diff options
Diffstat (limited to 'src/util.h')
| -rw-r--r-- | src/util.h | 42 |
1 files changed, 41 insertions, 1 deletions
@@ -1,7 +1,11 @@ /* See LICENSE file for copyright and license details. */ - +#include <errno.h> #include <math.h> #include <stdio.h> +#include <stdlib.h> + +#define D65_XYY_X 0.312726871026564878786047074755 +#define D65_XYY_Y 0.329023206641284038376227272238 #define ELEMENTSOF(ARRAY) (sizeof(ARRAY) / sizeof(*(ARRAY))) @@ -31,6 +35,21 @@ DEF_STR_TO_INT(toi, int, tolli, long long int) #define toju tollu #define toji tolli +static inline int +tolf(const char *s, double *out) +{ + char *end; + errno = 0; + *out = strtod(s, &end); + if (errno) { + return -1; + } else if (*end) { + errno = EINVAL; + return -1; + } + return 0; +} + int fshut(FILE *fp, const char *fname); void enfshut(int status, FILE *fp, const char *fname); void efshut(FILE *fp, const char *fname); @@ -58,3 +77,24 @@ srgb_decode(double t) t = t <= 0.0031306684425217108 * 12.92 ? t / 12.92 : pow((t + 0.055) / 1.055, 2.4); return t * sign; } + +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) + *r = MULTIPLY(3.240446254647737500675930277794, -1.537134761820080575134284117667, -0.498530193022728718155178739835); + *g = MULTIPLY(-0.969266606244679751469561779231, 1.876011959788370209167851498933, 0.041556042214430065351304932619); + *b = MULTIPLY(0.055643503564352832235773149705, -0.204026179735960239147729566866, 1.057226567722703292062647051353); +#undef MULTIPLY +} + +static inline void +srgb_to_ciexyz(double r, double g, double b, double *x, double *y, double *z) +{ +#define MULTIPLY(CR, CG, CB) ((CR) * r + (CG) * g + (CB) * b) + *x = MULTIPLIY(0.412457445582367576708548995157, 0.357575865245515878143578447634, 0.180437247826399665973085006954); + *y = MULTIPLIY(0.212673370378408277403536885686, 0.715151730491031756287156895269, 0.072174899130559869164791564344); + *z = MULTIPLIY(0.019333942761673460208893260415, 0.119191955081838593666354597644, 0.950302838552371742508739771438); +#undef MULTIPLY + +} |