1 /****************************************************************************
2 **
3 ** Copyright (C) 2016 The Qt Company Ltd.
4 ** Contact: https://www.qt.io/licensing/
5 **
6 ** This file is part of the examples of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:BSD$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and The Qt Company. For licensing terms
14 ** and conditions see https://www.qt.io/terms-conditions. For further
15 ** information use the contact form at https://www.qt.io/contact-us.
16 **
17 ** BSD License Usage
18 ** Alternatively, you may use this file under the terms of the BSD license
19 ** as follows:
20 **
21 ** "Redistribution and use in source and binary forms, with or without
22 ** modification, are permitted provided that the following conditions are
23 ** met:
24 **   * Redistributions of source code must retain the above copyright
25 **     notice, this list of conditions and the following disclaimer.
26 **   * Redistributions in binary form must reproduce the above copyright
27 **     notice, this list of conditions and the following disclaimer in
28 **     the documentation and/or other materials provided with the
29 **     distribution.
30 **   * Neither the name of The Qt Company Ltd nor the names of its
31 **     contributors may be used to endorse or promote products derived
32 **     from this software without specific prior written permission.
33 **
34 **
35 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46 **
47 ** $QT_END_LICENSE$
48 **
49 ****************************************************************************/
50 
51 #ifndef RENDERTHREAD_H
52 #define RENDERTHREAD_H
53 
54 #include <QMutex>
55 #include <QSize>
56 #include <QThread>
57 #include <QWaitCondition>
58 
59 QT_BEGIN_NAMESPACE
60 class QImage;
61 QT_END_NAMESPACE
62 
63 //! [0]
64 class RenderThread : public QThread
65 {
66     Q_OBJECT
67 
68 public:
69     RenderThread(QObject *parent = nullptr);
70     ~RenderThread();
71 
72     void render(double centerX, double centerY, double scaleFactor, QSize resultSize,
73                 double devicePixelRatio);
74 
75 signals:
76     void renderedImage(const QImage &image, double scaleFactor);
77 
78 protected:
79     void run() override;
80 
81 private:
82     static uint rgbFromWaveLength(double wave);
83 
84     QMutex mutex;
85     QWaitCondition condition;
86     double centerX;
87     double centerY;
88     double scaleFactor;
89     double devicePixelRatio;
90     QSize resultSize;
91     bool restart = false;
92     bool abort = false;
93 
94     enum { ColormapSize = 512 };
95     uint colormap[ColormapSize];
96 };
97 //! [0]
98 
99 #endif // RENDERTHREAD_H
100