/*Converts RGB pixel to YCbCr*/
private YCbCr convertRgbToYCbCr(RGB rgb) {
YCbCr output = new YCbCr();
output.setY(16+(rgb.getRed() * 0.257 + rgb.getGreen() * 0.504 + rgb.getBlue() * 0.098));
output.setCb(128+(rgb.getRed() * -0.148 + rgb.getGreen() * -0.291 + rgb.getBlue() * 0.439));
output.setCr(128+(rgb.getRed() * 0.439 + rgb.getGreen() * -0.368 + rgb.getBlue() * -0.071));
return output;
}
/*Converts custom cmpr filetype to bitmap object*/
private Bitmap convertFileToBitmap(string filename) {
byte[] fileByteArray = File.ReadAllBytes(filename);
int byteOffset = 0;
byte[] widthBytes = new byte[4];
byte[] heightBytes = new byte[4];
for (int i=0; i<4; i++) {
widthBytes[i] = fileByteArray[i];
byteOffset++;
heightBytes[i] = fileByteArray[i + 4];
byteOffset++;
}
if (BitConverter.IsLittleEndian)
{
Array.Reverse(widthBytes);
Array.Reverse(heightBytes);
}
int width = BitConverter.ToInt32(widthBytes, 0);
Console.WriteLine("width: {0}", width);
int height = BitConverter.ToInt32(heightBytes, 0);
Console.WriteLine("height: {0}", height);
Bitmap compressedImage = new Bitmap(width, height);
RGB rgb = new RGB();
for (int y=0; y<height; y++) {
for (int x = 0; x < width; x++)
{
rgb.setRed(fileByteArray[byteOffset++]);
rgb.setGreen(fileByteArray[byteOffset++]);
rgb.setBlue(fileByteArray[byteOffset++]);
compressedImage.SetPixel(x, y, Color.FromArgb(rgb.getRed(), rgb.getGreen(), rgb.getBlue()));
}
}
return compressedImage;
}
/*convert YCbCr values to a RGB bitmap*/
private Bitmap generateRgbBitmapFromYCbCr(double[,] Y, double[,] Cb, double[,] Cr)
{
int width = Y.GetLength(0);
int height = Y.GetLength(1);
Bitmap bitmap = new Bitmap(width, height);
Color color;
RGB rgb = new RGB();
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
if (x / 2 >= Cb.GetLength(0) || y / 2 >= Cb.GetLength(1)) continue;
rgb = convertYCbCrToRgb(Y[x,y], Cb[x/2,y/2], Cr[x/2,y/2]);
color = Color.FromArgb(rgb.getRed(),rgb.getGreen(),rgb.getBlue());
bitmap.SetPixel(x, y, color);
}
}
return bitmap;
}
//------------------------------------------------------------------------------------------------------------------
/**
Old code for saving to custom fileType. not useable anymore.
**/
public void oldSavingStuff(double[,] Y) {
int width = Y.GetLength(0);
int height = Y.GetLength(1);
YCbCr[,] ycbcrPixels = new YCbCr[width,height];
Bitmap testBitmap = new Bitmap(width, height);
//testBitmap = generateRgbBitmap(ycbcrPixels);
testBitmap.Save("SubsampledImage.bmp", ImageFormat.Bmp);
byte[] bytesToSave = new byte[width * height * 3 + 8];
int byteOffset = 0;
RGB rgb = new RGB();
byte[] widthBytes = BitConverter.GetBytes(width);
byte[] heightBytes = BitConverter.GetBytes(height);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(widthBytes);
Array.Reverse(heightBytes);
}
//Saving image width to beginning of byte array.
for (int i = 0; i < widthBytes.Length; i++)
{
bytesToSave[byteOffset++] = widthBytes[i];
}
//saving image Height to beginning of byte array.
for (int i = 0; i < heightBytes.Length; i++)
{
bytesToSave[byteOffset++] = heightBytes[i];
}
//Saving image data to byte array.
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
rgb = convertYCbCrToRgb(1,2,3);
bytesToSave[y * width + x + byteOffset++] = (byte)rgb.getRed();
bytesToSave[y * width + x + byteOffset++] = (byte)rgb.getGreen();
bytesToSave[y * width + x + byteOffset] = (byte)rgb.getBlue();
//Debug.WriteLine(uncompressed.GetPixel(x,y));
//Debug.WriteLine(testBitmap.GetPixel(x,y));
}
}
File.WriteAllBytes("TestFile.cmpr", bytesToSave);
}
