2 // System.Drawing.Imaging.ColorPalette.cs
4 // (C) 2002 Ximian, Inc. http://www.ximian.com
7 // Miguel de Icaza (miguel@ximian.com)
11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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:
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
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.
35 using System.Runtime.InteropServices;
37 namespace System.Drawing.Imaging
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.
45 private Color [] entries;
48 // There is no public constructor, this will be used somewhere in the
51 internal ColorPalette ()
54 entries = new Color [0];
57 internal ColorPalette (int flags, Color[] colors) {
62 public Color [] Entries {
74 /* Caller should call FreeHGlobal*/
75 internal IntPtr getGDIPalette()
77 GdiColorPalette palette = new GdiColorPalette ();
78 Color[] entries = Entries;
80 int size = Marshal.SizeOf (palette) + (Marshal.SizeOf (entry) * entries.Length);
81 IntPtr lfBuffer = Marshal.AllocHGlobal(size);
83 palette.Flags = Flags;
84 palette.Count = entries.Length;
86 int[] values = new int[palette.Count];
88 for (int i = 0; i < values.Length; i++) {
89 values[i] = entries[i].ToArgb();
92 Marshal.StructureToPtr (palette, lfBuffer, false);
93 Marshal.Copy (values, 0, (IntPtr) (lfBuffer.ToInt64() + Marshal.SizeOf (palette)), values.Length);
98 internal void setFromGDIPalette (IntPtr palette)
100 IntPtr ptr = palette;
104 flags = Marshal.ReadInt32 (ptr); ptr = (IntPtr) (ptr.ToInt64() + 4);
105 cnt = Marshal.ReadInt32 (ptr); ptr = (IntPtr) (ptr.ToInt64() + 4);
107 entries = new Color [cnt];
110 for (int i = 0; i < cnt; i++) {
111 color = Marshal.ReadInt32 (ptr, offset);
112 entries[i] = Color.FromArgb (color);