fix(windows): resolve DWM transparency, eliminate white flash, fix capture staging, and terminate locked processes in installer

Cargo.lock

@@ -3700,7 +3700,7 @@ dependencies = [
 
 [[package]]
 name = "scythe"
-version = "0.2.2"
+version = "0.2.3"
 dependencies = [
  "ashpd",
  "cpal",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "scythe"
-version = "0.2.2"
+version = "0.2.3"
 edition = "2024"
 
 [[bin]]
@@ -45,9 +45,11 @@ windows = { version = "0.58.0", features = [
     "Win32_Graphics_Direct3D11",
     "Win32_Graphics_Dxgi",
     "Win32_Graphics_Dxgi_Common",
+    "Win32_Graphics_Dwm",
     "Win32_Graphics_Gdi",
     "Win32_Security",
     "Win32_System_Com",
     "Win32_UI_WindowsAndMessaging",
+    "Win32_UI_Controls",
     "Win32_System_Threading",
 ] }

packaging/windows/scythe-installer.nsi

@@ -26,6 +26,12 @@ RequestExecutionLevel user
 !insertmacro MUI_LANGUAGE "English"
 
 Section "Scythe" SecMain
+  ; Terminate any running instances so locked executables and DLLs can be updated cleanly
+  nsExec::Exec 'cmd.exe /C taskkill /F /IM scythe-ui.exe /T >nul 2>&1'
+  nsExec::Exec 'cmd.exe /C taskkill /F /IM scythe-daemon.exe /T >nul 2>&1'
+  Sleep 500
+
+  SetOverwrite on
   SetOutPath "$INSTDIR"
   File /r "..\..\dist\bundle\*.*"
 
@@ -43,6 +49,10 @@ Section "Scythe" SecMain
 SectionEnd
 
 Section "Uninstall"
+  nsExec::Exec 'cmd.exe /C taskkill /F /IM scythe-ui.exe /T >nul 2>&1'
+  nsExec::Exec 'cmd.exe /C taskkill /F /IM scythe-daemon.exe /T >nul 2>&1'
+  Sleep 500
+
   Delete "$DESKTOP\scythe.lnk"
   RMDir /r "$SMPROGRAMS\scythe"
   RMDir /r "$INSTDIR"

packaging/windows/scythe-standalone.nsi

@@ -8,6 +8,12 @@ SilentInstall silent
 RequestExecutionLevel user
 
 Section
+  ; Terminate any running instances so locked executables and DLLs can be updated cleanly
+  nsExec::Exec 'cmd.exe /C taskkill /F /IM scythe-ui.exe /T >nul 2>&1'
+  nsExec::Exec 'cmd.exe /C taskkill /F /IM scythe-daemon.exe /T >nul 2>&1'
+  Sleep 500
+
+  SetOverwrite on
   ; Extract self-contained binaries and all runtime DLLs directly to user app data
   SetOutPath "$LOCALAPPDATA\scythe"
   File /r "..\..\dist\bundle\*.*"

src/capture/windows.rs

@@ -15,9 +15,10 @@ pub struct WindowsCapture {
     device: ID3D11Device,
     context: ID3D11DeviceContext,
     duplication: IDXGIOutputDuplication,
-    gpu_texture: ID3D11Texture2D,
+    staging_texture: ID3D11Texture2D,
     pub width: u32,
     pub height: u32,
+    last_frame: Vec<u8>,
 }
 
 #[cfg(target_os = "windows")]
@@ -85,33 +86,34 @@ impl WindowsCapture {
             // Initialize Desktop Duplication
             let duplication = output1.DuplicateOutput(&device)?;
 
-            // Allocate a dedicated VRAM-resident GPU texture for 100% zero-copy capture
-            let gpu_desc = D3D11_TEXTURE2D_DESC {
+            // Allocate a CPU-accessible staging texture for hardware frame reading
+            let staging_desc = D3D11_TEXTURE2D_DESC {
                 Width: width,
                 Height: height,
                 MipLevels: 1,
                 ArraySize: 1,
                 Format: DXGI_FORMAT_B8G8R8A8_UNORM,
                 SampleDesc: DXGI_SAMPLE_DESC { Count: 1, Quality: 0 },
-                Usage: D3D11_USAGE_DEFAULT,
-                BindFlags: (D3D11_BIND_RENDER_TARGET.0 | D3D11_BIND_SHADER_RESOURCE.0) as u32,
-                CPUAccessFlags: 0,
+                Usage: D3D11_USAGE_STAGING,
+                BindFlags: 0,
+                CPUAccessFlags: D3D11_CPU_ACCESS_READ.0 as u32,
                 MiscFlags: 0,
             };
 
-            let mut gpu_texture: Option<ID3D11Texture2D> = None;
-            device.CreateTexture2D(&gpu_desc, None, Some(&mut gpu_texture))?;
-            let gpu_texture = gpu_texture.ok_or("Failed to create GPU VRAM texture")?;
+            let mut staging_texture: Option<ID3D11Texture2D> = None;
+            device.CreateTexture2D(&staging_desc, None, Some(&mut staging_texture))?;
+            let staging_texture = staging_texture.ok_or("Failed to create D3D11 staging texture")?;
 
-            println!("Windows DXGI Hardware Capture active (Pure GPU Zero-Copy): {}x{}", width, height);
+            println!("Windows DXGI Hardware Desktop Duplication active: {}x{}", width, height);
 
             Ok(Self {
                 device,
                 context,
                 duplication,
-                gpu_texture,
+                staging_texture,
                 width,
                 height,
+                last_frame: Vec::new(),
             })
         }
     }
@@ -143,32 +145,51 @@ impl FrameSource for WindowsCapture {
             let mut desktop_resource: Option<IDXGIResource> = None;
 
             for _ in 0..5 {
-                match self.duplication.AcquireNextFrame(150, &mut frame_info, &mut desktop_resource) {
+                match self.duplication.AcquireNextFrame(100, &mut frame_info, &mut desktop_resource) {
                     Ok(()) => {
                         if let Some(resource) = desktop_resource {
                             let texture: ID3D11Texture2D = resource.cast()?;
                             
-                            // Copy directly on the GPU from desktop buffer to persistent VRAM texture
-                            self.context.CopyResource(&self.gpu_texture, &texture);
+                            // Copy GPU desktop texture to staging texture accessible by CPU
+                            self.context.CopyResource(&self.staging_texture, &texture);
                             
                             // Immediately release the desktop frame back to the DWM compositor
                             let _ = self.duplication.ReleaseFrame();
 
-                            return Ok(Frame::D3D11Texture {
-                                handle: self.gpu_texture.as_raw() as usize,
+                            let mut mapped = D3D11_MAPPED_SUBRESOURCE::default();
+                            self.context.Map(&self.staging_texture, 0, D3D11_MAP_READ, 0, Some(&mut mapped))?;
+
+                            let stride = mapped.RowPitch as usize;
+                            let total_bytes = stride * self.height as usize;
+                            if self.last_frame.len() != total_bytes {
+                                self.last_frame.resize(total_bytes, 0);
+                            }
+                            std::ptr::copy_nonoverlapping(
+                                mapped.pData as *const u8,
+                                self.last_frame.as_mut_ptr(),
+                                total_bytes,
+                            );
+                            self.context.Unmap(&self.staging_texture, 0);
+
+                            return Ok(Frame::Raw {
                                 width: self.width,
                                 height: self.height,
+                                stride: stride as u32,
+                                data: self.last_frame.clone(),
                             });
                         }
                         let _ = self.duplication.ReleaseFrame();
                     }
                     Err(e) if e.code() == DXGI_ERROR_WAIT_TIMEOUT => {
+                        if !self.last_frame.is_empty() {
+                            return Ok(Frame::Raw {
+                                width: self.width,
+                                height: self.height,
+                                stride: self.width * 4,
+                                data: self.last_frame.clone(),
+                            });
+                        }
                         std::thread::sleep(std::time::Duration::from_millis(8));
-                        return Ok(Frame::D3D11Texture {
-                            handle: self.gpu_texture.as_raw() as usize,
-                            width: self.width,
-                            height: self.height,
-                        });
                     }
                     Err(e) if e.code() == DXGI_ERROR_ACCESS_LOST => {
                         println!("DXGI access lost (display mode or fullscreen switch), reacquiring...");
@@ -182,11 +203,21 @@ impl FrameSource for WindowsCapture {
                 }
             }
 
-            Ok(Frame::D3D11Texture {
-                handle: self.gpu_texture.as_raw() as usize,
-                width: self.width,
-                height: self.height,
-            })
+            if !self.last_frame.is_empty() {
+                Ok(Frame::Raw {
+                    width: self.width,
+                    height: self.height,
+                    stride: self.width * 4,
+                    data: self.last_frame.clone(),
+                })
+            } else {
+                Ok(Frame::Raw {
+                    width: self.width,
+                    height: self.height,
+                    stride: self.width * 4,
+                    data: vec![0u8; (self.width * self.height * 4) as usize],
+                })
+            }
         }
     }
 }

src/hotkey.rs

@@ -70,8 +70,8 @@ pub fn parse_hotkey(s: &str) -> Option<HotKey> {
                     "delete" | "del" => Some(Code::Delete),
                     "home" => Some(Code::Home),
                     "end" => Some(Code::End),
-                    "pageup" | "pgup" => Some(Code::PageUp),
-                    "pagedown" | "pgdn" => Some(Code::PageDown),
+                    "pageup" | "pgup" | "page_up" => Some(Code::PageUp),
+                    "pagedown" | "pgdn" | "page_down" => Some(Code::PageDown),
                     _ => None,
                 };
             }

src/overlay_egui.rs

@@ -912,7 +912,7 @@ impl ScytheOverlayApp {
                 self.output_dir = new_dir.clone();
                 self.config.output_directory = new_dir;
                 let _ = self.config.save();
-                let _ = ipc::send_command(Command::ReloadConfig);
+                async_send_command(Command::ReloadConfig);
                 self.refresh_clips();
             }
         }
@@ -2130,18 +2130,21 @@ impl eframe::App for ScytheOverlayApp {
         if self.listening_keybind.is_some() || self.hud_notification.is_some() {
             ctx.request_repaint();
         } else {
-            ctx.request_repaint_after(Duration::from_millis(33));
+            ctx.request_repaint_after(Duration::from_millis(16));
         }
 
-        // Auto-position and size to monitor on launch
+        // Auto-position, DWM transparency, and size to monitor on launch
         if !self.initial_pos_set {
             if let Some(monitor_size) = ctx.input(|i| i.viewport().monitor_size) {
                 if monitor_size.x > 100.0 && monitor_size.y > 100.0 {
                     ctx.send_viewport_cmd(egui::ViewportCommand::OuterPosition(egui::pos2(0.0, 0.0)));
                     ctx.send_viewport_cmd(egui::ViewportCommand::InnerSize(monitor_size));
-                    self.initial_pos_set = true;
                 }
             }
+            #[cfg(target_os = "windows")]
+            apply_windows_transparency("Scythe");
+            ctx.send_viewport_cmd(egui::ViewportCommand::Visible(true));
+            self.initial_pos_set = true;
         }
 
         // Handle interactive keybind recording mode
@@ -2155,6 +2158,10 @@ impl eframe::App for ScytheOverlayApp {
                             break;
                         }
                         if let Some(key_name) = format_egui_key(*key) {
+                            let k_lower = key_name.to_lowercase();
+                            if ["alt", "ctrl", "control", "shift", "super", "meta", "command"].contains(&k_lower.as_str()) {
+                                continue;
+                            }
                             let mut parts = Vec::new();
                             if modifiers.ctrl {
                                 parts.push("Ctrl");
@@ -2259,6 +2266,27 @@ impl eframe::App for ScytheOverlayApp {
     }
 }
 
+#[cfg(target_os = "windows")]
+pub fn apply_windows_transparency(title: &str) {
+    unsafe {
+        use windows::Win32::UI::WindowsAndMessaging::FindWindowW;
+        use windows::Win32::Graphics::Dwm::DwmExtendFrameIntoClientArea;
+        use windows::Win32::UI::Controls::MARGINS;
+        use windows::core::HSTRING;
+
+        let htitle = HSTRING::from(title);
+        if let Ok(hwnd) = FindWindowW(None, &htitle) {
+            let margins = MARGINS {
+                cxLeftWidth: -1,
+                cxRightWidth: -1,
+                cyTopHeight: -1,
+                cyBottomHeight: -1,
+            };
+            let _ = DwmExtendFrameIntoClientArea(hwnd, &margins);
+        }
+    }
+}
+
 pub fn run_egui_overlay() {
     #[cfg(target_os = "windows")]
     let (screen_w, screen_h): (f32, f32) = unsafe {
@@ -2280,6 +2308,7 @@ pub fn run_egui_overlay() {
             .with_resizable(false)
             .with_decorations(false)
             .with_transparent(true)
+            .with_visible(false)
             .with_always_on_top(),
         ..Default::default()
     };
@@ -2300,6 +2329,7 @@ pub struct ShadowPlayToastApp {
     accent: Color32,
     created_at: Instant,
     duration: Duration,
+    initial_setup: bool,
 }
 
 impl eframe::App for ShadowPlayToastApp {
@@ -2308,6 +2338,13 @@ impl eframe::App for ShadowPlayToastApp {
     }
 
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        if !self.initial_setup {
+            #[cfg(target_os = "windows")]
+            apply_windows_transparency("Scythe Notification");
+            ctx.send_viewport_cmd(egui::ViewportCommand::Visible(true));
+            self.initial_setup = true;
+        }
+
         let elapsed = self.created_at.elapsed().as_secs_f32();
         let total_dur = self.duration.as_secs_f32();
         if elapsed >= total_dur {
@@ -2427,6 +2464,15 @@ pub fn run_egui_toast(title: &str, subtitle: &str, icon: crate::overlay::ToastIc
     let toast_w: f32 = 340.0;
     let toast_h: f32 = 64.0;
 
+    #[cfg(target_os = "windows")]
+    unsafe {
+        use windows::Win32::UI::WindowsAndMessaging::{FindWindowW, PostMessageW, WM_CLOSE};
+        if let Ok(prev) = FindWindowW(None, windows::core::w!("Scythe Notification")) {
+            let _ = PostMessageW(prev, WM_CLOSE, windows::Win32::Foundation::WPARAM(0), windows::Win32::Foundation::LPARAM(0));
+            std::thread::sleep(Duration::from_millis(30));
+        }
+    }
+
     #[cfg(target_os = "windows")]
     let screen_w: f32 = unsafe {
         use windows::Win32::UI::WindowsAndMessaging::{GetSystemMetrics, SM_CXSCREEN};
@@ -2447,6 +2493,7 @@ pub fn run_egui_toast(title: &str, subtitle: &str, icon: crate::overlay::ToastIc
             .with_inner_size([toast_w, toast_h])
             .with_decorations(false)
             .with_transparent(true)
+            .with_visible(false)
             .with_always_on_top()
             .with_resizable(false),
         ..Default::default()
@@ -2459,6 +2506,7 @@ pub fn run_egui_toast(title: &str, subtitle: &str, icon: crate::overlay::ToastIc
         accent,
         created_at: Instant::now(),
         duration: Duration::from_millis(2800),
+        initial_setup: false,
     };
 
     // Watchdog thread to guarantee exit after duration