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author | wm4 <wm4@nowhere> | 2020-03-06 18:20:11 +0100 |
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committer | wm4 <wm4@nowhere> | 2020-03-06 18:20:11 +0100 |
commit | 7a76b577d85ddc8f9e255b1a1c195ee88b76a7d8 (patch) | |
tree | cf51a99eae3a5356680480a72c6fb81dbb7d8d91 /sub/ass_mp.c | |
parent | c6822b853d7475e8bf3b2c9f6823b7d74cf86950 (diff) | |
download | mpv-7a76b577d85ddc8f9e255b1a1c195ee88b76a7d8.tar.bz2 mpv-7a76b577d85ddc8f9e255b1a1c195ee88b76a7d8.tar.xz |
command: extend osd-overlay command with bounds reporting
This is more or less a minimal hack to make _some_ text measurement
functionality available to scripts. Since libass does not support such a
thing, this simply uses the bounding box of the rendered text.
This is far from ideal. Problems include:
- using a bitmap bounding box
- additional memory waste and/or flushing caches
- dependency on window size
- odd small deviations with different window sizes (run osd-test.lua and
resize the window after each timer update; the bounding boxes aren't
adjusted in an overly useful way)
- inability to query the size _after_ actual rendering
But I guess it's a start. Since I'm aware that it's crap, add a threat
to the manpage that this may be changed/removed again. For now, I'm
interested whether anyone will have use for it in its current form, as
it's an often requested feature.
Diffstat (limited to 'sub/ass_mp.c')
-rw-r--r-- | sub/ass_mp.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/sub/ass_mp.c b/sub/ass_mp.c index d5d9e3e7d6..d214375b61 100644 --- a/sub/ass_mp.c +++ b/sub/ass_mp.c @@ -23,6 +23,7 @@ #include <stdarg.h> #include <stdbool.h> #include <assert.h> +#include <math.h> #include <ass/ass.h> #include <ass/ass_types.h> @@ -385,3 +386,27 @@ void mp_ass_packer_pack(struct mp_ass_packer *p, ASS_Image **image_lists, p->cached_subs.change_id = 0; p->cached_subs_valid = true; } + +// Set *out_rc to [x0, y0, x1, y1] of the graphical bounding box in script +// coordinates. +// Set it to [inf, inf, -inf, -inf] if empty. +void mp_ass_get_bb(ASS_Image *image_list, ASS_Track *track, + struct mp_osd_res *res, double *out_rc) +{ + double rc[4] = {INFINITY, INFINITY, -INFINITY, -INFINITY}; + + for (ASS_Image *img = image_list; img; img = img->next) { + if (img->w == 0 || img->h == 0) + continue; + rc[0] = MPMIN(rc[0], img->dst_x); + rc[1] = MPMIN(rc[1], img->dst_y); + rc[2] = MPMAX(rc[2], img->dst_x + img->w); + rc[3] = MPMAX(rc[3], img->dst_y + img->h); + } + + double scale = track->PlayResY / (double)MPMAX(res->h, 1); + if (scale > 0) { + for (int i = 0; i < 4; i++) + out_rc[i] = rc[i] * scale; + } +} |