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style: Keep track of whether a style is affected by font metrics.

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Differential Revision: https://phabricator.services.mozilla.com/D20728
This commit is contained in:
Emilio Cobos Álvarez 2019-03-19 21:10:13 +00:00
parent fe7b3a6b11
commit ed4a23eccf
4 changed files with 47 additions and 34 deletions
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3
components/style/values/specified/length.rs
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@ -9,6 +9,7 @@
use super::{AllowQuirks, Number, Percentage, ToComputedValue};
use crate::font_metrics::FontMetricsQueryResult;
use crate::parser::{Parse, ParserContext};
use crate::properties::computed_value_flags::ComputedValueFlags;
use crate::values::computed::{self, CSSPixelLength, Context};
use crate::values::generics::length as generics;
use crate::values::generics::length::{
@ -158,6 +159,7 @@ impl FontRelativeLength {
if context.for_non_inherited_property.is_some() {
context.rule_cache_conditions.borrow_mut().set_uncacheable();
}
context.builder.add_flags(ComputedValueFlags::DEPENDS_ON_FONT_METRICS);
let reference_size = match query_font_metrics(context, base_size) {
FontMetricsQueryResult::Available(metrics) => metrics.x_height,
// https://drafts.csswg.org/css-values/#ex
@ -174,6 +176,7 @@ impl FontRelativeLength {
if context.for_non_inherited_property.is_some() {
context.rule_cache_conditions.borrow_mut().set_uncacheable();
}
context.builder.add_flags(ComputedValueFlags::DEPENDS_ON_FONT_METRICS);
let reference_size = match query_font_metrics(context, base_size) {
FontMetricsQueryResult::Available(metrics) => metrics.zero_advance_measure,
// https://drafts.csswg.org/css-values/#ch