weston-screenshooter
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| weston-screenshooter | |
|---|---|
| Name | weston-screenshooter |
| Developer | Wayland community, Weston developers |
| Released | 2013 |
| Operating system | Linux |
| Platform | Wayland |
| License | MIT License |
weston-screenshooter is a lightweight screenshot utility originally distributed with the Weston reference compositor. It provides command-line and keybinding-driven capture of display surfaces running on Wayland compositors and integrates with common Linux desktop environments such as GNOME, KDE, and XFCE. Designed for simplicity and minimal dependencies, it targets users and developers who require fast, compositor-native screen capture without X11 compatibility layers like XWayland.
Overview
weston-screenshooter is part of the tooling ecosystem around Wayland and the Weston project, complementing other utilities and compositors such as sway, Mutter, KWin, Wayfire, and river. The tool emphasizes direct use of Wayland protocols and libweston helpers to capture buffers, avoiding legacy X11 APIs and integration with session managers like systemd-logind. It is distributed alongside demo and reference clients used by projects including Mesa, libinput, wlroots, and wayland-protocols for testing and debugging.
Features and Functionality
weston-screenshooter offers options for full-screen, region, and focused-surface capture, suitable for workflows involving GNOME Shell, KDE Plasma, Enlightenment, and LXQt. It can output to common image formats supported by libpng, libjpeg, and ImageMagick toolsets used in Ubuntu, Debian, Fedora, and Arch Linux distributions. The utility supports keyboard shortcut activation frequently bound via xdg-desktop-portal frontends in ecosystems like Flatpak and integrates with notification daemons such as D-Bus-based services found in Freedesktop.org-aligned desktops.
Usage and Command-line Options
Typical invocation uses a small set of options tailored to developers and system integrators working with Weston or wlroots-based compositors such as sway and river. Common switches enable selection between copying to clipboard via data device mechanisms, saving to files named for the system clock consistent with POSIX time, or piping into image processors like ImageMagick or ffmpeg. Scripted use in cron-like automation or systemd timers leverages predictable exit codes and stderr messages parsed by tools used in GitLab CI/CD, Jenkins, or Travis CI for continuous integration testing of graphical builds.
Implementation and Architecture
Implemented in C atop Wayland client libraries, weston-screenshooter interacts with compositor protocols including wl_shm, xdg-shell, and optional protocols from wayland-protocols extensions. Its buffer management uses shared memory pools configured similarly to clients in Mesa and integrates with allocator strategies akin to gbm and DRI patterns present in Intel and AMD driver stacks. The codebase follows patterns used in Weston demo clients and provides a concise reference for buffer mapping, pixel-format handling, and conversion routines compatible with image libraries used in GIMP and Inkscape workflows.
Integration with Wayland Compositors
As a reference client, weston-screenshooter is compatible with a range of compositors including Weston, sway, Mutter, KWin, Wayfire, and river. Integration approaches vary: some compositors expose compositor-specific protocols or portals via xdg-desktop-portal that change how clipboard and file dialogs operate in Flatpak contexts, while others require compositor-specific keybinding configuration found in sway config files or KWin scripts. Downstream desktop distributions such as Fedora, Ubuntu, and Arch Linux adapt packaging to align screenshots with compositor conventions and system services like Logind and Polkit.
Development and Maintenance
Development occurs in repositories maintained by Weston contributors and community members collaborating via platforms like GitHub and GitLab. Contributors include maintainers from organizations such as Red Hat, Intel, Collabora, and independent developers active in freedesktop.org lists. The maintenance cycle follows the release cadence of the Weston project, with patches submitted through merge requests and code review practices observed by projects like GNOME and KDE. Testing and continuous integration harnesses build systems like Meson and CMake, and uses artifacts validated on distributions including Debian, Fedora, and openSUSE.
Security and Privacy Considerations
Because weston-screenshooter captures pixel buffers and can interact with clipboard and file systems in Linux environments, integration with session security components such as xdg-desktop-portal, Polkit, and systemd-logind affects its privacy posture. Compositors may implement permission models or sandboxing—common in Flatpak and Snapcraft workflows—to restrict capture by untrusted clients. When deployed in multi-user systems like Ubuntu servers or shared workstations in enterprises using Active Directory or FreeIPA, administrators should consider compositor policies and file permissions to prevent unauthorized capture and exfiltration of sensitive screen contents.