diff options
Diffstat (limited to 'src/util')
| -rw-r--r-- | src/util/colour.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/util/colour.h b/src/util/colour.h index ff40841..854705a 100644 --- a/src/util/colour.h +++ b/src/util/colour.h @@ -29,6 +29,30 @@ srgb_decode(double t) } static inline void +yuv_to_srgb(double y, double u, double v, double *r, double *g, double *b) +{ +#define MULTIPLY(CY, CU, CV) ((CY) * y + (CU) * u + (CV) * v) + *r = MULTIPLY(1, 0.00028328010485821202317155420580263580632163211703, 1.14070449590558520291949662350816652178764343261719); + *g = MULTIPLY(1, -0.39630886669497211727275498560629785060882568359375, -0.58107364288228224857846271333983168005943298339844); + *b = MULTIPLY(1, 2.03990003507541306504435851820744574069976806640625, 0.00017179031692307700847528739718228507626918144524); +#undef MULTIPLY +} + +static inline void +srgb_to_yuv(double r, double g, double b, double *y, double *u, double *v) +{ +#define MULTIPLY(CR, CG, CB) ((CR) * r + (CG) * g + (CB) * b) + *y = MULTIPLY(0.299, 0.587, 0.114); + *u = MULTIPLY(-0.14662756598240470062854967636667424812912940979004, + -0.28771586836102963635752871596196200698614120483398, + 0.43434343434343436474165400795754976570606231689453); + *v = MULTIPLY( 0.61456892577224520035628074765554629266262054443359, + -0.51452282157676354490405401520547457039356231689453, + -0.10004610419548178035231700278018251992762088775635); +#undef MULTIPLY +} + +static inline void ciexyz_to_srgb(double x, double y, double z, double *r, double *g, double *b) { #define MULTIPLY(CX, CY, CZ) ((CX) * x + (CY) * y + (CZ) * z) |