mcs/class/Managed.Windows.Forms/System.Windows.Forms/ImageListStreamer.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) 2002-2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24 //
  25 // Based on work done by:
  26 //   Dennis Hayes (dennish@Raytek.com)
  27 //   Aleksey Ryabchuk (ryabchuk@yahoo.com)
  28
  29 using System.IO;
  30 using System.Drawing;
  31 using System.Collections;
  32 using System.Drawing.Imaging;
  33 using System.Runtime.Serialization;
  34 using System.Runtime.InteropServices;
  35
  36
  37 namespace System.Windows.Forms {
  38
  39         [Serializable]
  40         public sealed class ImageListStreamer : ISerializable {
  41
  42                 private static byte [] signature = new byte [] {77 , 83 , 70 , 116};
  43
  44                 private Image [] images;
  45                 private Size image_size;
  46                 private Color back_color;
  47
  48                 private ImageListStreamer (SerializationInfo info, StreamingContext context) {
  49
  50
  51
  52                         byte [] data = (byte [])info.GetValue ("Data", typeof (byte []));
  53                         if (data == null || data.Length <= signature.Length)
  54                                 return;
  55                         // check the signature ( 'MSFt' )
  56                         if (data [0] != signature [0] || data [1] != signature [1] ||
  57                                         data [2] != signature [2] ||  data [3] != signature [3])
  58                                 return;
  59
  60                         // calulate size of array needed for decomressed data
  61                         int i = 0;
  62                         int real_byte_count = 0;
  63                         for (i = signature.Length; i < data.Length; i += 2)
  64                                 real_byte_count += data [i];
  65
  66                         if (real_byte_count == 0)
  67                                 return;
  68
  69                         int j = 0;
  70                         byte [] decompressed = new byte [real_byte_count];
  71
  72                         for (i = signature.Length; i < data.Length; i += 2) {
  73                                 for (int k = 0; k < data [i]; k++)
  74                                         decompressed [j++] = data [i + 1];
  75                         }
  76
  77                         MemoryStream stream = new MemoryStream (decompressed);
  78                         BinaryReader reader = new BinaryReader (stream);
  79
  80                         IntPtr hbmMask = IntPtr.Zero;
  81                         IntPtr hbmColor= IntPtr.Zero;
  82
  83                         try {
  84                                 // read image list header
  85                                 ushort usMagic   = reader.ReadUInt16 ();
  86                                 ushort usVersion = reader.ReadUInt16 ();
  87                                 ushort cCurImage = reader.ReadUInt16 ();
  88                                 ushort cMaxImage = reader.ReadUInt16 ();
  89                                 ushort cGrow     = reader.ReadUInt16 ();
  90                                 ushort cx        = reader.ReadUInt16 ();
  91                                 ushort cy        = reader.ReadUInt16 ();
  92                                 uint   bkcolor   = reader.ReadUInt32 ();
  93                                 ushort flags     = reader.ReadUInt16 ();
  94
  95                                 short [] ovls = new short [4];
  96                                 for (i = 0; i < ovls.Length; i++)
  97                                         ovls[i] = reader.ReadInt16 ();
  98
  99                                 image_size = new Size (cx, cy);
 100                                 back_color = Color.FromArgb ((int) bkcolor);
 101
 102                                 MemoryStream start = new MemoryStream (decompressed,
 103                                                 (int) stream.Position,
 104                                                 (int) stream.Length - (int) stream.Position,
 105                                                 false);
 106
 107                                 Image image = Image.FromStream (start);
 108
 109                                 // Holy calamity. This is what happens on MS
 110                                 // if the background colour is 0xFFFFFFFF (CLR_NONE)
 111                                 // the mask is set to the color at pixel 0, 0
 112                                 Bitmap bmp = image as Bitmap;
 113                                 if (bkcolor == 0xFFFFFFFF && bmp != null)
 114                                         back_color = bmp.GetPixel (0, 0);
 115
 116                                 int step = image.Width / cx;
 117                                 images = new Image [cCurImage];
 118
 119                                 Rectangle dest_rect = new Rectangle (0, 0, cx, cy);
 120                                 for (int r = 0 ; r < cCurImage ; r++) {
 121                                         Rectangle area = new Rectangle (
 122                                                 (r % step) / cx,
 123                                                 (r / step) * cy,
 124                                                 cx, cy);
 125                                         Bitmap b = new Bitmap (cx, cy);
 126                                         using (Graphics g = Graphics.FromImage (b)) {
 127                                                 g.DrawImage (image, dest_rect, area,
 128                                                                 GraphicsUnit.Pixel);
 129                                         }
 130                                         b.MakeTransparent (back_color);
 131                                         images [r] = b;
 132                                 }
 133
 134                         } catch (Exception e) {
 135
 136                         }
 137                 }
 138
 139                 [MonoTODO]
 140                 void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
 141                 {
 142
 143                 }
 144
 145                 internal Image [] Images {
 146                         get { return images; }
 147                 }
 148
 149                 internal Size ImageSize {
 150                         get { return image_size; }
 151                 }
 152
 153                 internal ColorDepth ImageColorDepth {
 154                         get { return ColorDepth.Depth32Bit; }
 155                 }
 156
 157                 internal Color BackColor {
 158                         get { return back_color; }
 159                 }
 160         }
 161 }
 162