w32-win.el 23.9 KB
Newer Older
Daniel Colascione's avatar
Daniel Colascione committed
1
;;; w32-win.el --- parse switches controlling interface with W32 window system -*- lexical-binding: t -*-
Erik Naggum's avatar
Erik Naggum committed
2

Paul Eggert's avatar
Paul Eggert committed
3
;; Copyright (C) 1993-1994, 2001-2019 Free Software Foundation, Inc.
Geoff Voelker's avatar
Geoff Voelker committed
4 5 6 7

;; Author: Kevin Gallo
;; Keywords: terminals

Erik Naggum's avatar
Erik Naggum committed
8 9
;; This file is part of GNU Emacs.

10
;; GNU Emacs is free software: you can redistribute it and/or modify
Erik Naggum's avatar
Erik Naggum committed
11
;; it under the terms of the GNU General Public License as published by
12 13
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
Erik Naggum's avatar
Erik Naggum committed
14 15 16 17 18 19 20

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
21
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
Geoff Voelker's avatar
Geoff Voelker committed
22 23 24

;;; Commentary:

Geoff Voelker's avatar
Geoff Voelker committed
25 26 27 28
;; w32-win.el:  this file is loaded from ../lisp/startup.el when it recognizes
;; that W32 windows are to be used.  Command line switches are parsed and those
;; pertaining to W32 are processed and removed from the command line.  The
;; W32 display is opened and hooks are set for popping up the initial window.
Geoff Voelker's avatar
Geoff Voelker committed
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

;; startup.el will then examine startup files, and eventually call the hooks
;; which create the first window (s).

;;; Code:


;; These are the standard X switches from the Xt Initialize.c file of
;; Release 4.

;; Command line		Resource Manager string

;; +rv			*reverseVideo
;; +synchronous		*synchronous
;; -background		*background
;; -bd			*borderColor
;; -bg			*background
;; -bordercolor		*borderColor
;; -borderwidth		.borderWidth
;; -bw			.borderWidth
;; -display		.display
;; -fg			*foreground
;; -fn			*font
;; -font		*font
;; -foreground		*foreground
;; -geometry		.geometry
;; -i			.iconType
;; -itype		.iconType
;; -iconic		.iconic
;; -name		.name
;; -reverse		*reverseVideo
;; -rv			*reverseVideo
;; -selectionTimeout    .selectionTimeout
;; -synchronous		*synchronous
;; -xrm

;; An alist of X options and the function which handles them.  See
;; ../startup.el.

Jason Rumney's avatar
Jason Rumney committed
68
;; (if (not (eq window-system 'w32))
69
;;     (error "%s: Loading w32-win.el but not compiled for w32" invocation-name))
70

71
(eval-when-compile (require 'cl-lib))
Geoff Voelker's avatar
Geoff Voelker committed
72 73 74 75 76 77
(require 'frame)
(require 'mouse)
(require 'scroll-bar)
(require 'faces)
(require 'select)
(require 'menu-bar)
78
(require 'dnd)
79
(require 'w32-vars)
Jason Rumney's avatar
Jason Rumney committed
80

81 82
;; Keep an obsolete alias for w32-focus-frame and w32-select-font in case
;; they are used by code outside Emacs.
83
(define-obsolete-function-alias 'w32-focus-frame 'x-focus-frame "23.1")
Glenn Morris's avatar
Glenn Morris committed
84 85
(declare-function x-select-font "w32font.c"
                  (&optional frame exclude-proportional))
86
(define-obsolete-function-alias 'w32-select-font 'x-select-font "23.1")
87

88
(defvar w32-color-map) ;; defined in w32fns.c
89
(make-obsolete 'w32-default-color-map nil "24.1")
90

91
(declare-function w32-send-sys-command "w32fns.c")
92
(declare-function set-message-beep "w32fns.c")
93

94
(declare-function cygwin-convert-file-name-from-windows "cygw32.c"
95
		  (path &optional absolute_p))
96

97
;; Conditional on new-fontset so bootstrapping works on non-GUI compiles
98 99
(if (fboundp 'new-fontset)
    (require 'fontset))
Geoff Voelker's avatar
Geoff Voelker committed
100

101
;; The following definition is used for debugging scroll bar events.
102
;(defun w32-handle-scroll-bar-event (event) (interactive "e") (princ event))
103

104 105 106 107
;; (defun w32-drag-n-drop-debug (event)
;;   "Print the drag-n-drop EVENT in a readable form."
;;   (interactive "e")
;;   (princ event))
108

Daniel Colascione's avatar
Daniel Colascione committed
109 110
(defun w32-handle-dropped-file (window file-name)
  (let ((f (if (eq system-type 'cygwin)
111
               (cygwin-convert-file-name-from-windows file-name t)
Daniel Colascione's avatar
Daniel Colascione committed
112
             (subst-char-in-string ?\\ ?/ file-name)))
113 114 115 116 117 118 119
        (coding (if (eq system-type 'windows-nt)
		    ;; Native w32 build pretends that its file names
		    ;; are encoded in UTF-8, and converts to the
		    ;; appropriate encoding internally.
		    'utf-8
		  (or file-name-coding-system
		      default-file-name-coding-system))))
Daniel Colascione's avatar
Daniel Colascione committed
120 121 122 123 124 125 126

    (setq file-name
          (mapconcat 'url-hexify-string
                     (split-string (encode-coding-string f coding)
                                   "/")
                     "/")))
		(dnd-handle-one-url window 'private
127 128 129 130 131
				    (concat
				     (if (eq system-type 'cygwin)
					 "file://"
				       "file:")
				     file-name)))
Daniel Colascione's avatar
Daniel Colascione committed
132 133

(defun w32-drag-n-drop (event &optional new-frame)
134
  "Edit the files listed in the drag-n-drop EVENT.
135 136
Switch to a buffer editing the last file dropped."
  (interactive "e")
137
  (save-excursion
138 139 140 141 142 143 144 145 146
    ;; Make sure the drop target has positive co-ords
    ;; before setting the selected frame - otherwise it
    ;; won't work.  <skx@tardis.ed.ac.uk>
    (let* ((window (posn-window (event-start event)))
	   (coords (posn-x-y (event-start event)))
	   (x (car coords))
	   (y (cdr coords)))
      (if (and (> x 0) (> y 0))
	  (set-frame-selected-window nil window))
Daniel Colascione's avatar
Daniel Colascione committed
147 148 149 150 151 152 153 154

      (when new-frame
        (select-frame (make-frame)))
      (raise-frame)
      (setq window (selected-window))

      (mapc (apply-partially #'w32-handle-dropped-file window)
            (car (cdr (cdr event)))))))
155 156

(defun w32-drag-n-drop-other-frame (event)
157
  "Edit the files listed in the drag-n-drop EVENT, in other frames.
158 159 160
May create new frames, or reuse existing ones.  The frame editing
the last file dropped is selected."
  (interactive "e")
Daniel Colascione's avatar
Daniel Colascione committed
161
  (w32-drag-n-drop event t))
162 163 164 165 166

;; Bind the drag-n-drop event.
(global-set-key [drag-n-drop] 'w32-drag-n-drop)
(global-set-key [C-drag-n-drop] 'w32-drag-n-drop-other-frame)

167 168 169 170 171 172
;; Keyboard layout/language change events
;; For now ignore language-change events; in the future
;; we should switch the Emacs Input Method to match the
;; new layout/language selected by the user.
(global-set-key [language-change] 'ignore)

173 174 175 176 177 178 179 180 181
;; Some Windows applications send the 'noname' (VK_NONAME) pseudo-key
;; to prevent Windows from sleeping.  We want to ignore these key
;; events, to avoid annoying users by ringing the bell and announcing
;; that the key is not bound.
(global-set-key [noname]   'ignore)
(global-set-key [C-noname] 'ignore)
(global-set-key [M-noname] 'ignore)


182 183
(defvar x-resource-name)

Geoff Voelker's avatar
Geoff Voelker committed
184 185 186

;;;; Function keys

Miles Bader's avatar
Miles Bader committed
187 188
 ;;; make f10 activate the real menubar rather than the mini-buffer menu
 ;;; navigation feature.
189
(defun w32-menu-bar-open (&optional frame)
Miles Bader's avatar
Miles Bader committed
190
   "Start key navigation of the menu bar in FRAME.
Glenn Morris's avatar
Glenn Morris committed
191

192 193
This initially activates the first menu-bar item, and you can then navigate
with the arrow keys, select a menu entry with the Return key or cancel with
194 195 196 197
one or two Escape keypresses.  (Two Escape keypresses are needed when a
menu was already dropped down by pressing Return.)

If FRAME has no menu bar, this function does nothing.
Glenn Morris's avatar
Glenn Morris committed
198

199 200 201
If FRAME is nil or not given, use the selected frame.
If FRAME does not have the menu bar enabled, display a text menu using
`tmm-menubar'."
Miles Bader's avatar
Miles Bader committed
202
   (interactive "i")
203 204 205 206
   (if menu-bar-mode
       (w32-send-sys-command ?\xf100 frame)
     (with-selected-frame (or frame (selected-frame))
       (tmm-menubar))))
Geoff Voelker's avatar
Geoff Voelker committed
207 208


209 210 211
;; W32 systems have different fonts than commonly found on X, so
;; we define our own standard fontset here.
(defvar w32-standard-fontset-spec
212
 "-*-Courier New-normal-r-*-*-13-*-*-*-c-*-fontset-standard"
213 214 215 216
 "String of fontset spec of the standard fontset.
This defines a fontset consisting of the Courier New variations for
European languages which are distributed with Windows as
\"Multilanguage Support\".
217

218
See the documentation of `create-fontset-from-fontset-spec' for the format.")
219

220 221
(defun w32-win-suspend-error ()
  "Report an error when a suspend is attempted."
222
  (error "Suspending an Emacs running under W32 makes no sense"))
Geoff Voelker's avatar
Geoff Voelker committed
223

224
(defvar dynamic-library-alist)
225
(defvar libpng-version)                 ; image.c #ifdef HAVE_NTGUI
226 227
(defvar libgif-version)
(defvar libjpeg-version)
228

229 230
(defvar libgnutls-version)              ; gnutls.c

231 232
;;; Set default known names for external libraries
(setq dynamic-library-alist
233 234 235 236 237 238 239
      (list
       '(xpm "libxpm.dll" "xpm4.dll" "libXpm-nox4.dll")
       ;; Versions of libpng 1.4.x and later are incompatible with
       ;; earlier versions.  Set up the list of libraries according to
       ;; the version we were compiled against.  (If we were compiled
       ;; without PNG support, libpng-version's value is -1.)
       (if (>= libpng-version 10400)
240 241 242 243 244 245 246 247 248
	   (let ((major (/ libpng-version 10000))
		 (minor (mod (/ libpng-version 100) 10)))
	     (list 'png
		   ;; libpngXY.dll is the default name when building
		   ;; with CMake or from a lpngXYY tarball on w32,
		   ;; libpngXY-XY.dll is the DLL name when building
		   ;; with libtool / autotools
		   (format "libpng%d%d.dll" major minor)
		   (format "libpng%d%d-%d%d.dll" major minor major minor)))
249 250 251
	 '(png "libpng12d.dll" "libpng12.dll" "libpng3.dll" "libpng.dll"
	       ;; these are libpng 1.2.8 from GTK+
	       "libpng13d.dll" "libpng13.dll"))
252
       '(tiff "libtiff-5.dll" "libtiff3.dll" "libtiff.dll")
253 254 255 256 257 258 259 260 261 262
       (if (> libjpeg-version 62)
	   ;; Versions of libjpeg after 6b are incompatible with
	   ;; earlier versions, and each of versions 7, 8, and 9 is
	   ;; also incompatible with the preceding ones (the core data
	   ;; structures used for communications with the library
	   ;; gained additional members with each new version).  So we
	   ;; must use only the version of the library which Emacs was
	   ;; compiled against.
	   (list 'jpeg (format "libjpeg-%d.dll" (/ libjpeg-version 10)))
	 '(jpeg "jpeg62.dll" "libjpeg.dll" "jpeg-62.dll" "jpeg.dll"))
263 264 265 266 267 268
       ;; Versions of giflib 5.0.0 and later changed signatures of
       ;; several functions used by Emacs, which makes those versions
       ;; incompatible with previous ones.  We select the correct
       ;; libraries according to the version of giflib we were
       ;; compiled against.  (If we were compiled without GIF support,
       ;; libgif-version's value is -1.)
269 270 271 272 273 274 275 276 277 278
       (if (>= libgif-version 50100)
	   ;; Yes, giflib 5.0 uses 6 as the major version of the API,
	   ;; and giflib 5.1 uses 7, thus "libgif-7.dll" and
	   ;; "libgif-6.dll" below (giflib 4.x used 5 as the major API
	   ;; version).  giflib5.dll is from the lua-files project,
	   ;; and gif.dll is from luapower.
	   '(gif "libgif-7.dll")
	 (if (>= libgif-version 50000)
	     '(gif "libgif-6.dll" "giflib5.dll" "gif.dll")
	 '(gif "libgif-5.dll" "giflib4.dll" "libungif4.dll" "libungif.dll")))
279 280 281
       '(svg "librsvg-2-2.dll")
       '(gdk-pixbuf "libgdk_pixbuf-2.0-0.dll")
       '(glib "libglib-2.0-0.dll")
282
       '(gio "libgio-2.0-0.dll")
283
       '(gobject "libgobject-2.0-0.dll")
284 285 286
       (if (>= libgnutls-version 30400)
	   '(gnutls "libgnutls-30.dll")
	 '(gnutls "libgnutls-28.dll" "libgnutls-26.dll"))
287
       '(libxml2 "libxml2-2.dll" "libxml2.dll")
288
       '(zlib "zlib1.dll" "libz-1.dll")
289 290
       '(lcms2 "liblcms2-2.dll")
       '(json "libjansson-4.dll")))
291

292 293 294 295
;;; multi-tty support
(defvar w32-initialized nil
  "Non-nil if the w32 window system has been initialized.")

296 297
(declare-function x-open-connection "w32fns.c"
                  (display &optional xrm-string must-succeed))
298
(declare-function create-default-fontset "fontset" ())
299 300 301 302 303
(declare-function create-fontset-from-fontset-spec "fontset"
                  (fontset-spec &optional style-variant noerror))
(declare-function create-fontset-from-x-resource "fontset" ())
(declare-function x-get-resource "frame.c"
                  (attribute class &optional component subclass))
304 305 306
(declare-function x-handle-args "common-win" (args))
(declare-function x-parse-geometry "frame.c" (string))
(defvar x-command-line-resources)
307

308
(cl-defmethod window-system-initialization (&context (window-system w32)
309
                                            &optional _display)
Jason Rumney's avatar
Jason Rumney committed
310
  "Initialize Emacs for W32 GUI frames."
311
  (cl-assert (not w32-initialized))
312 313 314 315 316 317 318 319 320 321 322

  ;; Do the actual Windows setup here; the above code just defines
  ;; functions and variables that we use now.

  (setq command-line-args (x-handle-args command-line-args))

  ;; Make sure we have a valid resource name.
  (or (stringp x-resource-name)
      (setq x-resource-name
            ;; Change any . or * characters in x-resource-name to hyphens,
            ;; so as not to choke when we use it in X resource queries.
323
            (replace-regexp-in-string "[.*]" "-" invocation-name)))
324

325
  (x-open-connection "w32" x-command-line-resources
326 327 328
                     ;; Exit with a fatal error if this fails and we
                     ;; are the initial display
                     (eq initial-window-system 'w32))
329

330 331
  ;; Create the default fontset.
  (create-default-fontset)
332
  ;; Create the standard fontset.
333 334
  (condition-case err
      (create-fontset-from-fontset-spec w32-standard-fontset-spec t)
Glenn Morris's avatar
Glenn Morris committed
335
    (error (display-warning
336 337 338
	    'initialization
	    (format "Creation of the standard fontset failed: %s" err)
	    :error)))
339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
  ;; Create fontset specified in X resources "Fontset-N" (N is 0, 1,...).
  (create-fontset-from-x-resource)

  ;; Apply a geometry resource to the initial frame.  Put it at the end
  ;; of the alist, so that anything specified on the command line takes
  ;; precedence.
  (let* ((res-geometry (x-get-resource "geometry" "Geometry"))
         parsed)
    (if res-geometry
        (progn
          (setq parsed (x-parse-geometry res-geometry))
          ;; If the resource specifies a position,
          ;; call the position and size "user-specified".
          (if (or (assq 'top parsed) (assq 'left parsed))
              (setq parsed (cons '(user-position . t)
                                 (cons '(user-size . t) parsed))))
          ;; All geometry parms apply to the initial frame.
          (setq initial-frame-alist (append initial-frame-alist parsed))
          ;; The size parms apply to all frames.
358 359 360 361 362 363 364 365 366 367
          (if (and (assq 'height parsed)
                   (not (assq 'height default-frame-alist)))
              (setq default-frame-alist
                    (cons (cons 'height (cdr (assq 'height parsed)))
                          default-frame-alist))
          (if (and (assq 'width parsed)
                   (not (assq 'width default-frame-alist)))
              (setq default-frame-alist
                    (cons (cons 'width (cdr (assq 'width parsed)))
                          default-frame-alist)))))))
368

369 370 371 372
  ;; Check the reverseVideo resource.
  (let ((case-fold-search t))
    (let ((rv (x-get-resource "reverseVideo" "ReverseVideo")))
      (if (and rv (string-match "^\\(true\\|yes\\|on\\)$" rv))
373 374
          (setq default-frame-alist
                (cons '(reverse . t) default-frame-alist)))))
375

376
  ;; Don't let Emacs suspend under Windows.
377
  (add-hook 'suspend-hook #'w32-win-suspend-error)
378 379 380 381 382

  ;; Turn off window-splitting optimization; w32 is usually fast enough
  ;; that this is only annoying.
  (setq split-window-keep-point t)

383 384 385
  ;; W32 expects the menu bar cut and paste commands to use the clipboard.
  (menu-bar-enable-clipboard)

386 387 388 389 390
  ;; Don't show the frame name; that's redundant.
  (setq-default mode-line-frame-identification "  ")

  ;; Set to a system sound if you want a fancy bell.
  (set-message-beep 'ok)
391
  (x-apply-session-resources)
392
  (setq w32-initialized t))
Jason Rumney's avatar
Jason Rumney committed
393

394
(add-to-list 'display-format-alist '("\\`w32\\'" . w32))
395
(cl-defmethod handle-args-function (args &context (window-system w32))
396 397
  (x-handle-args args))

398
(cl-defmethod frame-creation-function (params &context (window-system w32))
399
  (x-create-frame-with-faces params))
Stefan Monnier's avatar
Stefan Monnier committed
400

401 402
;;;; Selections

Stefan Monnier's avatar
Stefan Monnier committed
403 404
(declare-function w32-set-clipboard-data "w32select.c"
		  (string &optional ignored))
405 406 407 408 409 410
(declare-function w32-get-clipboard-data "w32select.c"
                  (&optional ignored))
(declare-function w32-selection-exists-p "w32select.c"
                  (&optional selection terminal))
(declare-function w32-selection-targets "w32select.c"
                  (&optional selection terminal))
411

412 413 414
;;; Fix interface to (X-specific) mouse.el
(defun w32--set-selection (type value)
  (if (eq type 'CLIPBOARD)
415
      (w32-set-clipboard-data (replace-regexp-in-string "\0" "\\0" value t t))
416
    (put 'x-selections (or type 'PRIMARY) value)))
417 418

(defun w32--get-selection  (&optional type data-type)
419 420 421 422 423 424 425 426 427
  (cond ((and (eq type 'CLIPBOARD)
              (eq data-type 'STRING))
         (with-demoted-errors "w32-get-clipboard-data:%S"
           (w32-get-clipboard-data)))
        ((eq data-type 'TARGETS)
         (if (eq type 'CLIPBOARD)
             (w32-selection-targets type)
           (if (get 'x-selections (or type 'PRIMARY)) '[STRING])))
        (t (get 'x-selections (or type 'PRIMARY)))))
428 429 430 431 432

(defun w32--selection-owner-p (selection)
  (and (memq selection '(nil PRIMARY SECONDARY))
       (get 'x-selections (or selection 'PRIMARY))))

433
(cl-defmethod gui-backend-set-selection (type value
434
                                         &context (window-system w32))
435 436 437
  (w32--set-selection type value))

(cl-defmethod gui-backend-get-selection (type data-type
438
                                         &context (window-system w32))
439 440 441
  (w32--get-selection type data-type))

(cl-defmethod gui-backend-selection-owner-p (selection
442
                                             &context (window-system w32))
443
  (w32--selection-owner-p selection))
444

445
(cl-defmethod gui-backend-selection-exists-p (selection
446
                                              &context (window-system w32))
447
  (w32-selection-exists-p selection))
448 449 450

(when (eq system-type 'windows-nt)
  ;; Make copy&pasting in w32's console interact with the system's clipboard!
451 452 453
  ;; We could move those cl-defmethods outside of the `when' and use
  ;; "&context (system-type (eql windows-nt))" instead!
  (cl-defmethod gui-backend-set-selection (type value
454
                                           &context (window-system nil))
455 456 457
    (w32--set-selection type value))

  (cl-defmethod gui-backend-get-selection (type data-type
458
                                           &context (window-system nil))
459 460 461
    (w32--get-selection type data-type))

  (cl-defmethod gui-backend-selection-owner-p (selection
462
                                               &context (window-system nil))
463 464 465
    (w32--selection-owner-p selection))

  (cl-defmethod gui-selection-exists-p (selection
466
                                        &context (window-system nil))
467
    (w32-selection-exists-p selection)))
468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486

;; The "Windows" keys on newer keyboards bring up the Start menu
;; whether you want it or not - make Emacs ignore these keystrokes
;; rather than beep.
(global-set-key [lwindow] 'ignore)
(global-set-key [rwindow] 'ignore)

(declare-function x-server-version "w32fns.c" (&optional terminal))

(defun w32-version ()
  "Return the MS-Windows version numbers.
The value is a list of three integers: the major and minor version
numbers, and the build number."
  (x-server-version))

(defun w32-using-nt ()
  "Return non-nil if running on a Windows NT descendant.
That includes all Windows systems except for 9X/Me."
  (getenv "SystemRoot"))
Jason Rumney's avatar
Jason Rumney committed
487

488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
;; The value of the following variable was calculated using the table in
;; https://docs.microsoft.com/windows/desktop/Intl/unicode-subset-bitfields,
;; by looking for Unicode subranges for which no USB bits are defined.
(defconst w32-no-usb-subranges
  '((#x000800 . #x0008ff)
    (#x0018b0 . #x0018ff)
    (#x001a20 . #x001aff)
    (#x001bc0 . #x001bff)
    (#x001c80 . #x001cff)
    (#x002fe0 . #x002fef)
    (#x00a4d0 . #x00a4ff)
    (#x00a6a0 . #x00a6ff)
    (#x00a830 . #x00a83f)
    (#x00a8e0 . #x00a8ff)
    (#x00a960 . #x00a9ff)
    (#x00aa60 . #x00abff)
    (#x00d7b0 . #x00d7ff)
    (#x010200 . #x01027f)
    (#x0102e0 . #x0102ff)
    (#x010350 . #x01037f)
    (#x0103e0 . #x0103ff)
    (#x0104b0 . #x0107ff)
    (#x010840 . #x0108ff)
    (#x010940 . #x0109ff)
    (#x010a60 . #x011fff)
    (#x012480 . #x01cfff)
    (#x01d250 . #x01d2ff)
    (#x01d380 . #x01d3ff)
    (#x01d800 . #x01efff)
    (#x01f0a0 . #x01ffff)
    (#x02a6e0 . #x02f7ff)
    (#x02fa20 . #x0dffff)
    (#x0e0080 . #x0e00ff)
    (#x0e01f0 . #x0fefff))
  "List of Unicode subranges whose support cannot be announced by a font.
The FONTSIGNATURE structure reported by MS-Windows for a font
includes 123 Unicode Subset bits (USBs) to identify subranges of
the Unicode codepoint space supported by the font.  Since the
number of bits is fixed, not every Unicode block can have a
corresponding USB bit; fonts that support characters from blocks
that have no USBs cannot communicate their support to Emacs,
unless the font is opened and physically tested for glyphs for
characters from these blocks.")

(defun w32--filter-USB-scripts ()
  "Filter USB scripts out of `script-representative-chars'."
  (let (val)
    (dolist (elt script-representative-chars)
      (let ((subranges w32-no-usb-subranges)
            (chars (cdr elt))
            ch found subrange)
        (while (and (consp chars) (not found))
          (setq ch (car chars)
                chars (cdr chars))
          (while (and (consp subranges) (not found))
            (setq subrange (car subranges)
                  subranges (cdr subranges))
            (when (and (>= ch (car subrange)) (<= ch (cdr subrange)))
              (setq found t)
              (push elt val))))))
    (nreverse val)))

(defvar w32-non-USB-fonts nil
  "Alist of script symbols and corresponding fonts.
Each element of the alist has the form (SCRIPT FONTS...), where
SCRIPT is a symbol of a script and FONTS are one or more fonts installed
on the system that can display SCRIPT's characters.  FONTS are
specified as symbols.
Only scripts that have no corresponding Unicode Subset Bits (USBs) can
be found in this alist.
This alist is used by w32font.c when it looks for fonts that can display
characters from scripts for which no USBs are defined.")

(defun w32-find-non-USB-fonts (&optional frame size)
  "Compute the value of `w32-non-USB-fonts' for specified SIZE and FRAME.
FRAME defaults to the selected frame.
SIZE is the required font size and defaults to the nominal size of the
default font on FRAME, or its best approximation."
  (let* ((inhibit-compacting-font-caches t)
         (all-fonts
          (delete-dups
           (x-list-fonts "-*-*-medium-r-normal-*-*-*-*-*-*-iso10646-1"
                         'default frame)))
         val)
    (mapc (function
           (lambda (script-desc)
             (let* ((script (car script-desc))
                    (script-chars (vconcat (cdr script-desc)))
                    (nchars (length script-chars))
                    (fntlist all-fonts)
                    (entry (list script))
                    fspec ffont font-obj glyphs idx)
               ;; For each font in FNTLIST, determine whether it
               ;; supports the representative character(s) of any
               ;; scripts that have no USBs defined for it.
               (dolist (fnt fntlist)
                 (setq fspec (ignore-errors (font-spec :name fnt)))
                 (if fspec
                     (setq ffont (find-font fspec frame)))
                 (when ffont
                   (setq font-obj
                         (open-font ffont size frame))
                   ;; Ignore fonts for which open-font returns nil:
                   ;; they are buggy fonts that we cannot use anyway.
                   (setq glyphs
                         (if font-obj
                             (font-get-glyphs font-obj
                                              0 nchars script-chars)
                           '[nil]))
                   ;; Does this font support ALL of the script's
                   ;; representative characters?
                   (setq idx 0)
                   (while (and (< idx nchars) (not (null (aref glyphs idx))))
                     (setq idx (1+ idx)))
                   (if (= idx nchars)
                       ;; It does; add this font to the script's entry in alist.
                       (let ((font-family (font-get font-obj :family)))
                         ;; Unifont is an ugly font, and it is already
                         ;; present in the default fontset.
                         (unless (string= (downcase (symbol-name font-family))
                                          "unifont")
                           (push font-family entry))))))
                 (if (> (length entry) 1)
                     (push (nreverse entry) val)))))
          (w32--filter-USB-scripts))
    ;; We've opened a lot of fonts, so clear the font caches to free
    ;; some memory.
    (clear-font-cache)
    (and val (setq w32-non-USB-fonts val))))

Jason Rumney's avatar
Jason Rumney committed
618
(provide 'w32-win)
619
(provide 'term/w32-win)
620

Geoff Voelker's avatar
Geoff Voelker committed
621
;;; w32-win.el ends here