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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.0
import "private"
Item {
id: rootItem
property bool cached: false
property real angle: 0.0
property real horizontalOffset: 0.0
property real verticalOffset: 0.0
property variant source
property Gradient gradient: Gradient {
GradientStop { position: 0.0; color: "white" }
GradientStop { position: 1.0; color: "black" }
}
SourceProxy {
id: maskSourceProxy
input: rootItem.source
}
Rectangle {
id: gradientRect
width: 16
height: 256
gradient: rootItem.gradient
smooth: true
}
ShaderEffectSource {
id: cacheItem
anchors.fill: parent
visible: rootItem.cached
smooth: true
rotation: shaderItem.rotation
sourceItem: shaderItem
live: true
hideSource: visible
}
ShaderEffect {
id: shaderItem
property variant gradientSource: ShaderEffectSource {
sourceItem: gradientRect
smooth: true
hideSource: true
visible: false
}
property variant maskSource: maskSourceProxy.output
property real startAngle: (rootItem.angle - 90) * Math.PI/180
property variant center: Qt.point(0.5 + horizontalOffset / width, 0.5 + verticalOffset / height)
anchors.fill: parent
fragmentShader: maskSource == undefined ? noMaskShader : maskShader
onFragmentShaderChanged: startAngleChanged()
property string noMaskShader: "
varying mediump vec2 qt_TexCoord0;
uniform lowp sampler2D gradientSource;
uniform highp float qt_Opacity;
uniform highp float startAngle;
uniform highp vec2 center;
void main() {
const highp float PI = 3.14159265;
const highp float PIx2inv = 0.1591549;
highp float a = (atan((center.y - qt_TexCoord0.t), (center.x - qt_TexCoord0.s)) + PI - startAngle) * PIx2inv;
gl_FragColor = texture2D(gradientSource, vec2(0.0, fract(a))) * qt_Opacity;
}
"
property string maskShader: "
varying mediump vec2 qt_TexCoord0;
uniform lowp sampler2D gradientSource;
uniform lowp sampler2D maskSource;
uniform highp float qt_Opacity;
uniform highp float startAngle;
uniform highp vec2 center;
void main() {
lowp float maskAlpha = texture2D(maskSource, qt_TexCoord0).a;
const highp float PI = 3.14159265;
const highp float PIx2inv = 0.1591549;
highp float a = (atan((center.y - qt_TexCoord0.t), (center.x - qt_TexCoord0.s)) + PI - startAngle) * PIx2inv;
gl_FragColor = texture2D(gradientSource, vec2(0.0, fract(a))) * maskAlpha * qt_Opacity;
}
"
}
}
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