gdkpixbuf.pixbuf_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
[gdkpixbuf.pixbuf.Pixbuf.newFromFile] or [gdkpixbuf.pixbuf_animation.PixbufAnimation.newFromFile]
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.
The loader will emit three important signals throughout the process:
signal@GdkPixbuf.PixbufLoader::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 gdkpixbuf.pixbuf_loader.PixbufLoader.setSize in
response to this signal.
signal@GdkPixbuf.PixbufLoader::area-prepared will be emitted as
soon as the pixbuf of the desired has been allocated. You can obtain
the gdkpixbuf.pixbuf.Pixbuf instance by calling gdkpixbuf.pixbuf_loader.PixbufLoader.getPixbuf.
If you want to use it, simply acquire a reference to it. You can
also call [gdkpixbuf.pixbuf_loader.PixbufLoader.getPixbuf] later to get the same
pixbuf.
signal@GdkPixbuf.PixbufLoader::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.
Incremental image loader.
gdkpixbuf.pixbuf_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 [gdkpixbuf.pixbuf.Pixbuf.newFromFile] or [gdkpixbuf.pixbuf_animation.PixbufAnimation.newFromFile] 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 gdkpixbuf.pixbuf_loader.PixbufLoader to load an image, create a new instance, and call gdkpixbuf.pixbuf_loader.PixbufLoader.write to send the data to it. When done, gdkpixbuf.pixbuf_loader.PixbufLoader.close should be called to end the stream and finalize everything.
The loader will emit three important signals throughout the process:
Loading an animation
Loading an animation is almost as easy as loading an image. Once the first signal@GdkPixbuf.PixbufLoader::area-prepared signal has been emitted, you can call gdkpixbuf.pixbuf_loader.PixbufLoader.getAnimation to get the gdkpixbuf.pixbuf_animation.PixbufAnimation instance, and then call and gdkpixbuf.pixbuf_animation.PixbufAnimation.getIter to get a gdkpixbuf.pixbuf_animation_iter.PixbufAnimationIter to retrieve the pixbuf for the desired time stamp.