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This commit is contained in:
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 FastBlur
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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 Applies a fast blur effect to one or more source items.
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FastBlur offers lower blur quality than
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\l{QtGraphicalEffects::GaussianBlur}{GaussianBlur}, but it is faster to
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render. The FastBlur effect softens the source content by blurring it with
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algorithm which uses the source content downscaling and bilinear filtering.
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Use this effect in situations where the source content is rapidly changing
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and the highest possible blur quality is not
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needed.
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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 FastBlur_bug.png
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\endtable
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\note This effect is available when running with OpenGL.
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s
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\section1 Example
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The following example shows how to apply the effect.
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\snippet FastBlur-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 the neighboring pixels which affect
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the blurring of an individual pixel. A larger radius increases the blur
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effect. FastBlur algorithm may internally reduce the accuracy of the radius in order to
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provide good rendering performance.
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The value ranges from 0.0 (no blur) to inf. Visual quality of the blur is reduced when
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radius exceeds value 64. 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 blur values
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\li
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\li
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\row
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\li \image FastBlur_radius1.png
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\li \image FastBlur_radius2.png
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\li \image FastBlur_radius3.png
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\row
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\li \b { radius: 0 }
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\li \b { radius: 32 }
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\li \b { radius: 64 }
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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 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 FastBlur_transparentBorder1.png
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\li \image FastBlur_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 radius: 64
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\li \l radius: 64
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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 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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}
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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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sourceItem: shaderItem
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live: true
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hideSource: visible
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smooth: rootItem.radius > 0
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}
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/*! \internal */
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property string __internalBlurVertexShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/fastblur_internal.vert"
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/*! \internal */
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property string __internalBlurFragmentShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/fastblur_internal.frag"
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ShaderEffect {
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id: level0
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property variant source: sourceProxy.output
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anchors.fill: parent
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visible: false
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smooth: true
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}
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ShaderEffectSource {
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id: level1
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width: Math.ceil(shaderItem.width / 32) * 32
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height: Math.ceil(shaderItem.height / 32) * 32
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sourceItem: level0
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hideSource: rootItem.visible
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sourceRect: transparentBorder ? Qt.rect(-64, -64, shaderItem.width, shaderItem.height) : Qt.rect(0, 0, 0, 0)
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visible: false
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smooth: rootItem.radius > 0
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}
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ShaderEffect {
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id: effect1
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property variant source: level1
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property real yStep: 1/height
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property real xStep: 1/width
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anchors.fill: level2
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visible: false
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smooth: true
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vertexShader: __internalBlurVertexShader
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fragmentShader: __internalBlurFragmentShader
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}
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ShaderEffectSource {
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id: level2
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width: level1.width / 2
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height: level1.height / 2
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sourceItem: effect1
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hideSource: rootItem.visible
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visible: false
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smooth: true
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}
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ShaderEffect {
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id: effect2
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property variant source: level2
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property real yStep: 1/height
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property real xStep: 1/width
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anchors.fill: level3
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visible: false
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smooth: true
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vertexShader: __internalBlurVertexShader
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fragmentShader: __internalBlurFragmentShader
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}
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ShaderEffectSource {
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id: level3
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width: level2.width / 2
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height: level2.height / 2
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sourceItem: effect2
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hideSource: rootItem.visible
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visible: false
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smooth: true
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}
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ShaderEffect {
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id: effect3
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property variant source: level3
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property real yStep: 1/height
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property real xStep: 1/width
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anchors.fill: level4
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visible: false
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smooth: true
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vertexShader: __internalBlurVertexShader
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fragmentShader: __internalBlurFragmentShader
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}
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ShaderEffectSource {
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id: level4
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width: level3.width / 2
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height: level3.height / 2
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sourceItem: effect3
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hideSource: rootItem.visible
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visible: false
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smooth: true
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}
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ShaderEffect {
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id: effect4
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property variant source: level4
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property real yStep: 1/height
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property real xStep: 1/width
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anchors.fill: level5
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visible: false
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smooth: true
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vertexShader: __internalBlurVertexShader
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fragmentShader: __internalBlurFragmentShader
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}
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ShaderEffectSource {
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id: level5
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width: level4.width / 2
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height: level4.height / 2
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sourceItem: effect4
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hideSource: rootItem.visible
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visible: false
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smooth: true
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}
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ShaderEffect {
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id: effect5
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property variant source: level5
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property real yStep: 1/height
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property real xStep: 1/width
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anchors.fill: level6
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visible: false
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smooth: true
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vertexShader: __internalBlurVertexShader
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fragmentShader: __internalBlurFragmentShader
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}
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ShaderEffectSource {
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id: level6
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width: level5.width / 2
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height: level5.height / 2
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sourceItem: effect5
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hideSource: rootItem.visible
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visible: false
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smooth: true
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}
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Item {
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id: dummysource
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width: 1
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height: 1
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visible: false
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}
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ShaderEffectSource {
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id: dummy
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width: 1
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height: 1
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sourceItem: dummysource
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visible: false
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smooth: false
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live: false
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}
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ShaderEffect {
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id: shaderItem
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property variant source1: level1
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property variant source2: level2
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property variant source3: level3
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property variant source4: level4
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property variant source5: level5
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property variant source6: level6
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property real lod: Math.sqrt(rootItem.radius / 64.0) * 1.2 - 0.2
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property real weight1
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property real weight2
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property real weight3
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property real weight4
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property real weight5
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property real weight6
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x: transparentBorder ? -64 : 0
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y: transparentBorder ? -64 : 0
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width: transparentBorder ? parent.width + 128 : parent.width
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height: transparentBorder ? parent.height + 128 : parent.height
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function weight(v) {
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if (v <= 0.0)
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return 1.0
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if (v >= 0.5)
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return 0.0
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return 1.0 - v * 2.0
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}
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function calculateWeights() {
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var w1 = weight(Math.abs(lod - 0.100))
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var w2 = weight(Math.abs(lod - 0.300))
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var w3 = weight(Math.abs(lod - 0.500))
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var w4 = weight(Math.abs(lod - 0.700))
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var w5 = weight(Math.abs(lod - 0.900))
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var w6 = weight(Math.abs(lod - 1.100))
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var sum = w1 + w2 + w3 + w4 + w5 + w6;
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weight1 = w1 / sum;
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weight2 = w2 / sum;
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weight3 = w3 / sum;
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weight4 = w4 / sum;
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weight5 = w5 / sum;
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weight6 = w6 / sum;
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upateSources()
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}
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function upateSources() {
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var sources = new Array();
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var weights = new Array();
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if (weight1 > 0) {
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sources.push(level1)
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weights.push(weight1)
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}
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if (weight2 > 0) {
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sources.push(level2)
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weights.push(weight2)
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}
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if (weight3 > 0) {
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sources.push(level3)
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weights.push(weight3)
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}
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if (weight4 > 0) {
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sources.push(level4)
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weights.push(weight4)
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}
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if (weight5 > 0) {
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sources.push(level5)
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weights.push(weight5)
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}
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if (weight6 > 0) {
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sources.push(level6)
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weights.push(weight6)
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}
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for (var j = sources.length; j < 6; j++) {
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sources.push(dummy)
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weights.push(0.0)
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}
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source1 = sources[0]
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source2 = sources[1]
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source3 = sources[2]
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source4 = sources[3]
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source5 = sources[4]
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source6 = sources[5]
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weight1 = weights[0]
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weight2 = weights[1]
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weight3 = weights[2]
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weight4 = weights[3]
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weight5 = weights[4]
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weight6 = weights[5]
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}
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Component.onCompleted: calculateWeights()
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onLodChanged: calculateWeights()
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fragmentShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/fastblur.frag"
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}
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}
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