Function canvasToBlobUrl

src/hooks/useThumbnail.ts:15–33

* Process canvas to blob URL for thumbnails.

(canvas: HTMLCanvasElement | OffscreenCanvas)

 * Process canvas to blob URL for thumbnails.
 */
async function canvasToBlobUrl(canvas: HTMLCanvasElement | OffscreenCanvas): Promise<string | null> {
  return new Promise((resolve) => {
    if (isOffscreenCanvas(canvas)) {
      canvas.convertToBlob({ type: 'image/jpeg', quality: 0.75 }).then((blob) => {
        resolve(URL.createObjectURL(blob));
      }).catch(() => {
        resolve(null);
      });
    } else {
      canvas.toBlob((blob) => {
        if (blob) {
          resolve(URL.createObjectURL(blob));
        } else {
          resolve(null);
        }
      }, 'image/jpeg', 0.75);
    }
  });
}

// Create the thumbnail cache instance
const thumbnailCache = createImageCache<string>({