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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 RecursiveBlur
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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-blur
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\brief Blurs repeatedly, providing a strong blur effect.
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The RecursiveBlur effect softens the image by blurring it with an algorithm
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that uses a recursive feedback loop to blur the source multiple times. The
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effect may give more blurry results than
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\l{QtGraphicalEffects::GaussianBlur}{GaussianBlur} or
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\l{QtGraphicalEffects::FastBlur}{FastBlur}, but the result is produced
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asynchronously and takes more time.
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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 RecursiveBlur_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 RecursiveBlur-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 distance of neighboring pixels which influence
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the blurring of individual pixels. A larger radius provides better
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quality, but is slower to render.
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\b Note: The radius value in this effect is not intended to be changed
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or animated frequently. The correct way to use it is to set the correct
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value and keep it unchanged for the whole duration of the iterative blur
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sequence.
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The value ranges from (no blur) to 16.0 (maximum blur step). By default,
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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 radius values
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\li
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\li
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\row
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\li \image RecursiveBlur_radius1.png
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\li \image RecursiveBlur_radius2.png
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\li \image RecursiveBlur_radius3.png
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\row
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\li \b { radius: 2.5 }
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\li \b { radius: 4.5 }
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\li \b { radius: 7.5 }
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\row
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\li \l loops: 20
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\li \l loops: 20
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\li \l loops: 20
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\endtable
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*/
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property real radius: 0.0
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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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/*!
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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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\table
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\header
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\li Output examples with different transparentBorder values
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\li
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\li
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\row
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\li \image RecursiveBlur_transparentBorder1.png
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\li \image RecursiveBlur_transparentBorder2.png
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\row
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\li \b { transparentBorder: false }
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\li \b { transparentBorder: true }
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\row
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\li \l loops: 20
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\li \l loops: 20
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\row
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\li \l radius: 7.5
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\li \l radius: 7.5
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\endtable
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*/
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property bool transparentBorder: false
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/*!
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This property defines the amount of blur iterations that are going to be
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performed for the source. When the property changes, the iterative
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blurring process starts. If the value is decreased or if the value
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changes from zero to non-zero, a snapshot is taken from the source. The
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snapshot is used as a starting point for the process.
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The iteration loop tries to run as fast as possible. The speed might be
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limited by the VSYNC or the time needed for one blur step, or both.
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Sometimes it may be desirable to perform the blurring with a slower
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pace. In that case, it may be convenient to control the property with
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Animation which increases the value.
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The value ranges from 0 to inf. By default, the property is set to \c 0.
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\table
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\header
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\li Output examples with different loops values
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\li
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\li
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\row
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\li \image RecursiveBlur_loops1.png
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\li \image RecursiveBlur_loops2.png
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\li \image RecursiveBlur_loops3.png
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\row
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\li \b { loops: 4 }
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\li \b { loops: 20 }
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\li \b { loops: 70 }
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\row
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\li \l radius: 7.5
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\li \l radius: 7.5
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\li \l radius: 7.5
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\endtable
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*/
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property int loops: 0
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/*!
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This property holds the progress of asynchronous source blurring
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process, from 0.0 (nothing blurred) to 1.0 (finished).
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*/
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property real progress: loops > 0.0 ? Math.min(1.0, recursionTimer.counter / loops) : 0.0
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onLoopsChanged: recursiveSource.scheduleUpdate()
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onSourceChanged: recursionTimer.reset()
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onRadiusChanged: recursionTimer.reset()
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onTransparentBorderChanged: recursionTimer.reset()
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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, parent.height + 2) : 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: verticalBlur
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smooth: true
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visible: rootItem.cached
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hideSource: visible
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live: true
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sourceItem: inputItem.visible ? inputItem : verticalBlur
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}
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Item {
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id: recursionTimer
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property int counter: 0
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function reset() {
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counter = 0
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recursiveSource.scheduleUpdate()
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}
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function nextFrame() {
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if (loops < counter)
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recursionTimer.counter = 0
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if (counter > 0)
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recursiveSource.sourceItem = verticalBlur
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else
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recursiveSource.sourceItem = inputItem
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if (counter < loops) {
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recursiveSource.scheduleUpdate()
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counter++
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}
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}
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}
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ShaderEffect {
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id: inputItem
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property variant source: sourceProxy.output
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property real expandX: rootItem.transparentBorder ? (horizontalBlur.maximumRadius) / horizontalBlur.width : 0.0
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property real expandY: rootItem.transparentBorder ? (horizontalBlur.maximumRadius) / horizontalBlur.height : 0.0
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anchors.fill: verticalBlur
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visible: !verticalBlur.visible
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vertexShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/recursiveblur.vert"
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fragmentShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/recursiveblur.frag"
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}
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ShaderEffectSource {
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id: recursiveSource
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visible: false
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smooth: true
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hideSource: false
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live: false
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sourceItem: inputItem
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recursive: true
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onSourceItemChanged: scheduleUpdate()
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onScheduledUpdateCompleted: recursionTimer.nextFrame()
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}
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GaussianDirectionalBlur {
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id: verticalBlur
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x: rootItem.transparentBorder ? -horizontalBlur.maximumRadius - 1 : 0
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y: rootItem.transparentBorder ? -horizontalBlur.maximumRadius - 1 : 0
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width: horizontalBlur.width + 2
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height: horizontalBlur.height + 2
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horizontalStep: 0.0
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verticalStep: 1.0 / parent.height
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source: ShaderEffectSource {
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sourceItem: horizontalBlur
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hideSource: true
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visible: false
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smooth: true
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}
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deviation: (radius + 1) / 2.3333
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radius: rootItem.radius
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maximumRadius: Math.ceil(rootItem.radius)
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transparentBorder: false
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visible: loops > 0
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}
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GaussianDirectionalBlur {
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id: horizontalBlur
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width: rootItem.transparentBorder ? parent.width + 2 * maximumRadius + 2 : parent.width
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height: rootItem.transparentBorder ? parent.height + 2 * maximumRadius + 2 : parent.height
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horizontalStep: 1.0 / parent.width
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verticalStep: 0.0
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source: recursiveSource
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deviation: (radius + 1) / 2.3333
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radius: rootItem.radius
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maximumRadius: Math.ceil(rootItem.radius)
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transparentBorder: false
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visible: false
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}
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}
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