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-/**
- * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#ifndef LIBRED_H
-#define LIBRED_H
-
-
-
-/**
- * Approximate apparent size of the Sun in degrees.
- */
-#define LIBRED_SOLAR_APPARENT_RADIUS (32.0 / 60.0)
-
-
-/**
- * The Sun's elevation at sunset and sunrise, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE (-32.0 / 60.0)
-
-/**
- * The Sun's elevation at civil dusk and civil dawn, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN (-6.0)
-
-/**
- * The Sun's elevation at nautical dusk and nautical dawn, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN (-12.0)
-
-/**
- * The Sun's elevation at astronomical dusk and astronomical dawn, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN (-18.0)
-
-/**
- * The Sun's elevation at amateur astronomical dusk and amateur astronomical dawn, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_AMATEUR_ASTRONOMICAL_DUSK_DAWN (-15.0)
-
-/**
- * The Sun's lowest elevation during the golden hour, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_GOLDEN_HOUR_LOW (-4.0)
-
-/**
- * The Sun's highest elevation during the golden hour, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_GOLDEN_HOUR_HIGH (6.0)
-
-/**
- * The Sun's lowest elevation during the blue hour, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_BLUE_HOUR_LOW (-6.0)
-
-/**
- * The Sun's highest elevation during the blue hour, measured in degrees.
- */
-#define LIBRED_SOLAR_ELEVATION_BLUE_HOUR_HIGH (-4.0)
-
-
-/**
- * Test whether it is twilight.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is twilight, 0 otherwise.
- */
-#define LIBRED_IS_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -32.0 / 60.0))
-
-/**
- * Test whether it is civil twilight.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is civil twilight, 0 otherwise.
- */
-#define LIBRED_IS_CIVIL_TWILIGHT(ELEV) ((-6.0 <= (ELEV)) && ((ELEV) <= -32.0 / 60.0))
-
-/**
- * Test whether it is nautical twilight.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is nautical twilight, 0 otherwise.
- */
-#define LIBRED_IS_NAUTICAL_TWILIGHT(ELEV) ((-12.0 <= (ELEV)) && ((ELEV) <= -32.0 / 60.0))
-
-/**
- * Test whether it is astronomical twilight.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is astronomical twilight, 0 otherwise.
- */
-#define LIBRED_IS_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -32.0 / 60.0))
-
-/**
- * Test whether it is amateur astronomical twilight.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is amatuer astronomical twilight, 0 otherwise.
- */
-#define LIBRED_IS_AMATEUR_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -15.0))
-
-/**
- * Test whether it is nighttime.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is nighttime, 0 otherwise.
- */
-#define LIBRED_IS_NIGHTTIME(ELEV) ((ELEV) < -18.0)
-
-/**
- * Test whether it is daytime.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is daytime, 0 otherwise.
- */
-#define LIBRED_IS_DAYTIME(ELEV) ((ELEV) > -32.0 / 60.0)
-
-/**
- * Test whether it is the golden hour.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is golden hour, 0 otherwise.
- */
-#define LIBRED_IS_GOLDEN_HOUR(ELEV) ((-4.0 <= (ELEV)) && ((ELEV) <= 6.0))
-
-/**
- * Test whether it is the blue hour.
- *
- * @param ELEV:double The current elevation.
- * @return 1 if is blue hour, 0 otherwise.
- */
-#define LIBRED_IS_BLUE_HOUR(ELEV) ((-6.0 <= (ELEV)) && ((ELEV) <= -4.0))
-
-
-/**
- * Calculates the Sun's elevation as apparent
- * from a geographical position.
- *
- * @param latitude The latitude in degrees northwards from
- * the equator, negative for southwards.
- * @param longitude The longitude in degrees eastwards from
- * Greenwich, negative for westwards.
- * @return The Sun's apparent elevation as seen, right now,
- * from the specified position, measured in degrees.
- *
- * @throws 0 On success.
- * @throws Any error specified for clock_gettime(3) on error.
- */
-double libred_solar_elevation(double, double);
-
-
-/**
- * Exit if time the is before year 0 in J2000.
- *
- * @return 0 on success, -1 on error.
- */
-int libred_check_timetravel(void);
-
-
-
-/**
- * The highest colour temperature in the table.
- */
-#define LIBRED_HIGHEST_TEMPERATURE 40000
-
-/**
- * The lowest colour temperature in the table.
- */
-#define LIBRED_LOWEST_TEMPERATURE 1000
-
-/**
- * The temperature difference between the colours in the table.
- * Note, `libred_get_colour` will make interpolation for colours
- * that are not in the table.
- */
-#define LIBRED_DELTA_TEMPERATURE 100
-
-
-/**
- * The file descriptor to the colour lookup table.
- * -1 if none is open.
- */
-extern int libred_fd;
-
-/**
- * Iff this macro is define `libred_fd` is available.
- */
-#define LIBRED_HAVE_FD 1
-
-
-/**
- * This function must be called, once,
- * before calling `libred_get_colour`.
- *
- * @return 0 on success, -1 on error.
- *
- * @throws Any error specified for `open(3)`.
- */
-int libred_init_colour(void);
-
-/**
- * Call this when the process will not
- * longer make calls to `libred_get_colour`.
- */
-void libred_term_colour(void);
-
-/**
- * Get the [0, 1] sRGB values of a colour temperature.
- *
- * @param temp The desired colour temperature.
- * @param r Output parameter for the “red” value.
- * @param g Output parameter for the green value.
- * @param b Output parameter for the blue value.
- * @return 0 on succeess, -1 on error.
- *
- * @throws EOVERFLOW The file did not have the expected size.
- * @throws EDOM The selected temperature is below 1000 K.
- * @throws Any error specified for pread(3).
- */
-int libred_get_colour(long int, double*, double*, double*);
-
-
-
-#endif
-
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