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6c3458767b
This commit itself only moves things around and adds an extra parameter to the `apply_declarations` function to eventually handle #14079 correctly. Probably needs a more granular API to query fonts, á la nsFontMetrics, but that's trivial to do once this is landed. Then we should make the font provider mandatory, and implement the missing stylo bits.
35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use Atom;
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use app_units::Au;
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use euclid::Size2D;
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use std::fmt;
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/// Represents the font metrics that style needs from a font to compute the
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/// value of certain CSS units like `ex`.
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#[derive(Debug, PartialEq, Clone)]
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pub struct FontMetrics {
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pub x_height: Au,
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pub zero_advance_measure: Size2D<Au>,
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}
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#[derive(Debug, PartialEq, Clone)]
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pub enum FontMetricsQueryResult {
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Available(Option<FontMetrics>),
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NotAvailable,
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}
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/// A trait used to represent something capable of providing us font metrics.
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pub trait FontMetricsProvider: Send + Sync + fmt::Debug {
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/// Obtain the metrics for given font family.
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///
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/// TODO: We could make this take the full list, I guess, and save a few
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/// virtual calls.
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///
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/// This is not too common in practice though.
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fn query(&self, _font_name: &Atom) -> FontMetricsQueryResult {
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FontMetricsQueryResult::NotAvailable
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}
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}
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