---
 left.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/left.c b/left.c
index 0f1b911..538cd64 100644
--- a/left.c
+++ b/left.c
@@ -625,6 +625,7 @@ modzoom(int mod)
 	if((mod > 0 && ZOOM < 5) || (mod < 0 && ZOOM > 1)) {
 		ZOOM += mod;
 		SDL_SetWindowSize(gWindow, WIDTH * ZOOM, HEIGHT * ZOOM);
+		redraw(pixels);
 	}
 }
 
-- 
2.29.2

---
 left.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/left.c b/left.c
index 538cd64..ed2a5f6 100644
--- a/left.c
+++ b/left.c
@@ -34,7 +34,8 @@ typedef struct {
 
 int WIDTH = 8 * HOR + 8 * PAD * 2;
 int HEIGHT = 8 * (VER + 2) + 8 * PAD * 2;
-int FPS = 30, GUIDES = 1, ZOOM = 2, DOWN = 0;
+int FPS = 30, GUIDES = 1, DOWN = 0;
+float ZOOM = 1;
 int RULER = 60;
 
 /* interface */
@@ -620,9 +621,9 @@ modcase(Range s, int mod)
 }
 
 void
-modzoom(int mod)
+modzoom(float mod)
 {
-	if((mod > 0 && ZOOM < 5) || (mod < 0 && ZOOM > 1)) {
+	if((mod > 0 && ZOOM < 5) || (mod < 0 && ZOOM > 0.5)) {
 		ZOOM += mod;
 		SDL_SetWindowSize(gWindow, WIDTH * ZOOM, HEIGHT * ZOOM);
 		redraw(pixels);
@@ -772,12 +773,12 @@ dokey(SDL_Event *event)
 	case SDLK_EQUALS:
 	case SDLK_PLUS:
 		if(ctrl)
-			modzoom(1);
+			modzoom(.5);
 		break;
 	case SDLK_UNDERSCORE:
 	case SDLK_MINUS:
 		if(ctrl)
-			modzoom(-1);
+			modzoom(-.5);
 		break;
 	case SDLK_LEFT:
 		if(ctrl)
@@ -889,7 +890,7 @@ init(void)
 		SDL_WINDOWPOS_UNDEFINED,
 		WIDTH * ZOOM,
 		HEIGHT * ZOOM,
-		SDL_WINDOW_SHOWN);
+		SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI);
 	if(gWindow == NULL)
 		return error("Window", SDL_GetError());
 	gRenderer = SDL_CreateRenderer(gWindow, -1, 0);
-- 
2.29.2