/*Converts a RGB bitmap to YCbCr*/
private void generateYcbcrBitmap(Bitmap uncompressed, ref double[,] Y, ref double[,] Cb, ref double[,] Cr) {
YCbCr[,] ycbcrPixels = new YCbCr[uncompressed.Width, uncompressed.Height];
Color pixel;
RGB rgb = new RGB();
for (int y = 0; y < ycbcrPixels.GetLength(1); y++)
{
for (int x = 0; x < ycbcrPixels.GetLength(0); x++)
{
if (x / 2 >= Cb.GetLength(0) || y / 2 >= Cb.GetLength(1)) continue;
pixel = uncompressed.GetPixel(x, y);
rgb.setRed(pixel.R);
rgb.setGreen(pixel.G);
rgb.setBlue(pixel.B);
ycbcrPixels[x, y] = convertRgbToYCbCr(rgb);
Y[x, y] = ycbcrPixels[x, y].getY();
Cb[x/2,y/2] = ycbcrPixels[x, y].getCb();
Cr[x/2, y/2] = ycbcrPixels[x, y].getCr();
}
}
}
/*Converts YCbCr to RGB*/
private RGB convertYCbCrToRgb(double curY, double curCb, double curCr) {
RGB output = new RGB();
double red = (curY - 16) * 1.164 + (curCb - 128)*0 + (curCr - 128)*1.596;
output.setRed((int)Math.Round(red));
double green = (curY - 16) * 1.164 + (curCb - 128) * -0.392 + (curCr - 128) * -0.813;
output.setGreen((int)green);
double blue = (curY - 16) * 1.164 + (curCb - 128) * 2.017 + (curCr - 128) * 0;
output.setBlue((int)blue);
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;
}
