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* osd: simplify an aspect of change detection handlingwm42015-03-181-2/+1
| | | | | | | | | | | | | | | | | | There was a somewhat obscure optimization in the OSD and subtitle rendering path: if only the position of the sub-images changed, and not the actual image data, uploading of the image data could be skipped. In theory, this could speed up things like scrolling subtitles. But it turns out that even in the rare cases subtitles have such scrolls or axis-aligned movement, modern libass rarely signals this kind of change. Possibly this is because of sub-pixel handling and such, which break this. As such, it's a worthless optimization and just introduces additional complexity and subtle bugs (especially in cases libass does the opposite: incorrectly signaling a position change only, which happened before). Remove this optimization, and rename bitmap_pos_id to change_id.
* video/out: change aspects of OSD handlingwm42014-06-151-2/+0
| | | | | | | | | Let the VOs draw the OSD on their own, instead of making OSD drawing a separate VO driver call. Further, let it be the VOs responsibility to request subtitles with the correct PTS. We also basically allow the VO to request OSD/subtitles at any time. OSX changes untested.
* sub: uglify OSD code path with lockingwm42014-01-181-0/+68
Do two things: 1. add locking to struct osd_state 2. make struct osd_state opaque While 1. is somewhat simple, 2. is quite horrible. Lots of code accesses lots of osd_state (and osd_object) members. To make sure everything is accessed synchronously, I prefer making osd_state opaque, even if it means adding pretty dumb accessors. All of this is meant to allow running VO in their own threads. Eventually, VOs will request OSD on their own, which means osd_state will be accessed from foreign threads.