[PATCH wayland v3] doc: start documenting Xwayland
Yong Bakos
junk at humanoriented.com
Tue Mar 7 15:33:45 UTC 2017
Hi Pekka,
One misspelling and some minor writing nits noted inline below.
> On Jan 30, 2017, at 6:55 AM, Pekka Paalanen <ppaalanen at gmail.com> wrote:
>
> From: Pekka Paalanen <pekka.paalanen at 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 <ofourdan at redhat.com>
> Cc: Jonas Ådahl <jadahl at gmail.com>
> Cc: Daniel Stone <daniel at fooishbar.org>
> Signed-off-by: Pekka Paalanen <pekka.paalanen at 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
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> z1659rjf;bLT$3dwBb)nt_h%ltn+Sm_`>_g#i5foR<}`RpVq%p)9=E?bvRep%(aWn&
> zgZoyH5(iE5v(k~>zQf;CD|H=!P0-?<AEdtREqI+AhfYMB1M8X_yonhc1Odf*txcuB
> zd}x_JLV3ZNEOFrGqv$65M&s+(uR)XUT}Hc$@6F82C`Iq+>?WIkx5ov?$H(I~F`3E9
> zO2oQNUfY>xdz`ZxqO!8*5dzIi8yh9X#dlMC{LIYF=ZkbJ&v3OZQ_cRMje>_$T}Lqs
> zNlm7vreD5%@$vP2^5n^SL|8-w4;L5cz1n3b5vCt%(b?WU>NI$k)E2b9d&=qvRD5m+
> z+qKx6&cn-F)m*9!oiir#?PonY_cU31-dpAJ4_as-j+*%4hQnwzxre~?2^}&Y_y;L$
> zW at z!-Ul|%5)u}hgNJ at INw$MF1JRB5s>1?d87St)&Lxgf}zcu*p1?SY^uAtbaCh2+u
> zHemGkS2RQPe>s;5^EurgIoO!8`<M=3`WTPj6$@e0Ghh?8Vn>*v?M3tQ@~FtkLk&YO
> zt_7j;rJ)G%i;Ti7C^U9wWyKbhLb=_A+7R<-Mq7WPHnz^Li_Bh^iT^9j|DPtM{XFL{
> z7e0NuudSUV47=djF3Xq*LyiW6NML+o0>3r;V3FbuXiySbsJIip=FO4a7J!SALXuba
> z^lKe04n}5x>Rn at ImhzAy+pzt!E4ksf^?Ee8uI<yOPe2$Agol4kK%}Hd)*xR=9j{gP
> z$v=1iI=h{}{Ti6s2Je)c2rvC{nENj!FispjFYegw>qC`*o?k01&dbeBQHJJGUU)#u
> ziAaP$>wF;~aBQ4kPyoyBr<VVxs`$~JujLeM)ALHexNV`p9TXK5xK5W)0LA(HD4B6;
> zqwZ!}PebNktsCf!L$X{}*_Q_FacR=t at zeufzs9DeoeWer0j1wPe*zo;n~a~1weg?*
> z9FOOh6xBSyI1SFT@?bQps6?se-OQd~^_-tHFVHB!;c#w?y)G;VJz|*2mH=4}jv$>L
> zA{G=NR!%{|r%1S_mex)bSk-Uf<<|uy0q72}RI<Rq0mvXPx3FVD`R|}PNrTxrIC8+W
> z`sJ7V`5LMzB99L<-~NsAjv20*Vb+b$kG1XXd5zgxZUV9Z=6mnpASNcp$<dLmcM0cN
> z&X|r7Lb>41x5dQ79w{o)6mqVXo1t7?T~*V><ydYF&gxA^G777vODYfplcxlS$A4vG
> zWc0><d8_SThYJ5|Ecv$_{nsTA)W?qlntUJ#mrUz@{P-~gzkw1A_NA}SxWXJHR&(d4
> znDg!P!fjUK|E0oM=DSQP&z{A#ntZjb_EU>e1d8kH<5Q*QATQrWtzV-^+;3a0nEfLW
> z1Tfv^s-u(q6=g3fCMx<PJo#`P?+7-Q7x30~a==@D-r&ZB03YA_>Z+9gvAdt&iL+vD
> zOT_6?+p`Mb&{Uwb$g0v(0cq(bkU(ZVmG(c@$a?DT>4|D at 2gI6Gf~^ez90?>OqGJa)
> z;e-KU!*v&D=cn9nDHkE{y0A=9mg4t}hrnVMdr~<kS$Z}i-&*x$T-7!l8mLGAeh?$8
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> z8%Z{t8m{4+mcp*FuuM)(^#}-nP#KVKSCT+pBJ|cR2TZg7>G8gNU)IRZgmJm4f`^9(
> z3>Lm0`WLq?-ax^5tFop>3&8ErN<)KWmP>o1u$D9 at 0u^)PV0Rb4H>k#i1Ydg>9Iq6X
> zE~zEh7?QU90*E{!0_=w%*EZh?ucX~@5v0bx(&+*3mA^yaaZWj%n$6BW#4xreRjjnC
> z>YIrmd4M~<ar7V#Z4SI$nQQ^TA_qsug`|jx2viiawt;~%7s#qgKjOyo)$@Wf9+YAq
> z)q8ETL*~Jqr0SBa`g(7G$+!m-Zi>H0&e5)(o#BfdyBkxD at ccdC>=FlXIFEdd at o(QA
> z8o%oX<`o!^FW4QR_08o-q(XN8uOQr4bOU+OU)KL4X8qnC#{JfIq{Q$6$6)gW-~~Xc
> zSl6S4o>bt8xsc~aeE~oQ2nh)fZ%U-~uWy=StU$5|hy|xs3ZnJ%S*if)XhFz4u(*i>
> zH8rC32EBcYpLOk8EV8hbeKJz6^Tez~Rvf~&ZdstBSx;PzjErn;xm%>aPciajBq&o2
> zV=%@#I at YHlv0dbplsi^-y$SL0LgM1$X&JqEsRX$a<ptu>{tYaMsFXPF+_?jikCGdP
> z+;8<-+}Fr^r)8Sx;w5P4G7||nKXXzL{1?&&kv2P~$tLfF79~b62~hoOW5NR7LVGw|
> zgMHCes2jLaC)M)=dp at VWn;$tnu4OE|O^^VQG;s6dj9?PjIyl at 4YDb|W3`19mTU_Qf
> zO4GVyW2w(-5d_2#FClRfqYH%p`aa)pqoGe$Y+`I|tiK;(%0<A|X<8n6*xZ+J1iXhI
> zZ}^2*cV1QM{@JF)%Xn?wUt=PWPJ`$B4K<#~HrpL{hvd3L!0lIp#|o+sOXN*{{vZCR
> Bvx)!!
>
> literal 0
> HcmV?d00001
>
> --
> 2.10.2
>
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