From 411e3493583b5692aa3749b21e5b79e70f10055e Mon Sep 17 00:00:00 2001
From: Konstantinos Chatzilygeroudis <costashatz@gmail.com>
Date: Thu, 7 Nov 2019 13:24:53 +0100
Subject: [PATCH] GlfwApplication: Workaround for DPI scaling when monitor size
 is equal to zero

---
 src/Magnum/Platform/GlfwApplication.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Magnum/Platform/GlfwApplication.cpp b/src/Magnum/Platform/GlfwApplication.cpp
index bc73a5e23..ee9f3a17d 100644
--- a/src/Magnum/Platform/GlfwApplication.cpp
+++ b/src/Magnum/Platform/GlfwApplication.cpp
@@ -181,6 +181,10 @@ Vector2 GlfwApplication::dpiScaling(const Configuration& configuration) const {
         const GLFWvidmode* const mode = glfwGetVideoMode(monitor);
         Vector2i monitorSize;
         glfwGetMonitorPhysicalSize(monitor, &monitorSize.x(), &monitorSize.y());
+        if(monitorSize.isZero()) {
+            Warning{verbose} << "Platform::GlfwApplication: the physical monitor size is zero? DPI scaling won't be used";
+            return Vector2{1.0f};
+        }
         auto dpi = Vector2{Vector2i{mode->width, mode->height}*25.4f/Vector2{monitorSize}};
         const Vector2 dpiScaling{dpi/96.0f};
         Debug{verbose} << "Platform::GlfwApplication: virtual DPI scaling" << dpiScaling;
@@ -205,6 +209,10 @@ Vector2 GlfwApplication::dpiScaling(const Configuration& configuration) const {
     const GLFWvidmode* const mode = glfwGetVideoMode(monitor);
     Vector2i monitorSize;
     glfwGetMonitorPhysicalSize(monitor, &monitorSize.x(), &monitorSize.y());
+    if(monitorSize.isZero()) {
+        Warning{verbose} << "Platform::GlfwApplication: the physical monitor size is zero? DPI scaling won't be used";
+        return Vector2{1.0f};
+    }
     auto dpi = Vector2{Vector2i{mode->width, mode->height}*25.4f/Vector2{monitorSize}};
     const Vector2 dpiScaling{dpi/96.0f};
     Debug{verbose} << "Platform::GlfwApplication: physical DPI scaling" << dpiScaling;