232 lines
7.6 KiB
C++
232 lines
7.6 KiB
C++
/* 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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#include "ImageReaderWriter.h"
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#include <osg/Texture2D>
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#include <osg/Geometry>
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#include <osg/Geode>
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#include <sstream>
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ImageReaderWriter::DataReference::DataReference():
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_fileName(),
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_resolutionX(256),
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_resolutionY(256),
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_center(0.625f,0.0f,0.0f),
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_maximumWidth(1.25f,0.0f,0.0f),
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_maximumHeight(0.0f,0.0f,1.0f),
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_numPointsAcross(10),
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_numPointsUp(10),
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_backPage(false) {}
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ImageReaderWriter::DataReference::DataReference(const std::string& fileName, unsigned int res, float width, float height,bool backPage):
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_fileName(fileName),
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_resolutionX(res),
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_resolutionY(res),
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_center(width*0.5f,0.0f,height*0.5f),
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_maximumWidth(width,0.0f,0.0f),
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_maximumHeight(0.0f,0.0f,height),
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_numPointsAcross(10),
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_numPointsUp(10),
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_backPage(backPage) {}
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ImageReaderWriter::DataReference::DataReference(const DataReference& rhs):
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_fileName(rhs._fileName),
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_resolutionX(rhs._resolutionX),
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_resolutionY(rhs._resolutionY),
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_center(rhs._center),
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_maximumWidth(rhs._maximumWidth),
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_maximumHeight(rhs._maximumHeight),
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_numPointsAcross(rhs._numPointsAcross),
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_numPointsUp(rhs._numPointsUp),
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_backPage(rhs._backPage) {}
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ImageReaderWriter::ImageReaderWriter()
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{
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}
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std::string ImageReaderWriter::local_insertReference(const std::string& fileName, unsigned int res, float width, float height, bool backPage)
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{
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std::stringstream ostr;
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ostr<<"res_"<<res<<"_"<<fileName;
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std::string myReference = ostr.str();
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_dataReferences[myReference] = DataReference(fileName,res,width,height,backPage);
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return myReference;
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}
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osg::Image* ImageReaderWriter::readImage_Archive(DataReference& dr, float& s,float& t)
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{
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for(PhotoArchiveList::iterator itr=_photoArchiveList.begin();
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itr!=_photoArchiveList.end();
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++itr)
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{
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osg::Image* image = (*itr)->readImage(dr._fileName,dr._resolutionX,dr._resolutionY,s,t);
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if (image) return image;
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}
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return 0;
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}
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osg::Image* ImageReaderWriter::readImage_DynamicSampling(DataReference& dr, float& s,float& t)
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{
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// record previous options.
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osg::ref_ptr<osgDB::ReaderWriter::Options> previousOptions = osgDB::Registry::instance()->getOptions();
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osg::ref_ptr<osgDB::ImageOptions> options = new osgDB::ImageOptions;
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options->_destinationImageWindowMode = osgDB::ImageOptions::PIXEL_WINDOW;
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options->_destinationPixelWindow.set(0,0,dr._resolutionX,dr._resolutionY);
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osgDB::Registry::instance()->setOptions(options.get());
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osg::Image* image = osgDB::readImageFile(dr._fileName);
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// restore previous options.
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osgDB::Registry::instance()->setOptions(previousOptions.get());
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s = options.valid()?options->_sourcePixelWindow.windowWidth:1.0f;
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t = options.valid()?options->_sourcePixelWindow.windowHeight:1.0f;
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return image;
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}
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osgDB::ReaderWriter::ReadResult ImageReaderWriter::local_readNode(const std::string& fileName, const Options*)
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{
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DataReferenceMap::iterator itr = _dataReferences.find(fileName);
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if (itr==_dataReferences.end()) return osgDB::ReaderWriter::ReadResult::FILE_NOT_HANDLED;
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DataReference& dr = itr->second;
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osg::Image* image = 0;
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float s=1.0f,t=1.0f;
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// try to load photo from any loaded PhotoArchives
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if (!_photoArchiveList.empty())
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image = readImage_Archive(dr,s,t);
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// not loaded yet, so try to load it directly.
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if (!image)
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image = readImage_DynamicSampling(dr,s,t);
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if (image)
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{
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float photoWidth = 0.0f;
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float photoHeight = 0.0f;
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float maxWidth = dr._maximumWidth.length();
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float maxHeight = dr._maximumHeight.length();
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if ((s/t)>(maxWidth/maxHeight))
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{
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// photo wider than tall relative to the required pictures size.
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// so need to clamp the width to the maximum width and then
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// set the height to keep the original photo aspect ratio.
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photoWidth = maxWidth;
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photoHeight = photoWidth*(t/s);
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}
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else
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{
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// photo tall than wide relative to the required pictures size.
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// so need to clamp the height to the maximum height and then
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// set the width to keep the original photo aspect ratio.
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photoHeight = maxHeight;
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photoWidth = photoHeight*(s/t);
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}
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photoWidth*=0.95;
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photoHeight*=0.95;
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osg::Vec3 halfWidthVector(dr._maximumWidth*(photoWidth*0.5f/maxWidth));
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osg::Vec3 halfHeightVector(dr._maximumHeight*(photoHeight*0.5f/maxHeight));
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// set up the texture.
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osg::Texture2D* texture = new osg::Texture2D;
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texture->setImage(image);
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texture->setResizeNonPowerOfTwoHint(false);
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texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
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texture->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
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// set up the drawstate.
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osg::StateSet* dstate = new osg::StateSet;
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dstate->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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dstate->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
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// set up the geoset.
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osg::Geometry* geom = new osg::Geometry;
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geom->setStateSet(dstate);
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osg::Vec3Array* coords = new osg::Vec3Array(4);
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if (!dr._backPage)
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{
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(*coords)[0] = dr._center - halfWidthVector + halfHeightVector;
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(*coords)[1] = dr._center - halfWidthVector - halfHeightVector;
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(*coords)[2] = dr._center + halfWidthVector - halfHeightVector;
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(*coords)[3] = dr._center + halfWidthVector + halfHeightVector;
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}
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else
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{
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(*coords)[3] = dr._center - halfWidthVector + halfHeightVector;
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(*coords)[2] = dr._center - halfWidthVector - halfHeightVector;
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(*coords)[1] = dr._center + halfWidthVector - halfHeightVector;
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(*coords)[0] = dr._center + halfWidthVector + halfHeightVector;
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}
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geom->setVertexArray(coords);
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osg::Vec2Array* tcoords = new osg::Vec2Array(4);
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(*tcoords)[0].set(0.0f,1.0f);
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(*tcoords)[1].set(0.0f,0.0f);
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(*tcoords)[2].set(1.0f,0.0f);
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(*tcoords)[3].set(1.0f,1.0f);
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geom->setTexCoordArray(0,tcoords);
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osg::Vec4Array* colours = new osg::Vec4Array(1);
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(*colours)[0].set(1.0f,1.0f,1.0,1.0f);
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geom->setColorArray(colours);
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geom->setColorBinding(osg::Geometry::BIND_OVERALL);
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geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
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// set up the geode.
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(geom);
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return geode;
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}
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else
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{
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return osgDB::ReaderWriter::ReadResult::FILE_NOT_HANDLED;
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}
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}
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