157 lines
4.0 KiB
C++
157 lines
4.0 KiB
C++
/*
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* \brief Framebuffer session interface
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* \author Norman Feske
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* \date 2006-07-10
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*/
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/*
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* Copyright (C) 2006-2017 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 Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__FRAMEBUFFER_SESSION__FRAMEBUFFER_SESSION_H_
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#define _INCLUDE__FRAMEBUFFER_SESSION__FRAMEBUFFER_SESSION_H_
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#include <base/output.h>
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#include <base/signal.h>
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#include <dataspace/capability.h>
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#include <session/session.h>
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namespace Framebuffer {
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struct Mode;
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struct Session;
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struct Session_client;
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}
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/**
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* Framebuffer mode info as returned by 'Framebuffer::Session::mode()'
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*/
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struct Framebuffer::Mode
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{
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public:
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/**
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* Pixel formats
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*/
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enum Format { INVALID, RGB565 };
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static Genode::size_t bytes_per_pixel(Format format)
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{
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if (format == RGB565) return 2;
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return 0;
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}
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private:
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int _width, _height;
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Format _format;
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public:
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Mode() : _width(0), _height(0), _format(INVALID) { }
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Mode(int width, int height, Format format)
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: _width(width), _height(height), _format(format) { }
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int width() const { return _width; }
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int height() const { return _height; }
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Format format() const { return _format; }
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/**
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* Return number of bytes per pixel
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*/
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Genode::size_t bytes_per_pixel() const {
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return bytes_per_pixel(_format); }
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void print(Genode::Output &out) const
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{
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Genode::print(out, _width, "x", _height, "@");
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switch (_format) {
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case RGB565: Genode::print(out, "RGB565"); break;
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default: Genode::print(out, "INVALID"); break;
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}
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}
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};
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struct Framebuffer::Session : Genode::Session
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{
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/**
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* \noapi
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*/
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static const char *service_name() { return "Framebuffer"; }
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/*
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* A framebuffer session consumes a dataspace capability for the server's
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* session-object allocation, a dataspace capability for the framebuffer
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* dataspace, and its session capability.
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*/
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enum { CAP_QUOTA = 3 };
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typedef Session_client Client;
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virtual ~Session() { }
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/**
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* Request dataspace representing the logical frame buffer
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*
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* By calling this method, the framebuffer client enables the server
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* to reallocate the framebuffer dataspace (e.g., on mode changes).
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* Hence, prior calling this method, the client should make sure to
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* have detached the previously requested dataspace from its local
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* address space.
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*/
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virtual Genode::Dataspace_capability dataspace() = 0;
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/**
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* Request display-mode properties of the framebuffer ready to be
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* obtained via the 'dataspace()' method
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*/
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virtual Mode mode() const = 0;
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/**
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* Register signal handler to be notified on mode changes
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*
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* The framebuffer server may support changing the display mode on the
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* fly. For example, a virtual framebuffer presented in a window may
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* get resized according to the window dimensions. By installing a
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* signal handler for mode changes, the framebuffer client can respond
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* to such changes. The new mode can be obtained using the 'mode()'
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* method. However, from the client's perspective, the original mode
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* stays in effect until the it calls 'dataspace()' again.
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*/
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virtual void mode_sigh(Genode::Signal_context_capability sigh) = 0;
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/**
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* Flush specified pixel region
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*
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* \param x,y,w,h region to be updated on physical frame buffer
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*/
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virtual void refresh(int x, int y, int w, int h) = 0;
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/**
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* Register signal handler for refresh synchronization
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*/
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virtual void sync_sigh(Genode::Signal_context_capability) = 0;
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/*********************
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** RPC declaration **
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*********************/
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GENODE_RPC(Rpc_dataspace, Genode::Dataspace_capability, dataspace);
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GENODE_RPC(Rpc_mode, Mode, mode);
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GENODE_RPC(Rpc_refresh, void, refresh, int, int, int, int);
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GENODE_RPC(Rpc_mode_sigh, void, mode_sigh, Genode::Signal_context_capability);
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GENODE_RPC(Rpc_sync_sigh, void, sync_sigh, Genode::Signal_context_capability);
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GENODE_RPC_INTERFACE(Rpc_dataspace, Rpc_mode, Rpc_mode_sigh, Rpc_refresh,
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Rpc_sync_sigh);
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};
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#endif /* _INCLUDE__FRAMEBUFFER_SESSION__FRAMEBUFFER_SESSION_H_ */
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