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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the documentation of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:FDL$
** GNU Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms
** and conditions contained in a signed written agreement between you
** and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\qmlclass ZoomBlur
\inqmlmodule QtGraphicalEffects 1.0
\since QtGraphicalEffects 1.0
\inherits QtQuick2::Item
\ingroup qtgraphicaleffects-motion-blur
\brief Applies directional blur effect towards source items center point.
Effect creates perceived impression that the source item appears to be
moving towards the center point in Z-direction or that the camera appears
to be zooming rapidly. Other available motion blur effects are
\l{QtGraphicalEffects1::DirectionalBlur}{DirectionalBlur}
and \l{QtGraphicalEffects1::RadialBlur}{RadialBlur}.
\table
\header
\li Source
\li Effect applied
\row
\li \image Original_bug.png
\li \image ZoomBlur_bug.png
\endtable
\section1 Example
The following example shows how to apply the effect.
\snippet snippets/ZoomBlur-example.qml example
*/
/*!
\qmlproperty variant QtGraphicalEffects1::ZoomBlur::source
This property defines the source item that is going to be blurred.
*/
/*!
\qmlproperty real QtGraphicalEffects1::ZoomBlur::length
This property defines the maximum perceived amount of movement for each
pixel. The amount is smaller near the center and reaches the specified
value at the edges.
The quality of the blur depends on \l{ZoomBlur::samples}{samples} property. If length value is
large, more samples are needed to keep the visual quality at high level.
The value ranges from 0.0 to inf.
By default the property is set to \c 0.0 (no blur).
\table
\header
\li Output examples with different length values
\li
\li
\row
\li \image ZoomBlur_length1.png
\li \image ZoomBlur_length2.png
\li \image ZoomBlur_length3.png
\row
\li \b { length: 0.0 }
\li \b { length: 32.0 }
\li \b { length: 48.0 }
\row
\li \l samples: 24
\li \l samples: 24
\li \l samples: 24
\row
\li \l horizontalOffset: 0
\li \l horizontalOffset: 0
\li \l horizontalOffset: 0
\row
\li \l verticalOffset: 0
\li \l verticalOffset: 0
\li \l verticalOffset: 0
\endtable
*/
/*!
\qmlproperty int QtGraphicalEffects1::ZoomBlur::samples
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.
This property is not intended to be animated. Changing this property may
cause the underlying OpenGL shaders to be recompiled.
Allowed values are between 0 and inf (practical maximum depends on GPU).
By default the property is set to \c 0 (no samples).
*/
/*!
\qmlproperty real QtGraphicalEffects1::ZoomBlur::horizontalOffset
\qmlproperty real QtGraphicalEffects1::ZoomBlur::verticalOffset
These properties define an offset in pixels for the blur direction center
point.
The values range from -inf to inf. By default these properties are set
to \c 0.
\table
\header
\li Output examples with different horizontalOffset values
\li
\li
\row
\li \image ZoomBlur_horizontalOffset1.png
\li \image ZoomBlur_horizontalOffset2.png
\li \image ZoomBlur_horizontalOffset3.png
\row
\li \b { horizontalOffset: 100.0 }
\li \b { horizontalOffset: 0.0 }
\li \b { horizontalOffset: -100.0 }
\row
\li \l samples: 24
\li \l samples: 24
\li \l samples: 24
\row
\li \l length: 32
\li \l length: 32
\li \l length: 32
\row
\li \l verticalOffset: 0
\li \l verticalOffset: 0
\li \l verticalOffset: 0
\endtable
*/
/*!
\qmlproperty bool QtGraphicalEffects1::ZoomBlur::transparentBorder
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.
*/
/*!
\qmlproperty bool QtGraphicalEffects1::ZoomBlur::cached
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.
*/
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