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| 1 | +//! Multi-monitor detection using XRandR |
| 2 | +//! |
| 3 | +//! Detects connected monitors and their positions for proper UI placement. |
| 4 | + |
| 5 | +use anyhow::{Context, Result}; |
| 6 | +use x11rb::connection::Connection; |
| 7 | +use x11rb::protocol::randr::{self, ConnectionExt as RandrConnectionExt}; |
| 8 | +use x11rb::protocol::xproto::Window; |
| 9 | +use x11rb::rust_connection::RustConnection; |
| 10 | + |
| 11 | +/// Information about a connected monitor |
| 12 | +#[derive(Debug, Clone)] |
| 13 | +pub struct Monitor { |
| 14 | + /// X position in virtual screen |
| 15 | + pub x: i16, |
| 16 | + /// Y position in virtual screen |
| 17 | + pub y: i16, |
| 18 | + /// Width in pixels |
| 19 | + pub width: u16, |
| 20 | + /// Height in pixels |
| 21 | + pub height: u16, |
| 22 | + /// Whether this is the primary monitor |
| 23 | + pub primary: bool, |
| 24 | + /// Monitor name (e.g., "DP-1", "HDMI-A-1") |
| 25 | + pub name: String, |
| 26 | +} |
| 27 | + |
| 28 | +impl Monitor { |
| 29 | + /// Get the center X coordinate of this monitor |
| 30 | + pub fn center_x(&self) -> f64 { |
| 31 | + self.x as f64 + self.width as f64 / 2.0 |
| 32 | + } |
| 33 | + |
| 34 | + /// Get the center Y coordinate of this monitor |
| 35 | + pub fn center_y(&self) -> f64 { |
| 36 | + self.y as f64 + self.height as f64 / 2.0 |
| 37 | + } |
| 38 | +} |
| 39 | + |
| 40 | +/// Detected monitor configuration |
| 41 | +#[derive(Debug, Clone)] |
| 42 | +pub struct MonitorConfig { |
| 43 | + /// All connected monitors |
| 44 | + pub monitors: Vec<Monitor>, |
| 45 | + /// Total virtual screen width |
| 46 | + pub total_width: u16, |
| 47 | + /// Total virtual screen height |
| 48 | + pub total_height: u16, |
| 49 | +} |
| 50 | + |
| 51 | +impl MonitorConfig { |
| 52 | + /// Detect monitors using RandR |
| 53 | + pub fn detect(conn: &RustConnection, root: Window) -> Result<Self> { |
| 54 | + // Get screen resources |
| 55 | + let resources = conn |
| 56 | + .randr_get_screen_resources(root) |
| 57 | + .context("Failed to get screen resources")? |
| 58 | + .reply() |
| 59 | + .context("Failed to get screen resources reply")?; |
| 60 | + |
| 61 | + // Get primary output |
| 62 | + let primary_output = conn |
| 63 | + .randr_get_output_primary(root) |
| 64 | + .context("Failed to get primary output")? |
| 65 | + .reply() |
| 66 | + .context("Failed to get primary output reply")? |
| 67 | + .output; |
| 68 | + |
| 69 | + let mut monitors = Vec::new(); |
| 70 | + |
| 71 | + for output in &resources.outputs { |
| 72 | + let output_info = match conn.randr_get_output_info(*output, 0) { |
| 73 | + Ok(cookie) => match cookie.reply() { |
| 74 | + Ok(info) => info, |
| 75 | + Err(_) => continue, |
| 76 | + }, |
| 77 | + Err(_) => continue, |
| 78 | + }; |
| 79 | + |
| 80 | + // Skip disconnected outputs |
| 81 | + if output_info.connection != randr::Connection::CONNECTED { |
| 82 | + continue; |
| 83 | + } |
| 84 | + |
| 85 | + // Skip outputs without a CRTC (not active) |
| 86 | + let crtc = match output_info.crtc { |
| 87 | + 0 => continue, |
| 88 | + c => c, |
| 89 | + }; |
| 90 | + |
| 91 | + let crtc_info = match conn.randr_get_crtc_info(crtc, 0) { |
| 92 | + Ok(cookie) => match cookie.reply() { |
| 93 | + Ok(info) => info, |
| 94 | + Err(_) => continue, |
| 95 | + }, |
| 96 | + Err(_) => continue, |
| 97 | + }; |
| 98 | + |
| 99 | + // Skip CRTCs with zero dimensions |
| 100 | + if crtc_info.width == 0 || crtc_info.height == 0 { |
| 101 | + continue; |
| 102 | + } |
| 103 | + |
| 104 | + let name = String::from_utf8_lossy(&output_info.name).to_string(); |
| 105 | + let is_primary = *output == primary_output; |
| 106 | + |
| 107 | + monitors.push(Monitor { |
| 108 | + x: crtc_info.x, |
| 109 | + y: crtc_info.y, |
| 110 | + width: crtc_info.width, |
| 111 | + height: crtc_info.height, |
| 112 | + primary: is_primary, |
| 113 | + name, |
| 114 | + }); |
| 115 | + } |
| 116 | + |
| 117 | + // Calculate total virtual screen size |
| 118 | + let (total_width, total_height) = if monitors.is_empty() { |
| 119 | + // Fallback to root window size |
| 120 | + let screen = &conn.setup().roots[0]; |
| 121 | + (screen.width_in_pixels, screen.height_in_pixels) |
| 122 | + } else { |
| 123 | + let max_x = monitors |
| 124 | + .iter() |
| 125 | + .map(|m| m.x as i32 + m.width as i32) |
| 126 | + .max() |
| 127 | + .unwrap_or(0); |
| 128 | + let max_y = monitors |
| 129 | + .iter() |
| 130 | + .map(|m| m.y as i32 + m.height as i32) |
| 131 | + .max() |
| 132 | + .unwrap_or(0); |
| 133 | + (max_x as u16, max_y as u16) |
| 134 | + }; |
| 135 | + |
| 136 | + // If no primary is set, mark the largest monitor as primary |
| 137 | + if !monitors.iter().any(|m| m.primary) && !monitors.is_empty() { |
| 138 | + let largest_idx = monitors |
| 139 | + .iter() |
| 140 | + .enumerate() |
| 141 | + .max_by_key(|(_, m)| m.width as u32 * m.height as u32) |
| 142 | + .map(|(i, _)| i) |
| 143 | + .unwrap_or(0); |
| 144 | + monitors[largest_idx].primary = true; |
| 145 | + } |
| 146 | + |
| 147 | + tracing::info!( |
| 148 | + count = monitors.len(), |
| 149 | + total_width, |
| 150 | + total_height, |
| 151 | + "Detected monitors" |
| 152 | + ); |
| 153 | + |
| 154 | + for monitor in &monitors { |
| 155 | + tracing::debug!( |
| 156 | + name = %monitor.name, |
| 157 | + x = monitor.x, |
| 158 | + y = monitor.y, |
| 159 | + width = monitor.width, |
| 160 | + height = monitor.height, |
| 161 | + primary = monitor.primary, |
| 162 | + "Monitor" |
| 163 | + ); |
| 164 | + } |
| 165 | + |
| 166 | + Ok(Self { |
| 167 | + monitors, |
| 168 | + total_width, |
| 169 | + total_height, |
| 170 | + }) |
| 171 | + } |
| 172 | + |
| 173 | + /// Get the primary monitor |
| 174 | + pub fn primary(&self) -> Option<&Monitor> { |
| 175 | + self.monitors.iter().find(|m| m.primary) |
| 176 | + } |
| 177 | + |
| 178 | + /// Get the primary monitor, or the first one if no primary |
| 179 | + pub fn primary_or_first(&self) -> Option<&Monitor> { |
| 180 | + self.primary().or_else(|| self.monitors.first()) |
| 181 | + } |
| 182 | + |
| 183 | + /// Check if this is a single-monitor setup |
| 184 | + pub fn is_single_monitor(&self) -> bool { |
| 185 | + self.monitors.len() <= 1 |
| 186 | + } |
| 187 | +} |
| 188 | + |
| 189 | +/// Fallback monitor config when RandR fails |
| 190 | +pub fn fallback_config(screen_width: u16, screen_height: u16) -> MonitorConfig { |
| 191 | + MonitorConfig { |
| 192 | + monitors: vec![Monitor { |
| 193 | + x: 0, |
| 194 | + y: 0, |
| 195 | + width: screen_width, |
| 196 | + height: screen_height, |
| 197 | + primary: true, |
| 198 | + name: "default".to_string(), |
| 199 | + }], |
| 200 | + total_width: screen_width, |
| 201 | + total_height: screen_height, |
| 202 | + } |
| 203 | +} |