commit 462808803a5034bfb25b22de2630eeb3a63994dd
Author: Peter Rosin <p...@lysator.liu.se>
Date: Tue Jun 16 14:09:52 2009 +0200
Describe the Tight Compression Level Pseudo-encoding.
Signed-off-by: Peter Rosin <p...@lysator.liu.se>
diff --git a/rfbproto.rst b/rfbproto.rst
index 6a0f94e..33a8fc5 100644
--- a/rfbproto.rst
+++ b/rfbproto.rst
@@ -755,7 +755,8 @@ Code Vendor Signature Description
-239 "``TGHT``" "``RCHCURSR``" `Cursor Pseudo-encoding`_ (Rich
Cursor)
-240 "``TGHT``" "``X11CURSR``" X Cursor
--256 "``TGHT``" "``COMPRLVL``" Compression Level
+-256 "``TGHT``" "``COMPRLVL``" `Compression Level
+ Pseudo-encoding`_
-305 "``GGI_``" "``GII_____``" `gii Pseudo-encoding`_
======= =========== =============== ===================================
@@ -1662,6 +1663,7 @@ Number Name
16 `ZRLE Encoding`_
-223 `DesktopSize Pseudo-encoding`_
-239 `Cursor Pseudo-encoding`_
+-247 to -256 `Compression Level Pseudo-encoding`_
-305 `gii Pseudo-encoding`_
-308 `ExtendedDesktopSize Pseudo-encoding`_
-309 `xvp Pseudo-encoding`_
@@ -1677,7 +1679,7 @@ Number Name
17 Hitachi ZYWRLE
-1 to -222 Tight options
-224 to -238 Tight options
--240 to -256 Tight options
+-240 to -246 Tight options
-257 to -272 Anthony Liguori
-273 to -304 VMWare
-306 popa
@@ -2240,6 +2242,22 @@ gracefully, e.g. by showing a black framebuffer or delay
the screen
update until a proper update of the framebuffer contents has been
received.
+Compression Level Pseudo-encoding
+---------------------------------
+
+Specifies the desired compression level. Encoding number -247 implies
+high compression level, -255 implies low compression level. Low
+compression level can be useful to get low latency in medium to high
+bandwidth situations and high compression level can be useful in low
+bandwidth situations.
+
+The compression level concerns lossless compression, and hence the
+setting is a tradoff between CPU time and bandwidth. It is therefore
+probably difficult to define exact cut-off points for which compression
+levels should be used for any given bandwidth. The compression level is
+just a hint for the server, and there is no specification for what a
+specific compression level means.
+
gii Pseudo-encoding
-------------------
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