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Describe relationship between RandR, Xinerama and XFree86-VidModeExtension

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Keith Packard 2006-06-25 03:25:59 +02:00
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protocol.txt
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@ -632,11 +632,43 @@ graceful way. Version 1.1 servers and clients are cross compatible with
1.0. Version 1.1 is considered to be stable and we intend upward
compatibility from this point.
10. Relationship between RandR, XFree86-VidModeExtension and Xinerama
10. Relationship with other extensions
Two other extensions have a direct relationship with this extension. This
section attempts to explain how these three are supposed to work together.
10.1 XFree86-VidModeExtension
XFree86-VidModeExtension changes the configuration of a single monitor
attached to the screen without changing the configuration of the screen
itself. It provides the ability to specify new mode lines for the server to
use along with selecting among existing mode lines. As it uses screen
numbers instead of window identifiers, it can be used to affect multiple
monitors in a single-screen Xinerama configuration. However, the association
between screen numbers and root windows in a multi-Screen environment is not
defined by the extension. Version 2.0 of this extension added the ability to
adjust the DAC values in a TrueColor server to modify the brightness curves
of the display.
Most of the utility of this extension is subsumed by RandR version 1.2, with
the noted exception of specifying new mode lines and the gamma adjustments.
If these features continue to be useful, either some relationship between
the screen indices used in the XFree86-VidModeExtension and the
screen/monitor pairs used int RandR or an incorporation of this
functionality into RandR might be needed.
10.2 Xinerama
Xinerama provides a mechanism for describing the relationship between the
overall screen display and monitors placed within that area. As such, it
provides the query functionality of RandR 1.2 without any of the
configuration functionality. Applications using Xinerama to discover
monitor geometry can continue to do so, with the caveat that they will not be
informed of changes when they occur. However, Xinerama configuration data
will be updated, so applications selecting for RandR notification and
re-querying the configuration with the Xinerama extension will get updated
information.
Appendix A. Protocol Encoding
Syntactic Conventions