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nit_fb: use server API, make resizeable
This patch reimplements the nit_fb server using the server API and thereby enables the dynamic resizing the of the framebuffer. Note that the new implementation does not feature the ability to perform a periodic refresh via the 'refresh_rate' configuration argument. This feature was removed because the refresh policy can (and should) always be implemented on the client side.
This commit is contained in:
Norman Feske
parent
d3eac95ac5
commit
905ca7bf3f
@ -5,7 +5,5 @@ virtual frame buffers on one physical screen. The size and screen position
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of each 'nit_fb' instance can be defined via Genode's configuration mechansim
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using the following attributes of the 'nit_fb' config node:
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! <config xpos="100" ypos="150" width="300" height="200" refresh_rate="25"/>
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! <config xpos="100" ypos="150" width="300" height="200" />
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If 'refresh_rate' isn't set the server will not trigger any refresh operations
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by itself.
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@ -5,112 +5,40 @@
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*/
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/*
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* Copyright (C) 2010-2013 Genode Labs GmbH
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* Copyright (C) 2010-2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/sleep.h>
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#include <cap_session/connection.h>
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#include <nitpicker_session/connection.h>
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#include <dataspace/client.h>
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#include <input_session/input_session.h>
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#include <input/component.h>
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#include <os/surface.h>
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#include <input/event.h>
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#include <os/config.h>
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#include <os/static_root.h>
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#include <os/server.h>
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#include <os/attached_dataspace.h>
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#include <timer_session/connection.h>
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namespace Nit_fb {
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namespace Input {
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struct Main;
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/**
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* Input session applying a position offset to absolute motion events
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*/
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class Session_component : public Genode::Rpc_object<Session>
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{
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private:
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using Genode::Static_root;
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using Genode::Signal_rpc_member;
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/**
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* Offset to be applied to absolute motion events
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*/
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int _dx, _dy;
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/**
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* Input session, from which we fetch events
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*/
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Input::Session *_from_input;
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Genode::Dataspace_capability _from_input_ds;
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Genode::size_t _from_ev_buf_size;
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Input::Event *_from_ev_buf;
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/**
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* Input session, to which to provide events
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*/
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Genode::Dataspace_capability _to_input_ds;
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Input::Event *_to_ev_buf;
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/**
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* Shortcut for mapping an event buffer locally
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*/
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Input::Event *_map_ev_buf(Genode::Dataspace_capability ds_cap) {
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return Genode::env()->rm_session()->attach(ds_cap); }
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public:
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/**
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* Constructor
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*
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* \param dx, dy offset to be added to absolute motion events
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* \param from_input input session from where to get input events
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*/
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Session_component(int dx, int dy, Input::Session *from_input)
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:
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_dx(dx), _dy(dy),
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_from_input(from_input),
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_from_input_ds(from_input->dataspace()),
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_from_ev_buf_size(Genode::Dataspace_client(_from_input_ds).size()),
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_from_ev_buf(_map_ev_buf(_from_input_ds)),
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_to_input_ds(Genode::env()->ram_session()->alloc(_from_ev_buf_size)),
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_to_ev_buf(_map_ev_buf(_to_input_ds))
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{ }
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/*****************************
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** Input session interface **
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*****************************/
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Genode::Dataspace_capability dataspace() override { return _to_input_ds; }
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bool is_pending() const override { return _from_input->is_pending(); }
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int flush() override
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{
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/* flush events at input session */
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int num_events = _from_input->flush();
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/* copy events from input buffer to client buffer */
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for (int i = 0; i < num_events; i++) {
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Input::Event e = _from_ev_buf[i];
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/* apply view offset to absolute motion events */
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if (e.is_absolute_motion())
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e = Event(e.type(), e.code(),
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e.ax() + _dx, e.ay() + _dy, 0, 0);
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_to_ev_buf[i] = e;
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}
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return num_events;
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}
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void sigh(Genode::Signal_context_capability sigh) override
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{
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_from_input->sigh(sigh);
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}
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};
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typedef Genode::Surface_base::Point Point;
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typedef Genode::Surface_base::Area Area;
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typedef Genode::Surface_base::Rect Rect;
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}
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/***************
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** Utilities **
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***************/
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/**
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* Read integer value from config attribute
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*/
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@ -123,139 +51,286 @@ long config_arg(const char *attr, long default_value)
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}
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struct Config_args
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/**
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* Translate input event
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*/
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static Input::Event translate_event(Input::Event const ev,
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Nit_fb::Point const input_origin)
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{
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long xpos, ypos, width, height;
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unsigned refresh_rate;
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switch (ev.type()) {
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Config_args()
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:
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xpos(config_arg("xpos", 0)),
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ypos(config_arg("ypos", 0)),
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width(config_arg("width", 0)),
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height(config_arg("height", 0)),
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refresh_rate(config_arg("refresh_rate", 0))
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{ }
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case Input::Event::MOTION:
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case Input::Event::PRESS:
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case Input::Event::RELEASE:
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case Input::Event::FOCUS:
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case Input::Event::LEAVE:
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{
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Nit_fb::Point abs_pos = Nit_fb::Point(ev.ax(), ev.ay()) + input_origin;
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return Input::Event(ev.type(), ev.code(),
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abs_pos.x(), abs_pos.y(), 0, 0);
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}
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case Input::Event::INVALID:
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case Input::Event::WHEEL:
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return ev;
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}
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return Input::Event();
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}
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struct View_updater
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{
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virtual void update_view() = 0;
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};
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int main(int argc, char **argv)
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/*****************************
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** Virtualized framebuffer **
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*****************************/
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namespace Framebuffer { struct Session_component; }
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struct Framebuffer::Session_component : Genode::Rpc_object<Framebuffer::Session>
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{
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using namespace Genode;
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Nitpicker::Connection &_nitpicker;
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Framebuffer::Session &_nit_fb = *_nitpicker.framebuffer();
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Genode::Signal_context_capability _mode_sigh;
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View_updater &_view_updater;
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Framebuffer::Mode::Format _format = _nitpicker.mode().format();
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/*
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* Read arguments from config
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* Mode as requested by the configuration or by a mode change of our
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* nitpicker session.
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*/
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Config_args cfg;
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long view_x = cfg.xpos, view_y = cfg.ypos,
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view_w = cfg.width, view_h = cfg.height;
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Framebuffer::Mode _next_mode;
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/*
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* Open Nitpicker session
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* Mode that was returned to the client at the last call of
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* 'Framebuffer:mode'. The virtual framebuffer must correspond to this
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* mode. The variable is mutable because it is changed as a side effect of
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* calling the const 'mode' function.
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*/
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static Nitpicker::Connection nitpicker;
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Framebuffer::Mode mutable _active_mode = _next_mode;
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bool _dataspace_is_new = true;
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/**
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* Constructor
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*/
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Session_component(Nitpicker::Connection &nitpicker,
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View_updater &view_updater,
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Framebuffer::Mode initial_mode)
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:
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_nitpicker(nitpicker), _view_updater(view_updater),
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_next_mode(initial_mode)
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{ }
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void size(Nitpicker::Area size)
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{
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/* ignore calls that don't change the size */
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if (Nitpicker::Area(_next_mode.width(), _next_mode.height()) == size)
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return;
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_next_mode = Framebuffer::Mode(size.w(), size.h(), _next_mode.format());
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if (_mode_sigh.valid())
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Genode::Signal_transmitter(_mode_sigh).submit();
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}
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Nitpicker::Area size() const
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{
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return Nitpicker::Area(_active_mode.width(), _active_mode.height());
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}
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/************************************
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** Framebuffer::Session interface **
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************************************/
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Genode::Dataspace_capability dataspace() override
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{
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_nitpicker.buffer(_active_mode, false);
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/*
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* If no config was provided, use screen size of Nitpicker
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* We defer the update of the view until the client calls refresh the
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* next time. This avoid showing the empty buffer as an intermediate
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* artifact.
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*/
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if (view_w == 0 || view_h == 0) {
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Framebuffer::Mode const mode = nitpicker.mode();
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view_w = mode.width(), view_h = mode.height();
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_dataspace_is_new = true;
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return _nit_fb.dataspace();
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}
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Mode mode() const override
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{
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_active_mode = _next_mode;
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return _active_mode;
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}
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void mode_sigh(Genode::Signal_context_capability sigh) override
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{
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_mode_sigh = sigh;
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}
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void refresh(int x, int y, int w, int h) override
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{
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if (_dataspace_is_new) {
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_view_updater.update_view();
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_dataspace_is_new = false;
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}
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_nit_fb.refresh(x, y, w, h);
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}
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void sync_sigh(Genode::Signal_context_capability sigh) override
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{
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_nit_fb.sync_sigh(sigh);
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}
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};
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/******************
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** Main program **
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******************/
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struct Nit_fb::Main : View_updater
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{
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Server::Entrypoint &ep;
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Nitpicker::Connection nitpicker;
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Point position;
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unsigned refresh_rate = 0;
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Nitpicker::Session::View_handle view = nitpicker.create_view();
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Genode::Attached_dataspace input_ds { nitpicker.input()->dataspace() };
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Framebuffer::Mode _initial_mode()
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{
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return Framebuffer::Mode(config_arg("width", nitpicker.mode().width()),
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config_arg("height", nitpicker.mode().height()),
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nitpicker.mode().format());
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}
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/*
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* Setup virtual framebuffer
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* Input and framebuffer sessions provided to our client
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*/
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Framebuffer::Mode const mode(view_w, view_h, Framebuffer::Mode::RGB565);
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nitpicker.buffer(mode, false);
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PINF("using xywh=(%ld,%ld,%ld,%ld) refresh_rate=%u",
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view_x, view_y, view_w, view_h, cfg.refresh_rate);
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Input::Session_component input_session;
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Framebuffer::Session_component fb_session { nitpicker, *this, _initial_mode() };
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/*
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* Create Nitpicker view and bring it to front
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* Attach root interfaces to the entry point
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*/
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Nitpicker::Session::View_handle view = nitpicker.create_view();
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Static_root<Input::Session> input_root { ep.manage(input_session) };
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Static_root<Framebuffer::Session> fb_root { ep.manage(fb_session) };
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/**
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* View_updater interface
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*/
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void update_view() override
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{
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typedef Nitpicker::Session::Command Command;
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Nitpicker::Rect geometry(Nitpicker::Point(view_x, view_y),
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Nitpicker::Area(view_w, view_h));
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nitpicker.enqueue<Command::Geometry>(view, geometry);
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nitpicker.enqueue<Command::Geometry>(view, Rect(position,
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fb_session.size()));
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nitpicker.enqueue<Command::To_front>(view);
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nitpicker.execute();
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}
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void handle_config_update(unsigned)
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{
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Genode::config()->reload();
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Framebuffer::Mode const nit_mode = nitpicker.mode();
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position = Point(config_arg("xpos", 0),
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config_arg("ypos", 0));
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fb_session.size(Area(config_arg("width", nit_mode.width()),
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config_arg("height", nit_mode.height())));
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/*
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* Initialize server entry point
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* Simulate a client call Framebuffer::Session::mode to make the
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* initial mode the active mode.
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*/
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enum { STACK_SIZE = 4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "nitfb_ep");
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fb_session.mode();
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/*
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* Let the entry point serve the framebuffer and input root interfaces
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*/
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static Static_root<Framebuffer::Session> fb_root(nitpicker.framebuffer_session());
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PINF("using xywh=(%d,%d,%d,%d)",
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position.x(), position.x(),
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fb_session.size().w(), fb_session.size().h());
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/*
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* Pre-initialize single client input session
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*/
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static Input::Session_client nit_input(nitpicker.input_session());
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static Input::Session_component input_session(-view_x, -view_y, &nit_input);
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update_view();
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}
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/*
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* Attach input root interface to the entry point
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Signal_rpc_member<Main> config_update_dispatcher =
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{ ep, *this, &Main::handle_config_update};
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void handle_mode_update(unsigned)
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{
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Framebuffer::Mode const nit_mode = nitpicker.mode();
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fb_session.size(Area(nit_mode.width(), nit_mode.height()));
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}
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Signal_rpc_member<Main> mode_update_dispatcher =
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{ ep, *this, &Main::handle_mode_update};
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void handle_input(unsigned)
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{
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Input::Event const * const events = input_ds.local_addr<Input::Event>();
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unsigned const num = nitpicker.input()->flush();
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for (unsigned i = 0; i < num; i++)
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input_session.submit(translate_event(events[i], position));
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}
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Signal_rpc_member<Main> input_dispatcher =
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{ ep, *this, &Main::handle_input};
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/**
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* Constructor
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*/
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static Static_root<Input::Session> input_root(ep.manage(&input_session));
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Main(Server::Entrypoint &ep) : ep(ep)
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{
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input_session.event_queue().enabled(true);
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/*
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* Announce services
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*/
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env()->parent()->announce(ep.manage(&fb_root));
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env()->parent()->announce(ep.manage(&input_root));
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Genode::env()->parent()->announce(ep.manage(fb_root));
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Genode::env()->parent()->announce(ep.manage(input_root));
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/*
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* Register signal handler for config changes
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* Apply initial configuration
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*/
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Signal_receiver sig_rec;
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Signal_context sig_ctx;
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config()->sigh(sig_rec.manage(&sig_ctx));
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handle_config_update(0);
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for (;;) {
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bool reload_config = false;
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if (!cfg.refresh_rate) {
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sig_rec.wait_for_signal();
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reload_config = true;
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} else {
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static Timer::Connection timer;
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static Framebuffer::Session_client nit_fb(nitpicker.framebuffer_session());
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timer.msleep(cfg.refresh_rate);
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nit_fb.refresh(0, 0, view_w, view_h);
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if (sig_rec.pending()) {
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sig_rec.wait_for_signal();
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reload_config = true;
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}
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/*
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* Register signal handlers
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*/
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Genode::config()->sigh(config_update_dispatcher);
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nitpicker.mode_sigh(mode_update_dispatcher);
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nitpicker.input()->sigh(input_dispatcher);
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}
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};
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if (reload_config) {
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try {
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config()->reload();
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cfg = Config_args();
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Nitpicker::Rect geometry(Nitpicker::Point(cfg.xpos, cfg.ypos),
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Nitpicker::Area(cfg.width, cfg.height));
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nitpicker.enqueue<Command::Geometry>(view, geometry);
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nitpicker.execute();
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} catch (...) {
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PERR("Error while reloading config");
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}
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}
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}
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return 0;
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/************
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** Server **
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************/
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namespace Server {
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char const *name() { return "nit_fb_ep"; }
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size_t stack_size() { return 4*1024*sizeof(long); }
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void construct(Entrypoint &ep) { static Nit_fb::Main inst(ep); }
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}
|
||||
|
||||
|
||||
@ -1,3 +1,3 @@
|
||||
TARGET = nit_fb
|
||||
SRC_CC = main.cc
|
||||
LIBS = base config
|
||||
LIBS = base config server
|
||||
|
||||
Loading…
Reference in New Issue
Block a user