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bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workar
From: |
Daniel Colascione |
Subject: |
bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround |
Date: |
Thu, 29 Dec 2011 17:10:44 -0800 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:8.0) Gecko/20111105 Thunderbird/8.0 |
On 12/29/11 5:04 PM, Jason Rumney wrote:
> Daniel Colascione <dancol@dancol.org> writes:
>
>> Under remote desktop, Windows returns the wrong number of colors from
>> GetDeviceCaps (hdc, NUMCOLORS). I hit this bug myself, and MSDN
>> comments seem to indicate that others hit it as well. The workaround
>> seems harmless: on non-palettized displays, calculating the number of
>> display colors based on display bitness should produce good results.
>
> I've always been under the impression that this is deliberate, and
> related to the bandwidth that is available, so at least applications
> that want to improve performance over low bandwidth links can restrict
> their use of colors.
A remote desktop user can change the depth of the virtual display
presented to applications on the server. If a user wants to trade
fidelity for bandwidth, he can configure his client to use an 8bpp
visual. Some users (me) configure their clients for a relatively high
bit depth, but find that the OS lies to applications some of the time
(NUMCOLORS is wrong, but the display bitness is accurate). I think the
NUMCOLORS behavior is a real bug; if it weren't, the lie would be more
consistently presented.
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- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, (continued)
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Daniel Colascione, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Juanma Barranquero, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Daniel Colascione, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Juanma Barranquero, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Juanma Barranquero, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Daniel Colascione, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Eli Zaretskii, 2011/12/30
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Eli Zaretskii, 2011/12/30
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Juanma Barranquero, 2011/12/30
bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround, Jason Rumney, 2011/12/29
- bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround,
Daniel Colascione <=