Feature [feature-requests:#1370] Implement SCI_ALLOCATELINES to allocate indices

to hold some number of lines. This is an optimization that can decrease
reallocation overhead.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/CellBuffer.cxx b/src/CellBuffer.cxx
index f02d5348a..d94ffaaea 100644
--- a/src/CellBuffer.cxx
+++ b/src/CellBuffer.cxx
@@ -71,6 +71,7 @@ public:
 	virtual void SetLineStart(Sci::Line line, Sci::Position position) noexcept = 0;
 	virtual void RemoveLine(Sci::Line line) = 0;
 	virtual Sci::Line Lines() const noexcept = 0;
+	virtual void AllocateLines(Sci::Line lines) = 0;
 	virtual Sci::Line LineFromPosition(Sci::Position pos) const noexcept = 0;
 	virtual Sci::Position LineStart(Sci::Line line) const noexcept = 0;
 	virtual void InsertCharacters(Sci::Line line, CountWidths delta) noexcept = 0;
@@ -132,6 +133,11 @@ public:
 		const Sci::Position widthCurrent = LineWidth(line);
 		starts.InsertText(static_cast<POS>(line), static_cast<POS>(width - widthCurrent));
 	}
+	void AllocateLines(Sci::Line lines) {
+		if (lines > starts.Partitions()) {
+			starts.ReAllocate(lines);
+		}
+	}
 	void InsertLines(Sci::Line line, Sci::Line lines) {
 		// Insert multiple lines with each temporarily 1 character wide.
 		// The line widths will be fixed up by later measuring code.
@@ -237,6 +243,17 @@ public:
 	Sci::Line Lines() const noexcept override {
 		return static_cast<Sci::Line>(starts.Partitions());
 	}
+	void AllocateLines(Sci::Line lines) override {
+		if (lines > Lines()) {
+			starts.ReAllocate(lines);
+			if (FlagSet(activeIndices, LineCharacterIndexType::Utf32)) {
+				startsUTF32.AllocateLines(lines);
+			}
+			if (FlagSet(activeIndices, LineCharacterIndexType::Utf16)) {
+				startsUTF16.AllocateLines(lines);
+			}
+		}
+	}
 	Sci::Line LineFromPosition(Sci::Position pos) const noexcept override {
 		return static_cast<Sci::Line>(starts.PartitionFromPosition(static_cast<POS>(pos)));
 	}
@@ -789,6 +806,10 @@ Sci::Line CellBuffer::Lines() const noexcept {
 	return plv->Lines();
 }
 
+void CellBuffer::AllocateLines(Sci::Line lines) {
+	plv->AllocateLines(lines);
+}
+
 Sci::Position CellBuffer::LineStart(Sci::Line line) const noexcept {
 	if (line < 0)
 		return 0;
@@ -903,7 +924,9 @@ bool CellBuffer::UTF8IsCharacterBoundary(Sci::Position position) const {
 
 void CellBuffer::ResetLineEnds() {
 	// Reinitialize line data -- too much work to preserve
+	const Sci::Line lines = plv->Lines();
 	plv->Init();
+	plv->AllocateLines(lines);
 
 	constexpr Sci::Position position = 0;
 	const Sci::Position length = Length();