/* See LICENSE file for copyright and license details. */
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic ignored "-Wfloat-equal"
#elif defined(__clang__)
# pragma clang diagnostic ignored "-Wcomma"
# pragma clang diagnostic ignored "-Wfloat-equal"
# pragma clang diagnostic ignored "-Wvla"
# pragma clang diagnostic ignored "-Wtautological-compare"
# pragma clang diagnostic ignored "-Wcovered-switch-default"
# pragma clang diagnostic ignored "-Wfloat-conversion"
# pragma clang diagnostic ignored "-Wconversion"
# pragma clang diagnostic ignored "-Wdouble-promotion"
# pragma clang diagnostic ignored "-Wswitch-enum"
# pragma clang diagnostic ignored "-Wcast-align"
#endif
#define MARSHAL_VERSION 1
#define SLOPE transfer.regular.slope
#define TRANSITIONINV transfer.regular.transitioninv
#define TRANSITION transfer.regular.transition
#define GAMMA transfer.regular.gamma
#define OFFSET transfer.regular.offset
#define TO_ENCODED_RED transfer.custom.to_encoded_red
#define TO_DECODED_RED transfer.custom.to_decoded_red
#define TO_ENCODED_GREEN transfer.custom.to_encoded_green
#define TO_DECODED_GREEN transfer.custom.to_decoded_green
#define TO_ENCODED_BLUE transfer.custom.to_encoded_blue
#define TO_DECODED_BLUE transfer.custom.to_decoded_blue
TYPE
libcolour_srgb_encode(TYPE t)
{
TYPE sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t <= D(0.0031306684425217108) ? D(12.92) * t :
D(1.055) * xpow(t, 1 / D(2.4)) - D(0.055);
return t * sign;
}
TYPE
libcolour_srgb_decode(TYPE t)
{
TYPE sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t <= D(0.0031306684425217108) * D(12.92) ? t / D(12.92) :
xpow((t + D(0.055)) / D(1.055), D(2.4));
return t * sign;
}
int
libcolour_delta_e(const libcolour_colour_t *a, const libcolour_colour_t *b, TYPE *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 = xsqrt(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, TYPE (*Mp)[n][m])
{
#define M (*Mp)
size_t r1, r2, c;
TYPE d;
TYPE *R1;
TYPE *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;
TYPE 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;
if (!colour->cielchuv.one_revolution)
colour->cielchuv.one_revolution = D(360.);
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;
TYPE Sr, Sg, Sb;
TYPE 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(TYPE)), M[0][3] = Sr;
memcpy(M[1], M[1] + 3, 3 * sizeof(TYPE)), M[1][3] = Sg;
memcpy(M[2], M[2] + 3, 3 * sizeof(TYPE)), 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;
TYPE M[3][6];
TYPE 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(TYPE)), M[0][3] = 1, M[0][4] = 0, M[0][5] = 0;
memcpy(M[1], cs->M[1], 3 * sizeof(TYPE)), M[1][3] = 0, M[1][4] = 1, M[1][5] = 0;
memcpy(M[2], cs->M[2], 3 * sizeof(TYPE)), 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(TYPE));
memcpy(cs->Minv[1], M[1] + 3, 3 * sizeof(TYPE));
memcpy(cs->Minv[2], M[2] + 3, 3 * sizeof(TYPE));
return 0;
}
#define invert(Minv, M, n) invert_(n, &(Minv), &(M))
static int
invert_(size_t n, TYPE (*Minvp)[n][n], TYPE (*Mp)[n][n])
{
#define Minv (*Minvp)
#define M (*Mp)
#define J (*Jp)
TYPE J[n][2 * n] = alloca(sizeof(TYPE[n][2 * n]));
size_t i;
for (i = 0; i < n; i++) {
memcpy(J[i], M[i], n * sizeof(TYPE));
memset(J[i] + n, 0, n * sizeof(TYPE));
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(TYPE));
return 0;
#undef J
#undef M
#undef Minv
}
static TYPE
transfer_function_l_star(TYPE t)
{
TYPE sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t > D(216.) / D(24389.) ? D(1.16) * xcbrt(t) - D(0.16) : t * D(24389.) / D(2700.);
return t * sign;
}
static TYPE
invtransfer_function_l_star(TYPE t)
{
TYPE sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t > D(0.08) ? (((D(1000000.) * t + D(480000.)) * t +
D(76800.)) * t + D(4096.)) / D(1560896.) :
t * D(2700.) / D(24389.);
return t * sign;
}
static TYPE
transfer_function_oetf_hlg(TYPE t)
{
TYPE sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = 12 * t <= 1 ? xsqrt(3 * t) :
D(0.17883277) * xlog(t - D(0.02372241)) + D(1.004293468902569985701234145381);
return t * sign;
}
static TYPE
invtransfer_function_oetf_hlg(TYPE t)
{
TYPE sign = 1;
if (t < 0) {
t = -t;
sign = -1;
}
t = t <= D(0.5) ? t * t / 3 :
xexp(t - D(1.004293468902569985701234145381)) / D(0.17883277) + D(0.02372241);
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:
/* TODO http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.2100-0-201607-I!!PDF-E.pdf */
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OETF_HLG:
cs->rgb.TO_ENCODED_RED = cs->rgb.TO_ENCODED_GREEN = cs->rgb.TO_ENCODED_BLUE = transfer_function_oetf_hlg;
cs->rgb.TO_DECODED_RED = cs->rgb.TO_DECODED_GREEN = cs->rgb.TO_DECODED_BLUE = invtransfer_function_oetf_hlg;
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 = D(XVALUE), .y = D(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 = D(0.055);
cs->GAMMA = D(2.4);
cs->SLOPE = D(12.92);
cs->TRANSITION = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 = D(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 = D(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 / D(0.45);
cs->OFFSET = D(0.1115721957735072);
cs->SLOPE = D(4.0);
cs->TRANSITION = D(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 / D(0.45);
cs->OFFSET = D(0.09929682680944);
cs->SLOPE = D(4.5);
cs->TRANSITION = D(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 = D(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, N)\
case C:\
if (buf)\
memcpy((char *)buf + sizeof(int), colour, sizeof(T));\
return sizeof(int) + sizeof(T);
LIST_MODELS(X)
#undef X
default:
errno = EINVAL;
return 0;
}
}
static size_t
libcolour_unmarshal_version_0_rgb(void *colour, const void *buf)
{
libcolour_rgb_t *c = colour;
struct old_rgb {
enum libcolour_model model;
TYPE R;
TYPE G;
TYPE B;
int with_transfer;
enum libcolour_encoding_type encoding_type;
TYPE gamma;
TYPE offset;
TYPE slope;
TYPE transition;
TYPE transitioninv;
TYPE (*to_encoded_red)(TYPE);
TYPE (*to_decoded_red)(TYPE);
TYPE (*to_encoded_green)(TYPE);
TYPE (*to_decoded_green)(TYPE);
TYPE (*to_encoded_blue)(TYPE);
TYPE (*to_decoded_blue)(TYPE);
libcolour_ciexyy_t red;
libcolour_ciexyy_t green;
libcolour_ciexyy_t blue;
libcolour_ciexyy_t white;
TYPE white_r;
TYPE white_g;
TYPE white_b;
TYPE M[3][3];
TYPE Minv[3][3];
enum libcolour_rgb_colour_space colour_space;
} old_c;
if (c) {
memcpy(&old_c, (const char *)buf + sizeof(int), sizeof(old_c));
memset(&c->transfer, 0, sizeof(c->transfer));
c->model = old_c.model;
c->R = old_c.R;
c->G = old_c.G;
c->B = old_c.B;
c->with_transfer = old_c.with_transfer;
c->encoding_type = old_c.encoding_type;
if (c->encoding_type == LIBCOLOUR_ENCODING_TYPE_SIMPLE) {
c->transfer.simple.gamma = old_c.gamma;
} else if (c->encoding_type == LIBCOLOUR_ENCODING_TYPE_REGULAR) {
c->transfer.regular.gamma = old_c.gamma;
c->transfer.regular.offset = old_c.offset;
c->transfer.regular.slope = old_c.slope;
c->transfer.regular.transition = old_c.transition;
c->transfer.regular.transitioninv = old_c.transitioninv;
} else if (c->encoding_type == LIBCOLOUR_ENCODING_TYPE_CUSTOM) {
c->transfer.custom.to_encoded_red = old_c.to_encoded_red;
c->transfer.custom.to_decoded_red = old_c.to_decoded_red;
c->transfer.custom.to_encoded_green = old_c.to_encoded_green;
c->transfer.custom.to_decoded_green = old_c.to_decoded_green;
c->transfer.custom.to_encoded_blue = old_c.to_encoded_blue;
c->transfer.custom.to_decoded_blue = old_c.to_decoded_blue;
}
c->red = old_c.red;
c->green = old_c.green;
c->blue = old_c.blue;
c->white = old_c.white;
c->white_r = old_c.white_r;
c->white_g = old_c.white_g;
c->white_b = old_c.white_b;
c->M[0][0] = old_c.M[0][0];
c->M[0][1] = old_c.M[0][1];
c->M[0][2] = old_c.M[0][2];
c->M[1][0] = old_c.M[1][0];
c->M[1][1] = old_c.M[1][1];
c->M[1][2] = old_c.M[1][2];
c->M[2][0] = old_c.M[2][0];
c->M[2][1] = old_c.M[2][1];
c->M[2][2] = old_c.M[2][2];
c->Minv[0][0] = old_c.Minv[0][0];
c->Minv[0][1] = old_c.Minv[0][1];
c->Minv[0][2] = old_c.Minv[0][2];
c->Minv[1][0] = old_c.Minv[1][0];
c->Minv[1][1] = old_c.Minv[1][1];
c->Minv[1][2] = old_c.Minv[1][2];
c->Minv[2][0] = old_c.Minv[2][0];
c->Minv[2][1] = old_c.Minv[2][1];
c->Minv[2][2] = old_c.Minv[2][2];
c->colour_space = old_c.colour_space;
}
return sizeof(int) + sizeof(old_c);
}
size_t
libcolour_unmarshal(libcolour_colour_t *colour, const void *buf)
{
enum libcolour_model model;
size_t r;
int ver;
ver = *(const int *)buf;
if (ver < 0 || ver > MARSHAL_VERSION) {
errno = EINVAL;
return 0;
}
model = *(const enum libcolour_model *)((const char *)buf + sizeof(int));
switch (model) {
#define X(C, T, N)\
case C:\
if (C == LIBCOLOUR_RGB && ver == 0) {\
r = libcolour_unmarshal_version_0_rgb(colour, buf);\
break;\
}\
if (colour)\
memcpy(colour, (const char *)buf + sizeof(int), sizeof(T));\
r = sizeof(int) + sizeof(T);\
break;
LIST_MODELS(X)
#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;
}
