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#include <math.h> |
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#include "ccolor.h" |
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|
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/* Sharp primary matrix */ |
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float XYZtoSharp[3][3] = { |
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{ 1.2694, -0.0988, -0.1706}, |
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{-0.8364, 1.8006, 0.0357}, |
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{ 0.0297, -0.0315, 1.0018} |
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}; |
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/* inverse Sharp primary matrix */ |
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float XYZfromSharp[3][3] = { |
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{ 0.8156, 0.0472, 0.1372}, |
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{ 0.3791, 0.5769, 0.0440}, |
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{-0.0123, 0.0167, 0.9955} |
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}; |
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|
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C_COLOR c_dfcolor = C_DEFCOLOR; |
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36057L, .0, .0, |
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}; |
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|
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/* Sharp primary matrix */ |
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static const float toSharp[3][3] = { |
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{ 1.2694, -0.0988, -0.1706}, |
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{-0.8364, 1.8006, 0.0357}, |
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{ 0.0297, -0.0315, 1.0018} |
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}; |
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/* inverse Sharp primary matrix */ |
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static const float fromSharp[3][3] = { |
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{ 0.8156, 0.0472, 0.1372}, |
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{ 0.3791, 0.5769, 0.0440}, |
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{-0.0123, 0.0167, 0.9955} |
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}; |
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|
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static void |
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/* convert to sharpened RGB color for low-error operations */ |
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void |
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c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]) |
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{ |
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double xyz[3]; |
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xyz[1] = cieY; |
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xyz[2] = (1. - cin->cx - cin->cy)/cin->cy * cieY; |
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|
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cout[0] = toSharp[0][0]*xyz[0] + toSharp[0][1]*xyz[1] + |
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toSharp[0][2]*xyz[2]; |
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cout[1] = toSharp[1][0]*xyz[0] + toSharp[1][1]*xyz[1] + |
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toSharp[1][2]*xyz[2]; |
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cout[2] = toSharp[2][0]*xyz[0] + toSharp[2][1]*xyz[1] + |
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toSharp[2][2]*xyz[2]; |
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cout[0] = XYZtoSharp[0][0]*xyz[0] + XYZtoSharp[0][1]*xyz[1] + |
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XYZtoSharp[0][2]*xyz[2]; |
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cout[1] = XYZtoSharp[1][0]*xyz[0] + XYZtoSharp[1][1]*xyz[1] + |
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XYZtoSharp[1][2]*xyz[2]; |
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cout[2] = XYZtoSharp[2][0]*xyz[0] + XYZtoSharp[2][1]*xyz[1] + |
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XYZtoSharp[2][2]*xyz[2]; |
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} |
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|
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static double |
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/* convert back from sharpened RGB color */ |
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double |
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c_fromSharpRGB(float cin[3], C_COLOR *cout) |
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{ |
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double xyz[3], sf; |
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|
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xyz[0] = fromSharp[0][0]*cin[0] + fromSharp[0][1]*cin[1] + |
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fromSharp[0][2]*cin[2]; |
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xyz[1] = fromSharp[1][0]*cin[0] + fromSharp[1][1]*cin[1] + |
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fromSharp[1][2]*cin[2]; |
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xyz[2] = fromSharp[2][0]*cin[0] + fromSharp[2][1]*cin[1] + |
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fromSharp[2][2]*cin[2]; |
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xyz[0] = XYZfromSharp[0][0]*cin[0] + XYZfromSharp[0][1]*cin[1] + |
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XYZfromSharp[0][2]*cin[2]; |
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xyz[1] = XYZfromSharp[1][0]*cin[0] + XYZfromSharp[1][1]*cin[1] + |
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XYZfromSharp[1][2]*cin[2]; |
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xyz[2] = XYZfromSharp[2][0]*cin[0] + XYZfromSharp[2][1]*cin[1] + |
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XYZfromSharp[2][2]*cin[2]; |
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sf = 1./(xyz[0] + xyz[1] + xyz[2]); |
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|
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return(xyz[1]); |
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} |
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|
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/* assign arbitrary spectrum */ |
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double |
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c_sset(C_COLOR *clr, double wlmin, double wlmax, const float spec[], int nwl) |
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{ |
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double yval, scale; |
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float va[C_CNSS]; |
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int i, pos, n, imax, wl; |
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double wl0, wlstep; |
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double boxpos, boxstep; |
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/* check arguments */ |
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if ((nwl <= 1) | (spec == NULL) | (wlmin >= C_CMAXWL) | |
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(wlmax <= C_CMINWL) | (wlmin >= wlmax)) |
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return(0.); |
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wlstep = (wlmax - wlmin)/(nwl-1); |
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while (wlmin < C_CMINWL) { |
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wlmin += wlstep; |
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--nwl; ++spec; |
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} |
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while (wlmax > C_CMAXWL) { |
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wlmax -= wlstep; |
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--nwl; |
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} |
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imax = nwl; /* box filter if necessary */ |
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boxpos = 0; |
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boxstep = 1; |
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if (wlstep < C_CWLI) { |
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imax = (wlmax - wlmin)/C_CWLI + 1e-7; |
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boxpos = (wlmin - C_CMINWL)/C_CWLI; |
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boxstep = wlstep/C_CWLI; |
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wlstep = C_CWLI; |
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} |
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scale = 0.; /* get values and maximum */ |
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yval = 0.; |
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pos = 0; |
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for (i = 0; i < imax; i++) { |
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va[i] = 0.; n = 0; |
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while (boxpos < i+.5 && pos < nwl) { |
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va[i] += spec[pos++]; |
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n++; |
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boxpos += boxstep; |
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} |
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if (n > 1) |
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va[i] /= (double)n; |
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if (va[i] > scale) |
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scale = va[i]; |
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else if (va[i] < -scale) |
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scale = -va[i]; |
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yval += va[i] * cie_yf.ssamp[i]; |
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} |
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if (scale <= 1e-7) |
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return(0.); |
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yval /= (double)cie_yf.ssum; |
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scale = C_CMAXV / scale; |
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clr->ssum = 0; /* convert to our spacing */ |
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wl0 = wlmin; |
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pos = 0; |
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for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
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if ((wl < wlmin) | (wl > wlmax)) |
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clr->ssamp[i] = 0; |
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else { |
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while (wl0 + wlstep < wl+1e-7) { |
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wl0 += wlstep; |
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pos++; |
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} |
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if ((wl+1e-7 >= wl0) & (wl-1e-7 <= wl0)) |
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clr->ssamp[i] = scale*va[pos] + .5; |
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else /* interpolate if necessary */ |
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clr->ssamp[i] = .5 + scale / wlstep * |
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( va[pos]*(wl0+wlstep - wl) + |
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va[pos+1]*(wl - wl0) ); |
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clr->ssum += clr->ssamp[i]; |
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} |
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clr->flags = C_CDSPEC|C_CSSPEC; |
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return(yval); |
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} |
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|
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/* check if color is grey */ |
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int |
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c_isgrey(C_COLOR *clr) |
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cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
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if (cmix[i] > scale) |
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scale = cmix[i]; |
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else if (cmix[i] < -scale) |
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scale = -cmix[i]; |
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} |
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scale = C_CMAXV / scale; |
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cres->ssum = 0; |
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cmix[i] = c1->ssamp[i] * c2->ssamp[i]; |
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if (cmix[i] > cmax) |
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cmax = cmix[i]; |
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else if (cmix[i] < -cmax) |
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cmax = -cmix[i]; |
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} |
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cmax /= C_CMAXV; |
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if (!cmax) { |
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cres->flags = C_CDSPEC|C_CSSPEC; |
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c_ccvt(cres, C_CSEFF); /* nasty, but true */ |
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yres = (y1 * y2 * cie_yf.ssum * C_CLPWM) / |
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yres = y1 * y2 * cie_yf.ssum * C_CLPWM / |
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(c1->eff*c1->ssum * c2->eff*c2->ssum) * |
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cres->eff*( cres->ssum*(double)cmax + |
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C_CNSS/2.0*(cmax-1) ); |