"Arnold Reinders" <✉somewhere.com> wrote in message 
news:✉forums.codegear.com...

> It appears to be threadsafe, each thread processing his own index. I
> have tested this code very often. However, very rarely I get a illegal
> memory read/write. Are there things I overlook? Should I read some
> articles (i couldn't find them)?

Technically, nothing about it is thread-safe.  You should always provide a 
lock around multi-threaded access to shared resources.  But as long as 
neither bitmap is ever being resized  or having its underlying handles 
regenerated, in other thread while you are reading the Scanline[property] or 
modifying its contents, then you should be ok.


-- 
Remy Lebeau (TeamB)