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6b42f8b54e
This patch adds support for the consecutive re-dimensioning the virtual framebuffer. When changing the buffer size, the session gets upgraded by the missing portion of the quota instead of donating the whole size of the new buffer each time.
107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
/*
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* \brief Connection to Nitpicker 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) 2008-2013 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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#ifndef _INCLUDE__NITPICKER_SESSION__CONNECTION_H_
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#define _INCLUDE__NITPICKER_SESSION__CONNECTION_H_
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#include <nitpicker_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 Nitpicker { class Connection; }
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class Nitpicker::Connection : public Genode::Connection<Session>,
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public Session_client
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{
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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(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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enum { SESSION_METADATA = 36*1024 };
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Arg_string::set_arg(argbuf, sizeof(argbuf), "ram_quota", SESSION_METADATA);
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return session(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(char const *label = "")
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:
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/* establish nitpicker session */
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Genode::Connection<Session>(_connect(label)),
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Session_client(cap()),
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/* request frame-buffer and input sub sessions */
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_framebuffer(framebuffer_session()),
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_input(input_session())
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{ }
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void buffer(Framebuffer::Mode mode, bool use_alpha)
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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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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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Genode::Arg_string::set_arg(argbuf, sizeof(argbuf), "ram_quota",
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upgrade);
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Genode::env()->parent()->upgrade(cap(), argbuf);
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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 Nitpicker's input service
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*/
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Input::Session *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__NITPICKER_SESSION__CONNECTION_H_ */
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