X11: Assume 96 DPI if RandR monitor size is zero

From upstream: https://github.com/glfw/glfw/commit/e96dc5d2199032d565b55c4177820ab28b1d67c9.
2019-11-22 02:07:34 +01:00
parent 4ea72a2892
commit d6072f6218
1 changed files with 10 additions and 0 deletions
@@ -166,6 +166,16 @@ void _glfwPollMonitorsX11(void)
                heightMM = oi->mm_height;
            }

+            if (widthMM <= 0 || heightMM <= 0)
+            {
+                // HACK: If RandR does not provide a physical size, assume the
+                //       X11 default 96 DPI and calcuate from the CRTC viewport
+                // NOTE: These members are affected by rotation, unlike the mode
+                //       info and output info members
+                widthMM  = (int) (ci->width * 25.4f / 96.f);
+                heightMM = (int) (ci->height * 25.4f / 96.f);
+            }
+
            _GLFWmonitor* monitor = _glfwAllocMonitor(oi->name, widthMM, heightMM);
            monitor->x11.output = sr->outputs[i];
            monitor->x11.crtc   = oi->crtc;