From 3fe8121975ba65bddbae1bbde92c16451eaa9368 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandroalonsofernandez@gmail.com>
Date: Mon, 16 Mar 2026 15:51:02 +0100
Subject: [PATCH] WIP

---
 render-wasm/src/render.rs | 36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/render-wasm/src/render.rs b/render-wasm/src/render.rs
index 587ae1d8a2..c5eca29749 100644
--- a/render-wasm/src/render.rs
+++ b/render-wasm/src/render.rs
@@ -1271,13 +1271,37 @@ impl RenderState {
         _timestamp: i32,
         _sync_render: bool,
     ) -> Result<(), String> {
-        let mut p = skia::Paint::default();
-        p.set_color(skia::Color::from_argb(255, 47, 44, 53));
-        p.set_style(skia::PaintStyle::Fill);
+        let fill_color = skia::Color::from_argb(255, 47, 44, 53);
+        let rect = skia::Rect::from_xywh(600.0, 600.0, 200.0, 200.0);
 
-        let b = skia::image_filters::blur((32., 32.), None, None, None);
-        p.set_image_filter(b);
-        self.surfaces.get_mut(SurfaceId::Target).canvas().draw_rect(skia::Rect::from_xywh(600.0, 600.0, 200.0, 200.0), &p);
+        // Blur margin: sigma 4 needs ~12px extra each side for Gaussian falloff
+        let sigma = 32.0;
+        let mut blur_rect = rect;
+        blur_rect.outset((1., 1.));
+
+        let mut blur_paint = skia::Paint::default();
+        blur_paint.set_image_filter(skia::image_filters::blur((sigma, sigma), Some(skia::TileMode::Clamp), None, None));
+
+        let canvas = self.surfaces.get_mut(SurfaceId::Target).canvas();
+        // canvas.clear(self.background_color);        
+        let layer_rec = skia::canvas::SaveLayerRec::default()
+            .bounds(&blur_rect)
+            .paint(&blur_paint);
+        canvas.save_layer(&layer_rec);
+
+        // Draw background first so the blur samples it at the edges (no halo when bg = fill)
+        // let mut bg_paint = skia::Paint::default();
+        // bg_paint.set_color(self.background_color);
+        // bg_paint.set_style(skia::PaintStyle::Fill);
+        // canvas.draw_rect(blur_rect, &bg_paint);
+
+        // Draw shape on top
+        let mut shape_paint = skia::Paint::default();
+        shape_paint.set_color(fill_color);
+        shape_paint.set_style(skia::PaintStyle::Fill);
+        canvas.draw_rect(rect, &shape_paint);
+
+        canvas.restore();
         self.flush_and_submit();
 
         Ok(())