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nitpicker: updated README

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Norman Feske 2020-08-26 11:15:31 +02:00 committed by Christian Helmuth
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repos/os/src/server/nitpicker/README
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@ -5,6 +5,17 @@ please refer to the following document:
[http://genode-labs.com/publications/nitpicker-secure-gui-2005.pdf]
The Nitpicker GUI server serves as a broker between input drivers, framebuffer
drivers, and applications. For each of these component types, it provides a
dedicated service interface. Input drivers connect to the "Event" service,
framebuffer drivers to the "Capture" service, and applications to the "Gui"
service. Hence, its '<start>' node should normally be equipped with the
following declaration about the provided services.
! <provides>
! <service name="Gui"/> <service name="Capture"/> <service name="Event"/>
! </provides>
Nitpicker supports the following configuration options, supplied via Genode's
config mechanism.
@ -231,3 +242,13 @@ The 'keystate' attribute enables the reporting of the currently pressed keys.
The 'clicked' attribute enables the reporting of the last clicked-on unfocused
client. This report is useful for a focus-managing component to implement a
focus-on-click policy.
Cascaded usage scenarios
~~~~~~~~~~~~~~~~~~~~~~~~
Nitpicker can be used in a nested fashion by specifying the '<config>'
attributes 'request_framebuffer="yes"' and 'request_input="yes". If
specified, nitpicker requests sessions to an "Input" and a "Framebuffer"
service upon startup and uses those as input/output back end. Those services
are usually provided by the gui_fb component.