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/* Copyright (C) 2004-2008 Constantin Kaplinsky. All Rights Reserved.
*
* 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.
*/
//
// PollingManager.h
//
#ifndef __POLLINGMANAGER_H__
#define __POLLINGMANAGER_H__
#include <X11/Xlib.h>
#include <rfb/VNCServer.h>
#include <x0vncserver/Image.h>
#include <x0vncserver/XPixelBuffer.h>
#ifdef DEBUG
#include <x0vncserver/TimeMillis.h>
#endif
using namespace rfb;
class PollingManager {
public:
PollingManager(Display *dpy, XPixelBuffer *buffer, ImageFactory *factory,
int offsetLeft = 0, int offsetTop = 0);
virtual ~PollingManager();
// Currently, these functions do nothing. In past versions, we used
// to poll area around the pointer if its position has been changed
// recently. But that rather decreased overal polling performance,
// so we don't do that any more. However, pointer position may be a
// useful hint and might be used in future code, so we do not remove
// these functions, just in case.
void setPointerPos(const Point &pos) {}
void unsetPointerPos() {}
void poll(VNCServer *server);
protected:
// Screen polling. Returns true if some changes were detected.
bool pollScreen(VNCServer *server);
Display *m_dpy;
const Image *m_image;
const int m_bytesPerPixel;
const int m_offsetLeft;
const int m_offsetTop;
const int m_width;
const int m_height;
private:
inline void getRow(int x, int y, int w) {
if (w == m_width) {
// Getting full row may be more efficient.
m_rowImage->get(DefaultRootWindow(m_dpy),
m_offsetLeft, m_offsetTop + y);
} else {
m_rowImage->get(DefaultRootWindow(m_dpy),
m_offsetLeft + x, m_offsetTop + y, w, 1);
}
}
inline void getColumn(int x, int y, int h) {
m_columnImage->get(DefaultRootWindow(m_dpy),
m_offsetLeft + x, m_offsetTop + y, 1, h);
}
inline int getTileIndex(int x, int y) {
int tile_x = x / 32;
int tile_y = y / 32;
return tile_y * m_widthTiles + tile_x;
}
int checkRow(int x, int y, int w);
int checkColumn(int x, int y, int h, bool *pChangeFlags);
int sendChanges(VNCServer *server);
// Check neighboring tiles and update m_changeFlags[].
void checkNeighbors();
// DEBUG: Print the list of changed tiles.
void printChanges(const char *header) const;
// Additional images used in polling algorithms.
Image *m_rowImage; // one row of the framebuffer
Image *m_columnImage; // one column of the framebuffer
const int m_widthTiles; // shortcut for ((m_width + 31) / 32)
const int m_heightTiles; // shortcut for ((m_height + 31) / 32)
const int m_numTiles; // shortcut for (m_widthTiles * m_heightTiles)
// m_changeFlags[] array will hold boolean values corresponding to
// each 32x32 tile. If a value is true, then we've detected a change
// in that tile.
bool *m_changeFlags;
unsigned int m_pollingStep;
static const int m_pollingOrder[];
#ifdef DEBUG
private:
void debugBeforePoll();
void debugAfterPoll();
TimeMillis m_timeSaved;
#endif
};
#endif // __POLLINGMANAGER_H__
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