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style: Process all the MediumFeatureChanges at the same time.

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This avoids resetting the computed values all the time, and paves the way to
avoid using a StyleSet on XBL bindings / Shadow DOM, which we should really
really do because it's super overkill.

There are some XBL bits that are kind of hacky, in particular the mStylistDirty,
but they'll go away soon, since I want to redo how we store styles in XBL.

The alternative, which was returning an array of indices or something was even
more hacky I think.

Bug: 1435939
Reviewed-by: xidorn
MozReview-Commit-ID: 6tEl5gebXVF
This commit is contained in:
Emilio Cobos Álvarez 2018-02-06 16:52:22 +01:00
parent 9324feb994
commit 0907c21600
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GPG key ID: 056B727BB9C1027C
2 changed files with 58 additions and 43 deletions
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17
components/style/stylist.rs
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@ -1089,9 +1089,6 @@ impl Stylist {
///
/// Also, the device that arrives here may need to take the viewport rules
/// into account.
///
/// For Gecko, this is called when XBL bindings are used by different
/// documents.
pub fn set_device(
&mut self,
mut device: Device,
@ -1119,14 +1116,22 @@ impl Stylist {
}
self.device = device;
self.media_features_change_changed_style(guards)
self.media_features_change_changed_style(guards, &self.device)
}
/// Returns whether, given a media feature change, any previously-applicable
/// style has become non-applicable, or vice-versa for each origin.
/// style has become non-applicable, or vice-versa for each origin, using
/// `device`.
///
/// Passing `device` is needed because this is used for XBL in Gecko, which
/// can be stale in various ways, so we need to pass the device of the
/// document itself, which is what is kept up-to-date.
///
/// Arguably XBL should use something more lightweight than a Stylist.
pub fn media_features_change_changed_style(
&self,
guards: &StylesheetGuards,
device: &Device,
) -> OriginSet {
debug!("Stylist::media_features_change_changed_style");
@ -1145,7 +1150,7 @@ impl Stylist {
let affected_changed = !origin_cascade_data.media_feature_affected_matches(
stylesheet,
guard,
&self.device,
device,
self.quirks_mode
);