canvas: Make script/canvas thread boundry mostly stateless (#38164)

This PR removes all `Set*` commands as we will send needed options on
each request. This will allow us to remove most of state handling from
canvas paint thread (currently it's still stateful).

Testing: Existing WPT tests
work towards #38022

try run: https://github.com/sagudev/servo/actions/runs/16413823963

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

components/shared/canvas/canvas.rs

@@ -400,6 +400,38 @@ pub enum FillRule {
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, MallocSizeOf, PartialEq, Serialize)]
 pub struct CanvasId(pub u64);
 
+#[derive(Debug, Deserialize, MallocSizeOf, Serialize)]
+pub struct CompositionOptions {
+    pub alpha: f64,
+    pub composition_operation: CompositionOrBlending,
+}
+
+#[derive(Debug, Deserialize, MallocSizeOf, Serialize)]
+pub struct ShadowOptions {
+    pub offset_x: f64,
+    pub offset_y: f64,
+    pub blur: f64,
+    pub color: AbsoluteColor,
+}
+
+#[derive(Debug, Deserialize, MallocSizeOf, Serialize)]
+pub struct LineOptions {
+    pub width: f64,
+    pub cap_style: LineCapStyle,
+    pub join_style: LineJoinStyle,
+    pub miter_limit: f64,
+    pub dash: Vec<f32>,
+    pub dash_offset: f64,
+}
+
+#[derive(Debug, Deserialize, MallocSizeOf, Serialize)]
+pub struct TextOptions {
+    pub font: Option<FontStyleStruct>,
+    pub align: TextAlign,
+    pub baseline: TextBaseline,
+}
+
+#[allow(clippy::large_enum_variant)]
 #[derive(Debug, Deserialize, Serialize)]
 pub enum CanvasMsg {
     Canvas2d(Canvas2dMsg, CanvasId),
@@ -410,37 +442,82 @@ pub enum CanvasMsg {
 
 #[derive(Debug, Deserialize, Serialize)]
 pub enum Canvas2dMsg {
-    DrawImage(IpcSnapshot, Rect<f64>, Rect<f64>, bool),
-    DrawEmptyImage(Size2D<u32>, Rect<f64>, Rect<f64>),
-    DrawImageInOther(CanvasId, Size2D<u32>, Rect<f64>, Rect<f64>, bool),
-    ClearRect(Rect<f32>),
-    ClipPath(Path),
-    FillPath(FillOrStrokeStyle, Path),
-    FillText(String, f64, f64, Option<f64>, FillOrStrokeStyle, bool),
-    FillRect(Rect<f32>, FillOrStrokeStyle),
+    DrawImage(
+        IpcSnapshot,
+        Rect<f64>,
+        Rect<f64>,
+        bool,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
+    DrawEmptyImage(
+        Size2D<u32>,
+        Rect<f64>,
+        Rect<f64>,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
+    DrawImageInOther(
+        CanvasId,
+        Size2D<u32>,
+        Rect<f64>,
+        Rect<f64>,
+        bool,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
+    ClearRect(Rect<f32>, Transform2D<f32>),
+    ClipPath(Path, Transform2D<f32>),
+    FillPath(
+        FillOrStrokeStyle,
+        Path,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
+    FillText(
+        String,
+        f64,
+        f64,
+        Option<f64>,
+        FillOrStrokeStyle,
+        bool,
+        TextOptions,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
+    FillRect(
+        Rect<f32>,
+        FillOrStrokeStyle,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
     GetImageData(Rect<u32>, Size2D<u32>, IpcSender<IpcSnapshot>),
-    MeasureText(String, IpcSender<TextMetrics>),
+    MeasureText(String, IpcSender<TextMetrics>, TextOptions),
     PutImageData(Rect<u32>, IpcSnapshot),
     RestoreContext,
     SaveContext,
-    StrokeRect(Rect<f32>, FillOrStrokeStyle),
-    StrokePath(FillOrStrokeStyle, Path),
-    SetLineWidth(f32),
-    SetLineCap(LineCapStyle),
-    SetLineJoin(LineJoinStyle),
-    SetMiterLimit(f32),
-    SetLineDash(Vec<f32>),
-    SetLineDashOffset(f32),
-    SetGlobalAlpha(f32),
-    SetGlobalComposition(CompositionOrBlending),
-    SetTransform(Transform2D<f32>),
-    SetShadowOffsetX(f64),
-    SetShadowOffsetY(f64),
-    SetShadowBlur(f64),
-    SetShadowColor(AbsoluteColor),
-    SetFont(FontStyleStruct),
-    SetTextAlign(TextAlign),
-    SetTextBaseline(TextBaseline),
+    StrokeRect(
+        Rect<f32>,
+        FillOrStrokeStyle,
+        LineOptions,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
+    StrokePath(
+        Path,
+        FillOrStrokeStyle,
+        LineOptions,
+        ShadowOptions,
+        CompositionOptions,
+        Transform2D<f32>,
+    ),
     UpdateImage(IpcSender<()>),
 }