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Diffstat (limited to 'compositeproto.txt')
| -rw-r--r-- | compositeproto.txt | 46 |
1 files changed, 13 insertions, 33 deletions
diff --git a/compositeproto.txt b/compositeproto.txt 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 |