How to get the all the raw touch points at a particular instant for a tap?

How to get the all the raw touch points at a particular instant for a tap?

When the touchscreen is tapped once, the finger touches multiple x,y
positions on the screen by virtue of the finger being fat. But android
only gives me one x,y position at a time (For example, if I use adb shell
getevent, it gives me only one x-y coordinate at a time. Of course for a
tap it gives multiple x,y positions since the tap lasts for some time and
it gives the x-y position for each fraction of that time if x-y slightly
changes.) At each instant there are more than 50-100 pixels that I am
touching - presumably android uses some algorithm to reduce all the touch
signals into one x-y position. Is there a way I can get those multiple raw
touch signals at every pixel I am touching at the same time? I have a
rooted device and am willing to delve into android source code if
required.