Image.cs :  » PDF » PDF-Clown » it » stefanochizzolini » clown » documents » contents » entities » C# / CSharp Open Source

/*
  Copyright 2006,2007,2008 Stefano Chizzolini. http://clown.stefanochizzolini.it

  Contributors:
    * Stefano Chizzolini (original code developer, http://www.stefanochizzolini.it)

  This file should be part of the source code distribution of "PDF Clown library"
  (the Program): see the accompanying README files for more info.

  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, either expressed or implied; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the License for more details.

  You should have received a copy of the GNU General Public License along with this
  Program (see README files); if not, go to the GNU website (http://www.gnu.org/).

  Redistribution and use, with or without modification, are permitted provided that such
  redistributions retain the above copyright notice, license and disclaimer, along with
  this list of conditions.
*/

using it.stefanochizzolini.clown.bytes;
using it.stefanochizzolini.clown.documents.contents.objects;

using System;
using System.IO;

namespace it.stefanochizzolini.clown.documents.contents.entities{
  /**
    <summary>Abstract image object [PDF:1.6:4.8].</summary>
  */
  public abstract class Image
    : Entity
  {
    #region static
    #region interface
    #region public
    public static Image Get(
      string path
      )
    {
      return Get(
        new FileStream(
          path,
          FileMode.Open,
          FileAccess.Read
          )
        );
    }

    public static Image Get(
      System.IO.Stream stream
      )
    {
      // Get the format identifier!
      byte[] formatMarkerBytes = new byte[2];
      stream.Read(formatMarkerBytes,0,2);

      // Is JPEG?
      /*
        NOTE: JPEG files are identified by a SOI (Start Of Image) marker [ISO 10918-1].
      */
      if(formatMarkerBytes[0] == 0xFF
        && formatMarkerBytes[1] == 0xD8) // JPEG.
      {return new JpegImage(stream);}
      else // Unknown.
      {return null;}
    }
    #endregion
    #endregion
    #endregion

    #region dynamic
    #region fields
    private int bitsPerComponent;
    private int height;
    private int width;

    private System.IO.Stream stream;
    #endregion

    #region constructors
    protected Image(
      System.IO.Stream stream
      )
    {this.stream = stream;}
    #endregion

    #region interface
    #region public
    /**
      <summary>Gets/Sets the number of bits per color component
      [PDF:1.6:4.8.2].</summary>
    */
    public int BitsPerComponent
    {
      get{return bitsPerComponent;}
      protected set{bitsPerComponent = value;}
    }

    /**
      <summary>Gets/Sets the height of the image in samples [PDF:1.6:4.8.2].</summary>
    */
    public int Height
    {
      get{return height;}
      protected set{height = value;}
    }

    /**
      <summary>Gets/Sets the width of the image in samples [PDF:1.6:4.8.2].</summary>
    */
    public int Width
    {
      get{return width;}
      protected set{width = value;}
    }
    #endregion

    #region protected
    /**
      <summary>Gets the underlying stream.</summary>
    */
    protected System.IO.Stream Stream
    {get{return stream;}}
    #endregion
    #endregion
    #endregion
  }
}