From 0ef149c8f2451fbc8e866834675a075cfc295b6c Mon Sep 17 00:00:00 2001
From: Nicolas Caramelli <caramelli.devel@gmail.com>
Date: Wed, 14 Oct 2020 10:25:46 +0200
Subject: [PATCH] Wayland: Assume 96 DPI if physical size is <= 0

---
 src/wl_init.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/wl_init.c b/src/wl_init.c
index 21a808aa..d3e777d4 100644
--- a/src/wl_init.c
+++ b/src/wl_init.c
@@ -1038,6 +1038,8 @@ int _glfwPlatformInit(void)
     char *cursorSizeEnd;
     long cursorSizeLong;
     int cursorSize;
+    int i;
+    _GLFWmonitor* monitor;
 
     _glfw.wl.cursor.handle = _glfw_dlopen("libwayland-cursor.so.0");
     if (!_glfw.wl.cursor.handle)
@@ -1146,6 +1148,17 @@ int _glfwPlatformInit(void)
     // Sync so we got all initial output events
     wl_display_roundtrip(_glfw.wl.display);
 
+    for (i = 0; i < _glfw.monitorCount; ++i)
+    {
+        monitor = _glfw.monitors[i];
+        if (monitor->widthMM <= 0 || monitor->heightMM <= 0)
+        {
+            // If Wayland does not provide a physical size, assume the default 96 DPI
+            monitor->widthMM  = (int) (monitor->modes[monitor->wl.currentMode].width * 25.4f / 96.f);
+            monitor->heightMM = (int) (monitor->modes[monitor->wl.currentMode].height * 25.4f / 96.f);
+        }
+    }
+
     _glfwInitTimerPOSIX();
 
     _glfw.wl.timerfd = -1;