Lomiri
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OpacityMask.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
17import QtQuick 2.12
18
19Item {
20 id: root
21 anchors.fill: sourceItem
22 anchors.margins: -units.gu(2)
23 visible: sourceItem !== null
24
25 property var sourceItem: null
26 property int maskX: 0
27 property int maskY: 0
28 property int maskWidth: 0
29 property int maskHeight: 0
30
31 property real opacityValue: 1
32
33 Item {
34 id: opacityMask
35 anchors.fill: parent
36
37 Rectangle {
38 id: clipRect
39 color: "black"
40 x: root.maskX - root.anchors.margins
41 y: root.maskY - root.anchors.margins
42 width: root.maskWidth
43 height: root.maskHeight
44 opacity: 1 - root.opacityValue
45 }
46 }
47
48 ShaderEffect {
49 id: opacityEffect
50 anchors.fill: parent
51
52 property variant source: ShaderEffectSource {
53 id: shaderEffectSource
54 sourceItem: root.sourceItem
55 sourceRect: root.sourceItem ? Qt.rect(sourceItem.x + root.anchors.margins,
56 sourceItem.y + root.anchors.margins,
57 sourceItem.width - root.anchors.margins * 2,
58 sourceItem.height - root.anchors.margins * 2)
59 : Qt.rect(0,0,0,0)
60 hideSource: true
61 }
62
63 property var mask: ShaderEffectSource {
64 sourceItem: opacityMask
65 hideSource: true
66 }
67
68 fragmentShader: "
69 varying highp vec2 qt_TexCoord0;
70 uniform sampler2D source;
71 uniform sampler2D mask;
72 void main(void)
73 {
74 highp vec4 sourceColor = texture2D(source, qt_TexCoord0);
75 highp vec4 maskColor = texture2D(mask, qt_TexCoord0);
76
77 sourceColor *= 1.0 - maskColor.a;
78
79 gl_FragColor = sourceColor;
80 }"
81 }
82}