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Sven Riwoldt
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/****************************************************************************
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**
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** Copyright (C) 2017 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Graphical Effects module.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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import QtQuick 2.12
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import QtGraphicalEffects.private 1.12
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/*!
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\qmltype DirectionalBlur
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\inqmlmodule QtGraphicalEffects
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\since QtGraphicalEffects 1.0
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\inherits QtQuick2::Item
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\ingroup qtgraphicaleffects-motion-blur
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\brief Applies blur effect to the specified direction.
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Effect creates perceived impression that the source item appears to be
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moving in the direction of the blur. Blur is applied to both sides of
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each pixel, therefore setting the direction to 0 and 180 provides the
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same result.
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Other available motionblur effects are \l{QtGraphicalEffects::ZoomBlur}{ZoomBlur} and
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\l{QtGraphicalEffects::RadialBlur}{RadialBlur}.
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\table
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\header
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\li Source
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\li Effect applied
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\row
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\li \image Original_bug.png
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\li \image DirectionalBlur_bug.png
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\endtable
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\note This effect is available when running with OpenGL.
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\section1 Example
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The following example shows how to apply the effect.
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\snippet DirectionalBlur-example.qml example
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*/
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Item {
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id: rootItem
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/*!
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This property defines the source item that is going to be blurred.
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\note It is not supported to let the effect include itself, for
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instance by setting source to the effect's parent.
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*/
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property variant source
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/*!
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This property defines the perceived amount of movement for each pixel.
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The movement is divided evenly to both sides of each pixel.
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The quality of the blur depends on \l{DirectionalBlur::samples}{samples}
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property. If length value is large, more samples are needed to keep the
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visual quality at high level.
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The value ranges from 0.0 to inf.
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By default the property is set to \c 0.0 (no blur).
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\table
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\header
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\li Output examples with different length values
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\li
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\li
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\row
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\li \image DirectionalBlur_length1.png
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\li \image DirectionalBlur_length2.png
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\li \image DirectionalBlur_length3.png
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\row
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\li \b { length: 0.0 }
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\li \b { length: 32.0 }
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\li \b { length: 48.0 }
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\row
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\li \l samples: 24
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\li \l samples: 24
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\li \l samples: 24
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\row
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\li \l angle: 0
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\li \l angle: 0
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\li \l angle: 0
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\endtable
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*/
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property real length: 0.0
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/*!
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This property defines how many samples are taken per pixel when blur
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calculation is done. Larger value produces better quality, but is slower
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to render.
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This property is not intended to be animated. Changing this property may
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cause the underlying OpenGL shaders to be recompiled.
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Allowed values are between 0 and inf (practical maximum depends on GPU).
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By default the property is set to \c 0 (no samples).
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*/
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property int samples: 0
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/*!
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This property defines the direction for the blur. Blur is applied to
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both sides of each pixel, therefore setting the direction to 0 and 180
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produces the same result.
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The value ranges from -180.0 to 180.0.
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By default the property is set to \c 0.0.
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\table
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\header
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\li Output examples with different angle values
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\li
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\li
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\row
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\li \image DirectionalBlur_angle1.png
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\li \image DirectionalBlur_angle2.png
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\li \image DirectionalBlur_angle3.png
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\row
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\li \b { angle: 0.0 }
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\li \b { angle: 45.0 }
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\li \b { angle: 90.0 }
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\row
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\li \l samples: 24
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\li \l samples: 24
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\li \l samples: 24
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\row
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\li \l length: 32
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\li \l length: 32
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\li \l length: 32
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\endtable
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*/
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property real angle: 0.0
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/*!
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This property defines the blur behavior near the edges of the item,
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where the pixel blurring is affected by the pixels outside the source
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edges.
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If the property is set to \c true, the pixels outside the source are
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interpreted to be transparent, which is similar to OpenGL
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clamp-to-border extension. The blur is expanded slightly outside the
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effect item area.
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If the property is set to \c false, the pixels outside the source are
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interpreted to contain the same color as the pixels at the edge of the
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item, which is similar to OpenGL clamp-to-edge behavior. The blur does
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not expand outside the effect item area.
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By default, the property is set to \c false.
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*/
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property bool transparentBorder: false
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/*!
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This property allows the effect output pixels to be cached in order to
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improve the rendering performance.
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Every time the source or effect properties are changed, the pixels in
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the cache must be updated. Memory consumption is increased, because an
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extra buffer of memory is required for storing the effect output.
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It is recommended to disable the cache when the source or the effect
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properties are animated.
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By default, the property is set to \c false.
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*/
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property bool cached: false
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SourceProxy {
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id: sourceProxy
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input: rootItem.source
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sourceRect: rootItem.transparentBorder ? Qt.rect(-1, -1, parent.width + 2.0, parent.height + 2.0) : Qt.rect(0, 0, 0, 0)
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}
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ShaderEffectSource {
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id: cacheItem
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anchors.fill: shaderItem
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visible: rootItem.cached
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smooth: true
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sourceItem: shaderItem
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live: true
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hideSource: visible
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}
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ShaderEffect {
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id: shaderItem
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property variant source: sourceProxy.output
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property real len: rootItem.length
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property bool transparentBorder: rootItem.transparentBorder
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property real samples: rootItem.samples
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property real weight: 1.0 / Math.max(1.0, rootItem.samples)
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property variant expandPixels: transparentBorder ? Qt.size(rootItem.samples, rootItem.samples) : Qt.size(0,0)
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property variant expand: transparentBorder ? Qt.size(expandPixels.width / width, expandPixels.height / height) : Qt.size(0,0)
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property variant delta: Qt.size(1.0 / rootItem.width * Math.cos((rootItem.angle + 90) * Math.PI/180), 1.0 / rootItem.height * Math.sin((rootItem.angle + 90) * Math.PI/180))
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x: transparentBorder ? -expandPixels.width - 1: 0
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y: transparentBorder ? -expandPixels.height - 1 : 0
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width: transparentBorder ? parent.width + 2.0 * expandPixels.width + 2 : parent.width
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height: transparentBorder ? parent.height + 2.0 * expandPixels.height + 2 : parent.height
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property string fragmentShaderSkeleton: "
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varying highp vec2 qt_TexCoord0;
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uniform highp float qt_Opacity;
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uniform lowp sampler2D source;
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uniform highp float len;
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uniform highp float samples;
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uniform highp float weight;
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uniform highp vec2 expand;
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uniform highp vec2 delta;
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void main(void) {
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highp vec2 shift = delta * len / max(1.0, samples - 1.0);
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mediump vec2 texCoord = qt_TexCoord0;
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gl_FragColor = vec4(0.0);
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PLACEHOLDER_EXPAND_STEPS
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texCoord -= shift * max(0.0, samples - 1.0) * 0.5;
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PLACEHOLDER_UNROLLED_LOOP
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gl_FragColor *= weight * qt_Opacity;
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}
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"
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function buildFragmentShader() {
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var shader = ""
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if (GraphicsInfo.profile === GraphicsInfo.OpenGLCoreProfile)
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shader += "#version 150 core\n#define varying in\n#define texture2D texture\nout vec4 fragColor;\n#define gl_FragColor fragColor\n"
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shader += fragmentShaderSkeleton
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var expandSteps = ""
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if (transparentBorder) {
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expandSteps += "texCoord = (texCoord - expand) / (1.0 - 2.0 * expand);"
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}
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var unrolledLoop = "gl_FragColor += texture2D(source, texCoord);\n"
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if (rootItem.samples > 1) {
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unrolledLoop = ""
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for (var i = 0; i < rootItem.samples; i++)
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unrolledLoop += "gl_FragColor += texture2D(source, texCoord); texCoord += shift;\n"
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}
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shader = shader.replace("PLACEHOLDER_EXPAND_STEPS", expandSteps)
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fragmentShader = shader.replace("PLACEHOLDER_UNROLLED_LOOP", unrolledLoop)
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}
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onFragmentShaderChanged: sourceChanged()
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onSamplesChanged: buildFragmentShader()
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onTransparentBorderChanged: buildFragmentShader()
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Component.onCompleted: buildFragmentShader()
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}
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}
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