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index 8740920..4b86621 100644
--- a/compositeproto.txt
+++ b/compositeproto.txt
@@ -1,6 +1,6 @@
Composite Extension
Version 0.4
- 2007-4-17
+ 2007-7-3
Keith Packard
keithp@keithp.com
Deron Johnson
@@ -34,6 +34,9 @@ both early prototypes and the final design include:
+ Deron Johnson for the Looking Glass implementation and
a prototype of the coordinate transformation mechanism.
+ + Ryan Lortie for helping figure out reasonable parent clipping
+ semantics in the presense of manual redirected children.
+
3. Architecture
The composite extension provides three related mechanisms:
@@ -129,11 +132,16 @@ redefine its input region, but the specific arbitration rules followed
by these clients is not defined by this specification; these policies
should be defined by the clients themselves.
-3.3 Coordinate transform redirection
+3.3 Clipping semantics redefined
-Version 0.4 of the protocol adds the coordinate transformation redirection
-portions of the protocol which externalize the relationship between
-parent and child positions with respect to pointer coordinates.
+Version 0.4 of the protocol changes the semantics of clipping in the
+presense of manual redirect children. In version 0.3, a parent was always
+clipped to child windows, independent of the kind of redirection going on.
+With version 0.4, the parent is no longer clipped to child windows which are
+manually redirected. This means the parent can draw in the child region without using
+IncludeInferiors mode, and (perhaps more importantly), it will receive
+expose events in those regions caused by other actions. This new behaviour
+is not selectable.
4. Errors
@@ -147,34 +155,6 @@ The composite extension does not define any new errors.
child: Window
x, y: CARD16
-6. Events
-
-Version 0.4 of the Composite protocol defines one new event
-
- TransformCoordinateNotify
-
- subtype: COORDINATEEVENT
- window: Window
- child: Window
- time: Timestamp
- serialNumber: CARD32
- count: CARD32
- x, y: INT16
-
- This event is delivered to the client requesting for coordinate
- redirection for 'window'. 'x' and 'y' are a location in 'child' if
- not None, else in 'window'. 'time' is the time of any related
- pointer event. 'serialNumber' serves to sequence transformations.
- 'count' indicates the number of events still to be delivered for
- 'window' to satisfy a particular operation within the server
-
- The client must respond to this event with a suitable
- TransformCoordinate request that includes matching 'window', 'child'
- and serialNumber fields.
-
- 'serialNumber' may be repeated in multiple events, indicating that
- the server needs to redo the same transformation for some reason.
-
7. Extension Initialization
The client must negotiate the version of the extension before executing