Add GdkRGBA struct to supersede GdkColor

GdkRGBA is a boxed struct similar to GdkColor, with the difference
that it stores alpha information as well, and colors are stored in
[0..1] doubles, in the cairo spirit.

gdk_cairo_set_source_rgba() has been also added to allow easier handling
of this new type.

1 files changed, 65 insertions, 0 deletions

diff --git a/gdk/gdkrgba.h b/gdk/gdkrgba.h
new file mode 100644
index 0000000000..7b50630c61
--- /dev/null
+++ b/gdk/gdkrgba.h
@@ -0,0 +1,65 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/*
+ * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
+ * file for a list of people on the GTK+ Team.  See the ChangeLog
+ * files for a list of changes.  These files are distributed with
+ * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
+#error "Only <gdk/gdk.h> can be included directly."
+#endif
+
+#ifndef __GDK_RGBA_H__
+#define __GDK_RGBA_H__
+
+#include <gdk/gdktypes.h>
+
+G_BEGIN_DECLS
+
+struct _GdkRGBA
+{
+  gdouble red;
+  gdouble green;
+  gdouble blue;
+  gdouble alpha;
+};
+
+#define GDK_TYPE_RGBA (gdk_rgba_get_type ())
+
+GdkRGBA * gdk_rgba_copy (GdkRGBA *rgba);
+void      gdk_rgba_free (GdkRGBA *rgba);
+
+gboolean  gdk_rgba_parse (const gchar *spec,
+                          GdkRGBA     *rgba);
+
+guint     gdk_rgba_hash  (gconstpointer p);
+gboolean  gdk_rgba_equal (gconstpointer p1,
+                          gconstpointer p2);
+
+gchar *   gdk_rgba_to_string (GdkRGBA *rgba);
+
+GType     gdk_rgba_get_type (void) G_GNUC_CONST;
+
+
+G_END_DECLS
+
+#endif /* __GDK_RGBA_H__ */