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 #if !TARGET_JVM
  92         [StructLayout(LayoutKind.Sequential)]
  93 #endif
  94         public sealed class MetafileHeader {
  95
  96                 private MonoMetafileHeader header;
  97
  98                 //constructor
  99
 100                 internal MetafileHeader (IntPtr henhmetafile)
 101                 {
 102                         Marshal.PtrToStructure (henhmetafile, this);
 103                 }
 104
 105                 // methods
 106
 107                 [MonoTODO ("always returns false")]
 108                 public bool IsDisplay ()
 109                 {
 110                         return false;
 111                 }
 112
 113                 public bool IsEmf ()
 114                 {
 115                         return (Type == MetafileType.Emf);
 116                 }
 117
 118                 public bool IsEmfOrEmfPlus ()
 119                 {
 120                         return (Type >= MetafileType.Emf);
 121                 }
 122
 123                 public bool IsEmfPlus ()
 124                 {
 125                         return (Type >= MetafileType.EmfPlusOnly);
 126                 }
 127
 128                 public bool IsEmfPlusDual ()
 129                 {
 130                         return (Type == MetafileType.EmfPlusDual);
 131                 }
 132
 133                 public bool IsEmfPlusOnly ()
 134                 {
 135                         return (Type == MetafileType.EmfPlusOnly);
 136                 }
 137
 138                 public bool IsWmf ()
 139                 {
 140                         return (Type <= MetafileType.WmfPlaceable);
 141                 }
 142
 143                 public bool IsWmfPlaceable ()
 144                 {
 145                         return (Type == MetafileType.WmfPlaceable);
 146                 }
 147
 148                 // properties
 149
 150                 public Rectangle Bounds {
 151                         get { return new Rectangle (header.x, header.y, header.width, header.height); }
 152                 }
 153
 154                 public float DpiX {
 155                         get { return header.dpi_x; }
 156                 }
 157
 158                 public float DpiY {
 159                         get { return header.dpi_y; }
 160                 }
 161
 162                 public int EmfPlusHeaderSize {
 163                         get { return header.emfplus_header_size; }
 164                 }
 165
 166                 public int LogicalDpiX {
 167                         get { return header.logical_dpi_x; }
 168                 }
 169
 170                 public int LogicalDpiY {
 171                         get { return header.logical_dpi_y; }
 172                 }
 173
 174                 public int MetafileSize {
 175                         get { return header.size; }
 176                 }
 177
 178                 public MetafileType Type {
 179                         get { return header.type; }
 180                 }
 181
 182                 public int Version {
 183                         get { return header.version; }
 184                 }
 185
 186                 // note: this always returns a new instance (where we can change
 187                 // properties even if they don't seems to affect anything)
 188                 public MetaHeader WmfHeader {
 189                         get {
 190                                 if (IsWmf ())
 191                                          return new MetaHeader (header.wmf_header);
 192                                 throw new ArgumentException ("WmfHeader only available on WMF files.");
 193                         }
 194                 }
 195         }
 196 }