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Re: problems with 1.1 output records under incremental redisplay



On Mon, 14 Feb 1994, Daniel D Suthers wrote:

> CLIM 1.1, Lucid 4.something
> 
> We are experiencing a number of problems with incremental redisplay,
> some of which are tempting us to rewrite functionality which the CLIM
> bill of sale says we were supposed to get.  Could Lucid please check
> these against your record of known bugs & patches and send us any
> relevant patches.
> 
> ----------------------------------------------------------------------
> Improper redisplay of overlapping or "linked" output records:
> 
> Context: graphical output records that overlap or link, for example: 
> 
>          ---------------                 --------------------
>          | A           |                 | B                |
>          |   -----     |                 |   ----------     |
>          |   | C |     |--------L--------|   | D      |     |
>          |   -----     |                 |   ----------     |
>          ---------------                 --------------------
> 
> (There are 5 presentations, one for each of A, B, C, D, and L. L is a
> line that links the outer boxes.)
> 
> Problem: If we move one of the boxes (A or B), the other box is not
> updated and its contents are not visible. For example, if you move A,
> then D disappears; if you then move B, D will reappear but C will
> disappear! This only happens when another output record, L, overlaps
> them. We get similar problems with two boxes that overlap at a corner.
> 
> This problem did not occur before we started using incremental
> redisplay. (Same for everything below.)
> 

Same thing happened to me.  The individual output records are sorted in
coordinate order.  The drawing order is not preserved, so when redrawing
occurs the occlusion stack is fouled up.
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