XOR support for mouse cursors
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.
>>> -Ben Swartzlander
>> Because It is patented?
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