genode/repos/os/include/framebuffer_session/framebuffer_session.h
2015-03-13 12:17:23 +01:00

134 lines
3.5 KiB
C++

/*
* \brief Framebuffer session interface
* \author Norman Feske
* \date 2006-07-10
*/
/*
* Copyright (C) 2006-2013 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__FRAMEBUFFER_SESSION_H_
#define _INCLUDE__FRAMEBUFFER_SESSION__FRAMEBUFFER_SESSION_H_
#include <base/signal.h>
#include <dataspace/capability.h>
#include <session/session.h>
namespace Framebuffer {
struct Mode;
struct Session;
}
/**
* Framebuffer mode info as returned by 'Framebuffer::Session::mode()'
*/
struct Framebuffer::Mode
{
public:
/**
* Pixel formats
*/
enum Format { INVALID, RGB565 };
static Genode::size_t bytes_per_pixel(Format format)
{
if (format == RGB565) return 2;
return 0;
}
private:
int _width, _height;
Format _format;
public:
Mode() : _width(0), _height(0), _format(INVALID) { }
Mode(int width, int height, Format format)
: _width(width), _height(height), _format(format) { }
int width() const { return _width; }
int height() const { return _height; }
Format format() const { return _format; }
/**
* Return number of bytes per pixel
*/
Genode::size_t bytes_per_pixel() const {
return bytes_per_pixel(_format); }
};
struct Framebuffer::Session : Genode::Session
{
static const char *service_name() { return "Framebuffer"; }
virtual ~Session() { }
/**
* Request dataspace representing the logical frame buffer
*
* By calling this function, the framebuffer client enables the server
* to reallocate the framebuffer dataspace (e.g., on mode changes).
* Hence, prior calling this function, the client should make sure to
* have detached the previously requested dataspace from its local
* address space.
*/
virtual Genode::Dataspace_capability dataspace() = 0;
/**
* Request display-mode properties of the framebuffer ready to be
* obtained via the 'dataspace()' function
*/
virtual Mode mode() const = 0;
/**
* Register signal handler to be notified on mode changes
*
* The framebuffer server may support changing the display mode on the
* fly. For example, a virtual framebuffer presented in a window may
* get resized according to the window dimensions. By installing a
* signal handler for mode changes, the framebuffer client can respond
* to such changes. The new mode can be obtained using the 'mode()'
* function. However, from the client's perspective, the original mode
* stays in effect until the it calls 'dataspace()' again.
*/
virtual void mode_sigh(Genode::Signal_context_capability sigh) = 0;
/**
* Flush specified pixel region
*
* \param x,y,w,h region to be updated on physical frame buffer
*/
virtual void refresh(int x, int y, int w, int h) = 0;
/**
* Register signal handler for refresh synchronization
*/
virtual void sync_sigh(Genode::Signal_context_capability) = 0;
/*********************
** RPC declaration **
*********************/
GENODE_RPC(Rpc_dataspace, Genode::Dataspace_capability, dataspace);
GENODE_RPC(Rpc_mode, Mode, mode);
GENODE_RPC(Rpc_refresh, void, refresh, int, int, int, int);
GENODE_RPC(Rpc_mode_sigh, void, mode_sigh, Genode::Signal_context_capability);
GENODE_RPC(Rpc_sync_sigh, void, sync_sigh, Genode::Signal_context_capability);
GENODE_RPC_INTERFACE(Rpc_dataspace, Rpc_mode, Rpc_mode_sigh, Rpc_refresh,
Rpc_sync_sigh);
};
#endif /* _INCLUDE__FRAMEBUFFER_SESSION__FRAMEBUFFER_SESSION_H_ */