if no b/a area enabled some speed up when opening images

rtgui/procthread.h

@@ -0,0 +1,78 @@
+/*
+ *  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 _PROCTHREAD_
+#define _PROCTHREAD_
+
+#include <gtkmm.h>
+
+template <class T>
+class ProcessingThread {
+
+  protected:
+    bool tostop;
+    bool stopped;
+    std::list<T> jqueue;
+    Glib::Thread* thread;
+    bool fifo;
+
+  public:
+    ProcessingThread () : tostop(false), stopped(true), fifo(true) {}
+    void init () { tostop = false; stopped = true; }
+    void add (T de) { jqueue.push_back (de); }
+    void removejobs () { while (!jqueue.empty()) jqueue.pop_front (); }
+    void stop () { if (stopped) { tostop = true; return; } gdk_threads_leave(); tostop = true; Glib::Thread::self()->yield(); if (!stopped) thread->join (); gdk_threads_enter();}
+    
+    virtual void start () {}
+    virtual void process (T& e) {}
+    virtual void processCustomOrder () {}
+    virtual void end () {}
+
+    void process () { 
+        if (stopped)
+            #undef THREAD_PRIORITY_NORMAL
+            thread = Glib::Thread::create(sigc::mem_fun(*this, &ProcessingThread::process_), (unsigned long int)0, true, true, Glib::THREAD_PRIORITY_NORMAL);
+    }
+    void process_ () { 
+        stopped = false;
+        tostop = false;
+    
+        start ();     //   jqueue.sort ();
+
+
+        while (!tostop && !jqueue.empty ()) {
+            if (fifo) {
+                T current = jqueue.front ();
+                jqueue.pop_front ();
+                process (current);
+            }
+            else
+                processCustomOrder ();
+        }
+        stopped = true;
+        end ();
+    }
+    
+    bool runs () { return !stopped; }
+    
+    void terminate () { stop (); removejobs (); }
+    
+    int numOfJobs () { return jqueue.size(); }
+};
+
+#endif