picture.cpp

一个linux下的摄像头编程

/****************************************************************************
** $Id: qt/examples/picture/picture.cpp   2.3.1   edited 2001-02-20 $
**
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
**
** This file is part of an example program for Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#define HANDLE _AvoidTypedefConflictWidthQT

#include "cam.h"

// include opencv

#include <cv.h>
#include <cvvis.h>
#include <ipl.h>

#undef HANDLE

#include <qapplication.h>
#include <qpainter.h>
#include <qpicture.h>
#include <qpixmap.h>
#include <qwidget.h>
#include <qmessagebox.h>
#include <qfile.h>
#include <ctype.h>
#include <qimage.h>
#include <qsplitter.h>
#include <qthread.h>
#include <iostream>


QMutex m;



class PictureDisplay : public QWidget		// picture display widget
{
public:
    PictureDisplay(QWidget* parent, const char* name=0, int f=0);
   ~PictureDisplay();
protected:
    void	paintEvent( QPaintEvent * );
public :
    QPixmap pixmap;
private:
};




PictureDisplay::PictureDisplay(QWidget* parent, const char* name, int f):QWidget(parent, name, f)
{
	;
}

PictureDisplay::~PictureDisplay()
{
;
}

void PictureDisplay::paintEvent( QPaintEvent * )
{
	QPainter paint( this );			// paint widget
	m.lock();
	paint.drawPixmap( 0, 0, pixmap );
	m.unlock();
}

           void foo(IplImage *ipl_img ,QImage *q)
{
	int x;
	int y;
	char *data = ipl_img->imageData;
	for( y = 0; y < ipl_img->height; y++, data += ipl_img->widthStep )
                for( x = 0; x < ipl_img->width; x++ )
	            {
		    			uint *p = (uint*)q->scanLine(y) + x;
		        		*p = qRgb(data[x * ipl_img->nChannels+2],data[x * ipl_img->nChannels +1],data[x * ipl_img->nChannels]);
	             }
}


class Capturer : public QThread
 {
	public:
	Capturer(int camnr);
	~Capturer();
    virtual void run();
    PictureDisplay *p;
	IplImage *i;
	CCamera	c;
	QImage	*q;
};

Capturer :: Capturer(int camnr)
{
	c.connect(camnr);
   CvSize sz = cvSize(320,240);
	c.setSize(sz);
	i = cvCreateImage(sz,8,3);
	q = new QImage();
	q->create(320,240,32);
}

Capturer :: ~Capturer()
{
	c.disconnect();
	delete(q);
}

void Capturer ::run()
{
    while(true)
    {
		c.capture(i);
		foo(i,q);
		m.lock();
		p->pixmap.convertFromImage(*q);
		m.unlock();
		p->repaint();
    }
}



int main( int argc, char **argv )
{
    QApplication a( argc, argv );		// QApplication required!
	cvvInitSystem(0,0);
	QSplitter *s1 = new QSplitter( QSplitter::Vertical, 0 , "main" );

	PictureDisplay *test = new PictureDisplay(s1);		// create picture display

	a.setMainWidget(s1);			// set main widget
	s1->show();				// show it
	
	Capturer t1(0);
	t1.p = test;
	t1.start();

	return a.exec();				// start event loop

}