Commit CairoUtil class forgotten in commit 60ccdd.

src/gui/util/cairo-util.cpp

@@ -0,0 +1,81 @@
+/*
+  cairo-util.cpp - Defines utility functions for Cairo
+
+  Copyright (C)         Lumiera.org
+    2010,               Stefan Kangas <skangas@skangas.se>
+
+  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 2 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, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+* *****************************************************/
+
+#include "cairo-util.hpp"
+
+namespace gui {
+namespace util {
+
+    RefPtr<SolidPattern>
+    CairoUtil::pattern_set_red (const RefPtr<SolidPattern> color, double red)
+    {
+      double old_red;
+      double blue;
+      double green;
+      double alpha;
+
+      color->get_rgba (old_red, blue, green, alpha);
+
+      return Cairo::SolidPattern::create_rgba (red, blue, green, alpha);
+    }
+
+    RefPtr<SolidPattern>
+    CairoUtil::pattern_set_green (const RefPtr<SolidPattern> color, double blue)
+    {
+      double red;
+      double old_blue;
+      double green;
+      double alpha;
+
+      color->get_rgba (red, old_blue, green, alpha);
+
+      return Cairo::SolidPattern::create_rgba (red, blue, green, alpha);
+    }
+
+    RefPtr<SolidPattern>
+    CairoUtil::pattern_set_blue (const RefPtr<SolidPattern> color, double green)
+    {
+      double red;
+      double blue;
+      double old_green;
+      double alpha;
+
+      color->get_rgba (red, blue, old_green, alpha);
+
+      return Cairo::SolidPattern::create_rgba (red, blue, green, alpha);
+    }
+
+    RefPtr<SolidPattern>
+    CairoUtil::pattern_set_alpha (const RefPtr<SolidPattern> color, double alpha)
+    {
+      double red;
+      double blue;
+      double green;
+      double old_alpha;
+
+      color->get_rgba (red, blue, green, old_alpha);
+
+      return Cairo::SolidPattern::create_rgba (red, blue, green, alpha);
+    }
+
+}   // namespace util
+}   // namespace gui

src/gui/util/cairo-util.hpp

@@ -0,0 +1,73 @@
+/*
+  cairo-util.hpp - Declares utility functions for Cairo
+
+  Copyright (C)         Lumiera.org
+    2010,               Stefan Kangas <skangas@skangas.se>
+
+  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 2 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, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+* *****************************************************/
+
+#include <cairomm/cairomm.h>
+
+#ifndef UTIL_CAIRO_HPP
+#define UTIL_CAIRO_HPP
+
+using Cairo::RefPtr;
+using Cairo::SolidPattern;
+
+namespace gui {
+namespace util {
+
+  class CairoUtil
+  {
+  public:
+    /**
+     * Make a new SolidPattern from an old one, changing the red component of the color.
+     * @param The new value for the red component of the color.
+     * @return The new pattern.
+     */
+    static RefPtr<SolidPattern>
+    pattern_set_red (const RefPtr<SolidPattern> color, double red);
+
+    /**
+     * Make a new SolidPattern from an old one, changing the green component of the color.
+     * @param The new value for the green component of the color.
+     * @return The new pattern.
+     */
+    static RefPtr<SolidPattern>
+    pattern_set_green (const RefPtr<SolidPattern>, double green);
+
+    /**
+     * Make a new SolidPattern from an old one, changing the blue component of the color.
+     * @param The new value for the blue component of the color.
+     * @return The new pattern.
+     */
+    static RefPtr<SolidPattern>
+    pattern_set_blue (const RefPtr<SolidPattern>, double blue);
+
+    /**
+     * Make a new SolidPattern from an old one, changing the alpha component of the color.
+     * @param The new value for the alpha component of the color.
+     * @return The new pattern.
+     */
+    static RefPtr<SolidPattern>
+    pattern_set_alpha (const RefPtr<SolidPattern>, double alpha);
+  };
+
+}   // namespace util
+}   // namespace gui
+
+#endif