#include <qgifhandler_p.h>

Inheritance diagram for QGifHandler:

Collaboration diagram for QGifHandler:

Public Member Functions
	QGifHandler ()
	~QGifHandler ()
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`.
int	imageCount () const override
	For image formats that support animation, this function returns the number of images in the animation.
int	loopCount () const override
	For image formats that support animation, this function returns the number of times the animation should loop.
int	nextImageDelay () const override
	For image formats that support animation, this function returns the number of milliseconds to wait until reading the next image.
int	currentImageNumber () const override
	For image formats that support animation, this function returns the sequence number of the current image in the animation.
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	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 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 qgifhandler_p.h.

Constructor & Destructor Documentation

◆ QGifHandler()

QGifHandler::QGifHandler ( )

Definition at line 1038 of file qgifhandler.cpp.

◆ ~QGifHandler()

QGifHandler::~QGifHandler ( )

Definition at line 1047 of file qgifhandler.cpp.

Member Function Documentation

◆ canRead() [1/2]

bool QGifHandler::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 1074 of file qgifhandler.cpp.

References canRead().

Referenced by canRead().

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Here is the caller graph for this function:

◆ canRead() [2/2]

bool QGifHandler::canRead ( QIODevice * device )

static

Definition at line 1084 of file qgifhandler.cpp.

◆ currentImageNumber()

int QGifHandler::currentImageNumber ( ) const

overridevirtual

For image formats that support animation, this function returns the sequence number of the current image in the animation.

If this function is called before any image is read(), -1 is returned. The number of the first image in the sequence is 0.

If the image format does not support animation, 0 is returned.

See also: read()

Reimplemented from QImageIOHandler.

Definition at line 1197 of file qgifhandler.cpp.

◆ imageCount()

int QGifHandler::imageCount ( ) const

overridevirtual

For image formats that support animation, this function returns the number of images in the animation.

If the image format does not support animation, or if it is unable to determine the number of images, 0 is returned.

The default implementation returns 1 if canRead() returns true; otherwise 0 is returned.

Reimplemented from QImageIOHandler.

Definition at line 1173 of file qgifhandler.cpp.

◆ loopCount()

int QGifHandler::loopCount ( ) const

overridevirtual

For image formats that support animation, this function returns the number of times the animation should loop.

If the image format does not support animation, 0 is returned.

Reimplemented from QImageIOHandler.

Definition at line 1182 of file qgifhandler.cpp.

◆ nextImageDelay()

int QGifHandler::nextImageDelay ( ) const

overridevirtual

For image formats that support animation, this function returns the number of milliseconds to wait until reading the next image.

If the image format does not support animation, 0 is returned.

Reimplemented from QImageIOHandler.

Definition at line 1168 of file qgifhandler.cpp.

◆ option()

QVariant QGifHandler::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 1141 of file qgifhandler.cpp.

◆ read()

bool QGifHandler::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 1098 of file qgifhandler.cpp.

◆ setOption()

void QGifHandler::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 1162 of file qgifhandler.cpp.

◆ supportsOption()

bool QGifHandler::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 1132 of file qgifhandler.cpp.

◆ write()

bool QGifHandler::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 1126 of file qgifhandler.cpp.

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

qtbase/src/plugins/imageformats/gif/qgifhandler_p.h (05fc3aef53348fb58be6308076e000825b704e58)
qtbase/src/plugins/imageformats/gif/qgifhandler.cpp (5157ce7c59b704bd080908f24c6ccdf7cb585eeb)

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QGifHandler()

◆ ~QGifHandler()

Member Function Documentation

◆ canRead() [1/2]

◆ canRead() [2/2]

◆ currentImageNumber()

◆ imageCount()

◆ loopCount()

◆ nextImageDelay()

◆ option()

◆ read()

◆ setOption()

◆ supportsOption()

◆ write()