[gtk+] font button: Convert from pango to css properly

[Matthias Clasen <matthiasc src gnome org>]

commit 99c2423043f0c95a60093c618e00823e42e0ddfa
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Apr 18 15:04:37 2016 -0400

    font button: Convert from pango to css properly
    
    This utility function should probably find a home somewhere else.
    For now, this makes the deprecation warning go away.

 gtk/gtkfontbutton.c |  129 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 123 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index 91a0f98..82021b8 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -1164,6 +1164,127 @@ dialog_destroy (GtkWidget *widget,
   font_button->priv->font_dialog = NULL;
 } 
 
+static gchar *
+pango_font_description_to_css (PangoFontDescription *desc)
+{
+  GString *s;
+  PangoFontMask set;
+
+  s = g_string_new ("* { ");
+
+  set = pango_font_description_get_set_fields (desc);
+  if (set & PANGO_FONT_MASK_FAMILY)
+    {
+      g_string_append (s, "font-family: ");
+      g_string_append (s, pango_font_description_get_family (desc));
+      g_string_append (s, "; ");
+    }
+  if (set & PANGO_FONT_MASK_STYLE)
+    {
+      switch (pango_font_description_get_style (desc))
+        {
+        case PANGO_STYLE_NORMAL:
+          g_string_append (s, "font-style: normal; ");
+          break;
+        case PANGO_STYLE_OBLIQUE:
+          g_string_append (s, "font-style: oblique; ");
+          break;
+        case PANGO_STYLE_ITALIC:
+          g_string_append (s, "font-style: italic; ");
+          break;
+        }
+    }
+  if (set & PANGO_FONT_MASK_VARIANT)
+    {
+      switch (pango_font_description_get_variant (desc))
+        {
+        case PANGO_VARIANT_NORMAL:
+          g_string_append (s, "font-variant: normal; ");
+          break;
+        case PANGO_VARIANT_SMALL_CAPS:
+          g_string_append (s, "font-variant: small-caps; ");
+          break;
+        }
+    }
+  if (set & PANGO_FONT_MASK_WEIGHT)
+    {
+      switch (pango_font_description_get_weight (desc))
+        {
+        case PANGO_WEIGHT_THIN:
+          g_string_append (s, "font-weight: 100; ");
+          break;
+        case PANGO_WEIGHT_ULTRALIGHT:
+          g_string_append (s, "font-weight: 200; ");
+          break;
+        case PANGO_WEIGHT_LIGHT:
+        case PANGO_WEIGHT_SEMILIGHT:
+          g_string_append (s, "font-weight: 300; ");
+          break;
+        case PANGO_WEIGHT_BOOK:
+        case PANGO_WEIGHT_NORMAL:
+          g_string_append (s, "font-weight: 400; ");
+          break;
+        case PANGO_WEIGHT_MEDIUM:
+          g_string_append (s, "font-weight: 500; ");
+          break;
+        case PANGO_WEIGHT_SEMIBOLD:
+          g_string_append (s, "font-weight: 600; ");
+          break;
+        case PANGO_WEIGHT_BOLD:
+          g_string_append (s, "font-weight: 700; ");
+          break;
+        case PANGO_WEIGHT_ULTRABOLD:
+          g_string_append (s, "font-weight: 800; ");
+          break;
+        case PANGO_WEIGHT_HEAVY:
+        case PANGO_WEIGHT_ULTRAHEAVY:
+          g_string_append (s, "font-weight: 900; ");
+          break;
+        }
+    }
+  if (set & PANGO_FONT_MASK_STRETCH)
+    {
+      switch (pango_font_description_get_stretch (desc))
+        {
+        case PANGO_STRETCH_ULTRA_CONDENSED:
+          g_string_append (s, "font-stretch: ultra-condensed; ");
+          break;
+        case PANGO_STRETCH_EXTRA_CONDENSED:
+          g_string_append (s, "font-stretch: extra-condensed; ");
+          break;
+        case PANGO_STRETCH_CONDENSED:
+          g_string_append (s, "font-stretch: condensed; ");
+          break;
+        case PANGO_STRETCH_SEMI_CONDENSED:
+          g_string_append (s, "font-stretch: semi-condensed; ");
+          break;
+        case PANGO_STRETCH_NORMAL:
+          g_string_append (s, "font-stretch: normal; ");
+          break;
+        case PANGO_STRETCH_SEMI_EXPANDED:
+          g_string_append (s, "font-stretch: semi-expanded; ");
+          break;
+        case PANGO_STRETCH_EXPANDED:
+          g_string_append (s, "font-stretch: expanded; ");
+          break;
+        case PANGO_STRETCH_EXTRA_EXPANDED:
+          g_string_append (s, "font-stretch: extra-expanded; ");
+          break;
+        case PANGO_STRETCH_ULTRA_EXPANDED:
+          g_string_append (s, "font-stretch: ultra-expanded; ");
+          break;
+        }
+    }
+  if (set & PANGO_FONT_MASK_SIZE)
+    {
+      g_string_append_printf (s, "font-size: %dpt", pango_font_description_get_size (desc) / PANGO_SCALE);
+    }
+
+  g_string_append (s, "}");
+
+  return g_string_free (s, FALSE);
+}
+
 static void
 gtk_font_button_label_use_font (GtkFontButton *font_button)
 {
@@ -1183,7 +1304,7 @@ gtk_font_button_label_use_font (GtkFontButton *font_button)
   else
     {
       PangoFontDescription *desc;
-      gchar *font, *data;
+      gchar *data;
 
       if (!priv->provider)
         {
@@ -1198,14 +1319,10 @@ gtk_font_button_label_use_font (GtkFontButton *font_button)
       if (!priv->use_size)
         pango_font_description_unset_fields (desc, PANGO_FONT_MASK_SIZE);
 
-      font = pango_font_description_to_string (desc);
-      data = g_strconcat ("* { font: ",  font, "; }", NULL);
-      
+      data = pango_font_description_to_css (desc);
       gtk_css_provider_load_from_data (priv->provider, data, -1, NULL);
 
       g_free (data);
-      g_free (font);
-
       pango_font_description_free (desc);
     }
 }