UWP WriteableBitmap DPI Info

Question

Our application has rendering logic that depends on the horizontal / vertical image resolutions in dots per inch.

This used to be available as DpiX and DpiY properties in the WriteableBitmap / BitmapSource classes: https://msdn.microsoft.com/en-us/library/system.windows.media.imaging.writeablebitmap.aspx

For UWP, it's gone: https://msdn.microsoft.com/library/windows/apps/br243259

Do the properties exist somewhere else now or are they totally gone?

score 3 · Accepted Answer · answered Mar 22 '16 at 07:44

For UWP, the properties exist in BitmapDecoder class now. Here is a simple code sample about getting DPI information by using this class:

 var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/HelloWorld.png"));
 using (IRandomAccessStream stream = await file.OpenReadAsync())
 {                
     BitmapDecoder decoder = await BitmapDecoder.CreateAsync(BitmapDecoder.PngDecoderId, stream); 
     var DpiX = decoder.DpiX;
     var DpiY = decoder.DpiY;                 
 }

Thank you. This works correctly when retrieved directly from a file. — Erwin Alva, Mar 22 '16 at 19:16

UWP WriteableBitmap DPI Info

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