xf86PostMotionEvent: Need information/documentation

[Manuel Reimer]

Can someone please at least tell me where I have to ask if I need 
developer information about xorg?

Thank you very much in advance

CU

Manuel

Manuel Reimer wrote:
> Hello,
> 
> I'm modifying a driver for xorg. Currently I have the following problem:
> 
> I want to move the cursor using relative values. My values have X=0 and 
> Y=0 as "centre" (means "no movement"). To move the cursor, the following 
> is assumed:
> 
> X > 0 --> move right
> Y > 0 --> move down
> X < 0 --> move left
> Y < 0 --> move up
> 
> My problem is that it's nearly impossible to move slowly into the down 
> right corner. If I try to move the cursor really slow down right then it 
> "wiggles" and sometimes it even moves slowly left up :-/
> 
> The problem seems to be solved immediately if I change my code from:
> 
> xf86PostMotionEvent(device, 1, 0, 2, x, y)
> 
> to
> 
> xf86PostMotionEvent(device, 1, 0, 2, x + 1, y + 1)
> 
> Now the cursor movement is not perfect but it's usable.
> 
> My questions:
> 
> - Is it possible that X=1 and Y=1 has to be the base for "no movement"?
> - Is there any *really* good documentation for all those X-functions?
> - Will X use "conversion_proc" on the values I forward to 
> "xf86PostMotionEvent"?
> 
> 
> I've used pastebin to place two logs I've created. In both logs I've 
> started with slow movement and then started to move the cursor faster.
> 
> The first one shows the values that get forwarded to 
> "xf86PostMotionEvent" without the "+1" in the code. In this example the 
> cursor moved to the top left corner even if I moved down right. As soon 
> as the movement got faster the cursor moved down right.
> http://pastebin.com/496803
> 
> The second example shows the same with "+1" in code. Now anything worked 
> as expected (not perfect but it works).
> http://pastebin.com/496822
> 
> Thank you very much in advance
> 
> CU
> 
> Manuel