internal/uidriver/glfw/ui.go
func (u *UserInterface) glfwSize() (int, int) {
	w := int(float64(u.windowWidth) * u.getScale() * u.glfwScale())
	h := int(float64(u.height) * u.getScale() * u.glfwScale())
	return w, h
}
func (u *UserInterface) glfwSize() (int, int) {
	w := int(float64(u.windowWidth) * u.getScale() * u.glfwScale())
	h := int(float64(u.height) * u.getScale() * u.glfwScale())
	return w, h
}
// getSize must be called from the main thread.