centrino:/home/jrs# cat /media/linuxserver/homes/cvs/qtopia-opensource-4.2.0/devices/htcuniversal/src/plugins/qtopiacore/mousedrivers/htcuniversal/htcuniversalmousehandler.cpp
/****************************************************************************
**
** Copyright (C) 2000-2006 TROLLTECH ASA. All rights reserved.
**
** This file is part of the Phone Edition of the Qtopia Toolkit.
**
** This software is licensed under the terms of the GNU General Public
** License (GPL) version 2.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "htcuniversalmousehandler.h"

#ifdef QT_QWS_HTCUNIVERSAL
#include <QFile>
#include <QTextStream>
#include <QScreen>
#include <QSocketNotifier>
#include <QDebug>

#include <qtopialog.h>

#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#define QT_QWS_TP_PRESSURE_THRESHOLD 1

typedef struct {
    unsigned short pressure;
    unsigned short x;
    unsigned short y;
    unsigned short pad;
} ts_packet;


HtcuniversalMouseHandler::HtcuniversalMouseHandler()
    : m_raw(false), totX(0), totY(0), nX(0), nY(0), mouseIdx(0)
{
    qLog(Input) << "Loaded Htcuniversal touchscreen plugin";
    setObjectName( "Htcuniversal Mouse Handler" );
    openTs();
}

HtcuniversalMouseHandler::~HtcuniversalMouseHandler()
{
    closeTs();
}

void HtcuniversalMouseHandler::openTs()
{
    if ((mouseFD = open("/dev/input/event0", O_RDONLY | O_NDELAY)) < 0) {
      qWarning("Cannot open /dev/input/event0 (%s)", strerror(errno));
      return;
    } else
      qLog(Input) << "Opened /dev/input/event0 as touchscreen input";

    m_notify = new QSocketNotifier( mouseFD, QSocketNotifier::Read, this );
    connect( m_notify, SIGNAL(activated(int)), this, SLOT(readMouseData()));
}

void HtcuniversalMouseHandler::closeTs()
{
    if (mouseFD)
        close(mouseFD);
    mouseFD = 0;

    delete m_notify;
    m_notify = 0;
    m_raw = false;
}

void HtcuniversalMouseHandler::suspend()
{
    m_notify->setEnabled( false );
}

void HtcuniversalMouseHandler::resume()
{
    m_notify->setEnabled( true );
}

void HtcuniversalMouseHandler::readMouseData()
{
    if(!qt_screen)
        return;

    int i, j, dx, dy;
    int n=0;

    do {
      n = read(mouseFD, mouseBuf+mouseIdx, mouseBufSize-mouseIdx);

      if(n > 0)
        mouseIdx += n;

      ts_packet *data;
      int idx = 0;

      while (mouseIdx-idx >= (int)sizeof(ts_packet)) {
        uchar *mb = mouseBuf+idx;
        data = (ts_packet *) mb;

        if(data->pressure >= QT_QWS_TP_PRESSURE_THRESHOLD ) {
          totX = totX + data->x;
          sx[nX] = data->x;
          nX++;
          totY = totY + data->y;
          sy[nY] = data->y;
          nY++;
          if(nX >= TS_SAMPLES && nY >= TS_SAMPLES) {
            if(nX < nY) ss=nX;
            else ss=nY;

            index_x1 = index_x2 = index_y1 = index_y2 = 0;

            for(i=0;i<ss-1;i++) {
              for(j=i+1;j<ss;j++) {
                 dx = sx[i] - sx[j];
                 if(dx < 0) dx = -dx;
                 dy = sy[i] - sy[j];
                 if(dy < 0) dy = -dy;
                 if(min_x > dx) {
                   min_x = dx;
                   index_x1 = i;
                   index_x2 = j;
                 }
                 if(min_y > dy) {
                   min_y = dy;
                   index_y1 = i;
                   index_y2 = j;
                 }
               }
             }
            QPoint pos( (sx[index_x1] + sx[index_x2])/2,
                    (sy[index_y1] + sy[index_y2])/2);

            nX=0; nY=0; totX=0; totY=0;
            oldmouse = transform( pos );
            if(oldmouse.x() < 0 || oldmouse.x() > 9000 ||
               oldmouse.y() < 0 || oldmouse.y() > 9000) {
              qLog(Input) << "*BAD Mouse sample :x=" << oldmouse.x() << ",y=" << oldmouse.y();
              oldmouse.setX(0);
              oldmouse.setY(0);
            } else {
              qLog(Input) << "Mouse Down:x=" << oldmouse.x() << ",y=" << oldmouse.y();
              emit mouseChanged( oldmouse, Qt::LeftButton);
            }
          }
        } else {
          // Removed pen from screen
          qLog(Input) << "Mouse Up : x=" << oldmouse.x() << ", y=" << oldmouse.y();
          emit mouseChanged( oldmouse, 0);
          nX=0; nY=0; totX=0; totY=0;
        }
        idx += sizeof(ts_packet);
      }
      int surplus = mouseIdx - idx;
      for (int i = 0; i < surplus; i++)
        mouseBuf[i] = mouseBuf[idx+i];
      mouseIdx = surplus;
    } while (n > 0);
}

#endif // QT_QWS_HTCUNIVERSAL