forked from openkylin/imagemagick
178 lines
4.5 KiB
C
178 lines
4.5 KiB
C
/*
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Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization
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dedicated to making software imaging solutions freely available.
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You may not use this file except in compliance with the License. You may
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obtain a copy of the License at
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https://imagemagick.org/script/license.php
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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MagickCore private graphic gems methods.
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*/
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#ifndef MAGICKCORE_GEM_PRIVATE_H
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#define MAGICKCORE_GEM_PRIVATE_H
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#include "magick/pixel-accessor.h"
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#include "magick/visual-effects.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#define D65X 0.950456
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#define D65Y 1.0
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#define D65Z 1.088754
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#define CIEEpsilon (216.0/24389.0)
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#define CIEK (24389.0/27.0)
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static inline void ConvertLabToXYZ(const double L,const double a,const double b,
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double *X,double *Y,double *Z)
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{
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double
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x,
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y,
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z;
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assert(X != (double *) NULL);
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assert(Y != (double *) NULL);
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assert(Z != (double *) NULL);
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y=(L+16.0)/116.0;
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x=y+a/500.0;
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z=y-b/200.0;
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if ((x*x*x) > CIEEpsilon)
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x=(x*x*x);
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else
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x=(116.0*x-16.0)/CIEK;
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if (L > (CIEK*CIEEpsilon))
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y=(y*y*y);
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else
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y=L/CIEK;
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if ((z*z*z) > CIEEpsilon)
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z=(z*z*z);
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else
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z=(116.0*z-16.0)/CIEK;
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*X=D65X*x;
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*Y=D65Y*y;
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*Z=D65Z*z;
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}
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static inline void ConvertXYZToLuv(const double X,const double Y,const double Z,
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double *L,double *u,double *v)
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{
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double
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alpha;
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assert(L != (double *) NULL);
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assert(u != (double *) NULL);
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assert(v != (double *) NULL);
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if ((Y/D65Y) > CIEEpsilon)
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*L=(double) (116.0*pow(Y/D65Y,1.0/3.0)-16.0);
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else
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*L=CIEK*(Y/D65Y);
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alpha=PerceptibleReciprocal(X+15.0*Y+3.0*Z);
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*u=13.0*(*L)*((4.0*alpha*X)-(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z)));
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*v=13.0*(*L)*((9.0*alpha*Y)-(9.0*D65Y/(D65X+15.0*D65Y+3.0*D65Z)));
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*L/=100.0;
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*u=(*u+134.0)/354.0;
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*v=(*v+140.0)/262.0;
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}
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static inline void ConvertRGBToXYZ(const Quantum red,const Quantum green,
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const Quantum blue,double *X,double *Y,double *Z)
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{
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double
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b,
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g,
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r;
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assert(X != (double *) NULL);
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assert(Y != (double *) NULL);
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assert(Z != (double *) NULL);
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r=QuantumScale*DecodePixelGamma((MagickRealType) red);
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g=QuantumScale*DecodePixelGamma((MagickRealType) green);
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b=QuantumScale*DecodePixelGamma((MagickRealType) blue);
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*X=0.4124564*r+0.3575761*g+0.1804375*b;
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*Y=0.2126729*r+0.7151522*g+0.0721750*b;
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*Z=0.0193339*r+0.1191920*g+0.9503041*b;
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}
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static inline void ConvertXYZToLab(const double X,const double Y,const double Z,
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double *L,double *a,double *b)
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{
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double
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x,
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y,
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z;
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assert(L != (double *) NULL);
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assert(a != (double *) NULL);
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assert(b != (double *) NULL);
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if ((X/D65X) > CIEEpsilon)
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x=pow(X/D65X,1.0/3.0);
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else
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x=(CIEK*X/D65X+16.0)/116.0;
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if ((Y/D65Y) > CIEEpsilon)
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y=pow(Y/D65Y,1.0/3.0);
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else
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y=(CIEK*Y/D65Y+16.0)/116.0;
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if ((Z/D65Z) > CIEEpsilon)
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z=pow(Z/D65Z,1.0/3.0);
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else
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z=(CIEK*Z/D65Z+16.0)/116.0;
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*L=((116.0*y)-16.0)/100.0;
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*a=(500.0*(x-y))/255.0+0.5;
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*b=(200.0*(y-z))/255.0+0.5;
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}
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static inline void ConvertLuvToXYZ(const double L,const double u,const double v,
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double *X,double *Y,double *Z)
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{
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double
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gamma;
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assert(X != (double *) NULL);
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assert(Y != (double *) NULL);
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assert(Z != (double *) NULL);
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if (L > (CIEK*CIEEpsilon))
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*Y=(double) pow((L+16.0)/116.0,3.0);
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else
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*Y=L/CIEK;
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gamma=PerceptibleReciprocal((((52.0*L/(u+13.0*L*(4.0*D65X/(D65X+15.0*D65Y+
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3.0*D65Z))))-1.0)/3.0)-(-1.0/3.0));
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*X=gamma*((*Y*((39.0*L/(v+13.0*L*(9.0*D65Y/(D65X+15.0*D65Y+3.0*D65Z))))-5.0))+
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5.0*(*Y));
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*Z=(*X*(((52.0f*L/(u+13.0*L*(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z))))-1.0)/3.0))-
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5.0*(*Y);
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}
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static inline void ConvertXYZToRGB(const double X,const double Y,const double Z,
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Quantum *red,Quantum *green,Quantum *blue)
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{
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double
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b,
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g,
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r;
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assert(red != (Quantum *) NULL);
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assert(green != (Quantum *) NULL);
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assert(blue != (Quantum *) NULL);
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r=3.2404542*X-1.5371385*Y-0.4985314*Z;
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g=(-0.9692660)*X+1.8760108*Y+0.0415560*Z;
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b=0.0556434*X-0.2040259*Y+1.0572252*Z;
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*red=ClampToQuantum((MagickRealType) EncodePixelGamma(QuantumRange*r));
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*green=ClampToQuantum((MagickRealType) EncodePixelGamma(QuantumRange*g));
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*blue=ClampToQuantum((MagickRealType) EncodePixelGamma(QuantumRange*b));
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif
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