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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2009-2024 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/////////////////////////////////////////////////////////////////////////////
// SDesktop is an interface implemented by back-ends, on which callbacks are
// made by the VNCServer as appropriate for pointer and keyboard events, etc.
// SDesktop objects are always created before the VNCServer - the SDesktop
// will be passed a pointer to the VNCServer in the start() call. If a more
// implementation-specific pointer to the VNCServer is required then this
// can be provided to the SDesktop via an implementation-specific method.
//
// An SDesktop usually has an associated PixelBuffer which it tells the
// VNCServer via the VNCServer's setPixelBuffer() method. It can do this at
// any time, but the PixelBuffer MUST be valid by the time the call to start()
// returns. The PixelBuffer may be set to null again if desired when stop() is
// called. Note that start() and stop() are guaranteed to be called
// alternately; there should never be two calls to start() without an
// intervening stop() and vice-versa.
//
#ifndef __RFB_SDESKTOP_H__
#define __RFB_SDESKTOP_H__
#include <rfb/PixelBuffer.h>
#include <rfb/VNCServer.h>
#include <rfb/InputHandler.h>
#include <rfb/screenTypes.h>
namespace network { class Socket; }
namespace rfb {
class SDesktop : public InputHandler {
public:
// init() is called immediately when the VNCServer gets a reference
// to the SDesktop, so that a reverse reference can be set up.
virtual void init(rfb::VNCServer* vs) = 0;
// start() is called by the server when the first client authenticates
// successfully, and can be used to begin any expensive tasks which are not
// needed when there are no clients. A valid PixelBuffer must have been
// set via the VNCServer's setPixelBuffer() method by the time this call
// returns.
virtual void start() {}
// stop() is called by the server when there are no longer any
// authenticated clients, and therefore the desktop can cease any
// expensive tasks.
virtual void stop() {}
// queryConnection() is called when a connection has been
// successfully authenticated. The sock and userName arguments
// identify the socket and the name of the authenticated user, if
// any. At some point later VNCServer::approveConnection() should
// be called to either accept or reject the client.
virtual void queryConnection(network::Socket* sock,
const char* userName) = 0;
// terminate() is called by the server when it wishes to terminate
// itself, e.g. because it was configured to terminate when no one is
// using it.
virtual void terminate() = 0;
// setScreenLayout() requests to reconfigure the framebuffer and/or
// the layout of screens.
virtual unsigned int setScreenLayout(int /*fb_width*/,
int /*fb_height*/,
const ScreenSet& /*layout*/) {
return resultProhibited;
}
// frameTick() is called whenever a frame update has been processed,
// signalling that a good time to render new data
virtual void frameTick(uint64_t msc) { (void)msc; }
// InputHandler interface
// pointerEvent(), keyEvent() and clientCutText() are called in response to
// the relevant RFB protocol messages from clients.
// See InputHandler for method signatures.
// handleClipboardRequest() is called whenever a client requests
// the server to send over its clipboard data. It will only be
// called after the server has first announced a clipboard change
// via VNCServer::announceClipboard().
virtual void handleClipboardRequest() {}
// handleClipboardAnnounce() is called to indicate a change in the
// clipboard on a client. Call VNCServer::requestClipboard() to
// access the actual data.
virtual void handleClipboardAnnounce(bool /*available*/) {}
// handleClipboardData() is called when a client has sent over
// the clipboard data as a result of a previous call to
// VNCServer::requestClipboard(). Note that this function might
// never be called if the clipboard data was no longer available
// when the client received the request.
virtual void handleClipboardData(const char* /*data*/) {}
protected:
virtual ~SDesktop() {}
};
// -=- SStaticDesktop
// Trivial implementation of the SDesktop interface, which provides
// dummy input handlers and event processing routine, and exports
// a plain black desktop of the specified format.
class SStaticDesktop : public SDesktop {
public:
SStaticDesktop(const Point& size)
: server(nullptr), buffer(nullptr)
{
PixelFormat pf;
const uint8_t black[4] = { 0, 0, 0, 0 };
buffer = new ManagedPixelBuffer(pf, size.x, size.y);
if (buffer)
buffer->fillRect(buffer->getRect(), black);
}
SStaticDesktop(const Point& size, const PixelFormat& pf)
: buffer(nullptr)
{
const uint8_t black[4] = { 0, 0, 0, 0 };
buffer = new ManagedPixelBuffer(pf, size.x, size.y);
if (buffer)
buffer->fillRect(buffer->getRect(), black);
}
virtual ~SStaticDesktop() {
if (buffer) delete buffer;
}
virtual void init(VNCServer* vs) {
server = vs;
server->setPixelBuffer(buffer);
}
virtual void queryConnection(network::Socket* sock,
const char* /*userName*/) {
server->approveConnection(sock, true, nullptr);
}
protected:
VNCServer* server;
ManagedPixelBuffer* buffer;
};
};
#endif // __RFB_SDESKTOP_H__
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