genode/os/include/framebuffer_session/connection.h
2013-01-10 21:44:47 +01:00

77 lines
2.0 KiB
C++

/*
* \brief Connection to frame-buffer service
* \author Norman Feske
* \date 2008-08-22
*/
/*
* Copyright (C) 2008-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__FRAMEBUFFER_SESSION__CONNECTION_H_
#define _INCLUDE__FRAMEBUFFER_SESSION__CONNECTION_H_
#include <framebuffer_session/client.h>
#include <util/arg_string.h>
#include <base/connection.h>
namespace Framebuffer {
class Connection : public Genode::Connection<Session>,
public Session_client
{
private:
/**
* Create session and return typed session capability
*/
Session_capability _connect(unsigned width, unsigned height,
Mode::Format format)
{
using namespace Genode;
enum { ARGBUF_SIZE = 128 };
char argbuf[ARGBUF_SIZE];
/* donate ram quota for storing server-side meta data */
strncpy(argbuf, "ram_quota=8K", sizeof(argbuf));
/* set optional session-constructor arguments */
if (width)
Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_width", width);
if (height)
Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_height", height);
if (format != Mode::INVALID)
Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_format", format);
return session(argbuf);
}
public:
/**
* Constructor
*
* \param width desired frame-buffer width
* \param height desired frame-buffer height
* \param mode desired pixel format
*
* The specified values are not enforced. After creating the
* session, you should validate the actual frame-buffer attributes
* by calling the 'info' function of the frame-buffer interface.
*/
Connection(unsigned width = 0,
unsigned height = 0,
Mode::Format format = Mode::INVALID)
:
Genode::Connection<Session>(_connect(width, height, format)),
Session_client(cap())
{ }
};
}
#endif /* _INCLUDE__FRAMEBUFFER_SESSION__CONNECTION_H_ */