Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!munnari.oz.au!bruce!roddi
From: roddi@bruce.cs.monash.OZ.AU (Roddi Walker)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: quasi WB2.0 BUGS
Message-ID: <3880@bruce.cs.monash.OZ.AU>
Date: 28 Mar 91 04:13:21 GMT
Article-I.D.: bruce.3880
References: <3877@bruce.cs.monash.OZ.AU> <20150@cbmvax.commodore.com>
Distribution: comp.sys.amiga.programmer
Organization: Monash Uni. Computer Science, Australia
Lines: 85

In <20150@cbmvax.commodore.com> jesup@cbmvax.commodore.com (Randell Jesup) writes:

>	What's really going on here is that the mac doesn't allow anything
>to draw into an unexposed window (notice how windows pop to the front when
>you activate them?)  So it doesn't have to save off-screen bitmaps, and doesn't
>have to worry much about clipping rectangles - only visible portions count.
>Also, work has been done on layers to improve performance (and it has been
>improved considerably from earlier 2.0 versions), but the basic algorithms
>required to handle multitasking, (partially) obscured windows have an 
>exponential component in the recalculation of the clipping rectangles.

oh.
hum, all the time CBM is holding the beta and its getting better and better
(and more stable :-)  I WANT IT!  Waahhhh!!

>>	Also, when 2.0 was redrawing the windoes, it would often leave
>>vertical/horizontal 1 pixel wide/thick gaps when redrawing the window
>>borders (the box with the scroll bars) and the little rectangle around the
>>icons within the window.

>	I haven't seen anything like this (if I read it right, it's confusingly
>worded) in any recent version.

Um, it *is* rather tricky to drescribe ... they say a picture is work 1K words
(ie. 2048 bytes, I guess).  So here goes:


        +---------------------+-+
        |    <window 1>       |X|
        |                     |X|
        |          +------------------+-+
        |          |   <window 2>     |X|
        |          |                  |X|  X == scroll bar :-)
        |          |                  |X|
        |          +------------------+-+
        |                     |X|
        +---------------------+-+

after window 2 has been moved/closed whatever:


        +---------------------+-+
        | <window 1>          |X| 
        |                     |X|
        |                     |X|
        |           *          X                <- imagine this gap is 1
        |           *         |X|                  pixel wide
        |           *         |X|
        |                     |X|
        |                     |X|
        +---------------------+-+

sometimes this happens to the rectangles of icons that were under window 2,
except a pixel is missing from both vertical sides of the rectangle, on
the same scan line.

* == random 1 pixel wide junk, where the edge of widow 2 used to be.
*
*

Sometimes this junk can be horizontal, in which case it is 1 pixel high.

Ah well, these bugs are probably fixed in the current beta anyways ...

>-- 
>Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
>{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com  BIX: rjesup  
>Thus spake the Master Ninjei: "To program a million-line operating system
>is easy, to change a man's temperament is more difficult."
>(From "The Zen of Programming")  ;-)

 ^^^ not as cool as your previous sig(the one about the compiler :-)
 which is the second coolest sig I have ever seen (the coolest was:
Jesus saves ... but Gretzky catches the rebound ... he shoots ...
he SCOORES! (yes, I know Gretzky is a hokey player, but I'm not into
basket ball)).

How about:

The Sun rises over my source code,
I am at peace ;-)


Roddi