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POHow to properly address 16bpp with pointers in C#
 

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  1. POHow to properly address 16bpp with pointers in C#
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    <p>I am trying to copy camera metadata into a Bitmap, and seing as each value in the metadata is a 16bit (or ushort) I thought it would be sensible to display it in a 16bpp garyscale Bitmap. The code I wrote is as follows:</p> <pre><code>// Getting the metadata from the device metaData = new DepthMetaData(); dataSource.GetMetaData(metaData); // Setting up bitmap, rect and data to use pointer Bitmap bitmap = new Bitmap(metaData.XRes, metaData.YRes, PixelFormat.Format16bppGrayScale); Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height); BitmapData data = bitmap.LockBits(rect, ImageLockMode.WriteOnly, PixelFormat.Format16bppGrayScale); // Pointer pointing to metadata ushort* ptrMetaData = (ushort*)dataSource.DepthMapPtr.ToPointer(); lock(this) { // Runs through the whole bitmap and assigns the entry in the metadata // to a pixel for (int y = 0; y &lt; bitmap.Height; ++y) { ushort* ptrDestination = (ushort*)data.Scan0.ToPointer() + y * data.Stride; for (int x = 0; x &lt; bitmap.Width; ++x, ++ptrMetaData) { ptrDestination[x] = (ushort)*ptrMetaData; } } } // Once done unlock the bitmap so that it can be read again bitmap.UnlockBits(data); </code></pre> <p>When running the Metadata's XRes = 640 and YRes = 480. The code throws a memory access exception in the for-loops on "ptrDestination[x] = (ushort)*ptrMetaData;" after only running though 240, half the total, lines.</p> <p>I used this with 8bpp where I reduced the resolution and it worked nicely, so I don't see why it should not here. Maybe someone finds the problem.</p> <p>Thanks already</p>
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    1. CONB: For 8bpp I used byte instead of ushort and rightshifted the metadata 8 times before assigning to the pixel
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