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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 InnerShadow
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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-drop-shadow
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\brief Generates a colorized and blurred shadow inside the
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source.
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By default the effect produces a high quality shadow image, thus the
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rendering speed of the shadow might not be the highest possible. The
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rendering speed is reduced especially if the shadow edges are heavily
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softened. For use cases that require faster rendering speed and for which
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the highest possible visual quality is not necessary, property
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\l{InnerShadow::fast}{fast} can be set to true.
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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_butterfly.png
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\li \image InnerShadow_butterfly.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 InnerShadow-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 used as the
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source for the generated shadow.
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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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Radius defines the softness of the shadow. A larger radius causes the
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edges of the shadow to appear more blurry.
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Depending on the radius value, value of the
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\l{InnerShadow::samples}{samples} should be set to sufficiently large to
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ensure the visual quality.
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The value ranges from 0.0 (no blur) to inf. By default, the property is
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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 InnerShadow_radius1.png
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\li \image InnerShadow_radius2.png
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\li \image InnerShadow_radius3.png
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\row
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\li \b { radius: 0 }
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\li \b { radius: 6 }
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\li \b { radius: 12 }
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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 color: #000000
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\li \l color: #000000
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\li \l color: #000000
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\row
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\li \l horizontalOffset: 0
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\li \l horizontalOffset: 0
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\li \l horizontalOffset: 0
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\row
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\row
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\li \l spread: 0
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\li \l spread: 0
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\li \l spread: 0
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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 how many samples are taken per pixel when edge
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softening blur calculation is done. Larger value produces better
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quality, but is slower to render.
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Ideally, this value should be twice as large as the highest required
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radius value, for example, if the radius is animated between 0.0 and
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4.0, samples should be set to 8.
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The value ranges from 0 to 32. By default, the property is set to \c 0.
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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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When \l{InnerShadow::fast}{fast} property is set to true, this property
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has no effect.
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*/
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property int samples: 0
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/*!
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This property defines how large part of the shadow color is strengthened
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near the source edges.
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The value ranges from 0.0 to 1.0. By default, the property is set to \c
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0.5.
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\table
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\header
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\li Output examples with different spread values
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\li
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\li
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\row
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\li \image InnerShadow_spread1.png
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\li \image InnerShadow_spread2.png
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\li \image InnerShadow_spread3.png
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\row
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\li \b { spread: 0.0 }
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\li \b { spread: 0.3 }
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\li \b { spread: 0.5 }
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\row
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\li \l radius: 16
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\li \l radius: 16
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\li \l radius: 16
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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 color: #000000
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\li \l color: #000000
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\li \l color: #000000
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\row
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\li \l horizontalOffset: 0
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\li \l horizontalOffset: 0
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\li \l horizontalOffset: 0
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\row
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\endtable
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*/
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property real spread: 0.0
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/*!
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This property defines the RGBA color value which is used for the shadow.
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By default, the property is set to \c "black".
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\table
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\header
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\li Output examples with different color values
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\li
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\li
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\row
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\li \image InnerShadow_color1.png
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\li \image InnerShadow_color2.png
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\li \image InnerShadow_color3.png
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\row
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\li \b { color: #000000 }
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\li \b { color: #ffffff }
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\li \b { color: #ff0000 }
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\row
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\li \l radius: 16
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\li \l radius: 16
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\li \l radius: 16
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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 horizontalOffset: 0
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\li \l horizontalOffset: 0
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\li \l horizontalOffset: 0
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\row
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\row
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\li \l spread: 0.2
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\li \l spread: 0.2
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\li \l spread: 0.2
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\endtable
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*/
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property color color: "black"
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/*!
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\qmlproperty real QtGraphicalEffects::InnerShadow::horizontalOffset
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\qmlproperty real QtGraphicalEffects::InnerShadow::verticalOffset
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HorizontalOffset and verticalOffset properties define the offset for the
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rendered shadow compared to the InnerShadow item position. Often, the
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InnerShadow item is anchored so that it fills the source element. In
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this case, if the HorizontalOffset and verticalOffset properties are set
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to 0, the shadow is rendered fully inside the source item. By changing
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the offset properties, the shadow can be positioned relatively to the
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source item.
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The values range from -inf to inf. By default, the properties are set to
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\c 0.
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\table
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\header
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\li Output examples with different horizontalOffset values
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\li
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\li
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\row
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\li \image InnerShadow_horizontalOffset1.png
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\li \image InnerShadow_horizontalOffset2.png
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\li \image InnerShadow_horizontalOffset3.png
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\row
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\li \b { horizontalOffset: -20 }
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\li \b { horizontalOffset: 0 }
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\li \b { horizontalOffset: 20 }
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\row
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\li \l radius: 16
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\li \l radius: 16
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\li \l radius: 16
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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 color: #000000
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\li \l color: #000000
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\li \l color: #000000
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\row
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\row
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\li \l spread: 0
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\li \l spread: 0
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\li \l spread: 0
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\endtable
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*/
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property real horizontalOffset: 0
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property real verticalOffset: 0
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/*!
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This property selects the blurring algorithm that is used to produce the
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softness for the effect. Setting this to true enables fast algorithm,
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setting value to false produces higher quality result.
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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 fast values
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\li
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\li
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\row
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\li \image InnerShadow_fast1.png
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\li \image InnerShadow_fast2.png
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\row
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\li \b { fast: false }
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\li \b { fast: true }
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\row
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\li \l radius: 16
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\li \l radius: 16
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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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\row
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\li \l color: #000000
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\li \l color: #000000
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\row
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\li \l horizontalOffset: 0
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\li \l horizontalOffset: 0
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\row
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\li \l verticalOffset: 0
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\li \l verticalOffset: 0
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\row
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\li \l spread: 0.2
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\li \l spread: 0.2
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\endtable
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*/
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property bool fast: 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. Every time the source or effect
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properties are changed, the pixels in the cache must be updated. Memory
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consumption is increased, because an extra buffer of memory is required
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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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Loader {
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anchors.fill: parent
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sourceComponent: rootItem.fast ? innerShadow : gaussianInnerShadow
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}
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Component {
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id: gaussianInnerShadow
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GaussianInnerShadow {
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anchors.fill: parent
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source: rootItem.source
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radius: rootItem.radius
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maximumRadius: rootItem.samples * 0.5
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color: rootItem.color
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cached: rootItem.cached
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spread: rootItem.spread
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horizontalOffset: rootItem.horizontalOffset
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verticalOffset: rootItem.verticalOffset
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}
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}
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Component {
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id: innerShadow
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FastInnerShadow {
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anchors.fill: parent
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source: rootItem.source
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blur: Math.pow(rootItem.radius / 64.0, 0.4)
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color: rootItem.color
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cached: rootItem.cached
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spread: rootItem.spread
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horizontalOffset: rootItem.horizontalOffset
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verticalOffset: rootItem.verticalOffset
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}
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}
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}
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