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A modular Wayland compositor library
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John Lindgren 2ec08b38d8 [RFC] vulkan: compensate alpha to better match perceptual blend intent 
The Vulkan renderer performs alpha blending in linear RGB space, which
preserves hue better than blending sRGB-encoded values directly (as the
gles and pixman renderers do), but unfortunately tends to give a
too-bright result when blending dark and light colors.

(In desktop usage, this especially affects dark, semi-transparent
tooltips, which appear significantly more transparent than expected,
affecting readability if light text underneath shows through.)

This is a novel (I think) approach to compensating for this effect by
adjusting the alpha value of the source texture - basically the result
is that dark semi-transparent pixels are made a little more opaque,
while light semi-transparent pixels are made a little more transparent.
Alpha values of 0 and 1 are unchanged.

I am somewhat new to science of color blending (Björn Ottosson's page,
"How software gets color wrong" is very enlightening) but I think this
approach makes at least a little bit of sense theoretically, and the
result seems to me subjectively to be an improvement.

Analysis from an expert on the subject would be greatly appreciated.

v2: compensate alpha in solid color conversions also
v3: un-premultiply average value for solid color conversion
2024-12-14 11:55:03 -05:00
.builds ci: Remove package 'gmake' 2024-07-29 11:39:34 -04:00
.gitlab/issue_templates Add GitLab issue template 2023-10-08 11:29:13 +00:00
backend backend/drm: check buffer format for multi-GPU 2024-11-28 20:27:48 +01:00
docs render: add WLR_RENDER_NO_EXPLICIT_SYNC env var 2024-08-06 17:37:06 +00:00
examples output/render: Drop buffer age from wlr_output_begin_render_pass 2024-08-21 09:45:54 -04:00
include xwayland: fix xdg->xwayland drag-and-drop 2024-12-11 08:51:10 +01:00
protocol meson: use kwargs for wayland deps 2024-11-21 16:46:55 +00:00
render [RFC] vulkan: compensate alpha to better match perceptual blend intent 2024-12-14 11:55:03 -05:00
tinywl tinywl: don't pass time to cursor mode motion handlers 2024-11-23 00:50:28 +03:00
types data-device: reset focused surface when destroyed 2024-12-11 07:15:02 +00:00
util util/time: Move NSEC_PER_SEC to header 2024-11-07 10:22:56 +01:00
xcursor xcursor/wlr_xcursor: properly clean xcursor in case of realloc failure in load_callback 2024-04-18 16:47:07 +02:00
xwayland xwayland: fix xdg->xwayland drag-and-drop 2024-12-11 08:51:10 +01:00
.editorconfig editorconfig: Unset maximum line length for .git 2024-05-25 07:54:58 +00:00
.gitignore gitignore: remove build dir entries 2022-06-14 10:08:54 +02:00
.gitlab-ci.yml ci: add .gitlab-ci.yml 2021-11-01 16:51:18 +01:00
.mailmap .mailmap: add myself 2024-08-05 19:32:24 +03:00
CONTRIBUTING.md Use WLR_PRIVATE for private fields 2024-10-25 07:51:51 +03:00
LICENSE license: add copyright line for all contributors 2023-07-05 10:27:50 +02:00
meson.build meson: require wayland >=1.23.1 2024-11-21 16:46:55 +00:00
meson.options build: rename meson_options.txt to meson.options 2024-11-07 10:53:38 +01:00
README.md backend/drm: use libdisplay-info to parse EDID 2023-02-28 14:44:02 +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: #wlroots 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 (optional, for the session)
  • pixman
  • libseat (optional, for the session)
  • hwdata (optional, for the DRM backend)
  • libdisplay-info (optional, for the DRM backend)
  • libliftoff (optional, for the DRM backend)

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 setup build/
ninja -C build/

Install like so:

sudo ninja -C build/ install

Contributing

See CONTRIBUTING.md.