#region PDFsharp - A .NET library for processing PDF

//

// Authors:

// Stefan Lange

//

// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (Germany)

//

// http://www.PdfSharp.com

// http://sourceforge.net/projects/pdfsharp

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the "Software"),

// to deal in the Software without restriction, including without limitation

// the rights to use, copy, modify, merge, publish, distribute, sublicense,

// and/or sell copies of the Software, and to permit persons to whom the

// Software is furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

// DEALINGS IN THE SOFTWARE.

#endregion

using System;

using System.IO;

namespace PdfSharpCore.Drawing

{

/// <summary>

/// Provides functionality to save a bitmap image in a specific format.

/// </summary>

public abstract class XBitmapEncoder

{

internal XBitmapEncoder()

{

// Prevent external deriving.

}

/// <summary>

/// Gets a new instance of the PNG image encoder.

/// </summary>

public static XBitmapEncoder GetPngEncoder()

{

return new XPngBitmapEncoder();

}

/// <summary>

/// Gets or sets the bitmap source to be encoded.

/// </summary>

public XBitmapSource Source

{

get { return _source; }

set { _source = value; }

}

XBitmapSource _source;

/// <summary>

/// When overridden in a derived class saves the image on the specified stream

/// in the respective format.

/// </summary>

public abstract void Save(Stream stream);

}

internal sealed class XPngBitmapEncoder : XBitmapEncoder

{

internal XPngBitmapEncoder()

{ }

/// <summary>

/// Saves the image on the specified stream in PNG format.

/// </summary>

public override void Save(Stream stream)

{

if (Source == null)

throw new InvalidOperationException("No image source.");

}

}

}