Render optimization + fix resize bug

Cargo.lock

@@ -1,5 +1,5 @@
 [root]
-name = "neovim-gtk"
+name = "nvim-gtk"
 version = "0.1.1"
 dependencies = [
  "cairo-rs 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",

src/shell.rs

@@ -40,6 +40,7 @@ pub struct Shell {
     sp_color: Color,
     line_height: Option<f64>,
     char_width: Option<f64>,
+    request_width: bool,
     pub mode: NvimMode,
     mouse_enabled: bool,
     mouse_pressed: bool,
@@ -60,6 +61,7 @@ impl Shell {
             sp_color: COLOR_RED,
             line_height: None,
             char_width: None,
+            request_width: true,
             mode: NvimMode::Normal,
             mouse_enabled: true,
             mouse_pressed: false,
@@ -106,8 +108,14 @@ impl Shell {
         self.font_desc.clone()
     }
 
+    fn request_width(&mut self) {
+        self.request_width = true;
+    }
+
     pub fn set_font_desc(&mut self, desc: &str) {
         self.font_desc = FontDescription::from_string(desc);
+        self.line_height = None;
+        self.char_width = None;
     }
 
     pub fn colors<'a>(&'a self, cell: &'a Cell) -> (&'a Color, &'a Color) {
@@ -231,12 +239,15 @@ fn gtk_draw(_: &DrawingArea, ctx: &cairo::Context) -> Inhibit {
     UI.with(|ui_cell| {
         let mut ui = ui_cell.borrow_mut();
 
-        let (width, height) = calc_char_bounds(&ui.shell, ctx);
-        ui.shell.line_height = Some(height as f64);
-        ui.shell.char_width = Some(width as f64);
+        if ui.shell.line_height.is_none() {
+            let (width, height) = calc_char_bounds(&ui.shell, ctx);
+            ui.shell.line_height = Some(height as f64);
+            ui.shell.char_width = Some(width as f64);
+        }
 
         draw(&ui.shell, ctx);
-        request_width(&ui);
+
+        request_width(&mut ui);
     });
 
     Inhibit(false)
@@ -411,11 +422,16 @@ fn calc_char_bounds(shell: &Shell, ctx: &cairo::Context) -> (i32, i32) {
     layout.get_pixel_size()
 }
 
-fn request_width(ui: &Ui) {
+fn request_width(ui: &mut Ui) {
+    if !ui.shell.request_width {
+        return;
+    }
     if ui.shell.resize_timer.is_some() {
         return;
     }
 
+    ui.shell.request_width = false;
+
     let width = ui.shell.drawing_area.get_allocated_width();
     let height = ui.shell.drawing_area.get_allocated_height();
     let request_height = (ui.shell.model.rows as f64 * ui.shell.line_height.unwrap()) as i32;
@@ -459,6 +475,7 @@ fn gtk_configure_event(_: &DrawingArea, ev: &EventConfigure) -> bool {
                                 println!("Error trying resize nvim {}", err);
                             }
                         }
+                        shell.request_width();
                     });
                     Continue(false)
                 }));

src/ui_model.rs

@@ -310,7 +310,7 @@ impl ModelRect {
                      y2: f64)
                      -> ModelRect {
         let x1 = if x1 > 0.0 {
-            x1 - 1.0
+            x1 // - 1.0
         } else {
             x1
         };
@@ -320,7 +320,7 @@ impl ModelRect {
             x2
         };
         let y1 = if y1 > 0.0 {
-            y1 - 1.0
+            y1 // - 1.0
         } else {
             y1
         };