Add a no-subsurfaces feature for debugging

Cargo.toml

@@ -38,6 +38,7 @@ default = ["wgpu"]
 wgpu = ["libcosmic/wgpu"]
 # Debugging features
 force-shm-screencopy = []
+no-subsurfaces = ["force-shm-screencopy"]
 
 [profile.dev]
 # Not usable at opt-level 0, at least with software renderer

src/view/mod.rs

@@ -284,7 +284,14 @@ fn toplevel_previews<'a>(
 
 fn capture_image(image: Option<&CaptureImage>) -> cosmic::Element<'_, Msg> {
     if let Some(image) = image {
-        Subsurface::new(image.width, image.height, &image.wl_buffer).into()
+        #[cfg(feature = "no-subsurfaces")]
+        {
+            widget::Image::new(image.image.clone()).into()
+        }
+        #[cfg(not(feature = "no-subsurfaces"))]
+        {
+            Subsurface::new(image.width, image.height, &image.wl_buffer).into()
+        }
     } else {
         widget::Image::new(widget::image::Handle::from_pixels(1, 1, vec![0, 0, 0, 255])).into()
     }

src/wayland/buffer.rs

@@ -69,6 +69,8 @@ pub struct Buffer {
     pub buffer: wl_buffer::WlBuffer,
     node: Option<PathBuf>,
     pub size: (u32, u32),
+    #[cfg(feature = "no-subsurfaces")]
+    pub mmap: memmap2::Mmap,
 }
 
 impl AppData {
@@ -96,6 +98,9 @@ impl AppData {
 
         pool.destroy();
 
+        #[cfg(feature = "no-subsurfaces")]
+        let mmap = unsafe { memmap2::Mmap::map(&fd).unwrap() };
+
         Buffer {
             backing: Arc::new(
                 Shmbuf {
@@ -109,6 +114,8 @@ impl AppData {
                 .into(),
             ),
             buffer,
+            #[cfg(feature = "no-subsurfaces")]
+            mmap,
             node: None,
             size: (width, height),
         }

src/wayland/mod.rs

@@ -87,6 +87,8 @@ pub struct CaptureImage {
     pub width: u32,
     pub height: u32,
     pub wl_buffer: SubsurfaceBuffer,
+    #[cfg(feature = "no-subsurfaces")]
+    pub image: cosmic::widget::image::Handle,
 }
 
 pub fn subscription(conn: Connection) -> iced::Subscription<Event> {

src/wayland/screencopy.rs

@@ -208,12 +208,16 @@ impl ScreencopyHandler for AppData {
         let front = session.buffers.as_mut().unwrap().first_mut().unwrap();
         let (buffer, release) = SubsurfaceBuffer::new(front.backing.clone());
         session.release = Some(release);
-        // let img = unsafe { front.to_image() };
-        // let image = CaptureImage { img };
         let image = CaptureImage {
             wl_buffer: buffer,
             width: front.size.0,
             height: front.size.1,
+            #[cfg(feature = "no-subsurfaces")]
+            image: cosmic::widget::image::Handle::from_pixels(
+                front.size.0,
+                front.size.1,
+                front.mmap.to_vec(),
+            ),
         };
         match &capture.source {
             CaptureSource::Toplevel(toplevel) => {