[poppler] MemoryPNGWriter

[Daniele Depetrini]

Hi All,

For a project, I needed to modify the PNGWriter class to write the PNG 
in memory and not in a file so I took the original PNGWriter classes and 
did needed modifications (extending the class as is was not good enough 
because of private members not accessible).

Will be nice to have a "unified" class capable to do both in memory and 
file export, but some change are needed in the base class "ImgWriter" 
too to have a clean implementation.

Attaching source in case someone like to have a took to it.

Cheers,

Daniele.


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