C# 解析 RAS文件 SUM 光栅文件图象的代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
namespace Zgke.MyImage.ImageFile
{
/// <summary>
/// SUN光栅图形 RAS
/// zgke@sina.com
/// qq:116149
/// </summary>
public class ImageRas
{
public ImageRas(string p_ImageFile)
{
if (System.IO.File.Exists(p_ImageFile))
{
LoadImage(System.IO.File.ReadAllBytes(p_ImageFile));
}
}
public ImageRas()
{
}
#region 私有
/// <summary>
/// 文件头 956AA659
/// </summary>
private uint m_Mageic = 0x956AA659;
/// <summary>
/// 宽
/// </summary>
private uint m_Width = 0;
/// <summary>
/// 高
/// </summary>
private uint m_Height = 0;
/// <summary>
/// 颜色深
/// </summary>
private uint m_Depth = 0;
/// <summary>
/// 图形区域数据大小
/// </summary>
private uint m_Length = 0;
/// <summary>
/// 数据类型
/// </summary>
private uint m_Type = 0;
/// <summary>
/// 色彩图形类型
/// </summary>
private uint m_MapType = 0;
/// <summary>
/// 色彩长度
/// </summary>
private uint m_MapLength = 0;
/// <summary>
/// 颜色表
/// </summary>
private Color[] m_ColorList = new Color[256];
/// <summary>
/// 图形
/// </summary>
private Bitmap m_Image;
#endregion
/// <summary>
/// 获取图形
/// </summary>
public Bitmap Image
{
get
{
return m_Image;
}
set
{
if (value != null)
{
m_Image = value;
m_Width = (uint)value.Width;
m_Height = (uint)value.Height;
switch (value.PixelFormat)
{
case PixelFormat.Format8bppIndexed:
break;
case PixelFormat.Format32bppArgb:
break;
default:
m_Depth = 24;
break;
}
}
}
}
/// <summary>
/// 获取数据
/// </summary>
/// <param></param>
private void LoadImage(byte[] p_ImageBytes)
{
if (BitConverter.ToUInt32(p_ImageBytes, 0) != m_Mageic) throw new Exception("文件头不正确！");
m_Width = BytesToUint(p_ImageBytes, 4);
m_Height = BytesToUint(p_ImageBytes, 8);
m_Depth = BytesToUint(p_ImageBytes, 12);
m_Length = BytesToUint(p_ImageBytes, 16);
m_Type = BytesToUint(p_ImageBytes, 20);
m_MapType = BytesToUint(p_ImageBytes, 24);
m_MapLength = BytesToUint(p_ImageBytes, 28);
int _StarIndex = 32;
switch (m_MapType)
{
case 1:
int _ColorTable = (int)m_MapLength / 3;
for (int i = 0; i != _ColorTable; i++)
{
m_ColorList[i] = Color.FromArgb(p_ImageBytes[_StarIndex], p_ImageBytes[_StarIndex + _ColorTable], p_ImageBytes[_StarIndex + (_ColorTable * 2)]);
_StarIndex++;
}
_StarIndex += _ColorTable * 2;
break;
default:
break;
}
LoadData(p_ImageBytes, _StarIndex);
}
/// <summary>
/// 字节转换为UINT
/// </summary>
/// <param>字节数组</param>
/// <param>开始位置</param>
/// <returns></returns>
private uint BytesToUint(byte[] p_Value, int p_Index)
{
byte[] _ValueBytes = new byte[4];
_ValueBytes[0] = p_Value[p_Index + 3];
_ValueBytes[1] = p_Value[p_Index + 2];
_ValueBytes[2] = p_Value[p_Index + 1];
_ValueBytes[3] = p_Value[p_Index];
return BitConverter.ToUInt32(_ValueBytes, 0);
}
/// <summary>
/// 获取反转的BYTES
/// </summary>
/// <param></param>
/// <returns></returns>
private byte[] UintToBytes(uint p_Value)
{
byte[] _ValueBytes = BitConverter.GetBytes(p_Value);
Array.Reverse(_ValueBytes);
return _ValueBytes;
}
/// <summary>
/// 获取图形数据
/// </summary>
/// <param>文件留</param>
/// <param>RGB留开始位置</param>
private void LoadData(byte[] p_ValueBytes, int p_StarIndex)
{
PixelFormat _Format = PixelFormat.Format24bppRgb;
switch (m_Depth)
{
case 8:
_Format = PixelFormat.Format8bppIndexed;
break;
case 24:
_Format = PixelFormat.Format24bppRgb;
break;
default:
throw new Exception("未实现！");
}
m_Image = new Bitmap((int)m_Width, (int)m_Height, _Format);
BitmapData _Data = m_Image.LockBits(new Rectangle(0, 0, m_Image.Width, m_Image.Height), ImageLockMode.ReadWrite, m_Image.PixelFormat);
byte[] _WriteBytes = new byte[_Data.Height * _Data.Stride];
int _StarIndex = 0;
int _WriteIndex = 0;
for (int i = 0; i != _Data.Height; i++)
{
_WriteIndex = i * _Data.Stride;
_StarIndex = i * ((int)m_Length / (int)m_Height) + p_StarIndex;
for (int z = 0; z != _Data.Width; z++)
{
switch (m_Depth)
{
case 8:
_WriteBytes[_WriteIndex] = p_ValueBytes[_StarIndex];
_WriteIndex++;
_StarIndex++;
break;
case 24:
_WriteBytes[_WriteIndex] = p_ValueBytes[_StarIndex + 2];
_WriteBytes[_WriteIndex + 1] = p_ValueBytes[_StarIndex + 1];
_WriteBytes[_WriteIndex + 2] = p_ValueBytes[_StarIndex];
_WriteIndex += 3;
_StarIndex += 3;
break;
}
}
}
switch (m_Depth)
{
case 8:
ColorPalette _Palette = m_Image.Palette;
for (int i = 0; i != m_ColorList.Length; i++)
{
_Palette.Entries[i] = m_ColorList[i];
}
m_Image.Palette = _Palette;
break;
default:
break;
}
Marshal.Copy(_WriteBytes, 0, _Data.Scan0, _WriteBytes.Length);
m_Image.UnlockBits(_Data);
}
/// <summary>
/// 保存图形
/// </summary>
/// <returns></returns>
private byte[] SaveImageOfRas()
{
if (m_Image == null) return new byte[0];
MemoryStream _Stream = new MemoryStream();
_Stream.Write(BitConverter.GetBytes(m_Mageic), 0, 4);
_Stream.Write(UintToBytes(m_Width), 0, 4);
_Stream.Write(UintToBytes(m_Height), 0, 4);
switch (m_Depth)
{
case 8:
BitmapData _Data256 = m_Image.LockBits(new Rectangle(0, 0, m_Image.Width, m_Image.Height), ImageLockMode.ReadOnly, m_Image.PixelFormat);
byte[] _DataBytes = new byte[_Data256.Stride * _Data256.Height];
int _Stride = _Data256.Stride;
Marshal.Copy(_Data256.Scan0, _DataBytes, 0, _DataBytes.Length);
m_Image.UnlockBits(_Data256);
_Stream.Write(UintToBytes(8), 0, 4);
uint _WidthCount = (uint)m_Image.Width;
if (m_Image.Width % 2 != 0) _WidthCount = (uint)m_Image.Width + 1;
uint _AllCount = _WidthCount * (uint)m_Image.Height;
_Stream.Write(UintToBytes(_AllCount), 0, 4);
_Stream.Write(UintToBytes(0), 0, 4);
_Stream.Write(UintToBytes(1), 0, 4);
_Stream.Write(UintToBytes(768), 0, 4);
byte[] _RedBytes = new byte[256];
byte[] _GreenBytes = new byte[256];
byte[] _BlueBytes = new byte[256];
for (int i = 0; i != 256; i++)
{
_RedBytes[i] = m_Image.Palette.Entries[i].R;
_GreenBytes[i] = m_Image.Palette.Entries[i].G;
_BlueBytes[i] = m_Image.Palette.Entries[i].B;
}
_Stream.Write(_RedBytes, 0, _RedBytes.Length);
_Stream.Write(_GreenBytes, 0, _GreenBytes.Length);
_Stream.Write(_BlueBytes, 0, _BlueBytes.Length);
byte[] _Write = new byte[_WidthCount];
for (int i = 0; i != m_Image.Height; i++)
{
Array.Copy(_DataBytes, i * _Stride, _Write, 0, _WidthCount);
_Stream.Write(_Write, 0, _Write.Length);
}
break;
default:
Bitmap _NewBitmap = new Bitmap(m_Image.Width, m_Image.Height, PixelFormat.Format24bppRgb);
Graphics _Graphics = Graphics.FromImage(_NewBitmap);
_Graphics.DrawImage(m_Image, new Rectangle(0, 0, m_Image.Width, m_Image.Height));
_Graphics.Dispose();
BitmapData _Data24 = _NewBitmap.LockBits(new Rectangle(0, 0, _NewBitmap.Width, _NewBitmap.Height), ImageLockMode.ReadOnly, _NewBitmap.PixelFormat);
byte[] _DataBytes24 = new byte[_Data24.Stride * _Data24.Height];
int _Stride24 = _Data24.Stride;
Marshal.Copy(_Data24.Scan0, _DataBytes24, 0, _DataBytes24.Length);
_NewBitmap.UnlockBits(_Data24);
_Stream.Write(UintToBytes(24), 0, 4);
uint _WidthCount24 = (uint)_NewBitmap.Width;
if (_NewBitmap.Width % 2 != 0) _WidthCount24 = (uint)_NewBitmap.Width + 1;
uint _AllCount24 = _WidthCount24 * (uint)_NewBitmap.Height * 3;
_WidthCount24 = _WidthCount24 * 3;
_Stream.Write(UintToBytes(_AllCount24), 0, 4);
_Stream.Write(UintToBytes(0), 0, 4);
_Stream.Write(UintToBytes(0), 0, 4);
_Stream.Write(UintToBytes(0), 0, 4);
byte[] _Write24 = new byte[0];
for (int i = 0; i != m_Image.Height; i++)
{
_Write24 = new byte[_WidthCount24];
int _WriteIndex = 0;
int _StarIndex = i * _Stride24;
for (int z = 0; z != m_Image.Width; z++)
{
_Write24[_WriteIndex] = _DataBytes24[_StarIndex + 2];
_Write24[_WriteIndex + 1] = _DataBytes24[_StarIndex + 1];
_Write24[_WriteIndex + 2] = _DataBytes24[_StarIndex];
_WriteIndex += 3;
_StarIndex += 3;
}
_Stream.Write(_Write24, 0, _Write24.Length);
}
_NewBitmap.Dispose();
break;
}
byte[] _Return = _Stream.ToArray();
return _Return;
}
/// <summary>
/// 保存图形到RAS文件
/// </summary>
/// <param></param>
public void SaveRas(string p_File)
{
byte[] _Value = SaveImageOfRas();
if (_Value.Length != 0) File.WriteAllBytes(p_File, _Value);
}
}
}