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Diffstat (limited to 'src/effects/GaussianBlur.qml')
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diff --git a/src/effects/GaussianBlur.qml b/src/effects/GaussianBlur.qml deleted file mode 100644 index 4af9714..0000000 --- a/src/effects/GaussianBlur.qml +++ /dev/null @@ -1,372 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2017 The Qt Company Ltd. -** Copyright (C) 2017 Jolla Ltd, author: <gunnar.sletta@jollamobile.com> -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the Qt Graphical Effects module. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 3 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL3 included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 3 requirements -** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 2.0 or (at your option) the GNU General -** Public license version 3 or any later version approved by the KDE Free -** Qt Foundation. The licenses are as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-2.0.html and -** https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -import QtQuick 2.12 -import QtQuick.Window 2.12 -import QtGraphicalEffects.private 1.12 - -/*! - \qmltype GaussianBlur - \inqmlmodule QtGraphicalEffects - \since QtGraphicalEffects 1.0 - \inherits QtQuick2::Item - \ingroup qtgraphicaleffects-blur - \brief Applies a higher quality blur effect. - - GaussianBlur effect softens the image by blurring it with an algorithm that - uses the Gaussian function to calculate the effect. The effect produces - higher quality than \l{QtGraphicalEffects::FastBlur}{FastBlur}, but is - slower to render. - - \table - \header - \li Source - \li Effect applied - \row - \li \image Original_bug.png - \li \image GaussianBlur_bug.png - \endtable - - \note This effect is available when running with OpenGL. - - \section1 Example - - The following example shows how to apply the effect. - \snippet GaussianBlur-example.qml example - - Performing blur live is a costly operation. Fullscreen gaussian blur - with even a moderate number of samples will only run at 60 fps on highend - graphics hardware. - -*/ -Item { - id: root - - /*! - This property defines the source item that is going to be blurred. - - \note It is not supported to let the effect include itself, for - instance by setting source to the effect's parent. - */ - property variant source - - /*! - This property defines the distance of the neighboring pixels which - affect the blurring of an individual pixel. A larger radius increases - the blur effect. - - The ideal blur is achieved by selecting \c samples and \c radius such - that \c {samples = 1 + radius * 2}, such as: - - \table - \header \li Radius \li Samples - \row \li 0 \e{(no blur)} \li 1 - \row \li 1 \li 3 - \row \li 2 \li 5 - \row \li 3 \li 7 - \endtable - - The value ranges from 0.0 (no blur) to inf. By default, the property is - set to \c floor(samples / 2.0). - - \table - \header - \li Output examples with different radius values - \li - \li - \row - \li \image GaussianBlur_radius1.png - \li \image GaussianBlur_radius2.png - \li \image GaussianBlur_radius3.png - \row - \li \b { radius: 0 } - \li \b { radius: 4 } - \li \b { radius: 8 } - \row - \li \l samples: 16 - \li \l samples: 16 - \li \l samples: 16 - \row - \li \l deviation: 3 - \li \l deviation: 3 - \li \l deviation: 3 - \endtable - - */ - property real radius: Math.floor(samples / 2); - - /*! - This property defines how many samples are taken per pixel when blur - calculation is done. Larger value produces better quality, but is slower - to render. - - Ideally, this value should be twice as large as the highest required - radius value plus 1, for example, if the radius is animated between 0.0 - and 4.0, samples should be set to 9. - - By default, the property is set to \c 9. - - \note This property is not intended to be animated. Changing this property may - cause the underlying OpenGL shaders to be recompiled. - - */ - property int samples: 9 - - /*! - This property is a parameter to the gaussian function that is used when - calculating neighboring pixel weights for the blurring. A larger - deviation causes image to appear more blurry, but it also reduces the - quality of the blur. A very large deviation value causes the effect to - look a bit similar to what, for exmple, a box blur algorithm produces. A - too small deviation values makes the effect insignificant for the pixels - near the radius. - - \inlineimage GaussianBlur_deviation_graph.png - \caption The image above shows the Gaussian function with two different - deviation values, yellow (1) and cyan (2.7). The y-axis shows the - weights, the x-axis shows the pixel distance. - - The value ranges from 0.0 (no deviation) to inf (maximum deviation). By - default, devaition is binded to radius. When radius increases, deviation - is automatically increased linearly. With the radius value of 8, the - deviation default value becomes approximately 2.7034. This value - produces a compromise between the blur quality and overall blurriness. - - \table - \header - \li Output examples with different deviation values - \li - \li - \row - \li \image GaussianBlur_deviation1.png - \li \image GaussianBlur_deviation2.png - \li \image GaussianBlur_deviation3.png - \row - \li \b { deviation: 1 } - \li \b { deviation: 2 } - \li \b { deviation: 4 } - \row - \li \l radius: 8 - \li \l radius: 8 - \li \l radius: 8 - \row - \li \l samples: 16 - \li \l samples: 16 - \li \l samples: 16 - \endtable - - */ - property real deviation: (radius + 1) / 3.3333 - - /*! - This property defines the blur behavior near the edges of the item, - where the pixel blurring is affected by the pixels outside the source - edges. - - If the property is set to \c true, the pixels outside the source are - interpreted to be transparent, which is similar to OpenGL - clamp-to-border extension. The blur is expanded slightly outside the - effect item area. - - If the property is set to \c false, the pixels outside the source are - interpreted to contain the same color as the pixels at the edge of the - item, which is similar to OpenGL clamp-to-edge behavior. The blur does - not expand outside the effect item area. - - By default, the property is set to \c false. - - \table - \header - \li Output examples with different transparentBorder values - \li - \li - \row - \li \image GaussianBlur_transparentBorder1.png - \li \image GaussianBlur_transparentBorder2.png - \row - \li \b { transparentBorder: false } - \li \b { transparentBorder: true } - \row - \li \l radius: 8 - \li \l radius: 8 - \row - \li \l samples: 16 - \li \l samples: 16 - \row - \li \l deviation: 2.7 - \li \l deviation: 2.7 - \endtable - */ - property bool transparentBorder: false - - /*! - This property allows the effect output pixels to be cached in order to - improve the rendering performance. - Every time the source or effect properties are changed, the pixels in - the cache must be updated. Memory consumption is increased, because an - extra buffer of memory is required for storing the effect output. - - It is recommended to disable the cache when the source or the effect - properties are animated. - - By default, the property is set to \c false. - - */ - property bool cached: false - - - // private members... - /*! \internal */ - property int _paddedTexWidth: transparentBorder ? width + 2 * radius: width; - /*! \internal */ - property int _paddedTexHeight: transparentBorder ? height + 2 * radius: height; - /*! \internal */ - property int _kernelRadius: Math.max(0, samples / 2); - /*! \internal */ - property int _kernelSize: _kernelRadius * 2 + 1; - /*! \internal */ - property real _dpr: Screen.devicePixelRatio; - /*! \internal */ - property bool _alphaOnly: false; - /*! \internal */ - property var _maskSource: undefined - - /*! \internal */ - property alias _output: sourceProxy.output; - /*! \internal */ - property alias _outputRect: sourceProxy.sourceRect; - /*! \internal */ - property alias _color: verticalBlur.color; - /*! \internal */ - property real _thickness: 0; - - onSamplesChanged: _rebuildShaders(); - on_KernelSizeChanged: _rebuildShaders(); - onDeviationChanged: _rebuildShaders(); - on_DprChanged: _rebuildShaders(); - on_MaskSourceChanged: _rebuildShaders(); - Component.onCompleted: _rebuildShaders(); - - /*! \internal */ - function _rebuildShaders() { - var params = { - radius: _kernelRadius, - // Limit deviation to something very small avoid getting NaN in the shader. - deviation: Math.max(0.00001, deviation), - alphaOnly: root._alphaOnly, - masked: _maskSource != undefined, - fallback: root.radius != _kernelRadius - } - var shaders = ShaderBuilder.gaussianBlur(params); - horizontalBlur.fragmentShader = shaders.fragmentShader; - horizontalBlur.vertexShader = shaders.vertexShader; - } - - SourceProxy { - id: sourceProxy - interpolation: SourceProxy.LinearInterpolation - input: root.source - sourceRect: root.transparentBorder - ? Qt.rect(-root.radius, 0, root._paddedTexWidth, parent.height) - : Qt.rect(0, 0, 0, 0) - } - - ShaderEffect { - id: horizontalBlur - width: root.transparentBorder ? root._paddedTexWidth : root.width - height: root.height; - - // Used by all shaders - property Item source: sourceProxy.output; - property real spread: root.radius / root._kernelRadius; - property var dirstep: Qt.vector2d(1 / (root._paddedTexWidth * root._dpr), 0); - - // Used by fallback shader (sampleCount exceeds number of varyings) - property real deviation: root.deviation - - // Only in use for DropShadow and Glow - property color color: "white" - property real thickness: Math.max(0, Math.min(0.98, 1 - root._thickness * 0.98)); - - // Only in use for MaskedBlur - property var mask: root._maskSource; - - layer.enabled: true - layer.smooth: true - layer.sourceRect: root.transparentBorder - ? Qt.rect(0, -root.radius, width, root._paddedTexHeight) - : Qt.rect(0, 0, 0, 0) - visible: false - blending: false - } - - ShaderEffect { - id: verticalBlur - x: transparentBorder ? -root.radius : 0 - y: x; - width: root.transparentBorder ? root._paddedTexWidth: root.width - height: root.transparentBorder ? root._paddedTexHeight : root.height; - fragmentShader: horizontalBlur.fragmentShader - vertexShader: horizontalBlur.vertexShader - - property Item source: horizontalBlur - property real spread: horizontalBlur.spread - property var dirstep: Qt.vector2d(0, 1 / (root._paddedTexHeight * root._dpr)); - - property real deviation: horizontalBlur.deviation - - property color color: "black" - property real thickness: horizontalBlur.thickness; - - property var mask: horizontalBlur.mask; - - visible: true - } - - ShaderEffectSource { - id: cacheItem - anchors.fill: verticalBlur - visible: root.cached - smooth: true - sourceItem: verticalBlur - hideSource: visible - } - -} |