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//
// System.Drawing.Imaging.ColorPalette.cs
//
// (C) 2002 Ximian, Inc. http://www.ximian.com
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Drawing;
using System.Runtime.InteropServices;
namespace System.Drawing.Imaging
{
public sealed class ColorPalette {
// 0x1: the color values in the array contain alpha information
// 0x2: the color values are grayscale values.
// 0x4: the colors in the array are halftone values.
private int flags;
private Color [] entries;
//
// There is no public constructor, this will be used somewhere in the
// drawing code
//
internal ColorPalette ()
{
entries = new Color [0];
}
internal ColorPalette (int flags, Color[] colors) {
this.flags = flags;
entries = colors;
}
public Color [] Entries {
get {
return entries;
}
}
public int Flags {
get {
return flags;
}
}
/* Caller should call FreeHGlobal*/
internal IntPtr getGDIPalette()
{
GdiColorPalette palette = new GdiColorPalette ();
Color[] entries = Entries;
int entry = 0;
int size = Marshal.SizeOf (palette) + (Marshal.SizeOf (entry) * entries.Length);
IntPtr lfBuffer = Marshal.AllocHGlobal(size);
palette.Flags = Flags;
palette.Count = entries.Length;
int[] values = new int[palette.Count];
for (int i = 0; i < values.Length; i++) {
values[i] = entries[i].ToArgb();
}
Marshal.StructureToPtr (palette, lfBuffer, false);
Marshal.Copy (values, 0, (IntPtr) (lfBuffer.ToInt64() + Marshal.SizeOf (palette)), values.Length);
return lfBuffer;
}
internal void setFromGDIPalette (IntPtr palette)
{
IntPtr ptr = palette;
int cnt, color;
int offset;
flags = Marshal.ReadInt32 (ptr); ptr = (IntPtr) (ptr.ToInt64() + 4);
cnt = Marshal.ReadInt32 (ptr); ptr = (IntPtr) (ptr.ToInt64() + 4);
entries = new Color [cnt];
offset = 0;
for (int i = 0; i < cnt; i++) {
color = Marshal.ReadInt32 (ptr, offset);
entries[i] = Color.FromArgb (color);
offset += 4;
}
}
}
}
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