Bitmap streamer base class. More...

#include <ilviews/bitmaps/streamer.h>

Inheritance diagram for IlvBitmapStreamer:

Public Member Functions
virtual void	callReadProgressCallback (IlUInt current, IlUInt max)
	Calls the callback for read progression. More...

virtual void	callWriteProgressCallback (IlUInt current, IlUInt max)
	Calls the callback for write progression. More...

virtual IlBoolean	canRead () const
	Indicates whether the instance can read from a stream. Default is `IlFalse`. More...

virtual IlBoolean	canWrite () const
	Indicates whether the instance can write to a stream. Default is `IlFalse`. More...

virtual IlBoolean	checkSignature (const IlUChar *data, IlUInt size)=0
	Indicates whether the instance can handle the stream. More...

virtual const char *	getName () const
	Returns the internal name of the streamer. More...

IlvQuantizer *	getQuantizer () const
	Returns the quantizer used by this streamer. More...

virtual IlvBitmapData *	read (std::istream &stream)
	Reads from a stream. More...

virtual IlvBitmapInformation *	readInfo (std::istream &stream)
	Reads information from a stream. More...

void	setQuantizer (IlvQuantizer *quantizer)
	Sets the quantizer used (if needed) by this streamer. More...

virtual void	setReadProgressCallback (IlvProgressCallback rpCallback, IlAny arg=0)
	Sets the callback for read progression. More...

virtual void	setWriteProgressCallback (IlvProgressCallback wpCallback, IlAny arg=0)
	Sets the callback for write progression. More...

virtual IlBoolean	write (IlvBitmapData *bitmapData, std::ostream &stream)
	Writes an `IlvBitmapData` to a stream. More...

Public Member Functions inherited from IlvValueInterface
virtual IlBoolean	applyValue (const IlvValue &value)
	Apply an accessor. More...

virtual IlBoolean	changeValue (const IlvValue &val)
	Changes the value of an accessor. More...

virtual IlBoolean	changeValues (const IlvValue *values, IlUShort count=0)
	Changes several accessor values simultaneously. More...

virtual void	getAccessors (const IlSymbol const names, const IlvValueTypeClass const **types, IlUInt &count) const
	Retrieves the list of available accessors of an object. More...

virtual IlvValue &	queryValue (IlvValue &val) const
	Retrieves an accessor value. More...

virtual void	queryValues (IlvValue *values, IlUShort count) const
	Retrieves multiple accessor values simultaneously. More...

Static Public Member Functions
static IlvBitmapStreamer *	Get (const char *name)
	Returns a streamer from its name. More...

static IlvBitmapStreamer **	GetRegisteredStreamers (IlUInt &count)
	Returns the registered streamers. More...

static IlvBitmap *	Read (IlvDisplay display, std::istream &stream, const IlUChar signature, IlUInt signatureLen)
	Reads a bitmap using the registered streamers. More...

static IlvBitmapData *	ReadBitmapData (std::istream &stream, const IlUChar *signature, IlUInt signatureLen)
	Reads bitmap data using the registered streamers. More...

static IlvBitmapInformation *	ReadInfo (std::istream &stream, const IlUChar *signature, IlUInt signatureLen)
	Reads bitmap information using the registered streamers. More...

static void	Register (IlvBitmapStreamer *streamer)
	Registers the given streamer. More...

static IlBoolean	UnRegister (IlvBitmapStreamer *streamer)
	Unregisters the given streamer. More...

Detailed Description

Bitmap streamer base class.

Library: xviews or winviews or mviews (mutually exclusive)

This class provides methods to read/write IlvBitmapData from/to a stream. This is a virtual class that must be subclassed. The stream can be checked for a specific format signature. A bitmap streamer can declare if it knows how to read or write. When reading or writing, callbacks can be called to indicate progression.

Member Function Documentation

§ callReadProgressCallback()

virtual void IlvBitmapStreamer::callReadProgressCallback	(	IlUInt	current,
		IlUInt	max
	)

virtual

Calls the callback for read progression.

Parameters

current	The current read progress value.
max	The maximum read progress value.

§ callWriteProgressCallback()

virtual void IlvBitmapStreamer::callWriteProgressCallback	(	IlUInt	current,
		IlUInt	max
	)

virtual

Calls the callback for write progression.

Parameters

current	The current write progress value.
max	The maximum write progress value.

§ canRead()

virtual IlBoolean IlvBitmapStreamer::canRead ( ) const

virtual

Indicates whether the instance can read from a stream. Default is IlFalse.

Returns: IlTrue if the instance can read from a stream.

Reimplemented in IlvTIFFStreamer, IlvPNGStreamer, IlvGIFStreamer, IlvBMPStreamer, IlvJPGStreamer, IlvPPMStreamer, IlvRGBStreamer, and IlvWBMPStreamer.

§ canWrite()

virtual IlBoolean IlvBitmapStreamer::canWrite ( ) const

virtual

Indicates whether the instance can write to a stream. Default is IlFalse.

Returns: IlTrue if the instance can write to a stream.

Reimplemented in IlvTIFFStreamer, IlvPNGStreamer, IlvGIFStreamer, IlvBMPStreamer, IlvJPGStreamer, IlvPPMStreamer, IlvRGBStreamer, and IlvWBMPStreamer.

§ checkSignature()

virtual IlBoolean IlvBitmapStreamer::checkSignature	(	const IlUChar *	data,
		IlUInt	size
	)

pure virtual

Indicates whether the instance can handle the stream.

Parameters

data	The stream signature.
size	The size of the stream signature.

Returns: IlTrue if the instance recognizes the signature.

Implemented in IlvJPGStreamer, IlvWBMPStreamer, IlvPNGStreamer, IlvGIFStreamer, IlvTIFFStreamer, IlvBMPStreamer, IlvPPMStreamer, and IlvRGBStreamer.

§ Get()

static IlvBitmapStreamer* IlvBitmapStreamer::Get ( const char * name )

static

Returns a streamer from its name.

Parameters

name	The name of the streamer.

§ getName()

virtual const char* IlvBitmapStreamer::getName ( ) const

virtual

Returns the internal name of the streamer.

Returns: The name of the streamer.

Reimplemented from IlvValueInterface.

§ getQuantizer()

IlvQuantizer* IlvBitmapStreamer::getQuantizer ( ) const

Returns the quantizer used by this streamer.

Returns: The quantizer.

§ GetRegisteredStreamers()

static IlvBitmapStreamer** IlvBitmapStreamer::GetRegisteredStreamers ( IlUInt & count )

static

Returns the registered streamers.

Parameters

count The number of registered streamers.

Returns: An array of count streamers.

§ read()

virtual IlvBitmapData* IlvBitmapStreamer::read ( std::istream & stream )

virtual

Reads from a stream.

Parameters

stream The stream to read from.

Returns: An instance of IlvBitmapData.

Reimplemented in IlvPNGStreamer, and IlvGIFStreamer.

§ Read()

static IlvBitmap* IlvBitmapStreamer::Read	(	IlvDisplay *	display,
		std::istream &	stream,
		const IlUChar *	signature,
		IlUInt	signatureLen
	)

static

Reads a bitmap using the registered streamers.

Parameters

display	The display to use.
stream	The stream to read from.
signature	The first bytes of the stream.
signatureLen	The size of the signature.

§ ReadBitmapData()

static IlvBitmapData* IlvBitmapStreamer::ReadBitmapData	(	std::istream &	stream,
		const IlUChar *	signature,
		IlUInt	signatureLen
	)

static

Reads bitmap data using the registered streamers.

Parameters

stream	The stream to read from.
signature	The first bytes of the stream.
signatureLen	The size of the signature.

§ readInfo()

virtual IlvBitmapInformation* IlvBitmapStreamer::readInfo ( std::istream & stream )

virtual

Reads information from a stream.

Parameters

stream The stream to read from.

Returns: An instance of IlvBitmapInformation.

§ ReadInfo()

static IlvBitmapInformation* IlvBitmapStreamer::ReadInfo	(	std::istream &	stream,
		const IlUChar *	signature,
		IlUInt	signatureLen
	)

static

Reads bitmap information using the registered streamers.

Parameters

stream	The stream to read from.
signature	The first bytes of the stream.
signatureLen	The size of the signature.

§ Register()

static void IlvBitmapStreamer::Register ( IlvBitmapStreamer * streamer )

static

Registers the given streamer.

Parameters

streamer The streamer to register.

§ setQuantizer()

void IlvBitmapStreamer::setQuantizer ( IlvQuantizer * quantizer )

Sets the quantizer used (if needed) by this streamer.

Parameters

quantizer The new quantizer.

§ setReadProgressCallback()

virtual void IlvBitmapStreamer::setReadProgressCallback	(	IlvProgressCallback	rpCallback,
		IlAny	arg = `0`
	)

virtual

Sets the callback for read progression.

The callback indicating read progression will be called. The arguments of the callback will be the current bitmap streamer, the current read progress value, the maximum read progress value, and a user-defined argument.

Parameters

rpCallback	The read progression callback.
arg	A user-defined argument.

§ setWriteProgressCallback()

virtual void IlvBitmapStreamer::setWriteProgressCallback	(	IlvProgressCallback	wpCallback,
		IlAny	arg = `0`
	)

virtual

Sets the callback for write progression.

The callback will be called indicating write progression. The arguments to the callback will be the current bitmap streamer, the current write progress value, the maximum write progress value, and a user-defined argument.

Parameters

wpCallback	The write progression callback.
arg	A user-defined argument.

§ UnRegister()

static IlBoolean IlvBitmapStreamer::UnRegister ( IlvBitmapStreamer * streamer )

static

Unregisters the given streamer.

Parameters

streamer The streamer to unregister.

§ write()

virtual IlBoolean IlvBitmapStreamer::write	(	IlvBitmapData *	bitmapData,
		std::ostream &	stream
	)

virtual

Writes an IlvBitmapData to a stream.

Parameters

bitmapData	The bitmap data to write.
stream	The stream to write to.

Returns: IlTrue if the bitmap data has been written.

Reimplemented in IlvPNGStreamer.

Public Member Functions

Static Public Member Functions

Detailed Description

Member Function Documentation

§ callReadProgressCallback()

§ callWriteProgressCallback()

§ canRead()

§ canWrite()

§ checkSignature()

§ Get()

§ getName()

§ getQuantizer()

§ GetRegisteredStreamers()

§ read()

§ Read()

§ ReadBitmapData()

§ readInfo()

§ ReadInfo()

§ Register()

§ setQuantizer()

§ setReadProgressCallback()

§ setWriteProgressCallback()

§ UnRegister()

§ write()