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style: Add a StyleBuilder struct to avoid refcount and atomic CAS during the cascade.

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This should fix most of the complaints that caused
https://bugzilla.mozilla.org/show_bug.cgi?id=1360889 to be open, and also fix a
bunch of other FIXMEs across the style system.
This commit is contained in:
Emilio Cobos Álvarez 2017-04-30 13:59:10 +02:00
parent caa66a880a
commit 3b857f1c4e
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11 changed files with 279 additions and 120 deletions
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7
components/style/servo/media_queries.rs
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@ -11,7 +11,7 @@ use euclid::{Size2D, TypedSize2D};
use font_metrics::ServoMetricsProvider;
use media_queries::MediaType;
use parser::ParserContext;
use properties::ComputedValues;
use properties::{ComputedValues, StyleBuilder};
use std::fmt;
use style_traits::{CSSPixel, ToCss};
use style_traits::viewport::ViewportConstraints;
@ -185,14 +185,13 @@ impl Range<specified::Length> {
device: device,
inherited_style: default_values,
layout_parent_style: default_values,
// This cloning business is kind of dumb.... It's because Context
// insists on having an actual ComputedValues inside itself.
style: default_values.clone(),
style: StyleBuilder::for_derived_style(default_values),
// Servo doesn't support font metrics
// A real provider will be needed here once we do; since
// ch units can exist in media queries.
font_metrics_provider: &ServoMetricsProvider,
in_media_query: true,
cached_system_font: None,
quirks_mode: quirks_mode,
};