#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange
//
// Copyright (c) 2005-2017 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.Diagnostics;
using System.IO;
using PdfSharp.Internal;
#if CORE
#endif
#if CORE_WITH_GDI
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
#endif
#if GDI
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
#endif
#if WPF
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
#endif
#if NETFX_CORE
using Windows.UI.Xaml.Media.Imaging;
#endif

namespace PdfSharp.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.");
#if CORE_WITH_GDI || GDI
            if (Source.AssociatedGraphics != null)
            {
                Source.DisassociateWithGraphics();
                Debug.Assert(Source.AssociatedGraphics == null);
            }
            try
            {
                Lock.EnterGdiPlus();
                Source._gdiImage.Save(stream, ImageFormat.Png);
            }
            finally { Lock.ExitGdiPlus(); }
#endif
#if WPF
            DiagnosticsHelper.ThrowNotImplementedException("Save...");
#endif
        }
    }
}