fix: reduce scroll CPU in headless server

refs #512

1 files changed, 27 insertions, 0 deletions

diff --git a/src/pane/terminal.rs b/src/pane/terminal.rs
index fa281553..d697f76d 100644
--- a/src/pane/terminal.rs
+++ b/src/pane/terminal.rs
@@ -183,6 +183,10 @@ impl PaneTerminal {
         self.ghostty.input_state()
     }
 
+    pub fn wheel_routing(&self) -> Option<crate::pane::WheelRouting> {
+        self.ghostty.wheel_routing()
+    }
+
     pub fn cursor_state(&self) -> Option<TerminalCursorState> {
         self.ghostty.cursor_state()
     }
@@ -870,6 +874,29 @@ impl GhosttyPaneTerminal {
         })
     }
 
+    pub fn wheel_routing(&self) -> Option<crate::pane::WheelRouting> {
+        let Ok(core) = self.core.lock() else {
+            return None;
+        };
+        let alternate_screen =
+            core.terminal.active_screen().ok()? == crate::ghostty::ActiveScreen::Alternate;
+        let mouse_alternate_scroll = core
+            .terminal
+            .mode_get(crate::ghostty::MODE_MOUSE_ALTERNATE_SCROLL)
+            .ok()?;
+        let mouse_reporting = core.terminal.mode_get(MODE_MOUSE_ANY_MOTION).ok()?
+            || core.terminal.mode_get(MODE_MOUSE_BUTTON_MOTION).ok()?
+            || core.terminal.mode_get(MODE_MOUSE_PRESS_RELEASE).ok()?
+            || core.terminal.mode_get(MODE_MOUSE_X10).ok()?;
+        Some(if mouse_reporting {
+            crate::pane::WheelRouting::MouseReport
+        } else if alternate_screen && mouse_alternate_scroll {
+            crate::pane::WheelRouting::AlternateScroll
+        } else {
+            crate::pane::WheelRouting::HostScroll
+        })
+    }
+
     pub fn cursor_state(&self) -> Option<TerminalCursorState> {
         let mut core = self.core.lock().ok()?;
         let GhosttyPaneCore {