Powei Feng cd22478e4f renderdiff: add viewer for image differences (#8768) ...

- Modify the compare script to output more details of a
   comparison. This will include the source/golden directory,
   the comparison directory (the new renderings), and a file
   path to difference images if the golden does not match
   the rendered image.
 - The image_diff script can now output a TIFF that is the
   difference of two input TIFFs.
 - Add a viewer for examining the differences between rendered
   output and golden images.
 - The viewer consists of a simple server of web API endpoints
   for querying difference results (along with rendered images
   in TIFF).
 - And a web-based (html + lit-element) UI for looking at the
   rendered images and differences.

2025-06-02 19:37:46 +00:00

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