#include <qjpeghandler_p.h>

Inheritance diagram for QJpegHandler:

Collaboration diagram for QJpegHandler:

Public Member Functions
	QJpegHandler ()

	~QJpegHandler ()

bool	canRead () const override
	Returns `true` if an image can be read from the device (i.e., the image format is supported, the device can be read from and the initial header information suggests that the image can be read); otherwise returns `false`.

bool	read (QImage *image) override
	Read an image from the device, and stores it in image.

bool	write (const QImage &image) override
	Writes the image image to the assigned device.

QVariant	option (ImageOption option) const override
	Returns the value assigned to option as a QVariant.

void	setOption (ImageOption option, const QVariant &value) override
	Sets the option option with the value value.

bool	supportsOption (ImageOption option) const override
	Returns `true` if the QImageIOHandler supports the option option; otherwise returns `false`.

Public Member Functions inherited from QImageIOHandler
	QImageIOHandler ()
	Constructs a QImageIOHandler object.

virtual	~QImageIOHandler ()
	Destructs the QImageIOHandler object.

void	setDevice (QIODevice *device)
	Sets the device of the QImageIOHandler to device.

QIODevice *	device () const
	Returns the device currently assigned to the QImageIOHandler.

void	setFormat (const QByteArray &format)
	Sets the format of the QImageIOHandler to format.

void	setFormat (const QByteArray &format) const
	Sets the format of the QImageIOHandler to format.

QByteArray	format () const
	Returns the format that is currently assigned to QImageIOHandler.

virtual bool	canRead () const =0
	Returns `true` if an image can be read from the device (i.e., the image format is supported, the device can be read from and the initial header information suggests that the image can be read); otherwise returns `false`.

virtual bool	read (QImage *image)=0
	Read an image from the device, and stores it in image.

virtual bool	write (const QImage &image)
	Writes the image image to the assigned device.

virtual QVariant	option (ImageOption option) const
	Returns the value assigned to option as a QVariant.

virtual void	setOption (ImageOption option, const QVariant &value)
	Sets the option option with the value value.

virtual bool	supportsOption (ImageOption option) const
	Returns `true` if the QImageIOHandler supports the option option; otherwise returns `false`.

virtual bool	jumpToNextImage ()
	For image formats that support animation, this function jumps to the next image.

virtual bool	jumpToImage (int imageNumber)
	For image formats that support animation, this function jumps to the image whose sequence number is imageNumber.

virtual int	loopCount () const
	For image formats that support animation, this function returns the number of times the animation should loop.

virtual int	imageCount () const
	For image formats that support animation, this function returns the number of images in the animation.

virtual int	nextImageDelay () const
	For image formats that support animation, this function returns the number of milliseconds to wait until reading the next image.

virtual int	currentImageNumber () const
	For image formats that support animation, this function returns the sequence number of the current image in the animation.

virtual QRect	currentImageRect () const
	Returns the rect of the current image.

Static Public Member Functions
static bool	canRead (QIODevice *device)

Static Public Member Functions inherited from QImageIOHandler
static bool	allocateImage (QSize size, QImage::Format format, QImage *image)

Additional Inherited Members
Public Types inherited from QImageIOHandler
enum	ImageOption { Size , ClipRect , Description , ScaledClipRect , ScaledSize , CompressionRatio , Gamma , Quality , Name , SubType , IncrementalReading , Endianness , Animation , BackgroundColor , ImageFormat , SupportedSubTypes , OptimizedWrite , ProgressiveScanWrite , ImageTransformation }
	This enum describes the different options supported by QImageIOHandler. More...

enum	Transformation { TransformationNone = 0 , TransformationMirror = 1 , TransformationFlip = 2 , TransformationRotate180 = TransformationMirror \| TransformationFlip , TransformationRotate90 = 4 , TransformationMirrorAndRotate90 = TransformationMirror \| TransformationRotate90 , TransformationFlipAndRotate90 = TransformationFlip \| TransformationRotate90 , TransformationRotate270 = TransformationRotate180 \| TransformationRotate90 }

Protected Member Functions inherited from QImageIOHandler
	QImageIOHandler (QImageIOHandlerPrivate &dd)

Protected Attributes inherited from QImageIOHandler
QScopedPointer< QImageIOHandlerPrivate >	d_ptr

Detailed Description

Definition at line 25 of file qjpeghandler_p.h.

Constructor & Destructor Documentation

◆ QJpegHandler()

QJpegHandler::QJpegHandler ( )

Definition at line 1000 of file qjpeghandler.cpp.

References d, qCpuHasFeature, qt_convert_rgb888_to_rgb32_mips_dspr2_asm(), qt_convert_rgb888_to_rgb32_neon(), and qt_convert_rgb888_to_rgb32_ssse3().

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◆ ~QJpegHandler()

QJpegHandler::~QJpegHandler ( )

Definition at line 1022 of file qjpeghandler.cpp.

References d.

Member Function Documentation

◆ canRead() [1/2]

bool QJpegHandler::canRead ( ) const

overridevirtual

Returns true if an image can be read from the device (i.e., the image format is supported, the device can be read from and the initial header information suggests that the image can be read); otherwise returns false.

When reimplementing canRead(), make sure that the I/O device (device()) is left in its original state (e.g., by using peek() rather than read()).

See also: read(), QIODevice::peek()

Implements QImageIOHandler.

Definition at line 1027 of file qjpeghandler.cpp.

References canRead(), d, QImageIOHandler::device(), QJpegHandlerPrivate::Error, QJpegHandlerPrivate::ReadingEnd, QJpegHandlerPrivate::Ready, and QImageIOHandler::setFormat().

Referenced by canRead(), QJpegPlugin::capabilities(), and read().

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◆ canRead() [2/2]

bool QJpegHandler::canRead ( QIODevice * device )

static

Definition at line 1040 of file qjpeghandler.cpp.

References QImageIOHandler::device(), QIODevice::peek(), and qCWarning.

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◆ option()

QVariant QJpegHandler::option ( ImageOption option ) const

overridevirtual

Returns the value assigned to option as a QVariant.

The type of the value depends on the option. For example, option(Size) returns a QSize variant.

See also: setOption(), supportsOption()

Reimplemented from QImageIOHandler.

Definition at line 1087 of file qjpeghandler.cpp.

References QImageIOHandler::ClipRect, d, QImageIOHandler::Description, QImageIOHandler::device(), QImageIOHandler::ImageFormat, QImageIOHandler::ImageTransformation, QImageIOHandler::OptimizedWrite, QImageIOHandler::ProgressiveScanWrite, QImageIOHandler::Quality, QImageIOHandler::ScaledClipRect, QImageIOHandler::ScaledSize, and QImageIOHandler::Size.

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◆ read()

bool QJpegHandler::read ( QImage * image )

overridevirtual

Read an image from the device, and stores it in image.

Returns true if the image is successfully read; otherwise returns false.

For image formats that support incremental loading, and for animation formats, the image handler can assume that image points to the previous frame.

See also: canRead()

Implements QImageIOHandler.

Definition at line 1053 of file qjpeghandler.cpp.

References canRead(), and d.

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◆ setOption()

void QJpegHandler::setOption	(	ImageOption	option,
		const QVariant &	value
	)

overridevirtual

Sets the option option with the value value.

See also: option(), ImageOption

Reimplemented from QImageIOHandler.

Definition at line 1121 of file qjpeghandler.cpp.

References QImageIOHandler::ClipRect, d, QImageIOHandler::Description, QImageIOHandler::ImageTransformation, QImageIOHandler::OptimizedWrite, QImageIOHandler::ProgressiveScanWrite, QImageIOHandler::Quality, QImageIOHandler::ScaledClipRect, and QImageIOHandler::ScaledSize.

◆ supportsOption()

bool QJpegHandler::supportsOption ( ImageOption option ) const

overridevirtual

Returns true if the QImageIOHandler supports the option option; otherwise returns false.

For example, if the QImageIOHandler supports the \l Size option, supportsOption(Size) must return true.

See also: setOption(), option()

Reimplemented from QImageIOHandler.

Definition at line 1073 of file qjpeghandler.cpp.

References QImageIOHandler::ClipRect, QImageIOHandler::Description, QImageIOHandler::ImageFormat, QImageIOHandler::ImageTransformation, QImageIOHandler::OptimizedWrite, QImageIOHandler::ProgressiveScanWrite, QImageIOHandler::Quality, QImageIOHandler::ScaledClipRect, QImageIOHandler::ScaledSize, and QImageIOHandler::Size.

◆ write()

bool QJpegHandler::write ( const QImage & image )

overridevirtual

Writes the image image to the assigned device.

Returns true on success; otherwise returns false.

The default implementation does nothing, and simply returns false.

Reimplemented from QImageIOHandler.

Definition at line 1062 of file qjpeghandler.cpp.

References d, QImageIOHandler::device(), qt_imageTransform(), QImageIOHandler::TransformationNone, and write_jpeg_image().

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

qtbase/src/plugins/imageformats/jpeg/qjpeghandler_p.h
qtbase/src/plugins/imageformats/jpeg/qjpeghandler.cpp

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QJpegHandler()

◆ ~QJpegHandler()

Member Function Documentation

◆ canRead() [1/2]

◆ canRead() [2/2]

◆ option()

◆ read()

◆ setOption()

◆ supportsOption()

◆ write()