[gnome-builder] pango: add PangoFontDescription->CSS conversion

[Christian Hergert <chergert src gnome org>]

commit ddb17ec1540dde409b4f1ddd59a8d36ce6d02c18
Author: Christian Hergert <christian hergert me>
Date:   Wed Dec 10 14:34:49 2014 -0800

    pango: add PangoFontDescription->CSS conversion

 src/util/gb-pango.c |  139 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/gb-pango.h |   30 +++++++++++
 2 files changed, 169 insertions(+), 0 deletions(-)
---
diff --git a/src/util/gb-pango.c b/src/util/gb-pango.c
new file mode 100644
index 0000000..f34967e
--- /dev/null
+++ b/src/util/gb-pango.c
@@ -0,0 +1,139 @@
+/* gb-pango.c
+ *
+ * Copyright (C) 2014 Christian Hergert <christian hergert me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib/gstdio.h>
+
+#include "gb-pango.h"
+
+static void
+_add_keyval (GString     *str,
+             const gchar *key,
+             const gchar *value)
+{
+  g_string_append_printf (str, "%s:%s;", key, value);
+}
+
+gchar *
+gb_pango_font_description_to_css (const PangoFontDescription *font_desc)
+{
+  PangoFontMask mask;
+  GString *str;
+
+  g_return_val_if_fail (font_desc, NULL);
+
+  str = g_string_new (NULL);
+
+  mask = pango_font_description_get_set_fields (font_desc);
+
+  if ((mask & PANGO_FONT_MASK_FAMILY) != 0)
+    {
+      const gchar *family;
+
+      family = pango_font_description_get_family (font_desc);
+      _add_keyval (str, "font-family", family);
+    }
+
+  if ((mask & PANGO_FONT_MASK_STYLE) != 0)
+    {
+      PangoVariant variant;
+
+      variant = pango_font_description_get_variant (font_desc);
+
+      switch (variant)
+        {
+        case PANGO_VARIANT_NORMAL:
+          _add_keyval (str, "font-variant", "normal");
+          break;
+
+        case PANGO_VARIANT_SMALL_CAPS:
+          _add_keyval (str, "font-variant", "small-caps");
+          break;
+
+        default:
+          break;
+        }
+    }
+
+  if ((mask & PANGO_FONT_MASK_WEIGHT))
+    {
+      gchar weight[12];
+
+      g_snprintf (weight, sizeof weight, "%d",
+                  (int)pango_font_description_get_weight (font_desc));
+      _add_keyval (str, "font-weight", weight);
+    }
+
+  if ((mask & PANGO_FONT_MASK_STRETCH))
+    {
+      const gchar *key = "font-stretch";
+
+      switch (pango_font_description_get_stretch (font_desc))
+        {
+        case PANGO_STRETCH_ULTRA_CONDENSED:
+          _add_keyval (str, key, "untra-condensed");
+          break;
+
+        case PANGO_STRETCH_EXTRA_CONDENSED:
+          _add_keyval (str, key, "extra-condensed");
+          break;
+
+        case PANGO_STRETCH_CONDENSED:
+          _add_keyval (str, key, "condensed");
+          break;
+
+        case PANGO_STRETCH_SEMI_CONDENSED:
+          _add_keyval (str, key, "semi-condensed");
+          break;
+
+        case PANGO_STRETCH_NORMAL:
+          _add_keyval (str, key, "normal");
+          break;
+
+        case PANGO_STRETCH_SEMI_EXPANDED:
+          _add_keyval (str, key, "semi-expanded");
+          break;
+
+        case PANGO_STRETCH_EXPANDED:
+          _add_keyval (str, key, "expanded");
+          break;
+
+        case PANGO_STRETCH_EXTRA_EXPANDED:
+          _add_keyval (str, key, "extra-expanded");
+          break;
+
+        case PANGO_STRETCH_ULTRA_EXPANDED:
+          _add_keyval (str, key, "untra-expanded");
+          break;
+
+        default:
+          break;
+        }
+    }
+
+  if ((mask & PANGO_FONT_MASK_SIZE))
+    {
+      gint font_size;
+      gchar value[12];
+
+      font_size = pango_font_description_get_size (font_desc) / PANGO_SCALE;
+      g_snprintf (value, sizeof value, "%dpx", font_size);
+      _add_keyval (str, "font-size", value);
+    }
+
+  return g_string_free (str, FALSE);
+}
diff --git a/src/util/gb-pango.h b/src/util/gb-pango.h
new file mode 100644
index 0000000..2194e51
--- /dev/null
+++ b/src/util/gb-pango.h
@@ -0,0 +1,30 @@
+/* gb-pango.h
+ *
+ * Copyright (C) 2014 Christian Hergert <christian hergert me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GB_PANGO_H
+#define GB_PANGO_H
+
+#include <pango/pango.h>
+
+G_BEGIN_DECLS
+
+gchar *gb_pango_font_description_to_css (const PangoFontDescription *font_desc);
+
+G_END_DECLS
+
+#endif /* GB_PANGO_H */