Add push_clip_layer (#30)

* Add `push_clip_layer`

Signed-off-by: sagudev <[email protected]>

* add `transform: Affine` to `push_clip_layer`

Signed-off-by: sagudev <[email protected]>

---------

Signed-off-by: sagudev <[email protected]>

Author: sagudev

crates/anyrender/src/lib.rs

@@ -95,6 +95,11 @@ pub trait PaintScene {
         clip: &impl Shape,
     );
 
+    /// Pushes a new clip layer clipped by the specified shape.
+    /// Every drawing command after this call will be clipped by the shape until the layer is popped.
+    /// However, the transforms are not saved or modified by the layer stack.
+    fn push_clip_layer(&mut self, transform: Affine, clip: &impl Shape);
+
     /// Pops the current layer.
     fn pop_layer(&mut self);
 

crates/anyrender/src/null_backend.rs

@@ -91,6 +91,8 @@ impl PaintScene for NullScenePainter {
     ) {
     }
 
+    fn push_clip_layer(&mut self, _transform: kurbo::Affine, _clip: &impl kurbo::Shape) {}
+
     fn pop_layer(&mut self) {}
 
     fn stroke<'a>(

crates/anyrender_skia/src/scene.rs

@@ -394,6 +394,14 @@ impl PaintScene for SkiaScenePainter<'_> {
         }
     }
 
+    fn push_clip_layer(&mut self, transform: kurbo::Affine, clip: &impl kurbo::Shape) {
+        self.inner.save(); // we need to do two saves because of pop_layer
+
+        self.set_matrix(transform);
+        self.clip(clip);
+        self.inner.save();
+    }
+
     fn pop_layer(&mut self) {
         self.inner.restore();
         self.inner.restore();

crates/anyrender_vello/src/scene.rs

@@ -60,6 +60,10 @@ impl PaintScene for VelloScenePainter<'_, '_> {
         self.inner.push_layer(blend, alpha, transform, clip);
     }
 
+    fn push_clip_layer(&mut self, transform: Affine, clip: &impl Shape) {
+        self.inner.push_clip_layer(transform, clip);
+    }
+
     fn pop_layer(&mut self) {
         self.inner.pop_layer();
     }

crates/anyrender_vello_cpu/src/scene.rs

@@ -63,6 +63,11 @@ impl PaintScene for VelloCpuScenePainter {
         );
     }
 
+    fn push_clip_layer(&mut self, transform: Affine, clip: &impl Shape) {
+        self.0.set_transform(transform);
+        self.0.push_clip_layer(&clip.into_path(DEFAULT_TOLERANCE));
+    }
+
     fn pop_layer(&mut self) {
         self.0.pop_layer();
     }

crates/anyrender_vello_hybrid/src/scene.rs

@@ -103,6 +103,12 @@ impl PaintScene for VelloHybridScenePainter<'_> {
         );
     }
 
+    fn push_clip_layer(&mut self, transform: Affine, clip: &impl Shape) {
+        self.scene.set_transform(transform);
+        self.scene
+            .push_clip_layer(&clip.into_path(DEFAULT_TOLERANCE));
+    }
+
     fn pop_layer(&mut self) {
         self.scene.pop_layer();
     }