Unity 8
BackgroundBlur.qml
1 /*
2  * Copyright (C) 2016 Canonical, Ltd.
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; version 3.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  */
16 
17 import QtQuick 2.12
18 import Ubuntu.Components 1.3
19 import QtGraphicalEffects 1.0
20 
21 Item {
22  id: root
23 
24  property int blurAmount: 32
25  property Item sourceItem
26  property rect blurRect: Qt.rect(0,0,0,0)
27  property alias cached: fastBlur.cached
28  property bool occluding: false
29 
30  ShaderEffect {
31  id: maskedBlurEffect
32  x: blurRect.x
33  y: blurRect.y
34  width: blurRect.width
35  height: blurRect.height
36 
37  property variant source: ShaderEffectSource {
38  id: shaderEffectSource
39  sourceItem: root.sourceItem
40  hideSource: root.occluding
41  sourceRect: root.blurRect
42  live: false
43  }
44  }
45 
46  FastBlur {
47  id: fastBlur
48  x: blurRect.x
49  y: blurRect.y
50  width: blurRect.width
51  height: blurRect.height
52  source: maskedBlurEffect
53  radius: Math.min(blurAmount, 128)
54  }
55 
56  Timer {
57  interval: 48
58  repeat: !cached
59  running: repeat
60  onTriggered: shaderEffectSource.scheduleUpdate()
61  }
62  }