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compositing: Move image output and shutdown management out of the compositor (#35538)

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This is a step toward the renderer-per-WebView goal. It moves various
details out of `IOCompositor`.

- Image output: This is moved to servoshell as now applications can
  access the image contents of a `WebView` via
  `RenderingContext::read_to_image`. Most options for this are moved to
  `ServoShellPreferences` apart from `wait_for_stable_image` as this
  requires a specific kind of coordination in the `ScriptThread` that is
  also very expensive. Instead, paint is now simply delayed until a
  stable image is reached and `WebView::paint()` returns a boolean.
  Maybe this can be revisited in the future.
- Shutdown: Shutdown is now managed by libservo itself. Shutdown state
  is shared between the compositor and `Servo` instance. In the future,
  this sharing might be unecessary.
- `CompositeTarget` has been removed entirely. This no longer needs to
   be passed when creating a Servo instance.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Ngo Iok Ui (Wu Yu Wei) <yuweiwu@pm.me>
This commit is contained in:
Martin Robinson 2025-02-20 19:27:49 +01:00 • committed by GitHub
parent 7d33e72bfc
commit 54b5c7b632
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25 changed files with 233 additions and 270 deletions
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4
ports/servoshell/Cargo.toml
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@ -66,6 +66,7 @@ keyboard-types = { workspace = true }
log = { workspace = true }
getopts = { workspace = true }
hitrace = { workspace = true, optional = true }
image = { workspace = true }
mime_guess = { workspace = true }
url = { workspace = true }
raw-window-handle = { workspace = true }
@ -125,9 +126,6 @@ tinyfiledialogs = "3.0"
egui-file-dialog = "0.9.0"
winit = "0.30.9"
[target.'cfg(any(all(target_os = "linux", not(target_env = "ohos")), target_os = "windows"))'.dependencies]
image = { workspace = true }
[target.'cfg(any(all(target_os = "linux", not(target_env = "ohos")), target_os = "macos"))'.dependencies]
sig = "1.0"