diff options
Diffstat (limited to 'core/java/android')
| -rw-r--r-- | core/java/android/view/ViewRootImpl.java | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java index 7eae739..081e267 100644 --- a/core/java/android/view/ViewRootImpl.java +++ b/core/java/android/view/ViewRootImpl.java @@ -108,6 +108,7 @@ public final class ViewRootImpl extends Handler implements ViewParent, private static final boolean DEBUG_TRACKBALL = false || LOCAL_LOGV; private static final boolean DEBUG_IMF = false || LOCAL_LOGV; private static final boolean DEBUG_CONFIGURATION = false || LOCAL_LOGV; + private static final boolean DEBUG_FPS = false; private static final boolean WATCH_POINTER = false; /** @@ -274,6 +275,11 @@ public final class ViewRootImpl extends Handler implements ViewParent, private Thread mRenderProfiler; private volatile boolean mRenderProfilingEnabled; + // Variables to track frames per second, enabled via DEBUG_FPS flag + private long mFpsStartTime = -1; + private long mFpsPrevTime = -1; + private int mFpsNumFrames; + /** * see {@link #playSoundEffect(int)} */ @@ -1766,12 +1772,42 @@ public final class ViewRootImpl extends Handler implements ViewParent, } } + /** + * Called from draw() when DEBUG_FPS is enabled + */ + private void trackFPS() { + // Tracks frames per second drawn. First value in a series of draws may be bogus + // because it down not account for the intervening idle time + long nowTime = System.currentTimeMillis(); + if (mFpsStartTime < 0) { + mFpsStartTime = mFpsPrevTime = nowTime; + mFpsNumFrames = 0; + } else { + ++mFpsNumFrames; + String thisHash = Integer.toHexString(System.identityHashCode(this)); + long frameTime = nowTime - mFpsPrevTime; + long totalTime = nowTime - mFpsStartTime; + Log.v(TAG, "0x" + thisHash + "\tFrame time:\t" + frameTime); + mFpsPrevTime = nowTime; + if (totalTime > 1000) { + float fps = (float) mFpsNumFrames * 1000 / totalTime; + Log.v(TAG, "0x" + thisHash + "\tFPS:\t" + fps); + mFpsStartTime = nowTime; + mFpsNumFrames = 0; + } + } + } + private void draw(boolean fullRedrawNeeded) { Surface surface = mSurface; if (surface == null || !surface.isValid()) { return; } + if (DEBUG_FPS) { + trackFPS(); + } + if (!sFirstDrawComplete) { synchronized (sFirstDrawHandlers) { sFirstDrawComplete = true; |