updateTasks is called all over ImageDtt right after execSetTilesOffsets (reads gpu_ftasks back to
rebuild TpTask[] with computed centerXY/disp_dist) -> tp_proc_get_tasks (DtoH). getWH returns full
frame (base returns null gpu_clt_wh). Proactive (locating same-cause base-method derefs of null
JCuda fields).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>