创建每个屏幕对应的信息条窗口

src/renderer/CMakeLists.txt

@@ -1,7 +1,7 @@
 set(LIB_RENDERER "zswm-renderer")
 set(LIB_RENDERER_NAME ${LIB_RENDERER} PARENT_SCOPE)
 
-add_library(${LIB_RENDERER} STATIC image.c)
+add_library(${LIB_RENDERER} STATIC image.c text.c)
 target_include_directories(${LIB_RENDERER} SYSTEM
     PRIVATE ${RENDERER_INCLUDE_DIRS}
 )

src/renderer/text.c

@@ -0,0 +1,51 @@
+#include <glib-object.h>
+#include <pango/pango-attributes.h>
+#include <pango/pango-context.h>
+#include <pango/pango-font.h>
+#include <pango/pango-fontmap.h>
+#include <pango/pango-layout.h>
+#include <pango/pango-types.h>
+#include <pango/pangocairo.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "renderer.h"
+
+static PangoContext *context = NULL;
+
+uint32_t get_font_height(const char *font_family, const uint32_t font_size,
+                         const uint32_t dpi) {
+  clean_pango_context();
+
+  PangoFontMap *fontmap = pango_cairo_font_map_new();
+  context = pango_font_map_create_context(fontmap);
+
+  pango_cairo_context_set_resolution(context, dpi);
+  PangoLanguage *lang = pango_context_get_language(context);
+  PangoAttrList *attr_list = pango_attr_list_new();
+
+  PangoFontDescription *desc = pango_font_description_from_string(font_family);
+  pango_font_description_set_size(desc, font_size * PANGO_SCALE);
+
+  PangoAttribute *attr = pango_attr_font_desc_new(desc);
+  pango_attr_list_insert(attr_list, attr);
+  pango_attr_list_unref(attr_list);
+
+  PangoFontMetrics *metrics = pango_context_get_metrics(context, desc, lang);
+  int ascent = pango_font_metrics_get_ascent(metrics);
+  int descent = pango_font_metrics_get_descent(metrics);
+  uint32_t font_height = PANGO_PIXELS(ascent + descent);
+
+  pango_font_metrics_unref(metrics);
+  pango_font_description_free(desc);
+  g_object_unref(fontmap);
+
+  return font_height;
+}
+
+void clean_pango_context(void) {
+  if (!context) return;
+
+  g_object_unref(context);
+  context = NULL;
+}