commit cf185f5b0d30516ecb34350a585aed7f7d4e0672
author John Reck <jreck@google.com> Thu Apr 11 16:11:24 2019 -0700
committer John Reck <jreck@google.com> Thu Apr 18 14:20:56 2019 -0700
tree 4235b69aa096175a3e01db7ea62e7c1bcab30603
parent c4a3f5c3777da82d6f452d26f684a65e97ed963c

Dynamically adjust renderahead

Tracks refresh rate changes and adjusts renderahead
based off of the active refresh rate.

Default is 60hz = 0 render ahead & > 70hz is render ahead 1

Bug: 127822449
Test: systraced stuff

Change-Id: I9849aa065262f21f7602d44cd1761373279dc28d

libs/hwui/Properties.cpp

diff --git a/libs/hwui/Properties.cpp b/libs/hwui/Properties.cpp
index 9998854..19f509c 100644
--- a/libs/hwui/Properties.cpp
+++ b/libs/hwui/Properties.cpp
@@ -67,7 +67,7 @@
 bool Properties::isolatedProcess = false;
 
 int Properties::contextPriority = 0;
-uint32_t Properties::defaultRenderAhead = 0;
+int Properties::defaultRenderAhead = -1;
 
 static int property_get_int(const char* key, int defaultValue) {
     char buf[PROPERTY_VALUE_MAX] = {
@@ -130,9 +130,8 @@
 
     enableForceDarkSupport = property_get_bool(PROPERTY_ENABLE_FORCE_DARK, true);
 
-    defaultRenderAhead =
-            std::max(0u, std::min(2u, static_cast<uint32_t>(property_get_int(
-                                              PROPERTY_RENDERAHEAD, render_ahead().value_or(0)))));
+    defaultRenderAhead = std::max(-1, std::min(2, property_get_int(PROPERTY_RENDERAHEAD,
+            render_ahead().value_or(0))));
 
     return (prevDebugLayersUpdates != debugLayersUpdates) || (prevDebugOverdraw != debugOverdraw);
 }