[poppler] Generic PNM support

[Albert Astals Cid]

A Dijous, 30 de desembre de 2010, Pino Toscano va escriure:
> Hi,
> 
> currently, there's only SplashBitmap able to export to PBM/PGM/PPM.
> I just created a PNMWriter to provide generic export capabilities, even
> when not using Splash(Bitmap) directly.
> References:
> - PBM: http://netpbm.sourceforge.net/doc/pbm.html
> - PGM: http://netpbm.sourceforge.net/doc/pgm.html
> - PPM: http://netpbm.sourceforge.net/doc/ppm.html
> 
> Attached there's a small patch for pdftoppm to use the new export
> filter, instead of the own SplashBitmap PNM exporting method.

What's the benefit of this over the existing code?

Albert