Delphi 12 - Action Bar Menu painting issues with RDS

[Stéphane Wierzbicki 45]

Hello,

 

We have painting issues with Delphi 12 compiled application.

When run from RDS, menu is not correctly painted (see attached gif).

 

There is no issue when running from a user's desktop.

 

Anyone know hof to fix this ?

 

Kind regards,

Stéphane

 

 

RDS Painting issues.zip

[Kas Ob. 121]

31 minutes ago, Stéphane Wierzbicki said:

This has nothing to do with Delphi, in fact this behavior is observed with every software do animation when used with RDP (RDS)

the problem is simple, RDP screen core process will detect screen changes at some intervals, then send these parts, so it goes from full screen update to small part, these animation happens at high frame rate, so either RDP didn't capture the changes because it fall in between its frame capturing time and it did look like was minimum change and not worth updating, or due the high change rate the RDP throttled the update and skipped updating these parts.

 

Recommendation : if possible detect RDP session (RDS as you called it) and disable all animation, this will enhance the fps and prevent what seems like wrong rendering, also if you have shadows, blurring and gradient colors then disabling them will enhance the speed a lot and require less traffic due the smaller images with higher compression without losing quality.

[Stéphane Wierzbicki 45]

Hi Kas Ob.

 

I'm sorry, but this is clearly a defect/change on the VCL side.

The very same application compiled with Delphi 11.3 is working as expected.

When compiled with Delphi 12, menu is messed.

Edited November 27, 2023 by Stéphane Wierzbicki

[dwrbudr 8]

Delphi 12 has some changes related to the DoubleBuffered property and RDM.

Try to play with form's DoubleBuffered and the newly introduced DoubleBufferedMode properties.

 

[Brian Evans 105]

It is an ActionMainMenuBar and the odd behavior, the mouse over highlighting makes menu entries darker and darker each time the mouse passes over them, is apparent in the Windows Sandbox after copying the project's EXE there. The form already has DoubleBuffered set to false which is all the new DoubleBufferedMode does to help over a RD connection. Changing the form width after the menu is darkened makes the menu redraw and it does so correctly. 

 

Looking at differences in Vcl.ActnMenus.pas between 11.x and 12 the draw code changed to add some styling and MDI support however reverting changes doesn't have any effect even in TCustomMDIMenuButton.Paint. 

 

A TMainMenu does not have the odd behaviour. 

Edited November 28, 2023 by Brian Evans

[OlliWW 0]

Has anybody a solution for this problem? We're encountering this problem too with Delphi 12.

The Quality Central is at this moment read only, so that you can't report any bugs to Embarcadero.

[Brian Evans 105]

Was not able to find a solution. Did a build with Delphi 12 patch 1 and tested in a Windows Sandbox and the issue persists. 

 

 

Edited February 27 by Brian Evans

[Morgan Christen 1]

My VPS clients reported flickering, which I have cured withe the following code:

 

// Fix RDP flickering in Delphi 12
  if application.InRemoteSession then
    if application.SingleBufferingInRemoteSessions then
      application.SingleBufferingInRemoteSessions := false;

 

I apologise for not recording the source of this tip in the comment.

 

I have since discovered that the progress bars from some 3rd parties I use are no longer refreshing as they should. 100% but not quit 100% :0)