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fonts: Add FontIdentifier and LocalFontIdentifier (#31658)

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Instead of using a simple `Atom` to identify a local font, use a data
structure. This allows us to carry more information necessary to
identify a local font (such as a path on MacOS). We need this for the
new version of WebRender, as fonts on MacOS now require a path.

This has a lot of benefits:
 1. We can avoid loading fonts without paths on MacOS, which should
    avoid a lot of problems with flakiness and ensure we always load the
    same font for a given identifier.
 2. This clarifies the difference between web fonts and local fonts,
    though there is more work to do here.
 3. This avoid a *lot* of font shenanigans, such as trying to work
    backwards from the name of the font to the path of the font we
    actually matched. In general, we can remove a lot of code trying to
    accomplish these shenanigans.
 4. Getting the font bytes always returns an `Arc` now avoiding an extra
    full font copy in the case of Canvas.
This commit is contained in:
Martin Robinson 2024-03-14 12:31:00 +01:00 • committed by GitHub
parent b1debf2068
commit e5fbb3d487
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17 changed files with 365 additions and 320 deletions
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6
components/layout/text.rs
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@ -11,12 +11,12 @@ use std::sync::Arc;
use app_units::Au;
use gfx::font::{self, FontMetrics, FontRef, RunMetrics, ShapingFlags, ShapingOptions};
use gfx::font_cache_thread::FontIdentifier;
use gfx::text::glyph::ByteIndex;
use gfx::text::text_run::TextRun;
use gfx::text::util::{self, CompressionMode};
use log::{debug, warn};
use range::Range;
use servo_atoms::Atom;
use style::computed_values::text_rendering::T as TextRendering;
use style::computed_values::white_space::T as WhiteSpace;
use style::computed_values::word_break::T as WordBreak;
@ -665,10 +665,10 @@ impl RunInfo {
}
fn has_font(&self, font: &Option<FontRef>) -> bool {
fn identifier_and_pt_size(font: &Option<FontRef>) -> Option<(Atom, Au)> {
fn identifier_and_pt_size(font: &Option<FontRef>) -> Option<(FontIdentifier, Au)> {
font.as_ref().map(|font| {
let font = font.borrow();
(font.identifier(), font.descriptor.pt_size)
(font.identifier().clone(), font.descriptor.pt_size)
})
}