From 364b447ee4c70eb5de934937d4da8e68afc5678b Mon Sep 17 00:00:00 2001
From: Xie Yi <wez733@live.cn>
Date: Tue, 11 Jun 2019 14:04:18 +0800
Subject: [PATCH] Simple dpi scaling

---
 ios/DisplayManager.mm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ios/DisplayManager.mm b/ios/DisplayManager.mm
index bdaafd48bd..94a7a69bad 100644
--- a/ios/DisplayManager.mm
+++ b/ios/DisplayManager.mm
@@ -135,7 +135,12 @@
 		size.width = h;
 	}
 	
-	g_dpi = (IS_IPAD() ? 200.0f : 150.0f) * scale;
+	if (screen == [UIScreen mainScreen]) {
+		g_dpi = (IS_IPAD() ? 200.0f : 150.0f) * scale;
+	} else {
+		float diagonal = sqrt(size.height * size.height + size.width * size.width);
+		g_dpi = diagonal * scale * 0.1f;
+	}
 	g_dpi_scale_x = 240.0f / g_dpi;
 	g_dpi_scale_y = 240.0f / g_dpi;
 	g_dpi_scale_real_x = g_dpi_scale_x;