Commits on Jun 4, 2022

1. Convert ImageBitmap => ImageData on the main thread in all browsers …

   Chrome has a bug where image orientation metadata in JPEG images is lost
   when an ImageBitmap is cloned via a structured clone [1]. Therefore we have
   to do ImageBitmap => ImageData conversion on the main thread to ensure
   that the OCR engine receives decoded image data which respects the image
   orientation.
   
   Prior to this fix the rendered image orientation and the OCR output did
   not match up in Chrome if the input image was rotated.
   
   Since neither Firefox nor Safari support OffscreenCanvas, this means
   that all browsers are now doing ImageBitmap => ImageData conversion on
   the main thread.
   
   Fixes #35
   
   [1] https://bugs.chromium.org/p/chromium/issues/detail?id=1332947

   

   robertknight committed Jun 4, 2022
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