class/System.Drawing/System.Drawing/BufferedGraphics.cs

   1 //
   2 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 // Authors:
  24 //
  25 //   Jordi Mas i Hernadez <jordimash@gmail.com>
  26 //
  27 //
  28
  29 #if NET_2_0
  30
  31 using System.ComponentModel;
  32 using System.Runtime.InteropServices;
  33 using System.Runtime.Serialization;
  34 using System.Security.Permissions;
  35
  36 namespace System.Drawing
  37 {
  38         public sealed class BufferedGraphics : IDisposable
  39         {
  40                 private Rectangle size;
  41                 private Bitmap membmp = null;
  42                 private Graphics target = null;
  43                 private Graphics source = null;
  44
  45                 private BufferedGraphics ()
  46                 {
  47
  48                 }
  49
  50                 internal BufferedGraphics (Graphics targetGraphics, Rectangle targetRectangle)
  51                 {
  52                         size = targetRectangle;
  53                         target = targetGraphics;
  54                         membmp = new Bitmap (size.Width, size.Height);
  55                 }
  56
  57                 ~BufferedGraphics ()
  58                 {
  59                         Dispose (false);
  60                 }
  61
  62                 public Graphics Graphics {
  63                         get {
  64                                 if (source == null) {
  65                                         source = Graphics.FromImage (membmp);
  66                                 }
  67
  68                                 return source;
  69                         }
  70                 }
  71
  72                 public void Dispose ()
  73                 {
  74                         Dispose (true);
  75                         System.GC.SuppressFinalize (this);
  76                 }
  77
  78                 private void Dispose (bool disposing)
  79                 {
  80                         if (disposing == false)
  81                                 return;
  82
  83                         if (membmp != null) {
  84                                 membmp.Dispose ();
  85                                 membmp = null;
  86                         }
  87
  88                         if (source != null) {
  89                                 source.Dispose ();
  90                                 source = null;
  91                         }
  92
  93                         target = null;
  94                 }
  95
  96                 public void Render ()
  97                 {
  98                         Render (target);
  99                 }
 100
 101                 public void Render (Graphics target)
 102                 {
 103                         if (target == null)
 104                                 return;
 105
 106                         target.DrawImage (membmp, size);
 107                 }
 108
 109                 [MonoTODO ("The targetDC parameter has no equivalent in libgdiplus.")]
 110                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 111                 public void Render (IntPtr targetDC)
 112                 {
 113                         throw new NotImplementedException ();
 114                 }
 115         }
 116 }
 117
 118 #endif