tion. They might as well disappear from memory on the next cache lookup, so don't treat them as persistent data.</p>
<p>The descriptor's &lsquo;buffer&rsquo; field is set to&nbsp;0 to indicate a missing glyph bitmap.</p>
<p>If &lsquo;anode&rsquo; is <i>not</i> NULL, it receives the address of the cache node containing the bitmap, after increasing its reference count. This ensures that the node (as well as the image) will always be kept in the cache until you call <a href="ft2-cache_subsystem.html#FTC_Node