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style: Fix font loading invalidation to account for metrics coming from the parent style.

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We were only looking at the given frame's style, which is not
sufficient for this case.

Differential Revision: https://phabricator.services.mozilla.com/D96237
This commit is contained in:
Emilio Cobos Álvarez 2020-11-06 22:30:28 +00:00
parent bdbe8fde42
commit 42abdb99c4
2 changed files with 18 additions and 13 deletions
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19
components/style/properties/computed_value_flags.rs
View file

@ -57,19 +57,24 @@ bitflags! {
/// Whether the child explicitly inherits any reset property.
const INHERITS_RESET_STYLE = 1 << 8;
/// Whether any value on our style is font-metric-dependent.
const DEPENDS_ON_FONT_METRICS = 1 << 9;
/// Whether any value on our style is font-metric-dependent on our
/// primary font.
const DEPENDS_ON_SELF_FONT_METRICS = 1 << 9;
/// Whether any value on our style is font-metric-dependent on the
/// primary font of our parent.
const DEPENDS_ON_INHERITED_FONT_METRICS = 1 << 10;
/// Whether the style or any of the ancestors has a multicol style.
///
/// Only used in Servo.
const CAN_BE_FRAGMENTED = 1 << 10;
const CAN_BE_FRAGMENTED = 1 << 11;
/// Whether this style is the style of the document element.
const IS_ROOT_ELEMENT_STYLE = 1 << 11;
const IS_ROOT_ELEMENT_STYLE = 1 << 12;
/// Whether this element is inside an `opacity: 0` subtree.
const IS_IN_OPACITY_ZERO_SUBTREE = 1 << 12;
const IS_IN_OPACITY_ZERO_SUBTREE = 1 << 13;
/// Whether there are author-specified rules for border-* properties
/// (except border-image-*), background-color, or background-image.
@ -77,13 +82,13 @@ bitflags! {
/// TODO(emilio): Maybe do include border-image, see:
///
/// https://github.com/w3c/csswg-drafts/issues/4777#issuecomment-604424845
const HAS_AUTHOR_SPECIFIED_BORDER_BACKGROUND = 1 << 13;
const HAS_AUTHOR_SPECIFIED_BORDER_BACKGROUND = 1 << 14;
/// Whether there are author-specified rules for padding-* properties.
///
/// FIXME(emilio): Try to merge this with BORDER_BACKGROUND, see
/// https://github.com/w3c/csswg-drafts/issues/4777
const HAS_AUTHOR_SPECIFIED_PADDING = 1 << 14;
const HAS_AUTHOR_SPECIFIED_PADDING = 1 << 15;
}
}

12
components/style/values/specified/length.rs
View file

@ -161,6 +161,10 @@ impl FontRelativeLength {
}
let reference_font_size = base_size.resolve(context);
let font_metrics_flag = match base_size {
FontBaseSize::CurrentStyle => ComputedValueFlags::DEPENDS_ON_SELF_FONT_METRICS,
FontBaseSize::InheritedStyle => ComputedValueFlags::DEPENDS_ON_INHERITED_FONT_METRICS,
};
match *self {
FontRelativeLength::Em(length) => {
if context.for_non_inherited_property.is_some() {
@ -178,9 +182,7 @@ 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);
context.builder.add_flags(font_metrics_flag);
// The x-height is an intrinsically horizontal metric.
let metrics =
query_font_metrics(context, base_size, FontMetricsOrientation::Horizontal);
@ -199,9 +201,7 @@ 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);
context.builder.add_flags(font_metrics_flag);
// https://drafts.csswg.org/css-values/#ch:
//
// Equal to the used advance measure of the “0” (ZERO,