Dont draw fat pixels outside of spritesheet

nasu.c

@@ -303,9 +303,10 @@ redraw(Uint32 *dst)
 	drawui(dst);
 	for(y = 0; y < VER; ++y)
 		for(x = 0; x < HOR; ++x)
-			if(BIGPIXEL)
-				drawbigchr(dst, x, y, getchr(x + brush.vx, y + brush.vy));
-			else
+			if(BIGPIXEL) {
+				if(x + brush.vx < HOR * 8 && y + brush.vy < VER * 8)
+					drawbigchr(dst, x, y, getchr(x + brush.vx, y + brush.vy));
+			} else
 				drawchr(dst, x, y, x + y * HOR);
 	SDL_UpdateTexture(gTexture, NULL, dst, WIDTH * sizeof(Uint32));
 	SDL_RenderClear(gRenderer);