1 /*
2 Copyright 1999-2016 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.
6 obtain a copy of the License at
7
8 http://www.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 "MagickCore/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 extern MagickPrivate double
34 GenerateDifferentialNoise(RandomInfo *,const Quantum,const NoiseType,
35 const double);
36
37 extern MagickPrivate size_t
38 GetOptimalKernelWidth(const double,const double),
39 GetOptimalKernelWidth1D(const double,const double),
40 GetOptimalKernelWidth2D(const double,const double);
41
42 extern MagickPrivate void
43 ConvertHCLToRGB(const double,const double,const double,double *,double *,
44 double *),
45 ConvertHCLpToRGB(const double,const double,const double,double *,double *,
46 double *),
47 ConvertHSBToRGB(const double,const double,const double,double *,double *,
48 double *),
49 ConvertHSIToRGB(const double,const double,const double,double *,double *,
50 double *),
51 ConvertHSVToRGB(const double,const double,const double,double *,double *,
52 double *),
53 ConvertHWBToRGB(const double,const double,const double,double *,double *,
54 double *),
55 ConvertLCHabToRGB(const double,const double,const double,double *,double *,
56 double *),
57 ConvertLCHuvToRGB(const double,const double,const double,double *,double *,
58 double *),
59 ConvertRGBToHCL(const double,const double,const double,double *,double *,
60 double *),
61 ConvertRGBToHCLp(const double,const double,const double,double *,double *,
62 double *),
63 ConvertRGBToHSB(const double,const double,const double,double *,double *,
64 double *),
65 ConvertRGBToHSI(const double,const double,const double,double *,double *,
66 double *),
67 ConvertRGBToHSV(const double,const double,const double,double *,double *,
68 double *),
69 ConvertRGBToHWB(const double,const double,const double,double *,double *,
70 double *),
71 ConvertRGBToLCHab(const double,const double,const double,double *,double *,
72 double *),
73 ConvertRGBToLCHuv(const double,const double,const double,double *,double *,
74 double *);
75
ConvertLabToXYZ(const double L,const double a,const double b,double * X,double * Y,double * Z)76 static inline void ConvertLabToXYZ(const double L,const double a,const double b,
77 double *X,double *Y,double *Z)
78 {
79 double
80 x,
81 y,
82 z;
83
84 assert(X != (double *) NULL);
85 assert(Y != (double *) NULL);
86 assert(Z != (double *) NULL);
87 y=(L+16.0)/116.0;
88 x=y+a/500.0;
89 z=y-b/200.0;
90 if ((x*x*x) > CIEEpsilon)
91 x=(x*x*x);
92 else
93 x=(116.0*x-16.0)/CIEK;
94 if ((y*y*y) > CIEEpsilon)
95 y=(y*y*y);
96 else
97 y=L/CIEK;
98 if ((z*z*z) > CIEEpsilon)
99 z=(z*z*z);
100 else
101 z=(116.0*z-16.0)/CIEK;
102 *X=D65X*x;
103 *Y=D65Y*y;
104 *Z=D65Z*z;
105 }
106
ConvertLuvToXYZ(const double L,const double u,const double v,double * X,double * Y,double * Z)107 static inline void ConvertLuvToXYZ(const double L,const double u,const double v,
108 double *X,double *Y,double *Z)
109 {
110 assert(X != (double *) NULL);
111 assert(Y != (double *) NULL);
112 assert(Z != (double *) NULL);
113 if (L > (CIEK*CIEEpsilon))
114 *Y=(double) pow((L+16.0)/116.0,3.0);
115 else
116 *Y=L/CIEK;
117 *X=((*Y*((39.0*L/(v+13.0*L*(9.0*D65Y/(D65X+15.0*D65Y+3.0*D65Z))))-5.0))+
118 5.0*(*Y))/((((52.0*L/(u+13.0*L*(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z))))-1.0)/
119 3.0)-(-1.0/3.0));
120 *Z=(*X*(((52.0*L/(u+13.0*L*(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z))))-1.0)/3.0))-
121 5.0*(*Y);
122 }
123
ConvertRGBToXYZ(const double red,const double green,const double blue,double * X,double * Y,double * Z)124 static inline void ConvertRGBToXYZ(const double red,const double green,
125 const double blue,double *X,double *Y,double *Z)
126 {
127 double
128 b,
129 g,
130 r;
131
132 /*
133 Convert RGB to XYZ colorspace.
134 */
135 assert(X != (double *) NULL);
136 assert(Y != (double *) NULL);
137 assert(Z != (double *) NULL);
138 r=QuantumScale*DecodePixelGamma(red);
139 g=QuantumScale*DecodePixelGamma(green);
140 b=QuantumScale*DecodePixelGamma(blue);
141 *X=0.4124564*r+0.3575761*g+0.1804375*b;
142 *Y=0.2126729*r+0.7151522*g+0.0721750*b;
143 *Z=0.0193339*r+0.1191920*g+0.9503041*b;
144 }
145
ConvertXYZToLab(const double X,const double Y,const double Z,double * L,double * a,double * b)146 static inline void ConvertXYZToLab(const double X,const double Y,const double Z,
147 double *L,double *a,double *b)
148 {
149 double
150 x,
151 y,
152 z;
153
154 assert(L != (double *) NULL);
155 assert(a != (double *) NULL);
156 assert(b != (double *) NULL);
157 if ((X/D65X) > CIEEpsilon)
158 x=pow(X/D65X,1.0/3.0);
159 else
160 x=(CIEK*X/D65X+16.0)/116.0;
161 if ((Y/D65Y) > CIEEpsilon)
162 y=pow(Y/D65Y,1.0/3.0);
163 else
164 y=(CIEK*Y/D65Y+16.0)/116.0;
165 if ((Z/D65Z) > CIEEpsilon)
166 z=pow(Z/D65Z,1.0/3.0);
167 else
168 z=(CIEK*Z/D65Z+16.0)/116.0;
169 *L=((116.0*y)-16.0)/100.0;
170 *a=(500.0*(x-y))/255.0+0.5;
171 *b=(200.0*(y-z))/255.0+0.5;
172 }
173
ConvertXYZToLuv(const double X,const double Y,const double Z,double * L,double * u,double * v)174 static inline void ConvertXYZToLuv(const double X,const double Y,const double Z,
175 double *L,double *u,double *v)
176 {
177 double
178 alpha;
179
180 assert(L != (double *) NULL);
181 assert(u != (double *) NULL);
182 assert(v != (double *) NULL);
183 if ((Y/D65Y) > CIEEpsilon)
184 *L=(double) (116.0*pow(Y/D65Y,1.0/3.0)-16.0);
185 else
186 *L=CIEK*(Y/D65Y);
187 alpha=PerceptibleReciprocal(X+15.0*Y+3.0*Z);
188 *u=13.0*(*L)*((4.0*alpha*X)-(4.0*D65X/(D65X+15.0*D65Y+3.0*D65Z)));
189 *v=13.0*(*L)*((9.0*alpha*Y)-(9.0*D65Y/(D65X+15.0*D65Y+3.0*D65Z)));
190 *L/=100.0;
191 *u=(*u+134.0)/354.0;
192 *v=(*v+140.0)/262.0;
193 }
194
ConvertXYZToRGB(const double X,const double Y,const double Z,double * red,double * green,double * blue)195 static inline void ConvertXYZToRGB(const double X,const double Y,const double Z,
196 double *red,double *green,double *blue)
197 {
198 double
199 b,
200 g,
201 r;
202
203 assert(red != (double *) NULL);
204 assert(green != (double *) NULL);
205 assert(blue != (double *) NULL);
206 r=3.2404542*X-1.5371385*Y-0.4985314*Z;
207 g=(-0.9692660)*X+1.8760108*Y+0.0415560*Z;
208 b=0.0556434*X-0.2040259*Y+1.0572252*Z;
209 *red=EncodePixelGamma(QuantumRange*r);
210 *green=EncodePixelGamma(QuantumRange*g);
211 *blue=EncodePixelGamma(QuantumRange*b);
212 }
213
214 #if defined(__cplusplus) || defined(c_plusplus)
215 }
216 #endif
217
218 #endif
219