1 /* ============================================================
2  *
3  * This file is a part of digiKam project
4  * https://www.digikam.org
5  *
6  * Date        : 2017-05-24
7  * Description : video frame effects manager.
8  *
9  * Copyright (C) 2017-2021 by Gilles Caulier <caulier dot gilles at gmail dot com>
10  *
11  * This program is free software; you can redistribute it
12  * and/or modify it under the terms of the GNU General
13  * Public License as published by the Free Software Foundation;
14  * either version 2, or (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU General Public License for more details.
20  *
21  * ============================================================ */
22 
23 #include "effectmngr_p.h"
24 
25 namespace Digikam
26 {
27 
effectKenBurnsZoomIn(bool aInit)28 int EffectMngr::Private::effectKenBurnsZoomIn(bool aInit)
29 {
30     if (aInit)
31     {
32         eff_step = 0;
33     }
34 
35     QRectF fRect(eff_image.rect());
36 
37     // This effect zoom in on the center of image from 100 to 80 percents.
38     double nx    = eff_step * ((eff_image.width() - eff_image.width() * 0.8) / eff_imgFrames);
39     double ny    = nx / ((double)eff_image.width() / (double)eff_image.height());
40     fRect.setTopLeft(QPointF(nx, ny));
41     fRect.setBottomRight(QPointF((double)eff_image.width()-nx, (double)eff_image.height()-ny));
42 
43     updateCurrentFrame(fRect);
44 
45     eff_step++;
46 
47     if (eff_step != eff_imgFrames)
48     {
49         return 15;
50     }
51 
52     return -1;
53 }
54 
effectKenBurnsZoomOut(bool aInit)55 int EffectMngr::Private::effectKenBurnsZoomOut(bool aInit)
56 {
57     if (aInit)
58     {
59         eff_step = eff_imgFrames;
60     }
61 
62     QRectF fRect(eff_image.rect());
63 
64     // This effect zoom out on the center of image from 80 to 100 percents.
65     double nx    = eff_step * ((eff_image.width() - eff_image.width() * 0.8) / eff_imgFrames);
66     double ny    = nx / ((double)eff_image.width() / (double)eff_image.height());
67     fRect.setTopLeft(QPointF(nx, ny));
68     fRect.setBottomRight(QPointF((double)eff_image.width()-nx, (double)eff_image.height()-ny));
69 
70     updateCurrentFrame(fRect);
71 
72     eff_step--;
73 
74     if (eff_step != 0)
75     {
76         return 15;
77     }
78 
79     return -1;
80 }
81 
82 } // namespace Digikam
83