Pixbuf.newFromStreamAtScaleAsync

void newFromStreamAtScaleAsync(gio.input_stream.InputStream stream,  int  width,  int  height,  bool  preserveAspectRatio,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

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

For more details see [gdkpixbuf.pixbuf.Pixbuf.newFromStreamAtScale], 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 [gdkpixbuf.pixbuf.Pixbuf.newFromStreamFinish] to get the result of the operation.

Parameters

`stream`	a [gio.input_stream.InputStream] from which to load the pixbuf
`width`	the width the image should have or -1 to not constrain the width
`height`	the height the image should have or -1 to not constrain the height
`preserveAspectRatio`	`TRUE` to preserve the image's aspect ratio
`cancellable`	optional [gio.cancellable.Cancellable] object, `NULL` to ignore
`callback`	a [gio.types.AsyncReadyCallback] to call when the pixbuf is loaded