Salut à tous !

J'aurais besoin de votre aide pour comprendre la partie Unsafe de ce code, car je voudrais le traduire en VB.NET :

Code C# : Sélectionner tout - Visualiser dans une fenêtre à part
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        /// <summary>
        /// Replaces any pixel with a zero alpha value with the specified transparency key.
        /// </summary>
        /// <param name="bmpData">The bitmap data in which to perform the operation.</param>
        /// <param name="transKey">The transparency color. This color is rendered transparent
        /// by the DragDropHelper.</param>
        /// <remarks>
        /// This function only supports 32-bit pixel formats for now.
        /// </remarks>
        private static void ReplaceTransparentPixelsWithTransparentKey(BitmapData bmpData, DrawingColor transKey)
        {
            DrawingPixelFormat pxFormat = bmpData.PixelFormat;
 
            if (DrawingPixelFormat.Format32bppArgb == pxFormat
                || DrawingPixelFormat.Format32bppPArgb == pxFormat)
            {
                int transKeyArgb = transKey.ToArgb();
 
                // We will just iterate over the data... we don't care about pixel location,
                // just that every pixel is checked.
                unsafe
                {
                    byte* pscan = (byte*)bmpData.Scan0.ToPointer();
                    {
                        for (int y = 0; y < bmpData.Height; ++y, pscan += bmpData.Stride)
                        {
                            int* prgb = (int*)pscan;
                            for (int x = 0; x < bmpData.Width; ++x, ++prgb)
                            {
                                // If the alpha value is zero, replace this pixel's color
                                // with the transparency key.
                                if ((*prgb & 0xFF000000L) == 0L)
                                    *prgb = transKeyArgb;
                            }
                        }
                    }
                }
            }
            else
            {
                // If it is anything else, we aren't supporting it, but we
                // won't throw, cause it isn't an error
                System.Diagnostics.Trace.TraceWarning("Not converting transparent colors to transparency key.");
                return;
            }
        }