c_gdk_pixbuf_get_from_window

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)
GdkPixbuf* function(GdkWindow* window, gint srcX, gint srcY, gint width, gint height) c_gdk_pixbuf_get_from_window;

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