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

/*
  Copyright 2006,2007 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.documents;
using it.stefanochizzolini.clown.files;
using it.stefanochizzolini.clown.objects;

namespace it.stefanochizzolini.clown.documents.contents.colorSpaces{
  /**
    <summary>Color space [PDF:1.6:4.5].</summary>
  */
  public abstract class ColorSpace
    : PdfObjectWrapper<PdfDirectObject>
  {
    #region static
    #region interface
    #region public
    /**
      <summary>Wraps a color space reference into a color space object.</summary>
      <param name="reference">Reference to a color space object.</param>
      <returns>Color space object associated to the reference.</returns>
    */
    public static ColorSpace Wrap(
      PdfReference reference
      )
    {return Wrap(reference,null);}

    /**
      <summary>Wraps a color space base object into a color space object.</summary>
      <param name="baseObject">Base object of a color space object.</param>
      <param name="container">Indirect object possibly containing the color space
      base object.</param>
      <returns>Color space object associated to the base object.</returns>
    */
    public static ColorSpace Wrap(
      PdfDirectObject baseObject,
      PdfIndirectObject container
      )
    {
      /*
        NOTE: This is a factory method for any ColorSpace-derived object.
      */
      if(baseObject == null)
        return null;

      PdfName name;
      // Get the data object corresponding to the color space!
      PdfDataObject baseDataObject = File.Resolve(baseObject);
      // Is it an array?
      /*
        NOTE: [PDF:1.6:4.5.2] A color space is defined by an array object whose
        first element is a name object identifying the color space family. For
        families that do not require parameters, the color space CAN be specified
        simply by the family name itself instead of an array.
      */
      if(baseDataObject is PdfArray) // PdfArray.
      {name = (PdfName)((PdfArray)baseDataObject)[0];}
      else // PdfName (by definition).
      {name = (PdfName)baseDataObject;}

      if(name.Equals(PdfName.DeviceRGB))
        return new DeviceRGBColorSpace(baseObject,container);
      else if(name.Equals(PdfName.DeviceCMYK))
        return new DeviceCMYKColorSpace(baseObject,container);
      else if(name.Equals(PdfName.DeviceGray))
        return new DeviceGrayColorSpace(baseObject,container);
      else if(name.Equals(PdfName.CalRGB))
        return new CalRGBColorSpace(baseObject,container);
      else if(name.Equals(PdfName.CalGray))
        return new CalGrayColorSpace(baseObject,container);
      else if(name.Equals(PdfName.Lab))
        return new LabColorSpace(baseObject,container);
      else if(name.Equals(PdfName.ICCBased))
        return new ICCBasedColorSpace(baseObject,container);
      else
        return null; // Should never happen.
    }
    #endregion
    #endregion
    #endregion

    #region dynamic
    #region constructors
    protected ColorSpace(
      Document context,
      PdfDirectObject baseDataObject
      ) : base(
        context.File,
        baseDataObject
        )
    {}

    protected ColorSpace(
      PdfDirectObject baseObject,
      PdfIndirectObject container
      ) : base(
        baseObject,
        container
        )
    {}
    #endregion

    #region interface
    #region public
    public abstract Color GetColor(
      PdfDirectObject[] components
      );

    public abstract Color GetDefaultColor(
      );
    #endregion
    #endregion
    #endregion
  }
}