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                         dpix = TextRenderer.GetDpi ().Width;
  46                 }
  47
  48                 public Picture ()
  49                 {
  50
  51                 }
  52
  53                 public Minor ImageType {
  54                         get { return image_type; }
  55                         set { image_type = value; }
  56                 }
  57
  58                 public MemoryStream Data {
  59                         get {
  60                                 if (data == null)
  61                                         data = new MemoryStream ();
  62                                 return data;
  63                         }
  64                 }
  65
  66                 public float Width {
  67                         get {
  68                                 float w = width;
  69                                 if (w == -1) {
  70                                         if (image == null)
  71                                                 image = ToImage ();
  72                                         w = image.Width;
  73                                 }
  74                                 return w;
  75
  76                         }
  77                 }
  78
  79                 public float Height {
  80                         get {
  81                                 float h = height;
  82                                 if (h == -1) {
  83                                         if (image == null)
  84                                                 image = ToImage ();
  85                                         h = image.Height;
  86                                 }
  87                                 return h;
  88                         }
  89                 }
  90
  91                 public SizeF Size {
  92                         get {
  93                                 return new SizeF (Width, Height);
  94                         }
  95                 }
  96
  97                 public void SetWidthFromTwips (int twips)
  98                 {
  99                         width = (int) (((float) twips / 1440.0F) * dpix + 0.5F);
 100                 }
 101
 102                 public void SetHeightFromTwips (int twips)
 103                 {
 104                         height = (int) (((float) twips / 1440.0F) * dpix + 0.5F);
 105                 }
 106
 107                 //
 108                 // Makes sure that we got enough information to actually use the image
 109                 //
 110                 public bool IsValid ()
 111                 {
 112                         if  (data == null)
 113                                 return false;
 114                         switch (image_type) {
 115                         case Minor.PngBlip:
 116                         case Minor.WinMetafile:
 117                                 break;
 118                         default:
 119                                 return false;
 120                         }
 121
 122                         return true;
 123                 }
 124
 125                 public void DrawImage (Graphics dc, float x, float y, bool selected)
 126                 {
 127                         if (image == null)
 128                                 image = ToImage ();
 129
 130                         float height = this.height;
 131                         float width = this.width;
 132
 133                         if (height == -1)
 134                                 height = image.Height;
 135                         if (width == -1)
 136                                 width = image.Width;
 137                         dc.DrawImage (image, x, y, width, height);
 138                 }
 139
 140                 public Image ToImage ()
 141                 {
 142                         // Reset the data stream position to the beginning
 143                         data.Position = 0;
 144                         return Image.FromStream (data);
 145                 }
 146         }
 147
 148 }
 149