[Xquartz-dev] Pen / tablet support and Xquartz

[Jonathan Chetwynd]

Ben,

please comment these bugs:
https://bugs.launchpad.net/inkscape/+bug/224290
http://bugzilla.gnome.org/show_bug.cgi?id=152690
jon at joncruz.org should be in contact with you, also on irc  
freenode.net/#inkscape
with some luck you may get a useful response

~:"

Jonathan Chetwynd

j.chetwynd at btinternet.com
http://www.iconomy.org/

+44 (0) 20 7978 1764


On 1 May 2008, at 06:31, Ben Byer wrote:

> I'm trying to add support for tablet events into Xquartz, the Mac OS  
> DDX part of the X.org Xserver.  I've had trouble finding any real  
> documentation about this, so I've mostly been trying to read the gdk  
> source to see what it's looking for, and looking at the events sent  
> by the Wacom driver on Linux.
>
> I now have events coming in that look valid, but gsumi does still  
> reports that I have "no input devices", and the Gimp doesn't  
> recognize my taps with the pen on the tablet.
>
> Here's what xinput reports:
> $ xinput list
> "Virtual core keyboard" id=0    [XKeyboard]
>        Num_keys is 248
>        Min_keycode is 8
>        Max_keycode is 255
> "Virtual core pointer"  id=1    [XPointer]
>        Num_buttons is 32
>        Num_axes is 2
>        Mode is Relative
>        Motion_buffer is 256
>        Axis 0 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 1 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
> "Quartz Pointing Device"        id=2    [XExtensionPointer]
>        Num_buttons is 7
>        Num_axes is 2
>        Mode is Relative
>        Motion_buffer is 256
>        Axis 0 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>
>       Axis 1 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
> "pen"   id=3    [XExtensionPointer]
>        Num_buttons is 3
>        Num_axes is 7
>        Mode is Relative
>        Motion_buffer is 256
>        Axis 0 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 1 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 2 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 3 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 4 :
>               Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 5 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
>        Axis 6 :
>                Min_value is 0
>                Max_value is -1
>                Resolution is 0
> "Quartz Keyboard"       id=4    [XExtensionKeyboard]
>        Num_keys is 248
>        Min_keycode is 8
>        Max_keycode is 255
>
> $ xinput test 3
> [...]
> otion a[0]=535 a[1]=541 a[2]=137 a[3]=0 a[4]=0
> motion a[0]=534 a[1]=541 a[2]=90 a[3]=0 a[4]=0
> motion a[0]=534 a[1]=541 a[2]=74 a[3]=0 a[4]=0
> motion a[0]=533 a[1]=542 a[2]=58 a[3]=0 a[4]=0
> motion a[0]=524 a[1]=707 a[2]=337 a[3]=0 a[4]=0
> [...]
> motion a[0]=514 a[1]=535 a[2]=447 a[3]=0 a[4]=1
> motion a[0]=514 a[1]=535 a[2]=447 a[3]=0 a[4]=5
> motion a[0]=514 a[1]=535 a[2]=443 a[3]=0 a[4]=9
> motion a[0]=514 a[1]=535 a[2]=443 a[3]=0 a[4]=9
> motion a[0]=505 a[1]=535 a[2]=592 a[3]=8 a[4]=0
> motion a[0]=505 a[1]=535 a[2]=592 a[3]=9 a[4]=0
> [...]
>
> The code on the Quartz side is pretty simple:
>
> http://cgit.freedesktop.org/xorg/xserver/tree/hw/xquartz/darwinEvents.c#n363 
>  (but edited here for clarity)
>
> /* These values were chosen to match the output of xinput under  
> Linux */
> #define SCALEFACTOR_TILT        64.0
> #define SCALEFACTOR_PRESSURE    1000.0
>
> void DarwinSendPointerEvents(int ev_type, int ev_button, int  
> pointer_x, int pointer_y,
>                             float pressure, float tilt_x, float  
> tilt_y) {
>        int i, num_events;
>        DeviceIntPtr dev;
>
>        int valuators[5] = {pointer_x, pointer_y, pressure *  
> SCALEFACTOR_PRESSURE,
>                      tilt_x * SCALEFACTOR_TILT, tilt_y *  
> SCALEFACTOR_TILT};
>
>        if (pressure == 0 && tilt_x == 0 && tilt_y == 0) dev =  
> darwinPointer;
>        else dev = darwinTablet;
>
>    mieqEnqueue_lock(); {
>        num_events = GetPointerEvents(darwinEvents, dev, ev_type,  
> ev_button,
>                                      POINTER_ABSOLUTE, 0,  
> dev==darwinTablet?5:2, valuators);
>        for(i=0; i<num_events; i++) mieqEnqueue (dev,&darwinEvents[i]);
>        DarwinPokeEQ();
>
>    } mieqEnqueue_unlock();
> }
>
> Elsewhere, the devices are set up like this:
>
>           InitPointerDeviceStruct((DevicePtr)pPointer, map, 7,
>                                    GetMotionHistory,
>                                    (PtrCtrlProcPtr)NoopDDA,
>                                    GetMotionHistorySize(), 2);
>                                                                 
> pPointer->name = strdup("Quartz Pointing Device");
>
>            InitPointerDeviceStruct((DevicePtr)pPointer, map, 3,
>                                    GetMotionHistory,
>                                    (PtrCtrlProcPtr)NoopDDA,
>                                    GetMotionHistorySize(), 7);
>            InitProximityClassDeviceStruct(pPointer);
>            pPointer->name = strdup("pen");
>
>
> Can anyone give me some advice on what I need to do to get gtk to  
> recognize my input devices?
> Thanks!
> Ben
>
> _______________________________________________
> Xquartz-dev mailing list
> Xquartz-dev at lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo/xquartz-dev

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