question: public int nextFontRunIndex ( CodePointIterator iter ) { int cp = iter . next ( ) ; int fontIndex = 1 ; if ( cp != CodePointIterator . DONE ) { fontIndex = getFontIndex ( cp ) ; while ( ( cp = iter . next ( ) ) != CodePointIterator . DONE ) { if ( getFontIndex ( cp ) != fontIndex ) { iter . prev ( ) ; break ; } } } return fontIndex ; }
target:  Determines the font index for the code point at the current position in the iterator, then advances the iterator to the first code point that has a different index or until the iterator is DONE, and returns the font index.