/**
* Copyright © 2016 Mattias Andrée <maandree@kth.se>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "libcolour.h"
#include <alloca.h>
#include <errno.h>
#include <math.h>
#include <string.h>
#define MARSHAL_VERSION 0
double libcolour_srgb_encode(double t)
{
double sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t <= 0.0031306684425217108 ? 12.92 * t : 1.055 * pow(t, 1 / 2.4) - 0.055;
return t * sign;
}
double libcolour_srgb_decode(double t)
{
double sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t <= 0.040448236277380506 ? t / 12.92 : pow((t + 0.055) / 1.055, 2.4);
return t * sign;
}
int libcolour_delta_e(const libcolour_colour_t* a, const libcolour_colour_t* b, double* e)
{
libcolour_cielab_t u, v;
u.model = v.model = LIBCOLOUR_CIELAB;
if (libcolour_convert(a, (libcolour_colour_t*)&u))
return -1;
if (libcolour_convert(b, (libcolour_colour_t*)&v))
return -1;
u.L -= v.L, u.L *= u.L;
u.a -= v.a, u.a *= u.a;
u.b -= v.b, u.b *= u.b;
*e = sqrt(u.L + u.a + u.b);
return 0;
}
#define eliminate(M, n, m) eliminate_(n, m, &(M))
static int eliminate_(size_t n, size_t m, double (*Mp)[n][m])
{
#define M (*Mp)
size_t r1, r2, c;
double d;
double* R1;
double* R2;
for (r1 = 0; r1 < n; r1++) {
R1 = M[r1];
if (R1[r1] == 0) {
for (r2 = r1 + 1; r2 < n; r2++)
if (M[r2][r1] != 0)
break;
if (r2 == n) {
errno = EDOM;
return -1;
}
R2 = M[r2];
for (c = 0; c < m; c++)
d = R1[c], R1[c] = R2[c], R2[c] = d;
}
d = R1[r1];
for (c = 0; c < m; c++)
R1[c] /= d;
for (r2 = r1 + 1; r2 < n; r2++) {
R2 = M[r2];
d = R2[r1];
for (c = 0; c < m; c++)
R2[c] -= R1[c] * d;
}
}
for (r1 = n; --r1;) {
R1 = M[r1];
for (r2 = r1; r2--;) {
R2 = M[r2];
d = R2[r1];
for (c = 0; c < m; c++)
R2[c] -= R1[c] * d;
}
}
return 0;
#undef M
}
int libcolour_proper(libcolour_colour_t* colour)
{
libcolour_colour_t r, g, b, w;
double m[3][4];
switch (colour->model) {
case LIBCOLOUR_CIELUV:
colour->cieluv.white.model = LIBCOLOUR_CIEXYZ;
break;
case LIBCOLOUR_CIELCHUV:
colour->cielchuv.white.model = LIBCOLOUR_CIEXYZ;
break;
case LIBCOLOUR_RGB:
colour->rgb.red.model = LIBCOLOUR_CIEXYY;
colour->rgb.green.model = LIBCOLOUR_CIEXYY;
colour->rgb.blue.model = LIBCOLOUR_CIEXYY;
colour->rgb.white.model = LIBCOLOUR_CIEXYY;
colour->rgb.red.Y = 1;
colour->rgb.green.Y = 1;
colour->rgb.blue.Y = 1;
r.model = g.model = b.model = w.model = LIBCOLOUR_CIEXYZ;
libcolour_convert((const libcolour_colour_t*)&colour->rgb.red, &r);
libcolour_convert((const libcolour_colour_t*)&colour->rgb.green, &g);
libcolour_convert((const libcolour_colour_t*)&colour->rgb.blue, &b);
libcolour_convert((const libcolour_colour_t*)&colour->rgb.white, &w);
m[0][0] = r.ciexyz.X, m[0][1] = g.ciexyz.X, m[0][2] = b.ciexyz.X, m[0][3] = w.ciexyz.X;
m[1][0] = r.ciexyz.Y, m[1][1] = g.ciexyz.Y, m[1][2] = b.ciexyz.Y, m[1][3] = w.ciexyz.Y;
m[2][0] = r.ciexyz.Z, m[2][1] = g.ciexyz.Z, m[2][2] = b.ciexyz.Z, m[2][3] = w.ciexyz.Z;
if (eliminate(m, 3, 4))
return -1;
colour->rgb.red.Y = m[0][3];
colour->rgb.green.Y = m[1][3];
colour->rgb.blue.Y = m[2][3];
break;
default:
break;
}
return 0;
}
static int get_primaries(libcolour_rgb_t* cs)
{
libcolour_colour_t r, g, b, w;
double Sr, Sg, Sb;
double M[3][6];
r.model = g.model = b.model = w.model = LIBCOLOUR_CIEXYZ;
r.ciexyz.Y = 1;
g.ciexyz.Y = 1;
b.ciexyz.Y = 1;
Sr = cs->M[1][0] * cs->white_r;
Sg = cs->M[1][1] * cs->white_g;
Sb = cs->M[1][2] * cs->white_b;
r.ciexyz.X = cs->M[0][0] / Sr, r.ciexyz.Z = cs->M[2][0] / Sr;
g.ciexyz.X = cs->M[0][1] / Sg, g.ciexyz.Z = cs->M[2][1] / Sg;
b.ciexyz.X = cs->M[0][2] / Sb, b.ciexyz.Z = cs->M[2][2] / Sb;
M[0][0] = r.ciexyz.X, M[0][1] = g.ciexyz.X, M[0][2] = b.ciexyz.X, M[0][3] = 1, M[0][4] = 0, M[0][5] = 0;
M[1][0] = r.ciexyz.Y, M[1][1] = g.ciexyz.Y, M[1][2] = b.ciexyz.Y, M[1][3] = 0, M[1][4] = 1, M[1][5] = 0;
M[2][0] = r.ciexyz.Z, M[2][1] = g.ciexyz.Z, M[2][2] = b.ciexyz.Z, M[2][3] = 0, M[2][4] = 0, M[2][5] = 1;
if (eliminate(M, 3, 6))
return -1;
memcpy(M[0], M[0] + 3, 3 * sizeof(double)), M[0][3] = Sr;
memcpy(M[1], M[1] + 3, 3 * sizeof(double)), M[1][3] = Sg;
memcpy(M[2], M[2] + 3, 3 * sizeof(double)), M[2][3] = Sb;
if (eliminate(M, 3, 4))
return -1;
w.ciexyz.X = M[0][3];
w.ciexyz.Y = M[1][3];
w.ciexyz.Z = M[2][3];
cs->red.model = LIBCOLOUR_CIEXYY;
cs->green.model = LIBCOLOUR_CIEXYY;
cs->blue.model = LIBCOLOUR_CIEXYY;
cs->white.model = LIBCOLOUR_CIEXYY;
libcolour_convert(&r, (libcolour_colour_t*)&cs->red);
libcolour_convert(&g, (libcolour_colour_t*)&cs->green);
libcolour_convert(&b, (libcolour_colour_t*)&cs->blue);
libcolour_convert(&w, (libcolour_colour_t*)&cs->white);
return 0;
}
static int get_matrices(libcolour_rgb_t* cs)
{
libcolour_colour_t r, g, b, w;
double M[3][6];
double Sr, Sg, Sb;
r.model = g.model = b.model = LIBCOLOUR_CIEXYZ;
w.model = LIBCOLOUR_CIEXYY;
libcolour_convert((const libcolour_colour_t*)&cs->red, &w), w.ciexyy.Y = 1, libcolour_convert(&w, &r);
libcolour_convert((const libcolour_colour_t*)&cs->green, &w), w.ciexyy.Y = 1, libcolour_convert(&w, &g);
libcolour_convert((const libcolour_colour_t*)&cs->blue, &w), w.ciexyy.Y = 1, libcolour_convert(&w, &b);
w.model = LIBCOLOUR_CIEXYZ;
libcolour_convert((const libcolour_colour_t*)&cs->white, &w);
M[0][0] = r.ciexyz.X, M[0][1] = g.ciexyz.X, M[0][2] = b.ciexyz.X, M[0][3] = 1, M[0][4] = 0, M[0][5] = 0;
M[1][0] = r.ciexyz.Y, M[1][1] = g.ciexyz.Y, M[1][2] = b.ciexyz.Y, M[1][3] = 0, M[1][4] = 1, M[1][5] = 0;
M[2][0] = r.ciexyz.Z, M[2][1] = g.ciexyz.Z, M[2][2] = b.ciexyz.Z, M[2][3] = 0, M[2][4] = 0, M[2][5] = 1;
if (eliminate(M, 3, 6))
return -1;
Sr = M[0][3] * w.ciexyz.X + M[0][4] * w.ciexyz.Y + M[0][5] * w.ciexyz.Z;
Sg = M[1][3] * w.ciexyz.X + M[1][4] * w.ciexyz.Y + M[1][5] * w.ciexyz.Z;
Sb = M[2][3] * w.ciexyz.X + M[2][4] * w.ciexyz.Y + M[2][5] * w.ciexyz.Z;
Sr /= cs->white_r;
Sg /= cs->white_g;
Sb /= cs->white_b;
cs->M[0][0] = Sr * r.ciexyz.X, cs->M[0][1] = Sg * g.ciexyz.X, cs->M[0][2] = Sb * b.ciexyz.X;
cs->M[1][0] = Sr * r.ciexyz.Y, cs->M[1][1] = Sg * g.ciexyz.Y, cs->M[1][2] = Sb * b.ciexyz.Y;
cs->M[2][0] = Sr * r.ciexyz.Z, cs->M[2][1] = Sg * g.ciexyz.Z, cs->M[2][2] = Sb * b.ciexyz.Z;
memcpy(M[0], cs->M[0], 3 * sizeof(double)), M[0][3] = 1, M[0][4] = 0, M[0][5] = 0;
memcpy(M[1], cs->M[1], 3 * sizeof(double)), M[1][3] = 0, M[1][4] = 1, M[1][5] = 0;
memcpy(M[2], cs->M[2], 3 * sizeof(double)), M[2][3] = 0, M[2][4] = 0, M[2][5] = 1;
if (eliminate(M, 3, 6))
return -1;
memcpy(cs->Minv[0], M[0] + 3, 3 * sizeof(double));
memcpy(cs->Minv[1], M[1] + 3, 3 * sizeof(double));
memcpy(cs->Minv[2], M[2] + 3, 3 * sizeof(double));
return 0;
}
#define invert(Minv, M, n) invert_(n, &(Minv), &(M))
static int invert_(size_t n, double (*Minvp)[n][n], double (*Mp)[n][n])
{
#define Minv (*Minvp)
#define M (*Mp)
#define J (*Jp)
double J[n][2 * n] = alloca(sizeof(double[n][2 * n]));
size_t i;
for (i = 0; i < n; i++) {
memcpy(J[i], M[i], n * sizeof(double));
memset(J[i] + n, 0, n * sizeof(double));
J[i][n + i] = 1;
}
if (eliminate(J, n, 2 * n))
return -1;
for (i = 0; i < n; i++)
memcpy(Minv[i], J[i] + n, n * sizeof(double));
return 0;
#undef J
#undef M
#undef Minv
}
static double transfer_function_l_star(double t)
{
double sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t > 216. / 24389. ? 1.16 * cbrt(t) - 0.16 : t * 24389. / 2700.;
return t * sign;
}
static double invtransfer_function_l_star(double t)
{
double sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t > 0.08 ? (((1000000. * t + 480000.) * t + 76800.) * t + 4096.) / 1560896.0 : t * 2700. / 24389.;
return t * sign;
}
static void get_transfer_function(libcolour_colour_t* cs)
{
if (cs->model == LIBCOLOUR_RGB) {
switch (cs->rgb.colour_space) {
case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB_V2:
cs->rgb.to_encoded_red = cs->rgb.to_encoded_green = cs->rgb.to_encoded_blue = transfer_function_l_star;
cs->rgb.to_decoded_red = cs->rgb.to_decoded_green = cs->rgb.to_decoded_blue = invtransfer_function_l_star;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_EOTF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OOTF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OETF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_EOTF_HLG:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OOTF_HLG:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OETF_HLG:
/* TODO http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.2100-0-201607-I!!PDF-E.pdf */
break;
default:
break;
}
}
}
int libcolour_get_rgb_colour_space(libcolour_rgb_t* cs, libcolour_rgb_colour_space_t space)
{
#define XYY(XVALUE, YVALUE) (libcolour_ciexyy_t){ .model = LIBCOLOUR_CIEXYY, .x = XVALUE, .y = YVALUE, .Y = 1}
switch (space) {
case LIBCOLOUR_RGB_COLOUR_SPACE_CUSTOM_FROM_MEASUREMENTS:
if (get_matrices(cs))
return -1;
if (cs->encoding_type == LIBCOLOUR_ENCODING_TYPE_REGULAR)
cs->transitioninv = cs->transition * cs->slope;
return 0;
case LIBCOLOUR_RGB_COLOUR_SPACE_CUSTOM_FROM_MATRIX:
if (invert(cs->Minv, cs->M, 3) || get_primaries(cs))
return -1;
if (cs->encoding_type == LIBCOLOUR_ENCODING_TYPE_REGULAR)
cs->transitioninv = cs->transition * cs->slope;
return 0;
case LIBCOLOUR_RGB_COLOUR_SPACE_CUSTOM_FROM_INV_MATRIX:
if (invert(cs->M, cs->Minv, 3) || get_primaries(cs))
return -1;
if (cs->encoding_type == LIBCOLOUR_ENCODING_TYPE_REGULAR)
cs->transitioninv = cs->transition * cs->slope;
return 0;
case LIBCOLOUR_RGB_COLOUR_SPACE_SRGB:
cs->red = XYY(0.6400, 0.3300);
cs->green = XYY(0.3000, 0.6000);
cs->blue = XYY(0.1500, 0.0600);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->offset = 0.055;
cs->gamma = 2.4;
cs->slope = 12.92;
cs->transition = 0.0031306684425217108;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ADOBE_RGB:
cs->red = XYY(0.6400, 0.3300);
cs->green = XYY(0.2100, 0.7100);
cs->blue = XYY(0.1500, 0.0600);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_APPLE_RGB:
cs->red = XYY(0.6250, 0.3400);
cs->green = XYY(0.2800, 0.5950);
cs->blue = XYY(0.1550, 0.0700);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 1.8;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_BEST_RGB:
cs->red = XYY(0.7347, 0.2653);
cs->green = XYY(0.2150, 0.7750);
cs->blue = XYY(0.1300, 0.0350);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_BETA_RGB:
cs->red = XYY(0.6888, 0.3112);
cs->green = XYY(0.1986, 0.7551);
cs->blue = XYY(0.1265, 0.0352);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_BRUCE_RGB:
cs->red = XYY(0.6400, 0.3300);
cs->green = XYY(0.2800, 0.6500);
cs->blue = XYY(0.1500, 0.0600);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_CIE_RGB:
cs->red = XYY(0.7350, 0.2650);
cs->green = XYY(0.2740, 0.7170);
cs->blue = XYY(0.1670, 0.0090);
cs->white = LIBCOLOUR_ILLUMINANT_E;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_COLORMATCH_RGB:
cs->red = XYY(0.6300, 0.3400);
cs->green = XYY(0.2950, 0.6050);
cs->blue = XYY(0.1500, 0.0750);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 1.8;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_DCI_P3_D65:
cs->red = XYY(0.6380, 0.3200);
cs->green = XYY(0.2650, 0.6900);
cs->blue = XYY(0.1500, 0.0600);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.6;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_DCI_P3_THEATER:
cs->red = XYY(0.6380, 0.3200);
cs->green = XYY(0.2650, 0.6900);
cs->blue = XYY(0.1500, 0.0600);
cs->white = XYY(0.314, 0.351);
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.6;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_DON_RGB_4:
cs->red = XYY(0.6960, 0.3000);
cs->green = XYY(0.2150, 0.7650);
cs->blue = XYY(0.1300, 0.0350);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB:
cs->red = XYY(0.6700, 0.3300);
cs->green = XYY(0.2100, 0.7100);
cs->blue = XYY(0.1400, 0.0800);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 1.8;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB_V2:
cs->red = XYY(0.6700, 0.3300);
cs->green = XYY(0.2100, 0.7100);
cs->blue = XYY(0.1400, 0.0800);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_CUSTOM;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_EKTA_SPACE_PS5:
cs->red = XYY(0.6950, 0.3050);
cs->green = XYY(0.2600, 0.7000);
cs->blue = XYY(0.1100, 0.0050);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.2;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_601_625_LINE:
cs->red = XYY(0.6400, 0.3300);
cs->green = XYY(0.2900, 0.6000);
cs->blue = XYY(0.1500, 0.0060);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_601_525_LINE:
cs->red = XYY(0.6300, 0.3400);
cs->green = XYY(0.3100, 0.5950);
cs->blue = XYY(0.1550, 0.0700);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_709:
cs->red = XYY(0.6300, 0.3300);
cs->green = XYY(0.3000, 0.6000);
cs->blue = XYY(0.1500, 0.0600);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2020:
cs->red = XYY(0.7080, 0.2920);
cs->green = XYY(0.1700, 0.7970);
cs->blue = XYY(0.1310, 0.0460);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_EOTF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OOTF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OETF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_EOTF_HLG:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OOTF_HLG:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OETF_HLG:
cs->red = XYY(0.7080, 0.2920);
cs->green = XYY(0.1700, 0.7970);
cs->blue = XYY(0.1310, 0.0460);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_CUSTOM;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_LIGHTROOM_RGB:
cs->red = XYY(0.7347, 0.2653);
cs->green = XYY(0.1596, 0.8404);
cs->blue = XYY(0.0366, 0.0001);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_LINEAR;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_NTSC_RGB:
cs->red = XYY(0.6700, 0.3300);
cs->green = XYY(0.2100, 0.7100);
cs->blue = XYY(0.1400, 0.0800);
cs->white = LIBCOLOUR_ILLUMINANT_C;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_PAL_SECAM_RGB:
cs->red = XYY(0.6400, 0.3300);
cs->green = XYY(0.2900, 0.6000);
cs->blue = XYY(0.1500, 0.0600);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_PROPHOTO_RGB:
cs->red = XYY(0.7347, 0.2653);
cs->green = XYY(0.1596, 0.8404);
cs->blue = XYY(0.0366, 0.0001);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 1.8;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_SGI_RGB:
cs->red = XYY(0.6250, 0.3400);
cs->green = XYY(0.2800, 0.5950);
cs->blue = XYY(0.1550, 0.0700);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 1.47;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_SMPTE_240M_RGB:
cs->red = XYY(0.6300, 0.3400);
cs->green = XYY(0.3100, 0.5950);
cs->blue = XYY(0.1550, 0.0700);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.1115721957735072;
cs->slope = 4.0;
cs->transition = 0.022821585552393633;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_SMPTE_C_RGB:
cs->red = XYY(0.6300, 0.3400);
cs->green = XYY(0.3100, 0.5950);
cs->blue = XYY(0.1550, 0.0700);
cs->white = LIBCOLOUR_ILLUMINANT_D65;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_REGULAR;
cs->gamma = 1 / 0.45;
cs->offset = 0.09929682680944;
cs->slope = 4.5;
cs->transition = 0.018053968510807;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_WIDE_GAMUT_RGB:
cs->red = XYY(0.7350, 0.2650);
cs->green = XYY(0.1150, 0.8260);
cs->blue = XYY(0.1570, 0.0180);
cs->white = LIBCOLOUR_ILLUMINANT_D50;
cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
cs->gamma = 2.19921875;
break;
default:
errno = EINVAL;
return -1;
}
if (cs->encoding_type == LIBCOLOUR_ENCODING_TYPE_REGULAR)
cs->transitioninv = cs->transition * cs->slope;
cs->colour_space = space;
cs->white_r = cs->white_g = cs->white_b = 1;
if (get_matrices(cs) || libcolour_proper((libcolour_colour_t*)cs))
return -1;
get_transfer_function((libcolour_colour_t*)cs);
return 0;
#undef XYY
}
size_t libcolour_marshal(const libcolour_colour_t* colour, void* buf)
{
if (buf)
*(int*)buf = MARSHAL_VERSION;
switch (colour->model) {
#define X(C, T)\
case C:\
if (buf)\
memcpy((char*)buf + sizeof(int), colour, sizeof(T));\
return sizeof(int) + sizeof(T);
LIBCOLOUR_LIST_MODELS
#undef X
default:
errno = EINVAL;
return 0;
}
}
size_t libcolour_unmarshal(libcolour_colour_t* colour, const void* buf)
{
enum libcolour_model model;
size_t r;
int ver;
ver = *(int*)buf;
if (ver != MARSHAL_VERSION) {
errno = EINVAL;
return 0;
}
model = *(enum libcolour_model*)((char*)buf + sizeof(int));
switch (model) {
#define X(C, T)\
case C:\
if (colour)\
memcpy(colour, (char*)buf + sizeof(int), sizeof(T));\
r = sizeof(int) + sizeof(T);\
break;
LIBCOLOUR_LIST_MODELS
#undef X
default:
errno = EINVAL;
return 0;
}
if (colour) {
if (colour->model == LIBCOLOUR_RGB) {
colour->rgb.to_encoded_red = colour->rgb.to_encoded_green = colour->rgb.to_encoded_blue = NULL;
colour->rgb.to_decoded_red = colour->rgb.to_decoded_green = colour->rgb.to_decoded_blue = NULL;
}
get_transfer_function(colour);
}
return r;
}
