[PATCH] dix: allow a ConstantDeceleration between 0 and 1 (#66134)

[Peter Hutterer]

A constant deceleration of x simply means (delta * 1/x). We limited that to
values >= 1.0f for obvious reasons, but can also allow values from 0-1.
That means that ConstantDeceleration is actually a ConstantAcceleration, but
hey, if someone needs it...

X.Org Bug 66134 <http://bugs.freedesktop.org/show_bug.cgi?id=66134>

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 dix/ptrveloc.c               | 5 ++---
 hw/xfree86/man/xorg.conf.man | 3 ++-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/dix/ptrveloc.c b/dix/ptrveloc.c
index d6fef9c..e75300a 100644
--- a/dix/ptrveloc.c
+++ b/dix/ptrveloc.c
@@ -245,11 +245,10 @@ AccelSetDecelProperty(DeviceIntPtr dev, Atom atom,
     if (checkOnly) {
         if (rc)
             return rc;
-        return (v >= 1.0f) ? Success : BadValue;
+        return (v > 0) ? Success : BadValue;
     }
 
-    if (v >= 1.0f)
-        vel->const_acceleration = 1 / v;
+    vel->const_acceleration = 1 / v;
 
     return Success;
 }
diff --git a/hw/xfree86/man/xorg.conf.man b/hw/xfree86/man/xorg.conf.man
index 67d8594..fa5b5fe 100644
--- a/hw/xfree86/man/xorg.conf.man
+++ b/hw/xfree86/man/xorg.conf.man
@@ -972,7 +972,8 @@ is constructed. This is mainly a matter of personal preference.
 .BI "Option \*qConstantDeceleration\*q  \*q" real \*q
 Makes the pointer go
 .B deceleration
-times slower than normal. Most useful for high-resolution devices.
+times slower than normal. Most useful for high-resolution devices. A value
+between 0 and 1 will speed up the pointer.
 .TP 7
 .BI "Option \*qAdaptiveDeceleration\*q  \*q" real \*q
 Allows to actually decelerate the pointer when going slow. At most, it will be
-- 
1.8.2.1