Function basename_of

examples/main_image.cpp:42–45

static constexpr int N_COLORS = sizeof(INSTANCE_COLORS) / sizeof(INSTANCE_COLORS[0]);

static std::string basename_of(const std::string& path) {
    auto pos = path.find_last_of("/\\");
    return (pos == std::string::npos) ? path : path.substr(pos + 1);
}

static void apply_theme() {
    ImGuiStyle& s = ImGui::GetStyle();