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103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
/*
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* \brief Connection to GUI service
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* \author Norman Feske
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* \date 2008-08-22
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*/
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/*
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* Copyright (C) 2008-2017 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 Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__GUI_SESSION__CONNECTION_H_
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#define _INCLUDE__GUI_SESSION__CONNECTION_H_
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#include <gui_session/client.h>
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#include <framebuffer_session/client.h>
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#include <input_session/client.h>
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#include <util/arg_string.h>
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#include <base/connection.h>
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namespace Gui { class Connection; }
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class Gui::Connection : public Genode::Connection<Session>,
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public Session_client
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{
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public:
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enum { RAM_QUOTA = 36*1024UL };
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private:
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Framebuffer::Session_client _framebuffer;
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Input::Session_client _input;
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Genode::size_t _session_quota = 0;
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/**
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* Create session and return typed session capability
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*/
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Session_capability _connect(Genode::Parent &parent, char const *label)
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{
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enum { ARGBUF_SIZE = 128 };
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char argbuf[ARGBUF_SIZE];
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argbuf[0] = 0;
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if (Genode::strlen(label) > 0)
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Genode::snprintf(argbuf, sizeof(argbuf), "label=\"%s\"", label);
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/*
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* Declare ram-quota donation
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*/
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using Genode::Arg_string;
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Arg_string::set_arg(argbuf, sizeof(argbuf), "ram_quota", RAM_QUOTA);
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Arg_string::set_arg(argbuf, sizeof(argbuf), "cap_quota", CAP_QUOTA);
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return session(parent, argbuf);
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}
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public:
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/**
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* Constructor
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*/
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Connection(Genode::Env &env, char const *label = "")
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:
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/* establish nitpicker session */
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Genode::Connection<Session>(env, _connect(env.parent(), label)),
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Session_client(env.rm(), cap()),
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/* request frame-buffer and input sub sessions */
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_framebuffer(framebuffer_session()),
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_input(env.rm(), input_session())
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{ }
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void buffer(Framebuffer::Mode mode, bool use_alpha) override
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{
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Genode::size_t const needed = ram_quota(mode, use_alpha);
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Genode::size_t const upgrade = needed > _session_quota
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? needed - _session_quota
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: 0;
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if (upgrade > 0) {
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this->upgrade_ram(upgrade);
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_session_quota += upgrade;
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}
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Session_client::buffer(mode, use_alpha);
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}
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/**
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* Return sub session for GUI's input service
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*/
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Input::Session_client *input() { return &_input; }
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/**
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* Return sub session for session's frame buffer
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*/
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Framebuffer::Session *framebuffer() { return &_framebuffer; }
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};
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#endif /* _INCLUDE__GUI_SESSION__CONNECTION_H_ */
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