input: add support for XIAllDevices and XIAllMasterDevices passive grabs.

These grabs are suported through two fake devices inputInfo.all_devices and
inputInfo.all_master_devices. These devices are not part of the device list
and are only initialised for their device id, nothing else.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

Xi/extinit.c

@@ -188,6 +188,9 @@ static struct dev_type
 CARD8 event_base[numInputClasses];
 XExtEventInfo EventInfo[32];
 
+static DeviceIntRec xi_all_devices;
+static DeviceIntRec xi_all_master_devices;
+
 /**
  * Dispatch vector. Functions defined in here will be called when the matching
  * request arrives.
@@ -1215,6 +1218,17 @@ XInputExtensionInit(void)
 	EventSwapVector[DevicePresenceNotify] = SEventIDispatch;
 
 	GERegisterExtension(IReqCode, XI2EventSwap);
+
+
+	memset(&xi_all_devices, 0, sizeof(xi_all_devices));
+	memset(&xi_all_master_devices, 0, sizeof(xi_all_master_devices));
+	xi_all_devices.id = XIAllDevices;
+	xi_all_devices.name = "XIAllDevices";
+	xi_all_master_devices.id = XIAllMasterDevices;
+	xi_all_master_devices.name = "XIAllMasterDevices";
+
+	inputInfo.all_devices = &xi_all_devices;
+	inputInfo.all_master_devices = &xi_all_master_devices;
     } else {
 	FatalError("IExtensionInit: AddExtensions failed\n");
     }

Xi/xipassivegrab.c

@@ -90,9 +90,16 @@ ProcXIPassiveGrabDevice(ClientPtr client)
     REQUEST(xXIPassiveGrabDeviceReq);
     REQUEST_AT_LEAST_SIZE(xXIPassiveGrabDeviceReq);
 
-    ret = dixLookupDevice(&dev, stuff->deviceid, client, DixGrabAccess);
-    if (ret != Success)
-	return ret;
+    if (stuff->deviceid == XIAllDevices)
+        dev = inputInfo.all_devices;
+    else if (stuff->deviceid == XIAllMasterDevices)
+        dev = inputInfo.all_master_devices;
+    else
+    {
+        ret = dixLookupDevice(&dev, stuff->deviceid, client, DixGrabAccess);
+        if (ret != Success)
+            return ret;
+    }
 
     if (stuff->grab_type != XIGrabtypeButton &&
         stuff->grab_type != XIGrabtypeKeysym &&

dix/events.c

@@ -248,6 +248,18 @@ static Bool CheckPassiveGrabsOnWindow(WindowPtr pWin,
  *
  *     inputInfo.numDevices
  *     Total number of devices.
+ *
+ *     inputInfo.all_devices
+ *     Virtual device used for XIAllDevices passive grabs. This device is
+ *     not part of the inputInfo.devices list and mostly unset except for
+ *     the deviceid. It exists because passivegrabs need a valid device
+ *     reference.
+ *
+ *     inputInfo.all_master_devices
+ *     Virtual device used for XIAllMasterDevices passive grabs. This device
+ *     is not part of the inputInfo.devices list and mostly unset except for
+ *     the deviceid. It exists because passivegrabs need a valid device
+ *     reference.
  */
 InputInfo inputInfo;
 

dix/grabs.c

@@ -267,7 +267,25 @@ GrabMatchesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab, Bool ignoreDevice)
     if (pFirstGrab->grabtype != pSecondGrab->grabtype)
         return FALSE;
 
-    if (!ignoreDevice &&
+    if (pFirstGrab->grabtype == GRABTYPE_XI2)
+    {
+        if (pFirstGrab->device == inputInfo.all_devices ||
+            pSecondGrab->device == inputInfo.all_devices)
+        {
+            /* do nothing */
+        } else if (pFirstGrab->device == inputInfo.all_master_devices)
+        {
+            if (pSecondGrab->device != inputInfo.all_master_devices &&
+                !IsMaster(pSecondGrab->device))
+                return FALSE;
+        } else if (pSecondGrab->device == inputInfo.all_master_devices)
+        {
+            if (pFirstGrab->device != inputInfo.all_master_devices &&
+                !IsMaster(pFirstGrab->device))
+                return FALSE;
+        } else if (pSecondGrab->device != pFirstGrab->device)
+            return FALSE;
+    } else if (!ignoreDevice &&
             ((pFirstGrab->device != pSecondGrab->device) ||
              (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice)))
             return FALSE;

include/inputstr.h

@@ -528,6 +528,8 @@ typedef struct {
     DeviceIntPtr	off_devices;	/* all devices turned off */
     DeviceIntPtr	keyboard;	/* the main one for the server */
     DeviceIntPtr	pointer;
+    DeviceIntPtr	all_devices;
+    DeviceIntPtr	all_master_devices;
 } InputInfo;
 
 extern _X_EXPORT InputInfo inputInfo;