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Make sure you have the same path to the binaries you want to profile on your target device as your workstation.

On your profiling target as root:

export KREXP=dpkg -L kernel-debug | grep "vmlinux-2.6"
opcontrol --init
opcontrol --vmlinux=$KREXP
opcontrol --separate=kernel
opcontrol --status
opcontrol -c=8

start your application

as root again:

opcontrol --stop;  opcontrol --reset; opcontrol --start; sleep 5; opcontrol --stop

commence activity you want to profile - i.e. scroll around wildly, play a video, etc

on your workstation/host environment:
rm -rf /var/lib/oprofile && scp -r root@ /var/lib/
this should give you some log info:
opreport -l -r

to finally generate the fancy svg:
opreport -c /path/to/binary_to_profile > /tmp/opreport.txt
oprofile-callgraph-to-svg -e 1 -n 1 /tmp/opreport.txt

your result should look like this

Iterate a nsIntRegion

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A quick one liner to iterate a nsIntRegion:

for(nsIntRegionRectIterator iter(mUpdateRegion); const nsIntRect* R=iter.Next();)
//do something with R