implement dirty row trackingdirty-rows

not merging this to master because it actually ends up being ~5-10%
slower - not entirely sure why. should look into it at some point.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/display.c b/src/display.c
index 02e7d1a..232e658 100644
--- a/src/display.c
+++ b/src/display.c
@@ -95,10 +95,14 @@ void runes_display_draw_screen(RunesTerm *t)
 
     /* XXX quite inefficient */
     for (r = 0; r < t->scr.max.row; ++r) {
-        int c = 0;
+        if (t->scr.rows[r].dirty) {
+            int c = 0;
 
-        while (c < t->scr.max.col) {
-            c += runes_display_draw_cell(t, r, c);
+            while (c < t->scr.max.col) {
+                c += runes_display_draw_cell(t, r, c);
+            }
+
+            t->scr.rows[r].dirty = 0;
         }
     }
     runes_window_backend_request_flush(t);