The script should decide when an image diff passes, not ImageDiff

[Simon Fraser (smfr)]

Currently the ImageDiff binary determines when an image diff passes (diff is less than the tolerance), but it makes more sense for webkitpy to make that decision.

[Simon Fraser (smfr)]

Created attachment 442462 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 442462 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=442462&action=review

> Tools/ChangeLog:3
> +        The script should decide when an image diff cases, not ImageDiff

passes, not cases

[Martin Robinson]

Comment on attachment 442462 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=442462&action=review

This is a nice change.

> Tools/ImageDiff/ImageDiff.cpp:71
> +    fprintf(stdout, "diff: %01.8f%%\n", differenceData.percentageDifference);

This is a nice simplification.

> Tools/Scripts/webkitpy/port/image_diff.py:137
> +            return ImageDiffResult(passed=False, diff_image=None, difference=0, tolerance=self._tolerance, error_string=err_str or "Failed to match ImageDiff output %s" % diff_output)

I think using 

   "Failed to match ImageDiff output {}".format(diff_output)

would be better for future-proofing this code against changes to Python.

[EWS]

Committed r284878 (243555@main): <https://commits.webkit.org/243555@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 442462 [details].

[Radar WebKit Bug Importer]

<rdar://problem/84670441>