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fonts: Make FontContext thread-safe and share it per-Layout (#32205)

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This allows sharing font templates, fonts, and platform fonts across
layout threads. It's the first step toward storing web fonts in the
layout versus the shared `FontCacheThread`. Now fonts and font groups
have some locking (especially on FreeType), which will probably affect
performance. On the other hand, we measured memory usage and this saves
roughly 40 megabytes of memory when loading servo.org based on data from
the memory profiler.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>
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Martin Robinson 2024-05-02 12:34:10 +02:00 • committed by GitHub
parent 8ec5344f70
commit 556bfb7dff
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27 changed files with 437 additions and 500 deletions
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7
components/gfx/platform/windows/font.rs
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@ -82,6 +82,13 @@ pub struct PlatformFont {
scaled_du_to_px: f32,
}
// Based on information from the Skia codebase, it seems that DirectWrite APIs from
// Windows 10 and beyond are thread safe. If problems arise from this, we can protect the
// platform font with a Mutex.
// See https://source.chromium.org/chromium/chromium/src/+/main:third_party/skia/src/ports/SkScalerContext_win_dw.cpp;l=56;bpv=0;bpt=1.
unsafe impl Sync for PlatformFont {}
unsafe impl Send for PlatformFont {}
struct Nondebug<T>(T);
impl<T> fmt::Debug for Nondebug<T> {