System.Drawing.Bitmap.GetRenderableContext C# (CSharp) Method

        internal CGBitmapContext GetRenderableContext()
        {
            if (cachedContext != null && cachedContext.Handle != IntPtr.Zero)
                return cachedContext;

            var format = GetBestSupportedFormat (pixelFormat);
            var bitmapContext = CreateCompatibleBitmapContext ((int)NativeCGImage.Width, (int)NativeCGImage.Height, format);

            bitmapContext.DrawImage (new CGRect (0, 0, NativeCGImage.Width, NativeCGImage.Height), NativeCGImage);

            int size = (int)(bitmapContext.BytesPerRow * bitmapContext.Height);
            var provider = new CGDataProvider (bitmapContext.Data, size, true);

            CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
            NativeCGImage = new CGImage ((int)bitmapContext.Width, (int)bitmapContext.Height, (int)bitmapContext.BitsPerComponent,
                                         (int)bitmapContext.BitsPerPixel, (int)bitmapContext.BytesPerRow,
                                         colorSpace,
                                         bitmapContext.AlphaInfo,
                                         provider, null, true, CGColorRenderingIntent.Default);
            colorSpace.Dispose ();
            cachedContext = bitmapContext;

            return cachedContext;
        }