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Add support for the 'cap' font-relative unit

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This is a backport of https://phabricator.services.mozilla.com/D133101,
by Jonathan Kew.

Note that Servo isn't using font metrics yet, so the unit still won't
really work.
This commit is contained in:
Oriol Brufau 2023-05-10 02:26:00 +02:00
parent 61f872e7da
commit 6785c57c78
5 changed files with 68 additions and 8 deletions
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13
components/style/gecko/wrapper.rs
View file

@ -979,7 +979,12 @@ impl FontMetricsProvider for GeckoFontMetricsProvider {
};
let vertical_metrics = match orientation {
FontMetricsOrientation::MatchContext => wm.is_vertical() && wm.is_upright(),
FontMetricsOrientation::MatchContextPreferHorizontal => {
wm.is_vertical() && wm.is_upright()
},
FontMetricsOrientation::MatchContextPreferVertical => {
wm.is_vertical() && !wm.is_sideways()
},
FontMetricsOrientation::Horizontal => false,
};
let gecko_metrics = unsafe {
@ -999,6 +1004,12 @@ impl FontMetricsProvider for GeckoFontMetricsProvider {
} else {
None
},
cap_height: if gecko_metrics.mCapHeight.px() >= 0. {
Some(gecko_metrics.mCapHeight)
} else {
None
},
ascent: gecko_metrics.mAscent,
}
}
}