Mac-4.7.4/src/declarative/graphicsitems/qdeclarativeimage.cpp - platform/external/qt - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the QtDeclarative module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser General Public
 ** License version 2.1 as published by the Free Software Foundation and
 ** appearing in the file LICENSE.LGPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU Lesser
 ** General Public License version 2.1 requirements will be met:
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
 ** 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.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "private/qdeclarativeimage_p.h"
 #include "private/qdeclarativeimage_p_p.h"

 #include <QKeyEvent>
 #include <QPainter>

 QT_BEGIN_NAMESPACE


 /*!
     \qmlclass Image QDeclarativeImage
     \since 4.7
     \ingroup qml-basic-visual-elements
     \brief The Image element displays an image in a declarative user interface
     \inherits Item

     The Image element is used to display images in a declarative user interface.

     The source of the image is specified as a URL using the \l source property.
     Images can be supplied in any of the standard image formats supported by Qt,
     including bitmap formats such as PNG and JPEG, and vector graphics formats
     such as SVG. If you need to display animated images, use the \l AnimatedImage
     element.

     If the \l{Item::width}{width} and \l{Item::height}{height} properties are not
     specified, the Image element automatically uses the size of the loaded image.
     By default, specifying the width and height of the element causes the image
     to be scaled to that size. This behavior can be changed by setting the
     \l fillMode property, allowing the image to be stretched and tiled instead.

     \section1 Example Usage

     The following example shows the simplest usage of the Image element.

     \snippet doc/src/snippets/declarative/image.qml document

     \beginfloatleft
     \image declarative-qtlogo.png
     \endfloat

     \clearfloat

     \section1 Performance

     By default, locally available images are loaded immediately, and the user interface
     is blocked until loading is complete. If a large image is to be loaded, it may be
     preferable to load the image in a low priority thread, by enabling the \l asynchronous
     property.

     If the image is obtained from a network rather than a local resource, it is
     automatically loaded asynchronously, and the \l progress and \l status properties
     are updated as appropriate.

     Images are cached and shared internally, so if several Image elements have the same \l source,
     only one copy of the image will be loaded.

     \bold Note: Images are often the greatest user of memory in QML user interfaces.  It is recommended
     that images which do not form part of the user interface have their
     size bounded via the \l sourceSize property. This is especially important for content
     that is loaded from external sources or provided by the user.

     \sa {declarative/imageelements/image}{Image example}, QDeclarativeImageProvider
 */

 QDeclarativeImage::QDeclarativeImage(QDeclarativeItem *parent)
     : QDeclarativeImageBase(*(new QDeclarativeImagePrivate), parent)
 {
 }

 QDeclarativeImage::QDeclarativeImage(QDeclarativeImagePrivate &dd, QDeclarativeItem *parent)
     : QDeclarativeImageBase(dd, parent)
 {
 }

 QDeclarativeImage::~QDeclarativeImage()
 {
 }

 QPixmap QDeclarativeImage::pixmap() const
 {
     Q_D(const QDeclarativeImage);
     return d->pix.pixmap();
 }

 void QDeclarativeImage::setPixmap(const QPixmap &pix)
 {
     Q_D(QDeclarativeImage);
     if (!d->url.isEmpty())
         return;
     d->setPixmap(pix);
 }

 void QDeclarativeImagePrivate::setPixmap(const QPixmap &pixmap)
 {
     Q_Q(QDeclarativeImage);
     pix.setPixmap(pixmap);

     q->pixmapChange();
     status = pix.isNull() ? QDeclarativeImageBase::Null : QDeclarativeImageBase::Ready;

     q->update();
 }

 /*!
     \qmlproperty enumeration Image::fillMode

     Set this property to define what happens when the source image has a different size
     than the item.

     \list
     \o Image.Stretch - the image is scaled to fit
     \o Image.PreserveAspectFit - the image is scaled uniformly to fit without cropping
     \o Image.PreserveAspectCrop - the image is scaled uniformly to fill, cropping if necessary
     \o Image.Tile - the image is duplicated horizontally and vertically
     \o Image.TileVertically - the image is stretched horizontally and tiled vertically
     \o Image.TileHorizontally - the image is stretched vertically and tiled horizontally
     \endlist

     \table

     \row
     \o \image declarative-qtlogo-stretch.png
     \o Stretch (default)
     \qml
     Image {
         width: 130; height: 100
         smooth: true
         source: "qtlogo.png"
     }
     \endqml

     \row
     \o \image declarative-qtlogo-preserveaspectfit.png
     \o PreserveAspectFit
     \qml
     Image {
         width: 130; height: 100
         fillMode: Image.PreserveAspectFit
         smooth: true
         source: "qtlogo.png"
     }
     \endqml

     \row
     \o \image declarative-qtlogo-preserveaspectcrop.png
     \o PreserveAspectCrop
     \qml
     Image {
         width: 130; height: 100
         fillMode: Image.PreserveAspectCrop
         smooth: true
         source: "qtlogo.png"
         clip: true
     }
     \endqml

     \row
     \o \image declarative-qtlogo-tile.png
     \o Tile
     \qml
     Image {
         width: 120; height: 120
         fillMode: Image.Tile
         source: "qtlogo.png"
     }
     \endqml

     \row
     \o \image declarative-qtlogo-tilevertically.png
     \o TileVertically
     \qml
     Image {
         width: 120; height: 120
         fillMode: Image.TileVertically
         smooth: true
         source: "qtlogo.png"
     }
     \endqml

     \row
     \o \image declarative-qtlogo-tilehorizontally.png
     \o TileHorizontally
     \qml
     Image {
         width: 120; height: 120
         fillMode: Image.TileHorizontally
         smooth: true
         source: "qtlogo.png"
     }
     \endqml

     \endtable

     Note that \c clip is \c false by default which means that the element might
     paint outside its bounding rectangle even if the fillMode is set to \c PreserveAspectCrop.

     \sa {declarative/imageelements/image}{Image example}
 */
 QDeclarativeImage::FillMode QDeclarativeImage::fillMode() const
 {
     Q_D(const QDeclarativeImage);
     return d->fillMode;
 }

 void QDeclarativeImage::setFillMode(FillMode mode)
 {
     Q_D(QDeclarativeImage);
     if (d->fillMode == mode)
         return;
     d->fillMode = mode;
     update();
     updatePaintedGeometry();
     emit fillModeChanged();
 }

 /*!

     \qmlproperty real Image::paintedWidth
     \qmlproperty real Image::paintedHeight

     These properties hold the size of the image that is actually painted.
     In most cases it is the same as \c width and \c height, but when using a
     \c fillMode \c PreserveAspectFit or \c fillMode \c PreserveAspectCrop
     \c paintedWidth or \c paintedHeight can be smaller or larger than
     \c width and \c height of the Image element.
 */
 qreal QDeclarativeImage::paintedWidth() const
 {
     Q_D(const QDeclarativeImage);
     return d->paintedWidth;
 }

 qreal QDeclarativeImage::paintedHeight() const
 {
     Q_D(const QDeclarativeImage);
     return d->paintedHeight;
 }

 /*!
     \qmlproperty enumeration Image::status

     This property holds the status of image loading.  It can be one of:
     \list
     \o Image.Null - no image has been set
     \o Image.Ready - the image has been loaded
     \o Image.Loading - the image is currently being loaded
     \o Image.Error - an error occurred while loading the image
     \endlist

     Use this status to provide an update or respond to the status change in some way.
     For example, you could:

     \list
     \o Trigger a state change:
     \qml
         State { name: 'loaded'; when: image.status == Image.Ready }
     \endqml

     \o Implement an \c onStatusChanged signal handler:
     \qml
         Image {
             id: image
             onStatusChanged: if (image.status == Image.Ready) console.log('Loaded')
         }
     \endqml

     \o Bind to the status value:
     \qml
         Text { text: image.status == Image.Ready ? 'Loaded' : 'Not loaded' }
     \endqml
     \endlist

     \sa progress
 */

 /*!
     \qmlproperty real Image::progress

     This property holds the progress of image loading, from 0.0 (nothing loaded)
     to 1.0 (finished).

     \sa status
 */

 /*!
     \qmlproperty bool Image::smooth

     Set this property if you want the image to be smoothly filtered when scaled or
     transformed.  Smooth filtering gives better visual quality, but is slower.  If
     the image is displayed at its natural size, this property has no visual or
     performance effect.

     \note Generally scaling artifacts are only visible if the image is stationary on
     the screen.  A common pattern when animating an image is to disable smooth
     filtering at the beginning of the animation and reenable it at the conclusion.
 */

 /*!
     \qmlproperty QSize Image::sourceSize

     This property holds the actual width and height of the loaded image.

     Unlike the \l {Item::}{width} and \l {Item::}{height} properties, which scale
     the painting of the image, this property sets the actual number of pixels
     stored for the loaded image so that large images do not use more
     memory than necessary. For example, this ensures the image in memory is no
     larger than 1024x1024 pixels, regardless of the Image's \l {Item::}{width} and
     \l {Item::}{height} values:

     \code
     Rectangle {
         width: ...
         height: ...

         Image {
            anchors.fill: parent
            source: "reallyBigImage.jpg"
            sourceSize.width: 1024
            sourceSize.height: 1024
         }
     }
     \endcode

     If the image's actual size is larger than the sourceSize, the image is scaled down.
     If only one dimension of the size is set to greater than 0, the
     other dimension is set in proportion to preserve the source image's aspect ratio.
     (The \l fillMode is independent of this.)

     If the source is an instrinsically scalable image (eg. SVG), this property
     determines the size of the loaded image regardless of intrinsic size.
     Avoid changing this property dynamically; rendering an SVG is \e slow compared
     to an image.

     If the source is a non-scalable image (eg. JPEG), the loaded image will
     be no greater than this property specifies. For some formats (currently only JPEG),
     the whole image will never actually be loaded into memory.

     Since QtQuick 1.1 the sourceSize can be cleared to the natural size of the image
     by setting sourceSize to \c undefined.

     \note \e {Changing this property dynamically causes the image source to be reloaded,
     potentially even from the network, if it is not in the disk cache.}
 */

 void QDeclarativeImage::updatePaintedGeometry()
 {
     Q_D(QDeclarativeImage);

     if (d->fillMode == PreserveAspectFit) {
         if (!d->pix.width() || !d->pix.height()) {
             setImplicitWidth(0);
             setImplicitHeight(0);
             return;
         }
         qreal w = widthValid() ? width() : d->pix.width();
         qreal widthScale = w / qreal(d->pix.width());
         qreal h = heightValid() ? height() : d->pix.height();
         qreal heightScale = h / qreal(d->pix.height());
         if (widthScale <= heightScale) {
             d->paintedWidth = w;
             d->paintedHeight = widthScale * qreal(d->pix.height());
         } else if(heightScale < widthScale) {
             d->paintedWidth = heightScale * qreal(d->pix.width());
             d->paintedHeight = h;
         }
         if (widthValid() && !heightValid()) {
             setImplicitHeight(d->paintedHeight);
         } else {
             setImplicitHeight(d->pix.height());
         }
         if (heightValid() && !widthValid()) {
             setImplicitWidth(d->paintedWidth);
         } else {
             setImplicitWidth(d->pix.width());
         }
     } else if (d->fillMode == PreserveAspectCrop) {
         if (!d->pix.width() || !d->pix.height())
             return;
         qreal widthScale = width() / qreal(d->pix.width());
         qreal heightScale = height() / qreal(d->pix.height());
         if (widthScale < heightScale) {
             widthScale = heightScale;
         } else if(heightScale < widthScale) {
             heightScale = widthScale;
         }

         d->paintedHeight = heightScale * qreal(d->pix.height());
         d->paintedWidth = widthScale * qreal(d->pix.width());
     } else {
         d->paintedWidth = width();
         d->paintedHeight = height();
     }
     emit paintedGeometryChanged();
 }

 void QDeclarativeImage::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
 {
     QDeclarativeImageBase::geometryChanged(newGeometry, oldGeometry);
     updatePaintedGeometry();
 }

 QRectF QDeclarativeImage::boundingRect() const
 {
     Q_D(const QDeclarativeImage);
     return QRectF(0, 0, qMax(d->mWidth, d->paintedWidth), qMax(d->mHeight, d->paintedHeight));
 }

 /*!
     \qmlproperty url Image::source

     Image can handle any image format supported by Qt, loaded from any URL scheme supported by Qt.

     The URL may be absolute, or relative to the URL of the component.

     \sa QDeclarativeImageProvider
 */

 /*!
     \qmlproperty bool Image::asynchronous

     Specifies that images on the local filesystem should be loaded
     asynchronously in a separate thread.  The default value is
     false, causing the user interface thread to block while the
     image is loaded.  Setting \a asynchronous to true is useful where
     maintaining a responsive user interface is more desirable
     than having images immediately visible.

     Note that this property is only valid for images read from the
     local filesystem.  Images loaded via a network resource (e.g. HTTP)
     are always loaded asynchonously.
 */

 /*!
     \qmlproperty bool Image::cache
     \since QtQuick 1.1

     Specifies whether the image should be cached. The default value is
     true. Setting \a cache to false is useful when dealing with large images,
     to make sure that they aren't cached at the expense of small 'ui element' images.
 */

 /*!
     \qmlproperty bool Image::mirror
     \since QtQuick 1.1

     This property holds whether the image should be horizontally inverted
     (effectively displaying a mirrored image).

     The default value is false.
 */


 void QDeclarativeImage::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *)
 {
     Q_D(QDeclarativeImage);
     if (d->pix.pixmap().isNull() )
         return;

     int drawWidth = width();
     int drawHeight = height();
     bool doClip = false;
     QTransform transform;
     qreal widthScale = width() / qreal(d->pix.width());
     qreal heightScale = height() / qreal(d->pix.height());

     if (width() != d->pix.width() || height() != d->pix.height()) {
         if (d->fillMode >= Tile) {
             if (d->fillMode == TileVertically) {
                 transform.scale(widthScale, 1.0);
                 drawWidth = d->pix.width();
             } else if (d->fillMode == TileHorizontally) {
                 transform.scale(1.0, heightScale);
                 drawHeight = d->pix.height();
             }
         } else {
             if (d->fillMode == PreserveAspectFit) {
                 if (widthScale <= heightScale) {
                     heightScale = widthScale;
                     transform.translate(0, (height() - heightScale * d->pix.height()) / 2);
                 } else if(heightScale < widthScale) {
                     widthScale = heightScale;
                     transform.translate((width() - widthScale * d->pix.width()) / 2, 0);
                 }
             } else if (d->fillMode == PreserveAspectCrop) {
                 if (widthScale < heightScale) {
                     widthScale = heightScale;
                     transform.translate((width() - widthScale * d->pix.width()) / 2, 0);
                 } else if(heightScale < widthScale) {
                     heightScale = widthScale;
                     transform.translate(0, (height() - heightScale * d->pix.height()) / 2);
                 }
             }
             transform.scale(widthScale, heightScale);
             drawWidth = d->pix.width();
             drawHeight = d->pix.height();
             doClip = clip();
         }
     }

     QTransform oldTransform;
     bool oldAA = p->testRenderHint(QPainter::Antialiasing);
     bool oldSmooth = p->testRenderHint(QPainter::SmoothPixmapTransform);
     if (d->smooth)
         p->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, d->smooth);
     if (doClip) {
         p->save();
         p->setClipRect(QRectF(0, 0, d->mWidth, d->mHeight), Qt::IntersectClip);
     }
     if (d->mirror)
         transform.translate(drawWidth, 0).scale(-1.0, 1.0);
     if (!transform.isIdentity()) {
         oldTransform = p->transform();
         p->setWorldTransform(transform * oldTransform);
     }

     if (d->fillMode >= Tile)
         p->drawTiledPixmap(QRectF(0, 0, drawWidth, drawHeight), d->pix);
     else
         p->drawPixmap(QRectF(0, 0, drawWidth, drawHeight), d->pix, QRectF(0, 0, drawWidth, drawHeight));

     if (d->smooth) {
         p->setRenderHint(QPainter::Antialiasing, oldAA);
         p->setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth);
     }
     if (doClip)
         p->restore();
     if (!transform.isIdentity())
         p->setWorldTransform(oldTransform);
 }

 void QDeclarativeImage::pixmapChange()
 {
     Q_D(QDeclarativeImage);
     // PreserveAspectFit calculates the implicit size differently so we
     // don't call our superclass pixmapChange(), since that would
     // result in the implicit size being set incorrectly, then updated
     // in updatePaintedGeometry()
     if (d->fillMode != PreserveAspectFit)
         QDeclarativeImageBase::pixmapChange();
     updatePaintedGeometry();
 }

 QT_END_NAMESPACE
	/****************************************************************************
	**
	** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
	** All rights reserved.
	** Contact: Nokia Corporation (qt-info@nokia.com)
	**
	** This file is part of the QtDeclarative module of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** GNU Lesser General Public License Usage
	** This file may be used under the terms of the GNU Lesser General Public
	** License version 2.1 as published by the Free Software Foundation and
	** appearing in the file LICENSE.LGPL included in the packaging of this
	** file. Please review the following information to ensure the GNU Lesser
	** General Public License version 2.1 requirements will be met:
	** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
	**
	** In addition, as a special exception, Nokia gives you certain additional
	** rights. These rights are described in the Nokia Qt LGPL Exception
	** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU General
	** Public License version 3.0 as published by the Free Software Foundation
	** and appearing in the file LICENSE.GPL included in the packaging of this
	** file. Please review the following information to ensure the GNU General
	** Public License version 3.0 requirements will be met:
	** http://www.gnu.org/copyleft/gpl.html.
	**
	** 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.
	**
	**
	**
	**
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "private/qdeclarativeimage_p.h"
	#include "private/qdeclarativeimage_p_p.h"

	#include <QKeyEvent>
	#include <QPainter>

	QT_BEGIN_NAMESPACE


	/*!
	\qmlclass Image QDeclarativeImage
	\since 4.7
	\ingroup qml-basic-visual-elements
	\brief The Image element displays an image in a declarative user interface
	\inherits Item

	The Image element is used to display images in a declarative user interface.

	The source of the image is specified as a URL using the \l source property.
	Images can be supplied in any of the standard image formats supported by Qt,
	including bitmap formats such as PNG and JPEG, and vector graphics formats
	such as SVG. If you need to display animated images, use the \l AnimatedImage
	element.

	If the \l{Item::width}{width} and \l{Item::height}{height} properties are not
	specified, the Image element automatically uses the size of the loaded image.
	By default, specifying the width and height of the element causes the image
	to be scaled to that size. This behavior can be changed by setting the
	\l fillMode property, allowing the image to be stretched and tiled instead.

	\section1 Example Usage

	The following example shows the simplest usage of the Image element.

	\snippet doc/src/snippets/declarative/image.qml document

	\beginfloatleft
	\image declarative-qtlogo.png
	\endfloat

	\clearfloat

	\section1 Performance

	By default, locally available images are loaded immediately, and the user interface
	is blocked until loading is complete. If a large image is to be loaded, it may be
	preferable to load the image in a low priority thread, by enabling the \l asynchronous
	property.

	If the image is obtained from a network rather than a local resource, it is
	automatically loaded asynchronously, and the \l progress and \l status properties
	are updated as appropriate.

	Images are cached and shared internally, so if several Image elements have the same \l source,
	only one copy of the image will be loaded.

	\bold Note: Images are often the greatest user of memory in QML user interfaces. It is recommended
	that images which do not form part of the user interface have their
	size bounded via the \l sourceSize property. This is especially important for content
	that is loaded from external sources or provided by the user.

	\sa {declarative/imageelements/image}{Image example}, QDeclarativeImageProvider
	*/

	QDeclarativeImage::QDeclarativeImage(QDeclarativeItem *parent)
	: QDeclarativeImageBase(*(new QDeclarativeImagePrivate), parent)
	{
	}

	QDeclarativeImage::QDeclarativeImage(QDeclarativeImagePrivate &dd, QDeclarativeItem *parent)
	: QDeclarativeImageBase(dd, parent)
	{
	}

	QDeclarativeImage::~QDeclarativeImage()
	{
	}

	QPixmap QDeclarativeImage::pixmap() const
	{
	Q_D(const QDeclarativeImage);
	return d->pix.pixmap();
	}

	void QDeclarativeImage::setPixmap(const QPixmap &pix)
	{
	Q_D(QDeclarativeImage);
	if (!d->url.isEmpty())
	return;
	d->setPixmap(pix);
	}

	void QDeclarativeImagePrivate::setPixmap(const QPixmap &pixmap)
	{
	Q_Q(QDeclarativeImage);
	pix.setPixmap(pixmap);

	q->pixmapChange();
	status = pix.isNull() ? QDeclarativeImageBase::Null : QDeclarativeImageBase::Ready;

	q->update();
	}

	/*!
	\qmlproperty enumeration Image::fillMode

	Set this property to define what happens when the source image has a different size
	than the item.

	\list
	\o Image.Stretch - the image is scaled to fit
	\o Image.PreserveAspectFit - the image is scaled uniformly to fit without cropping
	\o Image.PreserveAspectCrop - the image is scaled uniformly to fill, cropping if necessary
	\o Image.Tile - the image is duplicated horizontally and vertically
	\o Image.TileVertically - the image is stretched horizontally and tiled vertically
	\o Image.TileHorizontally - the image is stretched vertically and tiled horizontally
	\endlist

	\table

	\row
	\o \image declarative-qtlogo-stretch.png
	\o Stretch (default)
	\qml
	Image {
	width: 130; height: 100
	smooth: true
	source: "qtlogo.png"
	}
	\endqml

	\row
	\o \image declarative-qtlogo-preserveaspectfit.png
	\o PreserveAspectFit
	\qml
	Image {
	width: 130; height: 100
	fillMode: Image.PreserveAspectFit
	smooth: true
	source: "qtlogo.png"
	}
	\endqml

	\row
	\o \image declarative-qtlogo-preserveaspectcrop.png
	\o PreserveAspectCrop
	\qml
	Image {
	width: 130; height: 100
	fillMode: Image.PreserveAspectCrop
	smooth: true
	source: "qtlogo.png"
	clip: true
	}
	\endqml

	\row
	\o \image declarative-qtlogo-tile.png
	\o Tile
	\qml
	Image {
	width: 120; height: 120
	fillMode: Image.Tile
	source: "qtlogo.png"
	}
	\endqml

	\row
	\o \image declarative-qtlogo-tilevertically.png
	\o TileVertically
	\qml
	Image {
	width: 120; height: 120
	fillMode: Image.TileVertically
	smooth: true
	source: "qtlogo.png"
	}
	\endqml

	\row
	\o \image declarative-qtlogo-tilehorizontally.png
	\o TileHorizontally
	\qml
	Image {
	width: 120; height: 120
	fillMode: Image.TileHorizontally
	smooth: true
	source: "qtlogo.png"
	}
	\endqml

	\endtable

	Note that \c clip is \c false by default which means that the element might
	paint outside its bounding rectangle even if the fillMode is set to \c PreserveAspectCrop.

	\sa {declarative/imageelements/image}{Image example}
	*/
	QDeclarativeImage::FillMode QDeclarativeImage::fillMode() const
	{
	Q_D(const QDeclarativeImage);
	return d->fillMode;
	}

	void QDeclarativeImage::setFillMode(FillMode mode)
	{
	Q_D(QDeclarativeImage);
	if (d->fillMode == mode)
	return;
	d->fillMode = mode;
	update();
	updatePaintedGeometry();
	emit fillModeChanged();
	}

	/*!

	\qmlproperty real Image::paintedWidth
	\qmlproperty real Image::paintedHeight

	These properties hold the size of the image that is actually painted.
	In most cases it is the same as \c width and \c height, but when using a
	\c fillMode \c PreserveAspectFit or \c fillMode \c PreserveAspectCrop
	\c paintedWidth or \c paintedHeight can be smaller or larger than
	\c width and \c height of the Image element.
	*/
	qreal QDeclarativeImage::paintedWidth() const
	{
	Q_D(const QDeclarativeImage);
	return d->paintedWidth;
	}

	qreal QDeclarativeImage::paintedHeight() const
	{
	Q_D(const QDeclarativeImage);
	return d->paintedHeight;
	}

	/*!
	\qmlproperty enumeration Image::status

	This property holds the status of image loading. It can be one of:
	\list
	\o Image.Null - no image has been set
	\o Image.Ready - the image has been loaded
	\o Image.Loading - the image is currently being loaded
	\o Image.Error - an error occurred while loading the image
	\endlist

	Use this status to provide an update or respond to the status change in some way.
	For example, you could:

	\list
	\o Trigger a state change:
	\qml
	State { name: 'loaded'; when: image.status == Image.Ready }
	\endqml

	\o Implement an \c onStatusChanged signal handler:
	\qml
	Image {
	id: image
	onStatusChanged: if (image.status == Image.Ready) console.log('Loaded')
	}
	\endqml

	\o Bind to the status value:
	\qml
	Text { text: image.status == Image.Ready ? 'Loaded' : 'Not loaded' }
	\endqml
	\endlist

	\sa progress
	*/

	/*!
	\qmlproperty real Image::progress

	This property holds the progress of image loading, from 0.0 (nothing loaded)
	to 1.0 (finished).

	\sa status
	*/

	/*!
	\qmlproperty bool Image::smooth

	Set this property if you want the image to be smoothly filtered when scaled or
	transformed. Smooth filtering gives better visual quality, but is slower. If
	the image is displayed at its natural size, this property has no visual or
	performance effect.

	\note Generally scaling artifacts are only visible if the image is stationary on
	the screen. A common pattern when animating an image is to disable smooth
	filtering at the beginning of the animation and reenable it at the conclusion.
	*/

	/*!
	\qmlproperty QSize Image::sourceSize

	This property holds the actual width and height of the loaded image.

	Unlike the \l {Item::}{width} and \l {Item::}{height} properties, which scale
	the painting of the image, this property sets the actual number of pixels
	stored for the loaded image so that large images do not use more
	memory than necessary. For example, this ensures the image in memory is no
	larger than 1024x1024 pixels, regardless of the Image's \l {Item::}{width} and
	\l {Item::}{height} values:

	\code
	Rectangle {
	width: ...
	height: ...

	Image {
	anchors.fill: parent
	source: "reallyBigImage.jpg"
	sourceSize.width: 1024
	sourceSize.height: 1024
	}
	}
	\endcode

	If the image's actual size is larger than the sourceSize, the image is scaled down.
	If only one dimension of the size is set to greater than 0, the
	other dimension is set in proportion to preserve the source image's aspect ratio.
	(The \l fillMode is independent of this.)

	If the source is an instrinsically scalable image (eg. SVG), this property
	determines the size of the loaded image regardless of intrinsic size.
	Avoid changing this property dynamically; rendering an SVG is \e slow compared
	to an image.

	If the source is a non-scalable image (eg. JPEG), the loaded image will
	be no greater than this property specifies. For some formats (currently only JPEG),
	the whole image will never actually be loaded into memory.

	Since QtQuick 1.1 the sourceSize can be cleared to the natural size of the image
	by setting sourceSize to \c undefined.

	\note \e {Changing this property dynamically causes the image source to be reloaded,
	potentially even from the network, if it is not in the disk cache.}
	*/

	void QDeclarativeImage::updatePaintedGeometry()
	{
	Q_D(QDeclarativeImage);

	if (d->fillMode == PreserveAspectFit) {
	if (!d->pix.width() \|\| !d->pix.height()) {
	setImplicitWidth(0);
	setImplicitHeight(0);
	return;
	}
	qreal w = widthValid() ? width() : d->pix.width();
	qreal widthScale = w / qreal(d->pix.width());
	qreal h = heightValid() ? height() : d->pix.height();
	qreal heightScale = h / qreal(d->pix.height());
	if (widthScale <= heightScale) {
	d->paintedWidth = w;
	d->paintedHeight = widthScale * qreal(d->pix.height());
	} else if(heightScale < widthScale) {
	d->paintedWidth = heightScale * qreal(d->pix.width());
	d->paintedHeight = h;
	}
	if (widthValid() && !heightValid()) {
	setImplicitHeight(d->paintedHeight);
	} else {
	setImplicitHeight(d->pix.height());
	}
	if (heightValid() && !widthValid()) {
	setImplicitWidth(d->paintedWidth);
	} else {
	setImplicitWidth(d->pix.width());
	}
	} else if (d->fillMode == PreserveAspectCrop) {
	if (!d->pix.width() \|\| !d->pix.height())
	return;
	qreal widthScale = width() / qreal(d->pix.width());
	qreal heightScale = height() / qreal(d->pix.height());
	if (widthScale < heightScale) {
	widthScale = heightScale;
	} else if(heightScale < widthScale) {
	heightScale = widthScale;
	}

	d->paintedHeight = heightScale * qreal(d->pix.height());
	d->paintedWidth = widthScale * qreal(d->pix.width());
	} else {
	d->paintedWidth = width();
	d->paintedHeight = height();
	}
	emit paintedGeometryChanged();
	}

	void QDeclarativeImage::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
	{
	QDeclarativeImageBase::geometryChanged(newGeometry, oldGeometry);
	updatePaintedGeometry();
	}

	QRectF QDeclarativeImage::boundingRect() const
	{
	Q_D(const QDeclarativeImage);
	return QRectF(0, 0, qMax(d->mWidth, d->paintedWidth), qMax(d->mHeight, d->paintedHeight));
	}

	/*!
	\qmlproperty url Image::source

	Image can handle any image format supported by Qt, loaded from any URL scheme supported by Qt.

	The URL may be absolute, or relative to the URL of the component.

	\sa QDeclarativeImageProvider
	*/

	/*!
	\qmlproperty bool Image::asynchronous

	Specifies that images on the local filesystem should be loaded
	asynchronously in a separate thread. The default value is
	false, causing the user interface thread to block while the
	image is loaded. Setting \a asynchronous to true is useful where
	maintaining a responsive user interface is more desirable
	than having images immediately visible.

	Note that this property is only valid for images read from the
	local filesystem. Images loaded via a network resource (e.g. HTTP)
	are always loaded asynchonously.
	*/

	/*!
	\qmlproperty bool Image::cache
	\since QtQuick 1.1

	Specifies whether the image should be cached. The default value is
	true. Setting \a cache to false is useful when dealing with large images,
	to make sure that they aren't cached at the expense of small 'ui element' images.
	*/

	/*!
	\qmlproperty bool Image::mirror
	\since QtQuick 1.1

	This property holds whether the image should be horizontally inverted
	(effectively displaying a mirrored image).

	The default value is false.
	*/


	void QDeclarativeImage::paint(QPainter p, const QStyleOptionGraphicsItem , QWidget *)
	{
	Q_D(QDeclarativeImage);
	if (d->pix.pixmap().isNull() )
	return;

	int drawWidth = width();
	int drawHeight = height();
	bool doClip = false;
	QTransform transform;
	qreal widthScale = width() / qreal(d->pix.width());
	qreal heightScale = height() / qreal(d->pix.height());

	if (width() != d->pix.width() \|\| height() != d->pix.height()) {
	if (d->fillMode >= Tile) {
	if (d->fillMode == TileVertically) {
	transform.scale(widthScale, 1.0);
	drawWidth = d->pix.width();
	} else if (d->fillMode == TileHorizontally) {
	transform.scale(1.0, heightScale);
	drawHeight = d->pix.height();
	}
	} else {
	if (d->fillMode == PreserveAspectFit) {
	if (widthScale <= heightScale) {
	heightScale = widthScale;
	transform.translate(0, (height() - heightScale * d->pix.height()) / 2);
	} else if(heightScale < widthScale) {
	widthScale = heightScale;
	transform.translate((width() - widthScale * d->pix.width()) / 2, 0);
	}
	} else if (d->fillMode == PreserveAspectCrop) {
	if (widthScale < heightScale) {
	widthScale = heightScale;
	transform.translate((width() - widthScale * d->pix.width()) / 2, 0);
	} else if(heightScale < widthScale) {
	heightScale = widthScale;
	transform.translate(0, (height() - heightScale * d->pix.height()) / 2);
	}
	}
	transform.scale(widthScale, heightScale);
	drawWidth = d->pix.width();
	drawHeight = d->pix.height();
	doClip = clip();
	}
	}

	QTransform oldTransform;
	bool oldAA = p->testRenderHint(QPainter::Antialiasing);
	bool oldSmooth = p->testRenderHint(QPainter::SmoothPixmapTransform);
	if (d->smooth)
	p->setRenderHints(QPainter::Antialiasing \| QPainter::SmoothPixmapTransform, d->smooth);
	if (doClip) {
	p->save();
	p->setClipRect(QRectF(0, 0, d->mWidth, d->mHeight), Qt::IntersectClip);
	}
	if (d->mirror)
	transform.translate(drawWidth, 0).scale(-1.0, 1.0);
	if (!transform.isIdentity()) {
	oldTransform = p->transform();
	p->setWorldTransform(transform * oldTransform);
	}

	if (d->fillMode >= Tile)
	p->drawTiledPixmap(QRectF(0, 0, drawWidth, drawHeight), d->pix);
	else
	p->drawPixmap(QRectF(0, 0, drawWidth, drawHeight), d->pix, QRectF(0, 0, drawWidth, drawHeight));

	if (d->smooth) {
	p->setRenderHint(QPainter::Antialiasing, oldAA);
	p->setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth);
	}
	if (doClip)
	p->restore();
	if (!transform.isIdentity())
	p->setWorldTransform(oldTransform);
	}

	void QDeclarativeImage::pixmapChange()
	{
	Q_D(QDeclarativeImage);
	// PreserveAspectFit calculates the implicit size differently so we
	// don't call our superclass pixmapChange(), since that would
	// result in the implicit size being set incorrectly, then updated
	// in updatePaintedGeometry()
	if (d->fillMode != PreserveAspectFit)
	QDeclarativeImageBase::pixmapChange();
	updatePaintedGeometry();
	}

	QT_END_NAMESPACE