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/renderthread/RenderThread.cpp

diff --git a/libs/hwui/renderthread/RenderThread.cpp b/libs/hwui/renderthread/RenderThread.cpp
index eca7d88..41cb8fd 100644
--- a/libs/hwui/renderthread/RenderThread.cpp
+++ b/libs/hwui/renderthread/RenderThread.cpp
@@ -60,8 +60,10 @@
 
 class DisplayEventReceiverWrapper : public VsyncSource {
 public:
-    DisplayEventReceiverWrapper(std::unique_ptr<DisplayEventReceiver>&& receiver)
-            : mDisplayEventReceiver(std::move(receiver)) {}
+    DisplayEventReceiverWrapper(std::unique_ptr<DisplayEventReceiver>&& receiver,
+            const std::function<void()>& onDisplayConfigChanged)
+            : mDisplayEventReceiver(std::move(receiver))
+            , mOnDisplayConfigChanged(onDisplayConfigChanged) {}
 
     virtual void requestNextVsync() override {
         status_t status = mDisplayEventReceiver->requestNextVsync();
@@ -79,6 +81,9 @@
                     case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
                         latest = ev.header.timestamp;
                         break;
+                    case DisplayEventReceiver::DISPLAY_EVENT_CONFIG_CHANGED:
+                        mOnDisplayConfigChanged();
+                        break;
                 }
             }
         }
@@ -90,6 +95,7 @@
 
 private:
     std::unique_ptr<DisplayEventReceiver> mDisplayEventReceiver;
+    std::function<void()> mOnDisplayConfigChanged;
 };
 
 class DummyVsyncSource : public VsyncSource {
@@ -160,22 +166,29 @@
         // Register the FD
         mLooper->addFd(receiver->getFd(), 0, Looper::EVENT_INPUT,
                        RenderThread::displayEventReceiverCallback, this);
-        mVsyncSource = new DisplayEventReceiverWrapper(std::move(receiver));
+        mVsyncSource = new DisplayEventReceiverWrapper(std::move(receiver), [this] {
+            DeviceInfo::get()->onDisplayConfigChanged();
+            setupFrameInterval();
+        });
     } else {
         mVsyncSource = new DummyVsyncSource(this);
     }
 }
 
 void RenderThread::initThreadLocals() {
-    mDisplayInfo = DeviceInfo::get()->displayInfo();
-    nsecs_t frameIntervalNanos = static_cast<nsecs_t>(1000000000 / mDisplayInfo.fps);
-    mTimeLord.setFrameInterval(frameIntervalNanos);
-    mDispatchFrameDelay = static_cast<nsecs_t>(frameIntervalNanos * .25f);
+    setupFrameInterval();
     initializeDisplayEventReceiver();
     mEglManager = new EglManager();
     mRenderState = new RenderState(*this);
     mVkManager = new VulkanManager();
-    mCacheManager = new CacheManager(mDisplayInfo);
+    mCacheManager = new CacheManager(DeviceInfo::get()->displayInfo());
+}
+
+void RenderThread::setupFrameInterval() {
+    auto& displayInfo = DeviceInfo::get()->displayInfo();
+    nsecs_t frameIntervalNanos = static_cast<nsecs_t>(1000000000 / displayInfo.fps);
+    mTimeLord.setFrameInterval(frameIntervalNanos);
+    mDispatchFrameDelay = static_cast<nsecs_t>(frameIntervalNanos * .25f);
 }
 
 void RenderThread::requireGlContext() {