[gtk+/wip/otte/gtk4: 30/127] fontchooserwidget: Query dpi from CssStyle

[Benjamin Otte <otte src gnome org>]

commit a707eda842ddb7bd4159b38b64e88c33f7724a0a
Author: Benjamin Otte <otte redhat com>
Date:   Fri Sep 30 05:11:19 2016 +0200

    fontchooserwidget: Query dpi from CssStyle

 gtk/gtkfontchooserwidget.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkfontchooserwidget.c b/gtk/gtkfontchooserwidget.c
index b7fbef1..afccbdc 100644
--- a/gtk/gtkfontchooserwidget.c
+++ b/gtk/gtkfontchooserwidget.c
@@ -29,6 +29,7 @@
 #include "gtkbuildable.h"
 #include "gtkbox.h"
 #include "gtkcellrenderertext.h"
+#include "gtkcssnumbervalueprivate.h"
 #include "gtkentry.h"
 #include "gtksearchentry.h"
 #include "gtkgrid.h"
@@ -42,6 +43,7 @@
 #include "gtkscale.h"
 #include "gtkscrolledwindow.h"
 #include "gtkspinbutton.h"
+#include "gtkstylecontextprivate.h"
 #include "gtktextview.h"
 #include "gtktreeselection.h"
 #include "gtktreeview.h"
@@ -842,10 +844,14 @@ static int
 gtk_font_chooser_widget_get_preview_text_height (GtkFontChooserWidget *fontchooser)
 {
   GtkWidget *treeview = fontchooser->priv->family_face_list;
+  GtkStyleContext *context;
   double dpi, font_size;
 
-  dpi = gdk_screen_get_resolution (gtk_widget_get_screen (treeview));
-  gtk_style_context_get (gtk_widget_get_style_context (treeview),
+  context = gtk_widget_get_style_context (treeview);
+  dpi = _gtk_css_number_value_get (_gtk_style_context_peek_property (context,
+                                                                     GTK_CSS_PROPERTY_DPI),
+                                   100);
+  gtk_style_context_get (context,
                          gtk_widget_get_state_flags (treeview),
                          "font-size", &font_size,
                          NULL);