public Typeface getTypeface(Font font) {
    tempPair.set(font.getFamily(), font.getStyle());
    Typeface typeface = fontMap.get(tempPair);
    if (typeface != null) {
      return typeface;
    }
    Typeface typefaceWithDefaultStyle = getFontFamily(font);
    typeface = typefaceForStyle(typefaceWithDefaultStyle, font.getStyle());
    fontMap.put(tempPair, typeface);
    return typeface;
  }
Sets the default file extension (include the `.`).
<p>
e.g. `.ttf` `.otf`
<p>
Defaults to `.ttf`
lottie/src/main/java/com/airbnb/lottie/manager/FontAssetManager.java