Font atlas texture initialization delayed (#19592)

Author: minggo

cocos/2d/CCFontAtlas.cpp

@@ -73,8 +73,6 @@ FontAtlas::FontAtlas(Font &theFont)
             _letterPadding += 2 * FontFreeType::DistanceMapSpread;    
         }
 
-        reinit();
-
 #if CC_ENABLE_CACHE_TEXTURE_DATA
         auto eventDispatcher = Director::getInstance()->getEventDispatcher();
 
@@ -370,7 +368,10 @@ bool FontAtlas::prepareLetterDefinitions(const std::u32string& utf32Text)
     if (_fontFreeType == nullptr)
     {
         return false;
-    } 
+    }
+
+    if (!_currentPageData)
+        reinit(); 
 
     std::unordered_map<unsigned int, unsigned int> codeMapOfNewChar;
     findNewCharacters(utf32Text, codeMapOfNewChar);