Auto merge of #25734 - pylbrecht:get.transform, r=jdm

Implement CanvasRenderingContext2D.getTransform()

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix part of #25331

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- [x] There are tests for these changes

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components/script/canvas_state.rs

@@ -16,6 +16,7 @@ use crate::dom::bindings::root::{Dom, DomRoot};
 use crate::dom::bindings::str::DOMString;
 use crate::dom::canvasgradient::{CanvasGradient, CanvasGradientStyle, ToFillOrStrokeStyle};
 use crate::dom::canvaspattern::CanvasPattern;
+use crate::dom::dommatrix::DOMMatrix;
 use crate::dom::element::cors_setting_for_element;
 use crate::dom::element::Element;
 use crate::dom::globalscope::GlobalScope;
@@ -1415,6 +1416,15 @@ impl CanvasState {
         self.update_transform()
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-context-2d-gettransform
+    pub fn get_transform(&self, global: &GlobalScope) -> DomRoot<DOMMatrix> {
+        let (sender, receiver) = ipc::channel::<Transform2D<f32>>().unwrap();
+        self.send_canvas_2d_msg(Canvas2dMsg::GetTransform(sender));
+        let transform = receiver.recv().unwrap();
+
+        DOMMatrix::new(global, true, transform.cast::<f64>().to_3d())
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform
     pub fn set_transform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
         if !(a.is_finite() &&

components/script/dom/canvasrenderingcontext2d.rs

@@ -18,6 +18,7 @@ use crate::dom::bindings::root::{Dom, DomRoot, LayoutDom};
 use crate::dom::bindings::str::DOMString;
 use crate::dom::canvasgradient::CanvasGradient;
 use crate::dom::canvaspattern::CanvasPattern;
+use crate::dom::dommatrix::DOMMatrix;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::htmlcanvaselement::HTMLCanvasElement;
 use crate::dom::imagedata::ImageData;
@@ -224,6 +225,11 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
         self.canvas_state.borrow().transform(a, b, c, d, e, f)
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-context-2d-gettransform
+    fn GetTransform(&self) -> DomRoot<DOMMatrix> {
+        self.canvas_state.borrow().get_transform(&self.global())
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform
     fn SetTransform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
         self.canvas_state.borrow().set_transform(a, b, c, d, e, f)

components/script/dom/offscreencanvasrenderingcontext2d.rs

@@ -19,6 +19,7 @@ use crate::dom::bindings::root::{Dom, DomRoot};
 use crate::dom::bindings::str::DOMString;
 use crate::dom::canvasgradient::CanvasGradient;
 use crate::dom::canvaspattern::CanvasPattern;
+use crate::dom::dommatrix::DOMMatrix;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::htmlcanvaselement::HTMLCanvasElement;
 use crate::dom::imagedata::ImageData;
@@ -470,6 +471,11 @@ impl OffscreenCanvasRenderingContext2DMethods for OffscreenCanvasRenderingContex
         self.canvas_state.borrow().transform(a, b, c, d, e, f)
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-context-2d-gettransform
+    fn GetTransform(&self) -> DomRoot<DOMMatrix> {
+        self.canvas_state.borrow().get_transform(&self.global())
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform
     fn SetTransform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
         self.canvas_state.borrow().set_transform(a, b, c, d, e, f)

components/script/dom/paintrenderingcontext2d.rs

@@ -20,6 +20,7 @@ use crate::dom::bindings::str::DOMString;
 use crate::dom::canvasgradient::CanvasGradient;
 use crate::dom::canvaspattern::CanvasPattern;
 use crate::dom::canvasrenderingcontext2d::CanvasRenderingContext2D;
+use crate::dom::dommatrix::DOMMatrix;
 use crate::dom::paintworkletglobalscope::PaintWorkletGlobalScope;
 use crate::euclidext::Size2DExt;
 use canvas_traits::canvas::CanvasImageData;
@@ -119,6 +120,11 @@ impl PaintRenderingContext2DMethods for PaintRenderingContext2D {
         self.context.Transform(a, b, c, d, e, f)
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-context-2d-gettransform
+    fn GetTransform(&self) -> DomRoot<DOMMatrix> {
+        self.context.GetTransform()
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform
     fn SetTransform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
         self.context.SetTransform(a, b, c, d, e, f);

components/script/dom/webidls/CanvasRenderingContext2D.webidl

@@ -59,7 +59,7 @@ interface mixin CanvasTransform {
                  unrestricted double e,
                  unrestricted double f);
 
-  // [NewObject] DOMMatrix getTransform();
+  [NewObject] DOMMatrix getTransform();
   void setTransform(unrestricted double a,
                     unrestricted double b,
                     unrestricted double c,

components/script/dom/webidls/DOMMatrix.webidl

@@ -10,7 +10,7 @@
  * related or neighboring rights to this work.
  */
 
-[Exposed=(Window,Worker),
+[Exposed=(Window,Worker,PaintWorklet),
  LegacyWindowAlias=WebKitCSSMatrix]
 interface DOMMatrix : DOMMatrixReadOnly {
     [Throws] constructor(optional (DOMString or sequence<unrestricted double>) init);

components/script/dom/webidls/DOMMatrixReadOnly.webidl

@@ -10,7 +10,7 @@
  * related or neighboring rights to this work.
  */
 
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker,PaintWorklet)]
 interface DOMMatrixReadOnly {
     [Throws] constructor(optional (DOMString or sequence<unrestricted double>) init);
 

components/script/dom/webidls/DOMPoint.webidl

@@ -10,7 +10,7 @@
  */
 
 // http://dev.w3.org/fxtf/geometry/Overview.html#dompoint
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker,PaintWorklet)]
 interface DOMPoint : DOMPointReadOnly {
     [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
                 optional unrestricted double z = 0, optional unrestricted double w = 1);

components/script/dom/webidls/DOMPointReadOnly.webidl

@@ -10,7 +10,7 @@
  */
 
 // http://dev.w3.org/fxtf/geometry/Overview.html#dompointreadonly
-[Exposed=(Window,Worker)]
+[Exposed=(Window,Worker,PaintWorklet)]
 interface DOMPointReadOnly {
     [Throws] constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
                 optional unrestricted double z = 0, optional unrestricted double w = 1);