On Thu, Jul 24, 2014 at 12:04:02PM -0700, Jason Gerecke wrote:
> Currently pointer arbitration is taken care of through the use of
> a 'wcomPenInProx' variable in the WacomCommonRec. If two devices
> share a 'common' variable, the commonDispatchDevice function will
> ensure that touches do not move the pointer while the pen is in
> proximity.
>
> This patch adds support for cross-device pointer arbitration to
> prevent other touches known to the driver from moving the pointer.
> This is achieved with the introduction of a 'WACOM_DRIVER' structure
> that is shared by all tools. Inside this structure is an 'active'
> variable that keeps track of the last tool which was actively
> controlling the pointer. When an event from any tool comes in, the
> driver will attempt to determine if it should be filtered or not.
> In some cases, the new device will be allowed to take control of
> the pointer, and become the new active device.
>
> Note that arbitration occurs *after* we store the device state
> to pChannel->valid.state. The code in wcmTouchFilter.c assumes
> that states are not missing, and can become desynchronized from
> reality if (for example) a finger were to go out of prox without
> a corresponding state update.
>
> Signed-off-by: Jason Gerecke <[email protected]>
> ---
> src/wcmCommon.c | 69
> ++++++++++++++++++++++++++++++++++++-----------------
> src/xf86WacomDefs.h | 8 ++++++-
> 2 files changed, 54 insertions(+), 23 deletions(-)
>
> diff --git a/src/wcmCommon.c b/src/wcmCommon.c
> index 5bcd755..4e7098a 100644
> --- a/src/wcmCommon.c
> +++ b/src/wcmCommon.c
> @@ -28,6 +28,11 @@
> #include <xkbsrv.h>
> #include <xf86_OSproc.h>
>
> +
> +struct _WacomDriverRec WACOM_DRIVER = {
> + .active = NULL,
> +};
just to make sure: you're intending to block events from other, unrelated
devices if multiple tablets are connected? say, block touch from an I5 while
a pen is active on a cintiq.
> +
> /* X servers pre 1.9 didn't copy data passed into xf86Post*Event.
> * Data passed in would be modified, requiring the driver to copy the
> * data beforehand.
> @@ -832,6 +837,34 @@ static WacomToolPtr findTool(const WacomCommonPtr common,
> return tool;
> }
>
> +/**
> + * Check if the given device should grab control of the pointer in
> + * preference to whatever tool currently has access.
> + *
> + * @param pInfo The device to check for access
> + * @param ds The current state of the device
> + * @returns 'TRUE' if control of the pointer should be granted, FALSE
> otherwise
> + */
> +static Bool check_arbitrated_control(InputInfoPtr pInfo, WacomDeviceStatePtr
> ds)
> +{
> + WacomDevicePtr active = WACOM_DRIVER.active;
> + WacomDevicePtr priv = pInfo->private;
> +
> + if (active == NULL || active->oldState.device_id == ds->device_id) {
> + //DBG(-1, priv, "Same device ID as active; allowing access.\n");
/* c-style comments please */
> + return TRUE;
> + }
> +
> + if (IsPad(priv)) {
> + // Pad may never be the "active" pointer controller
> + return FALSE;
> + }
> + else {
> + // EMR events may take control from touch at any time
EMR?
Cheers,
Peter
> + return !IsTouch(priv);
> + }
> +}
> +
>
> /*****************************************************************************
> * wcmEvent -
> * Handles suppression, transformation, filtering, and event dispatch.
> @@ -933,6 +966,20 @@ void wcmEvent(WacomCommonPtr common, unsigned int
> channel,
> pChannel->valid.state = ds; /*save last raw sample */
> if (pChannel->nSamples < common->wcmRawSample) ++pChannel->nSamples;
>
> + /* arbitrate pointer control */
> + if (check_arbitrated_control(pInfo, &ds)) {
> + if (WACOM_DRIVER.active != NULL && priv != WACOM_DRIVER.active)
> {
> + wcmSoftOutEvent(WACOM_DRIVER.active->pInfo);
> + }
> + if (ds.proximity)
> + WACOM_DRIVER.active = priv;
> + else
> + WACOM_DRIVER.active = NULL;
> + }
> + else if (!IsPad(priv)) {
> + return;
> + }
> +
> if ((ds.device_type == TOUCH_ID) && common->wcmTouch)
> {
> wcmGestureFilter(priv, ds.serial_num - 1);
> @@ -1125,28 +1172,6 @@ static void commonDispatchDevice(InputInfoPtr pInfo,
> return;
> }
>
> - if (TabletHasFeature(common, WCM_PENTOUCH))
> - {
> - if (IsTablet(priv))
> - {
> - common->wcmTouchDevice->common->wcmPenInProx =
> filtered.proximity;
> -
> - /* send touch out when tablet tool coming in-prox for
> - * devices that provide both pen/puck and touch events
> - * so system cursor won't jump between tools.
> - */
> - if (common->wcmTouchDevice->oldState.proximity)
> - {
> - common->wcmGestureMode = 0;
> - wcmSoftOutEvent(common->wcmTouchDevice->pInfo);
> - return;
> - }
> - }
> - else if (IsTouch(priv) && common->wcmPenInProx)
> - /* Ignore touch events when tablet tool is in prox */
> - return;
> - }
> -
> if ((IsPen(priv) || IsTouch(priv)) && common->wcmMaxZ)
> {
> int prev_min_pressure = priv->oldState.proximity ?
> priv->minPressure : 0;
> diff --git a/src/xf86WacomDefs.h b/src/xf86WacomDefs.h
> index 9b81fe0..af1df4e 100644
> --- a/src/xf86WacomDefs.h
> +++ b/src/xf86WacomDefs.h
> @@ -378,6 +378,12 @@ enum WacomProtocol {
> WCM_PROTOCOL_5
> };
>
> +struct _WacomDriverRec
> +{
> + WacomDevicePtr active; /* Arbitrate motion through this pointer */
> +};
> +extern struct _WacomDriverRec WACOM_DRIVER; // Defined in wcmCommon.c
> +
> struct _WacomCommonRec
> {
> /* Do not move device_path, same offset as priv->name. Used by DBG
> macro */
> @@ -393,7 +399,7 @@ struct _WacomCommonRec
> unsigned long wcmKeys[NBITS(KEY_MAX)]; /* supported tool types for the
> device */
> WacomDevicePtr wcmTouchDevice; /* The pointer for pen to access the
> touch tool of the same device id */
> - Bool wcmPenInProx; /* Keep pen in-prox state for touch tool */
> +
> Bool wcmHasHWTouchSwitch; /* Tablet has a touch on/off switch */
> int wcmHWTouchSwitchState; /* touch event disable/enabled by hardware
> switch */
>
> --
> 2.0.2
>
>
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