I am in Ch 4 of Petzolds book of PM programming and have a couple of
questions regarding repaint of invalid rectangles.
 
The first is concerning PMs ability to consolodate WM_PAINT messages
and the related invalidated rectangles inside the message queue.
Would a paint message get posted if an identical message w/ identical
rectangle corrdinates was already in the queue?
 
Also, would a pending paint message get deleted/replaced if another
message were posted with a larger rectangle that completely encompasses
an invalid rectangle inside the queue to the same client window?
 
After thinking this over a bit, my guess is that regardless of what
was already in the queue, new WM_PAINT messages are always posted.
This would reduce PM complexity.  The client would recieve all paint
messages, even if there were duplicates.
 
The last question I have is concerning the effort to check the queue
for duplicate paint messages, or for rectangles that encompass smaller
invalid regions attached to exitsing paint messages.
 
Another possible way of minimizing repaints would be to SEND a user
message to the client procedure that says "the entire window is going
to need repainted soon" with the client ignoring all WM_PAINTS until
the promised message arrives.  Again, is this paint minimizing worth
the effort?
 
thx,
John
 


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