C#中Image , Bitmap 和 BitmapData

 1 [DllImport("gdi32")]
 2 static extern int DeleteObject(IntPtr o);
 3 /// <summary>
 4 /// bitmap转换为bitmapsource 以适应wpf的image
 5 /// </summary>
 6 /// <param name="pic"></param>
 7 /// <returns></returns>
 8 public static BitmapSource GetMapSource(Bitmap pic)
 9 {
10     IntPtr ip = pic.GetHbitmap();
11     BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
12         ip, IntPtr.Zero, Int32Rect.Empty,
13         System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
14     DeleteObject(ip);
15     return bitmapSource;
16 }

 1 /// <summary>
 2 /// 像素点阵转换为bitmap
 3 /// </summary>
 4 /// <param name="rawValues">byte[]数组</param>
 5 /// <param name="width">图片的宽度</param>
 6 /// <param name="height">图片的高度</param>
 7 /// <returns>bitmap图片</returns>
 8 public static Bitmap ToGrayBitmap(byte[] rawValues, int width, int height)
 9 {
10     Bitmap bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
11     BitmapData bmpData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
12     //// 获取图像参数  
13     //bmpData.Stride = width;
14     int stride = bmpData.Stride;  // 扫描线的宽度  
15     int offset = stride - width;  // 显示宽度与扫描线宽度的间隙  
16     IntPtr iptr = bmpData.Scan0;  // 获取bmpData的内存起始位置  
17     int scanBytes = stride * height;// 用stride宽度，表示这是内存区域的大小  
18     //// 下面把原始的显示大小字节数组转换为内存中实际存放的字节数组  
19     int posScan = 0, posReal = 0;// 分别设置两个位置指针，指向源数组和目标数组  
20     byte[] pixelValues = new byte[scanBytes];  //为目标数组分配内存  
21     for (int x = 0; x < height; x++)
22     {
23         //// 下面的循环节是模拟行扫描  
24         for (int y = 0; y < width; y++)
25         {
26             pixelValues[posScan++] = rawValues[posReal++];
27         }
28         posScan += offset;  //行扫描结束，要将目标位置指针移过那段“间隙”  
29     }
30     //// 用Marshal的Copy方法，将刚才得到的内存字节数组复制到BitmapData中  
31     System.Runtime.InteropServices.Marshal.Copy(pixelValues, 0, iptr, scanBytes);
32     bmp.UnlockBits(bmpData);  // 解锁内存区域  
33     //// 下面的代码是为了修改生成位图的索引表，从伪彩修改为灰度  
34     ColorPalette tempPalette;
35     using (Bitmap tempBmp = new Bitmap(1, 1, System.Drawing.Imaging.PixelFormat.Format8bppIndexed))
36     {
37         tempPalette = tempBmp.Palette;
38     }
39     for (int i = 0; i < 256; i++)
40     {
41         tempPalette.Entries[i] = System.Drawing.Color.FromArgb(i, i, i);
42     }
43 
44     bmp.Palette = tempPalette;
45 
46     //// 算法到此结束，返回结果  
47     return bmp;
48 }

 1 //8位位图得到除去文件头信息的一位灰度数组
 2 
 3 
 4 BitmapData bmpData = map.LockBits(new System.Drawing.Rectangle(0, 0, map.Width, map.Height), ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
 5 
 6 //// 获取图像参数  
 7 
 8 int stride = bmpData.Stride;  // 扫描线的宽度  
 9 
10 int offset = stride - map.Width;  // 显示宽度与扫描线宽度的间隙  
11 
12 IntPtr iptr = bmpData.Scan0;  // 获取bmpData的内存起始位置  
13 
14 int scanBytes = stride * map.Height;// 用stride宽度，表示这是内存区域的大小  
15 
16 //// 下面把原始的显示大小字节数组转换为内存中实际存放的字节数组  
17 
18 mapdata = new byte[scanBytes];  //为目标数组分配内存
19 
20 System.Runtime.InteropServices.Marshal.Copy(iptr, mapdata, 0, scanBytes); //copy内存中数据到数组中

public static byte[] GetMapData(byte[] MapData,int width,int height)
{
    var length = MapData.Length;
    if(width==length/height)
    {
        return MapData;
    }
    int offset=length/height-width;
    var scanBytes = width * height;
    byte[] RawMapData = new byte[scanBytes];
    int posScan = 0, posReal = 0;
    for(int x=0;x<height;x++)
    {
        for (int y=0;y<width;y++)
        {
            RawMapData[posScan++] = MapData[posReal++];
        }
        posReal += offset;
    }
    return RawMapData;
}