improve performance

1 files changed, 7 insertions, 3 deletions

diff --git a/core.c b/core.c
index 97e0288..97953b0 100644
--- a/core.c
+++ b/core.c
@@ -146,18 +146,22 @@ static void handle_events() {
 				switch (e.key.keysym.sym) {
 					case SDLK_RIGHT:
 						next_map();
+						refresh = true;
 						break;
 					case SDLK_LEFT:
 						prev_map();
+						refresh = true;
+						break;
+					default:
 						break;
 				}
 			default:
 				break;
 		}
 	}
-	render_pages(viewer, pos_x, pos_y,
-			screen_width, screen_height, scale, refresh);
-	SDL_RenderPresent(renderer);
+	if (render_pages(viewer, pos_x, pos_y,
+			screen_width, screen_height, scale, refresh))
+		SDL_RenderPresent(renderer);
 }
 
 void cleanup() {