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fonts: Simplify FontContext in two ways that affect the unit test (#33541)

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This is done by no longer forwarding compositor-bound messages through
SystemFontService and making `FontContext` non-generic:

- Messages from the `FontContext` to the `Compositor` no longer need to be
  forwarded through the `SystemFontService`. Instead send these messages
  directly through the script IPC channel to the `Compositor`.

- Instead of adding a mock `SystemFontServiceProxy`, simply implement a
  mock `SystemFontService` on the other side of an IPC channel in the
  `font_context` unit test. This allows making `FontContext`
  non-generic, greatly simplifying the code. The extra complexity moves
  into the unit test.

These changes necessitate adding a new kind of `FontIdentifier`,
`FontIdentifier::Mock` due to the fact that local fonts have
platform-specific identifiers. This avoids having to pretend like the
system font service can have web fonts -- which was always a bit of a
hack.

These two changes are combined into one PR because they both require
extensive and similar chages in the font_context unit test which
dependended on the details of both of them.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2024-09-25 22:15:47 +02:00 • committed by GitHub
parent 1daa0b4fc7
commit ac567645a7
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25 changed files with 482 additions and 425 deletions
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34
components/shared/webrender/lib.rs
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@ -192,24 +192,6 @@ pub trait WebRenderFontApi {
) -> FontInstanceKey;
fn add_font(&self, data: Arc<IpcSharedMemory>, index: u32) -> FontKey;
fn add_system_font(&self, handle: NativeFontHandle) -> FontKey;
/// Forward a `AddFont` message, sending it on to the compositor. This is used to get WebRender
/// [`FontKey`]s for web fonts in the per-layout `FontContext`.
fn forward_add_font_message(
&self,
data: Arc<IpcSharedMemory>,
font_index: u32,
result_sender: IpcSender<FontKey>,
);
/// Forward a `AddFontInstance` message, sending it on to the compositor. This is used to get
/// WebRender [`FontInstanceKey`]s for web fonts in the per-layout `FontContext`.
fn forward_add_font_instance_message(
&self,
font_key: FontKey,
size: f32,
flags: FontInstanceFlags,
result_receiver: IpcSender<FontInstanceKey>,
);
}
pub enum CanvasToCompositorMsg {
@ -260,6 +242,8 @@ pub enum ScriptToCompositorMsg {
UpdateImages(Vec<SerializedImageUpdate>),
/// Remove the given font resources from our WebRender instance.
RemoveFonts(Vec<FontKey>, Vec<FontInstanceKey>),
AddFontInstance(FontKey, f32, FontInstanceFlags, IpcSender<FontInstanceKey>),
AddFont(Arc<IpcSharedMemory>, u32, IpcSender<FontKey>),
}
/// A mechanism to send messages from networking to the WebRender instance.
@ -294,11 +278,23 @@ impl WebRenderNetApi {
pub struct WebRenderScriptApi(IpcSender<ScriptToCompositorMsg>);
impl WebRenderScriptApi {
/// Create a new WebrenderIpcSender object that wraps the provided channel sender.
/// Create a new [`WebRenderScriptApi`] object that wraps the provided channel sender.
pub fn new(sender: IpcSender<ScriptToCompositorMsg>) -> Self {
Self(sender)
}
/// Create a new [`WebRenderScriptApi`] object that does not have a listener on the
/// other end.
pub fn dummy() -> Self {
let (sender, _) = ipc::channel().unwrap();
Self::new(sender)
}
/// Get the sender for this proxy.
pub fn sender(&self) -> &IpcSender<ScriptToCompositorMsg> {
&self.0
}
/// Inform WebRender of the existence of this pipeline.
pub fn send_initial_transaction(&self, pipeline: WebRenderPipelineId) {
if let Err(e) = self