Google Summer of Code 2010/VNC: Difference between revisions

From QEMU
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== Encodings ==
== Encodings ==


=== Feature Matrix ===
==== Servers ====
{| class="wikitable sortable" style="font-size: 85%; text-align: center; width: auto;"
! style="width:12em" | Server
| Raw
|CopyRect
|RRE
|CoRRE
|Hextile
|ZRLE
|zlib
|tight
|zlibhex
|-
|libvncserver
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|-
|tigervnc
|
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|-
|ultravnc
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|-
|tightvnc
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|-
|realvnc
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|-
|qemu
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|}
==== Clients ====
{| class="wikitable sortable" style="font-size: 85%; text-align: center; width: auto;"
|-
! style="width:12em" | Server
|Raw
|CopyRect
|RRE
|CoRRE
|Hextile
|ZRLE
|zlib
|tight
|zlibhex
|-
|libvncclient
|
|
|
|
|
|
|
|
|-
|tigervnc
|
|
|
|
|
|
|
|
|-
|ultravnc
|
|
|
|
|
|
|
|
|-
|tightvnc
|
|
|
|
|
|
|
|
|-
|realvnc
|
|
|
|
|
|
|
|
|-
|qemu
|
|
|
|
|
|
|
|
|}
''describe some encodings here''
''describe some encodings here''


Revision as of 06:06, 29 April 2010

Summary

QEMU's built-in VNC server only supports the Hextile encoding. Hextile only uses tile-based compression. Other encodings are more popular such as Tight and ZRLE that use zlib-based compression. These encodings significantly reduce the bandwidth required by VNC.

Owner

Detailed Summary

QEMU's built-in VNC server only supports the Hextile encoding. Hextile only uses tile-based compression. Other encodings are more popular such as Tight and ZRLE that use zlib-based compression. These encodings significantly reduce the bandwidth required by VNC. This project would start by implementing support for Tight or ZRLE. Both encodings support a combination of tile-based compression and zlib-compression. Initially, one would implement zlib-compression only and compare the results to our Hextile implementation. Depending on progress, tile-based compression mechanisms (such as Tight's gradient algorithm) could be explored. At each stage, we expect that performance comparisons are done to determine the effectiveness of the additional algorithm. Additional compression mechanisms like Tight's JPEG encoding could also be evaluated.

Encodings

Feature Matrix

Servers

Server Raw CopyRect RRE CoRRE Hextile ZRLE zlib tight zlibhex
libvncserver
tigervnc
ultravnc
tightvnc
realvnc
qemu

Clients

Server Raw CopyRect RRE CoRRE Hextile ZRLE zlib tight zlibhex
libvncclient
tigervnc
ultravnc
tightvnc
realvnc
qemu

describe some encodings here

Status

Retrieved from "https://wiki.qemu.org/index.php?title=Google_Summer_of_Code_2010/VNC&oldid=299"