Changed LineVector to use an exponential allocation strategy which

minimises the memory allocated for short files but avoids excessive
copying for huge files. 23 Meg file load changes from 17 seconds to 3.

2 files changed, 4 insertions, 1 deletions

diff --git a/src/CellBuffer.cxx b/src/CellBuffer.cxx
index b67da81c9..420dee6ff 100644
--- a/src/CellBuffer.cxx
+++ b/src/CellBuffer.cxx
@@ -125,6 +125,7 @@ LineVector::LineVector() {
 	levels = 0;
 	sizeLevels = 0;
 	handleCurrent = 1;
+	growSize = 1000;
 
 	Init();
 }
@@ -199,6 +200,8 @@ void LineVector::ClearLevels() {
 void LineVector::InsertValue(int pos, int value) {
 	//Platform::DebugPrintf("InsertValue[%d] = %d\n", pos, value);
 	if ((lines + 2) >= size) {
+		if (growSize * 6 < size)
+			growSize *= 2;
 		Expand(size + growSize);
 		if (levels) {
 			ExpandLevels(size + growSize);
diff --git a/src/CellBuffer.h b/src/CellBuffer.h
index b5c90f57a..5cfcbfe1f 100644
--- a/src/CellBuffer.h
+++ b/src/CellBuffer.h
@@ -53,7 +53,7 @@ struct LineData {
  */
 class LineVector {
 public:
-	enum { growSize = 4000 };
+	int growSize;
 	int lines;
 	LineData *linesData;
 	int size;