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Viewing changes to qml/Stage/Spread/OpacityMask.qml

  • Committer: Michael Zanetti
  • Date: 2016-11-30 13:28:07 UTC
  • mfrom: (2704 unity8)
  • mto: This revision was merged to the branch mainline in revision 2739.
  • Revision ID: michael.zanetti@canonical.com-20161130132807-c314dqdxenzwy69c
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qml/Stage/Spread/OpacityMask.qml
 
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/*
 
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 * Copyright (C) 2016 Canonical, Ltd.
 
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 *
 
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 * This program is free software; you can redistribute it and/or modify
 
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 * it under the terms of the GNU General Public License as published by
 
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 * the Free Software Foundation; version 3.
 
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 *
 
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 * This program is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 * GNU General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License
 
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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 */
 
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import QtQuick 2.4
 
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Item {
 
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    id: root
 
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    anchors.fill: sourceItem
 
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    anchors.margins: -units.gu(2)
 
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    visible: sourceItem !== null
 
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    property var sourceItem: null
 
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    property int maskX: 0
 
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    property int maskY: 0
 
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    property int maskWidth: 0
 
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    property int maskHeight: 0
 
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    property real opacityValue: 1
 
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    Item {
 
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        id: opacityMask
 
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        anchors.fill: parent
 
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        Rectangle {
 
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            id: clipRect
 
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            color: "black"
 
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            x: root.maskX - root.anchors.margins
 
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            y: root.maskY - root.anchors.margins
 
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            width: root.maskWidth
 
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            height: root.maskHeight
 
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            opacity: 1 - root.opacityValue
 
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        }
 
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    }
 
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    ShaderEffect {
 
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        id: opacityEffect
 
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        anchors.fill: parent
 
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        property variant source: ShaderEffectSource {
 
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            id: shaderEffectSource
 
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            sourceItem: root.sourceItem
 
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            sourceRect: root.sourceItem ? Qt.rect(sourceItem.x + root.anchors.margins,
 
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                                                sourceItem.y + root.anchors.margins,
 
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                                                sourceItem.width - root.anchors.margins * 2,
 
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                                                sourceItem.height - root.anchors.margins * 2)
 
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                                        : Qt.rect(0,0,0,0)
 
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            hideSource: true
 
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        }
 
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        property var mask: ShaderEffectSource {
 
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            sourceItem: opacityMask
 
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            hideSource: true
 
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        }
 
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        fragmentShader: "
 
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            varying highp vec2 qt_TexCoord0;
 
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            uniform sampler2D source;
 
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            uniform sampler2D mask;
 
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            void main(void)
 
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            {
 
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                highp vec4 sourceColor = texture2D(source, qt_TexCoord0);
 
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                highp vec4 maskColor = texture2D(mask, qt_TexCoord0);
 
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                sourceColor *= 1.0 - maskColor.a;
 
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                gl_FragColor = sourceColor;
 
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            }"
 
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    }
 
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}