/* 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 PI D(3.14159265358979323846)
#define PI2 (2 * D(3.14159265358979323846))
#define WASDIV0(X) (xisinf(X) || xisnan(X))
#define REGULAR(S, T) ((T) <= (S)->TRANSITION ? (S)->SLOPE * (T) : (1 + (S)->OFFSET) * xpow((T), 1 / (S)->GAMMA) - (S)->OFFSET)
#define INVREGULAR(S, T) ((T) <= (S)->TRANSITIONINV ? (T) / (S)->SLOPE : xpow(((T) + (S)->OFFSET) / (1 + (S)->OFFSET), (S)->GAMMA))
#define TRANSFORM(X, Y, Z, A, B, C, R1C1, R1C2, R1C3, R2C1, R2C2, R2C3, R3C1, R3C2, R3C3)\
do {\
TYPE a__ = (A), b__ = (B), c__ = (C);\
(X) = D(R1C1) * a__ + D(R1C2) * b__ + D(R1C3) * c__;\
(Y) = D(R2C1) * a__ + D(R2C2) * b__ + D(R2C3) * c__;\
(Z) = D(R3C1) * a__ + D(R3C2) * b__ + D(R3C3) * c__;\
} while (0)
#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
static void to_rgb(const libcolour_colour_t *restrict from, libcolour_rgb_t *restrict to);
static void to_srgb(const libcolour_colour_t *restrict from, libcolour_srgb_t *restrict to);
static void to_ciexyy(const libcolour_colour_t *restrict from, libcolour_ciexyy_t *restrict to);
static void to_ciexyz(const libcolour_colour_t *restrict from, libcolour_ciexyz_t *restrict to);
static void to_cielab(const libcolour_colour_t *restrict from, libcolour_cielab_t *restrict to);
static void to_cieluv(const libcolour_colour_t *restrict from, libcolour_cieluv_t *restrict to);
static void to_cielchuv(const libcolour_colour_t *restrict from, libcolour_cielchuv_t *restrict to);
static void to_yiq(const libcolour_colour_t *restrict from, libcolour_yiq_t *restrict to);
static void to_ydbdr(const libcolour_colour_t *restrict from, libcolour_ydbdr_t *restrict to);
static void to_yuv(const libcolour_colour_t *restrict from, libcolour_yuv_t *restrict to);
static void to_ypbpr(const libcolour_colour_t *restrict from, libcolour_ypbpr_t *restrict to);
static void to_ycgco(const libcolour_colour_t *restrict from, libcolour_ycgco_t *restrict to);
static void to_cie1960ucs(const libcolour_colour_t *restrict from, libcolour_cie1960ucs_t *restrict to);
static void to_cieuvw(const libcolour_colour_t *restrict from, libcolour_cieuvw_t *restrict to);
static void
ciexyz_to_rgb(const libcolour_ciexyz_t *restrict from, libcolour_rgb_t *restrict to)
{
TYPE X = from->X, Y = from->Y, Z = from->Z;
to->R = to->Minv[0][0] * X + to->Minv[0][1] * Y + to->Minv[0][2] * Z;
to->G = to->Minv[1][0] * X + to->Minv[1][1] * Y + to->Minv[1][2] * Z;
to->B = to->Minv[2][0] * X + to->Minv[2][1] * Y + to->Minv[2][2] * Z;
}
static void
rgb_encode(libcolour_rgb_t *restrict colour, const libcolour_rgb_t *restrict space)
{
TYPE r_sign = 1, g_sign = 1, b_sign = 1;
switch (space->encoding_type) {
case LIBCOLOUR_ENCODING_TYPE_LINEAR:
break;
case LIBCOLOUR_ENCODING_TYPE_SIMPLE:
case LIBCOLOUR_ENCODING_TYPE_REGULAR:
if (colour->R < 0) r_sign = -1, colour->R = -colour->R;
if (colour->G < 0) g_sign = -1, colour->G = -colour->G;
if (colour->B < 0) b_sign = -1, colour->B = -colour->B;
if (space->encoding_type == LIBCOLOUR_ENCODING_TYPE_SIMPLE) {
colour->R = xpow(colour->R, 1 / space->GAMMA);
colour->G = xpow(colour->G, 1 / space->GAMMA);
colour->B = xpow(colour->B, 1 / space->GAMMA);
} else {
colour->R = REGULAR(space, colour->R);
colour->G = REGULAR(space, colour->G);
colour->B = REGULAR(space, colour->B);
}
colour->R *= r_sign;
colour->G *= g_sign;
colour->B *= b_sign;
break;
case LIBCOLOUR_ENCODING_TYPE_CUSTOM:
colour->R = (space->TO_ENCODED_RED)(colour->R);
colour->G = (space->TO_ENCODED_GREEN)(colour->G);
colour->B = (space->TO_ENCODED_BLUE)(colour->B);
break;
default:
fprintf(stderr, "libcolour: invalid encoding type\n");
abort();
}
}
static void
rgb_decode(libcolour_rgb_t *restrict colour, const libcolour_rgb_t *restrict space)
{
TYPE r_sign = 1, g_sign = 1, b_sign = 1;
switch (space->encoding_type) {
case LIBCOLOUR_ENCODING_TYPE_LINEAR:
break;
case LIBCOLOUR_ENCODING_TYPE_SIMPLE:
case LIBCOLOUR_ENCODING_TYPE_REGULAR:
if (colour->R < 0) r_sign = -1, colour->R = -colour->R;
if (colour->G < 0) g_sign = -1, colour->G = -colour->G;
if (colour->B < 0) b_sign = -1, colour->B = -colour->B;
if (space->encoding_type == LIBCOLOUR_ENCODING_TYPE_SIMPLE) {
colour->R = xpow(colour->R, space->GAMMA);
colour->G = xpow(colour->G, space->GAMMA);
colour->B = xpow(colour->B, space->GAMMA);
} else {
colour->R = INVREGULAR(space, colour->R);
colour->G = INVREGULAR(space, colour->G);
colour->B = INVREGULAR(space, colour->B);
}
colour->R *= r_sign;
colour->G *= g_sign;
colour->B *= b_sign;
break;
case LIBCOLOUR_ENCODING_TYPE_CUSTOM:
colour->R = (space->TO_DECODED_RED)(colour->R);
colour->G = (space->TO_DECODED_GREEN)(colour->G);
colour->B = (space->TO_DECODED_BLUE)(colour->B);
break;
default:
fprintf(stderr, "libcolour: invalid encoding type\n");
abort();
}
}
static int
rgb_same_transfer(const libcolour_rgb_t *restrict a, const libcolour_rgb_t *restrict b)
{
if (a->encoding_type != b->encoding_type)
return 0;
switch (a->encoding_type) {
case LIBCOLOUR_ENCODING_TYPE_SIMPLE:
return a->GAMMA == b->GAMMA;
case LIBCOLOUR_ENCODING_TYPE_REGULAR:
return a->GAMMA == b->GAMMA &&
a->OFFSET == b->OFFSET &&
a->SLOPE == b->SLOPE &&
a->TRANSITION == b->TRANSITION;
case LIBCOLOUR_ENCODING_TYPE_CUSTOM:
return a->TO_ENCODED_RED == b->TO_ENCODED_RED &&
a->TO_ENCODED_GREEN == b->TO_ENCODED_GREEN &&
a->TO_ENCODED_BLUE == b->TO_ENCODED_BLUE &&
a->TO_DECODED_RED == b->TO_DECODED_RED &&
a->TO_DECODED_GREEN == b->TO_DECODED_GREEN &&
a->TO_DECODED_BLUE == b->TO_DECODED_BLUE;
default:
return 1;
}
}
static void
to_rgb(const libcolour_colour_t *restrict from, libcolour_rgb_t *restrict to)
{
int have_transfer = 0, with_transfer = to->with_transfer;
libcolour_ciexyz_t tmp;
switch (from->model) {
case LIBCOLOUR_CIEXYZ:
ciexyz_to_rgb(&from->ciexyz, to);
break;
case LIBCOLOUR_RGB:
if (!memcmp(from->rgb.M, to->M, sizeof(TYPE[3][3]))) {
have_transfer = from->rgb.with_transfer;
to->R = from->rgb.R;
to->G = from->rgb.G;
to->B = from->rgb.B;
if (have_transfer && with_transfer && !rgb_same_transfer(&from->rgb, to))
rgb_decode(to, &from->rgb), have_transfer = 0;
break;
}
/* fall through */
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp);
ciexyz_to_rgb(&tmp, to);
break;
}
if (have_transfer != with_transfer) {
if (with_transfer)
rgb_encode(to, to);
else
rgb_decode(to, &from->rgb);
}
}
static void
ciexyz_to_srgb(const libcolour_ciexyz_t *restrict from, libcolour_srgb_t *restrict to)
{
TRANSFORM(to->R, to->G, to->B, from->X, from->Y, from->Z,
3.240446254647737500675930277794, -1.537134761820080575134284117667, -0.498530193022728718155178739835,
-0.969266606244679751469561779231, 1.876011959788370209167851498933, 0.041556042214430065351304932619,
0.055643503564352832235773149705, -0.204026179735960239147729566866, 1.057226567722703292062647051353);
}
static inline TYPE
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;
}
static inline TYPE
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;
}
static void
srgb_to_srgb(const libcolour_srgb_t *restrict from, libcolour_srgb_t *restrict to)
{
if (from->with_transfer == to->with_transfer) {
*to = *from;
} else if (to->with_transfer) {
to->R = srgb_encode(from->R);
to->G = srgb_encode(from->G);
to->B = srgb_encode(from->B);
} else {
to->R = srgb_decode(from->R);
to->G = srgb_decode(from->G);
to->B = srgb_decode(from->B);
}
}
static void
yiq_to_srgb(const libcolour_yiq_t *restrict from, libcolour_srgb_t *restrict to)
{
TRANSFORM(to->R, to->G, to->B, from->Y, from->I, from->Q,
1, 0.95629483232089407263032398986979387700557708740234, 0.62102512544472865396727456754888407886028289794922,
1, -0.27212147408397735492968649850809015333652496337891, -0.64738095351761570928061928498209454119205474853516,
1, -1.10698990856712820018969978264067322015762329101562, 1.70461497549882934343656870623817667365074157714844);
/* ⎛1 1000 cos 33° / 877 1000 sin 33° / 877 ⎞
⎜1 9500 sin 33° / 24067 - 299000 * cos 33° / 514799 -9500 cos 33° / 24067 - 299000 * sin 33° / 514799⎟
⎝1 -250 sin 33° / 123 250 cos 33° / 123 ⎠
*/
}
static void
ydbdr_to_srgb(const libcolour_ydbdr_t *restrict from, libcolour_srgb_t *restrict to)
{
TRANSFORM(to->R, to->G, to->B, from->Y, from->Db, from->Dr,
1, 0.000092303716148, -0.525912630661865,
1, -0.129132898890509, 0.267899328207599,
1, 0.664679059978955, -0.000079202543533);
}
static void
ypbpr_to_srgb(const libcolour_ypbpr_t *restrict from, libcolour_srgb_t *restrict to)
{
TYPE Y = from->Y, Pb = from->Pb, Pr = from->Pr;
to->R = Pr + Y;
to->B = Pb + Y;
to->G = (Y - to->R * D(0.2126) - to->B * D(0.0722)) / D(0.7152);
}
static void
yuv_to_srgb(const libcolour_yuv_t *restrict from, libcolour_srgb_t *restrict to)
{
TRANSFORM(to->R, to->G, to->B, from->Y, from->U, from->V,
1, 0.00028328010485821202317155420580263580632163211703, 1.14070449590558520291949662350816652178764343261719,
1, -0.39630886669497211727275498560629785060882568359375, -0.58107364288228224857846271333983168005943298339844,
1, 2.03990003507541306504435851820744574069976806640625, 0.00017179031692307700847528739718228507626918144524);
}
static void
ycgco_to_srgb(const libcolour_ycgco_t *restrict from, libcolour_srgb_t *restrict to)
{
TYPE Y = from->Y, Cg = from->Cg, Co = from->Co;
to->R = Y - Cg + Co;
to->G = Y + Cg;
to->B = Y - Cg - Co;
}
static void
other_to_srgb(const libcolour_colour_t *restrict from, libcolour_srgb_t *restrict to)
{
libcolour_ciexyz_t tmp;
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp);
ciexyz_to_srgb(&tmp, to);
}
static void
to_srgb(const libcolour_colour_t *restrict from, libcolour_srgb_t *restrict to)
{
libcolour_srgb_t tmp;
switch (from->model) {
case LIBCOLOUR_CIEXYZ:
ciexyz_to_srgb(&from->ciexyz, to);
break;
case LIBCOLOUR_SRGB:
srgb_to_srgb(&from->srgb, to);
return;
case LIBCOLOUR_YIQ:
yiq_to_srgb(&from->yiq, to);
break;
case LIBCOLOUR_YDBDR:
ydbdr_to_srgb(&from->ydbdr, to);
break;
case LIBCOLOUR_YPBPR:
ypbpr_to_srgb(&from->ypbpr, to);
break;
case LIBCOLOUR_YUV:
yuv_to_srgb(&from->yuv, to);
break;
case LIBCOLOUR_YCGCO:
ycgco_to_srgb(&from->ycgco, to);
break;
default:
other_to_srgb(from, to);
break;
}
if (to->with_transfer) {
tmp = *to;
tmp.with_transfer = 0;
srgb_to_srgb(&tmp, to);
}
}
static void
ciexyz_to_ciexyy(const libcolour_ciexyz_t *restrict from, libcolour_ciexyy_t *restrict to)
{
TYPE X = from->X, Y = from->Y, Z = from->Z;
TYPE s = X + Y + Z;
to->x = X / s;
to->y = Y / s;
to->Y = Y;
if (WASDIV0(to->x) || WASDIV0(to->y))
to->x = to->y = 0;
}
static void
other_to_ciexyy(const libcolour_colour_t *restrict from, libcolour_ciexyy_t *restrict to)
{
libcolour_ciexyz_t tmp;
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp);
ciexyz_to_ciexyy(&tmp, to);
}
static void
srgb_to_ciexyy(const libcolour_srgb_t *restrict from, libcolour_ciexyy_t *restrict to)
{
libcolour_srgb_t tmp;
tmp.model = LIBCOLOUR_SRGB;
if (from->with_transfer) {
tmp.with_transfer = 0;
to_srgb((const libcolour_colour_t*)from, &tmp);
} else {
tmp = *from;
}
if (tmp.R == 0 && tmp.G == 0 && tmp.B == 0) {
to->x = D(0.31272660439158);
to->y = D(0.32902315240275);
to->Y = 0;
} else {
other_to_ciexyy((const libcolour_colour_t*)&tmp, to);
}
}
static void
to_ciexyy(const libcolour_colour_t *restrict from, libcolour_ciexyy_t *restrict to)
{
switch (from->model) {
case LIBCOLOUR_CIEXYY:
*to = from->ciexyy;
return;
case LIBCOLOUR_CIEXYZ:
ciexyz_to_ciexyy(&from->ciexyz, to);
return;
case LIBCOLOUR_SRGB:
srgb_to_ciexyy(&from->srgb, to);
return;
default:
other_to_ciexyy(from, to);
return;
}
}
static void
rgb_to_ciexyz(const libcolour_rgb_t *restrict from, libcolour_ciexyz_t *restrict to)
{
libcolour_rgb_t tmp;
TYPE R, G, B;
if (from->with_transfer) {
tmp = *from;
tmp.with_transfer = 0;
to_rgb((const libcolour_colour_t *)from, &tmp);
R = tmp.R, G = tmp.G, B = tmp.B;
} else {
R = from->R, G = from->G, B = from->B;
}
to->X = from->M[0][0] * R + from->M[0][1] * G + from->M[0][2] * B;
to->Y = from->M[1][0] * R + from->M[1][1] * G + from->M[1][2] * B;
to->Z = from->M[2][0] * R + from->M[2][1] * G + from->M[2][2] * B;
}
static void srgb_to_ciexyz(const libcolour_srgb_t *restrict from, libcolour_ciexyz_t *restrict to)
{
libcolour_srgb_t tmp;
TYPE R, G, B;
if (from->with_transfer) {
tmp.model = LIBCOLOUR_SRGB;
tmp.with_transfer = 0;
to_srgb((const libcolour_colour_t*)from, &tmp);
R = tmp.R, G = tmp.G, B = tmp.B;
} else {
R = from->R, G = from->G, B = from->B;
}
TRANSFORM(to->X, to->Y, to->Z, R, G, B,
0.412457445582367576708548995157, 0.357575865245515878143578447634, 0.180437247826399665973085006954,
0.212673370378408277403536885686, 0.715151730491031756287156895269, 0.072174899130559869164791564344,
0.019333942761673460208893260415, 0.119191955081838593666354597644, 0.950302838552371742508739771438);
}
static void
ciexyy_to_ciexyz(const libcolour_ciexyy_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TYPE x = from->x, y = from->y, Y = from->Y;
TYPE Yy = Y / y;
if (WASDIV0(Yy)) {
to->X = to->Y = to->Z = Y;
} else {
to->X = x * Yy;
to->Y = Y;
to->Z = (1 - x - y) * Yy;
}
}
static inline TYPE
cielab_finv(TYPE t)
{
return (t > D(6.) / D(29.)) ? t * t * t : (t - D(4.) / D(29.)) * 108 / 841;
}
static void
cielab_to_ciexyz(const libcolour_cielab_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TYPE L = from->L, a = from->a, b = from->b;
to->Y = (L + 16) / 116;
to->X = to->Y + a / 500;
to->Z = to->Y - b / 200;
to->X = cielab_finv(to->X) * D(0.95047);
to->Y = cielab_finv(to->Y);
to->Z = cielab_finv(to->Z) * D(1.08883);
}
static void
cieluv_to_ciexyz(const libcolour_cieluv_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TYPE X = from->white.X, Y = from->white.Y, L = from->L, L13 = from->L * 13;
TYPE t = X + 15 * Y + 3 * from->white.Z;
TYPE u = from->u / L13 + 4 * X / t;
TYPE v = from->v / L13 + 9 * Y / t;
if (L <= 8) {
Y *= L * 27 / 24389;
} else {
L = (L + 16) / 116;
Y *= L * L * L;
}
to->X = D(2.25) * Y * u / v;
to->Y = Y;
to->Z = Y * (3 / v - D(0.75) * u / v - 5);
}
static void
cielchuv_to_ciexyz(const libcolour_cielchuv_t *restrict from, libcolour_ciexyz_t *restrict to)
{
libcolour_cieluv_t tmp;
tmp.model = LIBCOLOUR_CIELUV;
tmp.white = from->white;
to_cieluv((const libcolour_colour_t*)from, &tmp);
cieluv_to_ciexyz(&tmp, to);
}
static void
yiq_to_ciexyz(const libcolour_yiq_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TRANSFORM(to->X, to->Y, to->Z, from->Y, from->I, from->Q,
0.95047055865428309306963683411595411598682403564453,
0.09738463974178063198294807989441324025392532348633,
0.33223466706854809515903070860076695680618286132812,
0.99999999999999988897769753748434595763683319091797,
-0.07112658301916767455974621725545148365199565887451,
-0.20786968876398304040264974901219829916954040527344,
1.08882873639588373393394249433185905218124389648438,
-1.06592139332461721679123911599162966012954711914062,
1.55474471255181900808395312196807935833930969238281);
}
static void
ydbdr_to_ciexyz(const libcolour_ydbdr_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TRANSFORM(to->X, to->Y, to->Z, from->Y, from->Db, from->Dr,
0.95047055865428309306963683411595411598682403564453,
0.07379612357298576119646327242662664502859115600586,
-0.12113653724874726136384595065464964136481285095215,
0.99999999999999988897769753748434595763683319091797,
-0.04435684145428285540813106990754022262990474700928,
0.07973534004202506575431641522300196811556816101074,
1.08882873639588373393394249433185905218124389648438,
0.61625657933494271123464613992837257683277130126953,
0.02168821359337728266192257819966471288353204727173);
}
static void
yuv_to_ciexyz(const libcolour_yuv_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TRANSFORM(to->X, to->Y, to->Z, from->Y, from->U, from->V,
0.95047055865428309306963683411595411598682403564453,
0.22648030324549334180161963558930438011884689331055,
0.26274514929253273143316960158699657768011093139648,
0.99999999999999988897769753748434595763683319091797,
-0.13613114642319409930415474718756740912795066833496,
-0.17294595255115238763288232348713790997862815856934,
1.08882873639588373393394249433185905218124389648438,
1.89129144197893928058817891724174842238426208496094,
-0.04704173528403532422714761196402832865715026855469);
}
static void
ypbpr_to_ciexyz(const libcolour_ypbpr_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TRANSFORM(to->X, to->Y, to->Z, from->Y, from->Pb, from->Pr,
0.95047055865428298204733437160030007362365722656250,
0.14433968424876231217979238863335922360420227050781,
0.30616461986760712399302519770571961998939514160156,
0.99999999999999977795539507496869191527366638183594,
-0.00002022802471486617736928792510298080742359161377,
0.00008771894888734421691367515450110659003257751465,
1.08882873639588373393394249433185905218124389648438,
0.93827031735982591165168287261622026562690734863281,
-0.01609699914324668607035206946420657914131879806519);
}
static void
ycgco_to_ciexyz(const libcolour_ycgco_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TRANSFORM(to->X, to->Y, to->Z, from->Y, from->Cg, from->Co,
0.95047055865428309306963683411595411598682403564453,
-0.23531882816325136453805555447615915909409523010254,
0.23202019775596791073546398820326430723071098327637,
0.99999999999999988897769753748434595763683319091797,
0.43030346098206362359661625305307097733020782470703,
0.14049847124784842211653312915586866438388824462891,
1.08882873639588373393394249433185905218124389648438,
-0.85044482623220662986796014592982828617095947265625,
-0.93096889579069830311652822274481877684593200683594);
}
static void
cie1960ucs_to_ciexyz(const libcolour_cie1960ucs_t *restrict from, libcolour_ciexyz_t *restrict to)
{
TYPE u = from->u, v = from->v, Y = from->Y;
to->X = D(1.5) * Y * u / v;
to->Y = Y;
to->Z = (4 * Y - Y * u - 10 * Y * v) / (2 * v);
}
static void
cieuvw_to_ciexyz(const libcolour_cieuvw_t *restrict from, libcolour_ciexyz_t *restrict to)
{
libcolour_cie1960ucs_t tmp;
tmp.model = LIBCOLOUR_CIE1960UCS;
to_cie1960ucs((const libcolour_colour_t *)from, &tmp);
cie1960ucs_to_ciexyz(&tmp, to);
}
static void
other_to_ciexyz(const libcolour_colour_t *restrict from, libcolour_ciexyz_t *restrict to)
{
libcolour_srgb_t tmp;
tmp.model = LIBCOLOUR_SRGB;
tmp.with_transfer = 0;
to_srgb(from, &tmp);
srgb_to_ciexyz(&tmp, to);
}
static void to_ciexyz(const libcolour_colour_t *restrict from, libcolour_ciexyz_t *restrict to)
{
switch (from->model) {
case LIBCOLOUR_RGB:
rgb_to_ciexyz(&from->rgb, to);
break;
case LIBCOLOUR_SRGB:
srgb_to_ciexyz(&from->srgb, to);
break;
case LIBCOLOUR_CIEXYY:
ciexyy_to_ciexyz(&from->ciexyy, to);
break;
case LIBCOLOUR_CIEXYZ:
*to = from->ciexyz;
break;
case LIBCOLOUR_CIELAB:
cielab_to_ciexyz(&from->cielab, to);
break;
case LIBCOLOUR_CIELUV:
cieluv_to_ciexyz(&from->cieluv, to);
break;
case LIBCOLOUR_CIELCHUV:
cielchuv_to_ciexyz(&from->cielchuv, to);
break;
case LIBCOLOUR_YIQ:
yiq_to_ciexyz(&from->yiq, to);
break;
case LIBCOLOUR_YDBDR:
ydbdr_to_ciexyz(&from->ydbdr, to);
break;
case LIBCOLOUR_YUV:
yuv_to_ciexyz(&from->yuv, to);
break;
case LIBCOLOUR_YPBPR:
ypbpr_to_ciexyz(&from->ypbpr, to);
break;
case LIBCOLOUR_YCGCO:
ycgco_to_ciexyz(&from->ycgco, to);
break;
case LIBCOLOUR_CIE1960UCS:
cie1960ucs_to_ciexyz(&from->cie1960ucs, to);
break;
case LIBCOLOUR_CIEUVW:
cieuvw_to_ciexyz(&from->cieuvw, to);
break;
default:
other_to_ciexyz(from, to);
break;
}
}
static inline TYPE
cielab_f(TYPE t)
{
return (t > D(216.) / D(24389.)) ? xcbrt(t) : t * D(841.) / D(108.) + D(4.) / D(29.);
}
static void
ciexyz_to_cielab(const libcolour_ciexyz_t *restrict from, libcolour_cielab_t *restrict to)
{
TYPE X = from->X, Y = from->Y, Z = from->Z;
X /= D(0.95047);
Z /= D(1.08883);
Y = cielab_f(Y);
to->L = 116 * Y - 16;
to->a = 500 * (cielab_f(X) - Y);
to->b = 200 * (Y - cielab_f(Z));
}
static void
other_to_cielab(const libcolour_colour_t *restrict from, libcolour_cielab_t *restrict to)
{
libcolour_ciexyz_t tmp;
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp);
ciexyz_to_cielab(&tmp, to);
}
static void
to_cielab(const libcolour_colour_t *restrict from, libcolour_cielab_t *restrict to)
{
switch (from->model) {
case LIBCOLOUR_CIEXYZ:
ciexyz_to_cielab(&from->ciexyz, to);
return;
case LIBCOLOUR_CIELAB:
*to = from->cielab;
return;
default:
other_to_cielab(from, to);
return;
}
}
static void
ciexyz_to_cieluv(const libcolour_ciexyz_t *restrict from, libcolour_cieluv_t *restrict to)
{
TYPE t, u, v, y, y2;
t = to->white.X + 15 * to->white.Y + 3 * to->white.Z;
u = 4 * to->white.X / t;
v = 9 * to->white.Y / t;
t = from->X + 15 * from->Y + 3 * from->Z;
u = 4 * from->X / t - u;
v = 9 * from->Y / t - v;
y = from->Y / to->white.Y;
y2 = y * 24389;
y = y2 <= 216 ? y2 / 27 : xcbrt(y) * 116 - 16;
to->L = y;
y *= 13;
to->u = u * y;
to->v = v * y;
}
static void
cielchuv_to_cieluv(const libcolour_cielchuv_t *restrict from, libcolour_cieluv_t *restrict to)
{
libcolour_ciexyz_t tmp;
libcolour_cielchuv_t tmp2;
TYPE L, C, h;
if (to->white.X != from->white.X || to->white.Y != from->white.Y || to->white.Z != from->white.Z) {
tmp.model = LIBCOLOUR_CIEXYZ;
tmp2.model = LIBCOLOUR_CIELCHUV;
tmp2.white = to->white;
tmp2.one_revolution = PI2;
to_ciexyz((const libcolour_colour_t*)from, &tmp);
to_cielchuv((const libcolour_colour_t*)&tmp, &tmp2);
L = tmp2.L, C = tmp2.C, h = tmp2.h;
} else {
L = from->L, C = from->C, h = from->h * PI2 / from->one_revolution;
}
to->L = L;
to->u = C * xcos(h);
to->v = C * xsin(h);
}
static void
other_to_cieluv(const libcolour_colour_t *restrict from, libcolour_cieluv_t *restrict to)
{
libcolour_ciexyz_t tmp;
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp);
ciexyz_to_cieluv(&tmp, to);
}
static void
to_cieluv(const libcolour_colour_t *restrict from, libcolour_cieluv_t *restrict to)
{
switch (from->model) {
case LIBCOLOUR_CIEXYZ:
ciexyz_to_cieluv(&from->ciexyz, to);
break;
case LIBCOLOUR_CIELCHUV:
cielchuv_to_cieluv(&from->cielchuv, to);
break;
case LIBCOLOUR_CIELUV:
if (to->white.X == from->cieluv.white.X &&
to->white.Y == from->cieluv.white.Y &&
to->white.Z == from->cieluv.white.Z) {
*to = from->cieluv;
break;
}
/* fall through */
default:
other_to_cieluv(from, to);
break;
}
}
static void
cieluv_to_cielchuv(const libcolour_cieluv_t *restrict from, libcolour_cielchuv_t *restrict to)
{
libcolour_cieluv_t tmp;
TYPE L, u, v;
if (to->white.X != from->white.X || to->white.Y != from->white.Y || to->white.Z != from->white.Z) {
tmp.model = LIBCOLOUR_CIELUV;
tmp.white = to->white;
to_cieluv((const libcolour_colour_t *)from, &tmp);
L = tmp.L, u = tmp.u, v = tmp.v;
} else {
L = from->L, u = from->u, v = from->v;
}
to->L = L;
to->C = xsqrt(u * u + v * v);
to->h = xatan2(v, u) / PI2 * to->one_revolution;
if (!WASDIV0(to->h) && (to->h < 0))
to->h += to->one_revolution;
}
static void
other_to_cielchuv(const libcolour_colour_t *restrict from, libcolour_cielchuv_t *restrict to)
{
libcolour_cieluv_t tmp;
tmp.model = LIBCOLOUR_CIELUV;
tmp.white = to->white;
to_cieluv(from, &tmp);
cieluv_to_cielchuv(&tmp, to);
}
static void
to_cielchuv(const libcolour_colour_t *restrict from, libcolour_cielchuv_t *restrict to)
{
TYPE one_revolution;
switch (from->model) {
case LIBCOLOUR_CIELUV:
cieluv_to_cielchuv(&from->cieluv, to);
break;
case LIBCOLOUR_CIELCHUV:
if (to->white.X == from->cielchuv.white.X &&
to->white.Y == from->cielchuv.white.Y &&
to->white.Z == from->cielchuv.white.Z) {
if (to->one_revolution == from->cielchuv.one_revolution) {
*to = from->cielchuv;
} else {
one_revolution = to->one_revolution;
*to = from->cielchuv;
to->one_revolution = one_revolution;
to->h = to->h / from->cielchuv.one_revolution * one_revolution;
}
break;
}
/* fall through */
default:
other_to_cielchuv(from, to);
break;
}
}
static void
to_yiq(const libcolour_colour_t *restrict from, libcolour_yiq_t *restrict to)
{
libcolour_colour_t tmp = *from;
switch (from->model) {
case LIBCOLOUR_YIQ:
*to = from->yiq;
break;
case LIBCOLOUR_SRGB:
if (tmp.srgb.with_transfer) {
tmp.srgb.with_transfer = 0;
to_srgb(from, &tmp.srgb);
}
TRANSFORM(to->Y, to->I, to->Q, tmp.srgb.R, tmp.srgb.G, tmp.srgb.B, 0.299, 0.587, 0.114,
0.59571613491277464191853141528554260730743408203125, /* (0.877 cos 33°)(1 - 0.299) - (0.492 sin 33°)(-0.299) */
-0.27445283783925644716106262421817518770694732666016, /* (0.877 cos 33°)(-0.587) - (0.492 sin 33°)(-0.587) */
-0.32126329707351808373516632855171337723731994628906, /* (0.877 cos 33°)(-0.114) - (0.492 sin 33°)(1 - 0.114) */
0.21145640212011795888713550084503367543220520019531, /* (0.877 sin 33°)(1 - 0.299) + (0.492 cos 33°)(-0.299) */
-0.52259104529161115593183239980135113000869750976562, /* (0.877 sin 33°)(-0.587) + (0.492 cos 33°)(-0.587) */
0.31113464317149330806699936147197149693965911865234); /* (0.877 sin 33°)(-0.114) + (0.492 cos 33°)(1 - 0.114) */
break;
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp.ciexyz);
/* fall through */
case LIBCOLOUR_CIEXYZ:
TRANSFORM(to->Y, to->I, to->Q, tmp.ciexyz.X, tmp.ciexyz.Y, tmp.ciexyz.Z,
0.40627729168038273499519164033699780702590942382812,
0.61835674212166968910509012857801280915737152099609,
-0.00414330221353725880462093300593551248311996459961,
2.17852787350219845308174626552499830722808837890625,
-1.36502666214454104753883711964590474963188171386719,
-0.64803574634025240541745915834326297044754028320312,
1.20905577682138853923277110880007967352867126464844,
-1.36890364998339797431015085749095305800437927246094,
0.20180559439597040016778350945969577878713607788086);
break;
}
}
static void
to_ydbdr(const libcolour_colour_t *restrict from, libcolour_ydbdr_t *restrict to)
{
libcolour_colour_t tmp = *from;
switch (from->model) {
case LIBCOLOUR_YDBDR:
*to = from->ydbdr;
break;
case LIBCOLOUR_SRGB:
if (tmp.srgb.with_transfer) {
tmp.srgb.with_transfer = 0;
to_srgb(from, &tmp.srgb);
}
TRANSFORM(to->Y, to->Db, to->Dr, tmp.srgb.R, tmp.srgb.G, tmp.srgb.B,
0.299, 0.587, 0.114,
-0.450, -0.883, 1.333,
-1.333, 1.116, 0.217);
break;
case LIBCOLOUR_YUV:
to->Y = tmp.yuv.Y;
to->Db = tmp.yuv.U * D(3.069);
to->Dr = -tmp.yuv.V * D(2.169);
break;
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp.ciexyz);
/* fall through */
case LIBCOLOUR_CIEXYZ:
TRANSFORM(to->Y, to->Db, to->Dr, tmp.ciexyz.X, tmp.ciexyz.Y, tmp.ciexyz.Z,
0.40627729168038273499519164033699780702590942382812,
0.61835674212166968910509012857801280915737152099609,
-0.00414330221353725880462093300593551248311996459961,
-0.52816561102614745237815441214479506015777587890625,
-1.23677481526212962315014465275453403592109680175781,
1.59692761635924940222253098909277468919754028320312,
-5.38914174974103143966885909321717917919158935546875,
4.09835630362728497999569299281574785709381103515625,
0.94033545560642795013706063400604762136936187744141);
break;
}
}
static void
to_yuv(const libcolour_colour_t *restrict from, libcolour_yuv_t *restrict to)
{
libcolour_colour_t tmp = *from;
switch (from->model) {
case LIBCOLOUR_YUV:
*to = from->yuv;
break;
case LIBCOLOUR_YDBDR:
to->Y = from->ydbdr.Y;
to->U = from->ydbdr.Db / D(3.069);
to->V = from->ydbdr.Dr / D(-2.169);
break;
case LIBCOLOUR_SRGB:
if (tmp.srgb.with_transfer) {
tmp.srgb.with_transfer = 0;
to_srgb(from, &tmp.srgb);
}
TRANSFORM(to->Y, to->U, to->V, tmp.srgb.R, tmp.srgb.G, tmp.srgb.B,
0.29899999999999998800959133404830936342477798461914,
0.58699999999999996624922005139524117112159729003906,
0.11400000000000000410782519111307919956743717193604,
-0.14662756598240470062854967636667424812912940979004,
-0.28771586836102963635752871596196200698614120483398,
0.43434343434343436474165400795754976570606231689453,
0.61456892577224520035628074765554629266262054443359,
-0.51452282157676354490405401520547457039356231689453,
-0.10004610419548178035231700278018251992762088775635);
break;
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp.ciexyz);
/* fall through */
case LIBCOLOUR_CIEXYZ:
TRANSFORM(to->Y, to->U, to->V, tmp.ciexyz.X, tmp.ciexyz.Y, tmp.ciexyz.Z,
0.40627729168038273499519164033699780702590942382812,
0.61835674212166968910509012857801280915737152099609,
-0.00414330221353725880462093300593551248311996459961,
-0.17209697328971895746718701047939248383045196533203,
-0.40298951295605395239718404809536878019571304321289,
0.52034135430408912093014350830344483256340026855469,
2.48462044709130047692724474472925066947937011718750,
-1.88951420176453876997868519538315013051033020019531,
-0.43353409663735725798616726933687459677457809448242);
break;
}
}
static void
to_ypbpr(const libcolour_colour_t *restrict from, libcolour_ypbpr_t *restrict to)
{
libcolour_colour_t tmp = *from;
switch (from->model) {
case LIBCOLOUR_YPBPR:
*to = from->ypbpr;
break;
case LIBCOLOUR_SRGB:
if (tmp.srgb.with_transfer) {
tmp.srgb.with_transfer = 0;
to_srgb(from, &tmp.srgb);
}
to->Y = tmp.srgb.R * D(0.2126) +
tmp.srgb.G * D(0.7152) +
tmp.srgb.B * D(0.0722);
to->Pb = tmp.srgb.B - to->Y;
to->Pr = tmp.srgb.R - to->Y;
break;
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp.ciexyz);
/* fall through */
case LIBCOLOUR_CIEXYZ:
TRANSFORM(to->Y, to->Pb, to->Pr, tmp.ciexyz.X, tmp.ciexyz.Y, tmp.ciexyz.Z,
-0.00028314209073960778378920011277841695118695497513,
1.00019821310075673892470149439759552478790283203125,
0.00006512054470741990286342115723527967929840087891,
0.05592664565509243568275365987574332393705844879150,
-1.20422439283671711685030913940863683819770812988281,
1.05716144717799576113748116767965257167816162109375,
3.24072939673847715269516811531502753496170043945312,
-2.53733297492083753610359053709544241428375244140625,
-0.49859531356743613805804216099204495549201965332031);
break;
}
}
static void
to_ycgco(const libcolour_colour_t *restrict from, libcolour_ycgco_t *restrict to)
{
libcolour_colour_t tmp = *from;
switch (from->model) {
case LIBCOLOUR_YCGCO:
*to = from->ycgco;
break;
case LIBCOLOUR_SRGB:
if (tmp.srgb.with_transfer) {
tmp.srgb.with_transfer = 0;
to_srgb(from, &tmp.srgb);
}
to->Y = tmp.srgb.R / 4 + tmp.srgb.G / 2 + tmp.srgb.B / 4;
to->Cg = -tmp.srgb.R / 4 + tmp.srgb.G / 2 - tmp.srgb.B / 4;
to->Co = tmp.srgb.R / 2 - tmp.srgb.B / 2;
break;
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp.ciexyz);
/* fall through */
case LIBCOLOUR_CIEXYZ:
TRANSFORM(to->Y, to->Cg, to->Co, tmp.ciexyz.X, tmp.ciexyz.Y, tmp.ciexyz.Z,
0.33938913643068269188063368346774950623512268066406,
0.50271574450517486631895280879689380526542663574219,
0.16045211478220866574417868832824751734733581542969,
-1.30865574267536244335019546269904822111129760742188,
1.37329621528319534284889869013568386435508728027344,
-0.11889607256777862120955546743061859160661697387695,
1.59240137554169236544510113162687048316001892089844,
-0.66655429104206020962664069884340278804302215576172,
-0.77787838037271606062006412685150280594825744628906);
break;
}
}
static void
to_cie1960ucs(const libcolour_colour_t *restrict from, libcolour_cie1960ucs_t *restrict to)
{
libcolour_colour_t tmp = *from;
TYPE u, v, w, y;
switch (from->model) {
case LIBCOLOUR_CIE1960UCS:
*to = from->cie1960ucs;
return;
case LIBCOLOUR_CIEUVW:
u = from->cieuvw.U, v = from->cieuvw.V, w = from->cieuvw.W;
y = (w + 17) / 25;
y *= y * y;
w *= 13;
to->u = u / w + from->cieuvw.u0;
to->v = v / w + from->cieuvw.v0;
to->Y = y;
return;
default:
tmp.model = LIBCOLOUR_CIEXYZ;
to_ciexyz(from, &tmp.ciexyz);
/* fall through */
case LIBCOLOUR_CIEXYZ:
w = tmp.ciexyz.X + 15 * tmp.ciexyz.Y + 3 * tmp.ciexyz.Z;
to->u = 4 * tmp.ciexyz.X / w;
to->v = 6 * tmp.ciexyz.Y / w;
to->Y = tmp.ciexyz.Y;
return;
}
}
static void
to_cieuvw(const libcolour_colour_t *restrict from, libcolour_cieuvw_t *restrict to)
{
TYPE U, V, W, w;
libcolour_colour_t tmp = *from;
switch (from->model) {
case LIBCOLOUR_CIEUVW:
U = from->cieuvw.U, V = from->cieuvw.V, W = from->cieuvw.W;
w = W * 13;
U += w * (from->cieuvw.u0 - to->u0);
V += w * (from->cieuvw.v0 - to->v0);
to->U = U, to->V = V, to->W = W;
break;
default:
tmp.model = LIBCOLOUR_CIE1960UCS;
to_cie1960ucs(from, &tmp.cie1960ucs);
/* fall through */
case LIBCOLOUR_CIE1960UCS:
U = tmp.cie1960ucs.u, V = tmp.cie1960ucs.v, W = tmp.cie1960ucs.Y;
W = 25 * xcbrt(W) - 17;
w = W * 13;
to->U = w * (U - to->u0);
to->V = w * (V - to->v0);
to->W = W;
break;
}
}
int
libcolour_convert(const libcolour_colour_t *restrict from, libcolour_colour_t *restrict to)
{
#define X(C, T, N) 1 +
if (from->model < 0 || from->model > LIST_MODELS(X) 0) {
#undef X
errno = EINVAL;
return -1;
}
switch (to->model) {
case LIBCOLOUR_RGB:
to_rgb(from, &to->rgb);
break;
case LIBCOLOUR_SRGB:
to_srgb(from, &to->srgb);
break;
case LIBCOLOUR_CIEXYY:
to_ciexyy(from, &to->ciexyy);
break;
case LIBCOLOUR_CIEXYZ:
to_ciexyz(from, &to->ciexyz);
break;
case LIBCOLOUR_CIELAB:
to_cielab(from, &to->cielab);
break;
case LIBCOLOUR_CIELUV:
to_cieluv(from, &to->cieluv);
break;
case LIBCOLOUR_CIELCHUV:
to_cielchuv(from, &to->cielchuv);
break;
case LIBCOLOUR_YIQ:
to_yiq(from, &to->yiq);
break;
case LIBCOLOUR_YDBDR:
to_ydbdr(from, &to->ydbdr);
break;
case LIBCOLOUR_YUV:
to_yuv(from, &to->yuv);
break;
case LIBCOLOUR_YPBPR:
to_ypbpr(from, &to->ypbpr);
break;
case LIBCOLOUR_YCGCO:
to_ycgco(from, &to->ycgco);
break;
case LIBCOLOUR_CIE1960UCS:
to_cie1960ucs(from, &to->cie1960ucs);
break;
case LIBCOLOUR_CIEUVW:
to_cieuvw(from, &to->cieuvw);
break;
default:
errno = EINVAL;
return -1;
}
return 0;
}
