C#解析PCX图形文件..

2009-05-20  新添了两个方法  一个保存  另外支持8位色的PCX

连接　　http://blog.csdn.net/zgke/archive/2009/05/20/4204090.aspx

 

图片来源  ACDESS 3.1 转换出来的PCX文件..

 

其实分析了下....PCX的24位图还真有意思....先相素红--绿--蓝 ..每个元素都是RLE压缩 到.NET下还的做个标记获取一行相素的循环3次.频繁的跳转..PCX24位图也太个性了..

 

 

 

哎..... 我只实现了 24位PCX文件生成 ..有空再写把...

至于PCX 8位 1位这写的读取 有空我也会写下..目前的问题是没有PCX 8位的文件...

 

 

使用方法

 

 Zgke.MyImage.ImageFile.ImagePcx _Pcx = new Zgke.MyImage.ImageFile.ImagePcx(@"C:/temp/6.pcx");
       
            pictureBox1.Image = _Pcx.PcxImage;

 

..超级简单把...

 

全部代码也不多

 

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

namespace Zgke.MyImage.ImageFile
{
/// <summary>
/// PCX操作类
/// zgke@sina.com
/// qq:116149
/// </summary>
public class ImagePcx
{
/// <summary>
/// PCX文件头
/// </summary>
private class PCXHEAD
{
public byte[] m_Data = new byte[128];

/// <summary>
/// 文件头必须为 0A;
/// </summary>
public byte Manufacturer { get { return m_Data[0]; } }
/// <summary>
/// 0：PC Paintbrush 2.5 版 　　2：PC Paintbrush 2.8 版　　5：PC Paintbrush 3.0 版
/// </summary>
public byte Version { get { return m_Data[1]; } set { m_Data[1] = value; } }
/// <summary>
/// 其值为1时表示采用RLE压缩编码的方法
/// </summary>
public byte Encoding { get { return m_Data[2]; } set { m_Data[2] = value; } }
/// <summary>
/// 每个相素的位数
/// </summary>
public byte Bits_Per_Pixel { get { return m_Data[3]; } set { m_Data[3] = value; } }

public ushort Xmin { get { return BitConverter.ToUInt16(m_Data, 4); } set { SetUshort(4, value); } }
public ushort Ymin { get { return BitConverter.ToUInt16(m_Data, 6); } set { SetUshort(6, value); } }
public ushort Xmax { get { return BitConverter.ToUInt16(m_Data, 8); } set { SetUshort(8, value); } }
public ushort Ymax { get { return BitConverter.ToUInt16(m_Data, 10); } set { SetUshort(10, value); } }
/// <summary>
/// 水平分辨率
/// </summary>
public ushort Hres1 { get { return BitConverter.ToUInt16(m_Data, 12); } set { SetUshort(12, value); } }
/// <summary>
/// 垂直分辨率
/// </summary>
public ushort Vres1 { get { return BitConverter.ToUInt16(m_Data, 14); } set { SetUshort(14, value); } }

public byte[] Palette
{
get
{
byte[] _Palette = new byte[48];
Array.Copy(m_Data,16,_Palette,0,48);
return _Palette;
}
set
{
if(value.Length!=48)throw new Exception("错误的byte[]长度不是48");
Array.Copy(value, 0, m_Data, 16, 48);
}

}
/// <summary>
/// 位知
/// </summary>
public byte Reserved { get { return m_Data[64]; } set { m_Data[64] = value; } }
/// <summary>
/// 未知
/// </summary>
public byte Colour_Planes { get { return m_Data[65]; } set { m_Data[65] = value; } }
/// <summary>
/// 解码缓冲区
/// </summary>
public ushort Bytes_Per_Line { get { return BitConverter.ToUInt16(m_Data, 66); } set { SetUshort(66, value); } }
/// <summary>
/// 位知
/// </summary>
public ushort Palette_Type { get { return BitConverter.ToUInt16(m_Data, 68); } set { SetUshort(68, value); } }
/// <summary>
/// 填充
/// </summary>
public byte[] Filler
{
get
{
byte[] m_Bytes = new byte[58];
Array.Copy(m_Data, 70, m_Bytes, 0, 58);
return m_Bytes;
}
}

public PCXHEAD(byte[] p_Data)
{
Array.Copy(p_Data, m_Data, 128);
}

public PCXHEAD()
{
m_Data[0] = 0xA;
Version = 0x5;
Encoding = 0x1;
Bits_Per_Pixel = 0x8;
Palette = new byte[] { 0x00, 0x00, 0xCD, 0x00, 0x90, 0xE7, 0x37, 0x01, 0x80, 0xF6, 0x95, 0x7C, 0x28, 0xFB, 0x95, 0x7C, 0xFF, 0xFF, 0xFF, 0xFF, 0x23, 0xFB, 0x95, 0x7C, 0xB3, 0x16, 0x34, 0x7C, 0x00, 0x00, 0xCD, 0x00, 0x00, 0x00, 0x00, 0x00, 0xB8, 0x16, 0x34, 0x7C, 0x64, 0xF3, 0x37, 0x01, 0xD8, 0x54, 0xB8, 0x00 };
Reserved = 0x01;
Colour_Planes = 0x03;
Palette_Type = 1;
}

public int Width { get { return Xmax - Xmin + 1; } }

public int Height { get { return Ymax - Ymin + 1; } }

/// <summary>
/// 设置16位数据保存到数据表
/// </summary>
/// <param name="p_Index">索引</param>
/// <param name="p_Data">数据</param>
private void SetUshort(int p_Index, ushort p_Data)
{
byte[] _ValueBytes = BitConverter.GetBytes(p_Data);
m_Data[p_Index] = _ValueBytes[0];
m_Data[p_Index + 1] = _ValueBytes[1];
}
}

private PCXHEAD m_Head = new PCXHEAD();

private Bitmap m_Image;

/// <summary>
/// 获取图形
/// </summary>
public Bitmap PcxImage { get { return m_Image; } set { m_Image = value; } }

public ImagePcx(string p_FileFullName)
{
if (!File.Exists(p_FileFullName)) return;
Load(File.ReadAllBytes(p_FileFullName));
}

public ImagePcx(byte[] p_Data)
{
Load(p_Data);
}

public ImagePcx()
{

}

/// <summary>
/// 开始获取数据
/// </summary>
/// <param name="p_Bytes">PCX文件信息</param>
private void Load(byte[] p_Bytes)
{
byte[] _Bytes = p_Bytes;
if (_Bytes[0] != 0x0A) return;
m_Head = new PCXHEAD(_Bytes);
m_ReadIndex = 128;
PixelFormat _PixFormate = PixelFormat.Format24bppRgb;
if (m_Head.Colour_Planes == 1) _PixFormate = PixelFormat.Format8bppIndexed;

m_Image = new Bitmap(m_Head.Width, m_Head.Height, _PixFormate);
BitmapData _Data = m_Image.LockBits(new Rectangle(0, 0, m_Image.Width, m_Image.Height), ImageLockMode.ReadWrite, _PixFormate);
byte[] _BmpData = new byte[_Data.Stride * _Data.Height];

for (int i = 0; i != m_Head.Height; i++)
{
byte[] _RowColorValue=new byte[0];
switch (m_Head.Colour_Planes)
{
case 3: //24位
_RowColorValue = LoadPCXLine24(_Bytes);
break;
case 1: //256色
_RowColorValue = LoadPCXLine8(_Bytes);
break;
}
int _Count = _RowColorValue.Length;
Array.Copy(_RowColorValue, 0, _BmpData, i * _Data.Stride, _Count);
}
Marshal.Copy(_BmpData, 0, _Data.Scan0, _BmpData.Length);
m_Image.UnlockBits(_Data);

switch (m_Head.Colour_Planes)
{
case 1:
ColorPalette _Palette = m_Image.Palette;
m_ReadIndex = p_Bytes.Length - 256 * 3;
for (int i = 0; i != 256; i++)
{
_Palette.Entries[i] = Color.FromArgb(p_Bytes[m_ReadIndex], p_Bytes[m_ReadIndex + 1], p_Bytes[m_ReadIndex + 2]);
m_ReadIndex += 3;
}
m_Image.Palette = _Palette;
break;
}
}

/// <summary>
/// 保存成PCX文件
/// </summary>
/// <param name="p_FileFullName">完成路径</param>
public void Save(string p_FileFullName)
{
if (m_Image == null) return;
m_Head.Xmax = (ushort)(m_Image.Width - 1);
m_Head.Ymax = (ushort)(m_Image.Height - 1);
m_Head.Vres1 = (ushort)(m_Head.Xmax + 1);
m_Head.Hres1 = (ushort)(m_Head.Ymax + 1);
m_Head.Bytes_Per_Line = (ushort)m_Head.Width;

MemoryStream _SaveData = new MemoryStream();

switch (m_Image.PixelFormat)
{
#region 8位
case PixelFormat.Format8bppIndexed:
m_Head.Colour_Planes = 1;
BitmapData _ImageData = m_Image.LockBits(new Rectangle(0, 0, m_Head.Width, m_Head.Height), ImageLockMode.ReadOnly, m_Image.PixelFormat);
byte[] _ImageByte = new byte[_ImageData.Stride * _ImageData.Height];
Marshal.Copy(_ImageData.Scan0, _ImageByte, 0, _ImageByte.Length);
m_Image.UnlockBits(_ImageData);

m_SaveIndex = 0;
byte[] _RowBytes = SavePCXLine8(_ImageByte);
_SaveData.Write(_RowBytes, 0, _RowBytes.Length);

_SaveData.WriteByte(0x0C);
for (int i = 0; i != 256; i++)
{
_SaveData.WriteByte((byte)m_Image.Palette.Entries[i].R);
_SaveData.WriteByte((byte)m_Image.Palette.Entries[i].G);
_SaveData.WriteByte((byte)m_Image.Palette.Entries[i].B);
}
break;
#endregion
#region 其他都按24位保存
default:
m_Head.Colour_Planes = 3;
Bitmap _Bitamp24 = new Bitmap(m_Head.Width, m_Head.Height, PixelFormat.Format24bppRgb);
Graphics _Graphics = Graphics.FromImage(_Bitamp24);
_Graphics.DrawImage(m_Image, 0, 0, m_Head.Width, m_Head.Height);
_Graphics.Dispose();
BitmapData _ImageData24 = _Bitamp24.LockBits(new Rectangle(0, 0, m_Head.Width, m_Head.Height), ImageLockMode.ReadOnly, _Bitamp24.PixelFormat);
byte[] _ImageByte24 = new byte[_ImageData24.Stride * _ImageData24.Height];
Marshal.Copy(_ImageData24.Scan0, _ImageByte24, 0, _ImageByte24.Length);
_Bitamp24.UnlockBits(_ImageData24);
m_SaveIndex = 0;
for (int i = 0; i != _ImageData24.Height; i++)
{
byte[] _RowBytes24 = SavePCXLine24(_ImageByte24);
_SaveData.Write(_RowBytes24, 0, _RowBytes24.Length);
}
_SaveData.WriteByte(0x0C);
_SaveData.Write(new byte[768], 0, 768);

break;
#endregion
}
FileStream _FileStream = new FileStream(p_FileFullName, FileMode.Create, FileAccess.Write);
_FileStream.Write(m_Head.m_Data, 0, 128);
byte[] _FileData = _SaveData.ToArray();
_FileStream.Write(_FileData, 0, _FileData.Length);
_FileStream.Close();
}

#region 取数据行
/// <summary>
/// 读取标记
/// </summary>
private int m_ReadIndex = 0;
/// <summary>
/// 获取PCX一行信息 24位色
/// </summary>
/// <param name="p_Data">数据</param>
/// <returns>BMP的行信息</returns>
private byte[] LoadPCXLine24(byte[] p_Data)
{
int _LineWidth = m_Head.Bytes_Per_Line;
byte[] _ReturnBytes = new byte[_LineWidth * 3];
int _EndBytesLength = p_Data.Length - 1;
int _WriteIndex = 2;
int _ReadIndex = 0;
while (true)
{
if (m_ReadIndex > _EndBytesLength) break; //判断行扫描结束返回码
byte _Data = p_Data[m_ReadIndex];

if (_Data > 0xC0)
{
int _Count = _Data - 0xC0;
m_ReadIndex++;
for (int i = 0; i != _Count; i++)
{
if (i + _ReadIndex >= _LineWidth)          //2009-6-12 RLE数据 会换行
{
_WriteIndex--;
_ReadIndex = 0;
_Count = _Count - i;
i = 0;
}
int _RVA = ((i + _ReadIndex) * 3) + _WriteIndex;
_ReturnBytes[_RVA] = p_Data[m_ReadIndex];
}
_ReadIndex += _Count;
m_ReadIndex++;
}
else
{
int _RVA = (_ReadIndex * 3) + _WriteIndex;
_ReturnBytes[_RVA] = _Data;
m_ReadIndex++;
_ReadIndex++;
}
if (_ReadIndex >= _LineWidth)
{
_WriteIndex--;
_ReadIndex = 0;
}

if (_WriteIndex == -1) break;
}
return _ReturnBytes;
}
/// <summary>
/// 获取PCX一行信息 8位色
/// </summary>
/// <param name="p_Data">数据</param>
/// <returns>BMP的行信息</returns>
private byte[] LoadPCXLine8(byte[] p_Data)
{
int _LineWidth = m_Head.Bytes_Per_Line;
byte[] _ReturnBytes = new byte[_LineWidth];
int _EndBytesLength = p_Data.Length - 1 - (256 * 3);         //数据行不够就不执行了。。
int _ReadIndex = 0;
while (true)
{
if (m_ReadIndex > _EndBytesLength) break; //判断行扫描结束返回码

byte _Data = p_Data[m_ReadIndex];
if (_Data > 0xC0)
{
int _Count = _Data - 0xC0;
m_ReadIndex++;
for (int i = 0; i != _Count; i++)
{
_ReturnBytes[i + _ReadIndex] = p_Data[m_ReadIndex];
}
_ReadIndex += _Count;
m_ReadIndex++;
}
else
{
_ReturnBytes[_ReadIndex] = _Data;
m_ReadIndex++;
_ReadIndex++;
}
if (_ReadIndex >= _LineWidth) break;
}
return _ReturnBytes;
}
#endregion

#region 存数据行
private int m_SaveIndex = 0;
/// <summary>
/// 返回PCX8位色数据
/// </summary>
/// <param name="p_Data">原始数据</param>
/// <returns>数据</returns>
private byte[] SavePCXLine8(byte[] p_Data)
{
MemoryStream _Memory = new MemoryStream();
byte  _Value = p_Data[m_SaveIndex];
byte _Count = 1;
for (int i = 1; i != p_Data.Length; i++)
{
byte _Temp = p_Data[m_SaveIndex+i];
if (_Temp == _Value)
{
_Count++;
if (_Count == 63)
{
_Memory.WriteByte(0xFF);
_Memory.WriteByte(_Value);
_Count = 0;
}
}
else
{
if (_Count == 1 && _Value< 0xC0 && _Value!=0x00)
{
_Memory.WriteByte(_Value);
}
else
{
_Memory.WriteByte((byte)(0xC0 + _Count));
_Memory.WriteByte(_Value);
}
_Count = 1;
_Value = _Temp;
}
}
if (_Count == 1 && _Value < 0xC0 && _Value != 0x00)
{
_Memory.WriteByte(_Value);
}
else
{
_Memory.WriteByte((byte)(0xC0 + _Count));
_Memory.WriteByte(_Value);
}
return _Memory.ToArray();
}
/// <summary>
/// 返回24位色数据
/// </summary>
/// <param name="p_Data">原始数据</param>
/// <returns>数据</returns>
private byte[] SavePCXLine24(byte[] p_Data)
{
MemoryStream _Read = new MemoryStream();
MemoryStream _Green = new MemoryStream();
MemoryStream _Blue = new MemoryStream();

for (int i = 0; i != m_Head.Width; i++)
{
_Read.WriteByte(p_Data[m_SaveIndex+2]);
_Green.WriteByte(p_Data[m_SaveIndex+1]);
_Blue.WriteByte(p_Data[m_SaveIndex]);
m_SaveIndex += 3;
}

MemoryStream _All = new MemoryStream();
int _OleIndex = m_SaveIndex;
m_SaveIndex = 0;
byte[] _Bytes = SavePCXLine8(_Read.ToArray());
_All.Write(_Bytes, 0, _Bytes.Length);
m_SaveIndex = 0;
_Bytes = SavePCXLine8(_Green.ToArray());
_All.Write(_Bytes, 0, _Bytes.Length);
m_SaveIndex = 0;
_Bytes = SavePCXLine8(_Blue.ToArray());
_All.Write(_Bytes, 0, _Bytes.Length);
m_SaveIndex = _OleIndex;
return _All.ToArray();
}
#endregion

}
}