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script: Reduce the use of unsafe in LayoutDom (#31979)

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Remove the use of unsafe code in the layout wrappers of the DOM. The
main change here is that `unsafe_get()` no longer needs to be an unsafe
method, which allows us to transitively remove or reduce unsafe blocks
from callers. The function itself is not renamed, because it's still
a bit dangerous to start removing the layers of abstraction from actual
DOM nodes.

In addition `init_style_and_opaque_layout_data` can be merged into
`initialize_data`, which removes one more unsafe method.

Finally, a "Safety" section is added to some unsafe methods.
This commit is contained in:
Martin Robinson 2024-04-03 10:41:19 +02:00 • committed by GitHub
parent 8aaff61334
commit 18b37e676b
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19 changed files with 89 additions and 86 deletions
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4
components/script/dom/webgl2renderingcontext.rs
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@ -4474,8 +4474,8 @@ impl WebGL2RenderingContextMethods for WebGL2RenderingContext {
impl LayoutCanvasRenderingContextHelpers for LayoutDom<'_, WebGL2RenderingContext> {
#[allow(unsafe_code)]
unsafe fn canvas_data_source(self) -> HTMLCanvasDataSource {
fn canvas_data_source(self) -> HTMLCanvasDataSource {
let this = self.unsafe_get();
(*this.base.to_layout().unsafe_get()).layout_handle()
unsafe { (*this.base.to_layout().unsafe_get()).layout_handle() }
}
}