Initial GuruConnect implementation - Phase 1 MVP

- Agent: DXGI/GDI screen capture, mouse/keyboard input, WebSocket transport
- Server: Axum relay, session management, REST API
- Dashboard: React viewer components with TypeScript
- Protocol: Protobuf definitions for all message types

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

agent/src/capture/mod.rs

@@ -0,0 +1,102 @@
+//! Screen capture module
+//!
+//! Provides DXGI Desktop Duplication for high-performance screen capture on Windows 8+,
+//! with GDI fallback for legacy systems or edge cases.
+
+#[cfg(windows)]
+mod dxgi;
+#[cfg(windows)]
+mod gdi;
+mod display;
+
+pub use display::{Display, DisplayInfo};
+
+use anyhow::Result;
+use std::time::Instant;
+
+/// Captured frame data
+#[derive(Debug)]
+pub struct CapturedFrame {
+    /// Frame width in pixels
+    pub width: u32,
+
+    /// Frame height in pixels
+    pub height: u32,
+
+    /// Raw BGRA pixel data (4 bytes per pixel)
+    pub data: Vec<u8>,
+
+    /// Timestamp when frame was captured
+    pub timestamp: Instant,
+
+    /// Display ID this frame is from
+    pub display_id: u32,
+
+    /// Regions that changed since last frame (if available)
+    pub dirty_rects: Option<Vec<DirtyRect>>,
+}
+
+/// Rectangular region that changed
+#[derive(Debug, Clone, Copy)]
+pub struct DirtyRect {
+    pub x: u32,
+    pub y: u32,
+    pub width: u32,
+    pub height: u32,
+}
+
+/// Screen capturer trait
+pub trait Capturer: Send {
+    /// Capture the next frame
+    ///
+    /// Returns None if no new frame is available (screen unchanged)
+    fn capture(&mut self) -> Result<Option<CapturedFrame>>;
+
+    /// Get the current display info
+    fn display(&self) -> &Display;
+
+    /// Check if capturer is still valid (display may have changed)
+    fn is_valid(&self) -> bool;
+}
+
+/// Create a capturer for the specified display
+#[cfg(windows)]
+pub fn create_capturer(display: Display, use_dxgi: bool, gdi_fallback: bool) -> Result<Box<dyn Capturer>> {
+    if use_dxgi {
+        match dxgi::DxgiCapturer::new(display.clone()) {
+            Ok(capturer) => {
+                tracing::info!("Using DXGI Desktop Duplication for capture");
+                return Ok(Box::new(capturer));
+            }
+            Err(e) => {
+                tracing::warn!("DXGI capture failed: {}, trying fallback", e);
+                if !gdi_fallback {
+                    return Err(e);
+                }
+            }
+        }
+    }
+
+    // GDI fallback
+    tracing::info!("Using GDI for capture");
+    Ok(Box::new(gdi::GdiCapturer::new(display)?))
+}
+
+#[cfg(not(windows))]
+pub fn create_capturer(_display: Display, _use_dxgi: bool, _gdi_fallback: bool) -> Result<Box<dyn Capturer>> {
+    anyhow::bail!("Screen capture only supported on Windows")
+}
+
+/// Get all available displays
+pub fn enumerate_displays() -> Result<Vec<Display>> {
+    display::enumerate_displays()
+}
+
+/// Get the primary display
+pub fn primary_display() -> Result<Display> {
+    let displays = enumerate_displays()?;
+    displays
+        .into_iter()
+        .find(|d| d.is_primary)
+        .ok_or_else(|| anyhow::anyhow!("No primary display found"))
+}