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;;; exwm-randr.el --- RandR Module for EXWM -*- lexical-binding: t -*-
;; Copyright (C) 2015 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, first load/enable it and properly configure the variable
;; `exwm-randr-workspace-output-plist':
;; (require 'exwm-randr)
;; (setq exwm-randr-workspace-output-plist '(0 "VGA1"))
;; (exwm-randr-enable)
;; Then configure RandR with 'xrandr':
;; $ xrandr --output VGA1 --left-of LVDS1 --auto
;; With above lines, workspace 0 should be assigned to the output named "VGA1",
;; staying at the left of other workspaces on the output "LVDS1".
;; References:
;; + RandR (http://www.x.org/archive/X11R7.7/doc/randrproto/randrproto.txt)
;;; Code:
(require 'xcb-randr)
(require 'exwm-core)
(eval-when-compile (require 'exwm-workspace))
(defvar exwm-randr-workspace-output-plist nil)
(defun exwm-randr--refresh ()
"Refresh workspaces according to the updated RandR info."
(let (output-name geometry output-plist default-geometry workareas viewports)
;; Query all outputs
(with-slots (config-timestamp outputs)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:randr:GetScreenResources
:window exwm--root))
(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))
(setf output-name ;UTF-8 encoded
(decode-coding-string (apply #'unibyte-string name) 'utf-8))
(if (or (/= connection xcb:randr:Connection:Connected)
(= 0 crtc)) ;FIXME
(plist-put output-plist output-name nil)
(with-slots (x y width height)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:randr:GetCrtcInfo
:crtc crtc
:config-timestamp config-timestamp))
(setq geometry (make-instance 'xcb:RECTANGLE
:x x :y y
:width width :height height)
output-plist (plist-put output-plist output-name geometry))
(unless default-geometry ;assume the first output as primary
(setq default-geometry geometry)))))))
(cl-assert (<= 2 (length output-plist)))
(dotimes (i exwm-workspace-number)
(let* ((output (plist-get exwm-randr-workspace-output-plist i))
(geometry (lax-plist-get output-plist output))
(frame (elt exwm-workspace--list i)))
(unless geometry
(setq geometry default-geometry
output nil))
(set-frame-parameter frame 'exwm-randr-output output)
(set-frame-parameter frame 'exwm-geometry geometry)
(with-slots (x y width height) geometry
(xcb:+request exwm--connection
(make-instance 'xcb:ConfigureWindow
:window (frame-parameter frame 'exwm-outer-id)
:value-mask (eval-when-compile
(logior xcb:ConfigWindow:X
xcb:ConfigWindow:Y
xcb:ConfigWindow:Width
xcb:ConfigWindow:Height))
:x x :y y :width width :height height))
(setq workareas (nconc workareas (list x y width height))
viewports (nconc viewports (list x y))))))
;; Update _NET_WORKAREA
(xcb:+request exwm--connection
(make-instance 'xcb:ewmh:set-_NET_WORKAREA
:window exwm--root :data (vconcat workareas)))
;; Update _NET_DESKTOP_VIEWPORT
(xcb:+request exwm--connection
(make-instance 'xcb:ewmh:set-_NET_DESKTOP_VIEWPORT
:window exwm--root
:data (vconcat viewports)))
(xcb:flush exwm--connection)))
(defun exwm-randr--init ()
"Initialize RandR extension and EXWM RandR module."
(if (= 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 2))
(if (or (/= major-version 1) (< minor-version 2))
(error "[EXWM] The server only support RandR version up to %d.%d"
major-version minor-version)
(exwm-randr--refresh)
(xcb:+event exwm--connection 'xcb:randr:ScreenChangeNotify
(lambda (_data _synthetic)
(exwm--log "(RandR) ScreenChangeNotify")
(exwm-randr--refresh)))
;; (xcb:+event exwm--connection 'xcb:randr:Notify
;; (lambda (_data _synthetic)
;; (exwm--log "(RandR) Notify")
;; (exwm-randr--refresh)))
(xcb:+request exwm--connection
(make-instance 'xcb:randr:SelectInput
:window exwm--root
:enable xcb:randr:NotifyMask:ScreenChange
;; :enable (eval-when-compile
;; (logior
;; xcb:randr:NotifyMask:ScreenChange
;; xcb:randr:NotifyMask:OutputChange
;; xcb:randr:NotifyMask:OutputProperty
;; xcb:randr:NotifyMask:CrtcChange))
))
(xcb:flush exwm--connection)))))
(defun exwm-randr-enable ()
"Enable RandR support for EXWM."
(add-hook 'exwm-init-hook #'exwm-randr--init))
(provide 'exwm-randr)
;;; exwm-randr.el ends here
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