#[repr(transparent)]
pub struct PixbufLoader { /* private fields */ }
Expand description

Incremental image loader.

PixbufLoader provides a way for applications to drive the process of loading an image, by letting them send the image data directly to the loader instead of having the loader read the data from a file. Applications can use this functionality instead of gdk_pixbuf_new_from_file() or gdk_pixbuf_animation_new_from_file() when they need to parse image data in small chunks. For example, it should be used when reading an image from a (potentially) slow network connection, or when loading an extremely large file.

To use PixbufLoader to load an image, create a new instance, and call PixbufLoaderExt::write() to send the data to it. When done, PixbufLoaderExt::close() should be called to end the stream and finalize everything.

The loader will emit three important signals throughout the process:

  • size-prepared will be emitted as soon as the image has enough information to determine the size of the image to be used. If you want to scale the image while loading it, you can call PixbufLoaderExt::set_size() in response to this signal.
  • area-prepared will be emitted as soon as the pixbuf of the desired has been allocated. You can obtain the Pixbuf instance by calling PixbufLoaderExt::pixbuf(). If you want to use it, simply acquire a reference to it. You can also call gdk_pixbuf_loader_get_pixbuf() later to get the same pixbuf.
  • area-updated will be emitted every time a region is updated. This way you can update a partially completed image. Note that you do not know anything about the completeness of an image from the updated area. For example, in an interlaced image you will need to make several passes before the image is done loading.

Loading an animation

Loading an animation is almost as easy as loading an image. Once the first area-prepared signal has been emitted, you can call PixbufLoaderExt::animation() to get the PixbufAnimation instance, and then call and PixbufAnimationExtManual::iter() to get a PixbufAnimationIter to retrieve the pixbuf for the desired time stamp.

Signals

area-prepared

This signal is emitted when the pixbuf loader has allocated the pixbuf in the desired size.

After this signal is emitted, applications can call gdk_pixbuf_loader_get_pixbuf() to fetch the partially-loaded pixbuf.

area-updated

This signal is emitted when a significant area of the image being loaded has been updated.

Normally it means that a complete scanline has been read in, but it could be a different area as well.

Applications can use this signal to know when to repaint areas of an image that is being loaded.

closed

This signal is emitted when gdk_pixbuf_loader_close() is called.

It can be used by different parts of an application to receive notification when an image loader is closed by the code that drives it.

size-prepared

This signal is emitted when the pixbuf loader has been fed the initial amount of data that is required to figure out the size of the image that it will create.

Applications can call gdk_pixbuf_loader_set_size() in response to this signal to set the desired size to which the image should be scaled.

Implements

PixbufLoaderExt

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impl PixbufLoader

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pub const NONE: Option<&'static PixbufLoader> = None

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pub fn new() -> PixbufLoader

Creates a new pixbuf loader object.

Returns

A newly-created pixbuf loader.

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pub fn with_mime_type(mime_type: &str) -> Result<PixbufLoader, Error>

Creates a new pixbuf loader object that always attempts to parse image data as if it were an image of MIME type @mime_type, instead of identifying the type automatically.

This function is useful if you want an error if the image isn’t the expected MIME type; for loading image formats that can’t be reliably identified by looking at the data; or if the user manually forces a specific MIME type.

The list of supported mime types depends on what image loaders are installed, but typically “image/png”, “image/jpeg”, “image/gif”, “image/tiff” and “image/x-xpixmap” are among the supported mime types. To obtain the full list of supported mime types, call gdk_pixbuf_format_get_mime_types() on each of the #GdkPixbufFormat structs returned by gdk_pixbuf_get_formats().

mime_type

the mime type to be loaded

Returns

A newly-created pixbuf loader.

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pub fn with_type(image_type: &str) -> Result<PixbufLoader, Error>

Creates a new pixbuf loader object that always attempts to parse image data as if it were an image of type @image_type, instead of identifying the type automatically.

This function is useful if you want an error if the image isn’t the expected type; for loading image formats that can’t be reliably identified by looking at the data; or if the user manually forces a specific type.

The list of supported image formats depends on what image loaders are installed, but typically “png”, “jpeg”, “gif”, “tiff” and “xpm” are among the supported formats. To obtain the full list of supported image formats, call gdk_pixbuf_format_get_name() on each of the #GdkPixbufFormat structs returned by gdk_pixbuf_get_formats().

image_type

name of the image format to be loaded with the image

Returns

A newly-created pixbuf loader.

Trait Implementations§

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impl Clone for PixbufLoader

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for PixbufLoader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for PixbufLoader

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Display for PixbufLoader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl HasParamSpec for PixbufLoader

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type ParamSpec = ParamSpecObject

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type SetValue = PixbufLoader

Preferred value to be used as setter for the associated ParamSpec.
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type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, PixbufLoader>

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fn param_spec_builder() -> Self::BuilderFn

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impl Hash for PixbufLoader

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fn hash<H>(&self, state: &mut H)where H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<T: PixbufLoaderImpl> IsSubclassable<T> for PixbufLoader

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fn class_init(class: &mut Class<Self>)

Override the virtual methods of this class for the given subclass and do other class initialization. Read more
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fn instance_init(instance: &mut InitializingObject<T>)

Instance specific initialization. Read more
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impl Ord for PixbufLoader

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fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl ParentClassIs for PixbufLoader

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impl<OT: ObjectType> PartialEq<OT> for PixbufLoader

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fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<OT: ObjectType> PartialOrd<OT> for PixbufLoader

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fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl StaticType for PixbufLoader

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for PixbufLoader

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Immutably borrows from an owned value. Read more
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Tries to downcast to a subclass or interface implementor T. Read more
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Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while upcast will do many checks at compile-time already. downcast will perform the same checks at runtime as dynamic_cast, but will also ensure some amount of compile-time safety. Read more
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Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
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unsafe fn from_glib_full_as_vec(ptr: *mut GList) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_container_as_vec(ptr: *mut GPtrArray) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GPtrArray) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<U> IsSubclassableExt for Uwhere U: IsClass + ParentClassIs,

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Returns true if the object is an instance of (can be cast to) T.
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Returns the type of the object.
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fn object_class(&self) -> &Class<Object>

Returns the ObjectClass of the object. Read more
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Returns the class of the object.
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Returns the class of the object in the given type T. Read more
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Returns the interface T of the object. Read more
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Sets the property property_name of the object to value value. Read more
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Sets the property property_name of the object to value value. Read more
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Sets multiple properties of the object at once. Read more
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Sets multiple properties of the object at once. Read more
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Gets the property property_name of the object and cast it to the type V. Read more
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Check if the object has a property property_name of the given type_. Read more
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Get the type of the property property_name of this object. Read more
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fn find_property(&self, property_name: &str) -> Option<ParamSpec>

Get the ParamSpec of the property property_name of this object.
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fn list_properties(&self) -> PtrSlice<ParamSpec>

Return all ParamSpec of the properties of this object.
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fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

Freeze all property notifications until the return guard object is dropped. Read more
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unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where QD: 'static,

Set arbitrary data on this object with the given key. Read more
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Return previously set arbitrary data of this object with the given key. Read more
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Retrieve previously set arbitrary data of this object with the given key. Read more
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Set arbitrary data on this object with the given key. Read more
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Return previously set arbitrary data of this object with the given key. Read more
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Block a given signal handler. Read more
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Unblock a given signal handler.
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Stop emission of the currently emitted signal.
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Stop emission of the currently emitted signal by the (possibly detailed) signal name.
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Connect to the signal signal_id on this object. Read more
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Connect to the signal signal_name on this object. Read more
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Connect to the signal signal_id on this object. Read more
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Connect to the signal signal_name on this object. Read more
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unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,

Connect to the signal signal_id on this object. Read more
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Connect a closure to the signal signal_name on this object. Read more
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Connect a closure to the signal signal_id on this object. Read more
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fn watch_closure(&self, closure: &impl AsRef<Closure>)

Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures.
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Emit signal by its name. Read more
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Emit signal by its name with details. Read more
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Emit signal by its name with details. Read more
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Emit signal by signal id with details. Read more
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fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by signal id with details. Read more
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fn disconnect(&self, handler_id: SignalHandlerId)

Disconnect a previously connected signal handler.
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fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,

Connect to the notify signal of the object. Read more
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fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,

Connect to the notify signal of the object. Read more
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unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),

Connect to the notify signal of the object. Read more
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fn notify(&self, property_name: &str)

Notify that the given property has changed its value. Read more
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fn notify_by_pspec(&self, pspec: &ParamSpec)

Notify that the given property has changed its value. Read more
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fn downgrade(&self) -> WeakRef<T>

Downgrade this object to a weak reference.
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fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + Send + 'static,

Add a callback to be notified when the Object is disposed.
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fn bind_property<'f, 't, O, 'a>( &'a self, source_property: &'a str, target: &'a O, target_property: &'a str ) -> BindingBuilder<'a, 'f, 't>where O: ObjectType,

Bind property source_property on this object to the target_property on the target object. Read more
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fn ref_count(&self) -> u32

Returns the strong reference count of this object.
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unsafe fn run_dispose(&self)

Runs the dispose mechanism of the object. Read more
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impl<O> PixbufLoaderExt for Owhere O: IsA<PixbufLoader>,

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fn close(&self) -> Result<(), Error>

Informs a pixbuf loader that no further writes with gdk_pixbuf_loader_write() will occur, so that it can free its internal loading structures. Read more
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fn animation(&self) -> Option<PixbufAnimation>

Queries the #GdkPixbufAnimation that a pixbuf loader is currently creating. Read more
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fn format(&self) -> Option<PixbufFormat>

Obtains the available information about the format of the currently loading image file. Read more
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fn pixbuf(&self) -> Option<Pixbuf>

Queries the #GdkPixbuf that a pixbuf loader is currently creating. Read more
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fn set_size(&self, width: i32, height: i32)

Causes the image to be scaled while it is loaded. Read more
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fn write(&self, buf: &[u8]) -> Result<(), Error>

Parses the next count bytes in the given image buffer. Read more
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fn write_bytes(&self, buffer: &Bytes) -> Result<(), Error>

Parses the next contents of the given image buffer. Read more
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fn connect_area_prepared<F>(&self, f: F) -> SignalHandlerIdwhere F: Fn(&O) + 'static,

This signal is emitted when the pixbuf loader has allocated the pixbuf in the desired size. Read more
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fn connect_area_updated<F>(&self, f: F) -> SignalHandlerIdwhere F: Fn(&O, i32, i32, i32, i32) + 'static,

This signal is emitted when a significant area of the image being loaded has been updated. Read more
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fn connect_closed<F>(&self, f: F) -> SignalHandlerIdwhere F: Fn(&O) + 'static,

This signal is emitted when gdk_pixbuf_loader_close() is called. Read more
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fn connect_size_prepared<F>(&self, f: F) -> SignalHandlerIdwhere F: Fn(&O, i32, i32) + 'static,

This signal is emitted when the pixbuf loader has been fed the initial amount of data that is required to figure out the size of the image that it will create. Read more
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impl<T> Property for Twhere T: HasParamSpec,

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type Value = T

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impl<T> PropertyGet for Twhere T: HasParamSpec,

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type Value = T

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fn get<R, F>(&self, f: F) -> Rwhere F: Fn(&<T as PropertyGet>::Value) -> R,

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impl<T> StaticTypeExt for Twhere T: StaticType,

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fn ensure_type()

Ensures that the type has been registered with the type system.
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T> TransparentType for Twhere T: TransparentPtrType,

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T> TryFromClosureReturnValue for Twhere T: for<'a> FromValue<'a> + StaticType + 'static,

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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Super, Sub> CanDowncast<Sub> for Superwhere Super: IsA<Super>, Sub: IsA<Super>,

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impl<'a, T, C, E> FromValueOptional<'a> for Twhere T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + 'static,