options: support shadow-color as a commandline option

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/config_libconfig.c

@@ -21,21 +21,6 @@
 
 #pragma GCC diagnostic error "-Wunused-parameter"
 
-/**
- * Hex color to rgb
- */
-struct color hex_to_rgb(const char *hex) {
-	struct color rgb;
-	// Ignore the # in front of the string
-	const char *sane_hex = hex + 1;
-	int hex_color = (int)strtol(sane_hex, NULL, 16);
-	rgb.red = (float)(hex_color >> 16) / 256;
-	rgb.green = (float)((hex_color & 0x00ff00) >> 8) / 256;
-	rgb.blue = (float)(hex_color & 0x0000ff) / 256;
-
-	return rgb;
-}
-
 /**
  * Wrapper of libconfig's <code>config_lookup_int</code>.
  *

src/options.c

@@ -96,6 +96,9 @@ static void usage(const char *argv0, int ret) {
 	    "--write-pid-path path\n"
 	    "  Write process ID to a file.\n"
 	    "\n"
+	    "--shadow-color color\n"
+	    "  Color of shadow, as a hex RGB string (defaults to #000000)\n"
+	    "\n"
 	    "--shadow-red value\n"
 	    "  Red color value of shadow (0.0 - 1.0, defaults to 0).\n"
 	    "\n"
@@ -435,6 +438,7 @@ static const struct option longopts[] = {
     {"blur-method", required_argument, NULL, 328},
     {"blur-size", required_argument, NULL, 329},
     {"blur-deviation", required_argument, NULL, 330},
+    {"shadow-color", required_argument, NULL, 331},
     {"experimental-backends", no_argument, NULL, 733},
     {"monitor-repaint", no_argument, NULL, 800},
     {"diagnostics", no_argument, NULL, 801},
@@ -604,6 +608,14 @@ bool get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 		case 256:
 			// --config
 			break;
+		case 331:;
+			// --shadow-color
+			struct color rgb;
+			rgb = hex_to_rgb(optarg);
+			opt->shadow_red = rgb.red;
+			opt->shadow_green = rgb.green;
+			opt->shadow_blue = rgb.blue;
+			break;
 		case 257:
 			// --shadow-red
 			opt->shadow_red = atof(optarg);

src/utils.h

@@ -15,6 +15,7 @@
 #include <test.h>
 
 #include "compiler.h"
+#include "types.h"
 
 #define ARR_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
 
@@ -165,6 +166,21 @@ static inline double attr_const normalize_d(double d) {
 	return normalize_d_range(d, 0.0, 1.0);
 }
 
+/**
+ * Convert a hex RGB string to RGB
+ */
+static inline struct color hex_to_rgb(const char *hex) {
+	struct color rgb;
+	// Ignore the # in front of the string
+	const char *sane_hex = hex + 1;
+	int hex_color = (int)strtol(sane_hex, NULL, 16);
+	rgb.red = (float)(hex_color >> 16) / 256;
+	rgb.green = (float)((hex_color & 0x00ff00) >> 8) / 256;
+	rgb.blue = (float)(hex_color & 0x0000ff) / 256;
+
+	return rgb;
+}
+
 attr_noret void
 report_allocation_failure(const char *func, const char *file, unsigned int line);