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 readonly ImageList.ImageCollection imageCollection;
  45                 private Image [] images;
  46                 private Size image_size;
  47                 private Color back_color;
  48
  49                 internal ImageListStreamer (ImageList.ImageCollection imageCollection) {
  50                         this.imageCollection = imageCollection;
  51                 }
  52
  53                 private ImageListStreamer (SerializationInfo info, StreamingContext context) {
  54
  55                         byte [] data = (byte [])info.GetValue ("Data", typeof (byte []));
  56                         if (data == null || data.Length <= signature.Length)
  57                                 return;
  58                         // check the signature ( 'MSFt' )
  59                         if (data [0] != signature [0] || data [1] != signature [1] ||
  60                                         data [2] != signature [2] ||  data [3] != signature [3])
  61                                 return;
  62
  63                         // calulate size of array needed for decomressed data
  64                         int i = 0;
  65                         int real_byte_count = 0;
  66                         for (i = signature.Length; i < data.Length; i += 2)
  67                                 real_byte_count += data [i];
  68
  69                         if (real_byte_count == 0)
  70                                 return;
  71
  72                         int j = 0;
  73                         byte [] decompressed = new byte [real_byte_count];
  74
  75                         for (i = signature.Length; i < data.Length; i += 2) {
  76                                 for (int k = 0; k < data [i]; k++)
  77                                         decompressed [j++] = data [i + 1];
  78                         }
  79
  80                         MemoryStream stream = new MemoryStream (decompressed);
  81                         BinaryReader reader = new BinaryReader (stream);
  82
  83                         try {
  84                                 // read image list header
  85                                 reader.ReadUInt16 ();   // usMagic
  86                                 reader.ReadUInt16 ();   // usVersion
  87                                 ushort cCurImage = reader.ReadUInt16 ();
  88                                 reader.ReadUInt16 ();   // cMaxImage
  89                                 reader.ReadUInt16 ();   // cGrow
  90                                 ushort cx        = reader.ReadUInt16 ();
  91                                 ushort cy        = reader.ReadUInt16 ();
  92                                 uint   bkcolor   = reader.ReadUInt32 ();
  93                                 reader.ReadUInt16 ();   // flags
  94
  95                                 short [] ovls = new short [4];
  96                                 for (i = 0; i < ovls.Length; i++) {
  97                                         ovls[i] = reader.ReadInt16 ();
  98                                 }
  99
 100                                 image_size = new Size (cx, cy);
 101                                 back_color = Color.FromArgb ((int) bkcolor);
 102
 103                                 MemoryStream start = new MemoryStream (decompressed,
 104                                                 (int) stream.Position,
 105                                                 (int) stream.Length - (int) stream.Position,
 106                                                 false);
 107
 108                                 Image image = Image.FromStream (start);
 109
 110                                 // Holy calamity. This is what happens on MS
 111                                 // if the background colour is 0xFFFFFFFF (CLR_NONE)
 112                                 // the mask is set to the color at pixel 0, 0
 113                                 Bitmap bmp = image as Bitmap;
 114                                 if (bkcolor == 0xFFFFFFFF && bmp != null)
 115                                         back_color = bmp.GetPixel (0, 0);
 116
 117                                 int step = image.Width / cx;
 118                                 images = new Image [cCurImage];
 119
 120                                 Rectangle dest_rect = new Rectangle (0, 0, cx, cy);
 121                                 for (int r = 0 ; r < cCurImage ; r++) {
 122                                         Rectangle area = new Rectangle (
 123                                                 (r % step) * cx,
 124                                                 (r / step) * cy,
 125                                                 cx, cy);
 126                                         Bitmap b = new Bitmap (cx, cy);
 127                                         using (Graphics g = Graphics.FromImage (b)) {
 128                                                 g.DrawImage (image, dest_rect, area,
 129                                                                 GraphicsUnit.Pixel);
 130                                         }
 131                                         b.MakeTransparent (back_color);
 132                                         images [r] = b;
 133                                 }
 134
 135                         } catch (Exception e) {
 136
 137                         }
 138                 }
 139
 140                 [MonoTODO ("RLE is broken")]
 141                 public void GetObjectData (SerializationInfo info, StreamingContext context)
 142                 {
 143                         MemoryStream stream = new MemoryStream ();
 144                         BinaryWriter writer = new BinaryWriter (stream);
 145
 146                         writer.Write (signature);
 147                         writer.Write (GetStreamData ());
 148
 149                         info.AddValue ("Data", stream.ToArray (), typeof (byte []));
 150                 }
 151
 152                 [MonoTODO ("Images should be written to the stream")]
 153                 private byte [] GetStreamData ()
 154                 {
 155                         MemoryStream stream = new MemoryStream ();
 156                         BinaryWriter writer = new BinaryWriter (stream);
 157                         Image [] images = (imageCollection != null) ? imageCollection.ToArray () : this.images;
 158
 159                         int cols = 4;
 160                         int rows = images.Length / cols;
 161                         if (images.Length % cols > 0)
 162                                 ++rows;
 163
 164                         Bitmap main = new Bitmap (cols * ImageSize.Width, rows * ImageSize.Height);
 165                         using (Graphics g = Graphics.FromImage (main)) {
 166                                 g.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (BackColor), 0, 0, cols * ImageSize.Width, rows * ImageSize.Height);
 167                                 for (int i = 0; i < images.Length; i++) {
 168                                         g.DrawImage (images [i], (i % cols) * ImageSize.Width,
 169                                                         (i / cols) * ImageSize.Height);
 170                                 }
 171                         }
 172
 173                         writer.Write ((ushort) (('L' << 8) | 'I'));    // magic
 174                         writer.Write ((ushort) 0x101);                 // version
 175                         writer.Write ((ushort) images.Length);
 176                         writer.Write ((ushort) images.Length);
 177                         writer.Write ((ushort) (rows * cols));
 178                         writer.Write ((ushort) 0x4);                    // grow....not sure this should be hard coded
 179                         writer.Write ((ushort) image_size.Width);
 180                         writer.Write ((ushort) image_size.Height);
 181                         writer.Write (BackColor.ToArgb ());
 182                         writer.Write ((ushort) 0x1009);                // flags
 183
 184                         for (int i = 0; i < 4; i++)
 185                                 writer.Write ((short) -1);  // ovls
 186
 187                         return RLEncodeData (stream.ToArray ());
 188                 }
 189
 190                 // TODO: This is broken
 191                 private byte [] RLEncodeData (byte [] data)
 192                 {
 193                         MemoryStream stream = new MemoryStream ();
 194                         BinaryWriter writer = new BinaryWriter (stream);
 195
 196                         for (int i = 0; i < data.Length; i += 2) {
 197                                 int seq = 0;
 198                                 byte item  = data [i];
 199                                 while (data [i++] == item && i < data.Length)
 200                                         seq++;
 201                                 writer.Write ((byte) seq);
 202                                 writer.Write (item);
 203                         }
 204
 205                         return stream.ToArray ();
 206
 207                 }
 208
 209                 internal Image [] Images {
 210                         get { return images; }
 211                 }
 212
 213                 internal Size ImageSize {
 214                         get { return image_size; }
 215                 }
 216
 217                 internal ColorDepth ColorDepth {
 218                         get { return ColorDepth.Depth32Bit; }
 219                 }
 220
 221                 internal Color BackColor {
 222                         get { return back_color; }
 223                 }
 224         }
 225 }
 226