Struct gdk_pixbuf::PixbufLoader
source · #[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 callPixbufLoaderExt::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 thePixbuf
instance by callingPixbufLoaderExt::pixbuf()
. If you want to use it, simply acquire a reference to it. You can also callgdk_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
Implementations§
source§impl PixbufLoader
impl PixbufLoader
pub const NONE: Option<&'static PixbufLoader> = None
sourcepub fn new() -> PixbufLoader
pub fn new() -> PixbufLoader
sourcepub fn with_mime_type(mime_type: &str) -> Result<PixbufLoader, Error>
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.
sourcepub fn with_type(image_type: &str) -> Result<PixbufLoader, Error>
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§
source§impl Clone for PixbufLoader
impl Clone for PixbufLoader
source§impl Debug for PixbufLoader
impl Debug for PixbufLoader
source§impl Default for PixbufLoader
impl Default for PixbufLoader
source§impl Display for PixbufLoader
impl Display for PixbufLoader
source§impl HasParamSpec for PixbufLoader
impl HasParamSpec for PixbufLoader
type ParamSpec = ParamSpecObject
§type SetValue = PixbufLoader
type SetValue = PixbufLoader
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, PixbufLoader>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for PixbufLoader
impl Hash for PixbufLoader
source§impl<T: PixbufLoaderImpl> IsSubclassable<T> for PixbufLoader
impl<T: PixbufLoaderImpl> IsSubclassable<T> for PixbufLoader
source§fn class_init(class: &mut Class<Self>)
fn class_init(class: &mut Class<Self>)
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
source§impl Ord for PixbufLoader
impl Ord for PixbufLoader
source§impl ParentClassIs for PixbufLoader
impl ParentClassIs for PixbufLoader
source§impl<OT: ObjectType> PartialEq<OT> for PixbufLoader
impl<OT: ObjectType> PartialEq<OT> for PixbufLoader
source§impl<OT: ObjectType> PartialOrd<OT> for PixbufLoader
impl<OT: ObjectType> PartialOrd<OT> for PixbufLoader
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for PixbufLoader
impl StaticType for PixbufLoader
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for PixbufLoader
Auto Trait Implementations§
impl RefUnwindSafe for PixbufLoader
impl !Send for PixbufLoader
impl !Sync for PixbufLoader
impl Unpin for PixbufLoader
impl UnwindSafe for PixbufLoader
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fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + 'static,
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read moresource§fn notify(&self, property_name: &str)
fn notify(&self, property_name: &str)
source§fn notify_by_pspec(&self, pspec: &ParamSpec)
fn notify_by_pspec(&self, pspec: &ParamSpec)
source§fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>where
F: FnOnce() + Send + 'static,
fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + Send + 'static,
source§fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where
F: FnOnce() + 'static,
fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + 'static,
source§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,
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,
source§unsafe fn run_dispose(&self)
unsafe fn run_dispose(&self)
source§impl<O> PixbufLoaderExt for Owhere
O: IsA<PixbufLoader>,
impl<O> PixbufLoaderExt for Owhere O: IsA<PixbufLoader>,
source§fn close(&self) -> Result<(), Error>
fn close(&self) -> Result<(), Error>
source§fn animation(&self) -> Option<PixbufAnimation>
fn animation(&self) -> Option<PixbufAnimation>
source§fn format(&self) -> Option<PixbufFormat>
fn format(&self) -> Option<PixbufFormat>
source§fn pixbuf(&self) -> Option<Pixbuf>
fn pixbuf(&self) -> Option<Pixbuf>
source§fn set_size(&self, width: i32, height: i32)
fn set_size(&self, width: i32, height: i32)
source§fn write(&self, buf: &[u8]) -> Result<(), Error>
fn write(&self, buf: &[u8]) -> Result<(), Error>
count
bytes in the given image buffer. Read more