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fonts: Use IpcSharedMemory to send font data (#33530)

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This changes modifes the way that font data is sent over IPC channels.
Instead of serializing the data or sending it via IPC byte senders, font
data is copied into shared memory and a copy of the handle is sent over
the channel.

There is also the idea of sending the file handle of the on disk data of
system fonts. This could be implemented as a further followup once there
is an abstraction in `ipc-channel` over file handles.

To accomplish this, a `FontData` abstraction is added, which also allows
caching an in-memory shared `Arc<Vec<u8>>` version of the data (neeeded
by some APIs). This could also be a place for caching font tables in the
future.

Finally, the `FontCacheThread` is renamed to the `SystemFontService`
while the proxy for this is now named `SystemFontServiceProxy`.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>
This commit is contained in:
Martin Robinson 2024-09-25 09:31:55 +02:00 • committed by GitHub
parent 2c6d9a190f
commit ade902207f
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GPG key ID: B5690EEEBB952194
26 changed files with 601 additions and 544 deletions
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16
components/script/script_thread.rs
View file

@ -48,7 +48,7 @@ use devtools_traits::{
};
use embedder_traits::EmbedderMsg;
use euclid::default::{Point2D, Rect};
use fonts::FontCacheThread;
use fonts::SystemFontServiceProxy;
use headers::{HeaderMapExt, LastModified, ReferrerPolicy as ReferrerPolicyHeader};
use html5ever::{local_name, namespace_url, ns};
use hyper_serde::Serde;
@ -593,9 +593,9 @@ pub struct ScriptThread {
#[no_trace]
layout_to_constellation_chan: IpcSender<LayoutMsg>,
/// The font cache thread to use for layout that happens in this [`ScriptThread`].
/// A proxy to the `SystemFontService` to use for accessing system font lists.
#[no_trace]
font_cache_thread: FontCacheThread,
system_font_service: Arc<SystemFontServiceProxy>,
/// The port on which we receive messages from the image cache
#[no_trace]
@ -786,7 +786,7 @@ impl ScriptThreadFactory for ScriptThread {
fn create(
state: InitialScriptState,
layout_factory: Arc<dyn LayoutFactory>,
font_cache_thread: FontCacheThread,
system_font_service: Arc<SystemFontServiceProxy>,
load_data: LoadData,
user_agent: Cow<'static, str>,
) {
@ -813,7 +813,7 @@ impl ScriptThreadFactory for ScriptThread {
script_port,
script_chan.clone(),
layout_factory,
font_cache_thread,
system_font_service,
user_agent,
);
@ -1282,7 +1282,7 @@ impl ScriptThread {
port: Receiver<MainThreadScriptMsg>,
chan: Sender<MainThreadScriptMsg>,
layout_factory: Arc<dyn LayoutFactory>,
font_cache_thread: FontCacheThread,
system_font_service: Arc<SystemFontServiceProxy>,
user_agent: Cow<'static, str>,
) -> ScriptThread {
let opts = opts::get();
@ -1387,7 +1387,7 @@ impl ScriptThread {
mutation_observers: Default::default(),
layout_to_constellation_chan: state.layout_to_constellation_chan,
font_cache_thread,
system_font_service,
webgl_chan: state.webgl_chan,
webxr_registry: state.webxr_registry,
@ -3657,7 +3657,7 @@ impl ScriptThread {
constellation_chan: self.layout_to_constellation_chan.clone(),
script_chan: self.control_chan.clone(),
image_cache: self.image_cache.clone(),
font_cache_thread: self.font_cache_thread.clone(),
system_font_service: self.system_font_service.clone(),
resource_threads: self.resource_threads.clone(),
time_profiler_chan: self.time_profiler_chan.clone(),
webrender_api_sender: self.webrender_api_sender.clone(),