c_gdk_pixbuf_new_from_stream_at_scale_async

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GInputStream* stream, int width, int height, int preserveAspectRatio, GCancellable* cancellable, GAsyncReadyCallback callback, void* userData) c_gdk_pixbuf_new_from_stream_at_scale_async;

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