--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/lcms2/src/cmspcs.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,965 @@
+//---------------------------------------------------------------------------------
+//
+//  Little Color Management System
+//  Copyright (c) 1998-2023 Marti Maria Saguer
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the Software
+// is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+//---------------------------------------------------------------------------------
+//
+
+#include "lcms2_internal.h"
+
+//      inter PCS conversions XYZ <-> CIE L* a* b*
+/*
+
+
+       CIE 15:2004 CIELab is defined as:
+
+       L* = 116*f(Y/Yn) - 16                     0 <= L* <= 100
+       a* = 500*[f(X/Xn) - f(Y/Yn)]
+       b* = 200*[f(Y/Yn) - f(Z/Zn)]
+
+       and
+
+              f(t) = t^(1/3)                     1 >= t >  (24/116)^3
+                     (841/108)*t + (16/116)      0 <= t <= (24/116)^3
+
+
+       Reverse transform is:
+
+       X = Xn*[a* / 500 + (L* + 16) / 116] ^ 3   if (X/Xn) > (24/116)
+         = Xn*(a* / 500 + L* / 116) / 7.787      if (X/Xn) <= (24/116)
+
+
+
+       PCS in Lab2 is encoded as:
+
+              8 bit Lab PCS:
+
+                     L*      0..100 into a 0..ff byte.
+                     a*      t + 128 range is -128.0  +127.0
+                     b*
+
+             16 bit Lab PCS:
+
+                     L*     0..100  into a 0..ff00 word.
+                     a*     t + 128  range is  -128.0  +127.9961
+                     b*
+
+
+
+Interchange Space   Component     Actual Range        Encoded Range
+CIE XYZ             X             0 -> 1.99997        0x0000 -> 0xffff
+CIE XYZ             Y             0 -> 1.99997        0x0000 -> 0xffff
+CIE XYZ             Z             0 -> 1.99997        0x0000 -> 0xffff
+
+Version 2,3
+-----------
+
+CIELAB (16 bit)     L*            0 -> 100.0          0x0000 -> 0xff00
+CIELAB (16 bit)     a*            -128.0 -> +127.996  0x0000 -> 0x8000 -> 0xffff
+CIELAB (16 bit)     b*            -128.0 -> +127.996  0x0000 -> 0x8000 -> 0xffff
+
+
+Version 4
+---------
+
+CIELAB (16 bit)     L*            0 -> 100.0          0x0000 -> 0xffff
+CIELAB (16 bit)     a*            -128.0 -> +127      0x0000 -> 0x8080 -> 0xffff
+CIELAB (16 bit)     b*            -128.0 -> +127      0x0000 -> 0x8080 -> 0xffff
+
+*/
+
+// Conversions
+void CMSEXPORT cmsXYZ2xyY(cmsContext ContextID, cmsCIExyY* Dest, const cmsCIEXYZ* Source)
+{
+    cmsFloat64Number ISum;
+    cmsUNUSED_PARAMETER(ContextID);
+
+    ISum = 1./(Source -> X + Source -> Y + Source -> Z);
+
+    Dest -> x = (Source -> X) * ISum;
+    Dest -> y = (Source -> Y) * ISum;
+    Dest -> Y = Source -> Y;
+}
+
+void CMSEXPORT cmsxyY2XYZ(cmsContext ContextID, cmsCIEXYZ* Dest, const cmsCIExyY* Source)
+{
+    cmsUNUSED_PARAMETER(ContextID);
+    Dest -> X = (Source -> x / Source -> y) * Source -> Y;
+    Dest -> Y = Source -> Y;
+    Dest -> Z = ((1 - Source -> x - Source -> y) / Source -> y) * Source -> Y;
+}
+
+/*
+       The break point (24/116)^3 = (6/29)^3 is a very small amount of tristimulus
+       primary (0.008856).  Generally, this only happens for
+       nearly ideal blacks and for some orange / amber colors in transmission mode.
+       For example, the Z value of the orange turn indicator lamp lens on an
+       automobile will often be below this value.  But the Z does not
+       contribute to the perceived color directly.
+*/
+
+static
+cmsFloat64Number f(cmsFloat64Number t)
+{
+    const cmsFloat64Number Limit = (24.0/116.0) * (24.0/116.0) * (24.0/116.0);
+
+    if (t <= Limit)
+        return (841.0/108.0) * t + (16.0/116.0);
+    else
+        return pow(t, 1.0/3.0);
+}
+
+static
+cmsFloat64Number f_1(cmsFloat64Number t)
+{
+    const cmsFloat64Number Limit = (24.0/116.0);
+
+    if (t <= Limit) {
+        return (108.0/841.0) * (t - (16.0/116.0));
+    }
+
+    return t * t * t;
+}
+
+
+// Standard XYZ to Lab. it can handle negative XZY numbers in some cases
+void CMSEXPORT cmsXYZ2Lab(cmsContext ContextID, const cmsCIEXYZ* WhitePoint, cmsCIELab* Lab, const cmsCIEXYZ* xyz)
+{
+    cmsFloat64Number fx, fy, fz;
+
+    if (WhitePoint == NULL)
+        WhitePoint = cmsD50_XYZ(ContextID);
+
+    fx = f(xyz->X / WhitePoint->X);
+    fy = f(xyz->Y / WhitePoint->Y);
+    fz = f(xyz->Z / WhitePoint->Z);
+
+    Lab->L = 116.0*fy - 16.0;
+    Lab->a = 500.0*(fx - fy);
+    Lab->b = 200.0*(fy - fz);
+}
+
+
+// Standard XYZ to Lab. It can return negative XYZ in some cases
+void CMSEXPORT cmsLab2XYZ(cmsContext ContextID, const cmsCIEXYZ* WhitePoint, cmsCIEXYZ* xyz,  const cmsCIELab* Lab)
+{
+    cmsFloat64Number x, y, z;
+
+    if (WhitePoint == NULL)
+        WhitePoint = cmsD50_XYZ(ContextID);
+
+    y = (Lab-> L + 16.0) / 116.0;
+    x = y + 0.002 * Lab -> a;
+    z = y - 0.005 * Lab -> b;
+
+    xyz -> X = f_1(x) * WhitePoint -> X;
+    xyz -> Y = f_1(y) * WhitePoint -> Y;
+    xyz -> Z = f_1(z) * WhitePoint -> Z;
+
+}
+
+static
+cmsFloat64Number L2float2(cmsUInt16Number v)
+{
+    return (cmsFloat64Number) v / 652.800;
+}
+
+// the a/b part
+static
+cmsFloat64Number ab2float2(cmsUInt16Number v)
+{
+    return ((cmsFloat64Number) v / 256.0) - 128.0;
+}
+
+static
+cmsUInt16Number L2Fix2(cmsFloat64Number L)
+{
+    return _cmsQuickSaturateWord(L *  652.8);
+}
+
+static
+cmsUInt16Number ab2Fix2(cmsFloat64Number ab)
+{
+    return _cmsQuickSaturateWord((ab + 128.0) * 256.0);
+}
+
+
+static
+cmsFloat64Number L2float4(cmsUInt16Number v)
+{
+    return (cmsFloat64Number) v / 655.35;
+}
+
+// the a/b part
+static
+cmsFloat64Number ab2float4(cmsUInt16Number v)
+{
+    return ((cmsFloat64Number) v / 257.0) - 128.0;
+}
+
+
+void CMSEXPORT cmsLabEncoded2FloatV2(cmsContext ContextID, cmsCIELab* Lab, const cmsUInt16Number wLab[3])
+{
+    cmsUNUSED_PARAMETER(ContextID);
+    Lab->L = L2float2(wLab[0]);
+    Lab->a = ab2float2(wLab[1]);
+    Lab->b = ab2float2(wLab[2]);
+}
+
+
+void CMSEXPORT cmsLabEncoded2Float(cmsContext ContextID, cmsCIELab* Lab, const cmsUInt16Number wLab[3])
+{
+    cmsUNUSED_PARAMETER(ContextID);
+    Lab->L = L2float4(wLab[0]);
+    Lab->a = ab2float4(wLab[1]);
+    Lab->b = ab2float4(wLab[2]);
+}
+
+static
+cmsFloat64Number Clamp_L_doubleV2(cmsFloat64Number L)
+{
+    const cmsFloat64Number L_max = (cmsFloat64Number) (0xFFFF * 100.0) / 0xFF00;
+
+    if (L < 0) L = 0;
+    if (L > L_max) L = L_max;
+
+    return L;
+}
+
+
+static
+cmsFloat64Number Clamp_ab_doubleV2(cmsFloat64Number ab)
+{
+    if (ab < MIN_ENCODEABLE_ab2) ab = MIN_ENCODEABLE_ab2;
+    if (ab > MAX_ENCODEABLE_ab2) ab = MAX_ENCODEABLE_ab2;
+
+    return ab;
+}
+
+void CMSEXPORT cmsFloat2LabEncodedV2(cmsContext ContextID, cmsUInt16Number wLab[3], const cmsCIELab* fLab)
+{
+    cmsCIELab Lab;
+    cmsUNUSED_PARAMETER(ContextID);
+
+    Lab.L = Clamp_L_doubleV2(fLab ->L);
+    Lab.a = Clamp_ab_doubleV2(fLab ->a);
+    Lab.b = Clamp_ab_doubleV2(fLab ->b);
+
+    wLab[0] = L2Fix2(Lab.L);
+    wLab[1] = ab2Fix2(Lab.a);
+    wLab[2] = ab2Fix2(Lab.b);
+}
+
+
+static
+cmsFloat64Number Clamp_L_doubleV4(cmsFloat64Number L)
+{
+    if (L < 0) L = 0;
+    if (L > 100.0) L = 100.0;
+
+    return L;
+}
+
+static
+cmsFloat64Number Clamp_ab_doubleV4(cmsFloat64Number ab)
+{
+    if (ab < MIN_ENCODEABLE_ab4) ab = MIN_ENCODEABLE_ab4;
+    if (ab > MAX_ENCODEABLE_ab4) ab = MAX_ENCODEABLE_ab4;
+
+    return ab;
+}
+
+static
+cmsUInt16Number L2Fix4(cmsFloat64Number L)
+{
+    return _cmsQuickSaturateWord(L *  655.35);
+}
+
+static
+cmsUInt16Number ab2Fix4(cmsFloat64Number ab)
+{
+    return _cmsQuickSaturateWord((ab + 128.0) * 257.0);
+}
+
+void CMSEXPORT cmsFloat2LabEncoded(cmsContext ContextID, cmsUInt16Number wLab[3], const cmsCIELab* fLab)
+{
+    cmsCIELab Lab;
+    cmsUNUSED_PARAMETER(ContextID);
+
+    Lab.L = Clamp_L_doubleV4(fLab ->L);
+    Lab.a = Clamp_ab_doubleV4(fLab ->a);
+    Lab.b = Clamp_ab_doubleV4(fLab ->b);
+
+    wLab[0] = L2Fix4(Lab.L);
+    wLab[1] = ab2Fix4(Lab.a);
+    wLab[2] = ab2Fix4(Lab.b);
+}
+
+// Auxiliary: convert to Radians
+static
+cmsFloat64Number RADIANS(cmsFloat64Number deg)
+{
+    return (deg * M_PI) / 180.;
+}
+
+
+// Auxiliary: atan2 but operating in degrees and returning 0 if a==b==0
+static
+cmsFloat64Number atan2deg(cmsFloat64Number a, cmsFloat64Number b)
+{
+   cmsFloat64Number h;
+
+   if (a == 0 && b == 0)
+            h   = 0;
+    else
+            h = atan2(a, b);
+
+    h *= (180. / M_PI);
+
+    while (h > 360.)
+        h -= 360.;
+
+    while ( h < 0)
+        h += 360.;
+
+    return h;
+}
+
+
+// Auxiliary: Square
+static
+cmsFloat64Number Sqr(cmsFloat64Number v)
+{
+    return v *  v;
+}
+// From cylindrical coordinates. No check is performed, then negative values are allowed
+void CMSEXPORT cmsLab2LCh(cmsContext ContextID, cmsCIELCh* LCh, const cmsCIELab* Lab)
+{
+    cmsUNUSED_PARAMETER(ContextID);
+    LCh -> L = Lab -> L;
+    LCh -> C = pow(Sqr(Lab ->a) + Sqr(Lab ->b), 0.5);
+    LCh -> h = atan2deg(Lab ->b, Lab ->a);
+}
+
+
+// To cylindrical coordinates. No check is performed, then negative values are allowed
+void CMSEXPORT cmsLCh2Lab(cmsContext ContextID, cmsCIELab* Lab, const cmsCIELCh* LCh)
+{
+    cmsFloat64Number h = (LCh -> h * M_PI) / 180.0;
+    cmsUNUSED_PARAMETER(ContextID);
+
+    Lab -> L = LCh -> L;
+    Lab -> a = LCh -> C * cos(h);
+    Lab -> b = LCh -> C * sin(h);
+}
+
+// In XYZ All 3 components are encoded using 1.15 fixed point
+static
+cmsUInt16Number XYZ2Fix(cmsFloat64Number d)
+{
+    return _cmsQuickSaturateWord(d * 32768.0);
+}
+
+void CMSEXPORT cmsFloat2XYZEncoded(cmsContext ContextID, cmsUInt16Number XYZ[3], const cmsCIEXYZ* fXYZ)
+{
+    cmsCIEXYZ xyz;
+    cmsUNUSED_PARAMETER(ContextID);
+
+    xyz.X = fXYZ -> X;
+    xyz.Y = fXYZ -> Y;
+    xyz.Z = fXYZ -> Z;
+
+    // Clamp to encodeable values.
+    if (xyz.Y <= 0) {
+
+        xyz.X = 0;
+        xyz.Y = 0;
+        xyz.Z = 0;
+    }
+
+    if (xyz.X > MAX_ENCODEABLE_XYZ)
+        xyz.X = MAX_ENCODEABLE_XYZ;
+
+    if (xyz.X < 0)
+        xyz.X = 0;
+
+    if (xyz.Y > MAX_ENCODEABLE_XYZ)
+        xyz.Y = MAX_ENCODEABLE_XYZ;
+
+    if (xyz.Y < 0)
+        xyz.Y = 0;
+
+    if (xyz.Z > MAX_ENCODEABLE_XYZ)
+        xyz.Z = MAX_ENCODEABLE_XYZ;
+
+    if (xyz.Z < 0)
+        xyz.Z = 0;
+
+
+    XYZ[0] = XYZ2Fix(xyz.X);
+    XYZ[1] = XYZ2Fix(xyz.Y);
+    XYZ[2] = XYZ2Fix(xyz.Z);
+}
+
+
+//  To convert from Fixed 1.15 point to cmsFloat64Number
+static
+cmsFloat64Number XYZ2float(cmsContext ContextID, cmsUInt16Number v)
+{
+    cmsS15Fixed16Number fix32;
+
+    // From 1.15 to 15.16
+    fix32 = v << 1;
+
+    // From fixed 15.16 to cmsFloat64Number
+    return _cms15Fixed16toDouble(ContextID, fix32);
+}
+
+
+void CMSEXPORT cmsXYZEncoded2Float(cmsContext ContextID, cmsCIEXYZ* fXYZ, const cmsUInt16Number XYZ[3])
+{
+    fXYZ -> X = XYZ2float(ContextID, XYZ[0]);
+    fXYZ -> Y = XYZ2float(ContextID, XYZ[1]);
+    fXYZ -> Z = XYZ2float(ContextID, XYZ[2]);
+}
+
+
+// Returns dE on two Lab values
+cmsFloat64Number CMSEXPORT cmsDeltaE(cmsContext ContextID, const cmsCIELab* Lab1, const cmsCIELab* Lab2)
+{
+    cmsFloat64Number dL, da, db;
+    cmsUNUSED_PARAMETER(ContextID);
+
+    dL = fabs(Lab1 -> L - Lab2 -> L);
+    da = fabs(Lab1 -> a - Lab2 -> a);
+    db = fabs(Lab1 -> b - Lab2 -> b);
+
+    return pow(Sqr(dL) + Sqr(da) + Sqr(db), 0.5);
+}
+
+
+// Return the CIE94 Delta E
+cmsFloat64Number CMSEXPORT cmsCIE94DeltaE(cmsContext ContextID, const cmsCIELab* Lab1, const cmsCIELab* Lab2)
+{
+    cmsCIELCh LCh1, LCh2;
+    cmsFloat64Number dE, dL, dC, dh, dhsq;
+    cmsFloat64Number c12, sc, sh;
+
+    dL = fabs(Lab1 ->L - Lab2 ->L);
+
+    cmsLab2LCh(ContextID, &LCh1, Lab1);
+    cmsLab2LCh(ContextID, &LCh2, Lab2);
+
+    dC  = fabs(LCh1.C - LCh2.C);
+    dE  = cmsDeltaE(ContextID, Lab1, Lab2);
+
+    dhsq = Sqr(dE) - Sqr(dL) - Sqr(dC);
+    if (dhsq < 0)
+        dh = 0;
+    else
+        dh = pow(dhsq, 0.5);
+
+    c12 = sqrt(LCh1.C * LCh2.C);
+
+    sc = 1.0 + (0.048 * c12);
+    sh = 1.0 + (0.014 * c12);
+
+    return sqrt(Sqr(dL)  + Sqr(dC) / Sqr(sc) + Sqr(dh) / Sqr(sh));
+}
+
+
+// Auxiliary
+static
+cmsFloat64Number ComputeLBFD(const cmsCIELab* Lab)
+{
+  cmsFloat64Number yt;
+
+  if (Lab->L > 7.996969)
+        yt = (Sqr((Lab->L+16)/116)*((Lab->L+16)/116))*100;
+  else
+        yt = 100 * (Lab->L / 903.3);
+
+  return (54.6 * (M_LOG10E * (log(yt + 1.5))) - 9.6);
+}
+
+
+
+// bfd - gets BFD(1:1) difference between Lab1, Lab2
+cmsFloat64Number CMSEXPORT cmsBFDdeltaE(cmsContext ContextID, const cmsCIELab* Lab1, const cmsCIELab* Lab2)
+{
+    cmsFloat64Number lbfd1,lbfd2,AveC,Aveh,dE,deltaL,
+        deltaC,deltah,dc,t,g,dh,rh,rc,rt,bfd;
+    cmsCIELCh LCh1, LCh2;
+
+
+    lbfd1 = ComputeLBFD(Lab1);
+    lbfd2 = ComputeLBFD(Lab2);
+    deltaL = lbfd2 - lbfd1;
+
+    cmsLab2LCh(ContextID, &LCh1, Lab1);
+    cmsLab2LCh(ContextID, &LCh2, Lab2);
+
+    deltaC = LCh2.C - LCh1.C;
+    AveC = (LCh1.C+LCh2.C)/2;
+    Aveh = (LCh1.h+LCh2.h)/2;
+
+    dE = cmsDeltaE(ContextID, Lab1, Lab2);
+
+    if (Sqr(dE)>(Sqr(Lab2->L-Lab1->L)+Sqr(deltaC)))
+        deltah = sqrt(Sqr(dE)-Sqr(Lab2->L-Lab1->L)-Sqr(deltaC));
+    else
+        deltah =0;
+
+
+    dc   = 0.035 * AveC / (1 + 0.00365 * AveC)+0.521;
+    g    = sqrt(Sqr(Sqr(AveC))/(Sqr(Sqr(AveC))+14000));
+    t    = 0.627+(0.055*cos((Aveh-254)/(180/M_PI))-
+           0.040*cos((2*Aveh-136)/(180/M_PI))+
+           0.070*cos((3*Aveh-31)/(180/M_PI))+
+           0.049*cos((4*Aveh+114)/(180/M_PI))-
+           0.015*cos((5*Aveh-103)/(180/M_PI)));
+
+    dh    = dc*(g*t+1-g);
+    rh    = -0.260*cos((Aveh-308)/(180/M_PI))-
+           0.379*cos((2*Aveh-160)/(180/M_PI))-
+           0.636*cos((3*Aveh+254)/(180/M_PI))+
+           0.226*cos((4*Aveh+140)/(180/M_PI))-
+           0.194*cos((5*Aveh+280)/(180/M_PI));
+
+    rc = sqrt((AveC*AveC*AveC*AveC*AveC*AveC)/((AveC*AveC*AveC*AveC*AveC*AveC)+70000000));
+    rt = rh*rc;
+
+    bfd = sqrt(Sqr(deltaL)+Sqr(deltaC/dc)+Sqr(deltah/dh)+(rt*(deltaC/dc)*(deltah/dh)));
+
+    return bfd;
+}
+
+
+//  cmc - CMC(l:c) difference between Lab1, Lab2
+cmsFloat64Number CMSEXPORT cmsCMCdeltaE(cmsContext ContextID, const cmsCIELab* Lab1, const cmsCIELab* Lab2, cmsFloat64Number l, cmsFloat64Number c)
+{
+  cmsFloat64Number dE,dL,dC,dh,sl,sc,sh,t,f,cmc;
+  cmsCIELCh LCh1, LCh2;
+
+  if (Lab1 ->L == 0 && Lab2 ->L == 0) return 0;
+
+  cmsLab2LCh(ContextID, &LCh1, Lab1);
+  cmsLab2LCh(ContextID, &LCh2, Lab2);
+
+
+  dL = Lab2->L-Lab1->L;
+  dC = LCh2.C-LCh1.C;
+
+  dE = cmsDeltaE(ContextID, Lab1, Lab2);
+
+  if (Sqr(dE)>(Sqr(dL)+Sqr(dC)))
+            dh = sqrt(Sqr(dE)-Sqr(dL)-Sqr(dC));
+  else
+            dh =0;
+
+  if ((LCh1.h > 164) && (LCh1.h < 345))
+      t = 0.56 + fabs(0.2 * cos(((LCh1.h + 168)/(180/M_PI))));
+  else
+      t = 0.36 + fabs(0.4 * cos(((LCh1.h + 35 )/(180/M_PI))));
+
+   sc  = 0.0638   * LCh1.C / (1 + 0.0131  * LCh1.C) + 0.638;
+   sl  = 0.040975 * Lab1->L /(1 + 0.01765 * Lab1->L);
+
+   if (Lab1->L<16)
+         sl = 0.511;
+
+   f   = sqrt((LCh1.C * LCh1.C * LCh1.C * LCh1.C)/((LCh1.C * LCh1.C * LCh1.C * LCh1.C)+1900));
+   sh  = sc*(t*f+1-f);
+   cmc = sqrt(Sqr(dL/(l*sl))+Sqr(dC/(c*sc))+Sqr(dh/sh));
+
+   return cmc;
+}
+
+// dE2000 The weightings KL, KC and KH can be modified to reflect the relative
+// importance of lightness, chroma and hue in different industrial applications
+cmsFloat64Number CMSEXPORT cmsCIE2000DeltaE(cmsContext ContextID, const cmsCIELab* Lab1, const cmsCIELab* Lab2,
+                                  cmsFloat64Number Kl, cmsFloat64Number Kc, cmsFloat64Number Kh)
+{
+    cmsFloat64Number L1  = Lab1->L;
+    cmsFloat64Number a1  = Lab1->a;
+    cmsFloat64Number b1  = Lab1->b;
+    cmsFloat64Number C   = sqrt( Sqr(a1) + Sqr(b1) );
+
+    cmsFloat64Number Ls = Lab2 ->L;
+    cmsFloat64Number as = Lab2 ->a;
+    cmsFloat64Number bs = Lab2 ->b;
+    cmsFloat64Number Cs = sqrt( Sqr(as) + Sqr(bs) );
+
+    cmsFloat64Number G = 0.5 * ( 1 - sqrt(pow((C + Cs) / 2 , 7.0) / (pow((C + Cs) / 2, 7.0) + pow(25.0, 7.0) ) ));
+
+    cmsFloat64Number a_p = (1 + G ) * a1;
+    cmsFloat64Number b_p = b1;
+    cmsFloat64Number C_p = sqrt( Sqr(a_p) + Sqr(b_p));
+    cmsFloat64Number h_p = atan2deg(b_p, a_p);
+
+
+    cmsFloat64Number a_ps = (1 + G) * as;
+    cmsFloat64Number b_ps = bs;
+    cmsFloat64Number C_ps = sqrt(Sqr(a_ps) + Sqr(b_ps));
+    cmsFloat64Number h_ps = atan2deg(b_ps, a_ps);
+
+    cmsFloat64Number meanC_p =(C_p + C_ps) / 2;
+
+    cmsFloat64Number hps_plus_hp  = h_ps + h_p;
+    cmsFloat64Number hps_minus_hp = h_ps - h_p;
+
+    cmsFloat64Number meanh_p = fabs(hps_minus_hp) <= 180.000001 ? (hps_plus_hp)/2 :
+                            (hps_plus_hp) < 360 ? (hps_plus_hp + 360)/2 :
+                                                 (hps_plus_hp - 360)/2;
+
+    cmsFloat64Number delta_h = (hps_minus_hp) <= -180.000001 ?  (hps_minus_hp + 360) :
+                            (hps_minus_hp) > 180 ? (hps_minus_hp - 360) :
+                                                    (hps_minus_hp);
+    cmsFloat64Number delta_L = (Ls - L1);
+    cmsFloat64Number delta_C = (C_ps - C_p );
+
+
+    cmsFloat64Number delta_H =2 * sqrt(C_ps*C_p) * sin(RADIANS(delta_h) / 2);
+
+    cmsFloat64Number T = 1 - 0.17 * cos(RADIANS(meanh_p-30))
+                 + 0.24 * cos(RADIANS(2*meanh_p))
+                 + 0.32 * cos(RADIANS(3*meanh_p + 6))
+                 - 0.2  * cos(RADIANS(4*meanh_p - 63));
+
+    cmsFloat64Number Sl = 1 + (0.015 * Sqr((Ls + L1) /2- 50) )/ sqrt(20 + Sqr( (Ls+L1)/2 - 50) );
+
+    cmsFloat64Number Sc = 1 + 0.045 * (C_p + C_ps)/2;
+    cmsFloat64Number Sh = 1 + 0.015 * ((C_ps + C_p)/2) * T;
+
+    cmsFloat64Number delta_ro = 30 * exp( -Sqr(((meanh_p - 275 ) / 25)));
+
+    cmsFloat64Number Rc = 2 * sqrt(( pow(meanC_p, 7.0) )/( pow(meanC_p, 7.0) + pow(25.0, 7.0)));
+
+    cmsFloat64Number Rt = -sin(2 * RADIANS(delta_ro)) * Rc;
+
+    cmsFloat64Number deltaE00 = sqrt( Sqr(delta_L /(Sl * Kl)) +
+                            Sqr(delta_C/(Sc * Kc))  +
+                            Sqr(delta_H/(Sh * Kh))  +
+                            Rt*(delta_C/(Sc * Kc)) * (delta_H / (Sh * Kh)));
+
+    cmsUNUSED_PARAMETER(ContextID);
+
+    return deltaE00;
+}
+
+// This function returns a number of gridpoints to be used as LUT table. It assumes same number
+// of gripdpoints in all dimensions. Flags may override the choice.
+cmsUInt32Number CMSEXPORT _cmsReasonableGridpointsByColorspace(cmsContext ContextID, cmsColorSpaceSignature Colorspace, cmsUInt32Number dwFlags)
+{
+    cmsUInt32Number nChannels;
+
+    // Already specified?
+    if (dwFlags & 0x00FF0000) {
+            // Yes, grab'em
+            return (dwFlags >> 16) & 0xFF;
+    }
+
+    nChannels = cmsChannelsOf(ContextID, Colorspace);
+
+    // HighResPrecalc is maximum resolution
+    if (dwFlags & cmsFLAGS_HIGHRESPRECALC) {
+
+        if (nChannels > 4)
+                return 7;       // 7 for Hifi
+
+        if (nChannels == 4)     // 23 for CMYK
+                return 23;
+
+        return 49;      // 49 for RGB and others
+    }
+
+
+    // LowResPrecal is lower resolution
+    if (dwFlags & cmsFLAGS_LOWRESPRECALC) {
+
+        if (nChannels > 4)
+                return 6;       // 6 for more than 4 channels
+
+        if (nChannels == 1)
+                return 33;      // For monochrome
+
+        return 17;              // 17 for remaining
+    }
+
+    // Default values
+    if (nChannels > 4)
+                return 7;       // 7 for Hifi
+
+    if (nChannels == 4)
+                return 17;      // 17 for CMYK
+
+    return 33;                  // 33 for RGB
+}
+
+
+cmsBool  _cmsEndPointsBySpace(cmsColorSpaceSignature Space,
+                             cmsUInt16Number **White,
+                             cmsUInt16Number **Black,
+                             cmsUInt32Number *nOutputs)
+{
+       // Only most common spaces
+
+       static cmsUInt16Number RGBblack[4]  = { 0, 0, 0 };
+       static cmsUInt16Number RGBwhite[4]  = { 0xffff, 0xffff, 0xffff };
+       static cmsUInt16Number CMYKblack[4] = { 0xffff, 0xffff, 0xffff, 0xffff };   // 400% of ink
+       static cmsUInt16Number CMYKwhite[4] = { 0, 0, 0, 0 };
+       static cmsUInt16Number LABblack[4]  = { 0, 0x8080, 0x8080 };               // V4 Lab encoding
+       static cmsUInt16Number LABwhite[4]  = { 0xFFFF, 0x8080, 0x8080 };
+       static cmsUInt16Number CMYblack[4]  = { 0xffff, 0xffff, 0xffff };
+       static cmsUInt16Number CMYwhite[4]  = { 0, 0, 0 };
+       static cmsUInt16Number Grayblack[4] = { 0 };
+       static cmsUInt16Number GrayWhite[4] = { 0xffff };
+
+       switch (Space) {
+
+       case cmsSigGrayData: if (White)    *White = GrayWhite;
+                           if (Black)    *Black = Grayblack;
+                           if (nOutputs) *nOutputs = 1;
+                           return TRUE;
+
+       case cmsSigRgbData:  if (White)    *White = RGBwhite;
+                           if (Black)    *Black = RGBblack;
+                           if (nOutputs) *nOutputs = 3;
+                           return TRUE;
+
+       case cmsSigLabData:  if (White)    *White = LABwhite;
+                           if (Black)    *Black = LABblack;
+                           if (nOutputs) *nOutputs = 3;
+                           return TRUE;
+
+       case cmsSigCmykData: if (White)    *White = CMYKwhite;
+                           if (Black)    *Black = CMYKblack;
+                           if (nOutputs) *nOutputs = 4;
+                           return TRUE;
+
+       case cmsSigCmyData:  if (White)    *White = CMYwhite;
+                           if (Black)    *Black = CMYblack;
+                           if (nOutputs) *nOutputs = 3;
+                           return TRUE;
+
+       default:;
+       }
+
+  return FALSE;
+}
+
+
+
+// Several utilities -------------------------------------------------------
+
+// Translate from our colorspace to ICC representation
+
+cmsColorSpaceSignature CMSEXPORT _cmsICCcolorSpace(cmsContext ContextID, int OurNotation)
+{
+    switch (OurNotation) {
+
+       case 1:
+       case PT_GRAY: return cmsSigGrayData;
+
+       case 2:
+       case PT_RGB:  return cmsSigRgbData;
+
+       case PT_CMY:  return cmsSigCmyData;
+       case PT_CMYK: return cmsSigCmykData;
+       case PT_YCbCr:return cmsSigYCbCrData;
+       case PT_YUV:  return cmsSigLuvData;
+       case PT_XYZ:  return cmsSigXYZData;
+
+       case PT_LabV2:
+       case PT_Lab:  return cmsSigLabData;
+
+       case PT_YUVK: return cmsSigLuvKData;
+       case PT_HSV:  return cmsSigHsvData;
+       case PT_HLS:  return cmsSigHlsData;
+       case PT_Yxy:  return cmsSigYxyData;
+
+       case PT_MCH1: return cmsSigMCH1Data;
+       case PT_MCH2: return cmsSigMCH2Data;
+       case PT_MCH3: return cmsSigMCH3Data;
+       case PT_MCH4: return cmsSigMCH4Data;
+       case PT_MCH5: return cmsSigMCH5Data;
+       case PT_MCH6: return cmsSigMCH6Data;
+       case PT_MCH7: return cmsSigMCH7Data;
+       case PT_MCH8: return cmsSigMCH8Data;
+
+       case PT_MCH9:  return cmsSigMCH9Data;
+       case PT_MCH10: return cmsSigMCHAData;
+       case PT_MCH11: return cmsSigMCHBData;
+       case PT_MCH12: return cmsSigMCHCData;
+       case PT_MCH13: return cmsSigMCHDData;
+       case PT_MCH14: return cmsSigMCHEData;
+       case PT_MCH15: return cmsSigMCHFData;
+
+       default:  return (cmsColorSpaceSignature) 0;
+       }
+    cmsUNUSED_PARAMETER(ContextID);
+}
+
+
+int CMSEXPORT _cmsLCMScolorSpace(cmsContext ContextID, cmsColorSpaceSignature ProfileSpace)
+{
+    cmsUNUSED_PARAMETER(ContextID);
+    switch (ProfileSpace) {
+
+    case cmsSigGrayData: return  PT_GRAY;
+    case cmsSigRgbData:  return  PT_RGB;
+    case cmsSigCmyData:  return  PT_CMY;
+    case cmsSigCmykData: return  PT_CMYK;
+    case cmsSigYCbCrData:return  PT_YCbCr;
+    case cmsSigLuvData:  return  PT_YUV;
+    case cmsSigXYZData:  return  PT_XYZ;
+    case cmsSigLabData:  return  PT_Lab;
+    case cmsSigLuvKData: return  PT_YUVK;
+    case cmsSigHsvData:  return  PT_HSV;
+    case cmsSigHlsData:  return  PT_HLS;
+    case cmsSigYxyData:  return  PT_Yxy;
+
+    case cmsSig1colorData:
+    case cmsSigMCH1Data: return PT_MCH1;
+
+    case cmsSig2colorData:
+    case cmsSigMCH2Data: return PT_MCH2;
+
+    case cmsSig3colorData:
+    case cmsSigMCH3Data: return PT_MCH3;
+
+    case cmsSig4colorData:
+    case cmsSigMCH4Data: return PT_MCH4;
+
+    case cmsSig5colorData:
+    case cmsSigMCH5Data: return PT_MCH5;
+
+    case cmsSig6colorData:
+    case cmsSigMCH6Data: return PT_MCH6;
+
+    case cmsSigMCH7Data:
+    case cmsSig7colorData:return PT_MCH7;
+
+    case cmsSigMCH8Data:
+    case cmsSig8colorData:return PT_MCH8;
+
+    case cmsSigMCH9Data:
+    case cmsSig9colorData:return PT_MCH9;
+
+    case cmsSigMCHAData:
+    case cmsSig10colorData:return PT_MCH10;
+
+    case cmsSigMCHBData:
+    case cmsSig11colorData:return PT_MCH11;
+
+    case cmsSigMCHCData:
+    case cmsSig12colorData:return PT_MCH12;
+
+    case cmsSigMCHDData:
+    case cmsSig13colorData:return PT_MCH13;
+
+    case cmsSigMCHEData:
+    case cmsSig14colorData:return PT_MCH14;
+
+    case cmsSigMCHFData:
+    case cmsSig15colorData:return PT_MCH15;
+
+    default:  return (cmsColorSpaceSignature) 0;
+    }
+}
+
+
+cmsInt32Number CMSEXPORT cmsChannelsOfColorSpace(cmsContext ContextID, cmsColorSpaceSignature ColorSpace)
+{
+    cmsUNUSED_PARAMETER(ContextID);
+    switch (ColorSpace) {
+
+    case cmsSigMCH1Data:
+    case cmsSig1colorData:
+    case cmsSigGrayData: return 1;
+
+    case cmsSigMCH2Data:
+    case cmsSig2colorData:  return 2;
+
+    case cmsSigXYZData:
+    case cmsSigLabData:
+    case cmsSigLuvData:
+    case cmsSigYCbCrData:
+    case cmsSigYxyData:
+    case cmsSigRgbData:
+    case cmsSigHsvData:
+    case cmsSigHlsData:
+    case cmsSigCmyData:
+    case cmsSigMCH3Data:
+    case cmsSig3colorData:  return 3;
+
+    case cmsSigLuvKData:
+    case cmsSigCmykData:
+    case cmsSigMCH4Data:
+    case cmsSig4colorData:  return 4;
+
+    case cmsSigMCH5Data:
+    case cmsSig5colorData:  return 5;
+
+    case cmsSigMCH6Data:
+    case cmsSig6colorData:  return 6;
+
+    case cmsSigMCH7Data:
+    case cmsSig7colorData:  return  7;
+
+    case cmsSigMCH8Data:
+    case cmsSig8colorData:  return  8;
+
+    case cmsSigMCH9Data:
+    case cmsSig9colorData:  return  9;
+
+    case cmsSigMCHAData:
+    case cmsSig10colorData: return 10;
+
+    case cmsSigMCHBData:
+    case cmsSig11colorData: return 11;
+
+    case cmsSigMCHCData:
+    case cmsSig12colorData: return 12;
+
+    case cmsSigMCHDData:
+    case cmsSig13colorData: return 13;
+
+    case cmsSigMCHEData:
+    case cmsSig14colorData: return 14;
+
+    case cmsSigMCHFData:
+    case cmsSig15colorData: return 15;
+
+    default: return -1;
+    }
+}
+
+/**
+* DEPRECATED: Provided for compatibility only
+*/
+cmsUInt32Number CMSEXPORT cmsChannelsOf(cmsContext ContextID, cmsColorSpaceSignature ColorSpace)
+{
+    int n = cmsChannelsOfColorSpace(ContextID, ColorSpace);
+    if (n < 0) return 3;
+    return (cmsUInt32Number)n;
+}