diff options
Diffstat (limited to 'src/util')
| -rw-r--r-- | src/util/colour.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/util/colour.h b/src/util/colour.h index 854705a..84c543c 100644 --- a/src/util/colour.h +++ b/src/util/colour.h @@ -71,3 +71,35 @@ srgb_to_ciexyz(double r, double g, double b, double *x, double *y, double *z) *z = MULTIPLY(0.019333942761673460208893260415, 0.119191955081838593666354597644, 0.950302838552371742508739771438); #undef MULTIPLY } + +static inline void +scaled_yuv_to_ciexyz(double y, double u, double v, double *xp, double *yp, double *zp) +{ +#define MULTIPLY(CY, CU, CV) ((CY) * y + (CU) * u + (CV) * v) + *xp = MULTIPLY( 0.00001450325106667098632156481796684488472237717360, + 0.00000345586790639342739093228633329157872822179343, + 0.00000400923398630552893485111398685916128670214675); + *yp = MULTIPLY( 0.00001525902189669641837040624243737596543724066578, + -0.00000207722814409390653614547427030512238843584782, + -0.00000263898607692305410302407824019166326934282552); + *zp = MULTIPLY( 0.00001661446153041708825425643025752719950105529279, + 0.00002885925752619118069149627137104374696718878113, + -0.00000071781086875769179526501342566979779746816348); +#undef MULTIPLY +} + +static inline void +ciexyz_to_scaled_yuv(double x, double y, double z, double *yp, double *up, double *vp) +{ +#define MULTIPLY(CX, CY, CZ) ((CX) * x + (CY) * y + (CZ) * z) + *yp = MULTIPLY( 26625.38231027395886485464870929718017578125, + 40524.0090949436053051613271236419677734375, + -271.5313105642117079696618020534515380859375); + *up = MULTIPLY( -11278.3751445417292416095733642578125, + -26409.91773157499847002327442169189453125, + 34100.5706543184860493056476116180419921875); + *vp = MULTIPLY( 162829.60100012840121053159236907958984375, + -123829.313212639070115983486175537109375, + -28411.65702312920984695665538311004638671875); +#undef MULTIPLY +} |