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In practice, not all callbacks defined by a wl_interface are needed by every client or server. For instance, a client may only care about a subset of events on an object and leave the rest unhandled. Previously, a NULL implementation or a NULL listener function for a specific opcode would cause a fatal wl_abort(), forcing users to provide stub callbacks for every opcode even when they had nothing to do. This made code unnecessarily verbose. Downgrade the abort to a wl_log() warning and return early after cleaning up file descriptors. This allows partial interface implementations, simplifying user code while still logging a diagnostic message for debugging. Signed-off-by: Jie Liu <liujie01@kylinos.cn> |
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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.