@Override
    public boolean equals(@Nullable Object o) {
      if (o == this) {
        return true;
      }
      if (o instanceof FrameKey) {
        FrameKey that = (FrameKey) o;
        return this.mFrameIndex == that.mFrameIndex
            && this.mImageCacheKey.equals(that.mImageCacheKey);
      }
      return false;
    }
Facade to the image memory cache for frames of an animated image.

<p>Each animated image should have its own instance of this class.
animated-base/src/main/java/com/facebook/imagepipeline/animated/impl/AnimatedFrameCache.java