PixbufLoader


Object Hierarchy:

Object hierarchy for PixbufLoader

Description:

[ CCode ( type_id = "gdk_pixbuf_loader_get_type ()" ) ]
public class PixbufLoader : Object

Incremental image loader.

`GdkPixbufLoader` 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 `GdkPixbufLoader` to load an image, create a new instance, and call [methodGdkPixbuf.PixbufLoader.write] to send the data to it. When done, [methodGdkPixbuf.PixbufLoader.close] should be called to end the stream and finalize everything.

The loader will emit three important signals throughout the process:

- [signalGdkPixbuf.PixbufLoadersize_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 [methodGdkPixbuf.PixbufLoader.set_size] in response to this signal. - [signalGdkPixbuf.PixbufLoader area_prepared] will be emitted as soon as the pixbuf of the desired has been allocated. You can obtain the `GdkPixbuf` instance by calling [methodGdkPixbuf.PixbufLoader.get_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. - [signal GdkPixbuf.PixbufLoaderarea_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.

typeof (unichar2) typeof (unichar2) Loading an animation

Loading an animation is almost as easy as loading an image. Once the first [signalGdkPixbuf.PixbufLoader area_prepared] signal has been emitted, you can call [method GdkPixbuf.PixbufLoader.get_animation] to get the [classGdkPixbuf.PixbufAnimation] instance, and then call and [method GdkPixbuf.PixbufAnimation.get_iter] to get a [classGdkPixbuf.PixbufAnimationIter] to retrieve the pixbuf for the desired time stamp.


Namespace: Gdk
Package: gdk-pixbuf-2.0

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