c_gdk_pixbuf_save_to_bufferv

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)
gboolean function(GdkPixbuf* pixbuf, gchar** buffer, gsize* bufferSize, char* type, char** optionKeys, char** optionValues, GError** error) c_gdk_pixbuf_save_to_bufferv;

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