From ae43f9facbfa756915989dcd7ddd7b3497ffa323 Mon Sep 17 00:00:00 2001
From: Alexander Larsson <alexl@redhat.com>
Date: Thu, 20 Jun 2013 18:43:42 +0200
Subject: [PATCH] Add GDK_DPI_SCALE env var

This is very useful for hidpi where the dpi is scaled to make
non-dpi aware apps larger. In that case a dpi aware gtk+ using
GDK_SCALE will be getting huge fonts. You can the set GDK_DPI_SCALE
to compensate for this.
---
 gtk/gtksettings.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gtk/gtksettings.c b/gtk/gtksettings.c
index ab96154f1a..47e3d2afe4 100644
--- a/gtk/gtksettings.c
+++ b/gtk/gtksettings.c
@@ -2810,6 +2810,8 @@ settings_update_resolution (GtkSettings *settings)
   GtkSettingsPrivate *priv = settings->priv;
   gint dpi_int;
   gdouble dpi;
+  const char *scale_env;
+  double scale;
 
   g_object_get (settings,
                 "gtk-xft-dpi", &dpi_int,
@@ -2820,6 +2822,14 @@ settings_update_resolution (GtkSettings *settings)
   else
     dpi = -1.;
 
+  scale_env = g_getenv ("GDK_DPI_SCALE");
+  if (scale_env)
+    {
+      scale = g_ascii_strtod (scale_env, NULL);
+      if (scale != 0 && dpi > 0)
+	dpi *= scale;
+    }
+
   gdk_screen_set_resolution (priv->screen, dpi);
 }
 
-- 
2.30.2