start static method

PdfRenderWorker start(Uint8List bytes)

Starts the platform's worker over bytes (the document image the page indices passed to record refer to). Native: a long-lived background isolate that opens its own PdfDocument. Web: a Web Worker over the script at pdfRenderWorkerScriptUrl when one is configured (by default the bundled package asset, else a null worker). Platforms without either: a null worker whose record always defers to local rendering.

With pdfRenderWorkerPoolSize > 1 the backend is a PdfPooledRenderWorker that fans page records across that many platform workers, so a raster-heavy document warms ~N× faster (see that class). Default 3 enables a small pool; set it to 1 for the historical single-worker path.

The backend is wrapped in a PdfCachingRenderWorker so a page the lazy list recycles and rebuilds is served from cache instead of being re-decoded from scratch (see that class), and concurrent requests for one page share a single decode. The cache wraps the whole pool, so it is shared across every worker and is fresh for each document.

Implementation

static PdfRenderWorker start(Uint8List bytes) =>
    PdfCachingRenderWorker(_backend(bytes));