public Bitmap RestoreCbCr(DownsampleFormat df)
{
Bitmap result = new Bitmap(df.bmpWidth, df.bmpHeight);
byte[] data = new byte[df.bmpHeight * df.bmpStride];
int check = 0;
int checkLine = 0;
int cb = df.Cblen;
int cr = df.Crlen;
byte c1, c0;
int j = 0;
for (int i = 0; i < data.Length; i += 3)
{
if (check == 2 || check == 3)
{
c1 = 0;
c0 = 0;
if (check == 3)
{
check = 0;
}
}
else
{
c1 = df.data[j + df.Cblen];
c0 = df.data[j + df.Cblen + df.Crlen];
}
data[i + 2] = df.data[j];
data[i + 1] = c1;
data[i] = c0;
check++;
checkLine += 3;
j++;
if (checkLine == df.bmpWidth * 2)
{
if (check != 0)
{
check = 3;
}
else
{
check = 0;
}
checkLine = 0;
}
}
BitmapData bmData = result.LockBits(new Rectangle(0, 0, result.Width, result.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
Marshal.Copy(data, 0, bmData.Scan0, data.Length);
result.UnlockBits(bmData);
return(result);
}
public Bitmap RestoreBitmap(DownsampleFormat df)
{
if (df.code == 1)
{
return(RestoreCbCr(df));
}
else if (df.code == 2)
{
return(RestoreYCr(df));
}
else
{
return(RestoreYCb(df));
}
}
public DownsampleFormat Downsample(int code)
{
// BGR
byte[] YTemp;
byte[] CbTemp;
byte[] CrTemp;
if (code == 1) // downsample Cb, Cr
{
YTemp = this.YData;
CbTemp = DownsampleChannel(this.CbData);
CrTemp = DownsampleChannel(this.CrData);
}
else if (code == 2)
{
YTemp = DownsampleChannel(this.YData);
CbTemp = this.CbData;
CrTemp = DownsampleChannel(this.CrData);
}
else
{
YTemp = DownsampleChannel(this.YData);
CbTemp = DownsampleChannel(this.CbData);
CrTemp = this.CrData;
}
int Ylen = YTemp.Length;
int Cblen = CbTemp.Length;
int Crlen = CrTemp.Length;
DownsampleFormat result = new DownsampleFormat(this.bmpStride, this.bmpWidth, this.bmpHeight, Ylen, Cblen, Crlen, code);
result.data = new byte[Ylen + Cblen + Crlen];
Array.Copy(YTemp, 0, result.data, 0, Ylen);
Array.Copy(CbTemp, 0, result.data, Ylen, Cblen);
Array.Copy(CrTemp, 0, result.data, Ylen + Cblen, Crlen);
return(result);
}
