diff options
| -rw-r--r-- | src/convert.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/convert.c b/src/convert.c index 455d434..0ca9ef1 100644 --- a/src/convert.c +++ b/src/convert.c @@ -133,18 +133,28 @@ static void ciexyz_to_srgb(const libcolour_ciexyz_t* restrict from, libcolour_sr to->B = 0.0556434 * X + -0.204026 * Y + 1.0572300 * Z; } +static inline double srgb_encode(double x) +{ + return x <= 0.0031306684425217108 ? 12.92 * x : 1.055 * pow(x, 1 / 2.4) - 0.055; +} + +static inline double srgb_decode(double x) +{ + return x <= 0.040448236277380506 ? x / 12.92 : pow((x + 0.055) / 1.055, 2.4); +} + static void srgb_to_srgb(const libcolour_srgb_t* restrict from, libcolour_srgb_t* restrict to) { if (from->with_gamma == to->with_gamma) { *to = *from; } else if (to->with_gamma) { - to->R = libcolour_srgb_encode(from->R); - to->G = libcolour_srgb_encode(from->G); - to->B = libcolour_srgb_encode(from->B); + to->R = srgb_encode(from->R); + to->G = srgb_encode(from->G); + to->B = srgb_encode(from->B); } else { - to->R = libcolour_srgb_decode(from->R); - to->G = libcolour_srgb_decode(from->G); - to->B = libcolour_srgb_decode(from->B); + to->R = srgb_decode(from->R); + to->G = srgb_decode(from->G); + to->B = srgb_decode(from->B); } } |