commentex.cs

gif图像处理 包括对多帧gif动画的缩放

#region Copyright & License
/*----------------------------------------------------------------
// Copyright (C) 2008 jillzhang 版权所有。 
//  
// 文件名：CommentEx.cs
// 文件功能描述：
// 
// 创建标识：jillzhang 
// 修改标识：
// 修改描述：
//
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//----------------------------------------------------------------*/

/*-------------------------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.IO;

namespace Jillzhang.GifUtility
{
    #region 结构CommentEx
    /// <summary>
    /// 注释扩展(Comment Extension)
    /// 这一部分是可选的（需要89a版本），可以用来记录图形、版权、描述等任何的非图形和控制
    /// 的纯文本数据(7-bit ASCII字符)，注释扩展并不影响对图象数据流的处理，解码器完全可以忽
    /// 略它。存放位置可以是数据流的任何地方，最好不要妨碍控制和数据块，推荐放在数据流的开始或结尾
    /// </summary>
    internal struct CommentEx
    {

        #region 结构字段  
        /// <summary>
        /// Comment Data - 一个或多个数据块组成
        /// </summary>
        internal List<string> CommentDatas;
        #endregion

        #region 方法函数
        internal byte[] GetBuffer()
        {            
            List<byte> list = new List<byte>();
            list.Add(GifExtensions.ExtensionIntroducer);
            list.Add(GifExtensions.CommentLabel);
            foreach (string coment in CommentDatas)
            {
                char[] commentCharArray = coment.ToCharArray();
                list.Add((byte)commentCharArray.Length);
                foreach (char c in commentCharArray)
                {
                    list.Add((byte)c);
                }
            }
            list.Add(GifExtensions.Terminator);
            return list.ToArray();
        }
        #endregion
    }
    #endregion
}