[poppler] splash output improvement

[Carlos Fangmeier]

Hi, I'm using the evince pdf reader, who use the poppler lib to do the 
render. I notice that the render of poppler ( using the splash output )  
is much slower than xdf. Maybe runing evince on a desktop pc isn'tt a 
big deal, but runing evince on a Zaurus C860 is to slow.
Using valgrind-cachegrind on my pc I find out that most of the cpu used 
for rendering a pdf, was spend in the constructor 
SplashScreen::SplashScreen  ( almost 38% ), so I decided to do some 
litle improvement. After my changes the cpu spend on this constructor 
dropped to 0.1%. With this improvement the evince response was much 
better than before.
Attachedt to this mail is the patch with my changes, maybe they aren't 
100% acording with your develope, but it could  be a good idea. 
Basically I implemented a cache for all possible threshold matrix.

Best regards


Carlos Fangmeier


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