+/**
+ * @brief Maximum size of glyph cache per each font face.
+ */
+constexpr std::size_t DEFAULT_GLYPH_CACHE_MAX = 128;
+constexpr std::size_t MINIMUM_SIZE_OF_GLYPH_CACHE_MAX = 3u;
+
+constexpr auto MAX_NUMBER_OF_GLYPH_CACHE_ENV = "DALI_GLYPH_CACHE_MAX";
+
+/**
+ * @brief Get maximum size of glyph cache size from environment.
+ * If not settuped, default as 128.
+ * @note This value fixed when we call it first time.
+ * @return The max size of glyph cache.
+ */
+inline size_t GetMaxNumberOfGlyphCache()
+{
+ using Dali::EnvironmentVariable::GetEnvironmentVariable;
+ static auto numberString = GetEnvironmentVariable(MAX_NUMBER_OF_GLYPH_CACHE_ENV);
+ static auto number = numberString ? std::strtoul(numberString, nullptr, 10) : DEFAULT_GLYPH_CACHE_MAX;
+ return (number < MINIMUM_SIZE_OF_GLYPH_CACHE_MAX) ? MINIMUM_SIZE_OF_GLYPH_CACHE_MAX : number;
+}
+