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Allow WebViews and fonts to have a RenderingGroupId. (#39140)

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Motivation: The font cache currently has to store a cache of Keys which
need to be given by the webrender instance.
Having a cache for every WebViewId in the future when we have every
webview have the different webrender::DocumentId might be too wasteful
to store this key cache per DocumentId. This proposes to include in the
WebViewId another id, the RenderingGroupId. This id can be easily
changed
to be equivalent to the DocumentId when we support multiple DocumentIds
for a unique Webrender instance.
Additionally this will keep it easier to integrate the currently out of
tree patches for multiple rendering contexts with different webrenders.


Change:
We introduce the RenderingGroupId in the WebViewId and allow a method to
extract it. The font key cache uses this cache
and forwards it to the Compositor when requesting new changes. The
compositor currently ignores this id.
Additionally, the WebView can return the RenderingGroupId. The WebViewId
also has an appropiate constructor for specifying a RenderingGroupId.
Because there currently will be only one RenderingGroupId the
performance will be minimal.


Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>

Testing: This should be covered by WPT tests and normal browsing
behavior works fine.

---------

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
This commit is contained in:
Narfinger 2025-09-29 12:01:56 +02:00 • committed by GitHub
parent 32b656adf4
commit e64f021550
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18 changed files with 240 additions and 63 deletions
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8
components/compositing/compositor.rs
View file

@ -14,7 +14,7 @@ use std::time::{SystemTime, UNIX_EPOCH};
use base::Epoch;
use base::cross_process_instant::CrossProcessInstant;
use base::generic_channel::{GenericSender, RoutedReceiver};
use base::id::{PipelineId, WebViewId};
use base::id::{PipelineId, RenderingGroupId, WebViewId};
use bitflags::bitflags;
use compositing_traits::display_list::{CompositorDisplayListInfo, ScrollTree, ScrollType};
use compositing_traits::rendering_context::RenderingContext;
@ -792,11 +792,13 @@ impl IOCompositor {
number_of_font_keys,
number_of_font_instance_keys,
result_sender,
rendering_group_id,
) => {
self.handle_generate_font_keys(
number_of_font_keys,
number_of_font_instance_keys,
result_sender,
rendering_group_id,
);
},
CompositorMsg::Viewport(webview_id, viewport_description) => {
@ -834,11 +836,13 @@ impl IOCompositor {
number_of_font_keys,
number_of_font_instance_keys,
result_sender,
rendering_group_id,
) => {
self.handle_generate_font_keys(
number_of_font_keys,
number_of_font_instance_keys,
result_sender,
rendering_group_id,
);
},
CompositorMsg::NewWebRenderFrameReady(..) => {
@ -852,11 +856,13 @@ impl IOCompositor {
}
/// Generate the font keys and send them to the `result_sender`.
/// Currently `RenderingGroupId` is not used.
fn handle_generate_font_keys(
&self,
number_of_font_keys: usize,
number_of_font_instance_keys: usize,
result_sender: GenericSender<(Vec<FontKey>, Vec<FontInstanceKey>)>,
_rendering_group_id: RenderingGroupId,
) {
let font_keys = (0..number_of_font_keys)
.map(|_| self.global.borrow().webrender_api.generate_font_key())