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fonts: Measure more FontContext heap usage. (#38733)

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Replace a hand-written MallocSizeOf implementation with an automatically
derived one. This exposes more than 1MB of previously-untracked heap
data on servo.org.

Testing: Compared about:memory output for servo.org before and after.
Part of: #11559

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-08-17 14:59:30 -04:00 • committed by GitHub
parent d490c5c06b
commit 9da8142e2a
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8 changed files with 59 additions and 32 deletions
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5
components/fonts/lib.rs
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@ -22,6 +22,7 @@ pub use font_store::*;
pub use font_template::*;
pub use glyph::*;
use ipc_channel::ipc::IpcSharedMemory;
use malloc_size_of_derive::MallocSizeOf;
pub use platform::LocalFontIdentifier;
pub use shaper::*;
pub use system_font_service::*;
@ -30,8 +31,8 @@ use unicode_properties::{EmojiStatus, UnicodeEmoji, emoji};
/// A data structure to store data for fonts. Data is stored internally in an
/// [`IpcSharedMemory`] handle, so that it can be send without serialization
/// across IPC channels.
#[derive(Clone)]
pub struct FontData(pub(crate) Arc<IpcSharedMemory>);
#[derive(Clone, MallocSizeOf)]
pub struct FontData(#[conditional_malloc_size_of] pub(crate) Arc<IpcSharedMemory>);
impl FontData {
pub fn from_bytes(bytes: &[u8]) -> Self {