1 files changed, 46 insertions, 0 deletions
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index d4c4b1f..9c04d59 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -38,6 +38,7 @@
 #include "Layer.h"
 #include "SurfaceFlinger.h"
 #include "SurfaceTextureLayer.h"
+#include <math.h>
 
 #define DEBUG_RESIZE    0
 
@@ -54,6 +55,8 @@ Layer::Layer(SurfaceFlinger* flinger,
         mCurrentTransform(0),
         mCurrentScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
         mCurrentOpacity(true),
+        mFrameLatencyNeeded(false),
+        mFrameLatencyOffset(0),
         mFormat(PIXEL_FORMAT_NONE),
         mGLExtensions(GLExtensions::getInstance()),
         mOpaqueLayer(true),
@@ -65,6 +68,17 @@ Layer::Layer(SurfaceFlinger* flinger,
     glGenTextures(1, &mTextureName);
 }
 
+void Layer::onLayerDisplayed() {
+    if (mFrameLatencyNeeded) {
+        const DisplayHardware& hw(graphicPlane(0).displayHardware());
+        mFrameStats[mFrameLatencyOffset].timestamp = mSurfaceTexture->getTimestamp();
+        mFrameStats[mFrameLatencyOffset].set = systemTime();
+        mFrameStats[mFrameLatencyOffset].vsync = hw.getRefreshTimestamp();
+        mFrameLatencyOffset = (mFrameLatencyOffset + 1) % 128;
+        mFrameLatencyNeeded = false;
+    }
+}
+
 void Layer::onFirstRef()
 {
     LayerBaseClient::onFirstRef();
@@ -83,7 +97,12 @@ void Layer::onFirstRef()
     mSurfaceTexture = new SurfaceTextureLayer(mTextureName, this);
     mSurfaceTexture->setFrameAvailableListener(new FrameQueuedListener(this));
     mSurfaceTexture->setSynchronousMode(true);
+#ifdef USE_TRIPLE_BUFFERING
+#warning "using triple buffering"
+    mSurfaceTexture->setBufferCountServer(3);
+#else
     mSurfaceTexture->setBufferCountServer(2);
+#endif
 }
 
 Layer::~Layer()
@@ -408,6 +427,7 @@ void Layer::lockPageFlip(bool& recomputeVisibleRegions)
 
         // update the active buffer
         mActiveBuffer = mSurfaceTexture->getCurrentBuffer();
+        mFrameLatencyNeeded = true;
 
         const Rect crop(mSurfaceTexture->getCurrentCrop());
         const uint32_t transform(mSurfaceTexture->getCurrentTransform());
@@ -543,6 +563,32 @@ void Layer::dump(String8& result, char* buffer, size_t SIZE) const
     }
 }
 
+void Layer::dumpStats(String8& result, char* buffer, size_t SIZE) const
+{
+    LayerBaseClient::dumpStats(result, buffer, SIZE);
+    const size_t o = mFrameLatencyOffset;
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const nsecs_t period = hw.getRefreshPeriod();
+    result.appendFormat("%lld\n", period);
+    for (size_t i=0 ; i<128 ; i++) {
+        const size_t index = (o+i) % 128;
+        const nsecs_t time_app   = mFrameStats[index].timestamp;
+        const nsecs_t time_set   = mFrameStats[index].set;
+        const nsecs_t time_vsync = mFrameStats[index].vsync;
+        result.appendFormat("%lld\t%lld\t%lld\n",
+                time_app,
+                time_vsync,
+                time_set);
+    }
+    result.append("\n");
+}
+
+void Layer::clearStats()
+{
+    LayerBaseClient::clearStats();
+    memset(mFrameStats, 0, sizeof(mFrameStats));
+}
+
 uint32_t Layer::getEffectiveUsage(uint32_t usage) const
 {
     // TODO: should we do something special if mSecure is set?