quick/scenegraph/qsgdefaultdistancefieldglyphcache.cpp
443:            m_funcs->glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, i, 0, i, oldWidth, 1);
445:        m_funcs->glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight);