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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** 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 Nokia Corporation 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 "internal"
Item {
id: rootItem
property variant source
property real angle: 0.0
property int samples: 0
property real horizontalOffset: 0.0
property real verticalOffset: 0.0
property bool transparentBorder: false
property bool cached: false
SourceProxy {
id: sourceProxy
input: rootItem.source
sourceRect: shaderItem.transparentBorder ? Qt.rect(-1, -1, parent.width + 2.0, parent.height + 2.0) : Qt.rect(0, 0, 0, 0)
}
ShaderEffectSource {
id: cacheItem
anchors.fill: shaderItem
visible: rootItem.cached
smooth: true
sourceItem: shaderItem
live: true
hideSource: visible
}
ShaderEffect {
id: shaderItem
property variant source: sourceProxy.output
property variant center: Qt.point(0.5 + rootItem.horizontalOffset / parent.width, 0.5 + rootItem.verticalOffset / parent.height)
property bool transparentBorder: rootItem.transparentBorder && rootItem.samples > 1
property int samples: rootItem.samples
property real weight: 1.0 / Math.max(1.0, rootItem.samples)
property real angleSin: Math.sin(rootItem.angle/2 * Math.PI/180)
property real angleCos: Math.cos(rootItem.angle/2 * Math.PI/180)
property real angleSinStep: Math.sin(-rootItem.angle * Math.PI/180 / Math.max(1.0, rootItem.samples - 1))
property real angleCosStep: Math.cos(-rootItem.angle * Math.PI/180 / Math.max(1.0, rootItem.samples - 1))
property variant expandPixels: transparentBorder ? Qt.size(0.5 * parent.height, 0.5 * parent.width) : Qt.size(0,0)
property variant expand: transparentBorder ? Qt.size(expandPixels.width / width, expandPixels.height / height) : Qt.size(0,0)
property variant delta: Qt.size(1.0 / rootItem.width, 1.0 / rootItem.height)
property real w: parent.width
property real h: parent.height
x: transparentBorder ? -expandPixels.width - 1 : 0
y: transparentBorder ? -expandPixels.height - 1 : 0
width: transparentBorder ? parent.width + expandPixels.width * 2.0 + 2 : parent.width
height: transparentBorder ? parent.height + expandPixels.height * 2.0 + 2 : parent.height
property string fragmentShaderSkeleton: "
varying highp vec2 qt_TexCoord0;
uniform highp float qt_Opacity;
uniform sampler2D source;
uniform highp float angleSin;
uniform highp float angleCos;
uniform highp float angleSinStep;
uniform highp float angleCosStep;
uniform highp float weight;
uniform highp vec2 expand;
uniform highp vec2 center;
uniform highp vec2 delta;
uniform highp float w;
uniform highp float h;
void main(void) {
highp mat2 m;
gl_FragColor = vec4(0.0);
mediump vec2 texCoord = qt_TexCoord0;
PLACEHOLDER_EXPAND_STEPS
highp vec2 dir = vec2(texCoord.s * w - w * center.x, texCoord.t * h - h * center.y);
m[0] = vec2(angleCos, -angleSin);
m[1] = vec2(angleSin, angleCos);
dir *= m;
m[0] = vec2(angleCosStep, -angleSinStep);
m[1] = vec2(angleSinStep, angleCosStep);
PLACEHOLDER_UNROLLED_LOOP
gl_FragColor *= qt_Opacity;
}
"
function buildFragmentShader() {
var shader = fragmentShaderSkeleton
var expandSteps = ""
if (transparentBorder) {
expandSteps += "texCoord.s = (texCoord.s - expand.x) / (1.0 - 2.0 * expand.x);"
expandSteps += "texCoord.t = (texCoord.t - expand.y) / (1.0 - 2.0 * expand.y);"
}
var unrolledLoop = "gl_FragColor += texture2D(source, texCoord);\n"
if (rootItem.samples > 1) {
unrolledLoop = ""
for (var i = 0; i < rootItem.samples; i++)
unrolledLoop += "texCoord = vec2(center.x + dir.x * delta.x, center.y + dir.y * delta.y); gl_FragColor += texture2D(source, texCoord) * weight; dir *= m;\n"
}
shader = shader.replace("PLACEHOLDER_EXPAND_STEPS", expandSteps)
fragmentShader = shader.replace("PLACEHOLDER_UNROLLED_LOOP", unrolledLoop)
}
onFragmentShaderChanged: sourceChanged()
onSamplesChanged: buildFragmentShader()
onTransparentBorderChanged: buildFragmentShader()
Component.onCompleted: buildFragmentShader()
}
}
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