Added support for pruning old images, recording the Duration in the .osg file, and -o filename output support in osgimagesequence.

src/osg/ImageSequence.cpp

@@ -42,6 +42,7 @@ ImageSequence::ImageSequence()
     _timeMultiplier = 1.0;
 
     _duration = 1.0;
+    _timePerImage = 1.0;
     _pruneOldImages = false;
 
     _imageIteratorTime = DBL_MAX;
@@ -64,16 +65,31 @@ int ImageSequence::compare(const Image& rhs) const
     return ImageStream::compare(rhs);
 }
 
+void ImageSequence::setDuration(double duration)
+{
+    _duration = duration;
+    computeTimePerImage();
+}
+
+void ImageSequence::computeTimePerImage()
+{
+    if (!_fileNames.empty()) _timePerImage = _duration / double(_fileNames.size());
+    else if (!_images.empty()) _timePerImage = _duration / double(_images.size());
+    else _timePerImage = _duration;
+}
+
 void ImageSequence::addImageFile(const std::string& fileName)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
     _fileNames.push_back(fileName);
+    computeTimePerImage();
 }
 
 void ImageSequence::addImage(osg::Image* image)
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
     _images.push_back(image);
+    computeTimePerImage();
 
     if (_imageIterator==_images.end())
     {
@@ -115,9 +131,6 @@ void ImageSequence::update(osg::NodeVisitor* nv)
     }
     
     double time = (fs->getSimulationTime() - _referenceTime)*_timeMultiplier;
-    double delta = _fileNames.empty() ?
-            _duration / _images.size() : 
-            _duration / _fileNames.size();
             
     Images::iterator previous_imageIterator = _imageIterator;
     
@@ -126,14 +139,20 @@ void ImageSequence::update(osg::NodeVisitor* nv)
     if (_imageIterator!=_images.end())
     {
         // osg::notify(osg::NOTICE)<<"   _imageIteratorTime = "<<_imageIteratorTime<<std::endl;
-        while(time > (_imageIteratorTime + delta))
+        while(time > (_imageIteratorTime + _timePerImage))
         {
-            _imageIteratorTime += delta;
+            _imageIteratorTime += _timePerImage;
             // osg::notify(osg::NOTICE)<<"   _imageIteratorTime = "<<_imageIteratorTime<<std::endl;
             ++_imageIterator;
             
             if (_imageIterator ==_images.end())
             {
+
+                if (_pruneOldImages)
+                {
+                    _images.erase(previous_imageIterator, _imageIterator);
+                }
+
                 // return iterator to begining of set.            
                 _imageIterator = _images.begin();
             }
@@ -147,6 +166,11 @@ void ImageSequence::update(osg::NodeVisitor* nv)
     
     if (_imageIterator!=_images.end() && previous_imageIterator != _imageIterator)
     {
+        if (_pruneOldImages)
+        {
+            _images.erase(previous_imageIterator, _imageIterator);
+        }
+    
         setImageToChild(_imageIterator->get());
     }
 }

src/osgPlugins/osg/ImageSequence.cpp

@@ -27,6 +27,14 @@ bool ImageSequence_readLocalData(Object& obj, Input& fr)
 
     ImageSequence& is = static_cast<ImageSequence&>(obj);
 
+    unsigned int numFilesToPreLoad = 1;
+
+    double duration;
+    if (fr.read("Duration", duration))
+    {
+        is.setDuration(duration);
+    }
+    
     if (fr.matchSequence("FileNames {"))
     {
         fr += 2;
@@ -36,12 +44,13 @@ bool ImageSequence_readLocalData(Object& obj, Input& fr)
         {
             if (fr[0].getStr())
             {
-#if 1
                 is.addImageFile(fr[0].getStr());
-#else                           
-                osg::ref_ptr<osg::Image> image = fr.readImage(fr[0].getStr());
-                if (image.valid()) is.addImage(image.get());
-#endif
+
+                if (is.getImages().size() < numFilesToPreLoad)
+                {
+                    osg::ref_ptr<osg::Image> image = fr.readImage(fr[0].getStr());
+                    if (image.valid()) is.addImage(image.get());
+                }
             }
             ++fr;
         }
@@ -74,6 +83,8 @@ bool ImageSequence_writeLocalData(const Object& obj, Output& fw)
     // no current image writing code here 
     // as it is all handled by osg::Registry::writeImage() via plugins.
     
+    fw.indent()<<"Duration "<<is.getDuration()<<std::endl;
+    
     if (!is.getFileNames().empty())
     {
         fw.indent()<<"FileNames {"<<std::endl;