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

128 lines
3.7 KiB
C++

/*
* \brief Connection to Nitpicker 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__NITPICKER_SESSION__CONNECTION_H_
#define _INCLUDE__NITPICKER_SESSION__CONNECTION_H_
#include <nitpicker_session/client.h>
#include <framebuffer_session/client.h>
#include <input_session/client.h>
#include <util/arg_string.h>
#include <base/connection.h>
namespace Nitpicker {
class Connection : public Genode::Connection<Session>,
public Session_client
{
private:
Framebuffer::Session_client _framebuffer;
Input::Session_client _input;
/**
* Create session and return typed session capability
*/
Session_capability
_connect(unsigned width, unsigned height, bool alpha,
Framebuffer::Mode::Format format, bool stay_top)
{
using namespace Genode;
enum { ARGBUF_SIZE = 128 };
char argbuf[ARGBUF_SIZE];
argbuf[0] = 0;
/* by default, donate as much as needed for a 1024x768 RGB565 screen */
Genode::size_t ram_quota = 1600*1024;
/*
* NOTE: When specifying an INVALID mode as argument, we could
* probe for any valid video mode. For now, we just probe for
* RGB565.
*/
if (format == Framebuffer::Mode::INVALID)
format = Framebuffer::Mode::RGB565;
/* if buffer dimensions are specified, calculate ram quota to donate */
if (width && height)
ram_quota = width*height*Framebuffer::Mode::bytes_per_pixel(format);
/* account for alpha and input-mask buffers */
if (alpha)
ram_quota += width*height*2;
/* add quota for storing server-side meta data */
enum { SESSION_METADATA = 16*1024 };
ram_quota += SESSION_METADATA;
/* declare ram-quota donation */
Arg_string::set_arg(argbuf, sizeof(argbuf), "ram_quota", ram_quota);
/* 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 != Framebuffer::Mode::INVALID)
Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_format", format);
if (alpha)
Arg_string::set_arg(argbuf, sizeof(argbuf), "alpha", "yes");
if (stay_top)
Arg_string::set_arg(argbuf, sizeof(argbuf), "stay_top", "yes");
return session(argbuf);
}
public:
/**
* Constructor
*
* \param width desired buffer width
* \param height desired buffer height
* \param alpha true for using a buffer with alpha channel
* \param format desired pixel format
*
* The specified value for 'format' is not enforced. After creating
* the session, you should validate the actual pixel format of the
* buffer by its 'mode'.
*/
Connection(unsigned width = 0, unsigned height = 0, bool alpha = false,
Framebuffer::Mode::Format format = Framebuffer::Mode::INVALID,
bool stay_top = false)
:
/* establish nitpicker session */
Genode::Connection<Session>(_connect(width, height, alpha,
format, stay_top)),
Session_client(cap()),
/* request frame-buffer and input sub sessions */
_framebuffer(framebuffer_session()),
_input(input_session())
{ }
/**
* Return sub session for Nitpicker's input service
*/
Input::Session *input() { return &_input; }
/**
* Return sub session for session's frame buffer
*/
Framebuffer::Session *framebuffer() { return &_framebuffer; }
};
}
#endif /* _INCLUDE__NITPICKER_SESSION__CONNECTION_H_ */