feat(bar): 实现 bar_draw 渲染骨架及文字排版绘制接口

src/bar/text.h

@@ -1,9 +1,27 @@
 #pragma once
 
+#include <cairo.h>
 #include <stdint.h>
+#include <zdwm/types.h>
+
+#include "base/color.h"
 
 typedef struct text_context_t text_context_t;
 
 text_context_t *
 text_context_create(const char *family, uint32_t size, uint32_t dpi);
 void text_context_destory(text_context_t *context);
+void text_context_get_text_size(
+  text_context_t *context,
+  const char *text,
+  int32_t *width,
+  int32_t *height
+);
+void draw_text(
+  cairo_t *cr,
+  text_context_t *context,
+  const char *text,
+  color_t *color,
+  zdwm_rect_t area
+);
+void draw_background(cairo_t *cr, color_t *color, zdwm_rect_t area);