// Redraw everything on the screen and flip the screen (make it visible).
// Should only be called with gUpdateMutex locked.
static void update_screen_locked(void) {
    if (!ui_has_initialized)
        return;

    draw_screen_locked();
    gr_flip();
}

// Updates only the progress bar, if possible, otherwise redraws the screen.
// Should only be called with updateMutex locked.
void ScreenRecoveryUI::update_progress_locked() {
    if (show_text || !pagesIdentical) {
        draw_screen_locked();    // Must redraw the whole screen
        pagesIdentical = true;
    } else {
        draw_progress_locked();  // Draw only the progress bar and overlays
    }
    gr_flip();
}

// Updates only the progress bar, if possible, otherwise redraws the screen.
// Should only be called with gUpdateMutex locked.
static void update_progress_locked(void)
{
    if (show_text || !gPagesIdentical) {
        draw_screen_locked();    // Must redraw the whole screen
        gPagesIdentical = 1;
    } else {
        draw_progress_locked();  // Draw only the progress bar
    }
    gr_flip();
}

void ScreenRecoveryUI::progress_loop() {
    double interval = 1.0 / animation_fps;
    for (;;) {
        pthread_mutex_lock(&updateMutex);
        if (progressBarType == EMPTY && !update_waiting)
            pthread_cond_wait(&progressCondition, &updateMutex);

        bool redraw = false;
        double start = now();

        LOGV("loop %f show_text=%d progressBarType=%d waiting=%d\n", start, show_text, progressBarType, update_waiting );

        // update the installation animation, if active
        // skip this if we have a text overlay (too expensive to update)
        if ((currentIcon == INSTALLING_UPDATE || currentIcon == ERASING) &&
            installing_frames > 0) {
            installingFrame = (installingFrame + 1) % installing_frames;
            redraw = true;
        }

        // move the progress bar forward on timed intervals, if configured
        int duration = progressScopeDuration;
        if (progressBarType == DETERMINATE && duration > 0) {
            double elapsed = now() - progressScopeTime;
            float p = 1.0 * elapsed / duration;
            if (p > 1.0) p = 1.0;
            if (p > progress) {
                progress = p;
                redraw = true;
            }
        }

        if (update_waiting || !pagesIdentical) {
            LOGV("call draw_screen_locked\n");
            draw_screen_locked();
            if (!update_waiting)
                pagesIdentical = true;
        }

        if (redraw) {
            LOGV("call draw_progress_locked\n");
            draw_progress_locked();
        }
        gr_flip();

        update_waiting = false;
        pthread_mutex_unlock(&updateMutex);

        double end = now();
        // minimum of 20ms delay between frames
        double delay = interval - (end-start);
        if (delay < 0.02) delay = 0.02;
        usleep((long)(delay * 1000000));
    }
}

// Updates only the progress bar, if possible, otherwise redraws the screen.
// Should only be called with gUpdateMutex locked.
static void update_progress_locked(void)
{
    if (!ui_has_initialized) return;
    if (show_text || !gPagesIdentical) {
        draw_screen_locked();    // Must redraw the whole screen
        gPagesIdentical = 1;
    } else {
        draw_progress_locked();  // Draw only the progress bar and overlays
    }
    gr_flip();
}

// Updates only the progress bar, if possible, otherwise redraws the screen.
// Should only be called with gUpdateMutex locked.
static void update_progress_locked(void) {
    if (!ui_has_initialized)
        return;

    // set minimum delay between progress updates if we have a text overlay
    // exception: gProgressScopeDuration != 0: to keep zip installer refresh behavior
    struct timeval curtime;
    gettimeofday(&curtime, NULL);
    long delta_ms = delta_milliseconds(lastprogupd, curtime);
    if (show_text && gProgressScopeDuration == 0 && lastprogupd.tv_sec > 0
            && delta_ms < UI_MIN_PROG_DELTA_MS) {
        return;
    }

    if (show_text || !gPagesIdentical) {
        draw_screen_locked();    // Must redraw the whole screen
        gPagesIdentical = 1;
    } else {
        draw_progress_locked();  // Draw only the progress bar and overlays
    }
    gr_flip();
}

// Redraw everything on the screen and flip the screen (make it visible).
// Should only be called with updateMutex locked.
void ScreenRecoveryUI::update_screen_locked()
{
    draw_screen_locked();
    gr_flip();
}

// Redraw everything on the screen and flip the screen (make it visible).
// Should only be called with gUpdateMutex locked.
static void update_screen_locked(void)
{
    draw_screen_locked();
    gr_flip();
}