DtLargeImageReader Class Reference

Inheritance diagram for DtLargeImageReader:

List of all members.

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

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Member Enumeration Documentation

enum DtLargeImageReader::DtLargeImageFlags

Enumerator:

DtKeepSize
DtAutoFitLargeImage

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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

(

)

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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
	)		[protected, virtual]

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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:

• include/drawerqt/largeImageReader.h