[PATCH i-g-t 1/9] trace.pl: Improve time axis labels

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

It is possible to customize the axis display so change it to display
timestamps in seconds on the major axis (with six decimal spaces) and
relative millisecond offsets on the minor axis.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: John Harrison <John.C.Harrison@Intel.com>
---
 scripts/trace.pl | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/scripts/trace.pl b/scripts/trace.pl
index fc1713e4f9a7..89491125490d 100755
--- a/scripts/trace.pl
+++ b/scripts/trace.pl
@@ -1000,6 +1000,37 @@ $first_ts = ts($first_ts);
 print <<ENDHTML;
   ]);
 
+  var last_major_ms;
+
+  function majorAxis(date, scale, step) {
+	var s = date / 1000;
+
+	last_major_ms = date;
+
+	if (scale == 'millisecond')
+		return s.toFixed(6) + "s";
+	else if (scale == 'second')
+		return s.toFixed(3) + "s";
+	else
+		return s.toFixed(0) + "s";
+  }
+
+  function minorAxis(date, scale, step) {
+	var ms = date;
+
+	ms -= last_major_ms;
+
+	if (ms < 0)
+		return '';
+
+	if (scale == 'millisecond')
+		return "+" + ms.toFixed(3) + "ms";
+	else if (scale == 'second')
+		return ms.toFixed(3) + "s";
+	else
+		return ms.toFixed(0) + "s";
+  }
+
   // Configuration for the Timeline
   var options = { groupOrder: 'content',
 		  horizontalScroll: true,
@@ -1007,6 +1038,7 @@ print <<ENDHTML;
 		  stackSubgroups: false,
 		  zoomKey: 'ctrlKey',
 		  orientation: 'top',
+		  format: { majorLabels: majorAxis, minorLabels: minorAxis },
 		  start: '$first_ts',
 		  end: '$end_ts'};
 
-- 
2.17.1

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