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app: enable transparent CSD windows on Wayland #170

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app: enable transparent CSD windows on Wayland #170

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7 changes: 7 additions & 0 deletions app/os_wayland.go
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
Expand Down Expand Up @@ -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)
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10 changes: 3 additions & 7 deletions app/window.go
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Expand Up @@ -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
Expand Down