From 19c6455e8ddcbb230a72596a5f0117398ed4253e Mon Sep 17 00:00:00 2001
From: Rana718 <ranadolui718@gmail.com>
Date: Sun, 5 Jul 2026 18:36:15 +0530
Subject: [PATCH] app: enable transparent CSD windows on Wayland

---
 app/os_wayland.go |  7 +++++++
 app/window.go     | 10 +++-------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/app/os_wayland.go b/app/os_wayland.go
index b020c6d17..1f71867d1 100644
--- a/app/os_wayland.go
+++ b/app/os_wayland.go
@@ -1121,6 +1121,7 @@ func (w *window) setWindowConstraints() {
 	if scaled := w.config.MaxSize.Div(w.scale); scaled != (image.Point{}) {
 		C.xdg_toplevel_set_max_size(w.topLvl, C.int32_t(scaled.X), C.int32_t(scaled.Y+decoHeight))
 	}
+	w.updateOpaqueRegion()
 }
 
 // decoHeight returns the adjustment for client-side decorations, if applicable.
@@ -1724,6 +1725,12 @@ func (w *window) systemGesture() (*C.struct_wl_cursor, C.uint32_t) {
 }
 
 func (w *window) updateOpaqueRegion() {
+	if !w.config.Decorated {
+		// Don't mark CSD windows as opaque so the compositor can apply
+		// rounded corners and transparency effects.
+		C.wl_surface_set_opaque_region(w.surf, nil)
+		return
+	}
 	reg := C.wl_compositor_create_region(w.disp.compositor)
 	C.wl_region_add(reg, 0, 0, C.int32_t(w.size.X), C.int32_t(w.size.Y))
 	C.wl_surface_set_opaque_region(w.surf, reg)
diff --git a/app/window.go b/app/window.go
index d232968f0..6b6019fc6 100644
--- a/app/window.go
+++ b/app/window.go
@@ -207,13 +207,9 @@ func (w *Window) validateAndProcess(size image.Point, sync bool, frame *op.Ops,
 }
 
 func (w *Window) frame(frame *op.Ops, viewport image.Point) error {
-	if runtime.GOOS == "js" {
-		// Use transparent black when Gio is embedded, to allow mixing of Gio and
-		// foreign content below.
-		w.gpu.Clear(color.NRGBA{A: 0x00, R: 0x00, G: 0x00, B: 0x00})
-	} else {
-		w.gpu.Clear(color.NRGBA{A: 0xff, R: 0xff, G: 0xff, B: 0xff})
-	}
+	// Use transparent clear color to support window transparency and
+	// compositor-drawn rounded corners on Wayland/macOS.
+	w.gpu.Clear(color.NRGBA{A: 0x00, R: 0x00, G: 0x00, B: 0x00})
 	target, err := w.ctx.RenderTarget()
 	if err != nil {
 		return err