Qt 5.8 | Qt Multimedia | Media Player Example | histogramwidget.h Example File

Qt 5.8.0 Reference Documentation

# histogramwidget.h Example File

multimediawidgets/player/histogramwidget.h

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #ifndef HISTOGRAMWIDGET_H
      #define HISTOGRAMWIDGET_H

      #include <QThread>
      #include <QVideoFrame>
      #include <QWidget>

      class FrameProcessor: public QObject
      {
          Q_OBJECT

      public slots:
          void processFrame(QVideoFrame frame, int levels);

      signals:
          void histogramReady(QVector<qreal> histogram);
      };

      class HistogramWidget : public QWidget
      {
          Q_OBJECT

      public:
          explicit HistogramWidget(QWidget *parent = 0);
          ~HistogramWidget();
          void setLevels(int levels) { m_levels = levels; }

      public slots:
          void processFrame(QVideoFrame frame);
          void setHistogram(QVector<qreal> histogram);

      protected:
          void paintEvent(QPaintEvent *event);

      private:
          QVector<qreal> m_histogram;
          int m_levels;
          FrameProcessor m_processor;
          QThread m_processorThread;
          bool m_isBusy;
      };

      #endif // HISTOGRAMWIDGET_H