gtkmm: Gdk::PixbufAnimation Class Reference

The gdk-pixbuf library provides a simple mechanism to load and represent animations. More...

#include <gdkmm/pixbufanimation.h>

Inheritance diagram for Gdk::PixbufAnimation:

Public Member Functions
	PixbufAnimation (PixbufAnimation && src) noexcept

PixbufAnimation &	operator= (PixbufAnimation && src) noexcept

	~PixbufAnimation () noexcept override

GdkPixbufAnimation *	gobj ()
	Provides access to the underlying C GObject. More...

const GdkPixbufAnimation *	gobj () const
	Provides access to the underlying C GObject. More...

GdkPixbufAnimation *	gobj_copy ()
	Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...

int	get_width () const
	Queries the width of the bounding box of a pixbuf animation. More...

int	get_height () const
	Queries the height of the bounding box of a pixbuf animation. More...

bool	is_static_image () const
	Checks whether the animation is a static image. More...

Glib::RefPtr< Pixbuf >	get_static_image ()
	Retrieves a static image for the animation. More...

Glib::RefPtr< PixbufAnimationIter >	get_iter (gint64 start_time=g_get_real_time())
	Get an iterator for displaying an animation. More...

Static Public Member Functions
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system. More...

static Glib::RefPtr< PixbufAnimation >	create_from_file (const std::string & filename)
	Creates a new animation by loading it from a file. More...

static Glib::RefPtr< PixbufAnimation >	create_from_stream (const Glib::RefPtr< Gio::InputStream > & stream, const Glib::RefPtr< Gio::Cancellable > & cancellable={})
	Creates a new animation by loading it from an input stream. More...

static void	create_from_stream_async (const Glib::RefPtr< Gio::InputStream > & stream, const Gio::SlotAsyncReady & slot, const Glib::RefPtr< Gio::Cancellable > & cancellable={})
	Creates a new animation by asynchronously loading an image from an input stream. More...

static Glib::RefPtr< PixbufAnimation >	create_from_stream_finish (const Glib::RefPtr< Gio::AsyncResult > & result)
	Finishes an asynchronous pixbuf animation creation operation started with gdk_pixbuf_pixbuf_animation_new_from_stream_async(). More...

static Glib::RefPtr< PixbufAnimation >	create_from_resource (const std::string & resource_path)
	Creates a new pixbuf animation by loading an image from an resource. More...

Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Gdk::PixbufAnimation >	wrap (GdkPixbufAnimation * object, bool take_copy=false)
	A Glib::wrap() method for this object. More...

Detailed Description

The gdk-pixbuf library provides a simple mechanism to load and represent animations.

An animation is conceptually a series of frames to be displayed over time. Each frame is the same size. The animation may not be represented as a series of frames internally; for example, it may be stored as a sprite and instructions for moving the sprite around a background. To display an animation you don't need to understand its representation, however; you just ask gdk-pixbuf what should be displayed at a given point in time.

Constructor & Destructor Documentation

◆ PixbufAnimation()

Gdk::PixbufAnimation::PixbufAnimation ( PixbufAnimation && src )

noexcept

◆ ~PixbufAnimation()

Gdk::PixbufAnimation::~PixbufAnimation ( )

overridenoexcept

Member Function Documentation

◆ create_from_file()

static Glib::RefPtr< PixbufAnimation > Gdk::PixbufAnimation::create_from_file ( const std::string & filename )

static

Creates a new animation by loading it from a file.

The file format is detected automatically.

If the file's format does not support multi-frame images, then an animation with a single frame will be created.

Possible errors are in the GDK_PIXBUF_ERROR and G_FILE_ERROR domains.

Parameters

filename Name of file to load, in the GLib file name encoding.

Returns: A newly-created animation.

Exceptions

Glib::Error

◆ create_from_resource()

static Glib::RefPtr< PixbufAnimation > Gdk::PixbufAnimation::create_from_resource ( const std::string & resource_path )

static

Creates a new pixbuf animation by loading an image from an resource.

The file format is detected automatically. If nullptr is returned, then error will be set.

Since gtkmm 4.4:

Parameters

resource_path The path of the resource file.

Returns: A newly-created animation.

Exceptions

Glib::Error

◆ create_from_stream()

static Glib::RefPtr< PixbufAnimation > Gdk::PixbufAnimation::create_from_stream	(	const Glib::RefPtr< Gio::InputStream > &	stream,
		const Glib::RefPtr< Gio::Cancellable > &	cancellable = `{}`
	)

static

Creates a new animation by loading it from an input stream.

The file format is detected automatically.

If nullptr is returned, then error will be set.

The cancellable can be used to abort the operation from another thread. If the operation was cancelled, the error Gio::Error::CANCELLED will be returned. Other possible errors are in the GDK_PIXBUF_ERROR and G_IO_ERROR domains.

The stream is not closed.

Since gtkmm 4.4:

Parameters

stream	A `Gio::InputStream` to load the pixbuf from.
cancellable	Optional `Gio::Cancellable` object.

Returns: A newly-created animation.

Exceptions

Glib::Error

◆ create_from_stream_async()

static void Gdk::PixbufAnimation::create_from_stream_async	(	const Glib::RefPtr< Gio::InputStream > &	stream,
		const Gio::SlotAsyncReady &	slot,
		const Glib::RefPtr< Gio::Cancellable > &	cancellable = `{}`
	)

static

Creates a new animation by asynchronously loading an image from an input stream.

For more details see new_from_stream(), which is the synchronous version of this function.

When the operation is finished, callback will be called in the main thread. You can then call new_from_stream_finish() to get the result of the operation.

Since gtkmm 4.4:

Parameters

stream	A Gio::InputStream from which to load the animation.
cancellable	Optional Gio::Cancellable object.
slot	A `SlotAsyncReady` to call when the pixbuf is loaded.

◆ create_from_stream_finish()

static Glib::RefPtr< PixbufAnimation > Gdk::PixbufAnimation::create_from_stream_finish ( const Glib::RefPtr< Gio::AsyncResult > & result )

static

Finishes an asynchronous pixbuf animation creation operation started with gdk_pixbuf_pixbuf_animation_new_from_stream_async().

Since gtkmm 4.4:

Parameters

result A Gio::AsyncResult.

Returns: The newly created animation.

Exceptions

Glib::Error

◆ get_height()

int Gdk::PixbufAnimation::get_height ( ) const

Queries the height of the bounding box of a pixbuf animation.

Returns: Height of the bounding box of the animation.

◆ get_iter()

Glib::RefPtr< PixbufAnimationIter > Gdk::PixbufAnimation::get_iter ( gint64 start_time = g_get_real_time() )

Get an iterator for displaying an animation.

The iterator provides the frames that should be displayed at a given time.

start_time would normally come from g_get_real_time(), and marks the beginning of animation playback. After creating an iterator, you should immediately display the pixbuf returned by Gdk::PixbufAnimationIter::get_pixbuf(). Then, you should install a timeout (with Glib::signal_timeout().connect()) or by some other mechanism ensure that you'll update the image after Gdk::PixbufAnimationIter::get_delay_time() milliseconds. Each time the image is updated, you should reinstall the timeout with the new, possibly-changed delay time.

As a shortcut, the default value of start_time is g_get_real_time().

To update the image (i.e. possibly change the result of Gdk::PixbufAnimationIter::get_pixbuf() to a new frame of the animation), call Gdk::PixbufAnimationIter::advance().

If you're using Gdk::PixbufLoader, in addition to updating the image after the delay time, you should also update it whenever you receive the area_updated signal and Gdk::PixbufAnimationIter::on_currently_loading_frame() returns true. In this case, the frame currently being fed into the loader has received new data, so needs to be refreshed. The delay time for a frame may also be modified after an area_updated signal, for example if the delay time for a frame is encoded in the data after the frame itself. So your timeout should be reinstalled after any area_updated signal.

A delay time of -1 is possible, indicating "infinite."

Parameters

start_time Time when the animation starts playing.

Returns: An iterator to move over the animation.

◆ get_static_image()

Glib::RefPtr< Pixbuf > Gdk::PixbufAnimation::get_static_image ( )

Retrieves a static image for the animation.

If an animation is really just a plain image (has only one frame), this function returns that image.

If the animation is an animation, this function returns a reasonable image to use as a static unanimated image, which might be the first frame, or something more sophisticated depending on the file format.

If an animation hasn't loaded any frames yet, this function will return nullptr.

Returns: Unanimated image representing the animation.

◆ get_type()

static GType Gdk::PixbufAnimation::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.

◆ get_width()

int Gdk::PixbufAnimation::get_width ( ) const

Queries the width of the bounding box of a pixbuf animation.

Returns: Width of the bounding box of the animation.

◆ gobj() [1/2]

GdkPixbufAnimation * Gdk::PixbufAnimation::gobj ( )

inline

Provides access to the underlying C GObject.

◆ gobj() [2/2]

const GdkPixbufAnimation * Gdk::PixbufAnimation::gobj ( ) const

inline

Provides access to the underlying C GObject.

◆ gobj_copy()

GdkPixbufAnimation * Gdk::PixbufAnimation::gobj_copy ( )

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

◆ is_static_image()

bool Gdk::PixbufAnimation::is_static_image ( ) const

Checks whether the animation is a static image.

If you load a file with new_from_file() and it turns out to be a plain, unanimated image, then this function will return true. Use get_static_image() to retrieve the image.

Returns: true if the "animation" was really just an image.

◆ operator=()

PixbufAnimation & Gdk::PixbufAnimation::operator= ( PixbufAnimation && src )

noexcept

Friends And Related Function Documentation

◆ wrap()

Glib::RefPtr< Gdk::PixbufAnimation > wrap	(	GdkPixbufAnimation *	object,
		bool	take_copy = `false`
	)

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns: A C++ instance that wraps this C instance.

Public Member Functions

Static Public Member Functions

Related Functions

Detailed Description

Constructor & Destructor Documentation

◆ PixbufAnimation()

◆ ~PixbufAnimation()

Member Function Documentation

◆ create_from_file()

◆ create_from_resource()

◆ create_from_stream()

◆ create_from_stream_async()

◆ create_from_stream_finish()

◆ get_height()

◆ get_iter()

◆ get_static_image()

◆ get_type()

◆ get_width()

◆ gobj() [1/2]

◆ gobj() [2/2]

◆ gobj_copy()

◆ is_static_image()

◆ operator=()

Friends And Related Function Documentation

◆ wrap()