LibPoppler's primary OutputDev subclass is an adaptor to its vendored "Splash" vector graphics library. I'll discuss Splash itself someday very soon.
It tracks which colour mode to use, row padding, paper colour, screen parameters, the document & its XRef, a Splash instance, bitmap, font engine, T3 font cache & stack, current font, clip path, transparancy group, & plenty of flags.
With the aid of some additional Splash "patterns" the implementation includes:
