Canvas: implement transformation matrix rotation.

components/script/dom/canvasrenderingcontext2d.rs

@@ -355,6 +355,20 @@ impl<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D>
         self.update_transform()
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-context-2d-rotate
+    fn Rotate(self, angle: f64) {
+        if angle == 0.0 || !angle.is_finite() {
+            return;
+        }
+
+        let (sin, cos) = (angle.sin(), angle.cos());
+        let transform = self.state.borrow().transform;
+        self.state.borrow_mut().transform = transform.mul(&Matrix2D::new(cos as f32, sin as f32,
+                                                                         -sin as f32, cos as f32,
+                                                                         0.0, 0.0));
+        self.update_transform()
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-context-2d-translate
     fn Translate(self, x: f64, y: f64) {
         if !(x.is_finite() && y.is_finite()) {

components/script/dom/webidls/CanvasRenderingContext2D.webidl

@@ -32,7 +32,7 @@ interface CanvasRenderingContext2D {
   // transformations (default transform is the identity matrix)
   //         attribute SVGMatrix currentTransform;
   void scale(unrestricted double x, unrestricted double y);
-  //void rotate(unrestricted double angle);
+  void rotate(unrestricted double angle);
   void translate(unrestricted double x, unrestricted double y);
   void transform(unrestricted double a,
                  unrestricted double b,

tests/wpt/metadata/2dcontext/transformations/2d.transformation.order.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.order.html]
-  type: testharness
-  [Transformations are applied in the right order]
-    expected: FAIL
-

tests/wpt/metadata/2dcontext/transformations/2d.transformation.rotate.direction.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.rotate.direction.html]
-  type: testharness
-  [rotate() is clockwise]
-    expected: FAIL
-

tests/wpt/metadata/2dcontext/transformations/2d.transformation.rotate.nonfinite.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.rotate.nonfinite.html]
-  type: testharness
-  [rotate() with Infinity/NaN is ignored]
-    expected: FAIL
-

tests/wpt/metadata/2dcontext/transformations/2d.transformation.rotate.radians.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.rotate.radians.html]
-  type: testharness
-  [rotate() uses radians]
-    expected: FAIL
-

tests/wpt/metadata/2dcontext/transformations/2d.transformation.rotate.wrap.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.rotate.wrap.html]
-  type: testharness
-  [rotate() wraps large positive values correctly]
-    expected: FAIL
-

tests/wpt/metadata/2dcontext/transformations/2d.transformation.rotate.wrapnegative.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.rotate.wrapnegative.html]
-  type: testharness
-  [rotate() wraps large negative values correctly]
-    expected: FAIL
-

tests/wpt/metadata/2dcontext/transformations/2d.transformation.rotate.zero.html.ini

@@ -1,5 +0,0 @@
-[2d.transformation.rotate.zero.html]
-  type: testharness
-  [rotate() by 0 does nothing]
-    expected: FAIL
-

tests/wpt/metadata/html/dom/interfaces.html.ini

@@ -6828,9 +6828,6 @@
   [CanvasRenderingContext2D interface: attribute currentTransform]
     expected: FAIL
 
-  [CanvasRenderingContext2D interface: operation rotate(unrestricted double)]
-    expected: FAIL
-
   [CanvasRenderingContext2D interface: operation resetTransform()]
     expected: FAIL
 
@@ -6960,12 +6957,6 @@
   [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "currentTransform" with the proper type (6)]
     expected: FAIL
 
-  [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "rotate" with the proper type (8)]
-    expected: FAIL
-
-  [CanvasRenderingContext2D interface: calling rotate(unrestricted double) on document.createElement("canvas").getContext("2d") with too few arguments must throw TypeError]
-    expected: FAIL
-
   [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "resetTransform" with the proper type (12)]
     expected: FAIL