Refactor the DVD subpicture compositing, switching it to 8-bit alpha
calculations. Reuse some of the resulting code to implement PGS
subpicture blending.
Implement parsing and collecting of composition objects properly, but
assuming a single active window and colour palette for now. I need more
PGS samples.
Original commit message from CVS:
* gst/dvdspu/gstdvdspu-render.c: (gst_dvd_spu_render_spu):
* gst/dvdspu/gstdvdspu.c: (dvdspu_debug), (GST_CAT_DEFAULT),
(subpic_sink_factory), (gst_dvd_spu_base_init),
(gst_dvd_spu_class_init), (gst_dvd_spu_init), (gst_dvd_spu_clear),
(gst_dvd_spu_dispose), (gst_dvd_spu_finalize),
(gst_dvd_spu_flush_spu_info), (gst_dvd_spu_buffer_alloc),
(gst_dvd_spu_src_event), (gst_dvd_spu_video_set_caps),
(gst_dvd_spu_video_proxy_getcaps), (gst_dvd_spu_video_event),
(gst_dvd_spu_video_chain), (dvspu_handle_vid_buffer),
(gst_dvd_spu_redraw_still), (gst_dvd_spu_parse_chg_colcon),
(gst_dvd_spu_exec_cmd_blk), (gst_dvd_spu_finish_spu_buf),
(gst_dvd_spu_setup_cmd_blk), (gst_dvd_spu_handle_new_spu_buf),
(gst_dvd_spu_handle_dvd_event), (gst_dvd_spu_advance_spu),
(gst_dvd_spu_check_still_updates), (gst_dvd_spu_subpic_chain),
(gst_dvd_spu_subpic_event), (gst_dvd_spu_change_state),
(gst_dvd_spu_plugin_init):
* gst/dvdspu/gstdvdspu.h: (GST_TYPE_DVD_SPU):
Fix up dvdspu element again after previous namespace mangling:
rename debug category variable to old name, matching that in
dvdspu-render.c, to avoid undefined symbol error when loading
the module; same for the _render function in dvdspu-render.c:
we must use the same name in both .c files; change functions
now called gstgst_* back to gst_* again; and while we're at it,
we may as well canonicalise the namespace properly, namely to
gst_dvd_spu_*.
