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constellation: Stop assuming that the viewport is shared by all WebViews (#36312)

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The `Constellation` previously held a `window_size` member, but this
assumes that all `WebView`s have the same size. This change removes that
assumption as well as making sure that all `WebView`s pass their size
and HiDIP scaling to the `Constellation` when they are created.

In addition

- `WindowSizeData` is renamed to `ViewportDetails`, as it was
holding more than just the size and it didn't necessarily correspond to
  a "window." It's used for tracking viewport data, whether for an
  `<iframe>` or the main `WebView` viewport.
- `ViewportDetails` is stored more consistently so that conceptually an
  `<iframe>` can also have its own HiDPI scaling. This isn't something
  we necessarily want, but it makes everything conceptually simpler.

The goal with this change is to work toward allowing per-`WebView` HiDPI
scaling and sizing. There are still some corresponding changes in the
compositor to make that happen, but they will in a subsequent change.

Testing: This is covered by existing tests. There should be no behavior
changes.
Fixes: This is part of #36232.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-04-04 19:06:34 +02:00 • committed by GitHub
parent 7c89e24f34
commit fb344ba4e9
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26 changed files with 272 additions and 256 deletions
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26
components/shared/constellation/lib.rs
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@ -17,17 +17,18 @@ use base::Epoch;
use base::cross_process_instant::CrossProcessInstant;
use base::id::{PipelineId, ScrollTreeNodeId, WebViewId};
use bitflags::bitflags;
use embedder_traits::{Cursor, InputEvent, MediaSessionActionType, Theme, WebDriverCommandMsg};
use euclid::{Scale, Size2D, Vector2D};
use embedder_traits::{
Cursor, InputEvent, MediaSessionActionType, Theme, ViewportDetails, WebDriverCommandMsg,
};
use euclid::Vector2D;
use ipc_channel::ipc::IpcSender;
use malloc_size_of::malloc_size_of_is_0;
use malloc_size_of_derive::MallocSizeOf;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use servo_url::ServoUrl;
use strum_macros::IntoStaticStr;
use style_traits::CSSPixel;
use webrender_api::ExternalScrollId;
use webrender_api::units::{DevicePixel, LayoutPixel};
use webrender_api::units::LayoutPixel;
/// Messages to the constellation.
#[derive(IntoStaticStr)]
@ -47,8 +48,8 @@ pub enum ConstellationMsg {
ClearCache,
/// Request to traverse the joint session history of the provided browsing context.
TraverseHistory(WebViewId, TraversalDirection),
/// Inform the constellation of a window being resized.
WindowSize(WebViewId, WindowSizeData, WindowSizeType),
/// Inform the Constellation that a `WebView`'s [`ViewportDetails`] have changed.
ChangeViewportDetails(WebViewId, ViewportDetails, WindowSizeType),
/// Inform the constellation of a theme change.
ThemeChange(Theme),
/// Requests that the constellation instruct layout to begin a new tick of the animation.
@ -60,7 +61,7 @@ pub enum ConstellationMsg {
/// A log entry, with the top-level browsing context id and thread name
LogEntry(Option<WebViewId>, Option<String>, LogEntry),
/// Create a new top level browsing context.
NewWebView(ServoUrl, WebViewId),
NewWebView(ServoUrl, WebViewId, ViewportDetails),
/// Close a top level browsing context.
CloseWebView(WebViewId),
/// Panic a top level browsing context.
@ -115,17 +116,6 @@ pub enum LogEntry {
Warn(String),
}
/// Data about the window size.
#[derive(Clone, Copy, Debug, Deserialize, MallocSizeOf, PartialEq, Serialize)]
pub struct WindowSizeData {
/// The size of the initial layout viewport, before parsing an
/// <http://www.w3.org/TR/css-device-adapt/#initial-viewport>
pub initial_viewport: Size2D<f32, CSSPixel>,
/// The resolution of the window in dppx, not including any "pinch zoom" factor.
pub device_pixel_ratio: Scale<f32, CSSPixel, DevicePixel>,
}
/// The type of window size change.
#[derive(Clone, Copy, Debug, Deserialize, Eq, MallocSizeOf, PartialEq, Serialize)]
pub enum WindowSizeType {