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luporl 7e142cb2a8 xserver: fix RGB mask handling 
On FreeBSD 13.0-CURRENT for PowerPC64 big-endian (BE), X was
crashing in some cases. For instance, when twm was started
and the background was clicked to open its menu, X crashed
with a segmentation fault, trying to dereference a null pointer
at CreatePicture().

There were 2 issues with xorg-server handling of RGB masks that
caused the pointer above to be null and thus the crash:
- wrong use of ffs() to get the RGB offsets from the masks
- overflow when shifting a 16-bit integer

This change fixes both issues. They happen when the system is BE
but has a video adapter using a little-endian (LE) ARGB32
framebuffer. In order to display the correct colors, this setup
requires a BE RGBA32 color format to be used by X, by setting
the RGB masks appropriately, that didn't work properly because of
the issues above.
 		2021-04-16 14:40:49 +00:00
.gitlab-ci ci: Test ninja dist in meson jobs 2021-01-22 17:03:16 +00:00
Xext meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
Xi Fix XChangeFeedbackControl() request underflow 2021-04-13 14:28:13 +02:00
composite meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
config linux: Fix udev ID_PATH parsing for udl devices 2020-11-25 04:39:14 +00:00
damageext Use ARRAY_SIZE all over the tree 2017-10-30 13:45:20 -04:00
dbe meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
dix dix: Fix URL to description of focus in/out model 2021-03-25 23:18:14 +02:00
doc doc: Update URLs in Xserver-DTrace.xml 2020-07-05 13:18:45 -07:00
dri3 meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
exa exa: rename some badly named variables 2020-07-10 06:17:40 +10:00
fb meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
glamor glamor: Update pixmap's devKind when making it exportable 2020-11-04 10:21:11 -08:00
glx meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
hw xserver: fix RGB mask handling 2021-04-16 14:40:49 +00:00
include meson: switch getpeer* checks to autotools style 2021-04-09 16:44:27 +00:00
m4 Add ax_pthread.m4 to m4/ 2016-05-29 19:20:51 -07:00
man dix: Remove -to option to set the default connection timeout 2019-10-30 16:17:04 +00:00
mi xquartz: Call PseudoramiXExtensionInit() through InitOutput() just like xwin 2021-04-07 16:11:59 -07:00
miext miext: Remove if check which is always true 2021-03-26 09:02:14 +00:00
os meson: Make sure defines are either set to 1 or not defined 2021-04-09 11:18:54 +00:00
present present: fix msc offset calculation in screen mode 2021-04-16 10:53:43 +00:00
pseudoramiX Unvalidated lengths 2017-10-10 23:33:34 +02:00
randr present: fix msc offset calculation in screen mode 2021-04-16 10:53:43 +00:00
record Fix XRecordRegisterClients() Integer underflow 2020-08-25 17:01:29 +02:00
render xserver: fix RGB mask handling 2021-04-16 14:40:49 +00:00
test meson: Disable LTO for tests 2021-04-09 11:18:54 +00:00
xfixes Fix spelling/wording issues 2020-07-05 13:07:33 -07:00
xkb xkb: silence a compiler warning 2021-04-09 17:37:29 +00:00
.appveyor.yml hw/xwin: Remove XSetAuthorization() for helper clients 2020-04-15 14:13:58 +00:00
.dir-locals.el .dir-locals.el: Add missing final newline 2019-10-01 17:05:28 +00:00
.gitignore .gitignore: Add new autotools file 'test-driver' 2014-04-21 13:41:42 -07:00
.gitlab-ci.yml ci: Test ninja dist in meson jobs 2021-01-22 17:03:16 +00:00
.travis.yml travis: Add OSX meson build to matrix 2019-05-02 15:42:58 +00:00
COPYING modesetting: Merge modesetting's COPYING into the xserver's. 2014-09-15 12:46:02 -07:00
Makefile.am xfree86: Merge vbe into int10 2019-10-02 10:03:26 -04:00
README.md Fix spelling/wording issues 2020-07-05 13:07:33 -07:00
autogen.sh autogen: Set a default subject prefix for patches 2016-02-08 17:41:38 -05:00
configure.ac present: fix msc offset calculation in screen mode 2021-04-16 10:53:43 +00:00
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
manpages.am man: Fix automake seddery 2018-05-08 12:15:30 -04:00
meson.build meson: Switch project version to 20.x.y style 2021-04-08 14:06:02 +00:00
meson_options.txt xfree86: Implement a test input driver 2020-12-14 01:12:10 +00:00
xorg-server.m4 xorg-server.m4: just all cflags instead of just sdkdir 2018-09-20 20:12:24 +01:00
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

README.md

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 following article: https://en.wikipedia.org/wiki/X_server

All questions regarding this software should be directed at the Xorg mailing list:

https://lists.freedesktop.org/mailman/listinfo/xorg

The primary development code repository can be found at:

https://gitlab.freedesktop.org/xorg/xserver

For patch submission instructions, see:

https://www.x.org/wiki/Development/Documentation/SubmittingPatches

As with other projects hosted on freedesktop.org, X.Org follows its Code of Conduct, based on the Contributor Covenant. Please conduct yourself in a respectful and civilized manner when using the above mailing lists, bug trackers, etc:

https://www.freedesktop.org/wiki/CodeOfConduct