public System.Drawing.Image ReadImageData(IPNMDataReader dr, int width, int height)
{
try
{
int x, y;
byte val;
Bitmap im;
im = new Bitmap(width, height);
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
//writing 2D matrix of pixles
val = dr.ReadByte();
im.SetPixel(x, y, Color.FromArgb(val, val, val));
}
}
return(im);
}
catch
{
throw;
}
finally
{
dr.Close();
}
}
public PGM(string path)
{
if (!File.Exists(path))
{
return;
}
string line;
int lineNumber = 0;
int byteCount = 0;
StreamReader sr = new StreamReader(path);
while ((line = sr.ReadLine().Trim()) != null)
{
if (line.StartsWith("#"))
{
continue;
}
lineNumber++;
switch (lineNumber)
{
case 1:
binary = line.Equals(P5);
if (binary)
{
reader = new BinaryDataReader(new FileStream(path, FileMode.Open));
}
else
{
reader = new ASCIIDataReader(new FileStream(path, FileMode.Open));
}
break;
case 2:
string[] aux = line.Split(' ');
width = int.Parse(aux[0]);
height = int.Parse(aux[1]);
break;
case 3:
white = int.Parse(line);
break;
default:
return;
}
}
}
public static IPNMDataReader GetIPNMDataReader
(FileStream fs, PNMEncoding encoding)
{
IPNMDataReader dr = null;
switch (encoding)
{
case PNMEncoding.ASCIIEncoding:
dr = new ASCIIDataReader(fs);
break;
case PNMEncoding.BinaryEncoding:
dr = new BinaryDataReader(fs);
break;
}
return(dr);
}
public static System.Drawing.Image ReadPNM(string FilePath)
{
char fchar;
int max, width, height;
string line, ftype;
FileStream fs = new FileStream
(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
/* Read first line, and test if it is propoer PNM type */
line = ((char)fs.ReadByte()).ToString() + ((char)fs.ReadByte()).ToString();
ftype = line;
//read off the endline char
fs.ReadByte();
PNMEncoding encoding = PNMFactory.GetPNMEncoding(ftype);
IPNMDataReader dr = PNMFactory.GetIPNMDataReader(fs, encoding);
if (dr == null)
{
throw new Exception
("Currently only Binary and ASCII encoding is supported");
}
IPNMReader imReader = PNMFactory.GetIPNMReader(PNMFactory.GetPNMType(ftype));
if (imReader == null)
{
throw new Exception
("Currently only PBM, PGM and PNM Image Types are supported");
}
/* Read lines, ignoring those starting with Comment Character, until the
* Image Dimensions are read. */
do
{
//read first char to determine if its a comment
line = dr.ReadLine();
if (line.Length == 0)
{
fchar = '#';
}
else
{
fchar = line.Substring(0, 1).ToCharArray(0, 1)[0];
}
}while(fchar == '#');
string[] toks = line.Split(new char[] { ' ' });
//read height and width
width = int.Parse(toks[0]);
height = int.Parse(toks[1]);
if (ftype != "P1")
{
/* Read lines, ignoring those starting with Comment Character, until the
* maximum pixel value is read. */
do
{
//read first char to determine if its a comment
line = dr.ReadLine();
if (line.Length == 0)
{
fchar = '#';
}
else
{
fchar = line.Substring(0, 1).ToCharArray(0, 1)[0];
}
}while(fchar == '#');
max = int.Parse(line);
if (!(max == 255))
{
Console.WriteLine
("Warning, max value for pixels in this image is not 255");
}
}
return(imReader.ReadImageData(dr, width, height));
}
