public int getUnscaledWidth() {
    return unscaledWidth;
  }
Returns a map of image asset id to {@link LottieImageAsset}. These assets contain image metadata exported
from After Effects or other design tool. The resulting Bitmaps can be set directly on the image asset so
they can be loaded once and reused across compositions.

If the context dp scale has changed since the last time images were retrieved, images will be rescaled.
lottie/src/main/java/com/airbnb/lottie/LottieComposition.java