DtLargeImageReader Class Reference

Inheritance diagram for DtLargeImageReader:

Public Types
enum	DtLargeImageFlags { DtKeepSize = 1, DtAutoFitLargeImage = 2 }

Public Member Functions
	DtLargeImageReader (QIODevice *device, DtLargeImageFlags fl=DtAutoFitLargeImage, int stepSize=2, const QByteArray &format=QByteArray())
	DtLargeImageReader (const QString &fileName, DtLargeImageFlags fl=DtAutoFitLargeImage, int stepSize=2, const QByteArray &format=QByteArray())
	~DtLargeImageReader ()
void	setImageSize (const QSize &)
const QSize &	imageSize () const
void	setStepSize (int)
int	stepSize () const
virtual QImage	read ()
	If useThread is true, then puts image read into a thread.
virtual QSize	imageSizeToUse (const QSize &expectedSize) const
	Calculates the size to create of our smaller image based on supplied size.
virtual QSize	minimumImageSize (const QSize &basedOn, int stepSize=2) const
	Give the image size, return a size that can be used to load the image and fit it into memory.
virtual QImage	loadImage (const QSize &imageSize)
	Loads the image into the specified image size.
virtual QSize	determineSize () const
	Given a particular extension, try and use native format calls to get the image size.
virtual QSize	size () const
	If QImageHandler size() does not return a valid size, try some internal routines.
virtual bool	supportsOption (QImageIOHandler::ImageOption option) const
	Override to implement ClipRect for Jpeg.
virtual QRect	clipRect () const
virtual void	setClipRect (const QRect &)
virtual bool	isJpeg () const
virtual QImage	loadClippedImage (const QRect &clipRect, const QSize &outputSize)
	Currently only jpeg clip loading is supported through this extended method.
virtual bool	canImportImage () const
	Returns true if the image can be clipped or scaled.

Static Public Member Functions
static bool	canCreateImageOfSize (const QSize &, int imageDepth=32)

Protected Member Functions
virtual QImage	loadClippedJpeg (const QRect &clipRect, const QSize &outputSize)

Protected Attributes
DtLargeImageFlags	myFlags
QSize	myImageSize
QRect	myClipRect
int	myStepSize
int	myImageDepth
jpegClippedReader *	myScaler

Member Enumeration Documentation

enum DtLargeImageReader::DtLargeImageFlags

Enumerator:

DtKeepSize
DtAutoFitLargeImage

Constructor & Destructor Documentation

DtLargeImageReader::DtLargeImageReader	(	QIODevice *	device,
		DtLargeImageFlags	fl = DtAutoFitLargeImage,
		int	stepSize = 2,
		const QByteArray &	format = QByteArray()
	)

DtLargeImageReader::DtLargeImageReader	(	const QString &	fileName,
		DtLargeImageFlags	fl = DtAutoFitLargeImage,
		int	stepSize = 2,
		const QByteArray &	format = QByteArray()
	)

DtLargeImageReader::~DtLargeImageReader

(

)

Member Function Documentation

static bool DtLargeImageReader::canCreateImageOfSize ( const QSize &  , int  imageDepth = 32  )

static

void DtLargeImageReader::setImageSize ( const QSize &  sz )

inline

References myImageSize.

const QSize & DtLargeImageReader::imageSize ( ) const

inline

References myImageSize.

void DtLargeImageReader::setStepSize ( int  i )

inline

References myStepSize.

int DtLargeImageReader::stepSize ( ) const

inline

References myStepSize.

virtual QImage DtLargeImageReader::read ( )

virtual

If useThread is true, then puts image read into a thread.

Will emit a signal when load is complete

virtual QSize DtLargeImageReader::imageSizeToUse ( const QSize &  expectedSize ) const

virtual

Calculates the size to create of our smaller image based on supplied size.

If supplied size is NULL, calls minimumImageSize(size()) to calculate the minimum size needed to load image. This call might return a different size than expectedSize if the size() of the image does not divide into expectedSize

virtual QSize DtLargeImageReader::minimumImageSize ( const QSize &  basedOn, int  stepSize = 2  ) const

virtual

Give the image size, return a size that can be used to load the image and fit it into memory.

The supplied step size will determine how the width/height is divided at each iteration to find the correct size

virtual QImage DtLargeImageReader::loadImage ( const QSize &  imageSize )

virtual

Loads the image into the specified image size.

Can still return a NULL image if the specified image size is too large

virtual QSize DtLargeImageReader::determineSize ( ) const

virtual

Given a particular extension, try and use native format calls to get the image size.

This can be used if size() is not supported (or returns an invalid value) for a particular image

virtual QSize DtLargeImageReader::size ( ) const

virtual

If QImageHandler size() does not return a valid size, try some internal routines.

virtual bool DtLargeImageReader::supportsOption ( QImageIOHandler::ImageOption  option ) const

virtual

Override to implement ClipRect for Jpeg.

virtual QRect DtLargeImageReader::clipRect ( ) const

virtual

virtual void DtLargeImageReader::setClipRect ( const QRect &  )

virtual

virtual bool DtLargeImageReader::isJpeg ( ) const

virtual

virtual QImage DtLargeImageReader::loadClippedImage ( const QRect &  clipRect, const QSize &  outputSize  )

virtual

Currently only jpeg clip loading is supported through this extended method.

GeoTiff uses the geotiff loader to load clipped images

virtual bool DtLargeImageReader::canImportImage ( ) const

virtual

Returns true if the image can be clipped or scaled.

virtual QImage DtLargeImageReader::loadClippedJpeg ( const QRect &  clipRect, const QSize &  outputSize  )

protectedvirtual

Member Data Documentation

DtLargeImageFlags DtLargeImageReader::myFlags

protected

QSize DtLargeImageReader::myImageSize

protected

Referenced by imageSize(), and setImageSize().

QRect DtLargeImageReader::myClipRect

protected

int DtLargeImageReader::myStepSize

protected

Referenced by setStepSize(), and stepSize().

int DtLargeImageReader::myImageDepth

protected

jpegClippedReader* DtLargeImageReader::myScaler

protected

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The documentation for this class was generated from the following file:

• /exports/nfedora7-1/nightly/docs/vrforcesDevelopment.tot/include/drawerqt/largeImageReader.h