mcs/class/System.Drawing/System.Drawing.Imaging/MetafileHeader.cs

   1 //
   2 // System.Drawing.Imaging.MetafileHeader.cs
   3 //
   4 // Author: Everaldo Canuto
   5 // eMail: everaldo.canuto@bol.com.br
   6 // Dennis Hayes (dennish@raytek.com)
   7 //
   8 // (C) 2002 Ximian, Inc.  http://www.ximian.com
   9 // Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Drawing.Drawing2D;
  32 using System.Runtime.InteropServices;
  33
  34 namespace System.Drawing.Imaging {
  35
  36         [StructLayout(LayoutKind.Sequential, Pack=2)]
  37         struct EnhMetafileHeader {
  38                 public int              type;
  39                 public int              size;
  40                 public Rectangle        bounds;
  41                 public Rectangle        frame;
  42                 public int              signature;
  43                 public int              version;
  44                 public int              bytes;
  45                 public int              records;
  46                 public short            handles;
  47                 public short            reserved;
  48                 public int              description;
  49                 public int              off_description;
  50                 public int              palette_entires;
  51                 public Size             device;
  52                 public Size             millimeters;
  53         }
  54
  55         // hack: keep public type as Sequential while making it possible to get the required union
  56         [StructLayout(LayoutKind.Explicit)]
  57         struct MonoMetafileHeader {
  58                 [FieldOffset (0)]
  59                 public MetafileType     type;
  60                 [FieldOffset (4)]
  61                 public int              size;
  62                 [FieldOffset (8)]
  63                 public int              version;
  64                 [FieldOffset (12)]
  65                 public int              emf_plus_flags;
  66                 [FieldOffset (16)]
  67                 public float            dpi_x;
  68                 [FieldOffset (20)]
  69                 public float            dpi_y;
  70                 [FieldOffset (24)]
  71                 public int              x;
  72                 [FieldOffset (28)]
  73                 public int              y;
  74                 [FieldOffset (32)]
  75                 public int              width;
  76                 [FieldOffset (36)]
  77                 public int              height;
  78                 [FieldOffset (40)]
  79                 public WmfMetaHeader    wmf_header;
  80                 [FieldOffset (40)]
  81                 public EnhMetafileHeader emf_header;
  82                 [FieldOffset (128)]
  83                 public int              emfplus_header_size;
  84                 [FieldOffset (132)]
  85                 public int              logical_dpi_x;
  86                 [FieldOffset (136)]
  87                 public int              logical_dpi_y;
  88         }
  89
  90         [MonoTODO ("Metafiles, both WMF and EMF formats, aren't supported.")]
  91         [StructLayout(LayoutKind.Sequential)]
  92         public sealed class MetafileHeader {
  93
  94                 private MonoMetafileHeader header;
  95
  96                 //constructor
  97
  98                 internal MetafileHeader (IntPtr henhmetafile)
  99                 {
 100                         Marshal.PtrToStructure (henhmetafile, this);
 101                 }
 102
 103                 // methods
 104
 105                 [MonoTODO ("always returns false")]
 106                 public bool IsDisplay ()
 107                 {
 108                         return false;
 109                 }
 110
 111                 public bool IsEmf ()
 112                 {
 113                         return (Type == MetafileType.Emf);
 114                 }
 115
 116                 public bool IsEmfOrEmfPlus ()
 117                 {
 118                         return (Type >= MetafileType.Emf);
 119                 }
 120
 121                 public bool IsEmfPlus ()
 122                 {
 123                         return (Type >= MetafileType.EmfPlusOnly);
 124                 }
 125
 126                 public bool IsEmfPlusDual ()
 127                 {
 128                         return (Type == MetafileType.EmfPlusDual);
 129                 }
 130
 131                 public bool IsEmfPlusOnly ()
 132                 {
 133                         return (Type == MetafileType.EmfPlusOnly);
 134                 }
 135
 136                 public bool IsWmf ()
 137                 {
 138                         return (Type <= MetafileType.WmfPlaceable);
 139                 }
 140
 141                 public bool IsWmfPlaceable ()
 142                 {
 143                         return (Type == MetafileType.WmfPlaceable);
 144                 }
 145
 146                 // properties
 147
 148                 public Rectangle Bounds {
 149                         get { return new Rectangle (header.x, header.y, header.width, header.height); }
 150                 }
 151
 152                 public float DpiX {
 153                         get { return header.dpi_x; }
 154                 }
 155
 156                 public float DpiY {
 157                         get { return header.dpi_y; }
 158                 }
 159
 160                 public int EmfPlusHeaderSize {
 161                         get { return header.emfplus_header_size; }
 162                 }
 163
 164                 public int LogicalDpiX {
 165                         get { return header.logical_dpi_x; }
 166                 }
 167
 168                 public int LogicalDpiY {
 169                         get { return header.logical_dpi_y; }
 170                 }
 171
 172                 public int MetafileSize {
 173                         get { return header.size; }
 174                 }
 175
 176                 public MetafileType Type {
 177                         get { return header.type; }
 178                 }
 179
 180                 public int Version {
 181                         get { return header.version; }
 182                 }
 183
 184                 // note: this always returns a new instance (where we can change
 185                 // properties even if they don't seems to affect anything)
 186                 public MetaHeader WmfHeader {
 187                         get {
 188                                 if (IsWmf ())
 189                                          return new MetaHeader (header.wmf_header);
 190                                 throw new ArgumentException ("WmfHeader only available on WMF files.");
 191                         }
 192                 }
 193         }
 194 }