MagickCore  6.9.10
Convert, Edit, Or Compose Bitmap Images
gem-private.h
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1 /*
2  Copyright 1999-2020 ImageMagick Studio LLC, a non-profit organization
3  dedicated to making software imaging solutions freely available.
4 
5  You may not use this file except in compliance with the License. You may
6  obtain a copy of the License at
7 
8  https://imagemagick.org/script/license.php
9 
10  Unless required by applicable law or agreed to in writing, software
11  distributed under the License is distributed on an "AS IS" BASIS,
12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  See the License for the specific language governing permissions and
14  limitations under the License.
15 
16  MagickCore private graphic gems methods.
17 */
18 #ifndef MAGICKCORE_GEM_PRIVATE_H
19 #define MAGICKCORE_GEM_PRIVATE_H
20 
21 #include "magick/pixel-accessor.h"
22 
23 #if defined(__cplusplus) || defined(c_plusplus)
24 extern "C" {
25 #endif
26 
27 #define D65X 0.950456
28 #define D65Y 1.0
29 #define D65Z 1.088754
30 #define CIEEpsilon (216.0/24389.0)
31 #define CIEK (24389.0/27.0)
32 
33 static inline void ConvertLabToXYZ(const double L,const double a,const double b,
34  double *X,double *Y,double *Z)
35 {
36  double
37  x,
38  y,
39  z;
40 
41  assert(X != (double *) NULL);
42  assert(Y != (double *) NULL);
43  assert(Z != (double *) NULL);
44  y=(L+16.0)/116.0;
45  x=y+a/500.0;
46  z=y-b/200.0;
47  if ((x*x*x) > CIEEpsilon)
48  x=(x*x*x);
49  else
50  x=(116.0*x-16.0)/CIEK;
51  if ((y*y*y) > CIEEpsilon)
52  y=(y*y*y);
53  else
54  y=L/CIEK;
55  if ((z*z*z) > CIEEpsilon)
56  z=(z*z*z);
57  else
58  z=(116.0*z-16.0)/CIEK;
59  *X=D65X*x;
60  *Y=D65Y*y;
61  *Z=D65Z*z;
62 }
63 
64 static inline void ConvertXYZToLuv(const double X,const double Y,const double Z,
65  double *L,double *u,double *v)
66 {
67  double
68  alpha;
69 
70  assert(L != (double *) NULL);
71  assert(u != (double *) NULL);
72  assert(v != (double *) NULL);
73  if ((Y/D65Y) > CIEEpsilon)
74  *L=(double) (116.0*pow(Y/D65Y,1.0/3.0)-16.0);
75  else
76  *L=CIEK*(Y/D65Y);
77  alpha=PerceptibleReciprocal(X+15.0*Y+3.0*Z);
78  *u=13.0*(*L)*((4.0*alpha*X)-(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z)));
79  *v=13.0*(*L)*((9.0*alpha*Y)-(9.0*D65Y/(D65X+15.0*D65Y+3.0*D65Z)));
80  *L/=100.0;
81  *u=(*u+134.0)/354.0;
82  *v=(*v+140.0)/262.0;
83 }
84 
85 static inline void ConvertRGBToXYZ(const Quantum red,const Quantum green,
86  const Quantum blue,double *X,double *Y,double *Z)
87 {
88  double
89  b,
90  g,
91  r;
92 
93  assert(X != (double *) NULL);
94  assert(Y != (double *) NULL);
95  assert(Z != (double *) NULL);
99  *X=0.4124564*r+0.3575761*g+0.1804375*b;
100  *Y=0.2126729*r+0.7151522*g+0.0721750*b;
101  *Z=0.0193339*r+0.1191920*g+0.9503041*b;
102 }
103 
104 static inline void ConvertXYZToLab(const double X,const double Y,const double Z,
105  double *L,double *a,double *b)
106 {
107  double
108  x,
109  y,
110  z;
111 
112  assert(L != (double *) NULL);
113  assert(a != (double *) NULL);
114  assert(b != (double *) NULL);
115  if ((X/D65X) > CIEEpsilon)
116  x=pow(X/D65X,1.0/3.0);
117  else
118  x=(CIEK*X/D65X+16.0)/116.0;
119  if ((Y/D65Y) > CIEEpsilon)
120  y=pow(Y/D65Y,1.0/3.0);
121  else
122  y=(CIEK*Y/D65Y+16.0)/116.0;
123  if ((Z/D65Z) > CIEEpsilon)
124  z=pow(Z/D65Z,1.0/3.0);
125  else
126  z=(CIEK*Z/D65Z+16.0)/116.0;
127  *L=((116.0*y)-16.0)/100.0;
128  *a=(500.0*(x-y))/255.0+0.5;
129  *b=(200.0*(y-z))/255.0+0.5;
130 }
131 
132 static inline void ConvertLuvToXYZ(const double L,const double u,const double v,
133  double *X,double *Y,double *Z)
134 {
135  double
136  gamma;
137 
138  assert(X != (double *) NULL);
139  assert(Y != (double *) NULL);
140  assert(Z != (double *) NULL);
141  if (L > (CIEK*CIEEpsilon))
142  *Y=(double) pow((L+16.0)/116.0,3.0);
143  else
144  *Y=L/CIEK;
145  gamma=PerceptibleReciprocal((((52.0*L/(u+13.0*L*(4.0*D65X/(D65X+15.0*D65Y+
146  3.0*D65Z))))-1.0)/3.0)-(-1.0/3.0));
147  *X=gamma*((*Y*((39.0*L/(v+13.0*L*(9.0*D65Y/(D65X+15.0*D65Y+3.0*D65Z))))-5.0))+
148  5.0*(*Y));
149  *Z=(*X*(((52.0f*L/(u+13.0*L*(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z))))-1.0)/3.0))-
150  5.0*(*Y);
151 }
152 
153 static inline void ConvertXYZToRGB(const double X,const double Y,const double Z,
154  Quantum *red,Quantum *green,Quantum *blue)
155 {
156  double
157  b,
158  g,
159  r;
160 
161  assert(red != (Quantum *) NULL);
162  assert(green != (Quantum *) NULL);
163  assert(blue != (Quantum *) NULL);
164  r=3.2404542*X-1.5371385*Y-0.4985314*Z;
165  g=(-0.9692660)*X+1.8760108*Y+0.0415560*Z;
166  b=0.0556434*X-0.2040259*Y+1.0572252*Z;
170 }
171 
172 #if defined(__cplusplus) || defined(c_plusplus)
173 }
174 #endif
175 
176 #endif
MagickExport MagickRealType EncodePixelGamma(const MagickRealType pixel)
Definition: pixel.c:351
#define D65X
Definition: gem-private.h:27
MagickDoubleType MagickRealType
Definition: magick-type.h:125
#define CIEK
Definition: gem-private.h:31
#define CIEEpsilon
Definition: gem-private.h:30
static void ConvertRGBToXYZ(const Quantum red, const Quantum green, const Quantum blue, double *X, double *Y, double *Z)
Definition: gem-private.h:85
#define D65Z
Definition: gem-private.h:29
#define D65Y
Definition: gem-private.h:28
static Quantum ClampToQuantum(const MagickRealType quantum)
Definition: quantum.h:88
MagickExport MagickRealType DecodePixelGamma(const MagickRealType pixel)
Definition: pixel.c:255
static void ConvertXYZToRGB(const double X, const double Y, const double Z, Quantum *red, Quantum *green, Quantum *blue)
Definition: gem-private.h:153
static double PerceptibleReciprocal(const double x)
Definition: pixel-accessor.h:124
static void ConvertLuvToXYZ(const double L, const double u, const double v, double *X, double *Y, double *Z)
Definition: gem-private.h:132
static void ConvertXYZToLuv(const double X, const double Y, const double Z, double *L, double *u, double *v)
Definition: gem-private.h:64
#define QuantumScale
Definition: magick-type.h:120
static void ConvertXYZToLab(const double X, const double Y, const double Z, double *L, double *a, double *b)
Definition: gem-private.h:104
unsigned short Quantum
Definition: magick-type.h:85
static void ConvertLabToXYZ(const double L, const double a, const double b, double *X, double *Y, double *Z)
Definition: gem-private.h:33
#define QuantumRange
Definition: magick-type.h:86