361 lines
8.3 KiB
C++
361 lines
8.3 KiB
C++
/*
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* \brief Framebuffer-to-Nitpicker adapter
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* \author Norman Feske
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* \date 2010-09-09
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*/
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/*
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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 <nitpicker_session/connection.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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struct Main;
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using Genode::Static_root;
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using Genode::Signal_rpc_member;
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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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long config_arg(const char *attr, long default_value)
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{
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long res = default_value;
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try { Genode::config()->xml_node().attribute(attr).value(&res); }
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catch (...) { }
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return res;
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}
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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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Nit_fb::Area const boundary)
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{
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switch (ev.type()) {
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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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case Input::Event::TOUCH:
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{
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Nit_fb::Point abs_pos = Nit_fb::Point(ev.ax(), ev.ay()) -
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input_origin;
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using Genode::min;
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using Genode::max;
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using Input::Event;
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int const ax = min((int)boundary.w() - 1, max(0, abs_pos.x()));
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int const ay = min((int)boundary.h() - 1, max(0, abs_pos.y()));
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if (ev.type() == Event::TOUCH)
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return Event::create_touch_event(ax, ay, ev.code(),
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ev.is_touch_release());
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return Event(ev.type(), ev.code(), ax, ay, 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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/*****************************
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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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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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Genode::Signal_context_capability _sync_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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* 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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Framebuffer::Mode _next_mode;
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/*
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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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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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* 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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_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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/*
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* Keep a component-local copy of the signal capability. Otherwise,
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* NOVA would revoke the capability from further recipients (in this
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* case the nitpicker instance we are using) once we revoke the
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* capability locally.
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*/
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_sync_sigh = sigh;
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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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* Input and framebuffer sessions provided to our client
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*/
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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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* Attach root interfaces to the entry point
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*/
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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.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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* 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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fb_session.mode();
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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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update_view();
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}
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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, fb_session.size()));
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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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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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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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* Apply initial configuration
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*/
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handle_config_update(0);
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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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/************
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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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}
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