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Sebastian Wick f3026c916e protocol: specify the exact form of premultiplication 
There are two ways to do pre-multiplication of the alpha channel into
the color channels: on optical values or on electrical values. While
pre-multiplication with optical values is arguably more correct, because
operations like blending or scaling require pre-multiplied, optical
color channels, wayland and compositors by default work with
pre-multiplied electrical values. This is most likely a convention that
Wayland took from Cairo.

This commit makes sure that the expectation of pre-multiplied electrical
values is properly documented.

Signed-off-by: Sebastian Wick <sebastian.wick@redhat.com>
2023-05-09 14:52:58 +02:00
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doc Document which type are nullable, and wire format for null value 2022-07-14 08:38:49 -07:00
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protocol protocol: specify the exact form of premultiplication 2023-05-09 14:52:58 +02:00
src build: override wayland-scanner dep 2023-05-09 09:56:18 +00:00
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meson_options.txt meson: Use proper type for bools 2022-04-02 17:04:08 +03:00
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README.md

Wayland

Wayland is a project to define a protocol for a compositor to talk to its clients as well as a library implementation of the protocol. The compositor can be a standalone display server running on Linux kernel modesetting and evdev input devices, an X application, or a wayland client itself. The clients can be traditional applications, X servers (rootless or fullscreen) or other display servers.

The wayland protocol is essentially only about input handling and buffer management. The compositor receives input events and forwards them to the relevant client. The clients creates buffers and renders into them and notifies the compositor when it needs to redraw. The protocol also handles drag and drop, selections, window management and other interactions that must go through the compositor. However, the protocol does not handle rendering, which is one of the features that makes wayland so simple. All clients are expected to handle rendering themselves, typically through cairo or OpenGL.

Building the wayland libraries is fairly simple, aside from libffi, they don't have many dependencies:

$ git clone https://gitlab.freedesktop.org/wayland/wayland
$ cd wayland
$ meson build/ --prefix=PREFIX
$ ninja -C build/ install

where PREFIX is where you want to install the libraries.

See https://wayland.freedesktop.org for documentation.