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Alex Goins a90f33721e randr: rrCheckPixmapBounding should only increase screen size
The purpose of rrCheckPixmapBounding() is to make sure that the fb is large
enough to accommodate the region scanned out by a GPU screen. Currently, however,
it will actually shrink the fb if it's larger than it needs to be.

This is a problem when combining PRIME output slaving with arbitrary transforms
with xrandr.

Although arbitrary transforms are not supposed to constrain the size of the fb
(https://lists.freedesktop.org/archives/xorg-devel/2018-January/055563.html),
xrandr will use RRSetScreenSize to resize the desktop to accommodate scaling
transforms, e.g. scaling a 1920x1080 display to 3840x2160 will result in a
desktop size of 3840x2160.

In the case of PRIME, rrCheckPixmapBounding() will be called after
RRSetScreenSize() and it will resize the fb back down to what it would be
without the scaling transform, e.g. 1920x1080. This represents divergence in
behavior between PRIME and non-PRIME outputs.

I had originally made rrCheckPixmapBounding() account for arbitrary transforms,
but realized that the fb being large enough to accommodate arbitrary transforms
is not a hard requirement enforced in the server. Instead, this change simply
makes it so that rrCheckPixmapBounding() will only resize the fb to be larger
than it already is, preventing it from stepping on prior requests to increase
the size of the fb.

Signed-off-by: Alex Goins <agoins@nvidia.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
2018-08-24 09:55:48 +02:00
composite meson: Distribute more SDK headers 2018-04-02 13:42:08 -04:00
config meson: Fix install path for 10-quirks.conf 2018-03-27 10:28:33 -04:00
damageext Use ARRAY_SIZE all over the tree 2017-10-30 13:45:20 -04:00
dbe meson: Distribute more SDK headers 2018-04-02 13:42:08 -04:00
dix dix: check_modmap_change() returns Success, not true 2018-08-08 09:45:27 -04:00
doc Rewrite the byte swapping macros. 2017-04-25 15:01:23 -07:00
dri3 dri3: Switch fds_from_pixmap to stdint types. 2018-05-08 11:59:41 -04:00
exa exa: Use PictureMatchFormat for source-only picture format description 2018-06-01 11:57:15 +02:00
fb meson: Distribute more SDK headers 2018-04-02 13:42:08 -04:00
glamor glamor: Work around GEM usage v2 2018-06-27 15:12:31 -04:00
glx glx/vndcmds: Fix vendor hash table key size 2018-06-21 09:28:41 -04:00
hw meson: Make FALLBACK_INPUT_DRIVER configurable in meson. 2018-08-09 13:42:54 -04:00
include meson: Add detection of libsystemd-daemon. 2018-08-09 13:42:54 -04:00
m4 Add ax_pthread.m4 to m4/ 2016-05-29 19:20:51 -07:00
man man: s/__/@/g 2018-03-27 10:13:17 -04:00
mi mi: Hush an almost certainly bogus warning 2018-04-05 14:18:49 -04:00
miext meson: Distribute more SDK headers 2018-04-02 13:42:08 -04:00
os meson: Get close to parity with autotools for CLIENTIDS tracking. 2018-08-09 13:42:54 -04:00
present present/wnmd: Preserve window pixmap's screen_x/y on flip 2018-06-08 11:18:30 +02:00
pseudoramiX Unvalidated lengths 2017-10-10 23:33:34 +02:00
randr randr: rrCheckPixmapBounding should only increase screen size 2018-08-24 09:55:48 +02:00
record Add a Meson build system alongside autotools. 2017-04-26 15:25:27 -07:00
render animcur: Fix crash when removing a master device 2018-04-24 14:28:27 -04:00
test travis: Bump rawhide image 2018-03-21 12:11:23 -04:00
Xext Xext: dynamically allocate the PanoramiXDepths[j].vids array 2018-07-19 11:52:14 +10:00
xfixes xfixes: Restore monitoring of animated cursors 2018-02-14 13:52:45 -05:00
Xi Xi: add forgotten byte-swaps for Valuator fields 2018-06-08 11:14:37 +10:00
xkb xkb: Silence some compiler warnings 2018-04-05 14:18:47 -04:00
.appveyor.yml appveyor: use meson 2018-03-21 10:16:44 -04:00
.dir-locals.el Add .dir-locals.el 2013-08-17 12:17:36 +02:00
.gitignore .gitignore: Add new autotools file 'test-driver' 2014-04-21 13:41:42 -07:00
.gitlab-ci.yml gitlab-ci: Add for gitlab.freedesktop.org 2018-05-02 15:00:53 -04:00
.travis.yml travis: Drop Xcode 8.2 2018-03-21 12:15:28 -04:00
autogen.sh autogen: Set a default subject prefix for patches 2016-02-08 17:41:38 -05:00
configure.ac autotools: Handle case when bindir var in xkbcomp.pc is absent 2018-08-09 12:26:26 -04:00
COPYING modesetting: Merge modesetting's COPYING into the xserver's. 2014-09-15 12:46:02 -07:00
devbook.am doc: Create a script to filter xmlto output 2015-01-05 14:24:06 -08:00
docbook.am docbook.am: embed css styles inside the HTML HEAD element 2011-09-21 14:07:49 -07:00
fix-miregion Change region implementation names to eliminate the 'mi' prefix 2010-06-05 17:47:32 -07:00
fix-miregion-private Change region implementation names to eliminate the 'mi' prefix 2010-06-05 17:47:32 -07:00
fix-patch-whitespace Rename region macros to eliminate screen argument 2010-06-05 18:59:00 -07:00
fix-region Rename region macros to eliminate screen argument 2010-06-05 18:59:00 -07:00
Makefile.am automake: Fix 'make dist' 2018-03-28 15:11:16 -04:00
manpages.am man: Fix automake seddery 2018-05-08 12:15:30 -04:00
meson_options.txt meson: Make FALLBACK_INPUT_DRIVER configurable in meson. 2018-08-09 13:42:54 -04:00
meson.build meson: Add detection of libsystemd-daemon. 2018-08-09 13:42:54 -04:00
README README: Add link to fd.o CoC 2017-04-11 08:51:34 -04:00
xorg-server.m4 macros: clarify documentation 2012-11-05 13:24:57 -06:00
xorg-server.pc.in xfree86: link modules against Xorg symbols on Cygwin 2012-04-05 21:57:07 -05:00
xserver.ent.in doc: relocate xserver.ent in the package root directory 2011-05-14 11:22:26 -07:00

					X Server

The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.

Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.

For a comprehensive overview of X Server and X Window System, consult the
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https://en.wikipedia.org/wiki/X_server

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