[kinovea-dev] Re: Direct2D
- From: Joan <joan@xxxxxxxxxxx>
- To: kinovea-dev@xxxxxxxxxxxxx
- Date: Thu, 13 Jan 2011 22:18:55 +0100
Hi,
I have tried the Direct2D / SlimDX code you sent.
I wasn't too sure as to how exactly use the control, here is what I did:
- Added a Direct2DControl member to PlayerScreenUserInterface.
- In the PlayerScreenUserInterface constructor I call
Direct2DControl.SetControl() passing in the center panel (to test on the
back panel for now)
- immediately call Direct2DControl.Run() to trigger initializations.
- At each new frame, (in PlayerScreenUserInterface.ShowNextFrame), I
call Direct2DControl.DrawVideoBitmap() passing in the decoded image,
- and Direct2DControl.Update() to actually draw on the panel.
Let me know if I did anything wrong. Did you also modify
PlayerScreenUserInterface in this way for your tests ?
It seems to work pretty well.
I've tried to instrument and get some figures regarding speed, but it
proved harder than I thought to really pinpoint the rendering time.
(Also I've recently changed machine and it's like everything is running
super fast :-))
The part taking the most time (about 10 to 20ms each frame on my
machine) would seem to be DrawVideoBitmap().
This function involves copying the whole GDI+ bitmap into a Direct2D
bitmap for later use. This is a step we can probably avoid completely by
decoding directly into a Direct2D bitmap from the FFMpeg code.
This is maybe what you suggested in the forum thread... In the case of
pre-extraction to memory, we can also probably keep an in-memory array
of Direct2D bitmaps instead of an array of GDI+ bitmaps. I'm sure we'll
find a way to avoid this extra copy.
About your concern to release resources, I don't think we need to use a
separate form for rendering and react to the OnClose() event of it.
Screens must implement a BeforeClose() method (see AbstractScreen) which
is triggered when the screen is closed (close button, changing screens
configuration, etc.)
We should be able to use it to ask the PlayerScreen and the renderer to
dispose any outstanding resources.
We'll probably need to transform and simplify the DirectXInterface class.
Also, I don't know if we need the other classes, (Direct3D10Context,
etc.) ? If not, we might even merge the two for simplicity.
I haven't looked at the direct2D drawing primitives and how we might
implement the drawing tools visuals.
The architecture discussion will probably depend on how these can be
abstracted between Direct2D and GDI+.
I will create a topic on the wiki to push some schematics of possible
architectures so we are clearer about what we discuss.
Let me know of your experiments.
Thanks,
joan.
Le 10/01/2011 21:34, Joan a écrit :
Hi!
I am super sorry for the delay.
Unfortunately, I haven't had much time to look into this, but I will.
(I have some issues at work with the company wanting to close the
local office, this has somewhat prevented proper focus on the project,
but it's going to resolve one way or the other in the next few weeks.)
Thanks
joan.
Le 05/01/2011 17:34, Hugh a écrit :
Hey Jean,
Was just wondering how the Direct2D code was working for you? Did
you have any luck moving the drawing onto a new form? Just didn't
see any recent changes in the code and was hoping it is working!
Thanks,
Hugh
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