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if(m_touch_callback!=nullptr) {
    point16 locs[2];
    size_t locs_size = sizeof(locs);
    m_touch_callback(locs,&locs_size,m_touch_callback_state);
    if(locs_size>0) {
        if(m_last_touched!=nullptr) {
            m_last_touched->on_touch(locs_size,locs);
        } else {
            control_type* target = nullptr;
            for(control_type** ctl_it = m_controls.begin();ctl_it!=m_controls.end();++ctl_it) {
                control_type* pctl = *ctl_it;
                if(pctl->bounds().intersects((spoint16)locs[0])) {
                    target = pctl;
                }
            }
            if(target!=nullptr) {
                m_last_touched = target;
                target->on_touch(locs_size,locs);
            }
        }
    } else {
        if(m_last_touched!=nullptr) {
            m_last_touched->on_release();
            m_last_touched = nullptr;
        }
    }
}
if(m_flush_callback!=nullptr && m_flushing<(1+(m_buffer2!=nullptr)) && m_dirty_rects.size()!=0) {
    if(m_it_dirties==nullptr) {
        m_it_dirties = m_dirty_rects.cbegin();
        size_t bmp_stride = bitmap_type::sizeof_buffer(size16(m_it_dirties->width(),1));
        m_bmp_lines = m_buffer_size/bmp_stride;
        if(bmp_stride>m_buffer_size) {
            return uix_result::out_of_memory;
        }
        m_bmp_y = 0;
    } else {
        if(m_bmp_y>=m_it_dirties->height()) {
            ++m_it_dirties;
            if(m_it_dirties==m_dirty_rects.cend()) {
                m_it_dirties = nullptr;
                m_dirty_rects.clear();
                return uix_result::success;
            }
            size_t bmp_stride = bitmap_type::sizeof_buffer(size16(m_it_dirties->width(),1));
            m_bmp_lines = m_buffer_size/bmp_stride;
            if(bmp_stride>m_buffer_size) {
                return uix_result::out_of_memory;
            }
            m_bmp_y = 0;
        } else {
            m_bmp_y+=m_bmp_lines;
        }
    }
    srect16 subrect(m_it_dirties->x1,m_it_dirties->y1+m_bmp_y,m_it_dirties->x2,m_it_dirties->y1+m_bmp_lines+m_bmp_y);
    subrect=subrect.crop((srect16)*m_it_dirties);
    bitmap_type bmp(size16(subrect.dimensions().width,m_bmp_lines),m_write_buffer,m_palette);
    bmp.fill(bmp.bounds(),m_background_color);
    for(control_type** ctl_it = m_controls.begin();ctl_it!=m_controls.end();++ctl_it) {
        control_type* pctl = *ctl_it;
        if(pctl->bounds().intersects(subrect)) {
            srect16 surface_rect = pctl->bounds();
            surface_rect.offset_inplace(-subrect.x1,-subrect.y1);
            control_surface_type surface(bmp,surface_rect);
            pctl->on_render(surface);
        }
    }
    ++m_flushing;
    m_flush_callback((point16)subrect.top_left(),bmp,m_flush_callback_state);
    switch_buffers();
}
return uix_result::success;