From 832d9e1bed83a69324180a6e45b02586b9bdfcd2 Mon Sep 17 00:00:00 2001
From: toluschr <toluschr@protonmail.com>
Date: Tue, 24 May 2022 11:09:58 +0200
Subject: [PATCH] Fix zathura not rendering on hidpi displays

Related to https://gitlab.gnome.org/GNOME/gtk/-/issues/3115.
Ideally, GNOME could fix their library to return 0 instead of 1.
---
 zathura/zathura.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/zathura/zathura.c b/zathura/zathura.c
index e1ed652..244169f 100644
--- a/zathura/zathura.c
+++ b/zathura/zathura.c
@@ -173,10 +173,12 @@ zathura_update_view_ppi(zathura_t* zathura)
   GdkRectangle monitor_geom;
   gdk_monitor_get_geometry(monitor, &monitor_geom);
 
-  /* calculate ppi, knowing that 1 inch = 25.4 mm */
-  if (width_mm == 0) {
+  /* Due to a bug in Gtk, width is sometimes incorrectly reported to be 1mm
+   * see https://gitlab.gnome.org/GNOME/gtk/issues/3115 for details */
+  if (width_mm <= 1) {
     girara_debug("cannot calculate PPI: monitor has zero width");
   } else {
+    /* calculate ppi, knowing that 1 inch = 25.4 mm */
     ppi = monitor_geom.width * 25.4 / width_mm;
   }