Android Open Source - android-plotter Spf

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License

The source code is released under:

Apache License

Java Source Code

package org.solovyev.android.plotter;
/*  w  w  w.  j a  va2 s .  c  o m*/
import android.util.Log;

import javax.annotation.Nonnull;
import java.util.concurrent.TimeUnit;

import static java.lang.System.nanoTime;

/**
 * Seconds per frame
 */
final class Spf {

  @Nonnull
  private static final String TAG = Plot.getTag("SPF");

  private static final long SECOND = TimeUnit.SECONDS.toNanos(1);
  private static final long MILLIS = TimeUnit.MILLISECONDS.toNanos(1);
  private long start = 0;
  private long end = 0;
  private int frames = 0;

  public final void logFrameStart() {
    if (end != 0) {
      if (nanoTime() - end >= 100L * MILLIS) {
        // too long pause between frames, probably we are not drawing
        frames = 0;
      }
    }

    if (frames == 0) {
      start = nanoTime();
    }
    frames++;
  }

  public void logFrameEnd() {
    end = nanoTime();
    final long elapsedNanos = end - start;
    if (elapsedNanos >= SECOND) {
      final long elapsedMillis = elapsedNanos / MILLIS;
      final long spf = elapsedMillis / frames;
      Log.d(TAG, "SPF=" + spf + "ms, FPS=" + (1000L / spf));
      frames = 0;
    }
  }
}

Java Source Code List

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