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/StopWatch.h

@@ -0,0 +1,56 @@
+/*
+ *  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/>.
+ *
+ *  Author: reine
+ */
+
+#ifndef STOPWATCH_H
+#define	STOPWATCH_H
+#include <iostream>
+#include <sys/time.h>
+
+class StopWatch {
+public:
+    StopWatch( ) { stopped = false; }
+    StopWatch( const char* msg) { message = msg; start(); stopped = false; }
+    ~StopWatch() { if(!stopped) stop(); }
+    void start()
+    {
+        gettimeofday(&startStruct,NULL);
+    };
+    void stop()
+    {
+        gettimeofday(&stopStruct,NULL);
+        long elapsedTime = (stopStruct.tv_sec - startStruct.tv_sec) * 1000.0;      // sec to ms
+        elapsedTime += (stopStruct.tv_usec - startStruct.tv_usec)/1000;
+        std::cout << message << " took " << elapsedTime << "ms" <<std::endl;
+        stopped = true;
+    }
+    void stop(const char *msg)
+    {
+    	message = msg;
+    	stop();
+    };
+private:
+    struct timeval startStruct;
+    struct timeval stopStruct;
+    const char *message;
+    bool stopped;
+};
+
+#endif	/* STOPWATCH_H */