dix: Add unaccelerated valuators to the ValuatorMask

Allows a mask to carry both accelerated and unaccelerated motion at the same
time.

This is required for xf86-input-libinput where the pointer acceleration
happens in libinput already, but parts of the server, specifically raw events
and DGA rely on device-specific unaccelerated data.

To ease integration add this as a second set to the ValuatorMask rather than
extending all APIs to carry a second, possibly NULL set of valuators.

Note that a valuator mask should only be used in either accel/unaccel or
standard mode at any time. Switching requires either a valuator_mask_zero()
call or unsetting all valuators one-by-one. Trying to mix the two will produce
a warning.

The server has a shortcut for changing a mask with the
valuator_mask_drop_unaccelerated() call. This saves us from having to loop
through all valuators on every event, we can just drop the bits we know we
don't want.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 75 insertions, 3 deletions

diff --git a/dix/inpututils.c b/dix/inpututils.c
index 5c2a32d1c..136398842 100644
--- a/dix/inpututils.c
+++ b/dix/inpututils.c
@@ -505,15 +505,23 @@ valuator_mask_isset(const ValuatorMask *mask, int valuator)
     return mask->last_bit >= valuator && BitIsOn(mask->mask, valuator);
 }
 
+static inline void
+_valuator_mask_set_double(ValuatorMask *mask, int valuator, double data)
+{
+    mask->last_bit = max(valuator, mask->last_bit);
+    SetBit(mask->mask, valuator);
+    mask->valuators[valuator] = data;
+}
+
 /**
  * Set the valuator to the given floating-point data.
  */
 void
 valuator_mask_set_double(ValuatorMask *mask, int valuator, double data)
 {
-    mask->last_bit = max(valuator, mask->last_bit);
-    SetBit(mask->mask, valuator);
-    mask->valuators[valuator] = data;
+    BUG_WARN_MSG(mask->has_unaccelerated,
+                 "Do not mix valuator types, zero mask first\n");
+    _valuator_mask_set_double(mask, valuator, data);
 }
 
 /**
@@ -594,11 +602,15 @@ valuator_mask_unset(ValuatorMask *mask, int valuator)
 
         ClearBit(mask->mask, valuator);
         mask->valuators[valuator] = 0.0;
+        mask->unaccelerated[valuator] = 0.0;
 
         for (i = 0; i <= mask->last_bit; i++)
             if (valuator_mask_isset(mask, i))
                 lastbit = max(lastbit, i);
         mask->last_bit = lastbit;
+
+        if (mask->last_bit == -1)
+            mask->has_unaccelerated = FALSE;
     }
 }
 
@@ -611,6 +623,66 @@ valuator_mask_copy(ValuatorMask *dest, const ValuatorMask *src)
         valuator_mask_zero(dest);
 }
 
+Bool
+valuator_mask_has_unaccelerated(const ValuatorMask *mask)
+{
+    return mask->has_unaccelerated;
+}
+
+void
+valuator_mask_drop_unaccelerated(ValuatorMask *mask)
+{
+    memset(mask->unaccelerated, 0, sizeof(mask->unaccelerated));
+    mask->has_unaccelerated = FALSE;
+}
+
+/**
+ * Set both accelerated and unaccelerated value for this mask.
+ */
+void
+valuator_mask_set_unaccelerated(ValuatorMask *mask,
+                                int valuator,
+                                double accel,
+                                double unaccel)
+{
+    BUG_WARN_MSG(mask->last_bit != -1 && !mask->has_unaccelerated,
+                 "Do not mix valuator types, zero mask first\n");
+    _valuator_mask_set_double(mask, valuator, accel);
+    mask->has_unaccelerated = TRUE;
+    mask->unaccelerated[valuator] = unaccel;
+}
+
+double
+valuator_mask_get_accelerated(const ValuatorMask *mask,
+                              int valuator)
+{
+    return valuator_mask_get_double(mask, valuator);
+}
+
+double
+valuator_mask_get_unaccelerated(const ValuatorMask *mask,
+                                int valuator)
+{
+    return mask->unaccelerated[valuator];
+}
+
+Bool
+valuator_mask_fetch_unaccelerated(const ValuatorMask *mask,
+                                  int valuator,
+                                  double *accel,
+                                  double *unaccel)
+{
+    if (valuator_mask_isset(mask, valuator)) {
+        if (accel)
+            *accel = valuator_mask_get_accelerated(mask, valuator);
+        if (unaccel)
+            *unaccel = valuator_mask_get_unaccelerated(mask, valuator);
+        return TRUE;
+    }
+    else
+        return FALSE;
+}
+
 int
 CountBits(const uint8_t * mask, int len)
 {