Auto merge of #24048 - pylbrecht:raqote, r=jrmuizel

Implement raqote backend for canvas 2D rendering

<!-- Please describe your changes on the following line: -->
This is a follow-up of #23936.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #23431

<!-- Either: -->

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/24048)
<!-- Reviewable:end -->

Cargo.lock

@@ -3702,7 +3702,7 @@ dependencies = [
 [[package]]
 name = "raqote"
 version = "0.6.2-alpha.0"
-source = "git+https://github.com/jrmuizel/raqote#b3675e6cc1ac1d854605918f6613b64636d5e47b"
+source = "git+https://github.com/jrmuizel/raqote#b1437ce88d27d376520485a1f8d60c5a480be5c1"
 dependencies = [
  "euclid 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "font-kit 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",

components/canvas/canvas_data.rs

@@ -302,14 +302,14 @@ pub enum GradientStop {
     #[cfg(feature = "canvas2d-azure")]
     Azure(azure::AzGradientStop),
     #[cfg(feature = "canvas2d-raqote")]
-    Raqote(()),
+    Raqote(raqote::GradientStop),
 }
 
 pub enum GradientStops {
     #[cfg(feature = "canvas2d-azure")]
     Azure(azure::azure_hl::GradientStops),
     #[cfg(feature = "canvas2d-raqote")]
-    Raqote(()),
+    Raqote(Vec<raqote::GradientStop>),
 }
 
 #[derive(Clone)]

components/canvas/raqote_backend.rs

@@ -11,6 +11,7 @@ use crate::canvas_paint_thread::AntialiasMode;
 use canvas_traits::canvas::*;
 use cssparser::RGBA;
 use euclid::default::{Point2D, Rect, Size2D, Transform2D, Vector2D};
+use raqote::PathOp;
 use std::marker::PhantomData;
 
 pub struct RaqoteBackend;
@@ -183,8 +184,9 @@ impl Path {
         unimplemented!()
     }
 
-    pub fn contains_point(&self, _x: f64, _y: f64, _path_transform: &Transform2D<f32>) -> bool {
+    pub fn contains_point(&self, x: f64, y: f64, _path_transform: &Transform2D<f32>) -> bool {
-        unimplemented!()
+        let path = self.as_raqote();
+        path.contains_point(0.1, path.winding, x as f32, y as f32)
     }
 
     pub fn copy_to_builder(&self) -> Box<dyn GenericPathBuilder> {
@@ -238,10 +240,14 @@ impl GenericDrawTarget for raqote::DrawTarget {
     }
     fn create_gradient_stops(
         &self,
-        _gradient_stops: Vec<GradientStop>,
+        gradient_stops: Vec<GradientStop>,
         _extend_mode: ExtendMode,
     ) -> GradientStops {
-        unimplemented!();
+        let stops = gradient_stops
+            .into_iter()
+            .map(|item| item.as_raqote().clone())
+            .collect();
+        GradientStops::Raqote(stops)
     }
     fn create_path_builder(&self) -> Box<dyn GenericPathBuilder> {
         Box::new(PathBuilder::new())
@@ -488,7 +494,19 @@ impl GenericPathBuilder for PathBuilder {
         unimplemented!();
     }
     fn get_current_point(&mut self) -> Point2D<f32> {
-        unimplemented!();
+        let path = self.finish();
+
+        for op in path.as_raqote().ops.iter().rev() {
+            match op {
+                PathOp::MoveTo(point) | PathOp::LineTo(point) => {
+                    return Point2D::new(point.x, point.y)
+                },
+                PathOp::CubicTo(_, _, point) => return Point2D::new(point.x, point.y),
+                PathOp::QuadTo(_, point) => return Point2D::new(point.x, point.y),
+                PathOp::Close => {},
+            };
+        }
+        panic!("dead end");
     }
     fn line_to(&mut self, point: Point2D<f32>) {
         self.0.as_mut().unwrap().line_to(point.x, point.y);
@@ -659,3 +677,11 @@ impl SourceSurface {
         }
     }
 }
+
+impl GradientStop {
+    fn as_raqote(&self) -> &raqote::GradientStop {
+        match self {
+            GradientStop::Raqote(s) => s,
+        }
+    }
+}