about summary refs log tree commit diff
path: root/exwm-randr.el
blob: 8d1824babb83f7e021b732bb1360375f593b69d8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
;;; exwm-randr.el --- RandR Module for EXWM  -*- lexical-binding: t -*-

;; Copyright (C) 2015-2023 Free Software Foundation, Inc.

;; Author: Chris Feng <chris.w.feng@gmail.com>

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; 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
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This module adds RandR support for EXWM.  Currently it requires external
;; tools such as xrandr(1) to properly configure RandR first.  This
;; dependency may be removed in the future, but more work is needed before
;; that.

;; To use this module, load, enable it and configure
;; `exwm-randr-workspace-monitor-plist' and `exwm-randr-screen-change-hook'
;; as follows:
;;
;;   (require 'exwm-randr)
;;   (setq exwm-randr-workspace-monitor-plist '(0 "VGA1"))
;;   (add-hook 'exwm-randr-screen-change-hook
;;             (lambda ()
;;               (start-process-shell-command
;;                "xrandr" nil "xrandr --output VGA1 --left-of LVDS1 --auto")))
;;   (exwm-randr-enable)
;;
;; With above lines, workspace 0 should be assigned to the output named "VGA1",
;; staying at the left of other workspaces on the output "LVDS1".  Please refer
;; to xrandr(1) for the configuration of RandR.

;; References:
;; + RandR (http://www.x.org/archive/X11R7.7/doc/randrproto/randrproto.txt)

;;; Code:

(require 'xcb-randr)

(require 'exwm-core)
(require 'exwm-workspace)

(declare-function x-get-atom-name "C source code" (VALUE &optional FRAME))

(defgroup exwm-randr nil
  "RandR."
  :version "25.3"
  :group 'exwm)

(defcustom exwm-randr-refresh-hook nil
  "Normal hook run when the RandR module just refreshed."
  :type 'hook)

(defcustom exwm-randr-screen-change-hook nil
  "Normal hook run when screen changes."
  :type 'hook)

(defcustom exwm-randr-workspace-monitor-plist nil
  "Plist mapping workspaces to monitors.

In RandR 1.5 a monitor is a rectangle region decoupled from the physical
size of screens, and can be identified with `xrandr --listmonitors' (name of
the primary monitor is prefixed with an `*').  When no monitor is created it
automatically fallback to RandR 1.2 output which represents the physical
screen size.  RandR 1.5 monitors can be created with `xrandr --setmonitor'.
For example, to split an output (`LVDS-1') of size 1280x800 into two
side-by-side monitors one could invoke (the digits after `/' are size in mm)

    xrandr --setmonitor *LVDS-1-L 640/135x800/163+0+0 LVDS-1
    xrandr --setmonitor LVDS-1-R 640/135x800/163+640+0 none

If a monitor is not active, the workspaces mapped to it are displayed on the
primary monitor until it becomes active (if ever).  Unspecified workspaces
are all mapped to the primary monitor.  For example, with the following
setting workspace other than 1 and 3 would always be displayed on the
primary monitor where workspace 1 and 3 would be displayed on their
corresponding monitors whenever the monitors are active.

  \\='(1 \"HDMI-1\" 3 \"DP-1\")"
  :type '(plist :key-type integer :value-type string))

(with-no-warnings
  (define-obsolete-variable-alias 'exwm-randr-workspace-output-plist
    'exwm-randr-workspace-monitor-plist "27.1"))

(defvar exwm-randr--last-timestamp 0 "Used for debouncing events.")

(defvar exwm-randr--prev-screen-change-seqnum nil
  "The most recent ScreenChangeNotify sequence number.")

(defvar exwm-randr--compatibility-mode nil
  "Non-nil when the server does not support RandR 1.5 protocol.")

(defun exwm-randr--get-monitors ()
  "Get RandR 1.5 monitors."
  (exwm--log)
  (let (monitor-name geometry monitor-geometry-alist primary-monitor)
    (with-slots (timestamp monitors)
        (xcb:+request-unchecked+reply exwm--connection
            (make-instance 'xcb:randr:GetMonitors
                           :window exwm--root
                           :get-active 1))
      (when (> timestamp exwm-randr--last-timestamp)
        (setq exwm-randr--last-timestamp timestamp))
      (dolist (monitor monitors)
        (with-slots (name primary x y width height) monitor
          (setq monitor-name (x-get-atom-name name)
                geometry (make-instance 'xcb:RECTANGLE
                                        :x x
                                        :y y
                                        :width width
                                        :height height)
                monitor-geometry-alist (cons (cons monitor-name geometry)
                                             monitor-geometry-alist))
          (exwm--log "%s: %sx%s+%s+%s" monitor-name x y width height)
          ;; Save primary monitor when available (fallback to the first one).
          (when (or (/= 0 primary)
                    (not primary-monitor))
            (setq primary-monitor monitor-name)))))
    (exwm--log "Primary monitor: %s" primary-monitor)
    (list primary-monitor monitor-geometry-alist
          (exwm-randr--get-monitor-alias primary-monitor
                                         monitor-geometry-alist))))

(defun exwm-randr--get-outputs ()
  "Get RandR 1.2 outputs.

Only used when RandR 1.5 is not supported by the server."
  (exwm--log)
  (let (output-name geometry output-geometry-alist primary-output)
    (with-slots (config-timestamp outputs)
        (xcb:+request-unchecked+reply exwm--connection
            (make-instance 'xcb:randr:GetScreenResourcesCurrent
                           :window exwm--root))
      (when (> config-timestamp exwm-randr--last-timestamp)
        (setq exwm-randr--last-timestamp config-timestamp))
      (dolist (output outputs)
        (with-slots (crtc connection name)
            (xcb:+request-unchecked+reply exwm--connection
                (make-instance 'xcb:randr:GetOutputInfo
                               :output output
                               :config-timestamp config-timestamp))
          (when (and (= connection xcb:randr:Connection:Connected)
                     (/= crtc 0))
            (with-slots (x y width height)
                (xcb:+request-unchecked+reply exwm--connection
                    (make-instance 'xcb:randr:GetCrtcInfo
                                   :crtc crtc
                                   :config-timestamp config-timestamp))
              (setq output-name (decode-coding-string
                                 (apply #'unibyte-string name) 'utf-8)
                    geometry (make-instance 'xcb:RECTANGLE
                                            :x x
                                            :y y
                                            :width width
                                            :height height)
                    output-geometry-alist (cons (cons output-name geometry)
                                                output-geometry-alist))
              (exwm--log "%s: %sx%s+%s+%s" output-name x y width height)
              ;; The primary output is the first one.
              (unless primary-output
                (setq primary-output output-name)))))))
    (exwm--log "Primary output: %s" primary-output)
    (list primary-output output-geometry-alist
          (exwm-randr--get-monitor-alias primary-output
                                         output-geometry-alist))))

(defun exwm-randr--get-monitor-alias (primary-monitor monitor-geometry-alist)
  "Generate monitor aliases using PRIMARY-MONITOR MONITOR-GEOMETRY-ALIST.

In a mirroring setup some monitors overlap and should be treated as one."
  (let (monitor-position-alist monitor-alias-alist monitor-name geometry)
    (setq monitor-position-alist (with-slots (x y)
                                     (cdr (assoc primary-monitor
                                                 monitor-geometry-alist))
                                   (list (cons primary-monitor (vector x y)))))
    (setq monitor-alias-alist (list (cons primary-monitor primary-monitor)))
    (dolist (pair monitor-geometry-alist)
      (setq monitor-name (car pair)
            geometry (cdr pair))
      (unless (assoc monitor-name monitor-alias-alist)
        (let* ((position (vector (slot-value geometry 'x)
                                 (slot-value geometry 'y)))
               (alias (car (rassoc position monitor-position-alist))))
          (if alias
              (setq monitor-alias-alist (cons (cons monitor-name alias)
                                              monitor-alias-alist))
            (setq monitor-position-alist (cons (cons monitor-name position)
                                               monitor-position-alist)
                  monitor-alias-alist (cons (cons monitor-name monitor-name)
                                            monitor-alias-alist))))))
    monitor-alias-alist))

;;;###autoload
(defun exwm-randr-refresh ()
  "Refresh workspaces according to the updated RandR info."
  (interactive)
  (exwm--log)
  (let* ((result (if exwm-randr--compatibility-mode
                     (exwm-randr--get-outputs)
                   (exwm-randr--get-monitors)))
         (primary-monitor (elt result 0))
         (monitor-geometry-alist (elt result 1))
         (monitor-alias-alist (elt result 2))
         container-monitor-alist container-frame-alist)
    (when (and primary-monitor monitor-geometry-alist)
      (when exwm-workspace--fullscreen-frame-count
        ;; Not all workspaces are fullscreen; reset this counter.
        (setq exwm-workspace--fullscreen-frame-count 0))
      (dotimes (i (exwm-workspace--count))
        (let* ((monitor (plist-get exwm-randr-workspace-monitor-plist i))
               (geometry (cdr (assoc monitor monitor-geometry-alist)))
               (frame (elt exwm-workspace--list i))
               (container (frame-parameter frame 'exwm-container)))
          (if geometry
              ;; Unify monitor names in case it's a mirroring setup.
              (setq monitor (cdr (assoc monitor monitor-alias-alist)))
            ;; Missing monitors fallback to the primary one.
            (setq monitor primary-monitor
                  geometry (cdr (assoc primary-monitor
                                       monitor-geometry-alist))))
          (setq container-monitor-alist (nconc
                                         `((,container . ,(intern monitor)))
                                         container-monitor-alist)
                container-frame-alist (nconc `((,container . ,frame))
                                             container-frame-alist))
          (set-frame-parameter frame 'exwm-randr-monitor monitor)
          (set-frame-parameter frame 'exwm-geometry geometry)))
      ;; Update workareas.
      (exwm-workspace--update-workareas)
      ;; Resize workspace.
      (dolist (f exwm-workspace--list)
        (exwm-workspace--set-fullscreen f))
      (xcb:flush exwm--connection)
      ;; Raise the minibuffer if it's active.
      (when (and (active-minibuffer-window)
                 (exwm-workspace--minibuffer-own-frame-p))
        (exwm-workspace--show-minibuffer))
      ;; Set _NET_DESKTOP_GEOMETRY.
      (exwm-workspace--set-desktop-geometry)
      ;; Update active/inactive workspaces.
      (dolist (w exwm-workspace--list)
        (exwm-workspace--set-active w nil))
      ;; Mark the workspace on the top of each monitor as active.
      (dolist (xwin
               (reverse
                (slot-value (xcb:+request-unchecked+reply exwm--connection
                                (make-instance 'xcb:QueryTree
                                               :window exwm--root))
                            'children)))
        (let ((monitor (cdr (assq xwin container-monitor-alist))))
          (when monitor
            (setq container-monitor-alist
                  (rassq-delete-all monitor container-monitor-alist))
            (exwm-workspace--set-active (cdr (assq xwin container-frame-alist))
                                        t))))
      (xcb:flush exwm--connection)
      (run-hooks 'exwm-randr-refresh-hook))))

(define-obsolete-function-alias 'exwm-randr--refresh #'exwm-randr-refresh
  "27.1")

(defun exwm-randr--on-ScreenChangeNotify (data _synthetic)
  "Handle `ScreenChangeNotify' event.

Run `exwm-randr-screen-change-hook' (usually user scripts to configure RandR)."
  (exwm--log)
  (let ((evt (make-instance 'xcb:randr:ScreenChangeNotify)))
    (xcb:unmarshal evt data)
    (let ((seqnum (slot-value evt '~sequence)))
      (unless (equal seqnum exwm-randr--prev-screen-change-seqnum)
        (setq exwm-randr--prev-screen-change-seqnum seqnum)
        (run-hooks 'exwm-randr-screen-change-hook)))))

(defun exwm-randr--on-Notify (data _synthetic)
  "Handle `CrtcChangeNotify' and `OutputChangeNotify' events.

Refresh when any CRTC/output changes."
  (exwm--log)
  (let ((evt (make-instance 'xcb:randr:Notify))
        notify)
    (xcb:unmarshal evt data)
    (with-slots (subCode u) evt
      (cl-case subCode
        (xcb:randr:Notify:CrtcChange
         (setq notify (slot-value u 'cc)))
        (xcb:randr:Notify:OutputChange
         (setq notify (slot-value u 'oc))))
      (when notify
        (with-slots (timestamp) notify
          (when (> timestamp exwm-randr--last-timestamp)
            (exwm-randr-refresh)
            (setq exwm-randr--last-timestamp timestamp)))))))

(defun exwm-randr--on-ConfigureNotify (data _synthetic)
  "Handle `ConfigureNotify' event.

Refresh when any RandR 1.5 monitor changes."
  (exwm--log)
  (let ((evt (make-instance 'xcb:ConfigureNotify)))
    (xcb:unmarshal evt data)
    (with-slots (window) evt
      (when (eq window exwm--root)
        (exwm-randr-refresh)))))

(defun exwm-randr--init ()
  "Initialize RandR extension and EXWM RandR module."
  (exwm--log)
  (when (= 0 (slot-value (xcb:get-extension-data exwm--connection 'xcb:randr)
                         'present))
    (error "[EXWM] RandR extension is not supported by the server"))
  (with-slots (major-version minor-version)
      (xcb:+request-unchecked+reply exwm--connection
          (make-instance 'xcb:randr:QueryVersion
                         :major-version 1 :minor-version 5))
    (cond ((and (= major-version 1) (= minor-version 5))
           (setq exwm-randr--compatibility-mode nil))
          ((and (= major-version 1) (>= minor-version 2))
           (setq exwm-randr--compatibility-mode t))
          (t
           (error "[EXWM] The server only support RandR version up to %d.%d"
                  major-version minor-version)))
    ;; External monitor(s) may already be connected.
    (run-hooks 'exwm-randr-screen-change-hook)
    (exwm-randr-refresh)
    ;; Listen for `ScreenChangeNotify' to notify external tools to
    ;; configure RandR and `CrtcChangeNotify/OutputChangeNotify' to
    ;; refresh the workspace layout.
    (xcb:+event exwm--connection 'xcb:randr:ScreenChangeNotify
                #'exwm-randr--on-ScreenChangeNotify)
    (xcb:+event exwm--connection 'xcb:randr:Notify
                #'exwm-randr--on-Notify)
    (xcb:+event exwm--connection 'xcb:ConfigureNotify
                #'exwm-randr--on-ConfigureNotify)
    (xcb:+request exwm--connection
        (make-instance 'xcb:randr:SelectInput
                       :window exwm--root
                       :enable (logior
                                xcb:randr:NotifyMask:ScreenChange
                                xcb:randr:NotifyMask:CrtcChange
                                xcb:randr:NotifyMask:OutputChange)))
    (xcb:flush exwm--connection)
    (add-hook 'exwm-workspace-list-change-hook #'exwm-randr-refresh))
  ;; Prevent frame parameters introduced by this module from being
  ;; saved/restored.
  (dolist (i '(exwm-randr-monitor))
    (unless (assq i frameset-filter-alist)
      (push (cons i :never) frameset-filter-alist))))

(defun exwm-randr--exit ()
  "Exit the RandR module."
  (exwm--log)
  (remove-hook 'exwm-workspace-list-change-hook #'exwm-randr-refresh))

(defun exwm-randr-enable ()
  "Enable RandR support for EXWM."
  (exwm--log)
  (add-hook 'exwm-init-hook #'exwm-randr--init)
  (add-hook 'exwm-exit-hook #'exwm-randr--exit))



(provide 'exwm-randr)

;;; exwm-randr.el ends here