mcs/class/Managed.Windows.Forms/System.Windows.Forms.RTF/Picture.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24 //
  25
  26
  27 using System;
  28 using System.IO;
  29 using System.Drawing;
  30
  31 namespace System.Windows.Forms.RTF {
  32
  33         internal class Picture {
  34
  35                 private Minor image_type;
  36                 private Image image;
  37                 private MemoryStream data;
  38                 private float width = -1;
  39                 private float height = -1;
  40
  41                 private readonly static float dpix;
  42
  43                 static Picture ()
  44                 {
  45                         Bitmap b = new Bitmap (1, 1);
  46                         Graphics g = Graphics.FromImage (b);
  47                         dpix = g.DpiX;
  48                 }
  49
  50                 public Picture ()
  51                 {
  52
  53                 }
  54
  55                 public Minor ImageType {
  56                         get { return image_type; }
  57                         set { image_type = value; }
  58                 }
  59
  60                 public MemoryStream Data {
  61                         get {
  62                                 if (data == null)
  63                                         data = new MemoryStream ();
  64                                 return data;
  65                         }
  66                 }
  67
  68                 public float Width {
  69                         get {
  70                                 float w = width;
  71                                 if (w == -1) {
  72                                         if (image == null)
  73                                                 image = ToImage ();
  74                                         w = image.Width;
  75                                 }
  76                                 return w;
  77
  78                         }
  79                 }
  80
  81                 public float Height {
  82                         get {
  83                                 float h = height;
  84                                 if (h == -1) {
  85                                         if (image == null)
  86                                                 image = ToImage ();
  87                                         h = image.Height;
  88                                 }
  89                                 return h;
  90                         }
  91                 }
  92
  93                 public SizeF Size {
  94                         get {
  95                                 return new SizeF (Width, Height);
  96                         }
  97                 }
  98
  99                 public void SetWidthFromTwips (int twips)
 100                 {
 101                         width = (int) (((float) twips / 1440.0F) * dpix + 0.5F);
 102                 }
 103
 104                 public void SetHeightFromTwips (int twips)
 105                 {
 106                         height = (int) (((float) twips / 1440.0F) * dpix + 0.5F);
 107                 }
 108
 109                 //
 110                 // Makes sure that we got enough information to actually use the image
 111                 //
 112                 public bool IsValid ()
 113                 {
 114                         if  (data == null)
 115                                 return false;
 116                         switch (image_type) {
 117                         case Minor.PngBlip:
 118                         case Minor.WinMetafile:
 119                                 break;
 120                         default:
 121                                 return false;
 122                         }
 123
 124                         return true;
 125                 }
 126
 127                 public void DrawImage (Graphics dc, float x, float y, bool selected)
 128                 {
 129                         if (image == null)
 130                                 image = ToImage ();
 131
 132                         float height = this.height;
 133                         float width = this.width;
 134
 135                         if (height == -1)
 136                                 height = image.Height;
 137                         if (width == -1)
 138                                 width = image.Width;
 139                         dc.DrawImage (image, x, y, width, height);
 140                 }
 141
 142                 public Image ToImage ()
 143                 {
 144                         return Image.FromStream (data);
 145                 }
 146         }
 147
 148 }
 149