I've got a difficult drawing bug that I am trying to track down. I know what is going on - during the draw routine, the region returned by GetPortVisibleRegion is wrong. I believe it is because someone has done something to cause SetPortVisibleRegion to be called with the bad region. I cannot just search for all of the calls to SetPortVisibleRegion, because it can be called by various OS calls, like BeginUpdate.
It is easy to setup Instruments to show me all of the times that SetPortVisibleRegion is called
- Select Instrument->Trace Symbol
- Enter SetPortVisibleRegion into the field and press OK
However, it would be even more useful if I could see the bounds of the region being passed in. I am certain this is possible, but I don't know how to do it.
Anyone know?
p.s. if there are any other calls that people are aware of that would affect the region returned by GetPortVisibleRegion, I would be interested in that as well.
Thank you.