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    <p>You can rotate your cursor using the System.Drawing.Icon class from WinForms in combination with WPF's bitmap rotation ability.</p> <p>The way to do this is to load the icon, convert it to a BitmapSource, use Image and RenderTargetBitmap to rotate it, convert it back to an Icon, save it, and finally update bytes 2, 10, and 11 that make it a .cur instead of a .ico.</p> <p>Here's what the code looks like:</p> <pre><code>public Cursor GetRotatedCursor(byte[] curFileBytes, double rotationAngle) { // Load as Bitmap, convert to BitmapSource var origStream = new MemoryStream(curFileBytes); var origBitmap = new System.Drawing.Icon(origStream).ToBitmap(); var origSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(origBitmap.GetHBitmap()); // Construct rotated image var image = new Image { BitmapSource = origSource, RenderTransform = new RotateTransform(rotationAngle) }; // Render rotated image to RenderTargetBitmap var width = origBitmap.Width; var height = origBitmap.Height; var resultSource = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32); resultSource.Render(image); // Convert to System.Drawing.Bitmap var pixels = new int[width*height]; resultSource.CopyPixels(pixels, width, 0); var resultBitmap = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppPargb); for(int y=0; y&lt;height; y++) for(int x=0; x&lt;width; x++) resultBitmap.SetPixel(x, y, Color.FromArgb(pixels[y*width+x])); // Save to .ico format var resultStream = new MemoryStream(); new System.Drawing.Icon(resultBitmap.GetHIcon()).Save(resultStream); // Convert saved file into .cur format resultStream.Seek(2); resultStream.WriteByte(curFileBytes, 2, 1); resultStream.Seek(10); resultStream.WriteByte(curFileBytes, 10, 2); resultStream.Seek(0); // Construct Cursor return new Cursor(resultStream); } </code></pre> <p>If you want to avoid the loop, you can replace it with a small bit of usafe code to call the System.Drawing.Bitmap constructor that takes initialization data:</p> <pre><code> fixed(int* bits = pixels) { resultBitmap = new System.Drawing.Bitmap(width, height, width, System.Drawing.Imaging.PixelFormat.Format32bppPargb, new IntPtr(bits)); } </code></pre> <p>You'll need to call this every time your TextBox rotation changes. This can be done either from the code that rotates your TextBox, or from a PropertyChangedCallback on a value that is bound to the TextBox's rotation.</p>
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    1. COWow! It works perfectly. Thank you so much for taking the time to write this. Brilliant!
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    2. COYou're welcome. It was a fun little puzzle. I'm glad my code actually worked.
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