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Rouven Czerwinski 988fe5bda9 relative_pointer: handle inert pointer objects 
Since 5e0ef70cc0 ("seat: Create inert objects for missing capabilities")
wlroots can create inert seat objects when the capability is currently missing
for the client but it had the capablity before. The client hoever will happily
handover the wl_pointer resource to the relative_pointer implementation,
creating a NULL pointer dereference when trying to access the seat_client which
is set to NULL for inert objects.

Since the protocol does not contain an error for such requests, we hand out an
relative_pointer handle with the seat set to NULL.
We also need to check whether there is an associated seat in
send_relative_motion and need to tweak the destroy notifier in case no seat is
available.

This way we can hand out a valid relative_pointer resource and don't crash the
compositor when trying to access an inert seat pointer resource in
relative_pointer.

Relevant WAYLAND_DEBUG=1 when testing a client and switching VT every second:
[2619872.442] wl_seat@30.capabilities(3)
[2619872.460]  -> wl_seat@30.get_pointer(new id wl_pointer@36)
[2619872.484] wl_data_device@25.selection(nil)
[2619872.504] zwp_primary_selection_device_v1@26.selection(nil)
[2619874.995] wl_seat@12.capabilities(3)
[2619875.035]  -> wl_compositor@5.create_surface(new id wl_surface@37)
[2619875.088]  -> wl_seat@12.get_pointer(new id wl_pointer@29)
[2619875.105]  -> zwp_relative_pointer_manager_v1@8.get_relative_pointer(new id zwp_relative_pointer_v1@27, wl_pointer@29)
[2619875.127]  -> wl_compositor@5.create_surface(new id wl_surface@35)
[2619875.139]  -> wl_seat@12.get_pointer(new id wl_pointer@43)
[2619981.180] wl_seat@12.capabilities(2)
[2619981.214]  -> zwp_relative_pointer_v1@27.destroy()
[2619981.226]  -> wl_pointer@29.release()
[2619981.236]  -> wl_surface@37.destroy()
[2619981.247]  -> wl_pointer@43.release()
[2619981.254]  -> wl_surface@35.destroy()
[2619981.262] wl_seat@12.capabilities(0)
[2619981.285]  -> wl_keyboard@33.release()
[2619987.316] wl_seat@30.capabilities(2)
[2619987.336]  -> wl_pointer@36.release()
[2619987.363] wl_seat@30.capabilities(0)
[2619987.371]  -> wl_keyboard@34.release()
[2621932.880] wl_display@1.delete_id(41)
[2621932.903] wl_display@1.delete_id(40)
[2621932.910] wl_display@1.delete_id(27)
[2621932.917] wl_display@1.delete_id(29)
[2621932.924] wl_display@1.delete_id(37)
[2621932.930] wl_display@1.delete_id(43)
[2621932.944] wl_display@1.delete_id(35)
[2621932.950] wl_display@1.delete_id(33)
[2621932.959] wl_seat@12.capabilities(2)
[2621932.976]  -> wl_seat@12.get_keyboard(new id wl_keyboard@33)
[2621936.875] wl_seat@12.capabilities(3)
[2621936.893]  -> wl_compositor@5.create_surface(new id wl_surface@35)
[2621936.931]  -> wl_seat@12.get_pointer(new id wl_pointer@43)
[2621936.945]  -> zwp_relative_pointer_manager_v1@8.get_relative_pointer(new id zwp_relative_pointer_v1@37, wl_pointer@43)
[2621936.965]  -> wl_compositor@5.create_surface(new id wl_surface@29)
[2621936.987]  -> wl_seat@12.get_pointer(new id wl_pointer@27)
[2621942.796] wl_data_device@25.selection(nil)
[2621942.817] zwp_primary_selection_device_v1@26.selection(nil)
[2621942.823] wl_seat@30.capabilities(2)
2022-05-30 14:10:22 +00:00
.builds ci/archlinux: enable address and undefined sanitizers 2021-11-19 16:42:14 +00:00
backend output: pass wlr_output_state to backend 2022-05-30 11:34:57 +02:00
docs docs/env_vars: fix case of WLR_SCENE_DEBUG_DAMAGE values 2022-05-27 18:26:50 +00:00
examples build: make GBM optional 2022-05-30 13:30:08 +00:00
include build: make GBM optional 2022-05-30 13:30:08 +00:00
protocol ext-session-lock-v1: new protocol implementation 2022-02-02 15:22:02 +01:00
render build: make GBM optional 2022-05-30 13:30:08 +00:00
tinywl tinywl: use xdg-shell v3 2022-05-27 13:31:30 +00:00
types relative_pointer: handle inert pointer objects 2022-05-30 14:10:22 +00:00
util util: Fix infinite loop in recursive function 2022-05-24 20:39:32 +00:00
xcursor xcursor: check that XDG base directory path is absolute 2022-05-02 15:15:24 +02:00
xwayland xwayland: Add support for -force-xrandr-emulation 2022-05-23 07:30:28 +00:00
.editorconfig editorconfig: set max_line_length 2022-01-20 15:09:15 +01:00
.gitignore gitignore: remove unnecessary entries, add subprojects/ 2022-05-28 12:23:51 +02:00
.gitlab-ci.yml ci: add .gitlab-ci.yml 2021-11-01 16:51:18 +01:00
CONTRIBUTING.md contributing: add section about documentation conventions 2022-05-25 14:22:58 +00:00
LICENSE Update LICENSE year (MIT license) 2018-04-12 21:29:59 -04:00
meson.build build: make GBM optional 2022-05-30 13:30:08 +00:00
meson_options.txt build: make GBM optional 2022-05-30 13:30:08 +00:00
README.md build: make GBM optional 2022-05-30 13:30:08 +00:00
wlroots.syms build: simplify version script 2021-06-17 11:03:21 +02:00

README.md

wlroots

Pluggable, composable, unopinionated modules for building a Wayland compositor; or about 60,000 lines of code you were going to write anyway.

  • wlroots provides backends that abstract the underlying display and input hardware, including KMS/DRM, libinput, Wayland, X11, and headless backends, plus any custom backends you choose to write, which can all be created or destroyed at runtime and used in concert with each other.
  • wlroots provides unopinionated, mostly standalone implementations of many Wayland interfaces, both from wayland.xml and various protocol extensions. We also promote the standardization of portable extensions across many compositors.
  • wlroots provides several powerful, standalone, and optional tools that implement components common to many compositors, such as the arrangement of outputs in physical space.
  • wlroots provides an Xwayland abstraction that allows you to have excellent Xwayland support without worrying about writing your own X11 window manager on top of writing your compositor.
  • wlroots provides a renderer abstraction that simple compositors can use to avoid writing GL code directly, but which steps out of the way when your needs demand custom rendering code.

wlroots implements a huge variety of Wayland compositor features and implements them right, so you can focus on the features that make your compositor unique. By using wlroots, you get high performance, excellent hardware compatibility, broad support for many wayland interfaces, and comfortable development tools - or any subset of these features you like, because all of them work independently of one another and freely compose with anything you want to implement yourself.

Check out our wiki to get started with wlroots. Join our IRC channel: #sway-devel on Libera Chat.

A variety of wrapper libraries are available for using it with your favorite programming language.

Building

Install dependencies:

  • meson
  • wayland
  • wayland-protocols
  • EGL and GLESv2 (optional, for the GLES2 renderer)
  • Vulkan loader, headers and glslang (optional, for the Vulkan renderer)
  • libdrm
  • GBM (optional, for the GBM allocator)
  • libinput (optional, for the libinput backend)
  • xkbcommon
  • udev
  • pixman
  • libseat

If you choose to enable X11 support:

  • xwayland (build-time only, optional at runtime)
  • libxcb
  • libxcb-render-util
  • libxcb-wm
  • libxcb-errors (optional, for improved error reporting)

Run these commands:

meson build/
ninja -C build/

Install like so:

sudo ninja -C build/ install

Contributing

See CONTRIBUTING.md.