svs_web library

Web-only additions to package:svs, for working with slides larger than memory: BlobByteSource opens a slide straight from a browser File, and FileSystemWritableByteSink streams an export into one.

This library needs dart:js_interop, so only import it from code that is compiled for the web — behind a conditional import (if (dart.library.js_interop)) in an app that also targets other platforms.

Classes

BlobByteSource

A RandomAccessByteSource that reads a browser Blob — usually a File from an <input type="file"> or a drop event — one slice at a time, so a slide opened from it with SvsFile.openSource is never loaded into memory whole, however large it is.

FileSystemWritableByteSink

A RandomAccessByteSink that writes to a browser file through a FileSystemWritableFileStream, so an export streamed into it with e.g. exportSvsRegionAsSvsToSink goes to disk instead of memory, however large the output.