From 60739263729e36f99b4c9279447c622acd3bd04c Mon Sep 17 00:00:00 2001
From: Federico Angelilli <code@fedang.net>
Date: Thu, 11 Jul 2024 16:28:28 +0200
Subject: Add color config type

---
 src/config.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 61 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/config.c b/src/config.c
index 07f5743..93b4f53 100644
--- a/src/config.c
+++ b/src/config.c
@@ -17,6 +17,7 @@ typedef enum {
     CONFIG_UINT,
     CONFIG_DOUBLE,
     CONFIG_BOOL,
+    CONFIG_COLOR,
 } config_type_t;
 
 typedef struct {
@@ -73,6 +74,13 @@ static bool config_read_uint(const char *value, unsigned int *result)
     return *end == '\0' && n != ULONG_MAX;
 }
 
+static bool config_read_double(const char *value, double *result)
+{
+    char *end;
+    *result = strtod(value, &end);
+    return *end == '\0';
+}
+
 static bool config_read_bool(const char *value, bool *result)
 {
     size_t lenght = strlen(value);
@@ -91,11 +99,53 @@ static bool config_read_bool(const char *value, bool *result)
     return false;
 }
 
-static bool config_read_double(const char *value, double *result)
+static bool config_read_color(const char *value, color_t *result)
 {
-    char *end;
-    *result = strtod(value, &end);
-    return *end == '\0';
+    if (!strcmp(value, "rgb")) {
+        log_panic("TODO");
+    }
+
+    if (value[0] == '#') {
+        char *end;
+        unsigned long n = strtoul(value + 1, &end, 16);
+
+        if (end[0] != '\0')
+            return false;
+
+        int bpc = 0;
+        switch (end - (value + 1)) {
+                case 3:
+                    bpc = 4;
+                    n = (n << 4) | 0x0f;
+                    break;
+
+                case 6:
+                    bpc = 8;
+                    n = (n << 8) | 0xff;
+                    break;
+
+                case 4:
+                    bpc = 4;
+                    break;
+
+                case 8:
+                    bpc = 8;
+                    break;
+
+                default:
+                    return false;
+        }
+
+        const unsigned int single_max = (1 << bpc) - 1;
+        result->r = ((n >> 3 * bpc) & single_max) / (double)single_max;
+        result->g = ((n >> 2 * bpc) & single_max) / (double)single_max;
+        result->b = ((n >> 1 * bpc) & single_max) / (double)single_max;
+        result->a = ((n >> 0 * bpc) & single_max) / (double)single_max;
+        return true;
+    }
+
+    log_debug("Invalid color '%s'", value);
+    return false;
 }
 
 static bool config_entry(config_t *config, int line, const char *section, const char *key, const char *value)
@@ -160,6 +210,13 @@ static bool config_entry(config_t *config, int line, const char *section, const
                     }
                     break;
 
+                case CONFIG_COLOR:
+                    if (config_read_color(value, (color_t *)result)) {
+                        log_debug("Config '%s' set to '%s'", key, value);
+                        return true;
+                    }
+                    break;
+
                 default:
                     log_panic("Unreachable");
             }
-- 
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