WPF BitmapImage Memory Usage

Question

I am trying to convert a byte array of an image to BitmapImage to bind to a button.

public static BitmapImage GetBitmapImageFromByteArray(byte[] p_Image)
    {
        try
        {
            BitmapImage bmpImage;
            if (p_Image != null)
            {
                using (MemoryStream msStream = new MemoryStream(p_Image))
                {
                    msStream.Position = 0;
                    bmpImage = GetBitmapImageFromStream(msStream);
                    //msStream.Close();
                    return bmpImage;
                }
            }
        }
        catch
        {
        }
        return null;
    }

Where GetBitmapImageFromStream looks something like this:

public static BitmapImage GetBitmapImageFromStream(MemoryStream msImage)
    {
        try
        {
            if (msImage == null) return null;
                BitmapImage bmpImg = new BitmapImage();
                msImage.Position = 0;
                bmpImg.BeginInit();
                bmpImg.CacheOption = BitmapCacheOption.OnLoad;
                bmpImg.StreamSource = msImage;
                bmpImg.EndInit();
                return bmpImg;

        }
        catch
        {
            return null;
        }
    }

On bmpImg.EndInit(), there is this huge spike in memory. And I have many buttons on my interface which is causing issue. Why this is happening and how can I fix it or how to restore the memory?

Thanks.

While its doesnt solves your problem, but in the GetBitmapImageFromStream function you creates a wrapper stream that isn't referenced in the using statement. — Ben
– Ben, Commented May 26, 2011 at 19:17

Ben · Accepted Answer · 2011-05-26 19:35:38Z

1

From the help my guess is that it creates a copy to cache it, and maybe one copy scaled down to use it on the button. And while the GC doesn't collect all the data that copied into the streams there will be multiple copies in the memory.

answered May 26, 2011 at 19:35

Ben

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7 Comments

user296623 Over a year ago

Ben: With some research, I found what you have mentioned above but trying to figure out how to resolve.

Ben Over a year ago

Can you explain your useage pattern? Where you use the images, how much images, what size they have? If you use a lots of images that always needs to be seen or referenced, than i think you can't avoid a big memory useage especially if you use big images.

user296623 Over a year ago

Each image size is around 45KB. I have 30 custom buttons with each showing 4 images. So, its 120 images in total which can occupy upto 6 - 7 MB memory (120 x 44K). But my application is using about 1.2GB and I get Out of memory exception.

Ben Over a year ago

There must be some bug somewhere, i recenlty wrote an editor to our artists that uses and displays more images(100-200 images with size is around 100-300KB) and its not using more than 250MB of memory. But my images loaded from disk. Maybe there are some reference to your byte array that prevents the GC to collect it? How big that memory spike when you creates a BitmapImage?

user296623 Over a year ago

Its around 5000KB for each image.

|

Ievgen · Accepted Answer · 2013-10-23 22:17:25Z

0

Try to limit your image height. You can set DecodePixelHeight property to BitmapImage. It will take some time to convert you bytes but max height will be limited and memory usage will be reduced.

                var bmpImg = new BitmapImage();
                msImage.Position = 0;
                bmpImg.BeginInit();

                 bmpImg.DecodePixelHeight =containerHeight; 

                bmpImg.CacheOption = BitmapCacheOption.OnLoad;
                bmpImg.StreamSource = msImage;
                bmpImg.EndInit();
                return bmpImg;

P.s. Maybe you will have a memory leak there. http://code.logos.com/blog/2008/04/memory_leak_with_bitmapimage_and_memorystream.html

answered Oct 23, 2013 at 22:17

Ievgen

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