thumbnailworker.cpp

   1 #include "thumbnailworker.h"
   2
   3 #include <QDebug>
   4 #include <QTimer>
   5 #include <QThread>
   6
   7 ThumbnailWorker::ThumbnailWorker(QObject *parent) :
   8     QObject(parent),
   9     m_mutex(),
  10     m_pathList(),
  11     m_loop(true)
  12 {
  13 }
  14
  15 void ThumbnailWorker::addPath(const QString &path)
  16 {
  17     QMutexLocker locker(&m_mutex);
  18     m_pathList << path;
  19 }
  20
  21 void ThumbnailWorker::clearPath()
  22 {
  23     QMutexLocker locker(&m_mutex);
  24     m_pathList.clear();
  25 }
  26
  27 void ThumbnailWorker::finish()
  28 {
  29     QMutexLocker locker(&m_mutex);
  30     m_loop = false;
  31     qDebug() << "ThumbnailWorker::finish()";
  32 }
  33
  34 QString ThumbnailWorker::getPath()
  35 {
  36     QMutexLocker locker(&m_mutex);
  37     if (m_pathList.isEmpty()) {
  38         return QString();
  39     }
  40     return m_pathList.takeFirst();
  41 }
  42
  43 bool ThumbnailWorker::loop()
  44 {
  45     QMutexLocker locker(&m_mutex);
  46     return m_loop;
  47 }
  48
  49 void ThumbnailWorker::doWork()
  50 {
  51     while (loop()) {
  52         QString path = getPath();
  53         if (!path.isEmpty()) {
  54             QPixmap pixmap(path);
  55             if (!pixmap.isNull()) {
  56                 QSize size(256, 256);
  57                 double scaleX = 1.0 * size.width() / pixmap.width();
  58                 double scaleY = 1.0 * size.height() / pixmap.height();
  59                 double scaleFactor = qMin(scaleX, scaleY);
  60                 if (scaleFactor < 1) {
  61                     pixmap = pixmap.scaled(pixmap.size() * scaleFactor,
  62                                            Qt::IgnoreAspectRatio,
  63                                            Qt::SmoothTransformation);
  64                 }
  65                 emit resultReady(path, pixmap);
  66             }
  67         }
  68         QThread::msleep(100);
  69     }
  70
  71     emit finished();
  72     qDebug() << "ThumbnailWorker::doWork() finished.";
  73 }