XOR support for mouse cursors

Russell Sears sears at cs.berkeley.edu
Sat Nov 10 11:30:54 PST 2007

There's also a relevant patent (5,359,347) from 1994.


Ben Swartzlander wrote:
> Are you talking about patent 4,197,590? That one appears to have been 
> issued in 1980. It must have expired 10 years ago!
> -Ben Swartzlander
> Marco wrote:
>> Ben Swartzlander escreveu:
>>> As far as I can tell, X does not support mouse cursors that invert 
>>> the pixels underneath them (like Windows mouse cursors). This causes 
>>> a number of problems. First, it makes it impossible to use a 1-pixel 
>>> wide "I" style cursor for text editing, because the cursor will 
>>> completely disappear over a black background (or a white background, 
>>> if you use a white cursor). The only usable "I" style cursors I've 
>>> seen are 3 pixels wide, such as a black "I" with a white outline to 
>>> prevent it from vanishing. This would not be so bad, but then certain 
>>> applications like rdesktop (and possibly Wine) need to use actual 
>>> Windows cursors, so they convert the Windows cursors bitmap to a 
>>> valid X cursor by discarding most of the data, which in the case of 
>>> the 1-pixel wide "I" cursor is mostly useless.
>>> A apologize if this issue has been discussed before but I want to 
>>> know (1) if there are any extensions or options I can use to fix this 
>>> behavior (2) if not, is there a good reason why X has this limitation 
>>> and (3) what can I do to fix this? I am a long time Windows and Linux 
>>> use and as much as I would like to replace my Windows desktop with 
>>> Linux, the poor mouse cursor support is one issue holding me back. 
>>> I'm willing to code an extension to X if that's what it takes (and 
>>> obviously write the patch for rdesktop) but I'd like to know how 
>>> others have dealt with this problem and if anyone has some suggestions.
>>> thanks,
>>> -Ben Swartzlander
>> Because It is patented?
>> <http://www.google.com/search?q=XOR+cursor+patent&ie=utf-8&oe=utf-8&aq=t&rls=org.debian:pt-BR:unofficial&client=iceweasel-a> 
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