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In-vehicle infotainment (information and entertainment)
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graphical environment support modules for Weston
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IVI-shell is an alternative shell for Weston, a Wayland display server.
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Window management and application interaction with the display server
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are very different to that of a normal desktop, which is why this is
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a separate shell and not an extension to the desktop-shell suite with
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xdg_shell. As such, applications need to be specifically written to use
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IVI-shell.
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IVI-shell contains two main features:
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- Common layout library for surface, which allow ivi-shell developer
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to develop own shell, linking Common layout library.
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For the time being, the library refers Genivi ilm interface.
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https://at.projects.genivi.org/wiki/display/WIE/Wayland+IVI+Extension+Home
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- Extension protocol; ivi-application to tie wl_surface and a given ID.
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With this ID, shell can identify which wl_surface is drawn by which
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application. In in-vehicle infortainment system, a shell has to update
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a property of a wl_surface. E.g. there may be a use case when vehicle
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starts to move, the wl_surface drawn by Car navigation is expected to
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move top of surfaces.
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The actual software components delivered with Weston are:
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- ivi-application.xml:
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Wayland protocol extension for IVI-applications; the public
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shell protocol (the same concept as xdg_shell).
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Implemented by ivi-shell.so.
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- ivi-shell.so:
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A Weston shell module that implements ivi-application.xml interfaces.
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Loads ivi-layout.so.
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- ivi-layout.so:
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Implements the IVI window management concepts: Screen, Layer,
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Surface, groups of Layers, groups of Surfaces, see:
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https://at.projects.genivi.org/wiki/display/WIE/Summary+of+Layer+manager+APIs
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Offers a stable API for writing IVI-controller modules like
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hmi-controller.so against the IVI concepts. In other words,
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it offers an API to write IVI window manager modules.
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- hmi-controller.so:
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A sample implementation of an IVI-controller module, usually
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replaced by IVI system vendors.
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Uses ivi-layout.so to perform essentially window manager tasks.
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This implementation keeps all window management inside the module,
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while IVI-systems may use another module that exposes all window
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management via Wayland or other protocol for an external process
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to control.
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- ivi-hmi-controller.xml:
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Wayland protocol extension for IVI display control; the private
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shell protocol for weston-ivi-shell-user-interface client
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(the same concept as desktop-shell.xml).
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Implemented by hmi-controller.so, and usually replaced by IVI
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system vendors.
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- weston-ivi-shell-user-interface:
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A sample implementation of an IVI shell helper client, usually
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replaced by IVI system vendors.
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A helper client for basic display content, similar to
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weston-desktop-shell.
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How to compile:
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same as weston. To disable, use option: --disable-ivi-shell for configure.
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How to configure weston.ini:
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reference ini file will be generated in <build_dir>/ivi-shell.
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How to run:
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same as weston. exec weston.
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How to use UI:
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http://lists.freedesktop.org/archives/wayland-devel/attachments/20140625/abbfc064/attachment-0001.png
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