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color.c
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color.c
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/*
Color conversions
Copyright (c) 2011, Cory Nelson ([email protected])
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Some notes:
- Performance is important, but takes a back seat to accuracy.
- Constants are expressed as rationals when possible. When not, they are given to 96 bits of precision.
- Care has been taken to allow emitting of high-accuracy FMA instructions.
- Specialized shortcuts between some colorspaces have been made to improve performance and accuracy.
*/
#define COLOR_EXPORTS
#define STRICT
#define NOMINMAX
#define WIN32_LEAN_AND_MEAN
#include <math.h>
#include <assert.h>
#include <stddef.h>
#include "color.h"
static double const COLOR_REF_X = 31271.0/32902.0;
static double const COLOR_REF_Xr = 32902.0/31271.0;
//static double const COLOR_REF_Y = 1.0;
//static double const COLOR_REF_Yr = 1.0;
static double const COLOR_REF_Z = 35827.0/32902.0;
static double const COLOR_REF_Zr = 32902.0/35827.0;
static double const COLOR_REF_U13 = 813046.0/316141.0; // X * 4 / (X + Y * 15 + Z * 3) * 13
static double const COLOR_REF_V13 = 1924767.0/316141.0; // Y * 9 / (X + Y * 15 + Z * 3) * 13
__declspec(align(64)) double const rgb_to_yuv[][8] =
{
// Rec. 601
{ 0.299, 0.587, 0.114, -32591.0/221500.0, -63983.0/221500.0, -72201.0/140200.0, -7011.0/70100.0 },
// Rec. 709
{ 0.2126, 0.7152, 0.0722, -115867.0/1159750.0, -194892.0/579875.0, -54981.0/98425.0, -44403.0/787400.0 },
// SMPTE 240M
{ 0.212, 0.701, 0.087, -11554.0/114125.0, -76409.0/228250.0, -86223.0/157600.0, -10701.0/157600.0 },
// FCC
{ 0.3, 0.59, 0.11, -327.0/2225.0, -6431.0/22250.0, -7257.0/14000.0, -1353.0/14000.0 }
};
__declspec(align(32)) double const yuv_to_rgb[][4] =
{
// Rec. 601
{ 701.0/615.0, -25251.0/63983.0, -209599.0/361005.0, 443.0/218.0 },
// Rec. 709
{ 3937.0/3075.0, -1674679.0/7795680.0, -4185031.0/10996200.0, 4639.0/2180.0 },
// SMPTE 240M
{ 788.0/615.0, -79431.0/305636.0, -167056.0/431115.0, 913.0/436.0 },
// FCC
{ 140.0/123.0, -4895.0/12862.0, -1400.0/2419.0, 445.0/218.0 }
};
static void color_RGB8_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_RGB8);
dst[0] = src->RGB8.R;
dst[1] = src->RGB8.G;
dst[2] = src->RGB8.B;
}
static void color_RGB8_to_RGB(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_RGB8);
R = c->RGB8.R * (1.0 / 255.0);
G = c->RGB8.G * (1.0 / 255.0);
B = c->RGB8.B * (1.0 / 255.0);
c->RGB.R = R;
c->RGB.G = G;
c->RGB.B = B;
c->type = COLOR_RGB;
}
static double rgb8_to_linear(uint8_t c)
{
return c >= 11 ? pow(c * (40.0 / 10761.0) + (11.0 / 211.0), 2.4) : c * (5.0 / 16473.0);
}
static void color_RGB8_to_LinearRGB(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_RGB8);
R = rgb8_to_linear(c->RGB8.R);
G = rgb8_to_linear(c->RGB8.G);
B = rgb8_to_linear(c->RGB8.B);
c->LinearRGB.R = R;
c->LinearRGB.G = G;
c->LinearRGB.B = B;
c->type = COLOR_LINEAR_RGB;
}
static void color_RGB_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_RGB);
dst[0] = src->RGB.R;
dst[1] = src->RGB.G;
dst[2] = src->RGB.B;
}
static void color_RGB_to_RGB8(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = c->RGB.R * 255.0 + 0.5;
G = c->RGB.G * 255.0 + 0.5;
B = c->RGB.B * 255.0 + 0.5;
c->type = COLOR_RGB8;
c->RGB8.R = R < 0.0 ? 0 : R > 255.0 ? 255 : (uint8_t)R;
c->RGB8.G = G < 0.0 ? 0 : G > 255.0 ? 255 : (uint8_t)G;
c->RGB8.B = B < 0.0 ? 0 : B > 255.0 ? 255 : (uint8_t)B;
}
static double rgb_to_linear(double c)
{
return c > (0.0031308 * 12.92) ? pow(c * (1.0 / 1.055) + (0.055 / 1.055), 2.4) : c * (1.0 / 12.92);
}
static void color_RGB_to_LinearRGB(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = rgb_to_linear(c->RGB.R);
G = rgb_to_linear(c->RGB.G);
B = rgb_to_linear(c->RGB.B);
c->LinearRGB.R = R;
c->LinearRGB.G = G;
c->LinearRGB.B = B;
c->type = COLOR_LINEAR_RGB;
}
static void color_RGB_to_HSL(struct color *c, uint8_t extra)
{
double R, G, B, min, max, delta, L;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = c->RGB.R;
G = c->RGB.G;
B = c->RGB.B;
min = R < G ? R : G;
if(B < min) min = B;
max = R > G ? R : G;
if(B > max) max = B;
delta = max - min;
L = (max + min) * 0.5;
c->HSL.L = L;
c->type = COLOR_HSL;
if(fabs(delta) > 0.0)
{
c->HSL.S =
L < 0.5 ? delta / (max + min) :
delta / (2.0 - max - min);
c->HSL.H =
max == R ? (G - B) / delta :
max == G ? (B - R) / delta + 2.0 :
(R - G) / delta + 4.0;
return;
}
c->HSL.S = 0.0;
c->HSL.H = 0.0;
}
static void color_RGB_to_HSV(struct color *c, uint8_t extra)
{
double R, G, B, min, max, delta;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = c->RGB.R;
G = c->RGB.G;
B = c->RGB.B;
min = R < G ? R : G;
if(B < min) min = B;
max = R > G ? R : G;
if(B > max) max = B;
delta = max - min;
c->HSV.V = max;
c->type = COLOR_HSV;
if(fabs(delta) > 0.0)
{
c->HSV.S = delta / max;
c->HSV.H =
max == R ? (G - B) / delta :
max == G ? (B - R) / delta + 2.0 :
(R - G) / delta + 4.0;
return;
}
c->HSV.S = 0.0;
c->HSV.H = 0.0;
}
static void color_RGB_to_YUV(struct color *c, uint8_t extra)
{
double R, G, B;
double const *mat;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = c->RGB.R;
G = c->RGB.G;
B = c->RGB.B;
mat = rgb_to_yuv[extra & COLOR_YUV_MAT_MASK];
c->YUV.Y = R * mat[0] + G * mat[1] + B * mat[2];
c->YUV.U = R * mat[3] + G * mat[4] + B * 0.436;
c->YUV.V = R * 0.615 + G * mat[5] + B * mat[6];
c->type = COLOR_YUV;
c->extra = extra;
}
static void color_RGB_to_YDbDr(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = c->RGB.R;
G = c->RGB.G;
B = c->RGB.B;
c->YDbDr.Y = R * (299.0/1000.0) + G * (587.0/1000.0) + B * (57.0/500.0);
c->YDbDr.Db = R * (-398567.0/886000.0) + G * (-782471.0/886000.0) + B * (1333.0/1000.0);
c->YDbDr.Dr = R * (1333.0/1000.0) + G * (-782471.0/701000.0) + B * (-75981.0/350500.0);
c->type = COLOR_YDBDR;
}
static void color_RGB_to_YIQ(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_RGB);
R = c->RGB.R;
G = c->RGB.G;
B = c->RGB.B;
c->YIQ.Y = R * 0.299 + G * 0.587 + B * 0.114;
c->YIQ.I = R * 0.5957 + G * -0.2744766323826577035751015648 + B * -0.3212233676173422964248984352;
c->YIQ.Q = R * -0.2114956266791979792324116478 + G * 0.5226 + B * -0.3111043733208020207675883522;
c->type = COLOR_YIQ;
}
static uint8_t linear_to_rgb8(double c)
{
if(c <= 0.0)
{
return 0;
}
if(c <= 0.0031308)
{
return (uint8_t)(int)(c * 3294.6 + 0.5);
}
if(c < 1.0)
{
return (uint8_t)(int)(pow(c, 1.0 / 2.4) * 269.025 - (14.025 - 0.5));
}
return 255;
}
static void color_LinearRGB_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_LINEAR_RGB);
dst[0] = src->LinearRGB.R;
dst[1] = src->LinearRGB.G;
dst[2] = src->LinearRGB.B;
}
static void color_LinearRGB_to_RGB8(struct color *c, uint8_t extra)
{
uint8_t R, G, B;
assert(c != NULL);
assert(c->type == COLOR_LINEAR_RGB);
R = linear_to_rgb8(c->LinearRGB.R);
G = linear_to_rgb8(c->LinearRGB.G);
B = linear_to_rgb8(c->LinearRGB.B);
c->RGB8.R = R;
c->RGB8.G = G;
c->RGB8.B = B;
c->type = COLOR_RGB8;
}
static double linear_to_rgb(double c)
{
return c > 0.0031308 ? pow(c, 1.0 / 2.4) * 1.055 - 0.055 : c * 12.92;
}
static void color_LinearRGB_to_RGB(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_LINEAR_RGB);
R = linear_to_rgb(c->LinearRGB.R);
G = linear_to_rgb(c->LinearRGB.G);
B = linear_to_rgb(c->LinearRGB.B);
c->RGB.R = R;
c->RGB.G = G;
c->RGB.B = B;
c->type = COLOR_RGB;
}
static void color_LinearRGB_to_XYZ(struct color *c, uint8_t extra)
{
double R, G, B;
assert(c != NULL);
assert(c->type == COLOR_LINEAR_RGB);
R = c->LinearRGB.R;
G = c->LinearRGB.G;
B = c->LinearRGB.B;
c->XYZ.X = R * (5067776.0/12288897.0) + G * (4394405.0/12288897.0) + B * (4435075.0/24577794.0);
c->XYZ.Y = R * (871024.0/4096299.0) + G * (8788810.0/12288897.0) + B * (887015.0/12288897.0);
c->XYZ.Z = R * (79184.0/4096299.0) + G * (4394405.0/36866691.0) + B * (70074185.0/73733382.0);
c->type = COLOR_XYZ;
}
static double xyz_to_lab(double c)
{
return c > 216.0 / 24389.0 ? pow(c, 1.0 / 3.0) : c * (841.0/108.0) + (4.0/29.0);
}
static void color_LinearRGB_to_Lab(struct color *c, uint8_t extra)
{
double R, G, B, X, Y, Z;
assert(c != NULL);
assert(c->type == COLOR_LINEAR_RGB);
R = c->LinearRGB.R;
G = c->LinearRGB.G;
B = c->LinearRGB.B;
// linear sRGB -> normalized XYZ (X,Y,Z are all in 0...1)
X = xyz_to_lab(R * (10135552.0/23359437.0) + G * (8788810.0/23359437.0) + B * (4435075.0/23359437.0));
Y = xyz_to_lab(R * (871024.0/4096299.0) + G * (8788810.0/12288897.0) + B * (887015.0/12288897.0));
Z = xyz_to_lab(R * (158368.0/8920923.0) + G * (8788810.0/80288307.0) + B * (70074185.0/80288307.0));
// normalized XYZ -> Lab
c->Lab.L = Y * 116.0 - 16.0;
c->Lab.a = (X - Y) * 500.0;
c->Lab.b = (Y - Z) * 200.0;
c->type = COLOR_LAB;
}
static void color_HSL_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_HSL);
dst[0] = src->HSL.H;
dst[1] = src->HSL.S;
dst[2] = src->HSL.L;
}
static void finish_HSL_to_RGB(struct color *c, double h, double C, double m)
{
static const char rgb_tbl[][3] =
{
{ 0, 2, 1 },
{ 2, 0, 1 },
{ 1, 0, 2 },
{ 1, 2, 0 },
{ 2, 1, 0 },
{ 0, 1, 2 }
};
double absh, h2, vars[3];
int idx;
// clamps hue to [0, 2), and returns (1.0 - fabs(hue - 1.0))
absh = fabs(h);
h2 =
absh >= 2.0 ? floor(h * 0.5) * -2.0 + h - 1.0 :
h < 0.0 ? h + 1.0 :
h - 1.0;
h2 = 1.0 - fabs(h2);
// clamps hue to [0, 6), for indexing into rgb_tbl.
idx = (int)
(absh >= 6.0 ? floor(h * (1.0 / 6.0)) * -6.0 + h :
h < 0.0 ? h + 6.0 :
h);
assert(idx >= 0 && idx <= 5);
// finish HSL->RGB.
vars[0] = C + m;
vars[1] = m;
vars[2] = C * h2 + m;
c->RGB.R = vars[rgb_tbl[idx][0]];
c->RGB.G = vars[rgb_tbl[idx][1]];
c->RGB.B = vars[rgb_tbl[idx][2]];
}
static void color_HSL_to_RGB(struct color *c, uint8_t extra)
{
double H, S, L, C, m;
assert(c != NULL);
assert(c->type == COLOR_HSL);
H = c->HSL.H;
S = c->HSL.S;
L = c->HSL.L;
c->type = COLOR_RGB;
if(fabs(S) > 0.0)
{
C = (1.0 - fabs(L * 2.0 - 1.0)) * S;
m = C * -0.5 + L;
finish_HSL_to_RGB(c, H, C, m);
return;
}
c->RGB.R = L; c->RGB.G = L; c->RGB.B = L;
}
static void color_HSV_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_HSV);
dst[0] = src->HSV.H;
dst[1] = src->HSV.S;
dst[2] = src->HSV.V;
}
static void color_HSV_to_RGB(struct color *c, uint8_t extra)
{
double H, S, V, C, m;
assert(c != NULL);
assert(c->type == COLOR_HSV);
H = c->HSV.H;
S = c->HSV.S;
V = c->HSV.V;
c->type = COLOR_RGB;
if(fabs(S) > 0.0)
{
C = V * S;
m = V - C;
finish_HSL_to_RGB(c, H, C, m);
return;
}
c->RGB.R = V; c->RGB.G = V; c->RGB.B = V;
}
static void color_YUV_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_YUV);
dst[0] = src->YUV.Y;
dst[1] = src->YUV.U;
dst[2] = src->YUV.V;
}
static void color_YUV_to_RGB(struct color *c, uint8_t extra)
{
double Y, U, V;
double const *mat;
assert(c != NULL);
assert(c->type == COLOR_YUV);
Y = c->YUV.Y;
U = c->YUV.U;
V = c->YUV.V;
mat = yuv_to_rgb[c->extra & COLOR_YUV_MAT_MASK];
c->RGB.R = Y + V * mat[0];
c->RGB.G = Y + U * mat[1] + V * mat[2];
c->RGB.B = Y + U * mat[3];
c->type = COLOR_RGB;
c->extra = 0;
}
static void color_YUV_to_YUV(struct color *c, uint8_t extra)
{
assert(c != NULL);
assert(c->type == COLOR_YUV);
assert(c->extra != extra);
color_YUV_to_RGB(c, extra);
color_RGB_to_YUV(c, extra);
assert(c->extra == extra);
}
static void color_YUV_to_YCbCr(struct color *c, uint8_t extra)
{
double Y, U, V;
assert(c != NULL);
assert(c->type == COLOR_YUV);
if((c->extra & COLOR_YUV_MAT_MASK) != (extra & COLOR_YUV_MAT_MASK))
{
color_YUV_to_YUV(c, extra);
}
Y = c->YUV.Y;
U = c->YUV.U;
V = c->YUV.V;
if(extra & COLOR_YCBCR_FULL_RANGE)
{
Y = Y * 255.0 + 0.5;
U = U * (31875.0/109.0) + 128;
V = V * (8500.0/41.0) + 128;
}
else
{
Y = Y * 219.0 + 16.5;
U = U * (28000.0/109.0) + 144;
V = V * (22400.0/123.0) + 144;
}
c->YCbCr.Y = Y < 0.0 ? 0 : Y > 255.0 ? 255 : (int)Y;
c->YCbCr.Cb = U < 0.0 ? 0 : U > 255.0 ? 255 : (int)U;
c->YCbCr.Cr = V < 0.0 ? 0 : V > 255.0 ? 255 : (int)V;
c->type = COLOR_YCBCR;
c->extra = extra;
}
static void color_YCbCr_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_YCBCR);
dst[0] = src->YCbCr.Y;
dst[1] = src->YCbCr.Cb;
dst[2] = src->YCbCr.Cr;
}
static void color_YCbCr_to_YUV(struct color *c, uint8_t extra)
{
double Y, U, V;
assert(c != NULL);
assert(c->type == COLOR_YCBCR);
Y = c->YCbCr.Y;
U = c->YCbCr.Cb;
V = c->YCbCr.Cr;
if(c->extra & COLOR_YCBCR_FULL_RANGE)
{
Y *= (1.0 / 255.0);
U = U * (109.0/31875.0) - 0.436;
V = V * (41.0/8500.0) - 0.615;
}
else
{
Y = Y * (1.0/219.0) - (16.0/219.0);
U = U * (109.0/28000.0) - 0.558625;
V = V * (123.0/22400.0) - 0.78796875;
}
c->YUV.Y = Y;
c->YUV.U = U;
c->YUV.V = V;
c->type = COLOR_YUV;
c->extra &= ~(uint8_t)COLOR_YCBCR_FULL_RANGE;
if((c->extra & COLOR_YUV_MAT_MASK) != (extra & COLOR_YUV_MAT_MASK))
{
color_YUV_to_YUV(c, extra);
}
}
static void color_YCbCr_to_YCbCr(struct color *c, uint8_t extra)
{
assert(c != NULL);
assert(c->type == COLOR_YCBCR);
assert(c->extra != extra);
color_YCbCr_to_YUV(c, extra);
color_YUV_to_YCbCr(c, extra);
assert(c->extra == extra);
}
static void color_YDbDr_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_YDBDR);
dst[0] = src->YDbDr.Y;
dst[1] = src->YDbDr.Db;
dst[2] = src->YDbDr.Dr;
}
static void color_YDbDr_to_RGB(struct color *c, uint8_t extra)
{
double Y, Db, Dr;
assert(c != NULL);
assert(c->type == COLOR_YDBDR);
Y = c->YDbDr.Y;
Db = c->YDbDr.Db;
Dr = c->YDbDr.Dr;
c->RGB.R = Y + Dr * (701.0/1333.0);
c->RGB.G = Y + Db * (-101004.0/782471.0) + Dr * (-209599.0/782471.0);
c->RGB.B = Y + Db * (886.0/1333.0);
c->type = COLOR_RGB;
}
static void color_YDbDr_to_YIQ(struct color *c, uint8_t extra)
{
double Y, Db, Dr;
assert(c != NULL);
assert(c->type == COLOR_YDBDR);
Y = c->YDbDr.Y;
Db = c->YDbDr.Db;
Dr = c->YDbDr.Dr;
c->YUV.Y = Y;
c->YUV.U = Db * -1.780759334211551067290090872e-1 + Dr * 3.867911188667345780375729105e-1;
c->YUV.V = Y * 3.155443620884047221646914261e-30 + Db * -2.742395246410785275938007739e-1 + Dr * -2.512094867865302853146089398e-1;
c->type = COLOR_YIQ;
}
static void color_YIQ_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_YIQ);
dst[0] = src->YIQ.Y;
dst[1] = src->YIQ.I;
dst[2] = src->YIQ.Q;
}
static void color_YIQ_to_RGB(struct color *c, uint8_t extra)
{
double Y, I, Q;
assert(c != NULL);
assert(c->type == COLOR_YIQ);
Y = c->YIQ.Y;
I = c->YIQ.I;
Q = c->YIQ.Q;
c->RGB.R = Y + I * 9.563000521420394701478042310e-1 + Q * -6.209682015704038246103012680e-1;
c->RGB.G = Y + I * -2.720883840788609953919979558e-1 + Q * 6.473748500336683799608873068e-1;
c->RGB.B = Y + I * -1.107173983650687695430619869e0 + Q * -1.704732848247478907706673421e0;
c->type = COLOR_RGB;
}
static void color_YIQ_to_YDbDr(struct color *c, uint8_t extra)
{
double Y, I, Q;
assert(c != NULL);
assert(c->type == COLOR_YIQ);
Y = c->YIQ.Y;
I = c->YIQ.I;
Q = c->YIQ.Q;
c->YDbDr.Y = Y + I * 6.310887241768094443293828522e-30;
c->YDbDr.Db = I * -1.665759503618924038384894227e0 + Q * -2.564795583198520749405186986e0;
c->YDbDr.Dr = Y * 1.009741958682895110927012564e-28 + I * 1.818470712561110718554954408e0 + Q * -1.180813998136017543802470171e0;
c->type = COLOR_YDBDR;
}
static void color_XYZ_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_XYZ);
dst[0] = src->XYZ.X;
dst[1] = src->XYZ.Y;
dst[2] = src->XYZ.Z;
}
static void color_XYZ_to_LinearRGB(struct color *c, uint8_t extra)
{
double X, Y, Z;
assert(c != NULL);
assert(c->type == COLOR_XYZ);
X = c->XYZ.X;
Y = c->XYZ.Y;
Z = c->XYZ.Z;
c->LinearRGB.R = X * (641589.0/197960.0) + Y * (-608687.0/395920.0) + Z * (-49353.0/98980.0);
c->LinearRGB.G = X * (-42591639.0/43944050.0) + Y * (82435961.0/43944050.0) + Z * (1826061.0/43944050.0);
c->LinearRGB.B = X * (49353.0/887015.0) + Y * (-180961.0/887015.0) + Z * (49353.0/46685.0);
c->type = COLOR_LINEAR_RGB;
}
static void color_XYZ_to_xyY(struct color *c, uint8_t extra)
{
double X, Y, div;
assert(c != NULL);
assert(c->type == COLOR_XYZ);
X = c->XYZ.X;
Y = c->XYZ.Y;
div = X + Y + c->XYZ.Z;
c->xyY.Y = Y;
c->type = COLOR_XYY;
if(fabs(div) > 0.0)
{
c->xyY.x = X / div;
c->xyY.y = Y / div;
return;
}
c->xyY.x = X;
c->xyY.y = Y;
}
static void color_XYZ_to_Lab(struct color *c, uint8_t extra)
{
double X, Y, Z;
assert(c != NULL);
assert(c->type == COLOR_XYZ);
X = c->XYZ.X;
Y = c->XYZ.Y;
Z = c->XYZ.Z;
X = X > 3377268.0/401223439.0 ? pow(X * COLOR_REF_Xr, 1.0/3.0) : X * (13835291.0/1688634.0) + (4.0/29.0);
Y = Y > 216.0/24389.0 ? pow(Y, 1.0/3.0) : Y * (841.0/108.0) + (4.0/29.0);
Z = Z > 3869316.0/401223439.0 ? pow(Z * COLOR_REF_Zr, 1.0/3.0) : Z * (13835291.0/1934658.0) + (4.0/29.0);
c->Lab.L = Y * 116.0 - 16.0;
c->Lab.a = (X - Y) * 500.0;
c->Lab.b = (Y - Z) * 200.0;
c->type = COLOR_LAB;
}
static void color_XYZ_to_Luv(struct color *c, uint8_t extra)
{
double X, Y, div, L;
assert(c != NULL);
assert(c->type == COLOR_XYZ);
X = c->XYZ.X;
Y = c->XYZ.Y;
div = X + Y * 15.0 + c->XYZ.Z * 3.0;
L = Y > 216.0/24389.0 ? pow(Y, 1.0 / 3.0) * 116.0 - 16.0 : Y * (24389.0/27.0);
if(fabs(div) > 0.0)
{
div = 1.0 / div;
X *= div;
Y *= div;
}
c->Luv.L = L;
c->Luv.u = (X * 52.0 - COLOR_REF_U13) * L;
c->Luv.v = (Y * 117.0 - COLOR_REF_V13) * L;
c->type = COLOR_LUV;
}
static void color_xyY_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_XYY);
dst[0] = src->xyY.x;
dst[1] = src->xyY.y;
dst[2] = src->xyY.Y;
}
static void color_xyY_to_XYZ(struct color *c, uint8_t extra)
{
double x, y, Y;
assert(c != NULL);
assert(c->type == COLOR_XYY);
x = c->xyY.x;
y = c->xyY.y;
Y = c->xyY.Y;
c->type = COLOR_XYZ;
if(fabs(y) > 0.0)
{
double mul = Y / y;
c->XYZ.X = x * mul;
c->XYZ.Y = Y;
c->XYZ.Z = (1.0 - x - y) * mul;
return;
}
c->XYZ.X = 0.0;
c->XYZ.Y = 0.0;
c->XYZ.Z = 0.0;
}
static void color_Lab_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);
assert(src->type == COLOR_LAB);
dst[0] = src->Lab.L;
dst[1] = src->Lab.a;
dst[2] = src->Lab.b;
}
static void color_Lab_to_LinearRGB(struct color *c, uint8_t extra)
{
double X, Y, Z;
assert(c != NULL);
assert(c->type == COLOR_LAB);
// Lab -> normalized XYZ (X,Y,Z are all in 0...1)
Y = c->Lab.L * (1.0/116.0) + 16.0/116.0;
X = c->Lab.a * (1.0/500.0) + Y;
Z = c->Lab.b * (-1.0/200.0) + Y;
X = X > 6.0/29.0 ? X * X * X : X * (108.0/841.0) - 432.0/24389.0;
Y = c->Lab.L > 8.0 ? Y * Y * Y : c->Lab.L * (27.0/24389.0);
Z = Z > 6.0/29.0 ? Z * Z * Z : Z * (108.0/841.0) - 432.0/24389.0;
// normalized XYZ -> linear sRGB
c->LinearRGB.R = X * (1219569.0/395920.0) + Y * (-608687.0/395920.0) + Z * (-107481.0/197960.0);
c->LinearRGB.G = X * (-80960619.0/87888100.0) + Y * (82435961.0/43944050.0) + Z * (3976797.0/87888100.0);
c->LinearRGB.B = X * (93813.0/1774030.0) + Y * (-180961.0/887015.0) + Z * (107481.0/93370.0);
c->type = COLOR_LINEAR_RGB;
}
static void color_Lab_to_XYZ(struct color *c, uint8_t extra)
{
double L, X, Y, Z;
assert(c != NULL);
assert(c->type == COLOR_LAB);
L = c->Lab.L;
Y = L * (1.0/116.0) + 16.0/116.0;
X = c->Lab.a * (1.0/500.0) + Y;
Z = c->Lab.b * (-1.0/200.0) + Y;
c->XYZ.X = X > 6.0/29.0 ? X * X * X * COLOR_REF_X : X * (1688634.0/13835291.0) - 6754536.0/401223439.0;
c->XYZ.Y = L > 8.0 ? Y * Y * Y : L * (27.0/24389.0);
c->XYZ.Z = Z > 6.0/29.0 ? Z * Z * Z * COLOR_REF_Z : Z * (1934658.0/13835291.0) - 7738632.0/401223439.0;
c->type = COLOR_XYZ;
}
static void color_Lab_to_LCHab(struct color *c, uint8_t extra)
{
double L, a, b;
assert(c != NULL);
assert(c->type == COLOR_LAB);
L = c->Lab.L;
a = c->Lab.a;
b = c->Lab.b;
c->LCHab.L = L;
c->LCHab.C = sqrt(a * a + b * b);
c->LCHab.h = atan2(b, a);
c->type = COLOR_LCHAB;
}
static void color_LCHab_extract(double *dst, struct color const *src)
{
assert(dst != NULL);
assert(src != NULL);