sub: add --sub-text-bold option

This was basically requested.

DOCS/man/options.rst

@@ -2405,6 +2405,9 @@ OSD
 ``--osd-blur=<0..20.0>``, ``--sub-text-blur=<0..20.0>``
     Gaussian blur factor. 0 means no blur applied (default).
 
+``--osd-bold=<yes|no>``, ``--sub-text-bold=<yes|no>``
+    Format text on bold.
+
 ``--osd-border-color=<color>``, ``--sub-text-border-color=<color>``
     See ``--osd-color``. Color used for the OSD/sub font border.
 

sub/ass_mp.c

@@ -74,6 +74,7 @@ void mp_ass_set_style(ASS_Style *style, double res_y,
     style->ScaleY = 1.;
     style->Alignment = 1 + (opts->align_x + 1) + (opts->align_y + 2) % 3 * 4;
     style->Blur = opts->blur;
+    style->Bold = opts->bold;
 }
 
 // Add default styles, if the track does not have any styles yet.

sub/osd.c

@@ -59,6 +59,7 @@ static const m_option_t style_opts[] = {
     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),
     {0}
 };
 

sub/osd.h

@@ -135,6 +135,7 @@ struct osd_style_opts {
     int align_x;
     int align_y;
     float blur;
+    int bold;
 };
 
 extern const struct m_sub_options osd_style_conf;