Simplify

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 59 insertions, 89 deletions

diff --git a/libred.h b/libred.h
index 041a49e..57b17c7 100644
--- a/libred.h
+++ b/libred.h
@@ -5,216 +5,186 @@
 
 
 /**
- * Approximate apparent size of the Sun in degrees.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * 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.
+ * Test whether it is twilight
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is twilight, 0 otherwise.
+ * @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.
+ * Test whether it is civil twilight
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is civil twilight, 0 otherwise.
+ * @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.
+ * Test whether it is nautical twilight
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is nautical twilight, 0 otherwise.
+ * @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.
+ * Test whether it is astronomical twilight
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is astronomical twilight, 0 otherwise.
+ * @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.
+ * Test whether it is amateur astronomical twilight
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is amatuer astronomical twilight, 0 otherwise.
+ * @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.
+ * Test whether it is nighttime
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is nighttime, 0 otherwise.
+ * @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.
+ * Test whether it is daytime
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is daytime, 0 otherwise.
+ * @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.
+ * Test whether it is the golden hour
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is golden hour, 0 otherwise.
+ * @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.
+ * Test whether it is the blue hour
  * 
- * @param   ELEV:double  The current elevation.
- * @return               1 if is blue hour, 0 otherwise.
+ * @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.
+ * from a geographical position
  * 
  * @param   latitude   The latitude in degrees northwards from 
- *                     the equator, negative for southwards.
+ *                     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.
+ *                     Greenwich, negative for westwards
+ * @param   elevation  Output parameter for the Sun's apparent elevation
+ *                     as seen, right now, from the specified position,
+ *                     measured in degrees
+ * @return             0 on success, -1 on failure
+ * @throws             Any error specified for clock_gettime(3) on error
  */
-double libred_solar_elevation(double, double);
+double libred_solar_elevation(double, double, double *);
 
 
 /**
- * Exit if time the is before year 0 in J2000.
+ * Exit if time the is before year 0 in J2000
  * 
- * @return  0 on success, -1 on error.
+ * @return  0 on success, -1 on error
  */
 int libred_check_timetravel(void);
 
 
 
 /**
- * The highest colour temperature in the table.
+ * The highest colour temperature in the table
  */
 #define LIBRED_HIGHEST_TEMPERATURE  40000
 
 /**
- * The lowest colour temperature in the table.
+ * 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.
+ * 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.
+ * 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.
+ * @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).
+ * @throws  EDOM  The selected temperature is below 1000 K
  */
-int libred_get_colour(long int, double*, double*, double*);
+int libred_get_colour(long int, double *, double *, double *);