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9e3ecade16
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.
128 lines
3.7 KiB
C++
128 lines
3.7 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) 2008-2012 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__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 {
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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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Framebuffer::Session_client _framebuffer;
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Input::Session_client _input;
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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
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_connect(unsigned width, unsigned height, bool alpha,
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Framebuffer::Mode::Format format, bool stay_top)
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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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argbuf[0] = 0;
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/* by default, donate as much as needed for a 1024x768 RGB565 screen */
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Genode::size_t ram_quota = 1600*1024;
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/*
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* NOTE: When specifying an INVALID mode as argument, we could
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* probe for any valid video mode. For now, we just probe for
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* RGB565.
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*/
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if (format == Framebuffer::Mode::INVALID)
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format = Framebuffer::Mode::RGB565;
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/* if buffer dimensions are specified, calculate ram quota to donate */
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if (width && height)
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ram_quota = width*height*Framebuffer::Mode::bytes_per_pixel(format);
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/* account for alpha and input-mask buffers */
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if (alpha)
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ram_quota += width*height*2;
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/* add quota for storing server-side meta data */
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enum { SESSION_METADATA = 16*1024 };
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ram_quota += SESSION_METADATA;
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/* declare ram-quota donation */
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Arg_string::set_arg(argbuf, sizeof(argbuf), "ram_quota", ram_quota);
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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 != Framebuffer::Mode::INVALID)
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Arg_string::set_arg(argbuf, sizeof(argbuf), "fb_format", format);
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if (alpha)
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Arg_string::set_arg(argbuf, sizeof(argbuf), "alpha", "yes");
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if (stay_top)
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Arg_string::set_arg(argbuf, sizeof(argbuf), "stay_top", "yes");
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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 buffer width
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* \param height desired buffer height
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* \param alpha true for using a buffer with alpha channel
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* \param format desired pixel format
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*
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* The specified value for 'format' is not enforced. After creating
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* the session, you should validate the actual pixel format of the
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* buffer by its 'mode'.
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*/
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Connection(unsigned width = 0, unsigned height = 0, bool alpha = false,
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Framebuffer::Mode::Format format = Framebuffer::Mode::INVALID,
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bool stay_top = false)
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:
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/* establish nitpicker session */
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Genode::Connection<Session>(_connect(width, height, alpha,
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format, stay_top)),
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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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/**
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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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}
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#endif /* _INCLUDE__NITPICKER_SESSION__CONNECTION_H_ */
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