You can pass this constant to the function ATSUBreakLine to indicate that ATSUBreakLine should use the line width previously set for that line to calculate the soft line break. If no line width has been set for the line, ATSUBreakLine will use the line width set for the text layout object.
enum {
kATSUUseLineControlWidth = 0x7FFFFFFFL
};
Constant description
kATSUUseLineControlWidth
Indicates that ATSUBreakLine should use the previously set line width attribute for the current line to determine how many characters can fit on the line. If no line width has been set for the line, ATSUBreakLine will use the line width set for the text layout object; if not set, ATSUBreakLine uses the default line width value.
