perf(border render speed up): cache border infomationn

src/global/border.js

@@ -6,6 +6,10 @@ import Store from '../store';
 function getBorderInfoCompute(sheetIndex) {
     let borderInfoCompute = {};
 
+    if(Store.borderInfoCache!=null){
+        return Store.borderInfoCache;
+    }
+
     let cfg, data; 
     if(sheetIndex == null){
         cfg = Store.config;
@@ -1026,6 +1030,8 @@ function getBorderInfoCompute(sheetIndex) {
         }
     }
 
+    Store.borderInfoCache = borderInfoCompute;
+
     return borderInfoCompute;
 }
 

src/global/draw.js

@@ -1018,6 +1018,10 @@ function luckysheetDrawMain(scrollWidth, scrollHeight, drawWidth, drawHeight, of
             let bd_r = x.substr(0, x.indexOf('_'));
             let bd_c = x.substr(x.indexOf('_') + 1);
 
+            if(bd_r < dataset_row_st || bd_r > dataset_row_ed || bd_c < dataset_col_st || bd_c > dataset_col_ed){
+                continue;
+            }
+
             if(borderOffset[bd_r + "_" + bd_c]){
                 let start_r = borderOffset[bd_r + "_" + bd_c].start_r;
                 let start_c = borderOffset[bd_r + "_" + bd_c].start_c;
@@ -1064,6 +1068,8 @@ function luckysheetDrawMain(scrollWidth, scrollHeight, drawWidth, drawHeight, of
     Store.measureTextCacheTimeOut = setTimeout(() => {
         Store.measureTextCache = {};
         Store.measureTextCellInfoCache = {};
+        Store.borderInfoCache = null;
+        Store.cellOverflowMapCache = null;
     }, 2000);
 }
 
@@ -1954,6 +1960,10 @@ let cellOverflowRender = function(r, c, stc, edc,luckysheetTableContent,scrollHe
 function getCellOverflowMap(canvas, col_st, col_ed, row_st, row_end){
     let map = {};
 
+    if(Store.cellOverflowMapCache!=null){
+        return Store.cellOverflowMapCache;
+    }
+
     let data = Store.flowdata;
 
     for(let r = row_st; r <= row_end; r++){
@@ -2055,6 +2065,8 @@ function getCellOverflowMap(canvas, col_st, col_ed, row_st, row_end){
         }
     }
 
+    Store.cellOverflowMapCache = map;
+
     return map;
 }
 

src/global/method.js

@@ -135,6 +135,8 @@ const defaultConfig = {
         measureTextCache:{},
         measureTextCellInfoCache:{},
         measureTextCacheTimeOut:null,
+        borderInfoCache:null,
+        cellOverflowMapCache:null,
     
         zoomRatio:1,
     

src/store/index.js

@@ -119,6 +119,8 @@ const Store = {
     measureTextCache:{},
     measureTextCellInfoCache:{},
     measureTextCacheTimeOut:null,
+    borderInfoCache:null,
+    cellOverflowMapCache:null,
 
     zoomRatio:1,