request_data,
                         <a href="ft2-base_interface.html#FT_Face">FT_Face</a>*    aface );

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<p>A callback function provided by client applications. It is used by the cache manager to translate a given <a href="ft2-cache_subsystem.html#FTC_FaceID">FTC_FaceID</a> into a new valid <a href="ft2-base_interface.html#FT_Face">FT_Face</a> object, on demand.</p>
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