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

rtgui/thumbimageupdater.h

@@ -0,0 +1,66 @@
+/*
+ *  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 _THUMBIMAGEUPDATER_
+#define _THUMBIMAGEUPDATER_
+
+#include <glibmm.h>
+#include <rtengine.h>
+#include <thumbnail.h>
+
+class ThumbImageUpdateListener {
+
+    public:
+        virtual void updateImage (rtengine::IImage8* img, double scale, rtengine::procparams::CropParams cropParams) {}
+};
+
+class ThumbImageUpdater {
+
+    struct Job {
+        Thumbnail* thumbnail;
+        rtengine::procparams::ProcParams pparams;
+        int height;
+        bool* priority;
+        ThumbImageUpdateListener* listener;
+    };
+
+  protected:
+    bool tostop;
+    bool stopped;
+    std::list<Job> jqueue;
+    Glib::Thread* thread;
+    Glib::Mutex* qMutex;
+    Glib::Mutex* startMutex;
+
+  public:
+    ThumbImageUpdater ();
+
+    void add        (Thumbnail* t, const rtengine::procparams::ProcParams& params, int height, bool* priority, ThumbImageUpdateListener* l);
+    void process    ();
+    void stop       ();
+    void removeJobs ();
+    void removeJobs (ThumbImageUpdateListener* listener);
+    void terminate  ();
+
+    void process_   ();
+    void processJob (Job current);
+};
+
+extern ThumbImageUpdater thumbImageUpdater;
+
+#endif