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Diffstat (limited to '')
| -rw-r--r-- | convert-template.c | 1162 |
1 files changed, 1162 insertions, 0 deletions
diff --git a/convert-template.c b/convert-template.c new file mode 100644 index 0000000..d06ccc0 --- /dev/null +++ b/convert-template.c @@ -0,0 +1,1162 @@ +/* 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) + + + +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; +} |