From 4787744645840965171ec89777f2f1a615005391 Mon Sep 17 00:00:00 2001
From: nightwing <amirjanyan@gmail.com>
Date: Sat, 21 May 2011 18:35:59 +0500
Subject: [PATCH] faster documentToScreenPosition

---
 lib/ace/edit_session.js         | 40 +++++++++++++++++----------------
 lib/ace/edit_session/folding.js |  1 -
 lib/ace/layer/text.js           |  2 +-
 3 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/lib/ace/edit_session.js b/lib/ace/edit_session.js
index 606121e9..4313e934 100644
--- a/lib/ace/edit_session.js
+++ b/lib/ace/edit_session.js
@@ -1503,7 +1503,6 @@ var EditSession = function(text, mode) {
         }
 
         var wrapData;
-
         // Special case in wrapMode if the doc is at the end of the document.
         if (this.$useWrapMode) {
             wrapData = this.$wrapData;
@@ -1517,13 +1516,10 @@ var EditSession = function(text, mode) {
             }
         }
 
-        var screenRow = 0,
-            screenColumn = 0,
-            foldStartRow = null,
-            fold = null,
-            folds,
-            comp,
-            foldLine = null;
+        var screenRow = 0;
+        var screenColumn = 0;
+        var foldStartRow = null;
+        var fold = null;
 
         // Clamp the docRow position in case it's inside of a folded block.
         fold = this.getFoldAt(docRow, docColumn, 1);
@@ -1545,7 +1541,19 @@ var EditSession = function(text, mode) {
         }
         var docRowCacheLast = row;
 
+        var foldLine = this.getNextFold(row);
+        var foldStart = foldLine ?foldLine.start.row :Infinity;
+
         while (row < docRow) {
+            if (row >= foldStart) {
+                rowEnd = foldLine.end.row + 1;
+                if (rowEnd > docRow)
+                    break;
+                foldLine = this.getNextFold(rowEnd);
+                foldStart = foldLine ?foldLine.start.row :Infinity;
+            } else {
+                rowEnd = row + 1;
+            }
             if (doCache
                 && row - docRowCacheLast > this.$rowCacheSize) {
                 rowCache.push({
@@ -1555,26 +1563,20 @@ var EditSession = function(text, mode) {
                 docRowCacheLast = row;
             }
 
-            rowEnd = this.getRowFoldEnd(row);
-            if (rowEnd >= docRow) {
-                break;
-            }
             screenRow += this.getRowLength(row);
-            row = rowEnd + 1;
+            row = rowEnd;
         }
 
         // Calculate the text line that is displayed in docRow on the screen.
         var textLine = "";
-        foldLine = this.getFoldLine(docRow);
         // Check if the final row we want to reach is inside of a fold.
-        if (!foldLine) {
-            textLine = this.getLine(docRow).substring(0, docColumn);
-            foldStartRow = docRow;
-        } else {
+        if (foldLine && row >= foldStart) {
             textLine = this.getFoldDisplayLine(foldLine, docRow, docColumn);
             foldStartRow = foldLine.start.row;
+        } else {
+            textLine = this.getLine(docRow).substring(0, docColumn);
+            foldStartRow = docRow;
         }
-
         // Clamp textLine if in wrapMode.
         if (this.$useWrapMode) {
             var wrapRow = wrapData[foldStartRow];
diff --git a/lib/ace/edit_session/folding.js b/lib/ace/edit_session/folding.js
index 904e0fb5..9a19575c 100644
--- a/lib/ace/edit_session/folding.js
+++ b/lib/ace/edit_session/folding.js
@@ -489,7 +489,6 @@ function Folding() {
     };
 
     this.getRowFoldEnd = function(docRow, startFoldRow) {
-        //console.trace()
         var foldLine = this.getFoldLine(docRow, startFoldRow);
         return (foldLine
                     ? foldLine.end.row
diff --git a/lib/ace/layer/text.js b/lib/ace/layer/text.js
index 88a4e1bf..bd186433 100644
--- a/lib/ace/layer/text.js
+++ b/lib/ace/layer/text.js
@@ -513,7 +513,7 @@ var Text = function(parentEl) {
         }.bind(this), foldLine.end.row, this.session.getLine(foldLine.end.row).length);
 
         // TODO: Build a fake splits array!
-        var splits = this.session.$wrapData[row];
+        var splits = this.session.$useWrapMode?this.session.$wrapData[row]:null;
         this.$renderLineCore(stringBuilder, row, renderTokens, splits);
     };