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As a preliminary step for working on issue #11, this patch revisits the 'Framebuffer::info' RPC call. Instead of using C-style out paramters, the new 'mode()' RPC call returns the mode information as an object of type 'Mode'. Consequently, mode-specific functions such as 'bytes_per_pixel' have been moved to the new 'Framebuffer::Mode' class.
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/*
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* \brief Connection to frame-buffer 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) 2008-2012 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__FRAMEBUFFER_SESSION__CONNECTION_H_
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#define _INCLUDE__FRAMEBUFFER_SESSION__CONNECTION_H_
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#include <framebuffer_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 Framebuffer {
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class 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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/**
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* Create session and return typed session capability
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*/
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Session_capability _connect(unsigned width, unsigned height,
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Mode::Format format)
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{
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using namespace Genode;
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enum { ARGBUF_SIZE = 128 };
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char argbuf[ARGBUF_SIZE];
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/* donate ram quota for storing server-side meta data */
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strncpy(argbuf, "ram_quota=8K", sizeof(argbuf));
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/* set optional session-constructor arguments */
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if (width)
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Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_width", width);
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if (height)
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Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_height", height);
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if (format != Mode::INVALID)
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Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_format", format);
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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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* \param width desired frame-buffer width
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* \param height desired frame-buffer height
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* \param mode desired pixel format
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*
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* The specified values are not enforced. After creating the
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* session, you should validate the actual frame-buffer attributes
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* by calling the 'info' function of the frame-buffer interface.
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*/
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Connection(unsigned width = 0,
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unsigned height = 0,
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Mode::Format format = Mode::INVALID)
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:
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Genode::Connection<Session>(_connect(width, height, format)),
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Session_client(cap())
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{ }
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};
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}
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#endif /* _INCLUDE__FRAMEBUFFER_SESSION__CONNECTION_H_ */
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