Add iterator methods to Grid and Row types

The iterator methods simplify logic in the main grid render function. To
disambiguate iterator methods from those returning counts (and to free
up names), the `rows()` and `cols()` methods on `Grid` have been renamed
to `num_rows()` and `num_cols()`, respectively.

1 files changed, 12 insertions, 8 deletions

diff --git a/src/renderer/mod.rs b/src/renderer/mod.rs
index c983beba..2ba5b94c 100644
--- a/src/renderer/mod.rs
+++ b/src/renderer/mod.rs
@@ -182,17 +182,21 @@ impl QuadRenderer {
 
     pub fn render_grid(&mut self, grid: &Grid, glyph_cache: &GlyphCache, props: &TermProps) {
         self.prepare_render(props);
-        for i in 0..grid.rows() {
-            let row = &grid[i];
-            for j in 0..row.cols() {
-                let cell = &row[j];
-                if cell.c != ' ' {
-                    if let Some(glyph) = glyph_cache.get(&cell.c) {
-                        self.render(glyph, i as f32, j as f32, &cell.fg, cell.c);
-                    }
+
+        for (i, row) in grid.rows().enumerate() {
+            for (j, cell) in row.cells().enumerate() {
+                // Skip empty cells
+                if cell.c == ' ' {
+                    continue;
+                }
+
+                // Render if glyph is loaded
+                if let Some(glyph) = glyph_cache.get(&cell.c) {
+                    self.render(glyph, i as f32, j as f32, &cell.fg, cell.c);
                 }
             }
         }
+
         self.finish_render();
     }