mcs/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
  30 using System.ComponentModel;
  31 using System.Runtime.InteropServices;
  32 using System.Runtime.Serialization;
  33 using System.Security.Permissions;
  34
  35 namespace System.Drawing
  36 {
  37         public sealed class BufferedGraphics : IDisposable
  38         {
  39                 private Rectangle size;
  40                 private Bitmap membmp = null;
  41                 private Graphics target = null;
  42                 private Graphics source = null;
  43
  44                 private BufferedGraphics ()
  45                 {
  46
  47                 }
  48
  49                 internal BufferedGraphics (Graphics targetGraphics, Rectangle targetRectangle)
  50                 {
  51                         size = targetRectangle;
  52                         target = targetGraphics;
  53                         membmp = new Bitmap (size.Width, size.Height);
  54                 }
  55
  56                 ~BufferedGraphics ()
  57                 {
  58                         Dispose (false);
  59                 }
  60
  61                 public Graphics Graphics {
  62                         get {
  63                                 if (source == null) {
  64                                         source = Graphics.FromImage (membmp);
  65                                 }
  66
  67                                 return source;
  68                         }
  69                 }
  70
  71                 public void Dispose ()
  72                 {
  73                         Dispose (true);
  74                         System.GC.SuppressFinalize (this);
  75                 }
  76
  77                 private void Dispose (bool disposing)
  78                 {
  79                         if (disposing == false)
  80                                 return;
  81
  82                         if (membmp != null) {
  83                                 membmp.Dispose ();
  84                                 membmp = null;
  85                         }
  86
  87                         if (source != null) {
  88                                 source.Dispose ();
  89                                 source = null;
  90                         }
  91
  92                         target = null;
  93                 }
  94
  95                 public void Render ()
  96                 {
  97                         Render (target);
  98                 }
  99
 100                 public void Render (Graphics target)
 101                 {
 102                         if (target == null)
 103                                 return;
 104
 105                         target.DrawImage (membmp, size);
 106                 }
 107
 108                 [MonoTODO ("The targetDC parameter has no equivalent in libgdiplus.")]
 109                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 110                 public void Render (IntPtr targetDC)
 111                 {
 112                         throw new NotImplementedException ();
 113                 }
 114         }
 115 }
 116