fix(client): window screenshot via crop instead of PrintWindow, fix SW_MINIMIZE

crates/client/src/screenshot.rs

@@ -117,68 +117,53 @@ pub fn take_screenshot() -> Result<(String, u32, u32), String> {
     }
 }
 
-/// Capture a specific window using PrintWindow (works even if occluded).
+/// Capture a specific window by cropping the full screen to its rect.
 #[cfg(windows)]
 pub fn take_window_screenshot(window_id: u64) -> Result<(String, u32, u32), String> {
-    use windows::Win32::Foundation::HWND;
-    use windows::Win32::Graphics::Gdi::{
-        CreateCompatibleBitmap, CreateCompatibleDC, DeleteDC, DeleteObject,
-        GetDC, GetDIBits, PrintWindow, PW_RENDERFULLCONTENT, ReleaseDC,
-        SelectObject, BITMAPINFO, BITMAPINFOHEADER, DIB_RGB_COLORS,
-    };
+    use windows::Win32::Foundation::{HWND, RECT};
     use windows::Win32::UI::WindowsAndMessaging::GetWindowRect;
 
     let hwnd = HWND(window_id as isize);
-
-    unsafe {
+    let (x, y, w, h) = unsafe {
         let mut rect = RECT::default();
         GetWindowRect(hwnd, &mut rect).map_err(|e| format!("GetWindowRect failed: {e}"))?;
-        let width = (rect.right - rect.left) as u32;
-        let height = (rect.bottom - rect.top) as u32;
-        if width == 0 || height == 0 {
-            return Err(format!("Window has zero size: {width}x{height}"));
-        }
+        let w = (rect.right - rect.left) as u32;
+        let h = (rect.bottom - rect.top) as u32;
+        if w == 0 || h == 0 { return Err(format!("Window has zero size: {w}x{h}")); }
+        (rect.left, rect.top, w, h)
+    };
 
-        let hdc_screen = GetDC(None);
-        let hdc_mem = CreateCompatibleDC(hdc_screen);
-        let hbm = CreateCompatibleBitmap(hdc_screen, width as i32, height as i32);
-        let old_obj = SelectObject(hdc_mem, hbm);
+    // Take full screenshot and crop to window rect
+    let (full_b64, full_w, full_h) = take_screenshot()?;
+    let full_bytes = base64::engine::general_purpose::STANDARD
+        .decode(&full_b64).map_err(|e| format!("base64 decode: {e}"))?;
 
-        // PrintWindow captures the window even if it's behind others
-        PrintWindow(hwnd, hdc_mem, PW_RENDERFULLCONTENT);
+    // Decode PNG back to raw RGBA
+    let cursor = std::io::Cursor::new(&full_bytes);
+    let decoder = png::Decoder::new(cursor);
+    let mut reader = decoder.read_info().map_err(|e| format!("PNG decode: {e}"))?;
+    let mut img_buf = vec![0u8; reader.output_buffer_size()];
+    reader.next_frame(&mut img_buf).map_err(|e| format!("PNG frame: {e}"))?;
 
-        let mut bmi = BITMAPINFO {
-            bmiHeader: BITMAPINFOHEADER {
-                biSize: std::mem::size_of::<BITMAPINFOHEADER>() as u32,
-                biWidth: width as i32,
-                biHeight: -(height as i32),
-                biPlanes: 1,
-                biBitCount: 32,
-                biCompression: 0,
-                biSizeImage: 0,
-                biXPelsPerMeter: 0,
-                biYPelsPerMeter: 0,
-                biClrUsed: 0,
-                biClrImportant: 0,
-            },
-            bmiColors: [Default::default()],
-        };
+    // Clamp window rect to screen bounds
+    let x0 = (x.max(0) as u32).min(full_w);
+    let y0 = (y.max(0) as u32).min(full_h);
+    let x1 = ((x as u32 + w)).min(full_w);
+    let y1 = ((y as u32 + h)).min(full_h);
+    let cw = x1 - x0;
+    let ch = y1 - y0;
 
-        let mut pixel_buf: Vec<u8> = vec![0u8; (width * height * 4) as usize];
-        GetDIBits(hdc_mem, hbm, 0, height, Some(pixel_buf.as_mut_ptr() as *mut _), &mut bmi, DIB_RGB_COLORS);
-
-        SelectObject(hdc_mem, old_obj);
-        DeleteObject(hbm);
-        DeleteDC(hdc_mem);
-        ReleaseDC(None, hdc_screen);
-
-        // BGRA → RGBA
-        for chunk in pixel_buf.chunks_exact_mut(4) { chunk.swap(0, 2); }
-
-        let png_bytes = encode_png(&pixel_buf, width, height)?;
-        let b64 = base64::engine::general_purpose::STANDARD.encode(&png_bytes);
-        Ok((b64, width, height))
+    // Crop: 4 bytes per pixel (RGBA)
+    let mut cropped = Vec::with_capacity((cw * ch * 4) as usize);
+    for row in y0..y1 {
+        let start = ((row * full_w + x0) * 4) as usize;
+        let end = start + (cw * 4) as usize;
+        cropped.extend_from_slice(&img_buf[start..end]);
     }
+
+    let png_bytes = encode_png(&cropped, cw, ch)?;
+    let b64 = base64::engine::general_purpose::STANDARD.encode(&png_bytes);
+    Ok((b64, cw, ch))
 }
 
 #[cfg(not(windows))]

crates/client/src/windows_mgmt.rs

@@ -8,7 +8,7 @@ mod win_impl {
     use windows::Win32::Foundation::{BOOL, HWND, LPARAM};
     use windows::Win32::UI::WindowsAndMessaging::{
         BringWindowToTop, EnumWindows, GetWindowTextW, IsWindowVisible, SetForegroundWindow,
-        ShowWindow, SW_MAXIMIZE, SW_RESTORE,
+        ShowWindow, SW_MAXIMIZE, SW_MINIMIZE, SW_RESTORE,
     };
     use windows::Win32::UI::Input::KeyboardAndMouse::{
         keybd_event, KEYEVENTF_KEYUP, VK_MENU,