commit 4d0d81aec2667cf4dc82971ee42c29c1ec1aeb13
author jvanverth <jvanverth@google.com> Tue Aug 11 11:07:07 2015 -0700
committer Commit bot <commit-bot@chromium.org> Tue Aug 11 11:07:07 2015 -0700
tree 32b4173528ec453acfa83e00c92b1a69e1338fd4
parent 8ee06f21a27bbffaf613a312c6f24bbbb21c650a

Add high resolution WallTimer to SampleApp

Gives better than 1 ms results when timing framerate.

Review URL: https://codereview.chromium.org/1288473002

samplecode/SampleApp.cpp

diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 486feed..5bb223a 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1313,8 +1313,9 @@
     }
 
     // Do this after presentGL and other finishing, rather than in afterChild
-    if (fMeasureFPS && fMeasureFPS_StartTime) {
-        fMeasureFPS_Time += SkTime::GetMSecs() - fMeasureFPS_StartTime;
+    if (fMeasureFPS) {
+        fTimer.end();
+        fMeasureFPS_Time += fTimer.fWall;
     }
 }
 
@@ -1351,9 +1352,8 @@
     }
 
     if (fMeasureFPS) {
-        if (SampleView::SetRepeatDraw(child, FPS_REPEAT_COUNT)) {
-            fMeasureFPS_StartTime = SkTime::GetMSecs();
-        }
+        (void)SampleView::SetRepeatDraw(child, FPS_REPEAT_COUNT);
+        fTimer.start();
     } else {
         (void)SampleView::SetRepeatDraw(child, 1);
     }
@@ -1935,7 +1935,7 @@
     }
 
     if (fMeasureFPS) {
-        title.appendf(" %8.3f ms", fMeasureFPS_Time / (float)FPS_REPEAT_COUNT);
+        title.appendf(" %8.4f ms", fMeasureFPS_Time / (float)FPS_REPEAT_COUNT);
     }
 
     SkView* view = curr_view(this);