public static Bitmap MakeBitmap(PgmImage pgmImage)
{
var width = pgmImage.Width;
var height = pgmImage.Height;
var image = new Bitmap(width, height);
var imageData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
var imageBytes = new byte[Math.Abs(imageData.Stride) * image.Height];
var scan0 = imageData.Scan0;
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
byte pixelColor = pgmImage.Pixels[y][x];
imageBytes[x * 3 + y * imageData.Stride] = pixelColor;
imageBytes[x * 3 + y * imageData.Stride + 2] = pixelColor;
imageBytes[x * 3 + y * imageData.Stride + 1] = pixelColor;
}
}
Marshal.Copy(imageBytes, 0, scan0, imageBytes.Length);
image.UnlockBits(imageData);
return(image);
}
public static PgmImage LoadImage(string file)
{
var ifs = new FileStream(file, FileMode.Open);
var br = new BinaryReader(ifs);
var magic = NextNonCommentLine(br);
if (magic != "P5")
{
throw new Exception("Unknown magic number: " + magic);
}
var widthHeight = NextNonCommentLine(br);
var tokens = widthHeight.Split(' ');
var width = int.Parse(tokens[0]);
var height = int.Parse(tokens[1]);
var sMaxVal = NextNonCommentLine(br);
var maxVal = int.Parse(sMaxVal);
// read width * height pixel values . . .
var pixels = new byte[height][];
for (var i = 0; i < height; ++i)
{
pixels[i] = new byte[width];
}
for (var i = 0; i < height; ++i)
{
for (var j = 0; j < width; ++j)
{
pixels[i][j] = br.ReadByte();
}
}
br.Close();
ifs.Close();
var result = new PgmImage(width, height, maxVal, pixels);
return(result);
}
