On Wed, Oct 20, 2010 at 11:34 AM, Eirik Byrkjeflot Anonsen <[email protected]> wrote: > What guarantees does X give when it comes to the order of events > generated in relation to processing of the requests sent by the client? > > (Also, of course: To which degree does various implementations of X > actually fulfill these guarantees?) > > > Some specific questions: > > X events have a "serial" value. I expect that any event delivered by X > will reflect the state after the request number "serial" (and all > preceding requests) have been processed. Is this correct? > > Can I also assume that the X event will reflect the state before any > requests with a later serial number is processed? > > (And I assume that "serial" is monotonically increasing, except on > wrap-arounds...)
I think the ordering is kept for obvious reasons, but you don't know when you'll see the result. > > > > Context: > > Given an application that frequently performs a sequence of XCopyArea() > calls on the contents of a window. When this application receives > Expose events or GraphicsExpose events, it is necessary for the > application to know exactly which XCopyArea calls have taken effect to > be able to correctly calculate which area of the window has become > invalid. I think you are supposed to draw the entire area that is exposed. If that is too costly, maybe render to a backbuffer and copy to the window. Just my two cents. > > > eirik > _______________________________________________ > [email protected]: X.Org support > Archives: http://lists.freedesktop.org/archives/xorg > Info: http://lists.freedesktop.org/mailman/listinfo/xorg > Your subscription address: [email protected] > -- Far away from the primal instinct, the song seems to fade away, the river get wider between your thoughts and the things we do and say. _______________________________________________ [email protected]: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.freedesktop.org/mailman/listinfo/xorg Your subscription address: [email protected]
