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I would like to know if the font libraries for PDF or HTML text rendering are binary applications that the main application calls.
For example, to compile an open-source PDF rendering library you need to compile also freetype library. Is this library a collection of binary programs which draw the fonts by the tecnology they consider convenient?
Font libraries are not executable applications, they are just a bunch of data. Basically the font file defines the appearance of each glyph in terms of lines and curves (it is a little more complicated but this is the idea). Freetype is an open source executable library that is capable of parsing the font files and then render text on a graphics surface using the parsed font data.