Dominant Color Problem Records

void luv2rgb(int *RGB,float *LUV,int size)
{
  int i,k;
  double x,y,X,Y,Z,den,u2,v2,X0,Z0,Y0,u20,v20,vec[3];

  X0 = (0.607+0.174+0.201);
  Y0 = (0.299+0.587+0.114);
  Z0 = (      0.066+1.117);

/* Y0 = 1.0 */
  u20 = 4*X0/(X0+15*Y0+3*Z0);
  v20 = 9*Y0/(X0+15*Y0+3*Z0);

  for (i=0;i<size;i+=3)
  {
    if (LUV[i]>0)
    {
      if (LUV[i]<8.0) Y=((double) LUV[i])/903.3;
      else Y=pow(( ((double) LUV[i]) +16)/116.0,3.0);
      u2=((double) LUV[i+1])/13.0/((double) LUV[i])+u20;
      v2=((double) LUV[i+2])/13.0/((double) LUV[i])+v20;

      den = 6+3*u2-8*v2;
      if (den<0) printf("den<0\n");
      if (den==0) printf("den==0\n");
      x = 4.5*u2/den;
      y = 2.0*v2/den;

      X=x/y*Y;
      Z=(1-x-y)/y*Y;
    }
    else { X=0.0; Y=0.0; Z=0.0; }

    vec[0] = ( 3.240479*X-1.537150*Y-0.498536*Z);
    vec[1] = (-0.969256*X+1.875992*Y+0.041556*Z);
    vec[2] = ( 0.055648*X-0.204043*Y+1.057311*Z);
    for (k=0;k<3;k++)
    {
      if  (vec[k]<=0.018) vec[k] = 255*4.5*vec[k];
      else vec[k] = 255*(1.099*pow(vec[k],0.45)-0.099);
      if (vec[k]>255) vec[k] = 255;
      else if (vec[k]<0) vec[k] = 0;
      RGB[i+k] =floor((float)vec[k]);
    }
  }
}

 整了三天的代码终于出结果了，在这个庞大的代码系中问题就出在了这么一小段的代码的一个函数上，只要把原来的.c文件改成.cpp文件，然后把lroundf改成floor就OK了，佩服自己的耐心。