[PATCH 1/2] dix: split xi2_mask_isset into a per-device function

[Peter Hutterer]

For touch selection conflicts, we need to check not only if the mask is set
for the device, but if it is set for only that specific device (regardless
of XIAll*Devices)

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 dix/inpututils.c     | 30 +++++++++++++++++++++---------
 include/inpututils.h |  1 +
 test/xi2/xi2.c       |  6 ++++++
 3 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/dix/inpututils.c b/dix/inpututils.c
index f01e9a7..eb11119 100644
--- a/dix/inpututils.c
+++ b/dix/inpututils.c
@@ -1033,6 +1033,21 @@ xi2mask_free(XI2Mask **mask)
 }
 
 /**
+ * Test if the bit for event type is set for this device only.
+ *
+ * @return TRUE if the bit is set, FALSE otherwise
+ */
+Bool
+xi2mask_isset_for_device(XI2Mask *mask, const DeviceIntPtr dev, int event_type)
+{
+    BUG_WARN(dev->id < 0);
+    BUG_WARN(dev->id >= mask->nmasks);
+    BUG_WARN(bits_to_bytes(event_type + 1) > mask->mask_size);
+
+    return BitIsOn(mask->masks[dev->id], event_type);
+}
+
+/**
  * Test if the bit for event type is set for this device, or the
  * XIAllDevices/XIAllMasterDevices (if applicable) is set.
  *
@@ -1043,15 +1058,12 @@ xi2mask_isset(XI2Mask *mask, const DeviceIntPtr dev, int event_type)
 {
     int set = 0;
 
-    BUG_WARN(dev->id < 0);
-    BUG_WARN(dev->id >= mask->nmasks);
-    BUG_WARN(bits_to_bytes(event_type + 1) > mask->mask_size);
-
-    set = ! !BitIsOn(mask->masks[XIAllDevices], event_type);
-    if (!set)
-        set = ! !BitIsOn(mask->masks[dev->id], event_type);
-    if (!set && IsMaster(dev))
-        set = ! !BitIsOn(mask->masks[XIAllMasterDevices], event_type);
+    if (xi2mask_isset_for_device(mask, inputInfo.all_devices, event_type))
+        set = 1;
+    else if (xi2mask_isset_for_device(mask, dev, event_type))
+        set = 1;
+    else if (IsMaster(dev) && xi2mask_isset_for_device(mask, inputInfo.all_master_devices, event_type))
+        set = 1;
 
     return set;
 }
diff --git a/include/inpututils.h b/include/inpututils.h
index cd9a4de..53c96ba 100644
--- a/include/inpututils.h
+++ b/include/inpututils.h
@@ -57,6 +57,7 @@ XI2Mask *xi2mask_new(void);
 XI2Mask *xi2mask_new_with_size(size_t, size_t); /* don't use it */
 void xi2mask_free(XI2Mask **mask);
 Bool xi2mask_isset(XI2Mask *mask, const DeviceIntPtr dev, int event_type);
+Bool xi2mask_isset_for_device(XI2Mask *mask, const DeviceIntPtr dev, int event_type);
 void xi2mask_set(XI2Mask *mask, int deviceid, int event_type);
 void xi2mask_zero(XI2Mask *mask, int deviceid);
 void xi2mask_merge(XI2Mask *dest, const XI2Mask *source);
diff --git a/test/xi2/xi2.c b/test/xi2/xi2.c
index 6ee7052..1cdad1d 100644
--- a/test/xi2/xi2.c
+++ b/test/xi2/xi2.c
@@ -36,8 +36,14 @@ xi2mask_test(void)
     XI2Mask *xi2mask = NULL, *mergemask = NULL;
     unsigned char *mask;
     DeviceIntRec dev;
+    DeviceIntRec all_devices, all_master_devices;
     int i;
 
+    all_devices.id = XIAllDevices;
+    inputInfo.all_devices = &all_devices;
+    all_master_devices.id = XIAllMasterDevices;
+    inputInfo.all_master_devices = &all_master_devices;
+
     /* size >= nmasks * 2 for the test cases below */
     xi2mask = xi2mask_new_with_size(MAXDEVICES + 2, (MAXDEVICES + 2) * 2);
     assert(xi2mask);
-- 
1.7.11.7