From 824b2704df43f5a455e9ed9c01d871d1436be912 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <m@maandree.se>
Date: Sat, 8 Mar 2025 15:47:33 +0100
Subject: minor misc improvements
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Signed-off-by: Mattias Andrée <m@maandree.se>
---
 src/common.h | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 71 insertions(+), 2 deletions(-)

(limited to 'src/common.h')

diff --git a/src/common.h b/src/common.h
index 0b89b8f..22253e7 100644
--- a/src/common.h
+++ b/src/common.h
@@ -35,6 +35,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
+#include <limits.h>
 #include <locale.h>
 #include <math.h>
 #include <signal.h>
@@ -116,17 +117,85 @@
 #define WITHIN(LO, X, UP)  ((LO) <= (X) && (X) <= (UP))
 
 
+/**
+ * Minimum valid latitude
+ */
+#define MIN_LATITUDE -90.0
+
+/**
+ * Maximum valid latitude
+ */
+#define MAX_LATITUDE 90.0
+
+/**
+ * Minimum valid longitude
+ */
+#define MIN_LONGITUDE -180.0
+
+/**
+ * Maximum valid longitude
+ */
+#define MAX_LONGITUDE 180.0
+
+/**
+ * Minimum allowed colour temperature
+ */
+#define MIN_TEMPERATURE ((unsigned long int)LIBRED_LOWEST_TEMPERATURE)
+
+/**
+ * Maximum allowed colour temperature
+ */
+#define MAX_TEMPERATURE ULONG_MAX
+
+/**
+ * Minimum allowed whitepoint brightness
+ */
+#define MIN_BRIGHTNESS 0.1
+
+/**
+ * Maximum allowed whitepoint brightness
+ */
+#define MAX_BRIGHTNESS 1.0
+
+/**
+ * Minimum allowed gamma
+ */
+#define MIN_GAMMA 0.1
+
+/**
+ * Maximum allowed gamma
+ */
+#define MAX_GAMMA 10.0
+
+
 /**
  * The colour temperature corresponding to no effect
  */
-#define NEUTRAL_TEMP  6500U
+#define NEUTRAL_TEMPERATURE  6500UL
+
+/**
+ * The whitepoint brightness corresponding to
+ * full brightness (no effect)
+ */
+#define NEUTRAL_BRIGHTNESS  1.0
+
+/**
+ * The gamma corresponding to no effect (linear output level curve)
+ */
+#define NEUTRAL_GAMMA  1.0
+
 
 /**
  * Initialiser for `struct color_setting`
  * 
  * Sets all values to their neutral values (no effects applied)
  */
-#define COLOR_SETTING_NEUTRAL  ((struct color_setting){NEUTRAL_TEMP, 1.0, {1.0, 1.0, 1.0}})
+#define COLOR_SETTING_NEUTRAL\
+	((struct color_setting){\
+		NEUTRAL_TEMPERATURE,\
+		NEUTRAL_BRIGHTNESS,\
+		{NEUTRAL_GAMMA, NEUTRAL_GAMMA, NEUTRAL_GAMMA}\
+	})
 
 
 /**
-- 
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