Hi Pekka, One misspelling and some minor writing nits noted inline below.
> On Jan 30, 2017, at 6:55 AM, Pekka Paalanen <ppaala...@gmail.com> wrote: > > From: Pekka Paalanen <pekka.paala...@collabora.co.uk> > > This is a rough intro to what Xwayland is and does, with just one > implementation detail so far (Window identification). > > I paid no attention to formatting details, those can be polished in > follow-ups. I just want the prose out. > > I also just quickly whacked up the diagram, would be happy to see > someone replace it with a nicer one. I just didn't have time to learn > dot for now. > > v2: > - typo fix > - rephrase "talking to hardware" as "driving the displays" > - mention circular dependency in intro > - add section to explain rootless and rootful modes > - remove paragraph about Xwayland protocol usage > - move TBD part to the end under a new section header > > v3: > - use "advantage" and "disadvantage" instead of "pro" and "con" > - slight rewording on rootful mode and rootless mode paragraphs > - removed the paragraph about the lack of shell and special Wayland > protocol extensions > - removed the commented out list of ideas to write > > Cc: Olivier Fourdan <ofour...@redhat.com> > Cc: Jonas Ådahl <jad...@gmail.com> > Cc: Daniel Stone <dan...@fooishbar.org> > Signed-off-by: Pekka Paalanen <pekka.paala...@collabora.co.uk> > --- > doc/publican/Makefile.am | 5 +- > doc/publican/sources/Wayland.xml | 1 + > doc/publican/sources/Xwayland.xml | 170 +++++++++++++++++++++ > .../sources/images/xwayland-architecture.png | Bin 0 -> 7611 bytes > 4 files changed, 175 insertions(+), 1 deletion(-) > create mode 100644 doc/publican/sources/Xwayland.xml > create mode 100644 doc/publican/sources/images/xwayland-architecture.png > > diff --git a/doc/publican/Makefile.am b/doc/publican/Makefile.am > index 57728a0..e861fe6 100644 > --- a/doc/publican/Makefile.am > +++ b/doc/publican/Makefile.am > @@ -24,9 +24,11 @@ publican_sources = \ > $(srcdir)/sources/Preface.xml \ > $(srcdir)/sources/Revision_History.xml \ > $(srcdir)/sources/Protocol.xml \ > + $(srcdir)/sources/Xwayland.xml \ > $(srcdir)/sources/Compositors.xml \ > $(srcdir)/sources/images/icon.svg \ > $(srcdir)/sources/images/wayland.png \ > + $(srcdir)/sources/images/xwayland-architecture.png \ > $(srcdir)/sources/Client.xml \ > $(srcdir)/sources/Server.xml > > @@ -43,7 +45,8 @@ css_sources = \ > > img_sources = \ > $(srcdir)/sources/images/icon.svg \ > - $(srcdir)/sources/images/wayland.png > + $(srcdir)/sources/images/wayland.png \ > + $(srcdir)/sources/images/xwayland-architecture.png > > doxygen_img_sources := \ > $(doxydir)/xml/wayland-architecture.png \ > diff --git a/doc/publican/sources/Wayland.xml > b/doc/publican/sources/Wayland.xml > index 2f47f13..0457c15 100644 > --- a/doc/publican/sources/Wayland.xml > +++ b/doc/publican/sources/Wayland.xml > @@ -11,6 +11,7 @@ > <xi:include href="Compositors.xml" > xmlns:xi="http://www.w3.org/2001/XInclude" /> > <xi:include href="Architecture.xml" > xmlns:xi="http://www.w3.org/2001/XInclude" /> > <xi:include href="Protocol.xml" xmlns:xi="http://www.w3.org/2001/XInclude" > /> > + <xi:include href="Xwayland.xml" xmlns:xi="http://www.w3.org/2001/XInclude" > /> > <xi:include href="ProtocolSpec.xml" > xmlns:xi="http://www.w3.org/2001/XInclude" /> > <xi:include href="Client.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/> > <xi:include href="Server.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/> > diff --git a/doc/publican/sources/Xwayland.xml > b/doc/publican/sources/Xwayland.xml > new file mode 100644 > index 0000000..06f6249 > --- /dev/null > +++ b/doc/publican/sources/Xwayland.xml > @@ -0,0 +1,170 @@ > +<?xml version='1.0' encoding='utf-8' ?> > +<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" > "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ > +<!ENTITY % BOOK_ENTITIES SYSTEM "Wayland.ent"> > +%BOOK_ENTITIES; > +]> > +<chapter id="chap-X11-Application-Support"> > + <title>X11 Application Support</title> > + <section id="sect-X11-Application-Support-introduction"> > + <title>Introduction</title> > + <para> > + Being able to run existing X11 applications is crucial for the adoption > + of Wayland, especially on desktops, as there will always be X11 > + applications that have not been or cannot be converted into Wayland > + applications, and throwing them all away would be prohibitive. > + Therefore a Wayland compositor often needs to support running X11 > + applications. > + </para> > + <para> > + X11 and Wayland are different enough that there is no "simple" way to > + translate between them. Most of X11 is uninteresting to a Wayland > + compositor. That combined with the gigantic implementation effort > needed That, combined... to support X11, makes... > + to support X11 makes it intractable to just write X11 support directly > in > + a Wayland compositor. The implementation would be nothing short from a short of a > + real X11 server. > + </para> > + <para> > + Therefore Wayland compositors should use Xwayland, the X11 server that Therefore, Wayland... > + lives in the Xorg server source code repository and shares most of the > + implementation with the Xorg server. Xwayland is a complete X11 server, > + just like Xorg is, but instead of driving the displays and opening > input > + devices, it acts as a Wayland client. The rest of this chapter talks > + about how Xwayland works. > + </para> > + <para> > + For integration and architecture reasons, while Xwayland is a Wayland > + client of the Wayland compositor, the Wayland compositor is an X11 > client > + of Xwayland. This circular dependency requires special care from the > + Wayland compositor. > + </para> > + </section> > + <section id="sect-X11-Application-Support-two-modes"> > + <title>Two Modes for Foreign Windows</title> > + <para> > + In general, windows from a foreign window system can be presented in > one > + of two ways: rootless and rootful (not rootless). > + </para> > + <para> > + In rootful mode, the foreign window system as a whole is represented > as a > + window (or more) of its own. You have a native window, inside which all > + the foreign windows are. The advantage of this approach in Xwayland's > + case is that you can run your favourite X11 window manager to manage > your > + X11 applications. The disadvantage is that the foreign windows do not > + integrate with the native desktop. Therefore this mode is not usually > + used. > + </para> > + <para> > + In rootless mode, each foreign window is a first-class resident among > the > + native windows. Foreign windows are not confined inside a native window > + but act as if they were native windows. The advantage is that one can > + freely stack and mix native and foreign windows, which is not possible > in > + rootful mode. The disadvantage is that this mode is harder to implement > + and fundamental differences in window systems may prevent some things > + from working. With rootless Xwayland, the Wayland compositor must take > + the role as the X11 window manager, and one cannot use any other X11 > + window manager in its place. > + </para> > + <para> > + This chapter concentrates on the rootless mode, and ignores the rootful > + mode. > + </para> > + </section> > + <section id="sect-X11-Application-Support-architecture"> > + <title>Architecture</title> > + <para> > + A Wayland compositor usually takes care of launching Xwayland. > + Xwayland works in cooperation with a Wayland compositor as follows: > + </para> > + <figure> > + <title>Xwayland architecture diagram</title> > + <mediaobjectco> > + <imageobjectco> > + <imageobject> > + <imagedata fileref="images/xwayland-architecture.png" > format="PNG" /> > + </imageobject> > + </imageobjectco> > + </mediaobjectco> > + </figure> > + <para> > + An X11 application connects to Xwayland just like it would connect to > any > + X server. Xwayland processes all the X11 requests. On the other end, > + Xwayland is a Wayland client that connects to the Wayland compositor. > + </para> > + <para> > + The X11 window manager (XWM) is an integral part of the Wayland > + compositor. XWM uses the usual X11 window management protocol to manage > + all X11 windows in Xwayland. Most importantly, XWM acts as a bridge > + between Xwayland window state and the Wayland compositor's window > manager > + (WWM). This way WWM can manage all windows, both native Wayland and X11 > + (Xwayland) windows. This is very important for a coherent user > + experience. > + </para> > + <para> > + Since Xwayland uses Wayland for input and output, it does not have any > + use for the device drivers that Xorg uses. None of the xf86-video-* or > + xf86-input-* modules are used. There also is no configuration file for > + the Xwayland server. For optional hardware accelerated rendering, > + Xwayland uses GLAMOR. > + </para> > + <para> > + A Wayland compositor usually spawns only one Xwayland instance. This is > + because many X11 applications assume they can communicate with other > X11 > + applications through the X server, and this requires a shared X server > + instance. This also means, that Xwayland does not protect nor isolate > X11 This also means that... > + clients from each other, unless the Wayland compositor specifically > + chooses to break the X11 client intercommunications by spawning > + application specific Xwayland instances. X11 clients are naturally > + isolated from Wayland clients though. isolated from Wayland clients. > + </para> > + <para> > + Xwayland compatibility compared to a native X server will probably > never > + reach 100%. Desktop environment (DE) components, specifically X11 > window > + managers, are practically never supported. An X11 window manager would > + not know about native Wayland windows, so it could manage only X11 > + windows. OTOH, there must be an XWM that reserves the exclusive window On the other hand, ... > + manager role so that the Wayland compositor could show the X11 windows > + appropriately. For other DE components like pagers and panels adding > the For other DE components, like pagers and panels, adding the > + necessary interfaces to support them in WWM through XWM is often > + considered not worthwhile. > + </para> > + </section> > + <section id="sect-X11-Application-Support-xwm"> > + <title>X Window Manager (XWM)</title> > + <para> > + From the X11 point of view, the X window manager (XWM) living inside a > + Wayland compositor is just like any other window manager. The > difference > + is mostly in which process it resides in, and the few extra conventions > + in the X11 protocol to support Wayland window management (WWM) > + specifically. > + </para> > + <para> > + There are two separate, asynchronous communication channels between asynchronous > + Xwayland and a Wayland compositor: one uses the Wayland protocol, and > the > + other one solely for XWM uses X11 protocol. This setting demands great other one, solely for XWM, uses the X11 protocol. ... > + care from the XWM implementation to avoid (random) deadlocks with > + Xwayland. It is often nearly impossible to prove that synchronous or > + blocking X11 calls from XWM cannot cause a deadlock, and therefore it > is > + strongly recommended to make all X11 communications asynchronous. All > + Wayland communications are already asynchonous by design. > + </para> > + <section id="sect-X11-Application-Support-xwm-window-identification"> > + <title>Window identification</title> > + <para> > + In Xwayland, an X11 window may have a corresponding wl_surface object > + in Wayland. The wl_surface object is used for input and output: it is > + referenced by input events and used to provide the X11 window content > + to the Wayland compositor. The X11 window and the wl_surface live in > + different protocol streams, and they need to be matched for XWM to do > + its job. > + </para> > + <para> > + When Xwayland creates a wl_surface on Wayland, it will also send an > X11 > + ClientMessage of type atom "WL_SURFACE_ID" to the X11 window carrying > + the wl_surface Wayland object ID as the first 32-bit data element. > This > + is how XWM can associate a wl_surface with an X11 window. Note, that Note that... Regards, yong > + the request to create a wl_surface and the ID message may arrive in > any > + order in the Wayland compositor. > + </para> > + </section> > + </section> > +</chapter> > diff --git a/doc/publican/sources/images/xwayland-architecture.png > b/doc/publican/sources/images/xwayland-architecture.png > new file mode 100644 > index > 0000000000000000000000000000000000000000..f24dc1837f2e190c9d38719420a844aeb5997efa > GIT binary patch > literal 7611 > zcmb`M2UJsQx`q)I=^!9T^#n0UM?ktDD2S1wp?9SBE*;SWNbe|wdJqEAdq)riaw1JY > zdI<=j_Yz7d_jk&fxpU8)nLBH;Ru(%DcK+=D``+()-yQZ;^$`Ur6Da`!0mWmbhj0Rd > z3&P-OMob8PGhO9-27X+0lYgv1OiVm6t2P5(k~k~rx)Bgu`TFB|p*~_UlYoHL=<!22 > z4X?EIDc`5+R?}Cu7GqzjJmeT7B&uRfR*KUvRxFBE-A`wIwDohZj^jp0mriUtcXote > z1D{br`g%p<-FIbtbEJ{<uRE9{8pN-;bN7CSy>;nSoP6=<(bY%PJS4RoeR$L|+aL!! > zA=*3MPc}fDv(MW#10#VRS&Z!>$>Qx_-M^G(a<qf(^=c9l7Vel9?)x@6x^&Znf?$Rq > zp5zmI{^;eVr|Rkn%23)y(gPee$@mN_5a7~!zfh}qyxc5=jA+Mxcd>7Cd3iQzOl4uh > zsf918tD~gtqe_Yh`tHTkH7nUv8UF^m&K(mOnZCZ~E}~?g*g0rlDJVe+B4U*Z=phIK > zUU{JlIzi@yWyI)9CRcxa>L0x!PMcGhkI$j&9p8zos;a7wk7P^tY0L|&kf<4$(Y{x? 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