6a67be2e32
forcing users to use osgDB::readRef*File() methods. The later is preferable as it closes a potential threading bug when using paging databases in conjunction
with the osgDB::Registry Object Cache. This threading bug occurs when one thread gets an object from the Cache via an osgDB::read*File() call where only
a pointer to the object is passed back, so taking a reference to the object is delayed till it gets reassigned to a ref_ptr<>, but at the same time another
thread calls a flush of the Object Cache deleting this object as it's referenceCount is now zero. Using osgDB::readREf*File() makes sure the a ref_ptr<> is
passed back and the referenceCount never goes to zero.
To ensure the OSG builds when OSG_PROVIDE_READFILE is to OFF the many cases of osgDB::read*File() usage had to be replaced with a ref_ptr<> osgDB::readRef*File()
usage. The avoid this change causing lots of other client code to be rewritten to handle the use of ref_ptr<> in place of C pointer I introduced a serious of
templte methods in various class to adapt ref_ptr<> to the underly C pointer to be passed to old OSG API's, example of this is found in include/osg/Group:
bool addChild(Node* child); // old method which can only be used with a Node*
tempalte<class T> bool addChild(const osg::ref_ptr<T>& child) { return addChild(child.get()); } // adapter template method
These changes together cover 149 modified files, so it's a large submission. This extent of changes are warrent to make use of the Object Cache
and multi-threaded loaded more robust.
git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.4@15165 16af8721-9629-0410-8352-f15c8da7e697
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/* -*-c++-*-
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*
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* OpenSceneGraph example, osgphotoalbum.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef IMAGEREADERWRITER_H
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#define IMAGEREADERWRITER_H
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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#include <osgDB/ImageOptions>
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#include <OpenThreads/ScopedLock>
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#include <OpenThreads/ReentrantMutex>
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#include "PhotoArchive.h"
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#define SERIALIZER() OpenThreads::ScopedLock<OpenThreads::ReentrantMutex> lock(_serializerMutex)
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class ImageReaderWriter : public osgDB::ReaderWriter
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{
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public:
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ImageReaderWriter();
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virtual const char* className() const { return "ImageReader"; }
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void addPhotoArchive(PhotoArchive* archive) { _photoArchiveList.push_back(archive); }
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std::string insertReference(const std::string& fileName, unsigned int res, float width, float height, bool backPage)
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{
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SERIALIZER();
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return const_cast<ImageReaderWriter*>(this)->local_insertReference(fileName, res, width, height, backPage);
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}
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virtual ReadResult readNode(const std::string& fileName, const Options* options) const
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{
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SERIALIZER();
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return const_cast<ImageReaderWriter*>(this)->local_readNode(fileName, options);
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}
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protected:
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std::string local_insertReference(const std::string& fileName, unsigned int res, float width, float height, bool backPage);
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ReadResult local_readNode(const std::string& fileName, const Options*);
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mutable OpenThreads::ReentrantMutex _serializerMutex;
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struct DataReference
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{
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DataReference();
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DataReference(const std::string& fileName, unsigned int res, float width, float height,bool backPage);
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DataReference(const DataReference& rhs);
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std::string _fileName;
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unsigned int _resolutionX;
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unsigned int _resolutionY;
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osg::Vec3 _center;
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osg::Vec3 _maximumWidth;
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osg::Vec3 _maximumHeight;
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unsigned int _numPointsAcross;
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unsigned int _numPointsUp;
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bool _backPage;
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};
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osg::ref_ptr<osg::Image> readImage_Archive(DataReference& dr, float& s,float& t);
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osg::ref_ptr<osg::Image> readImage_DynamicSampling(DataReference& dr, float& s,float& t);
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typedef std::map< std::string,DataReference > DataReferenceMap;
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typedef std::vector< osg::ref_ptr<PhotoArchive> > PhotoArchiveList;
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DataReferenceMap _dataReferences;
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PhotoArchiveList _photoArchiveList;
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};
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#endif
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