Pipette and "On Preview Widgets" branch. See issue 227

The pipette part is already working quite nice but need to be finished. The widgets part needs more work...

rtengine/shmap.h

@@ -0,0 +1,44 @@
+/*
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
+ *
+ *  RawTherapee 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.
+ * 
+ *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __SHMAP__
+#define __SHMAP__
+
+#include "imagefloat.h"
+#include "image16.h"
+
+namespace rtengine {
+
+class SHMap {
+
+    public: 
+        int W, H;
+        float** map;
+        float   max_f, min_f, avg;
+        bool multiThread;
+        
+     SHMap (int w, int h, bool multiThread);
+    ~SHMap ();
+
+    void update (Imagefloat* img, double radius, double lumi[3], bool hq, int skip);
+    void forceStat (float max_, float min_, float avg_);
+	void dirpyr_shmap       (float ** data_fine, float ** data_coarse, 
+							 int width, int height, LUTf & rangefn, int level, int scale);
+};
+}
+#endif