Responding to Comments from "Under the Hood of the DWM"

Greg Schechter s Blog Responding to Comments from Under the Hood of | Wood TV Stand

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There is no .NET in Vista Code? - Page 2 | keyongtech

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DWM & Aero Glass at work

David Boschmans Weblog — Thu, 31 May 2007 16:58:21 GMT

When talking about WPF during the Windows Vista ISV Touchdown training a lot of people were interested

DWM & Aero Glass at work

David Boschmans Weblog — Thu, 08 Jun 2006 14:01:36 GMT

When talking about WPF during the Windows Vista ISV Touchdown training a lot of people were interested...

Desktop Window Manager Index of Post Topics

Greg Schechter's Blog — Fri, 21 Apr 2006 10:06:00 GMT

Here's a list of topics that I have posted on (with active links) or expect to post on (without links)...

re: Responding to Comments from "Under the Hood of the DWM"

Wed, 05 Apr 2006 23:17:40 GMT

> I assume you're referring to the issue on XP
> and before that when you drag a window with
> video, the video lags the window. That's
> because in those systems, hardware overlays are
> being used. In Vista, the window is
> composited, and everything is in sync, so no
> more lag.

I hope overlays are still an option. Every other method to playback videos increases CPU usage brutally - up to the point where most CPU is spent on that. I can do 1280x720 with overlays, but only 640x480 without, even using hardware colorspace conversion and resizing. For example VMR9 is "bad" - very bad for me. I don't care about the glitches - I know where they come from, no problem.

re: Responding to Comments from "Under the Hood of the DWM"

Arlie Davis — Wed, 05 Apr 2006 21:04:58 GMT

Stephane,

What occurs is actually a lot faster than blitting a back buffer to the front buffer during vblank. All modern graphics cards simply use a pointer to the current front buffer, so "flipping" is as easy as changing a register in the graphics card. Then the hardware that reads pixel values and sends them to the DACs (for analog RGB) or to the digital DVI just reads pixels from a different memory location.

re: Responding to Comments from "Under the Hood of the DWM"

PatriotB — Mon, 20 Mar 2006 00:58:12 GMT

"2. Is there an API to get the contents of windows belonging to a specific application (either before or after the composition engine takes it for its magic carpet ride)?"

PrintWindow(), WM_PRINT and/or WM_PRINTCLIENT may be what you're looking for. Not sure whether they can include the DWM-rendered window frame.

re: Responding to Comments from "Under the Hood of the DWM"

Michael Price — Thu, 16 Mar 2006 16:32:57 GMT

Oluf,

I noticed the iTunes/QuickTime badness recently as well. I'm not sure, but my uninformed guess is that Apple is using DirectDraw to draw their iTunes window. Use of DirectDraw will disable desktop composition. I also assume that Apple is planning on fixing this.

I'm sure Greg can elaborate on the conditions that turn off the composition engine. At least the OS autodetects when it is safe to reenable.

Michael Price

re: Responding to Comments from "Under the Hood of the DWM"

Oluf Nissen — Thu, 16 Mar 2006 07:44:24 GMT

Greg,

I really liked your talk at the PDC (a late compliment, I know!) That 15 puzzle demo just blew me away. Anyway, here's my real comment:

I noticed that the DWM sometimes gets turned off, so that the "Glass" experience is disabled. Under what circumstances does this happen? How does Vista detect that the DWM needs to be turned off?

I noticed this happening when running iTunes 6.0.2.23 and QuickTime Player 7.0.4.

Any comments?

Responding to Comments from "Under the Hood of the DWM"

Greg Schechter s Blog Responding to Comments from Under the Hood of | Wood TV Stand

There is no .NET in Vista Code? - Page 2 | keyongtech

DWM & Aero Glass at work

DWM &amp; Aero Glass at work

Desktop Window Manager Index of Post Topics

re: Responding to Comments from "Under the Hood of the DWM"

re: Responding to Comments from "Under the Hood of the DWM"

re: Responding to Comments from "Under the Hood of the DWM"

re: Responding to Comments from "Under the Hood of the DWM"

re: Responding to Comments from "Under the Hood of the DWM"

DWM & Aero Glass at work