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Re: lynx-dev LYNX: cursor showing strangely on screen in newest version


From: dickey
Subject: Re: lynx-dev LYNX: cursor showing strangely on screen in newest version
Date: Thu, 7 Jan 1999 22:40:46 -0500 (EST)

> 
> > curses, and the new against slang.  Slang doesn't work properly for 
> > terminals that do not support "back color erase" (bce).  Curses (and 
>  
> Both terminal and terminal emulator support "back color erase", but 
> I notice it's not in my description.  Can you give a good description, 
> both for terminfo and termcap, for bce off the top of your head?  Thanks. 

terminals that support back color erase let you set the screen background
color, then perform an erase - the whole background gets colored.  That's
the most restrictive definition.  It seems logical (and some terminal
emulators such as Linux console and XFree86 xterm) also implement this
feature for the line-clearing operations.  Slang doesn't accommodate
terminals that do _not_ do this by painting the background.  So it remains
whatever color the terminal actually did paint things.  (Though it's more
efficient, most hardware terminals afaik do _not_ implement bce).
  
> > ncurses) do.  You can test your terminal's bce capability by running the 
> > vttest program from my ftp area (not the one that's already on netcom, 
>  
> BTW, how does one "run the vttest program."  I downloaded it a while back, 
> but was never sure what I should do with it. 
just like lynx: configure and make.

Then run vttest (preferably on a 24x80 screen).  It can accommodate other
screen sizes via command-line (that's in a readne), e.g,.

        vttest 25x80.80

forces it to fit on a 25x80 screen with the 132-column stuff mapped into
80 columns (not all "vt100" emulators can do 132-columns, and it's useful
to be able to turn that off).

The program gives a menu - entries are selected by typing the number.
(A '*' runs all of the tests at that level).

Menu 11 has a submenu 2, which is "ANSI" color tests.  Some of those exercise
the bce color model (and demonstrate whether your terminal is reasonably
compatible with that model as I've interpreted it -- there's no
absolute standards here unfortunately, but various compatibility issues
I've picked up details).  

-- offhand, _I_ think the only ones that are hard to interpret if you don't
   know a lot about VTxxx terminals are the font screens.  (Well, I know
   what they mean...)

> __Henry 
>  
> PS No "welcome back"s, because I'm not.  lynx-dev backlog at about 500KB+. 


-- 
Thomas E. Dickey
address@hidden
http://www.clark.net/pub/dickey

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