[FontConfig] [osg] [OsgEarth] Fontconfig error: Cannot load default config file: No such file: (null)

[coderc264]

Describe the bug
i am trying to get a small test program to work. but at run time i get this error:
Fontconfig error: Cannot load default config file: No such file: (null)
i'm tried to put the "/installed\x64-windows\etc\fonts" in the path varable but doesn't work

Environment

• OS: Windows 11
• Compiler:Microsoft Visual Studio Community 2022 (64 bit) - Current Version 17.2.3

To Reproduce
Steps to reproduce the behavior:

1. ./vcpkg install osg:x64-windows osgearth:x64-windows
2. See error
   Repro code when

Expected behavior
Fontconfig error: Cannot load default config file: No such file: (null)
Error reading file C:/WINDOWS/fonts\CascadiaCode.ttf: file not handled
Error reading file ..\tests\openstreetmap_flat.earth: file not handled
[osgEarth]* [MapNodeHelper] No valid earth file loaded - aborting
[osgEarth]

Code
`//#include <osgEarth/ImGui/ImGui>
#include <osgEarth/EarthManipulator>
#include <osgEarth/ExampleResources>
#include <osgEarth/Metrics>
#include <osgViewer/Viewer>

#define LC "[imgui] "

using namespace osgEarth;
using namespace osgEarth::Util;

int
usage(const char* name)
{
OE_NOTICE
<< "\nUsage: " << name << " file.earth" << std::endl
<< MapNodeHelper().usage() << std::endl;
return 0;
}

int
main(int argc, char** argv)
{
osgEarth::initialize();

osg::ArgumentParser arguments(&argc, argv);
if (arguments.read("--help"))
    return usage(argv[0]);

osgViewer::Viewer viewer(arguments);
viewer.setThreadingModel(viewer.SingleThreaded);
viewer.setCameraManipulator(new EarthManipulator(arguments));

// Call this to enable ImGui rendering.
// If you use the MapNodeHelper, call this first.
//viewer.setRealizeOperation(new GUI::ApplicationGUI::RealizeOperation);

osg::ref_ptr<osg::Node> node = MapNodeHelper().loadWithoutControls(arguments, &viewer);
if (node.valid())
{
    // Call this to add the GUI. 
    // Passing "true" tells it to install all the built-in osgEarth GUI tools.
    // Put it on the front of the list so events don't filter
    // through to other handlers.
  //  viewer.getEventHandlers().push_front(new GUI::ApplicationGUI(arguments, true));
    viewer.setSceneData(node);
    return Metrics::run(viewer);
}
else
{
    return usage(argv[0]);
}

}`

[Adela0814]

Please provide the full failure logs.

[coderc264]

I solved it by setting the system variabile FONTCONFIG_FILE to "\installed\x64-windows\etc\fonts\fonts.conf"

[DaXiaWei]

@coderc264 How to configure this file after porting the program, without using environment variables? I tried to put it in the program root directory, but it didn't work

[tomwillow]

@coderc264 How to configure this file after porting the program, without using environment variables? I tried to put it in the program root directory, but it didn't work

I put the fonts folder at exe's directory, it works. No need environment variables.

like this:

my app path: D:\project\build_osgearth_demo\Debug\myApp.exe
fonts path: D:\lib\vcpkg\installed\x64-windows\etc\fonts -> D:\project\build_osgearth_demo\Debug\fonts