Move text area bounds outside run/glyph loops (#110)

Author: grovesNL

src/text_render.rs

@@ -60,14 +60,21 @@ impl TextRenderer {
         let resolution = viewport.resolution();
 
         for text_area in text_areas {
+            let bounds_min_x = text_area.bounds.left.max(0);
+            let bounds_min_y = text_area.bounds.top.max(0);
+            let bounds_max_x = text_area.bounds.right.min(resolution.width as i32);
+            let bounds_max_y = text_area.bounds.bottom.min(resolution.height as i32);
+
             let is_run_visible = |run: &cosmic_text::LayoutRun| {
                 let start_y = (text_area.top + run.line_top) as i32;
                 let end_y = (text_area.top + run.line_top + run.line_height) as i32;
 
-                start_y <= text_area.bounds.bottom && text_area.bounds.top <= end_y
+                start_y <= bounds_max_y && bounds_min_y <= end_y
             };
 
-            let layout_runs = text_area.buffer.layout_runs()
+            let layout_runs = text_area
+                .buffer
+                .layout_runs()
                 .skip_while(|run| !is_run_visible(run))
                 .take_while(is_run_visible);
 
@@ -198,11 +205,6 @@ impl TextRenderer {
                     let mut width = details.width as i32;
                     let mut height = details.height as i32;
 
-                    let bounds_min_x = text_area.bounds.left.max(0);
-                    let bounds_min_y = text_area.bounds.top.max(0);
-                    let bounds_max_x = text_area.bounds.right.min(resolution.width as i32);
-                    let bounds_max_y = text_area.bounds.bottom.min(resolution.height as i32);
-
                     // Starts beyond right edge or ends beyond left edge
                     let max_x = x + width;
                     if x > bounds_max_x || max_x < bounds_min_x {