Q:
Is Quartz 2D thread safe?
A:
Quartz is thread safe on the whole, but individual Quartz objects are not.
In general, you can operate on any object on any thread as long as you guarantee
that no two threads are operating on the same object simultaneously. The easiest
way to achieve this is to not share your objects between threads.
There are several additional things you need to watch out for:
- If you have multiple
CGContextRefs drawing to the same window or bitmap
context and the content of those CGContextRefs overlaps, then
you will get undefined behavior.
- In the case of multiple
CGPDFContextRefs, trying to draw to different
CGPDFContextRefs that point to the same CGDataConsumerRef doesn't
make sense.
[Feb 25 2003]
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