OSG. Fixed size texture problem

#include <osg/MatrixTransform>
#include <osg/Texture2D>
#include <osg/Geode>
#include <osg/AutoTransform>

#include <osgDB/ReadFile>

#include <osgViewer/Viewer>

osg::ref_ptr<osg::Node> createFixedSizeTexture(double x, double y, osg::Image *image)
{
    float imageWidth = image->s();
    float imageHeight = image->t();

    osg::Vec3Array* verts = new osg::Vec3Array(4);
    (*verts)[0] = osg::Vec3(x - imageWidth/2.0f, y - imageHeight/2.0, 0.0f);
    (*verts)[1] = osg::Vec3(x + imageWidth/2.0f, y - imageHeight/2.0, 0.0f);
    (*verts)[2] = osg::Vec3(x + imageWidth/2.0f, y + imageHeight/2.0, 0.0f);
    (*verts)[3] = osg::Vec3(x - imageWidth/2.0f, y + imageHeight/2.0, 0.0f);

    osg::Vec2Array* texcoords = new osg::Vec2Array(4);
    (*texcoords)[0].set(0.0f , 0.0f);
    (*texcoords)[1].set(1.0f , 0.0f);
    (*texcoords)[2].set(1.0f , 1.0f);
    (*texcoords)[3].set(0.0f , 1.0f);

    osg::Vec4Array* colors = new osg::Vec4Array(1);
    (*colors)[0].set(1, 1, 1, 1);

    osg::Geometry* geometry = new osg::Geometry;
    geometry->setVertexArray( verts );
    geometry->setTexCoordArray(0, texcoords);
    geometry->setColorArray( colors );
    geometry->setColorBinding( osg::Geometry::BIND_OVERALL );
    geometry->addPrimitiveSet( new osg::DrawArrays(GL_QUADS, 0, 4));

    osg::Texture2D* texture = new osg::Texture2D( image );
    texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::NEAREST);
    texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::NEAREST);

    osg::StateSet* stateSet = geometry->getOrCreateStateSet();
    stateSet->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
    stateSet->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
    stateSet->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

    osg::Geode* geode = new osg::Geode;
    geode->addDrawable( geometry );

    return geode;
}

int main(int argc, char **argv)
{
    osg::setNotifyLevel(osg::WARN);

    osg::AutoTransform *at = new osg::AutoTransform;
    at->setAutoScaleToScreen(true);
    at->setAutoRotateMode( osg::AutoTransform::ROTATE_TO_SCREEN );

    osg::ref_ptr<osg::Image> image = osgDB::readImageFile("track_8x8.png");
    at->addChild(createFixedSizeTexture(0, 0, image.get()));

    osgViewer::Viewer viewer;
    viewer.setUpViewInWindow(0, 0, 640, 480);
    viewer.setSceneData(at);

    return viewer.run();
}