private boolean loadChar (int c, int flags) {
        return face.loadChar(c, flags);
    }
Creates a new generator from the given font file. Uses {@link FileHandle#length()} to determine the file size. If the file
length could not be determined (it was 0), an extra copy of the font bytes is performed. Throws a
{@link GdxRuntimeException} if loading did not succeed.
core/src/com/badlogic/gdx/graphics/g2d/freetype/FreeTypeFontGenerator.java