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#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (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.Collections;
using System.Text;
using System.IO;
#if GDI
using System.Drawing;
using System.Drawing.Imaging;
#endif
#if WPF
using System.Windows.Media;
#endif
using PdfSharp.Drawing;
using PdfSharp.Fonts.TrueType;
using PdfSharp.Internal;
namespace PdfSharp.Pdf.Advanced
{
/// <summary>
/// Represents a PDF soft mask.
/// </summary>
public class PdfSoftMask : PdfDictionary
{
/// <summary>
/// Initializes a new instance of the <see cref="PdfXObject"/> class.
/// </summary>
/// <param name="document">The document that owns the object.</param>
public PdfSoftMask(PdfDocument document)
: base(document)
{
Elements.SetName(Keys.Type, "/Mask");
}
/// <summary>
/// Predefined keys of this dictionary.
/// </summary>
public class Keys : KeysBase
{
/// <summary>
/// (Optional) The type of PDF object that this dictionary describes;
/// if present, must be Mask for a soft-mask dictionary.
/// </summary>
[KeyInfo(KeyType.Name | KeyType.Optional, FixedValue = "Mask")]
public const string Type = "/Type";
/// <summary>
/// (Required) A subtype specifying the method to be used in deriving the mask values
/// from the transparency group specified by the G entry:
/// Alpha: Use the groups computed alpha, disregarding its color.
/// Luminosity: Convert the groups computed color to a single-component luminosity value.
/// </summary>
[KeyInfo(KeyType.Name | KeyType.Required)]
public const string S = "/S";
/// <summary>
/// (Required) A transparency group XObject to be used as the source of alpha
/// or color values for deriving the mask. If the subtype S is Luminosity, the
/// group attributes dictionary must contain a CS entry defining the color space
/// in which the compositing computation is to be performed.
/// </summary>
[KeyInfo(KeyType.Stream | KeyType.Required)]
public const string G = "/G";
/// <summary>
/// (Optional) An array of component values specifying the color to be used
/// as the backdrop against which to composite the transparency group XObject G.
/// This entry is consulted only if the subtype S is Luminosity. The array consists of
/// n numbers, where n is the number of components in the color space specified
/// by the CS entry in the group attributes dictionary.
/// Default value: the color spaces initial value, representing black.
/// </summary>
[KeyInfo(KeyType.Array | KeyType.Optional)]
public const string BC = "/BC";
/// <summary>
/// (Optional) A function object specifying the transfer function to be used in
/// deriving the mask values. The function accepts one input, the computed
/// group alpha or luminosity (depending on the value of the subtype S), and
/// returns one output, the resulting mask value. Both the input and output
/// must be in the range 0.0 to 1.0; if the computed output falls outside this
/// range, it is forced to the nearest valid value. The name Identity may be
/// specified in place of a function object to designate the identity function.
/// Default value: Identity.
/// </summary>
[KeyInfo(KeyType.FunctionOrName | KeyType.Optional)]
public const string TR = "/TR";
}
}
}
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