public/ README The header files in this directory are the only ones that should ever be included by an embedder of PDFium. If there arises a need for functionality beyond what is present here, then a new API must be added here to provide it. These header files must be entirely contained in this directory; they must never include other header files from outside of it. These files must compile cleanly without warnings on both C and C++ compilers. Changes to these files must be carefully considered to avoid breaking compatibility.