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style: Experiment with implementing zoom as a transform + transform-origin shorthand.

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This is a gross hack, of course, but has the advantage of not breaking sites
that use both zoom and -moz-transform / -moz-transform-origin.

There should be no behavior change when the pref is off, of course, and the
webcompat team wanted to experiment with this.

Differential Revision: https://phabricator.services.mozilla.com/D49792
This commit is contained in:
Emilio Cobos Álvarez 2019-10-26 14:17:28 +00:00
parent ca05003ef6
commit 854c480177
7 changed files with 136 additions and 24 deletions
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23
components/style/values/specified/transform.rs
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@ -33,6 +33,27 @@ pub type TransformOrigin = generic::TransformOrigin<
Length,
>;
impl TransformOrigin {
/// Returns the initial specified value for `transform-origin`.
#[inline]
pub fn initial_value() -> Self {
Self::new(
OriginComponent::Length(LengthPercentage::Percentage(ComputedPercentage(0.5))),
OriginComponent::Length(LengthPercentage::Percentage(ComputedPercentage(0.5))),
Length::zero(),
)
}
/// Returns the `0 0` value.
pub fn zero_zero() -> Self {
Self::new(
OriginComponent::Length(LengthPercentage::zero()),
OriginComponent::Length(LengthPercentage::zero()),
Length::zero(),
)
}
}
impl Transform {
/// Internal parse function for deciding if we wish to accept prefixed values or not
///
@ -260,7 +281,7 @@ impl Parse for TransformOrigin {
let parse_depth = |input: &mut Parser| {
input
.try(|i| Length::parse(context, i))
.unwrap_or(Length::from_px(0.))
.unwrap_or(Length::zero())
};
match input.try(|i| OriginComponent::parse(context, i)) {
Ok(x_origin @ OriginComponent::Center) => {