窗口管理器状态机设计

src/color.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct color_t {
+  uint32_t rgba; /* use for human reading */
+  uint32_t argb; /* use for xcb */
+
+  /* channels of color, use for cairo */
+  double red;   /* red channel */
+  double green; /* green channel */
+  double blue;  /* blue channel */
+  double alpha; /* alpha channel */
+} color_t;
+
+/**
+ * @brief parsing color represented in hexadecimal format
+ * @param hex color represented in hexadecimal format, the supported format
+   have: RGB/RGBA/RRGGBB/RRGGBBAA/#RGB/#RGBA/#RRGGBB/#RRGGBBAA
+ * @param color return the parsed color
+ */
+void parse_color(const char *hex, color_t *const color);