touchui: support XInput2 MT

base/message_pump_x.cc

Index: base/message_pump_x.cc
diff --git a/base/message_pump_x.cc b/base/message_pump_x.cc
index 8e098af95924e57269b906f21eb7975d926d3c0f..2eb9a370146671a85fd3c3e4adf2c5e19b6c52c9 100644
--- a/base/message_pump_x.cc
+++ b/base/message_pump_x.cc
@@ -70,7 +70,11 @@ void InitializeXInput2(void) {
     return;
   }
 
+#if defined(USE_XI2_MT)
+  int major = 2, minor = 1;

[sadrul, 2011/09/19 15:58:08]

Given that the official XInput2.1 will not have the MT support, I wonder if we
should use 2.2 here, and Ubuntu (and/or other distros) carries a patch that
enables it in 2.1, or if we should just use 2.1 as it is in this CL, and give it
a second thought if/when we need to. Daniel?

[Daniel Kurtz, 2011/09/20 05:12:27]

I agree with sadrul.  Please make 2.2 by default.
Perhaps we could pass in the minimum minor version supported via a build-time
flag... like the value of USE_XI2_MT_MINOR?

[ningxin.hu, 2011/09/20 14:28:59]

Thanks for comments. Will use USE_XI2_MT as minimum required XI2 minor version.

+#else
   int major = 2, minor = 0;
+#endif
   if (XIQueryVersion(display, &major, &minor) == BadRequest) {
     VLOG(1) << "XInput2 not supported in the server.";
     xiopcode = -1;