System.Windows.Forms.ImageListStreamer.ImageListStreamer C# (CSharp) Méthode

		private ImageListStreamer (SerializationInfo info, StreamingContext context)
		{
			byte [] data = (byte []) info.GetValue ("Data", typeof (byte []));
			if (data == null || data.Length <= 4) { // 4 is the signature
				return;
			}

			// check the signature ( 'MSFt' )
			if (data [0] != 77 || data [1] != 83 || data [2] != 70 || data [3] != 116) {
				return;
			}

			MemoryStream decoded = GetDecodedStream (data, 4, data.Length - 4);
			decoded.Position = 4; // jumps over 'magic' and 'version', which are 16-bits each

			BinaryReader reader = new BinaryReader (decoded);
			ushort nimages = reader.ReadUInt16 ();
			reader.ReadUInt16 ();	// cMaxImage
			ushort grow = reader.ReadUInt16 (); // cGrow
			ushort cx = reader.ReadUInt16 ();
			ushort cy = reader.ReadUInt16 ();
			uint bkcolor = reader.ReadUInt32 ();
			back_color = Color.FromArgb ((int) bkcolor);
			reader.ReadUInt16 ();	// flags

			short [] ovls = new short [4];
			for (int i = 0; i < 4; i++) {
				ovls[i] = reader.ReadInt16 ();
			}

			byte [] decoded_buffer = decoded.GetBuffer ();
			int bmp_offset = 28;
			// FileSize field from the bitmap file header
			int filesize = decoded_buffer [bmp_offset + 2] + (decoded_buffer [bmp_offset + 3] << 8) +
					(decoded_buffer [bmp_offset + 4] << 16) + (decoded_buffer [bmp_offset + 5] << 24);
			// ImageSize field from the info header (can be 0)
			int imagesize = decoded_buffer [bmp_offset + 34] + (decoded_buffer [bmp_offset + 35] << 8) +
					(decoded_buffer [bmp_offset + 36] << 16) + (decoded_buffer [bmp_offset + 37] << 24);

			int bmp_length = imagesize + filesize;
			MemoryStream bmpms = new MemoryStream (decoded_buffer, bmp_offset, bmp_length);
			Bitmap bmp = null;
			Bitmap mask = null;
			bmp = new Bitmap (bmpms);
			MemoryStream mask_stream = new MemoryStream (decoded_buffer,
							bmp_offset + bmp_length,
							(int) (decoded.Length - bmp_offset - bmp_length));

			if (mask_stream.Length > 0)
				mask = new Bitmap (mask_stream);

			if (bkcolor == 0xFFFFFFFF)
				back_color = bmp.GetPixel (0, 0);

			if (mask != null) {
				int width = bmp.Width;
				int height = bmp.Height;
				Bitmap newbmp = new Bitmap (bmp);
				for (int y = 0; y < height; y++) {
					for (int x = 0; x < width; x++) {
						Color mcolor = mask.GetPixel (x, y);
						if (mcolor.B != 0) {
							newbmp.SetPixel (x, y, Color.Transparent);
						}
					}
				}
				bmp.Dispose ();
				bmp = newbmp;
				mask.Dispose ();
				mask = null;
			}
			images = new Image [nimages];
			image_size = new Size (cx, cy);
			Rectangle dest_rect = new Rectangle (0, 0, cx, cy);
			if (grow * bmp.Width > cx) // Some images store a wrong 'grow' factor
				grow = (ushort) (bmp.Width / cx);

			for (int r = 0 ; r < nimages ; r++) {
				int col = r % grow;
				int row = r / grow;
				Rectangle area = new Rectangle (col * cx, row * cy, cx, cy);
				Bitmap b = new Bitmap (cx, cy);
				using (Graphics g = Graphics.FromImage (b)) {
					g.DrawImage (bmp, dest_rect, area, GraphicsUnit.Pixel);
				}

				images [r] = b;
			}
			bmp.Dispose ();
		}