Mirror Driver: Grey Boxes

[goergc]

Hi,

we are using UltraVNC (V1.1.9.3) in combination with the mirror driver on a Windows XP 32-Bit system.

Normally everything is working well. But we experience a problem with a software which is developed by us.
The software displays a bitmap inside, on which we draw with GDI functions. Unfortunately UltraVNC only transmits a grey box where the Bitmap should be.
When the mirror driver is deactivated this effect is gone and the bitmap content is transmitted normally.

Has anyone experienced something similar and can help me?

Best regards
Christian Görg

[Rudi De Vos]

A mirror driver mirror gdi functions of a driver, but it can't mirror any video commands
the bypass the gdi ( like hardware acceleration).

Are you displaying the display map with hardware stuff ( directx).
a simple bitblt always work but directx bypass the video driver gdi and
isn't mirrored as the mirror driver can not see it.

[goergc]

As I know we don't use any DirectX or OpenGL methods. I try to extract the problem and put it in an example program, that I can send you.

[Rudi De Vos]

You can fast test it

right click desktop-> properties -> advanced -> troubleshooter
If you move the slider to the left, you disable hardware acceleration.

If it's caused by some hardware acceleration, you now should see it local and remote.

[goergc]

That is the problem. When the slider was at "Disable all DirectDraw and DirectX acceleration" the grey box disappears and the content is displayed.
I think it is .NET or Windows which is accelerating the drawing of the Bitmap in background.
Thanks for your help.

Best regards
Christian Görg