Could not load image with extension .png #2819

heloiseouvry · 2022-03-30T14:13:56Z

heloiseouvry
Mar 30, 2022

Hello everyone,

The GUI is closing suddenly when I'm trying to show the point indices on my geometry. It happened in other situations which I could not remember right now but I'd add them up here if I encounter again.

It raises the following error:

[ERROR]   [Image] Could not load image with extension png. Valid extensions: ["bmp", "dds"]

########## SIG 11 - SIGSEGV: segfault ##########
  sofa::helper::BackTrace::sig(int)
  sofa::gl::Texture::init()
  sofa::gl::GlText::textureDraw_Indices(sofa::type::vector<sofa::type::Vec<3u, double>, sofa::type::CPUMemoryManager<sofa::type::Vec<3u, double> > > const&, float const&)
  sofa::gl::DrawToolGL::draw3DText_Indices(std::vector<sofa::type::Vec<3u, double>, std::allocator<sofa::type::Vec<3u, double> > > const&, float, sofa::type::RGBAColor const&)
  sofa::component::topology::PointSetGeometryAlgorithms<sofa::defaulttype::StdVectorTypes<sofa::type::Vec<3u, double>, sofa::type::Vec<3u, double>, double> >::draw(sofa::core::visual::VisualParams const*)
  sofa::component::topology::EdgeSetGeometryAlgorithms<sofa::defaulttype::StdVectorTypes<sofa::type::Vec<3u, double>, sofa::type::Vec<3u, double>, double> >::draw(sofa::core::visual::VisualParams const*)
  sofa::component::topology::QuadSetGeometryAlgorithms<sofa::defaulttype::StdVectorTypes<sofa::type::Vec<3u, double>, sofa::type::Vec<3u, double>, double> >::draw(sofa::core::visual::VisualParams const*)
  sofa::component::topology::HexahedronSetGeometryAlgorithms<sofa::defaulttype::StdVectorTypes<sofa::type::Vec<3u, double>, sofa::type::Vec<3u, double>, double> >::draw(sofa::core::visual::VisualParams const*)
  sofa::simulation::VisualVisitor::processNodeTopDown(sofa::simulation::Node*)
  sofa::simulation::VisualDrawVisitor::processNodeTopDown(sofa::simulation::Node*)
  sofa::simulation::graph::DAGNode::executeVisitorTreeTraversal(sofa::simulation::Visitor*, std::map<sofa::simulation::graph::DAGNode*, sofa::simulation::graph::DAGNode::StatusStruct, std::less<sofa::simulation::graph::DAGNode*>, std::allocator<std::pair<sofa::simulation::graph::DAGNode* const, sofa::simulation::graph::DAGNode::StatusStruct> > >&, sofa::simulation::Visitor::TreeTraversalRepetition, bool)
  sofa::simulation::graph::DAGNode::executeVisitorTreeTraversal(sofa::simulation::Visitor*, std::map<sofa::simulation::graph::DAGNode*, sofa::simulation::graph::DAGNode::StatusStruct, std::less<sofa::simulation::graph::DAGNode*>, std::allocator<std::pair<sofa::simulation::graph::DAGNode* const, sofa::simulation::graph::DAGNode::StatusStruct> > >&, sofa::simulation::Visitor::TreeTraversalRepetition, bool)
  sofa::simulation::graph::DAGNode::doExecuteVisitor(sofa::simulation::Visitor*, bool)
  sofa::simulation::DefaultVisualManagerLoop::drawStep(sofa::core::visual::VisualParams*)
  sofa::simulation::Simulation::draw(sofa::core::visual::VisualParams*, sofa::simulation::Node*)
  sofa::gui::qt::viewer::qgl::QtGLViewer::DisplayOBJs()
  sofa::gui::qt::viewer::qgl::QtGLViewer::drawScene()
  sofa::gui::qt::viewer::qgl::QtGLViewer::draw()
  QGLViewer::paintGL()
  QWidget::event(QEvent*)
  QApplicationPrivate::notify_helper(QObject*, QEvent*)
  QApplication::notify(QObject*, QEvent*)
  QCoreApplication::notifyInternal2(QObject*, QEvent*)
  QWidgetPrivate::sendPaintEvent(QRegion const&)
  QWidgetPrivate::syncBackingStore()
  QWidget::event(QEvent*)
  QMainWindow::event(QEvent*)
  QApplicationPrivate::notify_helper(QObject*, QEvent*)
  QApplication::notify(QObject*, QEvent*)
  QCoreApplication::notifyInternal2(QObject*, QEvent*)
  QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*)
  g_main_context_dispatch
  g_main_context_iteration
  QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
  QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
  QCoreApplication::exec()
  sofa::gui::qt::RealGUI::mainLoop()
  sofa::gui::GUIManager::MainLoop(boost::intrusive_ptr<sofa::simulation::Node>, char const*)
  _PyObject_MakeTpCall
  _PyEval_EvalFrameDefault
  _PyFunction_Vectorcall
  PyEval_EvalCodeEx
  PyEval_EvalCode
  PyRun_SimpleFileExFlags
  Py_RunMain
  Py_BytesMain
  __libc_start_main

Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)

I also get the following warning all the time (at the GUI opening), I don't know if it may be linked:

Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
The constructor with a QGLFormat is deprecated, use the regular contructor instead.

So I've tried both with QglViewer and Qt but both quits immediately.

Would you have any ideas to fix this?

Cheers!

Answered by fredroy

Apr 1, 2022

Hi @heloiseouvry ,
Indeed the answer of @BrunoB81HK should be the right one, so it is a bit surprising it still does not work.
Did you make sure that CImgPlugin is built with the support of libpng? Could happen, especially on Windows, that CMake did not find libpng.

As a side note, handling of png/jpeg/etc in the next version of SOFA (june 2022) will be directly supported without needing CImplugin(+libpng,libjpeg) (see #2551 )

View full answer

BrunoB81HK · 2022-03-30T18:29:01Z

BrunoB81HK
Mar 30, 2022

I think I had this error, you need to add the CImgPlugin to load png. You can do it with this line in your scn file :

<RequiredPlugin name="CImgPlugin"/> <!-- Needed to load .png images -->

If this works, this is only a quick fix and the issue will still remain for others. Maybe this plugin should be imported by default?

1 reply

heloiseouvry Mar 31, 2022
Author

Hi @BrunoB81HK,

CImgPlugin is already activated and imported in my code. I'm using SofaPython3 so it's actually SofaRuntime.importPlugin("CImgPlugin") but indeed it's there.

fredroy · 2022-04-01T08:17:24Z

fredroy
Apr 1, 2022
Maintainer

Hi @heloiseouvry ,
Indeed the answer of @BrunoB81HK should be the right one, so it is a bit surprising it still does not work.
Did you make sure that CImgPlugin is built with the support of libpng? Could happen, especially on Windows, that CMake did not find libpng.

As a side note, handling of png/jpeg/etc in the next version of SOFA (june 2022) will be directly supported without needing CImplugin(+libpng,libjpeg) (see #2551 )

5 replies

heloiseouvry Apr 1, 2022
Author

Hi @fredroy ,

How could I make sure CImgPlugin is built with support of libpng?
I forgot to mention but I'm on Ubuntu 20.04.

Also this is what I get when I'm launching my Python script:

/home/heloiseo/miniconda3/bin/python3 /home/heloiseo/projects/examples/beam_deformation/main.py
---------------------------------------
Checking SOFA_ROOT and SOFAPYTHON3_ROOT
Using environment variable SOFA_ROOT: /home/heloiseo/projects/sofa/build/install
Using environment variable SOFAPYTHON3_ROOT: /home/heloiseo/projects/SofaPython3/build/install
---------------------------------------
[WARNING] [qt.conf.h] Cannot open file /home/heloiseo/projects/sofa/build/install/bin/qt.conf
[WARNING] [Sofa.Gui] Failed loading and/or customizing qt.conf from /home/heloiseo/projects/sofa/build/install/bin/qt.conf
qt_resource_data:

[INFO]	[PluginManager] Loaded plugin: /home/heloiseo/projects/sofa/build/install/lib/libSofaComponentAll.so
[INFO]	[PluginManager] Loaded plugin: /home/heloiseo/projects/sofa/build/install/plugins/SofaOpenglVisual/lib/libSofaOpenglVisual.so
[INFO]	[PluginManager] Loaded plugin: /home/heloiseo/projects/sofa/build/install/plugins/CImgPlugin/lib/libCImgPlugin.so
[INFO]	[PluginManager] Loaded plugin: /home/heloiseo/projects/sofa/build/install/lib/libSofaBaseMechanics.so
[WARNING] [SofaEigen2Solver] SofaEigen2Solver is deprecated; Eigen classes are now located in Sofa.LinearAlgebra and SVDLinearSolver in SofaDenseSolver.You can remove SofaEigen2Solver from your scene, and if using SVDLinearSolver, please load SofaDenseSolver instead.
Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
The constructor with a QGLFormat is deprecated, use the regular contructor instead.

fredroy Apr 8, 2022
Maintainer

How could I make sure CImgPlugin is built with support of libpng?

You can have a look at your cmake configuration.
Moreover, you can check if it was linked against libpng.so with the command:

$ ldd lib/libCImgPlugin.so | grep libpng

On my setup, I got

libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fbff8eb9000)

heloiseouvry Apr 8, 2022
Author

OK so it seems that actually libCImgPlugin.so is located in 2 different folders which may be the source of the error.

$ find /home -name libCImgPlugin.so
/home/heloiseo/projects/sofa/build/lib/libCImgPlugin.so
/home/heloiseo/projects/sofa/build/install/plugins/CImgPlugin/lib/libCImgPlugin.so

Indeed when I'm running your command on both files I've got:

$ ldd /home/heloiseo/projects/sofa/build/lib/libCImgPlugin.so | grep libpng
>>> libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f5b1dc52000)

$ ldd /home/heloiseo/projects/sofa/build/install/plugins/CImgPlugin/lib/libCImgPlugin.so | grep libpng
>>>

so only the 1st is linked with libpng.so but it's the 2nd which is loaded at runtime:
[INFO] [PluginManager] Loaded plugin: /home/heloiseo/projects/sofa/build/install/plugins/CImgPlugin/lib/libCImgPlugin.so

fredroy Apr 8, 2022
Maintainer

/home/heloiseo/projects/sofa/build/lib/libCImgPlugin.so
/home/heloiseo/projects/sofa/build/install/plugins/CImgPlugin/lib/libCImgPlugin.so

Did you do a make install ? Both of them are different so I suppose the install/ one is outdated

heloiseouvry Apr 8, 2022
Author

Niiice that was it!
I did make install inside the build folder and now everything is up-to-date and SOFA is no longer crashing when trying to show .png files.
Thanks for walking through this issue with me @fredroy !

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