mcs/class/System.Drawing/System.Drawing.Imaging/ColorPalette.cs

   1 //
   2 // System.Drawing.Imaging.ColorPalette.cs
   3 //
   4 // (C) 2002 Ximian, Inc.  http://www.ximian.com
   5 //
   6 // Author:
   7 //   Miguel de Icaza (miguel@ximian.com)
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Drawing;
  35 using System.Runtime.InteropServices;
  36
  37 namespace System.Drawing.Imaging
  38 {
  39         public sealed class ColorPalette {
  40                 // 0x1: the color values in the array contain alpha information
  41                 // 0x2: the color values are grayscale values.
  42                 // 0x4: the colors in the array are halftone values.
  43
  44                 private int flags;
  45                 private Color [] entries;
  46
  47                 //
  48                 // There is no public constructor, this will be used somewhere in the
  49                 // drawing code
  50                 //
  51                 internal ColorPalette ()
  52                 {
  53                         flags = 0;
  54                         entries = new Color [0];
  55                 }
  56
  57                 internal ColorPalette (int flags, Color[] colors) {
  58                         this.flags = flags;
  59                         entries = colors;
  60                 }
  61
  62                 public Color [] Entries {
  63                         get {
  64                                 return entries;
  65                         }
  66                 }
  67
  68                 public int Flags {
  69                         get {
  70                                 return flags;
  71                         }
  72                 }
  73
  74                 /* Caller should call FreeHGlobal*/
  75                 internal IntPtr getGDIPalette()
  76                 {
  77                         GdiColorPalette palette = new GdiColorPalette ();
  78                         Color[] entries = Entries;
  79                         int entry = 0;
  80                         int size = Marshal.SizeOf (palette) + (Marshal.SizeOf (entry) * entries.Length);
  81                         IntPtr lfBuffer = Marshal.AllocHGlobal(size);
  82
  83                         palette.Flags = Flags;
  84                         palette.Count = entries.Length;
  85
  86                         int[] values = new int[palette.Count];
  87
  88                         for (int i = 0; i < values.Length; i++) {
  89                                 values[i] = entries[i].ToArgb();
  90                                 //Console.Write("{0:X} ;", values[i]);
  91                         }
  92
  93                         //Console.WriteLine("pal size " + Marshal.SizeOf (palette) + " native " + NativeObject);
  94
  95                         Marshal.StructureToPtr (palette, lfBuffer, false);
  96                         Marshal.Copy (values, 0, (IntPtr) (lfBuffer.ToInt32() + Marshal.SizeOf (palette)), values.Length);
  97
  98                         return lfBuffer;
  99                 }
 100
 101                 internal ColorPalette Clone ()
 102                 {
 103                         ColorPalette clone = new ColorPalette ();
 104
 105                         clone.flags = flags;
 106                         clone.entries = new Color [entries.Length];
 107                         for (int i = 0; i < entries.Length; i++)
 108                                 clone.entries [i] = entries [i];
 109
 110                         return clone;
 111                 }
 112
 113                 internal void setFromGDIPalette(IntPtr palette)
 114                 {
 115
 116                 }
 117         }
 118 }