/**************************************************************************** ** ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the Qt Graphical Effects module. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file under the terms of the BSD license as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names ** of its contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ import QtQuick 2.0 import "private" /*! \qmltype MaskedBlur \inqmlmodule QtGraphicalEffects 1.0 \since QtGraphicalEffects 1.0 \inherits QtQuick2::Item \ingroup qtgraphicaleffects-blur \brief Applies a blur effect with a varying intesity. MaskedBlur effect softens the image by blurring it. The intensity of the blur can be controlled for each pixel using maskSource so that some parts of the source are blurred more than others. By default the effect produces a high quality result, thus the rendering speed may not be the highest possible. The rendering speed is reduced especially if the \l{MaskedBlur::samples}{samples} is large. For use cases that require faster rendering speed and the highest possible visual quality is not necessary, property \l{MaskedBlur::fast}{fast} can be set to true. \table \header \li Source \li MaskSource \li Effect applied \row \li \image Original_bug.png \li \image MaskedBlur_mask.png \li \image MaskedBlur_bug.png \endtable \section1 Example The following example shows how to apply the effect. \snippet MaskedBlur-example.qml example */ Item { id: rootItem /*! 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 item that is controlling the final intensity of the blur. The pixel alpha channel value from maskSource defines the actual blur radius that is going to be used for blurring the corresponding source pixel. Opaque maskSource pixels produce blur with specified \l{MaskedBlur::radius}{radius}, while transparent pixels suppress the blur completely. Semitransparent maskSource pixels produce blur with a radius that is interpolated according to the pixel transparency level. */ property variant maskSource /*! This property defines the distance of the neighboring pixels which affect the blurring of an individual pixel. A larger radius increases the blur effect. Depending on the radius value, value of the \l{MaskedBlur::samples}{samples} should be set to sufficiently large to ensure the visual quality. The value ranges from 0.0 (no blur) to inf. By default, the property is set to \c 0.0 (no blur). \table \header \li Output examples with different radius values \li \li \row \li \image MaskedBlur_radius1.png \li \image MaskedBlur_radius2.png \li \image MaskedBlur_radius3.png \row \li \b { radius: 0 } \li \b { radius: 8 } \li \b { radius: 16 } \row \li \l samples: 24 \li \l samples: 24 \li \l samples: 24 \row \li \l transparentBorder: false \li \l transparentBorder: false \li \l transparentBorder: false \row \li \l fast: false \li \l fast: false \li \l fast: false \endtable */ property real radius: 0.0 /*! 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, for example, if the radius is animated between 0.0 and 4.0, samples should be set to 8. The value ranges from 0 to 32. By default, the property is set to \c 0. This property is not intended to be animated. Changing this property may cause the underlying OpenGL shaders to be recompiled. When \l{MaskedBlur::fast}{fast} property is set to true, this property has no effect. */ property int samples: 0 /*! 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 /*! This property selects the blurring algorithm that is used to produce the blur. Setting this to true enables fast algorithm, setting value to false produces higher quality result. By default, the property is set to \c false. \table \header \li Output examples with different fast values \li \li \row \li \image MaskedBlur_fast1.png \li \image MaskedBlur_fast2.png \row \li \b { fast: false } \li \b { fast: true } \row \li \l radius: 16 \li \l radius: 16 \row \li \l samples: 24 \li \l samples: 24 \row \li \l transparentBorder: false \li \l transparentBorder: false \endtable */ property bool fast: false /*! 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 MaskedBlur_transparentBorder1.png \li \image MaskedBlur_transparentBorder2.png \row \li \b { transparentBorder: false } \li \b { transparentBorder: true } \row \li \l radius: 64 \li \l radius: 64 \row \li \l samples: 24 \li \l samples: 24 \row \li \l fast: true \li \l fast: true \endtable */ property bool transparentBorder: false Loader { id: loaderItem anchors.fill: parent sourceComponent: rootItem.fast ? fastBlur : gaussianBlur } Component { id: gaussianBlur GaussianMaskedBlur { anchors.fill: parent source: rootItem.source maskSource: rootItem.maskSource radius: rootItem.radius maximumRadius: rootItem.samples * 0.5 transparentBorder: rootItem.transparentBorder cached: rootItem.cached } } Component { id: fastBlur FastMaskedBlur { anchors.fill: parent source:rootItem. source maskSource: rootItem.maskSource blur: Math.pow(rootItem.radius / 64.0, 0.4) transparentBorder: rootItem.transparentBorder cached: rootItem.cached } } }