mpv/sub/osd.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <libavutil/common.h>
#include "common/common.h"
#include "stream/stream.h"
#include "osdep/timer.h"
#include "mpv_talloc.h"
#include "options/m_config.h"
#include "options/options.h"
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#include "common/global.h"
#include "common/msg.h"
#include "player/client.h"
#include "player/command.h"
#include "osd.h"
#include "osd_state.h"
#include "dec_sub.h"
#include "img_convert.h"
#include "draw_bmp.h"
#include "video/mp_image.h"
#include "video/mp_image_pool.h"
#define OPT_BASE_STRUCT struct osd_style_opts
static const m_option_t style_opts[] = {
OPT_STRING("font", font, 0),
OPT_FLOATRANGE("font-size", font_size, 0, 1, 9000),
OPT_COLOR("color", color, 0),
OPT_COLOR("border-color", border_color, 0),
OPT_COLOR("shadow-color", shadow_color, 0),
OPT_COLOR("back-color", back_color, 0),
OPT_FLOAT("border-size", border_size, 0),
OPT_FLOAT("shadow-offset", shadow_offset, 0),
OPT_FLOATRANGE("spacing", spacing, 0, -10, 10),
OPT_INTRANGE("margin-x", margin_x, 0, 0, 300),
OPT_INTRANGE("margin-y", margin_y, 0, 0, 600),
OPT_CHOICE("align-x", align_x, 0,
({"left", -1}, {"center", 0}, {"right", +1})),
OPT_CHOICE("align-y", align_y, 0,
({"top", -1}, {"center", 0}, {"bottom", +1})),
OPT_FLOATRANGE("blur", blur, 0, 0, 20),
OPT_FLAG("bold", bold, 0),
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OPT_FLAG("italic", italic, 0),
OPT_CHOICE("justify", justify, 0,
({"auto", 0}, {"left", 1}, {"center", 2}, {"right", 3})),
{0}
osd: make the OSD and sub font more customizable Make more aspects of the OSD font customizable. This also affects the font used for unstyled subtitles (such as SRT), or when using the --no-ass option. This adds back some customizability that was lost with commit 74e7a1 (osd: use libass for OSD rendering). Removed options: --ass-border-color --ass-color --font --subfont --subfont-text-scale Added options: --osd-color --osd-border --osd-back-color --osd-shadow-color --osd-font --osd-font-size --osd-border-size --osd-margin-x --osd-margin-y --osd-shadow-offset --osd-spacing --sub-scale The font size is now specified in pixels as it would be rendered on a window with a height of 720 pixels. OSD and subtitles are always scaled with the window height, so specifying or expecting an absolute font size doesn't make sense. Such scaled pixel units are used to specify font border etc. as well. (Note: the font size is directly passed to libass. How the fonts are actually rasterized is outside of our control, but in theory ASS font sizes map to "script" pixels and then are scaled to screen size.) The default settings should be about the same, with slight difference due to rounding to the new scales. The OSD and subtitle fonts are not separately configurable. It has limited use and would double the number of newly added options, which would be more confusing than helpful. It could be easily added later, should the need arise. Other small details that change: - ASS_Style.Encoding is not set to -1 for subs anymore (assuming subs use VSFilter direction in -no-ass mode too) - use a different WrapStyle for OSD - ASS forced styles are not applied to OSD
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};
osd: make the OSD and sub font more customizable Make more aspects of the OSD font customizable. This also affects the font used for unstyled subtitles (such as SRT), or when using the --no-ass option. This adds back some customizability that was lost with commit 74e7a1 (osd: use libass for OSD rendering). Removed options: --ass-border-color --ass-color --font --subfont --subfont-text-scale Added options: --osd-color --osd-border --osd-back-color --osd-shadow-color --osd-font --osd-font-size --osd-border-size --osd-margin-x --osd-margin-y --osd-shadow-offset --osd-spacing --sub-scale The font size is now specified in pixels as it would be rendered on a window with a height of 720 pixels. OSD and subtitles are always scaled with the window height, so specifying or expecting an absolute font size doesn't make sense. Such scaled pixel units are used to specify font border etc. as well. (Note: the font size is directly passed to libass. How the fonts are actually rasterized is outside of our control, but in theory ASS font sizes map to "script" pixels and then are scaled to screen size.) The default settings should be about the same, with slight difference due to rounding to the new scales. The OSD and subtitle fonts are not separately configurable. It has limited use and would double the number of newly added options, which would be more confusing than helpful. It could be easily added later, should the need arise. Other small details that change: - ASS_Style.Encoding is not set to -1 for subs anymore (assuming subs use VSFilter direction in -no-ass mode too) - use a different WrapStyle for OSD - ASS forced styles are not applied to OSD
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const struct m_sub_options osd_style_conf = {
.opts = style_opts,
.size = sizeof(struct osd_style_opts),
.defaults = &(const struct osd_style_opts){
.font = "sans-serif",
.font_size = 55,
.color = {255, 255, 255, 255},
.border_color = {0, 0, 0, 255},
.shadow_color = {240, 240, 240, 128},
.border_size = 3,
.shadow_offset = 0,
.margin_x = 25,
.margin_y = 22,
.align_x = -1,
.align_y = -1,
osd: make the OSD and sub font more customizable Make more aspects of the OSD font customizable. This also affects the font used for unstyled subtitles (such as SRT), or when using the --no-ass option. This adds back some customizability that was lost with commit 74e7a1 (osd: use libass for OSD rendering). Removed options: --ass-border-color --ass-color --font --subfont --subfont-text-scale Added options: --osd-color --osd-border --osd-back-color --osd-shadow-color --osd-font --osd-font-size --osd-border-size --osd-margin-x --osd-margin-y --osd-shadow-offset --osd-spacing --sub-scale The font size is now specified in pixels as it would be rendered on a window with a height of 720 pixels. OSD and subtitles are always scaled with the window height, so specifying or expecting an absolute font size doesn't make sense. Such scaled pixel units are used to specify font border etc. as well. (Note: the font size is directly passed to libass. How the fonts are actually rasterized is outside of our control, but in theory ASS font sizes map to "script" pixels and then are scaled to screen size.) The default settings should be about the same, with slight difference due to rounding to the new scales. The OSD and subtitle fonts are not separately configurable. It has limited use and would double the number of newly added options, which would be more confusing than helpful. It could be easily added later, should the need arise. Other small details that change: - ASS_Style.Encoding is not set to -1 for subs anymore (assuming subs use VSFilter direction in -no-ass mode too) - use a different WrapStyle for OSD - ASS forced styles are not applied to OSD
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},
.change_flags = UPDATE_OSD,
};
const struct m_sub_options sub_style_conf = {
.opts = style_opts,
osd: make the OSD and sub font more customizable Make more aspects of the OSD font customizable. This also affects the font used for unstyled subtitles (such as SRT), or when using the --no-ass option. This adds back some customizability that was lost with commit 74e7a1 (osd: use libass for OSD rendering). Removed options: --ass-border-color --ass-color --font --subfont --subfont-text-scale Added options: --osd-color --osd-border --osd-back-color --osd-shadow-color --osd-font --osd-font-size --osd-border-size --osd-margin-x --osd-margin-y --osd-shadow-offset --osd-spacing --sub-scale The font size is now specified in pixels as it would be rendered on a window with a height of 720 pixels. OSD and subtitles are always scaled with the window height, so specifying or expecting an absolute font size doesn't make sense. Such scaled pixel units are used to specify font border etc. as well. (Note: the font size is directly passed to libass. How the fonts are actually rasterized is outside of our control, but in theory ASS font sizes map to "script" pixels and then are scaled to screen size.) The default settings should be about the same, with slight difference due to rounding to the new scales. The OSD and subtitle fonts are not separately configurable. It has limited use and would double the number of newly added options, which would be more confusing than helpful. It could be easily added later, should the need arise. Other small details that change: - ASS_Style.Encoding is not set to -1 for subs anymore (assuming subs use VSFilter direction in -no-ass mode too) - use a different WrapStyle for OSD - ASS forced styles are not applied to OSD
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.size = sizeof(struct osd_style_opts),
.defaults = &(const struct osd_style_opts){
.font = "sans-serif",
.font_size = 55,
.color = {255, 255, 255, 255},
.border_color = {0, 0, 0, 255},
.shadow_color = {240, 240, 240, 128},
.border_size = 3,
.shadow_offset = 0,
.margin_x = 25,
.margin_y = 22,
.align_x = 0,
.align_y = 1,
},
.change_flags = UPDATE_OSD,
osd: make the OSD and sub font more customizable Make more aspects of the OSD font customizable. This also affects the font used for unstyled subtitles (such as SRT), or when using the --no-ass option. This adds back some customizability that was lost with commit 74e7a1 (osd: use libass for OSD rendering). Removed options: --ass-border-color --ass-color --font --subfont --subfont-text-scale Added options: --osd-color --osd-border --osd-back-color --osd-shadow-color --osd-font --osd-font-size --osd-border-size --osd-margin-x --osd-margin-y --osd-shadow-offset --osd-spacing --sub-scale The font size is now specified in pixels as it would be rendered on a window with a height of 720 pixels. OSD and subtitles are always scaled with the window height, so specifying or expecting an absolute font size doesn't make sense. Such scaled pixel units are used to specify font border etc. as well. (Note: the font size is directly passed to libass. How the fonts are actually rasterized is outside of our control, but in theory ASS font sizes map to "script" pixels and then are scaled to screen size.) The default settings should be about the same, with slight difference due to rounding to the new scales. The OSD and subtitle fonts are not separately configurable. It has limited use and would double the number of newly added options, which would be more confusing than helpful. It could be easily added later, should the need arise. Other small details that change: - ASS_Style.Encoding is not set to -1 for subs anymore (assuming subs use VSFilter direction in -no-ass mode too) - use a different WrapStyle for OSD - ASS forced styles are not applied to OSD
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};
bool osd_res_equals(struct mp_osd_res a, struct mp_osd_res b)
{
return a.w == b.w && a.h == b.h && a.ml == b.ml && a.mt == b.mt
&& a.mr == b.mr && a.mb == b.mb
&& a.display_par == b.display_par;
}
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struct osd_state *osd_create(struct mpv_global *global)
{
assert(MAX_OSD_PARTS >= OSDTYPE_COUNT);
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struct osd_state *osd = talloc_zero(NULL, struct osd_state);
*osd = (struct osd_state) {
.opts_cache = m_config_cache_alloc(osd, global, &mp_osd_render_sub_opts),
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.global = global,
.log = mp_log_new(osd, global->log, "osd"),
.force_video_pts = MP_NOPTS_VALUE,
};
pthread_mutex_init(&osd->lock, NULL);
osd->opts = osd->opts_cache->opts;
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct osd_object *obj = talloc(osd, struct osd_object);
*obj = (struct osd_object) {
.type = n,
.text = talloc_strdup(obj, ""),
.progbar_state = {.type = -1},
};
osd->objs[n] = obj;
}
osd->objs[OSDTYPE_SUB]->is_sub = true;
osd->objs[OSDTYPE_SUB2]->is_sub = true;
osd: use libass for OSD rendering The OSD will now be rendered with libass. The old rendering code, which used freetype/fontconfig and did text layout manually, is disabled. To re-enable the old code, use the --disable-libass-osd configure switch. Some switches do nothing with the new code enabled, such as -subalign, -sub-bg-alpha, -sub-bg-color, and many more. (The reason is mostly that the code for rendering unstyled subtitles with libass doesn't make any attempts to support them. Some of them could be supported in theory.) Teletext rendering is not implemented in the new OSD rendering code. I don't have any teletext sources for testing, and since teletext is being phased out world-wide, the need for this is questionable. Note that rendering is extremely inefficient, mostly because the libass output is blended with the extremely strange mplayer OSD format. This could be improved at a later point. Remove most OSD rendering from vo_aa.c, because that was extremely hacky, can't be made work with osd_libass, and didn't work anyway in my tests. Internally, some cleanup is done. Subtitle and OSD related variable declarations were literally all over the place. Move them to sub.h and sub.c, which were hoarding most of these declarations already. Make the player core in mplayer.c free of concerns like bitmap font loading. The old OSD rendering code has been moved to osd_ft.c. The font_load.c and font_load_ft.c are only needed and compiled if the old OSD rendering code is configured.
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osd_init_backend(osd);
return osd;
}
void osd_free(struct osd_state *osd)
{
if (!osd)
return;
osd_destroy_backend(osd);
pthread_mutex_destroy(&osd->lock);
talloc_free(osd);
}
void osd_set_text(struct osd_state *osd, const char *text)
{
pthread_mutex_lock(&osd->lock);
struct osd_object *osd_obj = osd->objs[OSDTYPE_OSD];
if (!text)
text = "";
if (strcmp(osd_obj->text, text) != 0) {
talloc_free(osd_obj->text);
osd_obj->text = talloc_strdup(osd_obj, text);
osd_obj->osd_changed = true;
osd->want_redraw_notification = true;
}
pthread_mutex_unlock(&osd->lock);
}
void osd_set_sub(struct osd_state *osd, int index, struct dec_sub *dec_sub)
{
pthread_mutex_lock(&osd->lock);
if (index >= 0 && index < 2) {
struct osd_object *obj = osd->objs[OSDTYPE_SUB + index];
obj->sub = dec_sub;
obj->vo_change_id += 1;
}
osd->want_redraw_notification = true;
pthread_mutex_unlock(&osd->lock);
}
bool osd_get_render_subs_in_filter(struct osd_state *osd)
{
pthread_mutex_lock(&osd->lock);
bool r = osd->render_subs_in_filter;
pthread_mutex_unlock(&osd->lock);
return r;
}
void osd_set_render_subs_in_filter(struct osd_state *osd, bool s)
{
pthread_mutex_lock(&osd->lock);
osd->render_subs_in_filter = s;
pthread_mutex_unlock(&osd->lock);
}
void osd_set_force_video_pts(struct osd_state *osd, double video_pts)
{
pthread_mutex_lock(&osd->lock);
osd->force_video_pts = video_pts;
pthread_mutex_unlock(&osd->lock);
}
double osd_get_force_video_pts(struct osd_state *osd)
{
pthread_mutex_lock(&osd->lock);
double pts = osd->force_video_pts;
pthread_mutex_unlock(&osd->lock);
return pts;
}
void osd_set_progbar(struct osd_state *osd, struct osd_progbar_state *s)
{
pthread_mutex_lock(&osd->lock);
struct osd_object *osd_obj = osd->objs[OSDTYPE_OSD];
osd_obj->progbar_state.type = s->type;
osd_obj->progbar_state.value = s->value;
osd_obj->progbar_state.num_stops = s->num_stops;
MP_TARRAY_GROW(osd_obj, osd_obj->progbar_state.stops, s->num_stops);
memcpy(osd_obj->progbar_state.stops, s->stops,
sizeof(osd_obj->progbar_state.stops[0]) * s->num_stops);
osd_obj->osd_changed = true;
osd->want_redraw_notification = true;
pthread_mutex_unlock(&osd->lock);
}
void osd_set_external2(struct osd_state *osd, struct sub_bitmaps *imgs)
{
pthread_mutex_lock(&osd->lock);
osd->objs[OSDTYPE_EXTERNAL2]->external2 = imgs;
osd->objs[OSDTYPE_EXTERNAL2]->vo_change_id += 1;
osd->want_redraw_notification = true;
pthread_mutex_unlock(&osd->lock);
}
static void check_obj_resize(struct osd_state *osd, struct mp_osd_res res,
struct osd_object *obj)
{
if (!osd_res_equals(res, obj->vo_res)) {
obj->vo_res = res;
mp_client_broadcast_event(mp_client_api_get_core(osd->global->client_api),
MP_EVENT_WIN_RESIZE, NULL);
}
}
// Optional. Can be called for faster reaction of OSD-generating scripts like
// osc.lua. This can achieve that the resize happens first, so that the OSD is
// generated at the correct resolution the first time the resized frame is
// rendered. Since the OSD doesn't (and can't) wait for the script, this
// increases the time in which the script can react, and also gets rid of the
// unavoidable redraw delay (though it will still be racy).
// Unnecessary for anything else.
void osd_resize(struct osd_state *osd, struct mp_osd_res res)
{
pthread_mutex_lock(&osd->lock);
int types[] = {OSDTYPE_OSD, OSDTYPE_EXTERNAL, OSDTYPE_EXTERNAL2, -1};
for (int n = 0; types[n] >= 0; n++)
check_obj_resize(osd, res, osd->objs[types[n]]);
pthread_mutex_unlock(&osd->lock);
}
static void render_object(struct osd_state *osd, struct osd_object *obj,
struct mp_osd_res res, double video_pts,
const bool sub_formats[SUBBITMAP_COUNT],
struct sub_bitmaps *out_imgs)
{
int format = SUBBITMAP_LIBASS;
if (!sub_formats[format] || osd->opts->force_rgba_osd)
format = SUBBITMAP_RGBA;
*out_imgs = (struct sub_bitmaps) {0};
check_obj_resize(osd, res, obj);
if (obj->type == OSDTYPE_SUB || obj->type == OSDTYPE_SUB2) {
if (obj->sub)
sub_get_bitmaps(obj->sub, obj->vo_res, format, video_pts, out_imgs);
} else if (obj->type == OSDTYPE_EXTERNAL2) {
if (obj->external2 && obj->external2->format) {
*out_imgs = *obj->external2;
obj->external2->change_id = 0;
}
} else {
osd_object_get_bitmaps(osd, obj, format, out_imgs);
}
obj->vo_change_id += out_imgs->change_id;
if (out_imgs->num_parts == 0)
return;
out_imgs->render_index = obj->type;
out_imgs->change_id = obj->vo_change_id;
}
// draw_flags is a bit field of OSD_DRAW_* constants
void osd_draw(struct osd_state *osd, struct mp_osd_res res,
double video_pts, int draw_flags,
const bool formats[SUBBITMAP_COUNT],
void (*cb)(void *ctx, struct sub_bitmaps *imgs), void *cb_ctx)
{
pthread_mutex_lock(&osd->lock);
if (osd->force_video_pts != MP_NOPTS_VALUE)
video_pts = osd->force_video_pts;
if (draw_flags & OSD_DRAW_SUB_FILTER)
draw_flags |= OSD_DRAW_SUB_ONLY;
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct osd_object *obj = osd->objs[n];
// Object is drawn into the video frame itself; don't draw twice
if (osd->render_subs_in_filter && obj->is_sub &&
!(draw_flags & OSD_DRAW_SUB_FILTER))
continue;
if ((draw_flags & OSD_DRAW_SUB_ONLY) && !obj->is_sub)
continue;
if ((draw_flags & OSD_DRAW_OSD_ONLY) && obj->is_sub)
continue;
if (obj->sub)
sub_lock(obj->sub);
struct sub_bitmaps imgs;
render_object(osd, obj, res, video_pts, formats, &imgs);
if (imgs.num_parts > 0) {
if (formats[imgs.format]) {
cb(cb_ctx, &imgs);
} else {
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MP_ERR(osd, "Can't render OSD part %d (format %d).\n",
obj->type, imgs.format);
}
}
if (obj->sub)
sub_unlock(obj->sub);
}
// If this is called with OSD_DRAW_SUB_ONLY or OSD_DRAW_OSD_ONLY set, assume
// it will always draw the complete OSD by doing multiple osd_draw() calls.
// OSD_DRAW_SUB_FILTER on the other hand is an evil special-case, and we
// must not reset the flag when it happens.
if (!(draw_flags & OSD_DRAW_SUB_FILTER))
osd->want_redraw_notification = false;
pthread_mutex_unlock(&osd->lock);
}
struct draw_on_image_closure {
struct osd_state *osd;
struct mp_image *dest;
struct mp_image_pool *pool;
bool changed;
};
static void draw_on_image(void *ctx, struct sub_bitmaps *imgs)
{
struct draw_on_image_closure *closure = ctx;
struct osd_state *osd = closure->osd;
if (!mp_image_pool_make_writeable(closure->pool, closure->dest))
return; // on OOM, skip
mp_draw_sub_bitmaps(&osd->draw_cache, closure->dest, imgs);
talloc_steal(osd, osd->draw_cache);
closure->changed = true;
}
// Calls mp_image_make_writeable() on the dest image if something is drawn.
// Returns whether anything was drawn.
bool osd_draw_on_image(struct osd_state *osd, struct mp_osd_res res,
double video_pts, int draw_flags, struct mp_image *dest)
{
struct draw_on_image_closure closure = {osd, dest};
osd_draw(osd, res, video_pts, draw_flags, mp_draw_sub_formats,
&draw_on_image, &closure);
return closure.changed;
}
// Like osd_draw_on_image(), but if dest needs to be copied to make it
// writeable, allocate images from the given pool. (This is a minor
// optimization to reduce "real" image sized memory allocations.)
void osd_draw_on_image_p(struct osd_state *osd, struct mp_osd_res res,
double video_pts, int draw_flags,
struct mp_image_pool *pool, struct mp_image *dest)
{
struct draw_on_image_closure closure = {osd, dest, pool};
osd_draw(osd, res, video_pts, draw_flags, mp_draw_sub_formats,
&draw_on_image, &closure);
}
// Setup the OSD resolution to render into an image with the given parameters.
// The interesting part about this is that OSD has to compensate the aspect
// ratio if the image does not have a 1:1 pixel aspect ratio.
struct mp_osd_res osd_res_from_image_params(const struct mp_image_params *p)
{
return (struct mp_osd_res) {
.w = p->w,
.h = p->h,
.display_par = p->p_h / (double)p->p_w,
};
}
// Typically called to react to OSD style changes.
void osd_changed(struct osd_state *osd)
{
pthread_mutex_lock(&osd->lock);
osd->objs[OSDTYPE_OSD]->osd_changed = true;
osd->want_redraw_notification = true;
// Done here for a lack of a better place.
m_config_cache_update(osd->opts_cache);
pthread_mutex_unlock(&osd->lock);
osd: use libass for OSD rendering The OSD will now be rendered with libass. The old rendering code, which used freetype/fontconfig and did text layout manually, is disabled. To re-enable the old code, use the --disable-libass-osd configure switch. Some switches do nothing with the new code enabled, such as -subalign, -sub-bg-alpha, -sub-bg-color, and many more. (The reason is mostly that the code for rendering unstyled subtitles with libass doesn't make any attempts to support them. Some of them could be supported in theory.) Teletext rendering is not implemented in the new OSD rendering code. I don't have any teletext sources for testing, and since teletext is being phased out world-wide, the need for this is questionable. Note that rendering is extremely inefficient, mostly because the libass output is blended with the extremely strange mplayer OSD format. This could be improved at a later point. Remove most OSD rendering from vo_aa.c, because that was extremely hacky, can't be made work with osd_libass, and didn't work anyway in my tests. Internally, some cleanup is done. Subtitle and OSD related variable declarations were literally all over the place. Move them to sub.h and sub.c, which were hoarding most of these declarations already. Make the player core in mplayer.c free of concerns like bitmap font loading. The old OSD rendering code has been moved to osd_ft.c. The font_load.c and font_load_ft.c are only needed and compiled if the old OSD rendering code is configured.
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}
bool osd_query_and_reset_want_redraw(struct osd_state *osd)
{
pthread_mutex_lock(&osd->lock);
bool r = osd->want_redraw_notification;
osd->want_redraw_notification = false;
pthread_mutex_unlock(&osd->lock);
return r;
}
struct mp_osd_res osd_get_vo_res(struct osd_state *osd)
{
pthread_mutex_lock(&osd->lock);
// Any OSDTYPE is fine; but it mustn't be a subtitle one (can have lower res.)
struct mp_osd_res res = osd->objs[OSDTYPE_OSD]->vo_res;
pthread_mutex_unlock(&osd->lock);
return res;
2013-12-12 23:19:17 +00:00
}
// Position the subbitmaps in imgs on the screen. Basically, this fits the
// subtitle canvas (of size frame_w x frame_h) onto the screen, such that it
// fills the whole video area (especially if the video is magnified, e.g. on
// fullscreen). If compensate_par is >0, adjust the way the subtitles are
// "stretched" on the screen, and letter-box the result. If compensate_par
// is <0, strictly letter-box the subtitles. If it is 0, stretch them.
void osd_rescale_bitmaps(struct sub_bitmaps *imgs, int frame_w, int frame_h,
struct mp_osd_res res, double compensate_par)
{
int vidw = res.w - res.ml - res.mr;
int vidh = res.h - res.mt - res.mb;
double xscale = (double)vidw / frame_w;
double yscale = (double)vidh / frame_h;
if (compensate_par < 0)
compensate_par = xscale / yscale / res.display_par;
if (compensate_par > 0)
xscale /= compensate_par;
int cx = vidw / 2 - (int)(frame_w * xscale) / 2;
int cy = vidh / 2 - (int)(frame_h * yscale) / 2;
for (int i = 0; i < imgs->num_parts; i++) {
struct sub_bitmap *bi = &imgs->parts[i];
bi->x = (int)(bi->x * xscale) + cx + res.ml;
bi->y = (int)(bi->y * yscale) + cy + res.mt;
bi->dw = (int)(bi->w * xscale + 0.5);
bi->dh = (int)(bi->h * yscale + 0.5);
}
}