MicrosoftDwayneNeed Forum Rss Feed

New Post: Thank you

DwayneNeed — Tue, 21 May 2013 16:51:09 GMT

Awesome, sounds like a great use of this technique.

New Post: Thank you

cwford — Tue, 21 May 2013 16:38:40 GMT

Dwayne,

I know the original post on multi UI threads is six years old, but it really saved me some headaches when I needed to show a busy indicator while a third-party control had the main UI thread tied-up in a way I couldn't offload to a background worker.

Just wanted to say thanks for a very useful piece of code.

New Post: Running background video

DwayneNeed — Thu, 04 Apr 2013 19:43:52 GMT

AVI is just a container format. The video stream inside of it can be in virtually any format, including Full Frame (Uncompressed), Intel Real Time (Indeo), Cinepak, Motion JPEG, Editable MPEG, VDOWave, ClearVideo / RealVideo, QPEG, and MPEG-4 Video.

I'm not certain the codec is the problem. It might simply be that the video is too large, or that the WPF app is using software rendering for some reason.

New Post: Running background video

icube — Thu, 04 Apr 2013 06:39:34 GMT

Hi thanks for the reply.

The video I am running is at HD 1920 by 1080 resolution, in Avi format and it's 12.2MB. I will try different codecs. But how do i know what codec is it running in wpf?

Thanks!

New Post: Running background video

DwayneNeed — Wed, 03 Apr 2013 19:19:58 GMT

WPF already decodes video on separate threads, so that is why you did not see any advantage.

Is the video running at full resolution? That might be pretty heavy regardless. Try using a lower-resolution video if it is just for background effects.

Try different codecs. The degree of GPU acceleration differs depending on the codec.

Is your app using layered windows (semi-transparent)? If so, we have to read the video memory into system memory which is pretty expensive.

Are you using software rendering? That can be very expensive. WPF can render in hardware (GPU assist) and it also supports in rendering on the CPU. The CPU us much more expensive. Perhaps your app is rendering in software? You can force software rendering, but you cannot force hardware rendering. WPF uses hardware rendering if it thinks the GPU is supported (and it has not been forced to use software).

Good luck!

New Post: Running background video

icube — Wed, 03 Apr 2013 04:54:16 GMT

Hi, I've a touch screen application built using WPF running at HD resolution (1920 x 1080) and i have a looping background video that is also in HD. The background video runs as long as the lifetime of the app. The UI is placed "above" (in z order). However the UI's rendering seems jerky and laggy and I want to improve this performance. I tried using the VisualWrapper in my app to run the video in the wish to run the video in another thread however, the result is still the same, i still face jerkiness and lagging. When i run the app without the video running, my UI runs smoother as expected. Can you suggest a way to improve my UI responsiveness?

THANKS!

New Post: Dynamic Custom BitmapSource

DwayneNeed — Mon, 01 Oct 2012 17:05:02 GMT

The last time I looked into this deeply, the bitmap source pixels would be cached. Unfortunately, the mechanisms for updating the cache were not exposed.

Your best bet is probably to look at shader effects, which will be more performant as well.

http://www.codeproject.com/Articles/71617/Getting-Started-with-Shader-Effects-in-WPF

Dwayne Need | System Center

From: MythJuha [email removed]
Sent: Thursday, September 27, 2012 7:26 AM
To: Dwayne Need
Subject: Re: Dynamic Custom BitmapSource [MicrosoftDwayneNeed:241525]

From: MythJuha

Any ideas on this yet? I'm in need of something similar. Think of your ColorKeyBitmap, where i want to dynamically change which color should be used.

Kind regards,

Stijn

New Post: Dynamic Custom BitmapSource

MythJuha — Thu, 27 Sep 2012 14:26:03 GMT

Any ideas on this yet? I'm in need of something similar. Think of your ColorKeyBitmap, where i want to dynamically change which color should be used.

Kind regards,

Stijn

New Post: ColorkeyBitmap Test Program - Updating UI

AdamWorld — Wed, 23 Nov 2011 10:01:20 GMT

Hi !

Any Update ?

Best Regards.

New Post: ColorkeyBitmap Test Program - Updating UI

adamworld — Wed, 09 Nov 2011 07:37:26 GMT

Hi !

https://skydrive.live.com/#cid=E514BFD96B4CE2AD&id=E514BFD96B4CE2AD%21103

You can get my Test Program.

Have a Nice Day.

Thank you.

New Post: ColorkeyBitmap Test Program - Updating UI

adamworld — Mon, 07 Nov 2011 10:15:41 GMT

Hi !

I Sent Test Program on Email.

And I am looking forward to the result on my Test Program.

Have a Nice Day.

Thank you.

New Post: ColorkeyBitmap Test Program - Updating UI

DwayneNeed — Fri, 04 Nov 2011 21:32:26 GMT

I don't use gmail much, but I checked my gmail account and there wasn't any message from you.

Please resend your repro to my hotmail account DwayneNeed (_at_) hotmail.com

New Post: ColorkeyBitmap Test Program - Updating UI

adamworld — Fri, 04 Nov 2011 13:13:07 GMT

In Google Gmail box, you can download a test program.

New Post: ColorkeyBitmap Test Program - Updating UI

adamworld — Fri, 04 Nov 2011 01:27:07 GMT

I send test program again.

Sorry.

2011/11/4 DwayneNeed <notifications@codeplex.com>

From: DwayneNeed

Where did you send the test program? Perhaps just paste a link here to skydrive or dropbox?

Read the full discussion online.

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New Post: ColorkeyBitmap Test Program - Updating UI

DwayneNeed — Thu, 03 Nov 2011 18:23:32 GMT

Where did you send the test program? Perhaps just paste a link here to skydrive or dropbox?

New Post: ColorkeyBitmap Test Program - Updating UI

adamworld — Thu, 03 Nov 2011 07:57:37 GMT

Hi !

Thank you for your help.

I send my test program.

Copy at least 5 images to bin/Debug folder then it will work well.

And I commented to let you understand my poor code.

Thank you.

New Post: WritePreamble() before FormatConvertedBitmap?

DwayneNeed — Thu, 03 Nov 2011 03:08:09 GMT

I'm sorry we are miscommunicating. I am NOT asking you to fix any code in my project. I am only asking you to show me your test program (how you are USING my project).

For example, you showed some code like:

if(_nTime % 10 == 0)//. per 10 seconds update Image
{
     BitmapSource bitSrc = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                _hBitmapStaff,
                IntPtr.Zero,
                Int32Rect.Empty,
                BitmapSizeOptions.FromEmptyOptions());

     ColorKeyBitmap colorKeyBmp = new ColorKeyBitmap();
     colorKeyBmp.TransparentColor = Color.FromArgb(255, 255, 255, 255);
     colorKeyBmp.Source = bitSrc;
     img.Source = colorKeyBmp;
}

if(_nTime % 2 == 0)//. per 2 seconds update TextBlock
{
      text.Text = String.Format("{0}", _nTime);
      //text.invalidateVisible();
      //this.invalidateVisible();
}

But this code snippet leaves me with questions:

1) What kind of timer are you creating?
2) What is hBitmapStaff?
3) Is anything else interesting happening?

If you can just zip up your test program and send it to me, I should be able to determine why it is not working.

New Post: WritePreamble() before FormatConvertedBitmap?

adamworld — Thu, 03 Nov 2011 03:04:02 GMT

First, Thank you very much for you production.

I will do my best to contribute to this.

... ... ... ... ...

What I did for my problem is only removing WritePostscript() and Nothing else.

Following Code shows what I did.

in ChainedBitmap.cs

        protected override void CopyPixelsCore(Int32Rect sourceRect, int stride, int bufferSize, IntPtr buffer)
        {
            BitmapSource source = Source;
            BitmapSource convertedSource = source;

            if (source != null)
            {
                PixelFormat sourceFormat = source.Format;
                PixelFormat destinationFormat = Format;

                if (sourceFormat != destinationFormat)
                {
                    // We need a format converter.  Reuse the cached one if
                    // it still matches.
                    if (_formatConverter == null ||
                        _formatConverter.Source != source ||
                        _formatConverter.Format != destinationFormat ||
                        _formatConverterSourceFormat != sourceFormat)
                    {
                        WritePreamble();
                        _formatConverterSourceFormat = sourceFormat;
                        _formatConverter = new FormatConvertedBitmap(source, destinationFormat, Palette, 0);

                        //WritePostscript();//. This Is What I Did. But Think This Is Neccessary.

                    }

                    convertedSource = _formatConverter;
                }

                convertedSource.CopyPixels(sourceRect, buffer, bufferSize, stride);
            }
        }

But even if I want to repro as you mentioned, removing WritePostscript is unsafe i think.

And that Unsatefty make me worry to make error.

So right now I try to do everything to get the reason WHY?

New Post: WritePreamble() before FormatConvertedBitmap?

DwayneNeed — Thu, 03 Nov 2011 02:44:34 GMT

You obviously have some code already, which is where you see this problem. Can't you share it with me?

New Post: WritePreamble() before FormatConvertedBitmap?

adamworld — Thu, 03 Nov 2011 02:39:10 GMT

That's a good idea. Thank you.

But I am not as good as you to do the good job.

Now I really want you to give me a hint where I should update.

Help me.