1 | /* |
2 | * Copyright © 2008 Fredrik Höglund <fredrik@kde.org> |
3 | * |
4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
5 | * of this software and associated documentation files (the "Software"), to deal |
6 | * in the Software without restriction, including without limitation the rights |
7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
8 | * copies of the Software, and to permit persons to whom the Software is |
9 | * furnished to do so, subject to the following conditions: |
10 | * |
11 | * The above copyright notice and this permission notice shall be included in |
12 | * all copies or substantial portions of the Software. |
13 | * |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
17 | * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
18 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
19 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
20 | */ |
21 | |
22 | #ifndef FADEEFFECT_H |
23 | #define FADEEFFECT_H |
24 | |
25 | #include <QObject> |
26 | #include <QTime> |
27 | |
28 | #include "logouteffect.h" |
29 | #include <X11/Xlib.h> |
30 | |
31 | |
32 | class QWidget; |
33 | class QPixmap; |
34 | class BlendingThread; |
35 | |
36 | |
37 | /** |
38 | * This class implements an effect that will slowly fade the screen from color to grayscale. |
39 | * |
40 | * This class is X11 specific, and currently only works on little-endian systems where |
41 | * the root window has a 24/32 or 16 bit r5g6b5 pixel format. |
42 | */ |
43 | class FadeEffect : public LogoutEffect |
44 | { |
45 | Q_OBJECT |
46 | |
47 | public: |
48 | /** |
49 | * Creates the FadeEffect. |
50 | * |
51 | * This effect will grab a screenshot and then slowly fade it to gray, |
52 | * rendering each frame on the pixmap you pass to the constructor. |
53 | * The animation will begin when you call start(), and each time the |
54 | * pixmap is updated, update() will be called in the @p parent widget, |
55 | * which must then paint the pixmap. |
56 | * |
57 | * The actual blending is done in a separate thread to keep the event |
58 | * loop alive. |
59 | * |
60 | * The FadeEffect can safely be deleted at any time, even while the |
61 | * effect is running, but it's important that the pixmap isn't deleted |
62 | * before the effect object. |
63 | * |
64 | * @param parent The parent widget, which will draw the pixmap. |
65 | * @param pixmap The pixmap the effect will be rendered to. |
66 | */ |
67 | FadeEffect(QWidget *parent, QPixmap *pixmap); |
68 | |
69 | /** |
70 | * Destroys the fade effect. |
71 | */ |
72 | ~FadeEffect(); |
73 | |
74 | /** |
75 | * Starts the animation. |
76 | */ |
77 | void start(); |
78 | |
79 | private slots: |
80 | /** @internal */ |
81 | void grabImageSection(); |
82 | |
83 | /** @internal */ |
84 | void nextFrame(); |
85 | |
86 | private: |
87 | BlendingThread *blender; |
88 | int alpha; |
89 | int currentY; |
90 | bool done; |
91 | XImage *image; |
92 | GC gc; |
93 | QTime time; |
94 | }; |
95 | |
96 | #endif |
97 | |
98 | |