[pangomm] Attributes: Add create_attr_foreground/background_alpha().

[Murray Cumming <murrayc src gnome org>]

commit 5d62abbf87e140ee67636f73d4114162fc83154b
Author: Murray Cumming <murrayc murrayc com>
Date:   Sun Nov 29 20:49:44 2015 +0100

    Attributes: Add create_attr_foreground/background_alpha().
    
    Wrapping new API in pango.

 pango/src/attributes.ccg |   10 ++++++++++
 pango/src/attributes.hg  |   10 ++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/pango/src/attributes.ccg b/pango/src/attributes.ccg
index 378ffed..f7ecc64 100644
--- a/pango/src/attributes.ccg
+++ b/pango/src/attributes.ccg
@@ -94,6 +94,16 @@ AttrColor Attribute::create_attr_background(guint16 red, guint16 green, guint16
   return Glib::wrap((PangoAttrColor*)pango_attr_background_new(red, green, blue));
 }
 
+AttrInt Attribute::create_attr_foreground_alpha(guint16 alpha)
+{
+  return Glib::wrap((PangoAttrInt*)pango_attr_foreground_alpha_new(alpha));
+}
+
+AttrInt Attribute::create_attr_background_alpha(guint16 alpha)
+{
+  return Glib::wrap((PangoAttrInt*)pango_attr_background_alpha_new(alpha));
+}
+
 AttrInt Attribute::create_attr_size(int size)
 {
   return Glib::wrap((PangoAttrInt*)pango_attr_size_new(size));
diff --git a/pango/src/attributes.hg b/pango/src/attributes.hg
index d07d71d..14f8a9b 100644
--- a/pango/src/attributes.hg
+++ b/pango/src/attributes.hg
@@ -146,6 +146,16 @@ public:
    */
   static AttrColor create_attr_background(guint16 red, guint16 green, guint16 blue);
 
+  /** Create a new foreground alpha attribute.
+   * @param alpha The alpha value, between 1 and 65536.
+   */
+  static AttrInt create_attr_foreground_alpha(guint16 alpha);
+
+  /** Create a new background alpha attribute.
+   * @param alpha The alpha value, between 1 and 65536.
+   */
+  static AttrInt create_attr_background_alpha(guint16 alpha);
+
   /** Create a new font-size attribute.
    * @param size The font size, in 1000ths of a point.
    * @return An attribute of type AttrInt.