auto clear chars from tile font.

inc/hgl/graph/font/TextLayout.h

@@ -101,6 +101,7 @@ namespace hgl
             int draw_chars_count;                       ///<要绘制字符列表
 
             SortedSets<u32char> chars_sets;             ///<不重复字符统计缓冲区
+            SortedSets<u32char> clear_chars_sets;       ///<待清除的字符合集
             TileUVFloatMap chars_uv;                    ///<所有要绘制字符的uv
 
             struct CharDrawAttr
@@ -111,7 +112,7 @@ namespace hgl
             
             ObjectList<CharDrawAttr> draw_chars_list; ///<所有字符属性列表
 
-            template<typename T> bool preprocess(TileFont *,const T *,const int);
+            template<typename T> bool preprocess(TextRenderable *,TileFont *,const T *,const int);
 
         protected:        
 

inc/hgl/graph/font/TextRender.h

@@ -33,6 +33,8 @@ namespace hgl
             Color4f             color;
             GPUBuffer *         ubo_color;
 
+            SortedSets<TextRenderable *> tr_sets;
+
         private:
 
             friend TextRender *CreateTextRender(GPUDevice *,FontSource *,RenderPass *,GPUBuffer *);
@@ -57,6 +59,8 @@ namespace hgl
             bool Layout(TextRenderable *tr,const UTF16String &str);
 
             RenderableInstance *CreateRenderableInstance(TextRenderable *text_render_obj);
+
+            void Release(TextRenderable *);
         };//class TextRender
 
         /**

inc/hgl/graph/font/TextRenderable.h

@@ -19,10 +19,24 @@ namespace hgl
             VBO *       vbo_position;
             VBO *       vbo_tex_coord;
 
+        protected:
+
+            friend class TextLayout;
+            friend class TextRender;
+
+            SortedSets<u32char> chars_sets;
+
+            const SortedSets<u32char> &GetCharsSets()const{return chars_sets;}
+            void SetCharsSets(const SortedSets<u32char> &sl){chars_sets=sl;}
+            void ClearCharsSets(){chars_sets.Clear();}
+
+        private:
+
+            virtual ~TextRenderable();
+
         public:
 
             TextRenderable(GPUDevice *,Material *,uint mc=1024);
-            virtual ~TextRenderable();
 
         public: