CuteLogger
Fast and simple logging solution for Qt based applications
videozoomwidget.h
1 /*
2  * Copyright (c) 2019 Meltytech, LLC
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #ifndef VIDEOZOOMWIDGET_H
19 #define VIDEOZOOMWIDGET_H
20 
21 #include "sharedframe.h"
22 
23 #include <QMutex>
24 #include <QWidget>
25 
26 class VideoZoomWidget : public QWidget
27 {
28  Q_OBJECT
29 
30 public:
31  struct PixelValues
32  {
33  uint8_t y;
34  uint8_t u;
35  uint8_t v;
36  uint8_t r;
37  uint8_t g;
38  uint8_t b;
39  };
40 
41  explicit VideoZoomWidget();
42 
43  // May be called from a worker thread.
44  void putFrame(SharedFrame frame);
45 
46  QPoint getSelectedPixel();
47  void setSelectedPixel(QPoint pixel);
48  QRect getPixelRect();
49  int getZoom();
50  PixelValues getPixelValues(const QPoint &pixel);
51  void setOffset(QPoint offset);
52 
53 signals:
54  void pixelSelected(const QPoint &);
55  void zoomChanged(int zoom);
56 
57 public slots:
58  void lock(bool locked);
59 
60 private:
61  virtual QSize sizeHint() const Q_DECL_OVERRIDE;
62 
63  void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
64  void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
65  void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
66  void wheelEvent(QWheelEvent *event) Q_DECL_OVERRIDE;
67 
68  QPoint pixelToPos(const QPoint &pixel);
69  QPoint posToPixel(const QPoint &pos);
70  PixelValues pixelToValues(const QPoint &pixel);
71 
72  bool m_locked;
73  bool m_selectionInProgress;
74  int m_zoom;
75  QPoint m_imageOffset;
76  QPoint m_mouseGrabPixel;
77  QPoint m_selectedPixel;
78 
79  // Variables accessed from multiple threads (mutex protected)
80  QMutex m_mutex;
81  SharedFrame m_frame;
82 };
83 
84 #endif // VIDEOZOOMWIDGET_H
The SharedFrame provides thread safe access to Mlt::Frame data.
Definition: sharedframe.h:50