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POLoad a large BitmapImage asynchronously
 

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    <p>I'm trying to load a very large image (about 16000x7000 pixel) into a Material, and I've tried to load it asynchronously. My first try was to create a task that loaded the BitmapImage and then use it into the material:</p> <pre><code>var bmp = await System.Threading.Tasks.Task.Run(() =&gt; { BitmapImage img = new BitmapImage(new Uri(path)); ImageBrush brush = new ImageBrush(img); var material = new System.Windows.Media.Media3D.DiffuseMaterial(brush); material.Freeze(); return material; }); BackMaterial = bmp; </code></pre> <p>But what I've found is that the image it is not loaded and expanded into memory until the material is shown (it's the same if I use the ImageBrush directly).</p> <p>I'm trying to avoid that because it freezes my UI, but I haven't found the right way to force the bitmap loadi and decode. If I add a WriteableBitmap the load of the picture is performed inside the Task, but then I'm doubling the amount of memory being used:</p> <pre><code>var bmp = await System.Threading.Tasks.Task.Run(() =&gt; { BitmapImage img = new BitmapImage(new Uri(path)); WriteableBitmap wbmp = new WriteableBitmap(img); ImageBrush brush = new ImageBrush(wbmp); var material = new System.Windows.Media.Media3D.DiffuseMaterial(brush); material.Freeze(); return material; }); BackMaterial = bmp; </code></pre> <p>Is there any way to force the load without doubling it into memory. I also tried to load it with a decoder, but I'm also loading into memory twice:</p> <pre><code>var decoder = BitmapDecoder.Create(new Uri(path), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.None); var frame = decoder.Frames[0]; int stride = frame.PixelWidth * frame.Format.BitsPerPixel / 8; byte[] lines = new byte[frame.PixelHeight * stride]; frame.CopyPixels(lines, stride, 0); var img = BitmapImage.Create( frame.PixelWidth, frame.PixelHeight, frame.DpiX, frame.DpiY, frame.Format, frame.Palette, lines, stride); frame = null; lines = null; </code></pre> <p>Thanks!</p>
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    1. USjmservera
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    1. COTry only creating img in the the task.
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    2. COI've already tried, BitmapImage is created immediately and then, after the task completion, the file is loaded and decoded. I want the load and decode to happen into the Task to allow me to show a Loading animation while decoding the large picture.
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    3. COI am not a WPF guru, but maybe [this thread](http://stackoverflow.com/questions/36748/asynchronously-loading-a-bitmapimage-in-c-sharp-using-wpf) will give you some ideas?
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