Idea for underlining in GD text functions

I've had a need to draw underlines in text created with the GD image functions, specifically ImagePSText(). As far as I could tell there's no way to do this (apart from using ImageLine(), which would be difficult to really get right). [I'm happy to hear suggestions if I've missed the obvious :-)] An added complication of what I wanted to achieve was to underline only part of the string being drawn, while maintaining kerning between characters. The system I've come up with is to embed "control sequences" into the string that is passed to ImagePSText(). A control sequence contains commands which change various characteristics of the output, for instance, toggle underlining. I'm currently using the escape character (chr(27)) to indicate the start of a control sequence, and a semi-colon to end the sequence. For example: $str="Some text with an " . chr(27) . "u;underlined" . chr(27) . "u; word"; I've attached a patch for gd.c which does what I'm talking about. I wondering whether people think this is a good way to go, and if so if I should commit this code? If it's not a good idea, any suggestions for drawing underlines? Thanks, Tim

Attachment: [text/x-diff] imagepstext-control-seq.20041106.diff