feat(webgl2): add cell_size() and set_size() to WebGl2Backend (#164)

Author: junkdog

Cargo.lock

@@ -44,7 +44,7 @@ ratatui = { version = "0.30", default-features = false, features = ["all-widgets
 console_error_panic_hook = "0.1.7"
 thiserror = "2.0.18"
 bitvec = { version = "1.0.1", default-features = false, features = ["alloc", "std"] }
-beamterm-renderer = "0.15.0"
+beamterm-renderer = "0.16.0"
 unicode-width = "0.2.2"
 
 [dev-dependencies]

Cargo.toml

@@ -427,6 +427,27 @@ impl WebGl2Backend {
         Ok(())
     }
 
+    /// Returns the cell size in physical pixels at the current device
+    /// pixel ratio.
+    ///
+    /// For static atlases, this is the cell size from the atlas data.
+    /// For dynamic atlases, this is measured from the rasterized font.
+    pub fn cell_size(&self) -> (i32, i32) {
+        self.beamterm.cell_size()
+    }
+
+    /// Resizes the canvas and terminal grid to the specified logical pixel dimensions.
+    ///
+    /// This updates the canvas buffer, CSS display size (if auto-resize is enabled),
+    /// viewport, and recalculates the terminal grid dimensions based on the current
+    /// cell size.
+    pub fn set_size(&mut self, width: u32, height: u32) -> Result<(), Error> {
+        self.beamterm.resize(width as i32, height as i32)?;
+        self.cursor_over_hyperlink = false;
+        self.update_mouse_handler_metrics();
+        Ok(())
+    }
+
     /// Updates metrics on externally-managed mouse handlers after resize or DPR changes.
     ///
     /// Beamterm's `Terminal::resize()` only updates its own internal mouse handler.