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I was able to get it to build, but it was a lot of work. The source code was out of date with the current firmware versions, and one of the necessary libraries wasn't on the devices anymore (libpbframework.so). After I got it working (added library to device, and library and header files to the build environment), and upgraded to a newer version of poppler, I played with the font rendering hints but never noticed any difference in the output. I was probably changing stuff in poppler/splash that was never used in the program. So given my lack of success and the fact that a different source version was actually being used on the devices, I gave up.
If you like, I could zip up what I have and make it available to you, but it's in a state of hackiness, and I can't even remember what I did to make it all work. I vaguely recall using Sergey's build environment for the last step rather than cmake, but I could be wrong.
As far as swapping out the rendering engine, if you look at the source code, you'll see that that would be a massive undertaking. I think you'd be better off starting a new application from scratch. At least that way, you won't have to mess with pbframework anymore.
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