// VncSharp - .NET VNC Client Library

// Copyright (C) 2008 David Humphrey

//

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 2 of the License, or

// (at your option) any later version.

//

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

using System.Diagnostics;

using System.Drawing;

using VncSharpCore.Encodings;

namespace VncSharpCore

{

/// <summary>

/// Factory class used to create derived EncodedRectangle objects at runtime based on data sent by VNC Server.

/// </summary>

public class EncodedRectangleFactory

{

private RfbProtocol rfb;

private Framebuffer framebuffer;

/// <summary>

/// Creates an instance of the EncodedRectangleFactory using the connected RfbProtocol object and associated Framebuffer object.

/// </summary>

/// <param name="rfb">An RfbProtocol object that will be passed to any created EncodedRectangle objects. Must be non-null, already initialized, and connected.</param>

/// <param name="framebuffer">A Framebuffer object which will be used by any created EncodedRectangle objects in order to decode and draw rectangles locally.</param>

public EncodedRectangleFactory(RfbProtocol rfb, Framebuffer framebuffer)

{

Debug.Assert(rfb != null, "RfbProtocol object must be non-null");

Debug.Assert(framebuffer != null, "Framebuffer object must be non-null");

this.rfb = rfb;

this.framebuffer = framebuffer;

}

/// <summary>

/// Creates an object type derived from EncodedRectangle, based on the value of encoding.

/// </summary>

/// <param name="rectangle">A Rectangle object defining the bounds of the rectangle to be created</param>

/// <param name="encoding">An Integer indicating the encoding type to be used for this rectangle. Used to determine the type of EncodedRectangle to create.</param>

/// <returns></returns>

public EncodedRectangle Build(Rectangle rectangle, int encoding)

{

EncodedRectangle e;

switch (encoding) {

case RfbProtocol.RAW_ENCODING:

e = new RawRectangle(rfb, framebuffer, rectangle);

break;

case RfbProtocol.COPYRECT_ENCODING:

e = new CopyRectRectangle(rfb, framebuffer, rectangle);

break;

case RfbProtocol.RRE_ENCODING:

e = new RreRectangle(rfb, framebuffer, rectangle);

break;

case RfbProtocol.CORRE_ENCODING:

e = new CoRreRectangle(rfb, framebuffer, rectangle);

break;

case RfbProtocol.HEXTILE_ENCODING:

e = new HextileRectangle(rfb, framebuffer, rectangle);

break;

case RfbProtocol.ZRLE_ENCODING:

e = new ZrleRectangle(rfb, framebuffer, rectangle);

break;

default:

// Sanity check

throw new VncProtocolException("Unsupported Encoding Format received: " + encoding + ".");

}

return e;

}

}

}