diff options
Diffstat (limited to 'src/parse_10deg.c')
| -rw-r--r-- | src/parse_10deg.c | 57 |
1 files changed, 27 insertions, 30 deletions
diff --git a/src/parse_10deg.c b/src/parse_10deg.c index 1ef6947..aacf852 100644 --- a/src/parse_10deg.c +++ b/src/parse_10deg.c @@ -15,53 +15,50 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "haiku.h" +#include "blackbody.h" #include "macros.h" -#include <math.h> #include <sys/stat.h> -#define HIGHEST 40000 -#define LOWEST 1000 -#define DELTA 100 -#define EXPECTED_ELEMENTS ((HIGHEST - LOWEST) / DELTA + 1) +/** + * The number of measured temperatures. + */ +#define TEMPERATURES ((HIGHEST_TEMPERATURE - LOWEST_TEMPERATURE) / DELTA_TEMPERATURE + 1) -static void -ciexyy_to_srgb(double x, double y, double Y, double *r, double *g, double *b) -{ -#define SRGB(C) (((C) <= 0.0031308) ? (12.92 * (C)) : ((1.0 + 0.055) * pow((C), 1.0 / 2.4) - 0.055)) - double X, Z; - - /* Convert CIE xyY to CIE XYZ. */ - X = Y * (y == 0 ? 0 : (x / y)); - Z = Y * (y == 0 ? 0 : ((1 - x - y) / y)); - - /* Convert CIE XYZ to [0, 1] linear RGB. (ciexyz_to_linear) */ - *r = ( 3.240450 * X) + (-1.537140 * Y) + (-0.4985320 * Z); - *g = (-0.969266 * X) + ( 1.876010 * Y) + ( 0.0415561 * Z); - *b = (0.0556434 * X) + (-0.204026 * Y) + ( 1.0572300 * Z); - - /* Convert [0, 1] linear RGB to [0, 1] sRGB. */ - SRGB(*r), SRGB(*g), SRGB(*b); -} +/** + * Create the lookup table of temperatures. + * + * Standard input should be the file '10deg', + * standard output should be the table file + * and must be a regular file. + * + * @param argc Should be 1. + * @param argv Should only contain the name of the process. + * @return 0 on success, 1 on error. + */ int main(int argc, char *argv[]) { +#define x (xyrgb[0]) +#define y (xyrgb[1]) +#define r (xyrgb[2]) +#define g (xyrgb[3]) +#define b (xyrgb[4]) + double xyrgb[5]; struct stat attr; + long int temp = LOWEST_TEMPERATURE; - while (fscanf(stdin, "%lf %lf\n", xyrgb + 0, xyrgb + 1) == 2) { - ciexyy_to_srgb(xyrgb[0], xyrgb[1], 1.0, xyrgb + 2, xyrgb + 3, xyrgb + 4); + for (; fscanf(stdin, "%lf %lf\n", &x, &y) == 2; temp += DELTA_TEMPERATURE) { + (temp == 6500) ? (r = g = b = 1.0) : ciexyy_to_srgb(x, y, 1.0, &r, &g, &b); xwrite(STDOUT_FILENO, xyrgb, sizeof(xyrgb)); } xwrite(STDOUT_FILENO, xyrgb, sizeof(xyrgb)); /* sugar */ t (fstat(STDOUT_FILENO, &attr)); - if ((size_t)(attr.st_size) != (EXPECTED_ELEMENTS + 1) * 5 * sizeof(double)) - return 1; - - return 0; + return ((size_t)(attr.st_size) != (TEMPERATURES + 1) * 5 * sizeof(double)); fail: - return haiku(argc ? *argv : "parse_10deg"), -1; + return haiku(argc ? *argv : "parse_10deg"), 1; } |