[PATCH libXi 5/5] Support XI 2.1 XIScrollClass

[Peter Hutterer]

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 include/X11/extensions/XInput2.h |   11 ++++++++++
 man/XIQueryDevice.txt            |   39 +++++++++++++++++++++++++++++++++++++-
 src/XExtInt.c                    |   37 ++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 1 deletions(-)

diff --git a/include/X11/extensions/XInput2.h b/include/X11/extensions/XInput2.h
index 3fcf083..910b25f 100644
--- a/include/X11/extensions/XInput2.h
+++ b/include/X11/extensions/XInput2.h
@@ -133,6 +133,17 @@ typedef struct
     int         mode;
 } XIValuatorClassInfo;
 
+/* new in XI 2.1 */
+typedef struct
+{
+    int         type;
+    int         sourceid;
+    int         number;
+    int         scroll_type;
+    double      increment;
+    int         flags;
+} XIScrollClassInfo;
+
 typedef struct
 {
     int                 deviceid;
diff --git a/man/XIQueryDevice.txt b/man/XIQueryDevice.txt
index 09da8d6..6b5a622 100644
--- a/man/XIQueryDevice.txt
+++ b/man/XIQueryDevice.txt
@@ -100,7 +100,7 @@ DESCRIPTION
 
    The type field specifies the type of the input class.
    Currently, the following types are defined:
-       XIKeyClass, XIButtonClass, XIValuatorClass
+       XIKeyClass, XIButtonClass, XIValuatorClass, XIScrollClass
 
    In the future, additional types may be added. Clients are
    required to ignore unknown input classes.
@@ -194,6 +194,43 @@ DESCRIPTION
    XIModeAbsolute this axis sends absolute coordinates. If the
    mode is XIModeRelative, this device sends relative coordinates.
 
+               typedef struct
+               {
+                   int         type;
+                   int         sourceid;
+                   int         number;
+                   int         scroll_type;
+                   double      increment;
+                   int         flags;
+               } XIScrollClassInfo;
+
+   This class describes scrolling capability on a valuator. For
+   each XIScrollClassInfo, an XIValuatorClassInfo with the same
+   number is present on the device.
+
+   The number field specifies the valuator number on the physical
+   device that this scroll information applies to. See the
+   respective XIValuatorClassInfo for detailed information on this
+   valuator.
+
+   The scroll_type field specifies the type of scrolling, either
+   XIScrollTypeVertical or XIScrollTypeHorizontal.
+
+   The increment specifies the value change considered one unit of
+   scrolling down.
+
+   The flags field specifies flags that apply to this scrolling
+   information:
+
+   If XIScrollFlagNoEmulation is set, the server will not
+   emulate legacy button events for valuator changes on this
+   valuator.
+
+   If XIScrollFlagPreferred is set, this axis is the
+   preferred axis for this scroll type and will be used for
+   the emulation of XI_Motion events when the driver submits
+   legacy scroll button events.
+
    XIQueryDevice can generate a BadDevice error.
 
    XIFreeDeviceInfo frees the information returned by
diff --git a/src/XExtInt.c b/src/XExtInt.c
index 870dc0c..d74a8d4 100644
--- a/src/XExtInt.c
+++ b/src/XExtInt.c
@@ -1039,6 +1039,9 @@ sizeDeviceClassType(int type, int num_elements)
         case XIValuatorClass:
             l = sizeof(XIValuatorClassInfo);
             break;
+        case XIScrollClass:
+            l = sizeof(XIScrollClassInfo);
+            break;
         default:
             printf("sizeDeviceClassType: unknown type %d\n", type);
             break;
@@ -1098,6 +1101,9 @@ copyDeviceChangedEvent(XGenericEventCookie *in_cookie,
             case XIValuatorClass:
                 len += sizeDeviceClassType(XIValuatorClass, 0);
                 break;
+            case XIScrollClass:
+                len += sizeDeviceClassType(XIScrollClass, 0);
+                break;
             default:
                 printf("copyDeviceChangedEvent: unknown type %d\n",
                         any->type);
@@ -1162,6 +1168,15 @@ copyDeviceChangedEvent(XGenericEventCookie *in_cookie,
                     out->classes[i] = (XIAnyClassInfo*)vout;
                     break;
                 }
+            case XIScrollClass:
+                {
+                    XIScrollClassInfo *sin, *sout;
+                    sin = (XIScrollClassInfo*)any;
+                    sout = next_block(&ptr, sizeof(XIScrollClassInfo));
+                    *sout = *sin;
+                    out->classes[i] = (XIAnyClassInfo*)sout;
+                    break;
+                }
         }
     }
 
@@ -1433,6 +1448,9 @@ size_classes(xXIAnyInfo* from, int nclasses)
             case XIValuatorClass:
                 l = sizeDeviceClassType(XIValuatorClass, 0);
                 break;
+            case XIScrollClass:
+                l = sizeDeviceClassType(XIScrollClass, 0);
+                break;
         }
 
         len += l;
@@ -1545,6 +1563,25 @@ copy_classes(XIDeviceInfo* to, xXIAnyInfo* from, int *nclasses)
                     to->classes[cls_idx++] = any_lib;
                 }
                 break;
+            case XIScrollClass:
+                {
+                    XIScrollClassInfo *cls_lib;
+                    xXIScrollInfo *cls_wire;
+
+                    cls_lib = next_block(&ptr_lib, sizeof(XIScrollClassInfo));
+                    cls_wire = (xXIScrollInfo*)any_wire;
+
+                    cls_lib->type = cls_wire->type;
+                    cls_lib->sourceid = cls_wire->sourceid;
+                    cls_lib->number     = cls_wire->number;
+                    cls_lib->scroll_type= cls_wire->scroll_type;
+                    cls_lib->flags      = cls_wire->flags;
+                    cls_lib->increment  = cls_wire->increment.integral;
+                    cls_lib->increment += (unsigned int)cls_wire->increment.frac/(double)(1UL << 32);
+
+                    to->classes[cls_idx++] = any_lib;
+                }
+                break;
         }
         len += any_wire->length * 4;
         ptr_wire += any_wire->length * 4;
-- 
1.7.6