public static CharacterPositionInfo FromCharIndex(IntPtr ssa_struct, int char_index, CharacterPositionType pos_type)
{
if ((pos_type == CharacterPositionType.AfterEnd) ||
(pos_type == CharacterPositionType.BeforeBeginning) ||
(pos_type == CharacterPositionType.ClusterPart))
{
throw new ArgumentException("Illegal parameter.", "pos_type");
}
var trailing = (pos_type == CharacterPositionType.TrailingEdge);
var x_offset = 0;
var res = NativeScript.ScriptStringCPtoX
(ssa_struct,
char_index,
trailing,
ref x_offset);
if (res != NativeScript.S_OK)
{
Marshal.ThrowExceptionForHR(res);
}
var ret = new CharacterPositionInfo();
ret.CharIndex = char_index;
ret.PositionType = pos_type;
ret.Xoffset = x_offset;
return(ret);
}
