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