Crate wayland_backend

Backend API for wayland crates

This crate provide low-level APIs for interacting with the Wayland protocol, both client-side and server-side.

Two possible backends are provided by this crate: the system backend (sys module) which relies on the system-provided wayland libraries, and the rust backend (rs module) which is an alternative rust implementation of the protocol. The rust backend is always available, and the system backend is controlled by the client_system and server_system cargo features. The dlopen cargo feature ensures that the system wayland libraries are loaded dynamically at runtime, so that your executable does not link them and can gracefully handle their absence (for example by falling back to X11).

Additionally the default backends are reexported as toplevel client and server modules in this crate. For both client and server, the default backend is the system one if the associated cargo feature is enabled, and the rust one otherwise.

Using these reexports is the recommended way to use the crate:

• If you don’t need the *_system features, an other crate enabling them will not impact your code in any way as both backends have the same API (the system backend only has more methods)
• If your code needs to do FFI, you just need to directly depend on wayland-backend with the appropriate *_system feature enabled, and all the other crates in your dependency tree will automatically use the sys backend.

Both the wayland-client and wayland-server crates follow this principle, so everything will “Just Work” when using them.

Logging

This crate can generate some runtime error message (notably when a protocol error occurs). By default those messages are printed to stderr. If you activate the log cargo feature, they will instead be piped through the log crate.

raw-window-handle integration

This crate can implement HasRawWindowHandle for the client module Backend type if you activate the raw-window-handle feature.

Note that the client_system feature must also be enabled for the implementation to be activated.

Re-exports

• pub extern crate smallvec;
• pub use sys::client;
  client_system
• pub use sys::server;
  server_system

Modules

• protocol
  Types and utilities for manipulating the Wayland protocol
• rs
  Rust implementations of the Wayland backends
• sysclient_system or server_system
  Implementations of the Wayland backends using the system libwayland

Macros

• message
  Helper macro for quickly making a Message