color32.cs

gif图像处理 包括对多帧gif动画的缩放

#region Copyright & License
/*-------------------------New BSD License ------------------
 Copyright (c) 2008, jillzhang
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

* Neither the name of jillzhang nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;

namespace Jillzhang.GifUtility
{
    #region 结构Color32
    /// <summary>
    /// 封装的颜色结构
    /// </summary>
    [StructLayout(LayoutKind.Explicit)]
    internal struct Color32
    {
        /// <summary>
        /// 颜色中的B,位于最低位
        /// </summary>
        [FieldOffset(0)]
        internal byte Blue;

        /// <summary>
        /// 颜色中的G,位于第二位
        /// </summary>
        [FieldOffset(1)]
        internal byte Green;

        /// <summary>
        /// 颜色中的R,位于第三位
        /// </summary>
        [FieldOffset(2)]
        internal byte Red;

        /// <summary>
        /// 颜色中的A,位于第四位
        /// </summary>
        [FieldOffset(3)]
        internal byte Alpha;

        /// <summary>
        /// 颜色的整形值
        /// </summary>
        [FieldOffset(0)]
        internal int ARGB;

        /// <summary>
        /// 颜色
        /// </summary>
        internal Color Color
        {
            get
            {
                return Color.FromArgb(ARGB);
            }
        }

        internal Color32(int c)
        {
            Alpha =0 ;
            Red = 0;
            Green = 0;
            Blue = 0;
            ARGB =c;           
        }
        internal Color32(byte a, byte r, byte g, byte b)
        {
            ARGB = 0;
            Alpha = a;
            Red = r;
            Green = g;
            Blue = b;
        }
    }
    #endregion
}