[PATCH inputproto multitouch] State that future touch IDs are indeterminate

Peter Hutterer peter.hutterer at who-t.net
Mon Dec 12 13:40:56 PST 2011

On Mon, Dec 12, 2011 at 10:56:40AM -0800, Chase Douglas wrote:
> This just makes it absolutely clear that clients should not make any
> assumptions about future touch ID values.
> I also added "strictly monotonically" increasing to the definition of
> touch IDs. It's a more precise definition of the protocol.
> Signed-off-by: Chase Douglas <chase.douglas at canonical.com>
> ---
>  specs/XI2proto.txt |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
> diff --git a/specs/XI2proto.txt b/specs/XI2proto.txt
> index ba5f7b7..8e4f948 100644
> --- a/specs/XI2proto.txt
> +++ b/specs/XI2proto.txt
> @@ -2149,9 +2149,11 @@ may not be the logical center of the touch.
>  Touch tracking IDs are provided in the detail field of touch events. Its
>  value is always provided in every touch event. Tracking IDs are
> -represented as unsigned 32-bit values and increase in value for each new
> -touch, wrapping back to 0 upon reaching the numerical limit of IDs. IDs are
> -globally unique.
> +represented as unsigned 32-bit values and increase strictly monotonically in
> +value for each new touch, wrapping back to 0 upon reaching the numerical limit
> +of IDs. The distance between two touch IDs is indeterminate. Clients may not
> +assume that any future touches will have specific touch IDs. IDs are globally
> +unique.

s/distance/increment/ maybe? or whatever the right word is here.

Reviewed-by: Peter Hutterer <peter.hutterer at who-t.net> either way


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