Daniel Holbert 7b74fdf230 Bug 1819467 part 1: Move bounds of red shape inwards by 1px in several SVG WPTs that have transformed green shape covering a red shape. r=layout-reviewers,jfkthame ...

In these tests, the bounds of the red shape were technically already 1px
inwards from the bounds of the green shape (at the vertices at least), but that
still seems to create an opportunity for a little bit of red fringe along
antialiased diagonal lines.  An additional pixel of "buffer" is sufficient to
avoid this fuzzy mismatch, since it ensures that the edge of the red shape is
at least a pixel inwards from the edge of the green shape along the whole
diagonal.

With that change, there are some remaining visually-imperceptible
(maxDifference of 1 in the green channel) fuzzy pixels. These ones are
unrelated to the red shape, and I'm adding annotations for them since they're
imperceptible and unrelated to what the test is trying to test.

We've got https://bugzilla.mozilla.org/show_bug.cgi?id=1840747 to track the
former issue (the red fringe), and we have
https://bugzilla.mozilla.org/show_bug.cgi?id=1840511 to track the latter issue
(off-by-1 in the green color channel).

Depends on D182295

Differential Revision: https://phabricator.services.mozilla.com/D182296

2023-07-01 07:55:32 +00:00

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