1852861 - Bottom of letter is clipped when vertical writing-mode and negative letter-spacing are set

Status: NEW

(Core :: Graphics: Text, defect)

Description

[:sharapeco]

Attachment: letter-spacing-bug.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/117.0

Steps to reproduce:

HTML:

<p class="vert">
	<span class="ls-20">レ</span
		><span class="ls-20">タ</span
		><span class="ls-20">ー</span
		>...
</p>

and CSS:

.vert { writing-mode: vertical-rl; }
.ls-20 { letter-spacing: -.2em; }

Actual results:

Bottom of letter is clipped like attached image.

Expected results:

Whole letters are visible (correct when horizontal writing-mode).

Comment 1

[Alice0775 White]

Attachment: Reporter'sTestCase.html

Comment 2

[Alice0775 White]

Regression window:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=dd0f265a130098cda83a0c25c7617d2365b28f2d&tochange=083a9c84fbd09a6ff9bfecabbf773650842fe1c0

Suspect:
4558b0224f93da51967202c3bb988176352c9e7d Jonathan Kew — Bug 1412355 - Replace the mXOffset/mYOffset fields in DetailedGlyph records with a gfx::Point that stores glyph offsets in line-orientation-relative coordinates. r=jrmuizel

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1412355

:jfkthame, since you are the author of the regressor, bug 1412355, could you take a look? Also, could you set the severity field?

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