MetafileHeader.cs :  » 2.6.4-mono-.net-core » System.Drawing » System » Drawing » Imaging » C# / CSharp Open Source

//
// System.Drawing.Imaging.MetafileHeader.cs
//
// Author: Everaldo Canuto
// eMail: everaldo.canuto@bol.com.br
// Dennis Hayes (dennish@raytek.com)
//
// (C) 2002 Ximian, Inc.  http://www.ximian.com
// Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
//
// 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.
//

using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;

namespace System.Drawing.Imaging{

  [StructLayout(LayoutKind.Sequential, Pack=2)]
  struct EnhMetafileHeader {
    public int    type;
    public int    size;
    public Rectangle  bounds;
    public Rectangle  frame;
    public int    signature;
    public int    version;
    public int    bytes;
    public int    records;
    public short    handles;
    public short    reserved;
    public int    description;
    public int    off_description;
    public int    palette_entires;
    public Size    device;
    public Size    millimeters;
  }

  // hack: keep public type as Sequential while making it possible to get the required union
  [StructLayout(LayoutKind.Explicit)]
  struct MonoMetafileHeader {
    [FieldOffset (0)]
    public MetafileType  type;
    [FieldOffset (4)]
    public int    size;
    [FieldOffset (8)]
    public int    version;
    [FieldOffset (12)]
    public int    emf_plus_flags;
    [FieldOffset (16)]
    public float    dpi_x;
    [FieldOffset (20)]
    public float    dpi_y;
    [FieldOffset (24)]
    public int    x;
    [FieldOffset (28)]
    public int    y;
    [FieldOffset (32)]
    public int    width;
    [FieldOffset (36)]
    public int    height;
    [FieldOffset (40)]
    public WmfMetaHeader  wmf_header;
    [FieldOffset (40)]
    public EnhMetafileHeader emf_header;
    [FieldOffset (128)]
    public int    emfplus_header_size;
    [FieldOffset (132)]
    public int    logical_dpi_x;
    [FieldOffset (136)]
    public int    logical_dpi_y;
  }

  [MonoTODO ("Metafiles, both WMF and EMF formats, aren't supported.")]
#if !TARGET_JVM
  [StructLayout(LayoutKind.Sequential)]
#endif
  public sealed class MetafileHeader {

    private MonoMetafileHeader header;
    
    //constructor

    internal MetafileHeader (IntPtr henhmetafile)
    {
      Marshal.PtrToStructure (henhmetafile, this);
    }

    // methods

    [MonoTODO ("always returns false")]
    public bool IsDisplay ()
    {
      return false;
    }

    public bool IsEmf ()
    {
      return (Type == MetafileType.Emf);
    }

    public bool IsEmfOrEmfPlus ()
    {
      return (Type >= MetafileType.Emf);
    }

    public bool IsEmfPlus ()
    {
      return (Type >= MetafileType.EmfPlusOnly);
    }

    public bool IsEmfPlusDual ()
    {
      return (Type == MetafileType.EmfPlusDual);
    }

    public bool IsEmfPlusOnly ()
    {
      return (Type == MetafileType.EmfPlusOnly);
    }

    public bool IsWmf ()
    {
      return (Type <= MetafileType.WmfPlaceable);
    }

    public bool IsWmfPlaceable ()
    {
      return (Type == MetafileType.WmfPlaceable);
    }

    // properties

    public Rectangle Bounds {
      get { return new Rectangle (header.x, header.y, header.width, header.height); }
    }

    public float DpiX {
      get { return header.dpi_x; }
    }
    
    public float DpiY {
      get { return header.dpi_y; }
    }
    
    public int EmfPlusHeaderSize {
      get { return header.emfplus_header_size; }
    }

    public int LogicalDpiX {
      get { return header.logical_dpi_x; }
    }
    
    public int LogicalDpiY {
      get { return header.logical_dpi_y; }
    }

    public int MetafileSize {
      get { return header.size; }
    }

    public MetafileType Type {
      get { return header.type; }
    }

    public int Version {
      get { return header.version; }
    }

    // note: this always returns a new instance (where we can change
    // properties even if they don't seems to affect anything)
    public MetaHeader WmfHeader {
      get {
        if (IsWmf ())
           return new MetaHeader (header.wmf_header);
        throw new ArgumentException ("WmfHeader only available on WMF files.");
      }
    }
  }
}