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constellation: Pass system theme to new Pipelines (#37132)

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Previously, when the theme was set it was only set on currently active
`Window`s. This change makes setting the `Theme` stateful. Now the
`Constellation` tracks what theme is applied to a `WebView` and properly
passes that value to new `Pipeline`s when they are constructed. In
addition, the value is passed to layout when that is constructed as
well.

Testing: this change adds a unit test.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-05-26 14:05:38 +02:00 • committed by GitHub
parent c96de69e80
commit d3e57a513c
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GPG key ID: B5690EEEBB952194
19 changed files with 201 additions and 74 deletions
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12
components/layout/layout_impl.rs
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@ -15,7 +15,7 @@ use base::Epoch;
use base::id::{PipelineId, WebViewId};
use compositing_traits::CrossProcessCompositorApi;
use constellation_traits::ScrollState;
use embedder_traits::{UntrustedNodeAddress, ViewportDetails};
use embedder_traits::{Theme, UntrustedNodeAddress, ViewportDetails};
use euclid::default::{Point2D as UntypedPoint2D, Rect as UntypedRect};
use euclid::{Point2D, Scale, Size2D, Vector2D};
use fnv::FnvHashMap;
@ -503,8 +503,7 @@ impl LayoutThread {
Scale::new(config.viewport_details.hidpi_scale_factor.get()),
Box::new(LayoutFontMetricsProvider(config.font_context.clone())),
ComputedValues::initial_values_with_font_override(font),
// TODO: obtain preferred color scheme from embedder
PrefersColorScheme::Light,
config.theme.into(),
);
LayoutThread {
@ -951,7 +950,8 @@ impl LayoutThread {
size_did_change || pixel_ratio_did_change
}
fn theme_did_change(&self, theme: PrefersColorScheme) -> bool {
fn theme_did_change(&self, theme: Theme) -> bool {
let theme: PrefersColorScheme = theme.into();
theme != self.device().color_scheme()
}
@ -959,7 +959,7 @@ impl LayoutThread {
fn update_device(
&mut self,
viewport_details: ViewportDetails,
theme: PrefersColorScheme,
theme: Theme,
guards: &StylesheetGuards,
) {
let device = Device::new(
@ -969,7 +969,7 @@ impl LayoutThread {
Scale::new(viewport_details.hidpi_scale_factor.get()),
Box::new(LayoutFontMetricsProvider(self.font_context.clone())),
self.stylist.device().default_computed_values().to_arc(),
theme,
theme.into(),
);
// Preserve any previously computed root font size.