Xvnc with RENDER - almost working

[Stuart Kreitman]

The screenshot shows specifically RENDER'd text dropped out.
If you roll the cursor over the dropout and/or select a submeno below 
the bad one,
does the text come back?   That would imply that the data between RENDER 
and vnc
isn't lost, just unsyncronized.
What is the synchronization between vnc.so's pixel scraping and RENDER'd 
text?


skk

Thomas Winischhofer wrote:

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> Peter Åstrand wrote:
> | On Wed, 23 Feb 2005, Peter Åstrand wrote:
> |
> |> I'm attaching two patches that adds RENDER support to Xvnc in Fedora
> |> 3. It works, except that I've found a small glitch when using the
> |> menus in OpenOffice: Sometimes, some of the menu choices disappears.
> |> See screenshot at http://www.cendio.se/~peter/vnc-render-oo.png.
> |>
> |> I've verified this problem both with Fedoras VNC package (with my
> |> attached patches), and with the TightVNC 1.5 series (using xorg 
> 6.8.2).
> |>
> |> A screenshot in the VNC session displays the menus correctly. Also,
> |> doing a "Refresh screen" in the VNC client fixes the problem.
> |
> |
> | I've been able to reproduce the exact problem by loading vnc.so for my
> | :0 display. I've tested vnc.so from:
> |
> | * The original Fedora 3 VNC package
> |
> | * RealVNCs binary 4.0 package
> |
> | * RealVNC 4.1, built from source
> |
> | The problem appears with all these versions. So, this appears to be a
> | very generic RENDER-with-VNC problem. My gut feeling is that there's
> | something wrong with vncHooks.cc, which leads me to a question for the
> | XOrg developers:
> |
> |  How do you implement RENDER support?
> |
> | I've noticed that mga_storm.c and others have a RenderCallback function
> | and defines a RENDER_DELAY. What's the purpose of these? Are these
> | required to properly support RENDER?
>
>
> Not RENDER in general, but RENDER *acceleration*. This requires a buffer
> in video RAM which is freed by the blockhandler after RENDER_DELAY if
> unused during this delay.
>
>
> | The problem seems to be timing related; if I start the VNC client with
> | -debugdelay=500, the problem goes away.
>
> What video hardware are you running? (Sorry, I missed the initial 
> posting)
>
> Thomas
>
> - --
> Thomas Winischhofer
> Vienna/Austria
> thomas AT winischhofer DOT net           *** http://www.winischhofer.net
> twini AT xfree86 DOT org
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