//functional methods
PictureHead ReadPictureHead()
{
PictureHead head = new PictureHead();
if (reader.ReadLine() != "P3")
{
return(null);
}
String line = reader.ReadLine();
if (line.StartsWith("#"))
{
line = reader.ReadLine();
}
string[] xy = Regex.Split(line, " ");
width = int.Parse(xy[0]);
height = int.Parse(xy[1]);
//not used but must be read so only the body remains in reader
string maxColor = reader.ReadLine();
if (height % 8 == 0)
{
head.fillY = 0;
}
else
{
head.fillY = 8 - height % 8;
}
if (width % 8 == 0)
{
head.fillX = 0;
}
else
{
head.fillX = 8 - width % 8;
}
head.pixelMaxY = height + head.fillY;
head.pixelMaxX = width + head.fillX;
return(head);
}
public void PPMtoJpg(string imageSrc, string imagedest)
{
Bitstream bs = new Bitstream();
PlainFormatReader pfr = new PlainFormatReader(imageSrc);
Mathloc ml = new Mathloc();
Picture pic = pfr.ReadPicture();
int height = pic.Head.pixelMaxY;
int width = pic.Head.pixelMaxX;
Color3[,] col3 = new Color3[height, width];
byte[] colors = new byte[3];
//convert RGB to YUV for each pixel
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
col3[y, x] = pic.Data.PictureYX[y, x];
colors[0] = col3[y, x].a; // R
colors[1] = col3[y, x].b; // G
colors[2] = col3[y, x].c; // B
colors = ml.RGBToYUV(colors);
col3[y, x].a = colors[0]; // Y
col3[y, x].b = colors[1]; // U
col3[y, x].c = colors[2]; // V
}
}
//convert float array to byte array
float[,] yArray = new float[width, height]; // width and height vertauscht
float[,] uArray = new float[width, height];
float[,] vArray = new float[width, height];
for (int j = 0; j < height; j++)
{
for (int i = 0; i < width; i++)
{
yArray[i, j] = (float)col3[j, i].a;
uArray[i, j] = (float)col3[j, i].b;
vArray[i, j] = (float)col3[j, i].c;
}
}
byte[,] yArrayEnde = new byte[width, height];
byte[,] uArrayEnde = new byte[width, height];
byte[,] vArrayEnde = new byte[width, height];
//get float [number of 8x8][8x8]
var yarry = aufteilen(yArray);
var uarry = aufteilen(uArray);
var varry = aufteilen(vArray);
//geht beim 40x40 bild 25
for (int y = 0; y < height / 8; y++)
{
for (int x = 0; x < width / 8; x++)
{
//DCTDirect
for (int i = 0; i < ((height * width) / 64); i++)
{
yArray = DCT.DCTdirect(yarry[i]);
uArray = DCT.DCTdirect(uarry[i]);
vArray = DCT.DCTdirect(varry[i]);
}
//convert float array to byte array
byte[,] yArrayB = new byte[width, height];
byte[,] uArrayB = new byte[width, height];
byte[,] vArrayB = new byte[width, height];
for (int i = 0; i < width / 8; i++)
{
for (int j = 0; j < height / 8; j++)
{
yArrayB[i, j] = (byte)yArray[i, j];
uArrayB[i, j] = (byte)uArray[i, j];
vArrayB[i, j] = (byte)vArray[i, j];
}
}
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
yArrayEnde[i * x, j *y] = yArrayB[i, j];
uArrayEnde[i * x, j *y] = uArrayB[i, j];
vArrayEnde[i * x, j *y] = vArrayB[i, j];
}
}
byte[] yArrayB2 = new byte[64];
byte[] uArrayB2 = new byte[64];
byte[] vArrayB2 = new byte[64];
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
yArrayB2[ZigZagTable2[i * j]] = yArrayB[i, j];
uArrayB2[ZigZagTable2[i * j]] = uArrayB[i, j];
vArrayB2[ZigZagTable2[i * j]] = vArrayB[i, j];
}
}
// Create Huffmantables
//yArrayEnde = HuffmanCalc(YDCNodes, YDCValues, yArrayB2);
//yArrayEnde = HuffmanCalc(YDCNodes, YACValues, yArrayB2);
//uArrayEnde = HuffmanCalc(CbDCNodes, CbDCValues, uArrayB2);
//uArrayEnde = HuffmanCalc(CbACNodes, CbACValues, uArrayB2);
//vArrayEnde = HuffmanCalc(CbDCNodes, CbDCValues, vArrayB2);
//vArrayEnde = HuffmanCalc(CbACNodes, CbACValues, vArrayB2);
}
}
//create JPG head
PictureHead.CreateJPGHead(bs, (ushort)height, (ushort)width);
//TODO: DCT
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
bs.AddByte((byte)yArrayEnde[x, y]);
bs.AddByte((byte)uArrayEnde[x, y]);
bs.AddByte((byte)vArrayEnde[x, y]);
}
}
bs.AddShort(0xffd9); //End of Picture Marker
bs.WriteToFile(imagedest);
}