perf(vg_lite): add font cache reference counting support (#7407)

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: pengyiqiang <pengyiqiang@xiaomi.com>

tests/src/lv_test_conf_full.h

@@ -165,7 +165,7 @@
 
 #define LV_USE_FREETYPE 1
 #define LV_FREETYPE_USE_LVGL_PORT 0
-#define LV_FREETYPE_CACHE_FT_GLYPH_CNT 10
+#define LV_FREETYPE_CACHE_FT_GLYPH_CNT 64
 
 #define LV_USE_FONT_MANAGER 1
 

tests/src/test_cases/libs/test_font_stress.c

@@ -204,6 +204,8 @@ void setUp(void)
 
 void tearDown(void)
 {
+    font_stress_label_delete_all(&g_ctx);
+
     lv_freetype_uninit();
     lv_free(g_ctx.label_arr);
     g_ctx.label_arr = NULL;