Bitmap subtitle zoom and position - #76
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Carry of the pending upstream PR xbmc/xbmc#29060 so the feature is usable on frame-packed 3D hardware before Kodi v23 opens. Adds subtitles.bitmapzoom and subtitles.bitmapposition, letting PGS and VobSub be resized and moved onto the existing position and vertical margin settings. String ids 39213-39218; 39211/39212 are taken by CoreELEC's own subtitle language setting.
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Rebased onto the current tip now that the NAL length size fix has landed; this is a single commit against it.
Description
Picture-based subtitles (PGS, VobSub) are drawn at the size and position the disc authored, and Kodi's "Position on screen" and "Vertical margin" settings do not apply to them. On a frame-packed 3D projector the authored size is often too large to read comfortably, and there is no way to move them off the bottom edge.
This adds two settings:
subtitles.bitmapzoom— resize picture-based subtitles, 100% being the authored sizesubtitles.bitmapposition— apply the existing position and vertical margin settings to themOnly bitmap subtitles are affected. DVB subtitles are deliberately excluded: the same codec path also delivers broadcast logos and graphics, which belong where the broadcaster put them. Menu graphics (Blu-ray IG/PG, DVD button highlights) share the overlay classes and are never moved.
Provenance
This is a carry of xbmc/xbmc#29060, which is open upstream, reviewed by reardonia and milestoned
Q* 23.0 Alpha 1— so it is queued for Kodi v23 rather than v22. I am offering it here early because the feature is most useful on exactly the frame-packed 3D hardware CoreELEC serves, and v23 is months out. If upstream merges it, this commit disappears in your next rebase.String ids are 39213-39218: 39211/39212 are taken by CoreELEC's own "Don't show subtitles matching the audio language" setting.
Testing
Homatics Box R 4K Plus, frame-packed 3D over HDMI to a JVC projector. Zoom at 60% and position enabled, verified on screen with PGS subtitles. Defaults (100%, position off) leave rendering byte-identical to before — checked against an unpatched build on a real PGS clip.
Written by my AI co-author (Claude Code); posted from my account.