C # code for parsing the SUM raster file image of RAS files-practical tips

How to use:

Copy Code code as follows:

Imageras _ras = new Imageras (@ "D:\temp\test.ras");
pictureBox1.Image = _ras.image;
_ras.saveras (@ "D:\temp\OK.ras");

I only achieved 24-bit color and 8-bit color This structure is too simple. Only file headers and data areas. is a 8-bit color table with some special
First Red table Green table Blue table is usually RGB, RGB so put this thing incredibly rrrr ... GGG ... B....
I don't know what to think.
There is very little time to do these things in the project. The next target is the IFF file.
All code

Copy Code code as follows:

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 Raster Graphics 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 Private
<summary>
File Header 956aa659
</summary>
Private UINT M_MAGEIC = 0x956aa659;
<summary>
Wide
</summary>
Private UINT m_width = 0;
<summary>
High
</summary>
Private UINT m_height = 0;
<summary>
Color depth
</summary>
Private UINT m_depth = 0;
<summary>
Plot Area data size
</summary>
Private UINT m_length = 0;
<summary>
Data type
</summary>
Private UINT M_type = 0;
<summary>
Color graphic Type
</summary>
Private UINT M_maptype = 0;
<summary>
Color length
</summary>
Private UINT m_maplength = 0;
<summary>
Color table
</summary>
Private color[] m_colorlist = new color[256];
<summary>
Graphics
</summary>
Private Bitmap m_image;
#endregion
<summary>
Get graphics
</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>
Get Data
</summary>
<param name= "P_imagebytes" ></param>
private void LoadImage (byte[] p_imagebytes)
{
if (Bitconverter.touint32 (p_imagebytes, 0)!= m_mageic) throw new Exception ("Incorrect file header!") ");
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>
BYTE conversion to UINT
</summary>
<param name= "P_value" > byte array </param>
<param name= "P_index" > Start position </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>
Get the Inverted bytes
</summary>
<param name= "P_value" ></param>
<returns></returns>
Private byte[] Uinttobytes (UINT p_value)
{
byte[] _valuebytes = bitconverter.getbytes (P_value);
Array.reverse (_valuebytes);
return _valuebytes;
}
<summary>
Get Graphics data
</summary>
<param name= "P_valuebytes" > File stay </param>
<param name= "P_starindex" >rgb left start position </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 ("not implemented!") ");
}
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>
Save graphic
</summary>
<returns></returns>
Private byte[] Saveimageofras ()
{
if (m_image = null) return to 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>
Save Graphics to RAS file
</summary>
<param name= "P_file" ></param>
public void Saveras (string p_file)
{
byte[] _value = Saveimageofras ();
if (_value.length!= 0) file.writeallbytes (p_file, _value);
}
}
}