static int func_display_overlay_l(SDL_Vout *vout, SDL_VoutOverlay *overlay)
{
    SDL_Vout_Opaque *opaque = vout->opaque;
    ANativeWindow *native_window = opaque->native_window;

    if (!native_window) {
        if (!opaque->null_native_window_warned) {
            opaque->null_native_window_warned = 1;
            ALOGW("voud_display_overlay_l: NULL native_window");
        }
        return -1;
    } else {
        opaque->null_native_window_warned = 1;
    }

    if (!overlay) {
        ALOGE("voud_display_overlay_l: NULL overlay");
        return -1;
    }

    if (overlay->w <= 0 || overlay->h <= 0) {
        ALOGE("voud_display_overlay_l: invalid overlay dimensions(%d, %d)", overlay->w, overlay->h);
        return -1;
    }

    switch(overlay->format) {
    case SDL_FCC__AMC:
        return SDL_VoutOverlayAMediaCodec_releaseFrame_l(overlay, NULL, true);
    default:
        return SDL_Android_NativeWindow_display_l(native_window, overlay);
    }
}
static int func_display_overlay_l(SDL_Vout *vout, SDL_VoutOverlay *overlay)
{
    SDL_Vout_Opaque *opaque = vout->opaque;
    ANativeWindow *native_window = opaque->native_window;

    if (!native_window) {
        if (!opaque->null_native_window_warned) {
            opaque->null_native_window_warned = 1;
            ALOGW("voud_display_overlay_l: NULL native_window");
        }
        return -1;
    } else {
        opaque->null_native_window_warned = 1;
    }

    if (!overlay) {
        ALOGE("voud_display_overlay_l: NULL overlay");
        return -1;
    }

    if (overlay->w <= 0 || overlay->h <= 0) {
        ALOGE("voud_display_overlay_l: invalid overlay dimensions(%d, %d)", overlay->w, overlay->h);
        return -1;
    }

    switch(overlay->format) {
    case SDL_FCC__AMC: {
        // only ANativeWindow support
        IJK_EGL_terminate(opaque->egl);
        return SDL_VoutOverlayAMediaCodec_releaseFrame_l(overlay, NULL, true);
    }
    case SDL_FCC_RV24:
    case SDL_FCC_I420:
    case SDL_FCC_I444P10LE: {
        // only GLES support
        if (opaque->egl)
            return IJK_EGL_display(opaque->egl, native_window, overlay);
        break;
    }
    case SDL_FCC_YV12:
    case SDL_FCC_RV16:
    case SDL_FCC_RV32: {
        // both GLES & ANativeWindow support
        if (vout->overlay_format == SDL_FCC__GLES2 && opaque->egl)
            return IJK_EGL_display(opaque->egl, native_window, overlay);
        break;
    }
    }

    // fallback to ANativeWindow
    IJK_EGL_terminate(opaque->egl);
    return SDL_Android_NativeWindow_display_l(native_window, overlay); 
}