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Cache work cell in hot loops

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This commit is contained in:
Daniel Imms
2026-01-31 10:26:15 -08:00
parent 8eed7b4163
commit 3ef43aedb1
2 changed files with 6 additions and 5 deletions
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src/common/buffer/BufferLine.ts
+3 -4
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@@ -39,6 +39,7 @@ export const DEFAULT_ATTR_DATA = Object.freeze(new AttributeData());
// Work variables to avoid garbage collection
let $startIndex = 0;
const $workCell = new CellData();
/** Factor when to cleanup underlying array buffer after shrinking. */
const CLEANUP_THRESHOLD = 2;
@@ -262,9 +263,8 @@ export class BufferLine implements IBufferLine {
}
if (n < this.length - pos) {
const cell = new CellData();
for (let i = this.length - pos - n - 1; i >= 0; --i) {
this.setCell(pos + n + i, this.loadCell(pos + i, cell));
this.setCell(pos + n + i, this.loadCell(pos + i, $workCell));
}
for (let i = 0; i < n; ++i) {
this.setCell(pos + i, fillCellData);
@@ -284,9 +284,8 @@ export class BufferLine implements IBufferLine {
public deleteCells(pos: number, n: number, fillCellData: ICellData): void {
pos %= this.length;
if (n < this.length - pos) {
const cell = new CellData();
for (let i = 0; i < this.length - pos - n; ++i) {
this.setCell(pos + i, this.loadCell(pos + n + i, cell));
this.setCell(pos + i, this.loadCell(pos + n + i, $workCell));
}
for (let i = this.length - n; i < this.length; ++i) {
this.setCell(i, fillCellData);