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//------------------------------------------------------------------------
// Copyright 2008-2009 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// This file is part of the ZBar Bar Code Reader.
//
// The ZBar Bar Code Reader is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// The ZBar Bar Code Reader 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 Lesser Public License for more details.
//
// You should have received a copy of the GNU Lesser Public License
// along with the ZBar Bar Code Reader; if not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301 USA
//
// http://sourceforge.net/projects/zbar
//------------------------------------------------------------------------
#ifndef _QZBARTHREAD_H_
#define _QZBARTHREAD_H_
#include <QEvent>
#include <QMutex>
#include <QThread>
#include <QWaitCondition>
#include <zbar.h>
#include <zbar/QZBar.h>
#include <zbar/QZBarImage.h>
#define DEFAULT_WIDTH 640
#define DEFAULT_HEIGHT 480
namespace zbar
{
class QZBarThread : public QThread, public Image::Handler
{
Q_OBJECT
public:
enum EventType
{
VideoDevice = QEvent::User,
VideoEnabled,
ScanImage,
ReOpen,
Exit = QEvent::MaxUser
};
class VideoDeviceEvent : public QEvent
{
public:
VideoDeviceEvent(const QString &device)
: QEvent((QEvent::Type)VideoDevice), device(device)
{
}
const QString device;
};
class VideoEnabledEvent : public QEvent
{
public:
VideoEnabledEvent(bool enabled)
: QEvent((QEvent::Type)VideoEnabled), enabled(enabled)
{
}
bool enabled;
};
class ScanImageEvent : public QEvent
{
public:
ScanImageEvent(const QImage &image)
: QEvent((QEvent::Type)ScanImage), image(image)
{
}
const QImage image;
};
QMutex mutex;
QWaitCondition newEvent;
// message queue for events passed from main gui thread to processor.
// (NB could(/should?) be QAbstractEventDispatcher except it doesn't
// work as documented!? ):
// protected by mutex
QList<QEvent *> queue;
// shared state:
// written by processor thread just after opening video or
// scanning an image, read by main gui thread during size_request.
// protected by mutex
bool _videoOpened;
unsigned reqWidth, reqHeight;
// window is also shared: owned by main gui thread.
// processor thread only calls draw(), clear() and negotiate_format().
// protected by its own internal lock
Window window;
QZBarThread(int verbosity = 0);
int get_controls(int index, char **name = NULL, char **group = NULL,
enum QZBar::ControlType *type = NULL, int *min = NULL,
int *max = NULL, int *def = NULL, int *step = NULL);
QVector<QPair<int, QString> > get_menu(int index);
int set_control(char *name, bool value);
int set_control(char *name, int value);
int get_control(char *name, bool *value);
int get_control(char *name, int *value);
int set_config(std::string cfgstr)
{
return scanner.set_config(cfgstr);
}
int set_config(zbar_symbol_type_t symbology, zbar_config_t config,
int value)
{
return scanner.set_config(symbology, config, value);
}
int get_config(zbar_symbol_type_t symbology, zbar_config_t config,
int &value)
{
return scanner.get_config(symbology, config, value);
}
void request_size(unsigned width, unsigned height);
int get_resolution(int index, unsigned &width, unsigned &height,
float &max_fps);
int request_dbus(bool enabled)
{
return scanner.request_dbus(enabled);
}
void pushEvent(QEvent *e)
{
QMutexLocker locker(&mutex);
queue.append(e);
newEvent.wakeOne();
}
Q_SIGNALS:
void videoOpened(bool opened);
void update();
void decoded(int type, const QString &data);
void decodedText(const QString &data);
protected:
void run();
void openVideo(const QString &device);
void enableVideo(bool enable);
void processImage(Image &image);
void clear()
{
window.clear();
if (image) {
delete image;
image = NULL;
}
}
virtual void image_callback(Image &image);
virtual bool event(QEvent *e);
virtual void videoDeviceEvent(VideoDeviceEvent *event);
virtual void videoEnabledEvent(VideoEnabledEvent *event);
virtual void scanImageEvent(ScanImageEvent *event);
private:
Video *video;
ImageScanner scanner;
QZBarImage *image;
QString currentDevice;
bool running;
bool videoRunning;
bool videoEnabled;
};
}; // namespace zbar
#endif
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