octreequantizer.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.Drawing;
using System.Drawing.Imaging;

namespace Jillzhang.GifUtility
{
    #region 八叉树颜色量化器OcTreeQuantizer
    /// <summary>
    /// 八叉树颜色量化器
    /// </summary>
    internal class OcTreeQuantizer
    {
        private int maxColors = 0;
        OcTree tree;        
        internal OcTreeQuantizer(int colorDepth)
        {
            if (colorDepth > 8)
            {
                throw new ArgumentOutOfRangeException("colorDepth", colorDepth, "颜色深度不能大于8");
            }
            if (colorDepth <= 0)
            {
                throw new ArgumentOutOfRangeException("colorDepth", colorDepth, "颜色深度不能小于1");
            }
            maxColors = 1 << colorDepth;
            tree = new OcTree(colorDepth);
        }
        internal Color32[] Quantizer(Bitmap bmp)
        {
            BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, bmp.PixelFormat);
            //第一次扫描，扫描整个图像，根据像素值构造八叉树
            FirstPass(bmpData, bmp.Width * bmp.Height);
            Color32[] palltte = tree.Pallette();
            bmp.UnlockBits(bmpData);
            Color32[] list = new Color32[maxColors];
            Array.Copy(palltte, list, palltte.Length);
            for (int i = palltte.Length; i < maxColors-1; i++)
            {
                list[i] = new Color32();
            }
            list[maxColors-1] = new Color32();
            return list;
        }    
        void FirstPass(BitmapData bmpData,int pixelCount)
        {            
            unsafe
            {
                Color32* colorPointer = (Color32*)bmpData.Scan0.ToPointer();              
                for (int i = 0; i < pixelCount; i++)
                {
                    tree.AddColor(colorPointer);
                    colorPointer++;
                }
            }           
        }
    }
    #endregion
}