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Optimizing performance of _BinaryWriter._resizeBuffer #13456

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Jan 20, 2023
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Optimizing performance of _BinaryWriter._resizeBuffer #13456

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7 changes: 3 additions & 4 deletions packages/dev/serializers/src/glTF/2.0/glTFExporter.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2344,11 +2344,10 @@ export class _BinaryWriter {
*/
private _resizeBuffer(byteLength: number): ArrayBuffer {
const newBuffer = new ArrayBuffer(byteLength);
const oldUint8Array = new Uint8Array(this._arrayBuffer);
const copyOldBufferSize = Math.min(this._arrayBuffer.byteLength, byteLength);
const oldUint8Array = new Uint8Array(this._arrayBuffer, 0, copyOldBufferSize);
const newUint8Array = new Uint8Array(newBuffer);
for (let i = 0, length = newUint8Array.byteLength; i < length; ++i) {
newUint8Array[i] = oldUint8Array[i];
}
newUint8Array.set(oldUint8Array, 0);
this._arrayBuffer = newBuffer;
this._dataView = new DataView(this._arrayBuffer);

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