Introduced new osgpdf example that use Cario + Poppler libraries to provide a means of rendering a pdf document to an osg::Image.
This commit is contained in:
Robert Osfield
parent
453e595636
commit
771dc7d645
@ -108,6 +108,12 @@ IF(DYNAMIC_OPENSCENEGRAPH)
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ADD_SUBDIRECTORY(osgvolume)
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ADD_SUBDIRECTORY(osgwindows)
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IF (POPPLER_FOUND AND CAIRO_FOUND)
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ADD_SUBDIRECTORY(osgpdf)
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ENDIF(POPPLER_FOUND AND CAIRO_FOUND)
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IF (BUILD_OSG_WRAPPERS)
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ADD_SUBDIRECTORY(osgintrospection)
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ENDIF(BUILD_OSG_WRAPPERS)
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13
examples/osgpdf/CMakeLists.txt
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13
examples/osgpdf/CMakeLists.txt
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@ -0,0 +1,13 @@
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PKG_CHECK_MODULES(POPPLER poppler-glib)
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SET(TARGET_SRC osgpdf.cpp)
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INCLUDE_DIRECTORIES( ${CAIRO_INCLUDE_DIRS} ${POPPLER_INCLUDE_DIRS} )
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LINK_DIRECTORIES(${CAIRO_LIBRARY_DIRS} ${POPPLER_LIB_DIRS})
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#SET(TARGET_EXTERNAL_LIBRARIES ${CAIRO_LIBRARIES} poppler poppler-glib)
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SET(TARGET_EXTERNAL_LIBRARIES ${CAIRO_LIBRARIES} ${POPPLER_LIBRARIES})
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#### end var setup ###
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SETUP_EXAMPLE(osgpdf)
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306
examples/osgpdf/osgpdf.cpp
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306
examples/osgpdf/osgpdf.cpp
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@ -0,0 +1,306 @@
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#include <osg/Image>
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#include <osg/Geometry>
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#include <osg/Texture2D>
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#include <osg/io_utils>
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#include <osgViewer/Viewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <osgDB/ReadFile>
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#include <cairo.h>
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#include <poppler.h>
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class CarioImage : public osg::Image
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{
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public:
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CarioImage():
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_surface(0),
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_context(0) {}
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void create(unsigned int width, unsigned int height)
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{
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if (data() && width==s() && height==t()) return;
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osg::notify(osg::NOTICE)<<"Create cario surface/context "<<width<<", "<<height<<std::endl;
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// allocate the image data
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allocateImage(width, height, 1, GL_RGBA, GL_UNSIGNED_BYTE);
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setPixelFormat(GL_BGRA);
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setDataVariance(osg::Object::DYNAMIC);
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setOrigin(osg::Image::TOP_LEFT);
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// create a cairo surface for this image data
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_surface = cairo_image_surface_create_for_data(
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data(),
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CAIRO_FORMAT_ARGB32,
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width, height,
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getRowSizeInBytes());
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// create a context for the surface
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_context = cairo_create(_surface);
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}
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void destroy()
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{
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if (_surface) cairo_surface_destroy(_surface);
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if (_context) cairo_destroy(_context);
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}
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cairo_surface_t* getSurface() { return _surface; }
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const cairo_surface_t* getSurface() const { return _surface; }
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cairo_t* getContext() { return _context; }
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const cairo_t* getContext() const { return _context; }
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protected:
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virtual ~CarioImage()
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{
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destroy();
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}
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cairo_surface_t* _surface;
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cairo_t* _context;
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};
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class PdfImage : public CarioImage
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{
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public:
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PdfImage():
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_doc(0),
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_pageNum(0)
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{
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}
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virtual ~PdfImage()
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{
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if (_doc)
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{
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g_object_unref(_doc);
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}
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}
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PopplerDocument* _doc;
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int _pageNum;
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int getNumOfPages() { return _doc ? poppler_document_get_n_pages(_doc) : 0; }
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bool open(const std::string& filename)
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{
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osg::notify(osg::NOTICE)<<"open("<<filename<<")"<<std::endl;
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static bool gTypeInit = false;
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if(!gTypeInit)
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{
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g_type_init();
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gTypeInit = true;
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}
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PopplerDocument* doc = poppler_document_new_from_file(filename.c_str(), NULL, NULL);
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if (!doc)
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{
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osg::notify(osg::NOTICE)<<" could not open("<<filename<<")"<<std::endl;
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return false;
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}
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if (_doc)
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{
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g_object_unref(_doc);
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}
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_doc = doc;
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_pageNum = 0;
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setFileName(filename);
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osg::notify(osg::NOTICE)<<"getNumOfPages()=="<<getNumOfPages()<<std::endl;
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if (getNumOfPages()==0)
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{
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return false;
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}
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page(0);
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return true;
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}
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virtual void sendKeyEvent(int key, bool keyDown)
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{
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if (keyDown)
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{
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if (key=='n') next();
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else if (key=='p') previous();
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}
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}
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bool previous()
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{
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return page(_pageNum-1);
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}
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bool next()
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{
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return page(_pageNum+1);
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}
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bool page(int pageNum)
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{
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if (!_doc) return false;
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if (pageNum<0 || pageNum>=getNumOfPages()) return false;
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PopplerPage* page = poppler_document_get_page(_doc, pageNum);
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if(!page) return false;
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_pageNum = pageNum;
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double w = 0.0f;
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double h = 0.0f;
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poppler_page_get_size(page, &w, &h);
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create((unsigned int)(w),(unsigned int)(h));
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double r = 1.0;
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double g = 1.0;
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double b = 1.0;
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double a = 1.0;
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cairo_save(_context);
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cairo_set_source_rgba(_context, r, g, b, a);
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cairo_rectangle(_context, 0.0, 0.0, w, h);
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cairo_fill(_context);
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poppler_page_render(page, getContext());
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cairo_restore(_context);
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dirty();
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}
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};
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osg::Node* createInteractiveQuad(const osg::Vec3& origin, osg::Vec3& widthAxis, osg::Vec3& heightAxis,
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osg::Image* image)
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{
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bool flip = image->getOrigin()==osg::Image::TOP_LEFT;
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osg::Geometry* pictureQuad = osg::createTexturedQuadGeometry(origin, widthAxis, heightAxis,
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0.0f, flip ? 1.0f : 0.0f , 1.0f, flip ? 0.0f : 1.0f);
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osg::Texture2D* texture = new osg::Texture2D(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->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
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texture->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
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pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
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texture,
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osg::StateAttribute::ON);
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pictureQuad->setEventCallback(new osgViewer::InteractiveImageHandler(image));
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(pictureQuad);
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return geode;
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}
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class PageHandler : public osgGA::GUIEventHandler
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{
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public:
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PageHandler() {}
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bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
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{
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if (ea.getHandled()) return false;
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switch(ea.getEventType())
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{
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case(osgGA::GUIEventAdapter::KEYDOWN):
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{
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if (ea.getKey()=='n')
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{
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osg::notify(osg::NOTICE)<<"Next page"<<std::endl;
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return true;
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}
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else
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if (ea.getKey()=='p')
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{
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osg::notify(osg::NOTICE)<<"Previous page"<<std::endl;
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return true;
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}
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}
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default:
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return false;
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}
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return false;
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}
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};
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int main(int argc,char** argv)
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{
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osg::ArgumentParser arguments(&argc, argv);
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osgViewer::Viewer viewer(arguments);
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typedef std::list< osg::ref_ptr<osg::Image> > Images;
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Images images;
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for(int i=1; i<arguments.argc(); ++i)
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{
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if (!arguments.isOption(i))
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{
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osg::ref_ptr<PdfImage> pdfImage= new PdfImage;
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if (pdfImage->open(arguments[i]))
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{
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images.push_back(pdfImage.get());
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}
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}
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}
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bool xyPlane = false;
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osg::Group* group = new osg::Group;
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osg::Vec3 origin = osg::Vec3(0.0f,0.0f,0.0f);
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for(Images::iterator itr = images.begin();
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itr != images.end();
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++itr)
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{
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osg::Image* image = itr->get();
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float width = 1.0;
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float height = float(image->t())/float(image->s());
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osg::Vec3 widthAxis = osg::Vec3(width,0.0f,0.0f);
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osg::Vec3 heightAxis = xyPlane ? osg::Vec3(0.0f,height,0.0f) : osg::Vec3(0.0f,0.0f,height);
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group->addChild(createInteractiveQuad(origin, widthAxis, heightAxis, image));
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origin += widthAxis*1.1f;
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}
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viewer.setSceneData(group);
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viewer.addEventHandler(new osgViewer::StatsHandler);
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//viewer.addEventHandler(new PageHandler);
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return viewer.run();
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}
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