It supports the following patch types:
- ASM (SNES)
BPS
BSDIFF
DLDI
DPS
IPS
IPS32 (same as IPS but with messily hacked in 32 bit pointers)
PPF
UPS
XDELTA1
XDELTA3
For those of you who care, the app is fully open source: https://github.com/xperia64/android-rom-patcher
Also, it is the first open source implementation of IPS32 AFAIK.