tree 6309c40933b8e27199121d283a484aadbb4b336a
parent 167a19d8463f5ab36e21bb7c6ee840842efc7a8e
author Lalit Maganti <lalitm@google.com> 1714088828 +0100
committer Lalit Maganti <lalitm@google.com> 1714088828 +0100

ui: utilise segment forest to improve counter tracks on large traces

This CL introduces the use of the segment forest to significantly speed
up the queries of counter tracks on large traces. Specifically the data
structure is exposed to Typescript via the use of a new "CounterMipmap"
trace processor operator.

Also while I'm here, fix a few subtle issues I found in the rendering
of counter tracks:
1) Don't draw things deep in negative x: this can cause disappearing
   tracks when very very zoomed in
2) Improve perf of counter panels query.
3) Fix some subtle overlap between counter units and the hover line:
   this is pixel peeping but still nice to fix. Specifically, on my
   monitor, I saw the bottom 3/4 pixels overlapping with the top of the
   counter line when the counter was at its maximum.

Change-Id: I603faaccd080f5e5ff07c37462a039e6850803ea