color &optional frame)
 150   "Change the background color of face FACE to COLOR (a string).
 151 If the optional FRAME argument is provided, change only
 152 in that frame; otherwise change each frame."
 153   (interactive (internal-face-interactive "background"))
 154   ;; For a specific frame, use gray stipple instead of gray color
 155   ;; if the display does not support a gray color.
 156   (if (and frame (not (eq frame t)) color
 157            ;; Check for support for foreground, not for background!
 158            ;; face-color-supported-p is smart enough to know
 159            ;; that grays are "supported" as background
 160            ;; because we are supposed to use stipple for them!
 161            (not (face-color-supported-p frame color nil)))
 162       (set-face-stipple face face-default-stipple frame)
 163     (if (null frame)
 164         (let ((frames (frame-list)))
 165           (while frames
 166             (set-face-background (face-name face) color (car frames))
 167             (setq frames (cdr frames)))
 168           (set-face-background face color t)
 169           color)
 170       (internal-set-face-1 face 'background color 5 frame))))
 171
 172 (defun set-face-stipple (face pixmap &optional frame)
 173   "Change the stipple pixmap of face FACE to PIXMAP.
 174 PIXMAP should be a string, the name of a file of pixmap data.
 175 The directories listed in the `x-bitmap-file-path' variable are searched.
 176
 177 Alternatively, PIXMAP may be a list of the form (WIDTH HEIGHT DATA)
 178 where WIDTH and HEIGHT are the size in pixels,
 179 and DATA is a string, containing the raw bits of the bitmap.
 180
 181 If the optional FRAME argument is provided, change only
 182 in that frame; otherwise change each frame."
 183   (interactive (internal-face-interactive-stipple "stipple"))
 184   (internal-set-face-1 face 'background-pixmap pixmap 6 frame))
 185
 186 (defalias 'set-face-background-pixmap 'set-face-stipple)
 187
 188 (defun set-face-underline-p (face underline-p &optional frame)
 189   "Specify whether face FACE is underlined.  (Yes if UNDERLINE-P is non-nil.)
 190 If the optional FRAME argument is provided, change only
 191 in that frame; otherwise change each frame."
 192   (interactive (internal-face-interactive "underline-p" "underlined"))
 193   (internal-set-face-1 face 'underline underline-p 7 frame))
 194 \f
 195 (defun modify-face-read-string (face default name alist)
 196   (let ((value
 197          (completing-read
 198           (if default
 199               (format "Set face %s %s (default %s): "
 200                       face name (downcase default))
 201             (format "Set face %s %s: " face name))
 202           alist)))
 203     (cond ((equal value "none")
 204            nil)
 205           ((equal value "")
 206            default)
 207           (t value))))
 208
 209 (defun modify-face (face foreground background stipple
 210                     bold-p italic-p underline-p &optional frame)
 211   "Change the display attributes for face FACE.
 212 If the optional FRAME argument is provided, change only
 213 in that frame; otherwise change each frame.
 214
 215 FOREGROUND and BACKGROUND should be a colour name string (or list of strings to
 216 try) or nil.  STIPPLE should be a stipple pattern name string or nil.
 217 If nil, means do not change the display attribute corresponding to that arg.
 218
 219 BOLD-P, ITALIC-P, and UNDERLINE-P specify whether the face should be set bold,
 220 in italic, and underlined, respectively.  If neither nil or t, means do not
 221 change the display attribute corresponding to that arg.
 222
 223 If called interactively, prompts for a face name and face attributes."
 224   (interactive
 225    (let* ((completion-ignore-case t)
 226           (face         (symbol-name (read-face-name "Modify face: ")))
 227           (colors       (mapcar 'list x-colors))
 228           (stipples     (mapcar 'list (apply 'nconc
 229                                             (mapcar 'directory-files
 230                                                     x-bitmap-file-path))))
 231           (foreground   (modify-face-read-string
 232                          face (face-foreground (intern face))
 233                          "foreground" colors))
 234           (background   (modify-face-read-string
 235                          face (face-background (intern face))
 236                          "background" colors))
 237           ;; If the stipple value is a list (WIDTH HEIGHT DATA),
 238           ;; represent that as a string by printing it out.
 239           (old-stipple-string
 240            (if (stringp (face-stipple (intern face)))
 241                (face-stipple (intern face))
 242              (if (face-stipple (intern face))
 243                  (prin1-to-string (face-stipple (intern face))))))
 244           (new-stipple-string
 245            (modify-face-read-string
 246             face old-stipple-string
 247             "stipple" stipples))
 248           ;; Convert the stipple value text we read
 249           ;; back to a list if it looks like one.
 250           ;; This makes the assumption that a pixmap file name
 251           ;; won't start with an open-paren.
 252           (stipple
 253            (and new-stipple-string
 254                 (if (string-match "^(" new-stipple-string)
 255                     (read new-stipple-string)
 256                   new-stipple-string)))
 257           (bold-p       (y-or-n-p (concat "Should face " face " be bold ")))
 258           (italic-p     (y-or-n-p (concat "Should face " face " be italic ")))
 259           (underline-p  (y-or-n-p (concat "Should face " face " be underlined ")))
 260           (all-frames-p (y-or-n-p (concat "Modify face " face " in all frames "))))
 261      (message "Face %s: %s" face
 262       (mapconcat 'identity
 263        (delq nil
 264         (list (and foreground (concat (downcase foreground) " foreground"))
 265               (and background (concat (downcase background) " background"))
 266               (and stipple (concat (downcase new-stipple-string) " stipple"))
 267               (and bold-p "bold") (and italic-p "italic")
 268               (and underline-p "underline"))) ", "))
 269      (list (intern face) foreground background stipple
 270            bold-p italic-p underline-p
 271            (if all-frames-p nil (selected-frame)))))
 272   (condition-case nil
 273       (face-try-color-list 'set-face-foreground face foreground frame)
 274     (error nil))
 275   (condition-case nil
 276       (face-try-color-list 'set-face-background face background frame)
 277     (error nil))
 278   (condition-case nil
 279       (set-face-stipple face stipple frame)
 280     (error nil))
 281   (cond ((eq bold-p nil) (make-face-unbold face frame t))
 282         ((eq bold-p t) (make-face-bold face frame t)))
 283   (cond ((eq italic-p nil) (make-face-unitalic face frame t))
 284         ((eq italic-p t) (make-face-italic face frame t)))
 285   (if (memq underline-p '(nil t))
 286       (set-face-underline-p face underline-p frame))
 287   (and (interactive-p) (redraw-display)))
 288 \f
 289 ;;;; Associating face names (symbols) with their face vectors.
 290
 291 (defvar global-face-data nil
 292   "Internal data for face support functions.  Not for external use.
 293 This is an alist associating face names with the default values for
 294 their parameters.  Newly created frames get their data from here.")
 295
 296 (defun face-list ()
 297   "Returns a list of all defined face names."
 298   (mapcar 'car global-face-data))
 299
 300 (defun internal-find-face (name &optional frame)
 301   "Retrieve the face named NAME.  Return nil if there is no such face.
 302 If the optional argument FRAME is given, this gets the face NAME for
 303 that frame; otherwise, it uses the selected frame.
 304 If FRAME is the symbol t, then the global, non-frame face is returned.
 305 If NAME is already a face, it is simply returned."
 306   (if (and (eq frame t) (not (symbolp name)))
 307       (setq name (face-name name)))
 308   (if (symbolp name)
 309       (cdr (assq name
 310                  (if (eq frame t)
 311                      global-face-data
 312                    (frame-face-alist (or frame (selected-frame))))))
 313     (internal-check-face name)
 314     name))
 315
 316 (defun internal-get-face (name &optional frame)
 317   "Retrieve the face named NAME; error if there is none.
 318 If the optional argument FRAME is given, this gets the face NAME for
 319 that frame; otherwise, it uses the selected frame.
 320 If FRAME is the symbol t, then the global, non-frame face is returned.
 321 If NAME is already a face, it is simply returned."
 322   (or (internal-find-face name frame)
 323       (internal-check-face name)))
 324
 325
 326 (defun internal-set-face-1 (face name value index frame)
 327   (let ((inhibit-quit t))
 328     (if (null frame)
 329         (let ((frames (frame-list)))
 330           (while frames
 331             (internal-set-face-1 (face-name face) name value index (car frames))
 332             (setq frames (cdr frames)))
 333           (aset (internal-get-face (if (symbolp face) face (face-name face)) t)
 334                 index value)
 335           value)
 336       (or (eq frame t)
 337           (set-face-attribute-internal (face-id face) name value frame))
 338       (aset (internal-get-face face frame) index value))))
 339
 340
 341 (defun read-face-name (prompt)
 342   (let (face)
 343     (while (= (length face) 0)
 344       (setq face (completing-read prompt
 345                                   (mapcar '(lambda (x) (list (symbol-name x)))
 346                                           (face-list))
 347                                   nil t)))
 348     (intern face)))
 349
 350 (defun internal-face-interactive (what &optional bool)
 351   (let* ((fn (intern (concat "face-" what)))
 352          (prompt (concat "Set " what " of face"))
 353          (face (read-face-name (concat prompt ": ")))
 354          (default (if (fboundp fn)
 355                       (or (funcall fn face (selected-frame))
 356                           (funcall fn 'default (selected-frame)))))
 357          (value (if bool
 358                     (y-or-n-p (concat "Should face " (symbol-name face)
 359                                       " be " bool "? "))
 360                   (read-string (concat prompt " " (symbol-name face) " to: ")
 361                                default))))
 362     (list face (if (equal value "") nil value))))
 363
 364 (defun internal-face-interactive-stipple (what)
 365   (let* ((fn (intern (concat "face-" what)))
 366          (prompt (concat "Set " what " of face"))
 367          (face (read-face-name (concat prompt ": ")))
 368          (default (if (fboundp fn)
 369                       (or (funcall fn face (selected-frame))
 370                           (funcall fn 'default (selected-frame)))))
 371          ;; If the stipple value is a list (WIDTH HEIGHT DATA),
 372          ;; represent that as a string by printing it out.
 373          (old-stipple-string
 374           (if (stringp (face-stipple face))
 375               (face-stipple face)
 376             (if (null (face-stipple face))
 377                 nil
 378               (prin1-to-string (face-stipple face)))))
 379          (new-stipple-string
 380           (read-string
 381            (concat prompt " " (symbol-name face) " to: ")
 382            old-stipple-string))
 383          ;; Convert the stipple value text we read
 384          ;; back to a list if it looks like one.
 385          ;; This makes the assumption that a pixmap file name
 386          ;; won't start with an open-paren.
 387          (stipple
 388           (if (string-match "^(" new-stipple-string)
 389               (read new-stipple-string)
 390             new-stipple-string)))
 391     (list face (if (equal stipple "") nil stipple))))
 392
 393 (defun make-face (name &optional no-resources)
 394   "Define a new FACE on all frames.
 395 You can modify the font, color, etc of this face with the set-face- functions.
 396 If NO-RESOURCES is non-nil, then we ignore X resources
 397 and always make a face whose attributes are all nil.
 398
 399 If the face already exists, it is unmodified."
 400   (interactive "SMake face: ")
 401   (or (internal-find-face name)
 402       (let ((face (make-vector 8 nil)))
 403         (aset face 0 'face)
 404         (aset face 1 name)
 405         (let* ((frames (frame-list))
 406                (inhibit-quit t)
 407                (id (internal-next-face-id)))
 408           (make-face-internal id)
 409           (aset face 2 id)
 410           (while frames
 411             (set-frame-face-alist (car frames)
 412                                   (cons (cons name (copy-sequence face))
 413                                         (frame-face-alist (car frames))))
 414             (setq frames (cdr frames)))
 415           (setq global-face-data (cons (cons name face) global-face-data)))
 416         ;; When making a face after frames already exist
 417         (or no-resources
 418             (if (memq window-system '(x w32))
 419                 (make-face-x-resource-internal face)))
 420         ;; Add to menu of faces.
 421         (if (fboundp 'facemenu-add-new-face)
 422             (facemenu-add-new-face name))
 423         face))
 424   name)
 425
 426 (defun make-empty-face (face)
 427   "Define a new FACE on all frames, which initially reflects the defaults.
 428 You can modify the font, color, etc of this face with the set-face- functions.
 429 If the face already exists, it is unmodified."
 430   (interactive "SMake empty face: ")
 431   (make-face face t))
 432
 433 ;; Fill in a face by default based on X resources, for all existing frames.
 434 ;; This has to be done when a new face is made.
 435 (defun make-face-x-resource-internal (face &optional frame set-anyway)
 436   (cond ((null frame)
 437          (let ((frames (frame-list)))
 438            (while frames
 439              (if (memq (framep (car frames)) '(x w32))
 440                  (make-face-x-resource-internal (face-name face)
 441                                                 (car frames) set-anyway))
 442              (setq frames (cdr frames)))))
 443         (t
 444          (setq face (internal-get-face (face-name face) frame))
 445          ;;
 446          ;; These are things like "attributeForeground" instead of simply
 447          ;; "foreground" because people tend to do things like "*foreground",
 448          ;; which would cause all faces to be fully qualified, making faces
 449          ;; inherit attributes in a non-useful way.  So we've made them slightly
 450          ;; less obvious to specify in order to make them work correctly in
 451          ;; more random environments.
 452          ;;
 453          ;; I think these should be called "face.faceForeground" instead of
 454          ;; "face.attributeForeground", but they're the way they are for
 455          ;; hysterical reasons.
 456          ;;
 457          (let* ((name (symbol-name (face-name face)))
 458                 (fn  (or (x-get-resource (concat name ".attributeFont")
 459                                          "Face.AttributeFont")
 460                          (and set-anyway (face-font face))))
 461                 (fg  (or (x-get-resource (concat name ".attributeForeground")
 462                                          "Face.AttributeForeground")
 463                          (and set-anyway (face-foreground face))))
 464                 (bg  (or (x-get-resource (concat name ".attributeBackground")
 465                                          "Face.AttributeBackground")
 466                          (and set-anyway (face-background face))))
 467                 (bgp (or (x-get-resource (concat name ".attributeStipple")
 468                                          "Face.AttributeStipple")
 469                          (x-get-resource (concat name ".attributeBackgroundPixmap")
 470                                          "Face.AttributeBackgroundPixmap")
 471                          (and set-anyway (face-stipple face))))
 472                 (ulp (let ((resource (x-get-resource
 473                                       (concat name ".attributeUnderline")
 474                                       "Face.AttributeUnderline")))
 475                        (if resource
 476                            (member (downcase resource) '("on" "true"))
 477                          (and set-anyway (face-underline-p face)))))
 478                 )
 479            (if fn
 480                (condition-case ()
 481                    (cond ((string= fn "italic")
 482                           (make-face-italic face))
 483                          ((string= fn "bold")
 484                           (make-face-bold face))
 485                          ((string= fn "bold-italic")
 486                           (make-face-bold-italic face))
 487                          (t
 488                           (set-face-font face fn frame)))
 489                  (error
 490                   (if (member fn '("italic" "bold" "bold-italic"))
 491                       (message "no %s version found for face `%s'" fn name)
 492                     (message "font `%s' not found for face `%s'" fn name)))))
 493            (if fg
 494                (condition-case ()
 495                    (set-face-foreground face fg frame)
 496                  (error (message "color `%s' not allocated for face `%s'" fg name))))
 497            (if bg
 498                (condition-case ()
 499                    (set-face-background face bg frame)
 500                  (error (message "color `%s' not allocated for face `%s'" bg name))))
 501            (if bgp
 502                (condition-case ()
 503                    (set-face-stipple face bgp frame)
 504                  (error (message "pixmap `%s' not found for face `%s'" bgp name))))
 505            (if (or ulp set-anyway)
 506                (set-face-underline-p face ulp frame))
 507            )))
 508   face)
 509
 510 (defun copy-face (old-face new-face &optional frame new-frame)
 511   "Define a face just like OLD-FACE, with name NEW-FACE.
 512 If NEW-FACE already exists as a face, it is modified to be like OLD-FACE.
 513 If it doesn't already exist, it is created.
 514
 515 If the optional argument FRAME is given as a frame,
 516 NEW-FACE is changed on FRAME only.
 517 If FRAME is t, the frame-independent default specification for OLD-FACE
 518 is copied to NEW-FACE.
 519 If FRAME is nil, copying is done for the frame-independent defaults
 520 and for each existing frame.
 521 If the optional fourth argument NEW-FRAME is given,
 522 copy the information from face OLD-FACE on frame FRAME
 523 to NEW-FACE on frame NEW-FRAME."
 524   (or new-frame (setq new-frame frame))
 525   (let ((inhibit-quit t))
 526     (if (null frame)
 527         (let ((frames (frame-list)))
 528           (while frames
 529             (copy-face old-face new-face (car frames))
 530             (setq frames (cdr frames)))
 531           (copy-face old-face new-face t))
 532       (setq old-face (internal-get-face old-face frame))
 533       (setq new-face (or (internal-find-face new-face new-frame)
 534                          (make-face new-face)))
 535       (condition-case nil
 536           ;; A face that has a global symbolic font modifier such as `bold'
 537           ;; might legitimately get an error here.
 538           ;; Use the frame's default font in that case.
 539           (set-face-font new-face (face-font old-face frame) new-frame)
 540         (error
 541          (set-face-font new-face nil new-frame)))
 542       (set-face-foreground new-face (face-foreground old-face frame) new-frame)
 543       (set-face-background new-face (face-background old-face frame) new-frame)
 544       (set-face-stipple new-face
 545                         (face-stipple old-face frame)
 546                         new-frame)
 547       (set-face-underline-p new-face (face-underline-p old-face frame)
 548                             new-frame))
 549     new-face))
 550
 551 (defun face-equal (face1 face2 &optional frame)
 552   "True if the faces FACE1 and FACE2 display in the same way."
 553   (setq face1 (internal-get-face face1 frame)
 554         face2 (internal-get-face face2 frame))
 555   (and (equal (face-foreground face1 frame) (face-foreground face2 frame))
 556        (equal (face-background face1 frame) (face-background face2 frame))
 557        (equal (face-font face1 frame) (face-font face2 frame))
 558        (eq (face-underline-p face1 frame) (face-underline-p face2 frame))
 559        (equal (face-stipple face1 frame)
 560               (face-stipple face2 frame))))
 561
 562 (defun face-differs-from-default-p (face &optional frame)
 563   "True if face FACE displays differently from the default face, on FRAME.
 564 A face is considered to be ``the same'' as the default face if it is
 565 actually specified in the same way (equivalent fonts, etc) or if it is
 566 fully unspecified, and thus inherits the attributes of any face it
 567 is displayed on top of.
 568
 569 The optional argument FRAME specifies which frame to test;
 570 if FRAME is t, test the default for new frames.
 571 If FRAME is nil or omitted, test the selected frame."
 572   (let ((default (internal-get-face 'default frame)))
 573     (setq face (internal-get-face face frame))
 574     (not (and (or (equal (face-foreground default frame)
 575                          (face-foreground face frame))
 576                   (null (face-foreground face frame)))
 577               (or (equal (face-background default frame)
 578                          (face-background face frame))
 579                   (null (face-background face frame)))
 580               (or (null (face-font face frame))
 581                   (equal (face-font face frame)
 582                          (or (face-font default frame)
 583                              (downcase
 584                               (cdr (assq 'font (frame-parameters frame)))))))
 585               (or (equal (face-stipple default frame)
 586                          (face-stipple face frame))
 587                   (null (face-stipple face frame)))
 588               (equal (face-underline-p default frame)
 589                      (face-underline-p face frame))
 590               ))))
 591
 592 (defun face-nontrivial-p (face &optional frame)
 593   "True if face FACE has some non-nil attribute.
 594 The optional argument FRAME specifies which frame to test;
 595 if FRAME is t, test the default for new frames.
 596 If FRAME is nil or omitted, test the selected frame."
 597   (setq face (internal-get-face face frame))
 598   (or (face-foreground face frame)
 599       (face-background face frame)
 600       (face-font face frame)
 601       (face-stipple face frame)
 602       (face-underline-p face frame)))
 603
 604
 605 (defun invert-face (face &optional frame)
 606   "Swap the foreground and background colors of face FACE.
 607 If the face doesn't specify both foreground and background, then
 608 set its foreground and background to the default background and foreground."
 609   (interactive (list (read-face-name "Invert face: ")))
 610   (setq face (internal-get-face face frame))
 611   (let ((fg (face-foreground face frame))
 612         (bg (face-background face frame)))
 613     (if (or fg bg)
 614         (progn
 615           (set-face-foreground face bg frame)
 616           (set-face-background face fg frame))
 617       (let* ((frame-bg (cdr (assq 'background-color (frame-parameters frame))))
 618              (default-bg (or (face-background 'default frame)
 619                              frame-bg))
 620              (frame-fg (cdr (assq 'foreground-color (frame-parameters frame))))
 621              (default-fg (or (face-foreground 'default frame)
 622                              frame-fg)))
 623         (set-face-foreground face default-bg frame)
 624         (set-face-background face default-fg frame))))
 625   face)
 626
 627
 628 (defun internal-try-face-font (face font &optional frame)
 629   "Like set-face-font, but returns nil on failure instead of an error."
 630   (condition-case ()
 631       (set-face-font face font frame)
 632     (error nil)))
 633 \f
 634 ;; Manipulating font names.
 635
 636 (defvar x-font-regexp nil)
 637 (defvar x-font-regexp-head nil)
 638 (defvar x-font-regexp-weight nil)
 639 (defvar x-font-regexp-slant nil)
 640
 641 (defconst x-font-regexp-weight-subnum 1)
 642 (defconst x-font-regexp-slant-subnum 2)
 643 (defconst x-font-regexp-swidth-subnum 3)
 644 (defconst x-font-regexp-adstyle-subnum 4)
 645
 646 ;;; Regexps matching font names in "Host Portable Character Representation."
 647 ;;;
 648 (let ((-                "[-?]")
 649       (foundry          "[^-]+")
 650       (family           "[^-]+")
 651       (weight           "\\(bold\\|demibold\\|medium\\)")               ; 1
 652 ;     (weight\?         "\\(\\*\\|bold\\|demibold\\|medium\\|\\)")      ; 1
 653       (weight\?         "\\([^-]*\\)")                                  ; 1
 654       (slant            "\\([ior]\\)")                                  ; 2
 655 ;     (slant\?          "\\([ior?*]?\\)")                               ; 2
 656       (slant\?          "\\([^-]?\\)")                                  ; 2
 657 ;     (swidth           "\\(\\*\\|normal\\|semicondensed\\|\\)")        ; 3
 658       (swidth           "\\([^-]*\\)")                                  ; 3
 659 ;     (adstyle          "\\(\\*\\|sans\\|\\)")                          ; 4
 660       (adstyle          "\\([^-]*\\)")                                  ; 4
 661       (pixelsize        "[0-9]+")
 662       (pointsize        "[0-9][0-9]+")
 663       (resx             "[0-9][0-9]+")
 664       (resy             "[0-9][0-9]+")
 665       (spacing          "[cmp?*]")
 666       (avgwidth         "[0-9]+")
 667       (registry         "[^-]+")
 668       (encoding         "[^-]+")
 669       )
 670   (setq x-font-regexp
 671         (concat "\\`\\*?[-?*]"
 672                 foundry - family - weight\? - slant\? - swidth - adstyle -
 673                 pixelsize - pointsize - resx - resy - spacing - avgwidth -
 674                 registry - encoding "\\*?\\'"
 675                 ))
 676   (setq x-font-regexp-head
 677         (concat "\\`[-?*]" foundry - family - weight\? - slant\?
 678                 "\\([-*?]\\|\\'\\)"))
 679   (setq x-font-regexp-slant (concat - slant -))
 680   (setq x-font-regexp-weight (concat - weight -))
 681   nil)
 682
 683 (defun x-resolve-font-name (pattern &optional face frame)
 684   "Return a font name matching PATTERN.
 685 All wildcards in PATTERN become substantiated.
 686 If PATTERN is nil, return the name of the frame's base font, which never
 687 contains wildcards.
 688 Given optional arguments FACE and FRAME, return a font which is
 689 also the same size as FACE on FRAME, or fail."
 690   (or (symbolp face)
 691       (setq face (face-name face)))
 692   (and (eq frame t)
 693        (setq frame nil))
 694   (if pattern
 695       ;; Note that x-list-fonts has code to handle a face with nil as its font.
 696       (let ((fonts (x-list-fonts pattern face frame 1)))
 697         (or fonts
 698             (if face
 699                 (if (string-match "\\*" pattern)
 700                     (if (null (face-font face))
 701                         (error "No matching fonts are the same height as the frame default font")
 702                       (error "No matching fonts are the same height as face `%s'" face))
 703                   (if (null (face-font face))
 704                       (error "Height of font `%s' doesn't match the frame default font"
 705                              pattern)
 706                     (error "Height of font `%s' doesn't match face `%s'"
 707                            pattern face)))
 708               (error "No fonts match `%s'" pattern)))
 709         (car fonts))
 710     (cdr (assq 'font (frame-parameters (selected-frame))))))
 711
 712 (defun x-frob-font-weight (font which)
 713   (let ((case-fold-search t))
 714     (cond ((string-match x-font-regexp font)
 715            (concat (substring font 0
 716                               (match-beginning x-font-regexp-weight-subnum))
 717                    which
 718                    (substring font (match-end x-font-regexp-weight-subnum)
 719                               (match-beginning x-font-regexp-adstyle-subnum))
 720                    ;; Replace the ADD_STYLE_NAME field with *
 721                    ;; because the info in it may not be the same
 722                    ;; for related fonts.
 723                    "*"
 724                    (substring font (match-end x-font-regexp-adstyle-subnum))))
 725           ((string-match x-font-regexp-head font)
 726            (concat (substring font 0 (match-beginning 1)) which
 727                    (substring font (match-end 1))))
 728           ((string-match x-font-regexp-weight font)
 729            (concat (substring font 0 (match-beginning 1)) which
 730                    (substring font (match-end 1)))))))
 731
 732 (defun x-frob-font-slant (font which)
 733   (let ((case-fold-search t))
 734     (cond ((string-match x-font-regexp font)
 735            (concat (substring font 0
 736                               (match-beginning x-font-regexp-slant-subnum))
 737                    which
 738                    (substring font (match-end x-font-regexp-slant-subnum)
 739                               (match-beginning x-font-regexp-adstyle-subnum))
 740                    ;; Replace the ADD_STYLE_NAME field with *
 741                    ;; because the info in it may not be the same
 742                    ;; for related fonts.
 743                    "*"
 744                    (substring font (match-end x-font-regexp-adstyle-subnum))))
 745           ((string-match x-font-regexp-head font)
 746            (concat (substring font 0 (match-beginning 2)) which
 747                    (substring font (match-end 2))))
 748           ((string-match x-font-regexp-slant font)
 749            (concat (substring font 0 (match-beginning 1)) which
 750                    (substring font (match-end 1)))))))
 751
 752 (defun x-make-font-bold (font)
 753   "Given an X font specification, make a bold version of it.
 754 If that can't be done, return nil."
 755   (x-frob-font-weight font "bold"))
 756
 757 (defun x-make-font-demibold (font)
 758   "Given an X font specification, make a demibold version of it.
 759 If that can't be done, return nil."
 760   (x-frob-font-weight font "demibold"))
 761
 762 (defun x-make-font-unbold (font)
 763   "Given an X font specification, make a non-bold version of it.
 764 If that can't be done, return nil."
 765   (x-frob-font-weight font "medium"))
 766
 767 (defun x-make-font-italic (font)
 768   "Given an X font specification, make an italic version of it.
 769 If that can't be done, return nil."
 770   (x-frob-font-slant font "i"))
 771
 772 (defun x-make-font-oblique (font) ; you say tomayto...
 773   "Given an X font specification, make an oblique version of it.
 774 If that can't be done, return nil."
 775   (x-frob-font-slant font "o"))
 776
 777 (defun x-make-font-unitalic (font)
 778   "Given an X font specification, make a non-italic version of it.
 779 If that can't be done, return nil."
 780   (x-frob-font-slant font "r"))
 781 \f
 782 ;;; non-X-specific interface
 783
 784 (defun make-face-bold (face &optional frame noerror)
 785   "Make the font of the given face be bold, if possible.
 786 If NOERROR is non-nil, return nil on failure."
 787   (interactive (list (read-face-name "Make which face bold: ")))
 788   (if (and (eq frame t) (listp (face-font face t)))
 789       (set-face-font face (if (memq 'italic (face-font face t))
 790                               '(bold italic) '(bold))
 791                      t)
 792     (let (font)
 793       (if (null frame)
 794           (let ((frames (frame-list)))
 795             ;; Make this face bold in global-face-data.
 796             (make-face-bold face t noerror)
 797             ;; Make this face bold in each frame.
 798             (while frames
 799               (make-face-bold face (car frames) noerror)
 800               (setq frames (cdr frames))))
 801         (setq face (internal-get-face face frame))
 802         (setq font (or (face-font face frame)
 803                        (face-font face t)))
 804         (if (listp font)
 805             (setq font nil))
 806         (setq font (or font
 807                        (face-font 'default frame)
 808                        (cdr (assq 'font (frame-parameters frame)))))
 809         (or (and font (make-face-bold-internal face frame font))
 810             ;; We failed to find a bold version of the font.
 811             noerror
 812             (error "No bold version of %S" font))))))
 813
 814 (defun make-face-bold-internal (face frame font)
 815   (let (f2)
 816     (or (and (setq f2 (x-make-font-bold font))
 817              (internal-try-face-font face f2 frame))
 818         (and (setq f2 (x-make-font-demibold font))
 819              (internal-try-face-font face f2 frame)))))
 820
 821 (defun make-face-italic (face &optional frame noerror)
 822   "Make the font of the given face be italic, if possible.
 823 If NOERROR is non-nil, return nil on failure."
 824   (interactive (list (read-face-name "Make which face italic: ")))
 825   (if (and (eq frame t) (listp (face-font face t)))
 826       (set-face-font face (if (memq 'bold (face-font face t))
 827                               '(bold italic) '(italic))
 828                      t)
 829     (let (font)
 830       (if (null frame)
 831           (let ((frames (frame-list)))
 832             ;; Make this face italic in global-face-data.
 833             (make-face-italic face t noerror)
 834             ;; Make this face italic in each frame.
 835             (while frames
 836               (make-face-italic face (car frames) noerror)
 837               (setq frames (cdr frames))))
 838         (setq face (internal-get-face face frame))
 839         (setq font (or (face-font face frame)
 840                        (face-font face t)))
 841         (if (listp font)
 842             (setq font nil))
 843         (setq font (or font
 844                        (face-font 'default frame)
 845                        (cdr (assq 'font (frame-parameters frame)))))
 846         (or (and font (make-face-italic-internal face frame font))
 847             ;; We failed to find an italic version of the font.
 848             noerror
 849             (error "No italic version of %S" font))))))
 850
 851 (defun make-face-italic-internal (face frame font)
 852   (let (f2)
 853     (or (and (setq f2 (x-make-font-italic font))
 854              (internal-try-face-font face f2 frame))
 855         (and (setq f2 (x-make-font-oblique font))
 856              (internal-try-face-font face f2 frame)))))
 857
 858 (defun make-face-bold-italic (face &optional frame noerror)
 859   "Make the font of the given face be bold and italic, if possible.
 860 If NOERROR is non-nil, return nil on failure."
 861   (interactive (list (read-face-name "Make which face bold-italic: ")))
 862   (if (and (eq frame t) (listp (face-font face t)))
 863       (set-face-font face '(bold italic) t)
 864     (let (font)
 865       (if (null frame)
 866           (let ((frames (frame-list)))
 867             ;; Make this face bold-italic in global-face-data.
 868             (make-face-bold-italic face t noerror)
 869             ;; Make this face bold in each frame.
 870             (while frames
 871               (make-face-bold-italic face (car frames) noerror)
 872               (setq frames (cdr frames))))
 873         (setq face (internal-get-face face frame))
 874         (setq font (or (face-font face frame)
 875                        (face-font face t)))
 876         (if (listp font)
 877             (setq font nil))
 878         (setq font (or font
 879                        (face-font 'default frame)
 880                        (cdr (assq 'font (frame-parameters frame)))))
 881         (or (and font (make-face-bold-italic-internal face frame font))
 882             ;; We failed to find a bold italic version.
 883             noerror
 884             (error "No bold italic version of %S" font))))))
 885
 886 (defun make-face-bold-italic-internal (face frame font)
 887   (let (f2 f3)
 888     (or (and (setq f2 (x-make-font-italic font))
 889              (not (equal font f2))
 890              (setq f3 (x-make-font-bold f2))
 891              (not (equal f2 f3))
 892              (internal-try-face-font face f3 frame))
 893         (and (setq f2 (x-make-font-oblique font))
 894              (not (equal font f2))
 895              (setq f3 (x-make-font-bold f2))
 896              (not (equal f2 f3))
 897              (internal-try-face-font face f3 frame))
 898         (and (setq f2 (x-make-font-italic font))
 899              (not (equal font f2))
 900              (setq f3 (x-make-font-demibold f2))
 901              (not (equal f2 f3))
 902              (internal-try-face-font face f3 frame))
 903         (and (setq f2 (x-make-font-oblique font))
 904              (not (equal font f2))
 905              (setq f3 (x-make-font-demibold f2))
 906              (not (equal f2 f3))
 907              (internal-try-face-font face f3 frame)))))
 908
 909 (defun make-face-unbold (face &optional frame noerror)
 910   "Make the font of the given face be non-bold, if possible.
 911 If NOERROR is non-nil, return nil on failure."
 912   (interactive (list (read-face-name "Make which face non-bold: ")))
 913   (if (and (eq frame t) (listp (face-font face t)))
 914       (set-face-font face (if (memq 'italic (face-font face t))
 915                               '(italic) nil)
 916                      t)
 917     (let (font font1)
 918       (if (null frame)
 919           (let ((frames (frame-list)))
 920             ;; Make this face unbold in global-face-data.
 921             (make-face-unbold face t noerror)
 922             ;; Make this face unbold in each frame.
 923             (while frames
 924               (make-face-unbold face (car frames) noerror)
 925               (setq frames (cdr frames))))
 926         (setq face (internal-get-face face frame))
 927         (setq font1 (or (face-font face frame)
 928                         (face-font face t)))
 929         (if (listp font1)
 930             (setq font1 nil))
 931         (setq font1 (or font1
 932                         (face-font 'default frame)
 933                         (cdr (assq 'font (frame-parameters frame)))))
 934         (setq font (and font1 (x-make-font-unbold font1)))
 935         (or (if font (internal-try-face-font face font frame))
 936             noerror
 937             (error "No unbold version of %S" font1))))))
 938
 939 (defun make-face-unitalic (face &optional frame noerror)
 940   "Make the font of the given face be non-italic, if possible.
 941 If NOERROR is non-nil, return nil on failure."
 942   (interactive (list (read-face-name "Make which face non-italic: ")))
 943   (if (and (eq frame t) (listp (face-font face t)))
 944       (set-face-font face (if (memq 'bold (face-font face t))
 945                               '(bold) nil)
 946                      t)
 947     (let (font font1)
 948       (if (null frame)
 949           (let ((frames (frame-list)))
 950             ;; Make this face unitalic in global-face-data.
 951             (make-face-unitalic face t noerror)
 952             ;; Make this face unitalic in each frame.
 953             (while frames
 954               (make-face-unitalic face (car frames) noerror)
 955               (setq frames (cdr frames))))
 956         (setq face (internal-get-face face frame))
 957         (setq font1 (or (face-font face frame)
 958                         (face-font face t)))
 959         (if (listp font1)
 960             (setq font1 nil))
 961         (setq font1 (or font1
 962                         (face-font 'default frame)
 963                         (cdr (assq 'font (frame-parameters frame)))))
 964         (setq font (and font1 (x-make-font-unitalic font1)))
 965         (or (if font (internal-try-face-font face font frame))
 966             noerror
 967             (error "No unitalic version of %S" font1))))))
 968 \f
 969 (defvar list-faces-sample-text
 970   "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 971   "*Text string to display as the sample text for `list-faces-display'.")
 972
 973 ;; The name list-faces would be more consistent, but let's avoid a conflict
 974 ;; with Lucid, which uses that name differently.
 975 (defun list-faces-display ()
 976   "List all faces, using the same sample text in each.
 977 The sample text is a string that comes from the variable
 978 `list-faces-sample-text'.
 979
 980 It is possible to give a particular face name different appearances in
 981 different frames.  This command shows the appearance in the
 982 selected frame."
 983   (interactive)
 984   (let ((faces (sort (face-list) (function string-lessp)))
 985         (face nil)
 986         (frame (selected-frame))
 987         disp-frame window)
 988     (with-output-to-temp-buffer "*Faces*"
 989       (save-excursion
 990         (set-buffer standard-output)
 991         (setq truncate-lines t)
 992         (while faces
 993           (setq face (car faces))
 994           (setq faces (cdr faces))
 995           (insert (format "%25s " (symbol-name face)))
 996           (let ((beg (point)))
 997             (insert list-faces-sample-text)
 998             (insert "\n")
 999             (put-text-property beg (1- (point)) 'face face)
1000             ;; If the sample text has multiple lines, line up all of them.
1001             (goto-char beg)
1002             (forward-line 1)
1003             (while (not (eobp))
1004               (insert "                          ")
1005               (forward-line 1))))
1006         (goto-char (point-min))))
1007     ;; If the *Faces* buffer appears in a different frame,
1008     ;; copy all the face definitions from FRAME,
1009     ;; so that the display will reflect the frame that was selected.
1010     (setq window (get-buffer-window (get-buffer "*Faces*") t))
1011     (setq disp-frame (if window (window-frame window)
1012                        (car (frame-list))))
1013     (or (eq frame disp-frame)
1014         (let ((faces (face-list)))
1015           (while faces
1016             (copy-face (car faces) (car faces) frame disp-frame)
1017             (setq faces (cdr faces)))))))
1018
1019 (defun describe-face (face)
1020   "Display the properties of face FACE."
1021   (interactive (list (read-face-name "Describe face: ")))
1022   (with-output-to-temp-buffer "*Help*"
1023     (princ "Properties of face `")
1024     (princ (face-name face))
1025     (princ "':") (terpri)
1026     (princ "Foreground: ") (princ (face-foreground face)) (terpri)
1027     (princ "Background: ") (princ (face-background face)) (terpri)
1028     (princ "      Font: ") (princ (face-font face)) (terpri)
1029     (princ "Underlined: ") (princ (if (face-underline-p face) "yes" "no")) (terpri)
1030     (princ "   Stipple: ") (princ (or (face-stipple face) "none"))))
1031 \f
1032 ;;; Make the standard faces.
1033 ;;; The C code knows the default and modeline faces as faces 0 and 1,
1034 ;;; so they must be the first two faces made.
1035 (defun face-initialize ()
1036   (make-face 'default)
1037   (make-face 'modeline)
1038   (make-face 'highlight)
1039
1040   ;; These aren't really special in any way, but they're nice to have around.
1041
1042   (make-face 'bold)
1043   (make-face 'italic)
1044   (make-face 'bold-italic)
1045   (make-face 'region)
1046   (make-face 'secondary-selection)
1047   (make-face 'underline)
1048
1049   (setq region-face (face-id 'region))
1050
1051   ;; Specify the global properties of these faces
1052   ;; so they will come out right on new frames.
1053
1054   (make-face-bold 'bold t)
1055   (make-face-italic 'italic t)
1056   (make-face-bold-italic 'bold-italic t)
1057
1058   (set-face-background 'highlight '("darkseagreen2" "green" t) t)
1059   (set-face-background 'region '("gray" underline) t)
1060   (set-face-background 'secondary-selection '("paleturquoise" "green" t) t)
1061   (set-face-background 'modeline '(t) t)
1062   (set-face-underline-p 'underline t t)
1063
1064   ;; Set up the faces of all existing X Window frames
1065   ;; from those global properties, unless already set in a given frame.
1066
1067   (let ((frames (frame-list)))
1068     (while frames
1069       (if (not (memq (framep (car frames)) '(t nil)))
1070           (let ((frame (car frames))
1071                 (rest global-face-data))
1072             (while rest
1073               (let ((face (car (car rest))))
1074                 (or (face-differs-from-default-p face)
1075                     (face-fill-in face (cdr (car rest)) frame)))
1076               (setq rest (cdr rest)))))
1077       (setq frames (cdr frames)))))
1078
1079 \f
1080 ;; Like x-create-frame but also set up the faces.
1081
1082 (defun x-create-frame-with-faces (&optional parameters)
1083   ;; Read this frame's geometry resource, if it has an explicit name,
1084   ;; and put the specs into PARAMETERS.
1085   (let* ((name (or (cdr (assq 'name parameters))
1086                    (cdr (assq 'name default-frame-alist))))
1087          (x-resource-name name)
1088          (res-geometry (if name (x-get-resource "geometry" "Geometry"))))
1089     (if res-geometry
1090         (let ((parsed (x-parse-geometry res-geometry)))
1091           ;; If the resource specifies a position,
1092           ;; call the position and size "user-specified".
1093           (if (or (assq 'top parsed) (assq 'left parsed))
1094               (setq parsed (append '((user-position . t) (user-size . t))
1095                                    parsed)))
1096           ;; Put the geometry parameters at the end.
1097           ;; Copy default-frame-alist so that they go after it.
1098           (setq parameters (append parameters default-frame-alist parsed)))))
1099   (let (frame)
1100     (if (null global-face-data)
1101         (setq frame (x-create-frame parameters))
1102       (let* ((visibility-spec (assq 'visibility parameters))
1103              (faces (copy-alist global-face-data))
1104              success
1105              (rest faces))
1106         (setq frame (x-create-frame (cons '(visibility . nil) parameters)))
1107         (unwind-protect
1108             (progn
1109               (set-frame-face-alist frame faces)
1110
1111               (if (cdr (or (assq 'reverse parameters)
1112                            (assq 'reverse default-frame-alist)
1113                            (let ((resource (x-get-resource "reverseVideo"
1114                                                            "ReverseVideo")))
1115                              (if resource
1116                                  (cons nil (member (downcase resource)
1117                                                    '("on" "true")))))))
1118                   (let* ((params (frame-parameters frame))
1119                          (bg (cdr (assq 'foreground-color params)))
1120                          (fg (cdr (assq 'background-color params))))
1121                     (modify-frame-parameters frame
1122                                              (list (cons 'foreground-color fg)
1123                                                    (cons 'background-color bg)))
1124                     (if (equal bg (cdr (assq 'border-color params)))
1125                         (modify-frame-parameters frame
1126                                                  (list (cons 'border-color fg))))
1127                     (if (equal bg (cdr (assq 'mouse-color params)))
1128                         (modify-frame-parameters frame
1129                                                  (list (cons 'mouse-color fg))))
1130                     (if (equal bg (cdr (assq 'cursor-color params)))
1131                         (modify-frame-parameters frame
1132                                                  (list (cons 'cursor-color fg))))))
1133               ;; Copy the vectors that represent the faces.
1134               ;; Also fill them in from X resources.
1135               (while rest
1136                 (let ((global (cdr (car rest))))
1137                   (setcdr (car rest) (vector 'face
1138                                              (face-name (cdr (car rest)))
1139                                              (face-id (cdr (car rest)))
1140                                              nil nil nil nil nil))
1141                   (face-fill-in (car (car rest)) global frame))
1142                 (make-face-x-resource-internal (cdr (car rest)) frame t)
1143                 (setq rest (cdr rest)))
1144               (if (null visibility-spec)
1145                   (make-frame-visible frame)
1146                 (modify-frame-parameters frame (list visibility-spec)))
1147               (setq success t))
1148           (or success
1149               (delete-frame frame)))))
1150     ;; Set up the background-mode frame parameter
1151     ;; so that programs can decide good ways of highlighting
1152     ;; on this frame.
1153     (let ((bg-resource (x-get-resource ".backgroundMode"
1154                                        "BackgroundMode"))
1155           (params (frame-parameters frame))
1156           (bg-mode))
1157       (setq bg-mode
1158             (cond (bg-resource (intern (downcase bg-resource)))
1159                   ((< (apply '+ (x-color-values
1160                                  (cdr (assq 'background-color params))
1161                                  frame))
1162                       ;; Just looking at the screen,
1163                       ;; colors whose values add up to .6 of the white total
1164                       ;; still look dark to me.
1165                       (* (apply '+ (x-color-values "white" frame)) .6))
1166                    'dark)
1167                   (t 'light)))
1168       (modify-frame-parameters frame
1169                                (list (cons 'background-mode bg-mode)
1170                                      (cons 'display-type
1171                                            (cond ((x-display-color-p frame)
1172                                                   'color)
1173                                                  ((x-display-grayscale-p frame)
1174                                                   'grayscale)
1175                                                  (t 'mono))))))
1176     frame))
1177
1178 ;; Update a frame's faces when we change its default font.
1179 (defun frame-update-faces (frame)
1180   (let* ((faces global-face-data)
1181          (rest faces))
1182     (while rest
1183       (let* ((face (car (car rest)))
1184              (font (face-font face t)))
1185         (if (listp font)
1186             (let ((bold (memq 'bold font))
1187                   (italic (memq 'italic font)))
1188               ;; Ignore any previous (string-valued) font, it might not even
1189               ;; be the right size anymore.
1190               (set-face-font face nil frame)
1191               (cond ((and bold italic)
1192                      (make-face-bold-italic face frame t))
1193                     (bold
1194                      (make-face-bold face frame t))
1195                     (italic
1196                      (make-face-italic face frame t)))))
1197       (setq rest (cdr rest)))
1198     frame)))
1199
1200 ;; Update the colors of FACE, after FRAME's own colors have been changed.
1201 ;; This applies only to faces with global color specifications
1202 ;; that are not simple constants.
1203 (defun frame-update-face-colors (frame)
1204   (let ((faces global-face-data))
1205     (while faces
1206       (condition-case nil
1207           (let* ((data (cdr (car faces)))
1208                  (face (car (car faces)))
1209                  (foreground (face-foreground data))
1210                  (background (face-background data)))
1211             ;; If the global spec is a specific color,
1212             ;; which doesn't depend on the frame's attributes,
1213             ;; we don't need to recalculate it now.
1214             (or (listp foreground)
1215                 (setq foreground nil))
1216             (or (listp background)
1217                 (setq background nil))
1218             ;; If we are going to frob this face at all,
1219             ;; reinitialize it first.
1220             (if (or foreground background)
1221                 (progn (set-face-foreground face nil frame)
1222                        (set-face-background face nil frame)))
1223             (if foreground
1224                 (face-try-color-list 'set-face-foreground
1225                                      face foreground frame))
1226             (if background
1227                 (face-try-color-list 'set-face-background
1228                                      face background frame)))
1229         (error nil))
1230       (setq faces (cdr faces)))))
1231
1232 ;; Fill in the face FACE from frame-independent face data DATA.
1233 ;; DATA should be the non-frame-specific ("global") face vector
1234 ;; for the face.  FACE should be a face name or face object.
1235 ;; FRAME is the frame to act on; it must be an actual frame, not nil or t.
1236 (defun face-fill-in (face data frame)
1237   (condition-case nil
1238       (let ((foreground (face-foreground data))
1239             (background (face-background data))
1240             (font (face-font data))
1241             (stipple (face-stipple data)))
1242         (set-face-underline-p face (face-underline-p data) frame)
1243         (if foreground
1244             (face-try-color-list 'set-face-foreground
1245                                  face foreground frame))
1246         (if background
1247             (face-try-color-list 'set-face-background
1248                                  face background frame))
1249         (if (listp font)
1250             (let ((bold (memq 'bold font))
1251                   (italic (memq 'italic font)))
1252               (cond ((and bold italic)
1253                      (make-face-bold-italic face frame))
1254                     (bold
1255                      (make-face-bold face frame))
1256                     (italic
1257                      (make-face-italic face frame))))
1258           (if font
1259               (set-face-font face font frame)))
1260         (if stipple
1261             (set-face-stipple face stipple frame)))
1262     (error nil)))
1263
1264 ;; Assuming COLOR is a valid color name,
1265 ;; return t if it can be displayed on FRAME.
1266 (defun face-color-supported-p (frame color background-p)
1267   (and window-system
1268        (or (x-display-color-p frame)
1269            ;; A black-and-white display can implement these.
1270            (member color '("black" "white"))
1271            ;; A black-and-white display can fake gray for background.
1272            (and background-p
1273                 (face-color-gray-p color frame))
1274            ;; A grayscale display can implement colors that are gray (more or less).
1275            (and (x-display-grayscale-p frame)
1276                 (face-color-gray-p color frame)))))
1277
1278 ;; Use FUNCTION to store a color in FACE on FRAME.
1279 ;; COLORS is either a single color or a list of colors.
1280 ;; If it is a list, try the colors one by one until one of them
1281 ;; succeeds.  We signal an error only if all the colors failed.
1282 ;; t as COLORS or as an element of COLORS means to invert the face.
1283 ;; That can't fail, so any subsequent elements after the t are ignored.
1284 (defun face-try-color-list (function face colors frame)
1285   (if (stringp colors)
1286       (if (face-color-supported-p frame colors
1287                                   (eq function 'set-face-background))
1288           (funcall function face colors frame))
1289     (if (eq colors t)
1290         (invert-face face frame)
1291       (let (done)
1292         (while (and colors (not done))
1293           (if (or (memq (car colors) '(t underline))
1294                   (face-color-supported-p frame (car colors)
1295                                           (eq function 'set-face-background)))
1296               (if (cdr colors)
1297                   ;; If there are more colors to try, catch errors
1298                   ;; and set `done' if we succeed.
1299                   (condition-case nil
1300                       (progn
1301                         (cond ((eq (car colors) t)
1302                                (invert-face face frame))
1303                               ((eq (car colors) 'underline)
1304                                (set-face-underline-p face t frame))
1305                               (t
1306                                (funcall function face (car colors) frame)))
1307                         (setq done t))
1308                     (error nil))
1309                 ;; If this is the last color, let the error get out if it fails.
1310                 ;; If it succeeds, we will exit anyway after this iteration.
1311                 (cond ((eq (car colors) t)
1312                        (invert-face face frame))
1313                       ((eq (car colors) 'underline)
1314                        (set-face-underline-p face t frame))
1315                       (t
1316                        (funcall function face (car colors) frame)))))
1317           (setq colors (cdr colors)))))))
1318
1319 ;; If we are already using x-window frames, initialize faces for them.
1320 (if (memq (framep (selected-frame)) '(x w32))
1321     (face-initialize))
1322
1323 (provide 'faces)
1324
1325 ;;; faces.el ends here