ImageIoPlugin Class Reference

Description of an image file format. More...

#include <cc/ImageIoPlugin>

Inheritance diagram for ImageIoPlugin:

Public Member Functions
	ImageIoPlugin ()=default
	Create a null image plugin.
	ImageIoPlugin (const String &mediaType, const String &fileSuffix="")
	Get access to an image I/O plugin for given mediaType and/or fileSuffix.
String	mediaType () const
	Unqiue name identifying this plugin.
List< String >	fileSuffix () const
	Common file name extensions used for this image format.
bool	detect (const Bytes &data, Out< int > width=None{}, Out< int > height=None{}) const
	Check if data is of this image file format and optionally return the width and height of the image.
Image	decode (const Bytes &data) const
	Load the image from given data.
bool	decodeInto (InOut< Image > image, const Bytes &data) const
	Load image from data.
void	encode (const Stream &sink, const Image &image) const
	Write encoded image to sink.
Public Member Functions inherited from Object
	Object ()=default
	Create a null object.
	operator bool () const
	Check if this is a non-null object.
bool	isNull () const
	Check if this is a null object.
int	useCount () const
	Reference count.
template<class T>
bool	is () const
	Check if this object is of type T.
template<class T>
T	as () const
	Cast this object to type T.
bool	isWeak () const
	Check if the underlying object reference is weak.
bool	operator== (const Object &other) const
	Equality operator.
std::strong_ordering	operator<=> (const Object &other) const
	Ordering operator.

Static Public Member Functions
static ImageIoPlugin	detect (const String &path, const Bytes &data, Out< int > width=None{}, Out< int > height=None{})
	Detect image I/O plugin for loading an image.

Protected Member Functions
	ImageIoPlugin (State *newState)
const State &	me () const
Protected Member Functions inherited from Object
template<class T>
T	weak () const
template<class T>
void	initOnce ()
	Create the object state when called the first time.
template<class T>
void	initOncePerThread ()
	Create a distinct object state for each thread when called the first time in that thread.
	Object (State *newState)
	Initialize object with newState.
	Object (State *state, Alias)
	Object (State *state, Weak)
Object &	operator= (std::nullptr_t)

Additional Inherited Members
Public Types inherited from Object
using	NullAccess = cc::NullAccess
	Error thrown when trying to access a null object.
using	VirginityTestFailed = cc::VirginityTestFailed
	Error thrown when trying to initialize an object with a non-virgin state.
Static Protected Member Functions inherited from Object
template<class T>
static T	alias (const State *state)
	Create an alias object for the given state.
template<class T>
static T	weak (const State *state)
Protected Attributes inherited from Object
Handle< State >	me
	Internal object state

Detailed Description

Description of an image file format.

See also

ImageIoPluginManager

Constructor & Destructor Documentation

ImageIoPlugin() [1/2]

ImageIoPlugin ( )

default

Create a null image plugin.

ImageIoPlugin() [2/2]

ImageIoPlugin ( const String & mediaType, const String & fileSuffix = "" )

explicit

Get access to an image I/O plugin for given mediaType and/or fileSuffix.

Member Function Documentation

detect() [1/2]

ImageIoPlugin detect ( const String & path, const Bytes & data, Out< int > width = None{}, Out< int > height = None{} )

static

Detect image I/O plugin for loading an image.

Parameters

path	File path
data	File contents
width	Returns the image width
height	Returns the image height

Returns

ImageIoPlugin needed to load the image

mediaType()

String mediaType

(

)

const

Unqiue name identifying this plugin.

fileSuffix()

List< String > fileSuffix

(

)

const

Common file name extensions used for this image format.

detect() [2/2]

bool detect	(	const Bytes &	data,
		Out< int >	width = None{},
		Out< int >	height = None{} ) const

Check if data is of this image file format and optionally return the width and height of the image.

decode()

Image decode

(

const Bytes &

data

)

const

Load the image from given data.

Returns

Loaded image if decoding data was successful

A null image if decoding data failed

decodeInto()

bool decodeInto	(	InOut< Image >	image,
		const Bytes &	data ) const

Load image from data.

Parameters

image	Target image (output is scaled to match the user-defined size)
data	Encoded image data

Returns

true if image could be loaded successfully

encode()

void encode	(	const Stream &	sink,
		const Image &	image ) const

Write encoded image to sink.

Parameters

sink	Output sink to write the encoded image to
image	Source image