about openoffice PixelFilter?

[jianlizhao <ji...@hotmail.com>]

Hello  my friend

In the file
main\binfilter\bf_svtools\source\filter.vcl\filtersvt_FilterConfigCache.cxx 

Have the following code:
const char*
FilterConfigCache::FilterConfigCacheEntry::InternalPixelFilterNameList[] = 
{ 
IMP_BMP, IMP_GIF, IMP_PNG,IMP_JPEG, IMP_XBM, IMP_XPM, 
EXP_BMP, EXP_JPEG, NULL 
}; 

const char*
FilterConfigCache::FilterConfigCacheEntry::InternalVectorFilterNameList[] = 
{ 
IMP_SVMETAFILE, IMP_WMF, IMP_EMF, IMP_SVSGF, IMP_SVSGV, 
EXP_SVMETAFILE, EXP_WMF, EXP_EMF, EXP_SVG, NULL 
}; 

const char*
FilterConfigCache::FilterConfigCacheEntry::ExternalPixelFilterNameList[] = 
{ 
"egi", "epn", "icd", "ipd", "ipx", "ipb", "epb", "epg", 
"epp", "ira", "era", "itg", "iti", "eti", "exp", NULL 
}; 


my question as below: 
The openoffice division what based InternalPixelFilter or
ExternalPixelFilter? 
I wrote an addon extension used to insert a new type of picture is to belong
InternalPixelFilter or external ExternalPixelFilter?

Thanks...

Best Regards!