On 11/8/18 8:57 AM, nospam wrote:
In article , Snit
wrote:
one key difference not listed was arbitrary regions, allowing for
overlapping windows. xerox thought it was too difficult to do. bill
atkinson thought xerox actually had done it, so he went off and did it,
not realizing it hadn't been done. xerox was stunned when they saw mac
os with regions. he tells the story better than i do.
I have read it... and I allude to it briefly with the "self-redrawing
windows (and double buffering)" item... but I admit that could be more
clear. 
i have heard it firsthand, and what you're calling self-redrawing
windows is not the same as arbitrary regions.
Fair enough. I may have things worded poorly, too. Here is where I got
that info:
http://arstechnica.com/old/content/2005/05/gui.ars
-----
One critical advance from the Lisa team came from an Apple
engineer who was not a former PARC employee, but had seen the
demonstration of Smalltalk. He thought he had witnessed the
Alto's ability to redraw portions of obscured windows when a
topmost window was moved: this was called "regions". In fact,
the Alto did not have this ability, but merely redrew the
entire window when the user selected it.
-----
Aqua introduced the idea of a GUI where every window was
double-buffered in memory, so that any redraws happen
off-screen and aren't visible
-----
Actual quotes shown there are on page 4 and 7.
aqua is os x, long after quickdraw in classic mac os, and very
different in all sorts of ways.
Right... the Aqua comment is about double-buffering to speed the process
and leads to less tearing and the like.
classic mac os actually didn't have double-buffered windows initially,
although some games implemented it on their own and offscreen drawing
was added later.
--
Personal attacks from those who troll show their own insecurity. They
cannot use reason to show the message to be wrong so they try to feel
somehow superior by attacking the messenger.
They cling to their attacks and ignore the message time and time again.
https://youtu.be/H4NW-Cqh308