/usr/lib/x86_64-linux-gnu/qt5/qml/QtGraphicalEffects/private/FastGlow.qml is in qml-module-qtgraphicaleffects 5.5.1-1ubuntu1.
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The actual contents of the file can be viewed below.
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**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** 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 The Qt Company Ltd 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
Item {
id: rootItem
property variant source
property real spread: 0.0
property real blur: 0.0
property color color: "white"
property bool transparentBorder: false
property bool cached: false
SourceProxy {
id: sourceProxy
input: rootItem.source
}
ShaderEffectSource {
id: cacheItem
anchors.fill: shaderItem
visible: rootItem.cached
smooth: true
sourceItem: shaderItem
live: true
hideSource: visible
}
property string __internalBlurVertexShader: "
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
uniform highp mat4 qt_Matrix;
uniform highp float yStep;
uniform highp float xStep;
varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
varying highp vec2 qt_TexCoord2;
varying highp vec2 qt_TexCoord3;
void main() {
qt_TexCoord0 = vec2(qt_MultiTexCoord0.x + xStep, qt_MultiTexCoord0.y + yStep * 0.36);
qt_TexCoord1 = vec2(qt_MultiTexCoord0.x + xStep * 0.36, qt_MultiTexCoord0.y - yStep);
qt_TexCoord2 = vec2(qt_MultiTexCoord0.x - xStep * 0.36, qt_MultiTexCoord0.y + yStep);
qt_TexCoord3 = vec2(qt_MultiTexCoord0.x - xStep, qt_MultiTexCoord0.y - yStep * 0.36);
gl_Position = qt_Matrix * qt_Vertex;
}
"
property string __internalBlurFragmentShader: "
uniform lowp sampler2D source;
uniform lowp float qt_Opacity;
varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
varying highp vec2 qt_TexCoord2;
varying highp vec2 qt_TexCoord3;
void main() {
highp vec4 sourceColor = (texture2D(source, qt_TexCoord0) +
texture2D(source, qt_TexCoord1) +
texture2D(source, qt_TexCoord2) +
texture2D(source, qt_TexCoord3)) * 0.25;
gl_FragColor = sourceColor * qt_Opacity;
}
"
ShaderEffect {
id: level0
property variant source: sourceProxy.output
anchors.fill: parent
visible: false
smooth: true
}
ShaderEffectSource {
id: level1
width: Math.ceil(shaderItem.width / 32) * 32
height: Math.ceil(shaderItem.height / 32) * 32
sourceItem: level0
hideSource: rootItem.visible
sourceRect: transparentBorder ? Qt.rect(-64, -64, shaderItem.width, shaderItem.height) : Qt.rect(0,0,0,0)
smooth: true
visible: false
}
ShaderEffect {
id: effect1
property variant source: level1
property real yStep: 1/height
property real xStep: 1/width
anchors.fill: level2
visible: false
smooth: true
vertexShader: __internalBlurVertexShader
fragmentShader: __internalBlurFragmentShader
}
ShaderEffectSource {
id: level2
width: level1.width / 2
height: level1.height / 2
sourceItem: effect1
hideSource: rootItem.visible
visible: false
smooth: true
}
ShaderEffect {
id: effect2
property variant source: level2
property real yStep: 1/height
property real xStep: 1/width
anchors.fill: level3
visible: false
smooth: true
vertexShader: __internalBlurVertexShader
fragmentShader: __internalBlurFragmentShader
}
ShaderEffectSource {
id: level3
width: level2.width / 2
height: level2.height / 2
sourceItem: effect2
hideSource: rootItem.visible
visible: false
smooth: true
}
ShaderEffect {
id: effect3
property variant source: level3
property real yStep: 1/height
property real xStep: 1/width
anchors.fill: level4
visible: false
smooth: true
vertexShader: __internalBlurVertexShader
fragmentShader: __internalBlurFragmentShader
}
ShaderEffectSource {
id: level4
width: level3.width / 2
height: level3.height / 2
sourceItem: effect3
hideSource: rootItem.visible
visible: false
smooth: true
}
ShaderEffect {
id: effect4
property variant source: level4
property real yStep: 1/height
property real xStep: 1/width
anchors.fill: level5
visible: false
smooth: true
vertexShader: __internalBlurVertexShader
fragmentShader: __internalBlurFragmentShader
}
ShaderEffectSource {
id: level5
width: level4.width / 2
height: level4.height / 2
sourceItem: effect4
hideSource: rootItem.visible
visible: false
smooth: true
}
ShaderEffect {
id: effect5
property variant source: level5
property real yStep: 1/height
property real xStep: 1/width
anchors.fill: level6
visible: false
smooth: true
vertexShader: __internalBlurVertexShader
fragmentShader: __internalBlurFragmentShader
}
ShaderEffectSource {
id: level6
width: level5.width / 2
height: level5.height / 2
sourceItem: effect5
hideSource: rootItem.visible
visible: false
smooth: true
}
Item {
id: dummysource
width: 1
height: 1
visible: false
}
ShaderEffectSource {
id: dummy
width: 1
height: 1
sourceItem: dummysource
visible: false
smooth: false
live: false
}
ShaderEffect {
id: shaderItem
x: transparentBorder ? -64 : 0
y: transparentBorder ? -64 : 0
width: transparentBorder ? parent.width + 128 : parent.width
height: transparentBorder ? parent.height + 128 : parent.height
property variant source1: level1
property variant source2: level2
property variant source3: level3
property variant source4: level4
property variant source5: level5
property variant source6: level6
property real lod: rootItem.blur
property real weight1;
property real weight2;
property real weight3;
property real weight4;
property real weight5;
property real weight6;
property real spread: 1.0 - (rootItem.spread * 0.98)
property alias color: rootItem.color
function weight(v) {
if (v <= 0.0)
return 1
if (v >= 0.5)
return 0
return 1.0 - v / 0.5
}
function calculateWeights() {
var w1 = weight(Math.abs(lod - 0.100))
var w2 = weight(Math.abs(lod - 0.300))
var w3 = weight(Math.abs(lod - 0.500))
var w4 = weight(Math.abs(lod - 0.700))
var w5 = weight(Math.abs(lod - 0.900))
var w6 = weight(Math.abs(lod - 1.100))
var sum = w1 + w2 + w3 + w4 + w5 + w6;
weight1 = w1 / sum;
weight2 = w2 / sum;
weight3 = w3 / sum;
weight4 = w4 / sum;
weight5 = w5 / sum;
weight6 = w6 / sum;
upateSources()
}
function upateSources() {
var sources = new Array();
var weights = new Array();
if (weight1 > 0) {
sources.push(level1)
weights.push(weight1)
}
if (weight2 > 0) {
sources.push(level2)
weights.push(weight2)
}
if (weight3 > 0) {
sources.push(level3)
weights.push(weight3)
}
if (weight4 > 0) {
sources.push(level4)
weights.push(weight4)
}
if (weight5 > 0) {
sources.push(level5)
weights.push(weight5)
}
if (weight6 > 0) {
sources.push(level6)
weights.push(weight6)
}
for (var j = sources.length; j < 6; j++) {
sources.push(dummy)
weights.push(0.0)
}
source1 = sources[0]
source2 = sources[1]
source3 = sources[2]
source4 = sources[3]
source5 = sources[4]
source6 = sources[5]
weight1 = weights[0]
weight2 = weights[1]
weight3 = weights[2]
weight4 = weights[3]
weight5 = weights[4]
weight6 = weights[5]
}
Component.onCompleted: calculateWeights()
onLodChanged: calculateWeights()
fragmentShader: "
uniform lowp sampler2D source1;
uniform lowp sampler2D source2;
uniform lowp sampler2D source3;
uniform lowp sampler2D source4;
uniform lowp sampler2D source5;
uniform mediump float weight1;
uniform mediump float weight2;
uniform mediump float weight3;
uniform mediump float weight4;
uniform mediump float weight5;
uniform highp vec4 color;
uniform highp float spread;
uniform lowp float qt_Opacity;
varying mediump vec2 qt_TexCoord0;
highp float linearstep(highp float e0, highp float e1, highp float x) {
return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
}
void main() {
lowp vec4 sourceColor = texture2D(source1, qt_TexCoord0) * weight1;
sourceColor += texture2D(source2, qt_TexCoord0) * weight2;
sourceColor += texture2D(source3, qt_TexCoord0) * weight3;
sourceColor += texture2D(source4, qt_TexCoord0) * weight4;
sourceColor += texture2D(source5, qt_TexCoord0) * weight5;
sourceColor = mix(vec4(0), color, linearstep(0.0, spread, sourceColor.a));
gl_FragColor = sourceColor * qt_Opacity;
}
"
}
}
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