Draw sequence in hwc_set --eglSwapBuffers --wait for fb_post. Its ok to draw to External only at this point. --draw to external | Parallel with PAN --commit to external | Parallel with PAN --wait for pan (happening in fb_post) to finish. Call MSMFB_OVERLAY_SET ioctl only when params change. These thing together ensure a correct sequence and should fix tearing and stuttering, the latter assuming there are no other display pipeline delays. Change-Id: Ibb0ad8485fa6b30dc6ac07ae8b25a760941c08ce (cherry picked from commit c50c90863e41e31ecfe6963396b5def35e9dca34)
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