enhance: Implement `CanvasRenderingContext2D.measureText` (#32704)

Signed-off-by: Chocolate Pie <106949016+chocolate-pie@users.noreply.github.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/components/shared/canvas/canvas.rs b/components/shared/canvas/canvas.rs
index 43d21fd58fe..d1f59ebea3b 100644
--- a/components/shared/canvas/canvas.rs
+++ b/components/shared/canvas/canvas.rs
@@ -58,6 +58,7 @@ pub enum Canvas2dMsg {
     IsPointInPath(f64, f64, FillRule, IpcSender<bool>),
     LineTo(Point2D<f32>),
     MoveTo(Point2D<f32>),
+    MeasureText(String, IpcSender<TextMetrics>),
     PutImageData(Rect<u64>, IpcBytesReceiver),
     QuadraticCurveTo(Point2D<f32>, Point2D<f32>),
     Rect(Rect<f32>),
@@ -474,3 +475,19 @@ impl FromStr for Direction {
         }
     }
 }
+
+#[derive(Clone, Debug, Default, Deserialize, MallocSizeOf, Serialize)]
+pub struct TextMetrics {
+    pub width: f32,
+    pub actual_boundingbox_left: f32,
+    pub actual_boundingbox_right: f32,
+    pub actual_boundingbox_ascent: f32,
+    pub actual_boundingbox_descent: f32,
+    pub font_boundingbox_ascent: f32,
+    pub font_boundingbox_descent: f32,
+    pub em_height_ascent: f32,
+    pub em_height_descent: f32,
+    pub hanging_baseline: f32,
+    pub alphabetic_baseline: f32,
+    pub ideographic_baseline: f32,
+}