C# 解析 Targa文件 (TGA) 图形

使用方法

  ImageTGA _Tga = new ImageTGA();

            Bitmap _Bitmap = new Bitmap(124, 234);

            this.DrawToBitmap(_Bitmap, new Rectangle(0, 0, 124, 234));

            _Tga.Image = _Bitmap;

            _Tga.SaveImage(@"C:/1.tga");

 

 

保存的时候只实现了非RLE的 8位 24位 32位 有需要的自己改写下 SaveImageToTGA方法,不多说了 代码不到300行

 

using System;using System.Collections.Generic;using System.IO;using System.Text;using System.Drawing;using System.Drawing.Imaging;using System.Runtime.InteropServices;namespace Zgke.MyImage.ImageFile{ /// <summary> /// Targa文件 /// [e-mail] /// qq:116149 /// </summary> public class ImageTGA { public ImageTGA() { } public ImageTGA(string p_FileFullName) { if (System.IO.File.Exists(p_FileFullName)) { LoadData(File.ReadAllBytes(p_FileFullName)); } } #region 属性 /// <summary> /// ID区域大小 默认为0 /// </summary> private byte m_IDSize = 0; /// <summary> /// 色彩表类型 默认为0 /// </summary> private byte m_ColorTableType = 0; /// <summary> /// 色彩表类型 默认为2 /// </summary> private byte m_ImageType = 2; /// <summary> /// 色彩表类型开始位置 /// </summary> private ushort m_ColorTableIndex = 0; /// <summary> /// 色彩表长度 /// </summary> private ushort m_ColorTableCount = 0; /// <summary> /// 色彩表大小 /// </summary> private byte m_ColorTableSize = 24; /// <summary> /// 色彩表类型开始位置 /// </summary> private ushort m_ImageX = 0; /// <summary> /// 色彩表长度 /// </summary> private ushort m_ImageY = 0; /// <summary> /// 色彩表类型开始位置 /// </summary> private ushort m_ImageWidth = 0; /// <summary> /// 色彩表长度 /// </summary> private ushort m_ImageHeight = 0; /// <summary> /// 每像素位数 /// </summary> private byte m_PixSize = 0; /// <summary> /// 描述占位符 /// </summary> private byte m_Remark = 0; /// <summary> /// 读的位置 /// </summary> private uint m_ReadIndex = 0; /// <summary> /// 图形 /// </summary> private Bitmap m_Image; #endregion /// <summary> /// 图形 /// </summary> public Bitmap Image { get { return m_Image; } set { m_Image = value; if (value != null) { switch (value.PixelFormat) { case PixelFormat.Format8bppIndexed: m_ColorTableType = 1; m_ImageType = 1; m_ColorTableCount = 256; m_PixSize = 8; m_Remark = 32; break; case PixelFormat.Format32bppArgb: m_ColorTableType = 0; m_ImageType = 2; m_ColorTableCount = 0; m_PixSize = 32; m_Remark = 32; break; default: m_ColorTableType = 0; m_ImageType = 2; m_ColorTableCount = 0; m_PixSize = 24; m_Remark = 32; break; } m_ImageWidth = (ushort)value.Width; m_ImageHeight = (ushort)value.Height; } } } /// <summary> /// 获取数据 /// </summary> /// <param name="p_TGABytes"></param> private void LoadData(byte[] p_TGABytes) { m_IDSize = p_TGABytes[0]; m_ColorTableType = p_TGABytes[1]; m_ImageType = p_TGABytes[2]; m_ColorTableIndex = BitConverter.ToUInt16(p_TGABytes, 3); m_ColorTableCount = BitConverter.ToUInt16(p_TGABytes, 5); m_ColorTableSize = p_TGABytes[7]; m_ImageX = BitConverter.ToUInt16(p_TGABytes, 8); m_ImageY = BitConverter.ToUInt16(p_TGABytes, 10); m_ImageWidth = BitConverter.ToUInt16(p_TGABytes, 12); m_ImageHeight = BitConverter.ToUInt16(p_TGABytes, 14); m_PixSize = p_TGABytes[16]; m_Remark = p_TGABytes[17]; m_ReadIndex = 18; LoadImage(p_TGABytes); } private void LoadImage(byte[] p_TAGBytes) { switch (m_PixSize) { case 24: m_Image = new Bitmap(m_ImageWidth, m_ImageHeight, PixelFormat.Format24bppRgb); LoadImageNotRLE(p_TAGBytes, 3); break; case 32: m_Image = new Bitmap(m_ImageWidth, m_ImageHeight, PixelFormat.Format24bppRgb); LoadImageNotRLE(p_TAGBytes, 4); break; case 8: m_Image = new Bitmap(m_ImageWidth, m_ImageHeight, PixelFormat.Format8bppIndexed); ColorPalette _Palette = m_Image.Palette; for (int i = 0; i != m_ColorTableCount; i++) { _Palette.Entries[i] = Color.FromArgb(255, p_TAGBytes[m_ReadIndex + 2], p_TAGBytes[m_ReadIndex + 1], p_TAGBytes[m_ReadIndex]); m_ReadIndex += 3; } m_Image.Palette = _Palette; LoadImageNotRLE(p_TAGBytes, 1); break; } } /// <summary> /// 获取非RLE压缩的图形 /// </summary> /// <param name="p_TagBytes"></param> /// <param name="p_Size"></param> private void LoadImageNotRLE(byte[] p_TagBytes, int p_Size) { int _Index = 0; PixelFormat _Format = PixelFormat.Format24bppRgb; switch (p_Size) { case 3: _Format = PixelFormat.Format24bppRgb; break; case 4: _Format = PixelFormat.Format32bppArgb; break; case 1: _Format = PixelFormat.Format8bppIndexed; break; } BitmapData _ImageData = m_Image.LockBits(new Rectangle(0, 0, m_ImageWidth, m_ImageHeight), ImageLockMode.ReadWrite, _Format); byte[] _ValueBytes = new byte[_ImageData.Stride * _ImageData.Height]; for (int i = 0; i != _ImageData.Height; i++) { _Index = _ImageData.Stride * i; Array.Copy(p_TagBytes, m_ReadIndex, _ValueBytes, _Index, _ImageData.Width * p_Size); m_ReadIndex += (uint)_ImageData.Width * (uint)p_Size; } Marshal.Copy(_ValueBytes, 0, _ImageData.Scan0, _ValueBytes.Length); m_Image.UnlockBits(_ImageData); } /// <summary> /// 保存图形为TGA /// </summary> /// <returns></returns> private byte[] SaveImageToTGA() { if (m_Image == null) return null; MemoryStream _ImageMemory = new MemoryStream(); _ImageMemory.WriteByte(m_IDSize); _ImageMemory.WriteByte(m_ColorTableType); _ImageMemory.WriteByte(m_ImageType); _ImageMemory.Write(BitConverter.GetBytes(m_ColorTableIndex), 0, 2); _ImageMemory.Write(BitConverter.GetBytes(m_ColorTableCount), 0, 2); _ImageMemory.WriteByte(m_ColorTableSize); _ImageMemory.Write(BitConverter.GetBytes(m_ImageX), 0, 2); _ImageMemory.Write(BitConverter.GetBytes(m_ImageY), 0, 2); _ImageMemory.Write(BitConverter.GetBytes(m_ImageWidth), 0, 2); _ImageMemory.Write(BitConverter.GetBytes(m_ImageHeight), 0, 2); _ImageMemory.WriteByte(m_PixSize); _ImageMemory.WriteByte(m_Remark); int _ColorSize = 0; Bitmap _SaveBitmap = m_Image; switch (_SaveBitmap.PixelFormat) { case PixelFormat.Format24bppRgb: _ColorSize = 3; break; case PixelFormat.Format8bppIndexed: _ColorSize = 1; for (int i = 0; i != m_ColorTableCount; i++) { _ImageMemory.WriteByte(m_Image.Palette.Entries[i].B); _ImageMemory.WriteByte(m_Image.Palette.Entries[i].G); _ImageMemory.WriteByte(m_Image.Palette.Entries[i].R); } break; case PixelFormat.Format32bppArgb: _ColorSize = 4; break; default: _SaveBitmap = new Bitmap(m_Image.Width, m_Image.Height, PixelFormat.Format24bppRgb); Graphics _Graphics = Graphics.FromImage(_SaveBitmap); _Graphics.DrawImage(m_Image, new Rectangle(0, 0, _SaveBitmap.Width, _SaveBitmap.Height)); _Graphics.Dispose(); _ColorSize = 3; break; } BitmapData _ImageData = _SaveBitmap.LockBits(new Rectangle(0, 0, _SaveBitmap.Width, _SaveBitmap.Height), ImageLockMode.ReadWrite, _SaveBitmap.PixelFormat); byte[] _ValueBytes = new byte[_ImageData.Stride * _ImageData.Height]; Marshal.Copy(_ImageData.Scan0, _ValueBytes, 0, _ValueBytes.Length); _SaveBitmap.UnlockBits(_ImageData); int _Index = 0; for (int i = 0; i != _ImageData.Height; i++) { _Index = _ImageData.Stride * i; _ImageMemory.Write(_ValueBytes, _Index, _ColorSize * _ImageData.Width); } return _ImageMemory.ToArray(); } /// <summary> /// 保存图形到文件 /// </summary> /// <param name="p_FileFullName"></param> public void SaveImage(string p_FileFullName) { byte[] _ValueBytes = SaveImageToTGA(); if (_ValueBytes != null) File.WriteAllBytes(p_FileFullName, _ValueBytes); } }}