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Don't attempt to resize Offscreencanvas without a rendering context (#36855)

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When the canvas context mode is a placeholder then we shouldn't resize
the context.

Testing: Includes a new test
Fixes: https://github.com/servo/servo/issues/36846

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-05-11 17:27:33 +02:00 • committed by GitHub
parent d2afe00f7b
commit dc0e7587bf
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5 changed files with 65 additions and 30 deletions
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20
components/script/dom/offscreencanvas.rs
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@ -24,12 +24,20 @@ use crate::dom::htmlcanvaselement::HTMLCanvasElement;
use crate::dom::offscreencanvasrenderingcontext2d::OffscreenCanvasRenderingContext2D;
use crate::script_runtime::{CanGc, JSContext};
/// <https://html.spec.whatwg.org/multipage/#offscreencanvas>
#[dom_struct]
pub(crate) struct OffscreenCanvas {
eventtarget: EventTarget,
width: Cell<u64>,
height: Cell<u64>,
/// Represents both the [bitmap] and the [context mode] of the canvas.
///
/// [bitmap]: https://html.spec.whatwg.org/multipage/#offscreencanvas-bitmap
/// [context mode]: https://html.spec.whatwg.org/multipage/#offscreencanvas-context-mode
context: DomRefCell<Option<OffscreenRenderingContext>>,
/// <https://html.spec.whatwg.org/multipage/#offscreencanvas-placeholder>
placeholder: Option<Dom<HTMLCanvasElement>>,
}
@ -119,7 +127,7 @@ impl OffscreenCanvas {
}
impl OffscreenCanvasMethods<crate::DomTypeHolder> for OffscreenCanvas {
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas>
fn Constructor(
global: &GlobalScope,
proto: Option<HandleObject>,
@ -131,7 +139,7 @@ impl OffscreenCanvasMethods<crate::DomTypeHolder> for OffscreenCanvas {
Ok(offscreencanvas)
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-getcontext
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-getcontext>
fn GetContext(
&self,
_cx: JSContext,
@ -155,12 +163,12 @@ impl OffscreenCanvasMethods<crate::DomTypeHolder> for OffscreenCanvas {
}
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width>
fn Width(&self) -> u64 {
self.width.get()
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width>
fn SetWidth(&self, value: u64, can_gc: CanGc) {
self.width.set(value);
@ -173,12 +181,12 @@ impl OffscreenCanvasMethods<crate::DomTypeHolder> for OffscreenCanvas {
}
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height>
fn Height(&self) -> u64 {
self.height.get()
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height>
fn SetHeight(&self, value: u64, can_gc: CanGc) {
self.height.set(value);