properly dispatch post-split ncvisual_subtitles()

src/lib/internal.h

@@ -1072,6 +1072,7 @@ typedef struct ncvisual_implementation {
   // have been prepared already in 'ncv'.
   void (*ncvisual_details_seed)(struct ncvisual* ncv);
   void (*ncvisual_details_destroy)(struct ncvisual_details* deets);
+  char* (*ncvisual_subtitle)(const struct ncvisual* ncv);
   bool canopen_images;
   bool canopen_videos;
 } ncvisual_implementation;

src/lib/visual.cpp

@@ -663,8 +663,10 @@ auto ncvisual_stream(notcurses* nc, ncvisual* ncv, float timescale,
 }
 
 auto ncvisual_subtitle(const ncvisual* ncv) -> char* {
-  (void)ncv;
-  return nullptr;
+  if(!visual_implementation){
+    return nullptr;
+  }
+  return visual_implementation->ncvisual_subtitle(ncv);
 }
 
 auto ncvisual_resize(ncvisual* nc, int rows, int cols) -> int {

src/media/ffmpeg.cpp

@@ -112,7 +112,7 @@ deass(const char* ass) {
   return dup;
 }
 
-auto ncvisual_subtitle(const ncvisual* ncv) -> char* {
+auto ffmpeg_subtitle(const ncvisual* ncv) -> char* {
   for(unsigned i = 0 ; i < ncv->details->subtitle.num_rects ; ++i){
     const AVSubtitleRect* rect = ncv->details->subtitle.rects[i];
     if(rect->type == SUBTITLE_ASS){
@@ -584,13 +584,14 @@ auto ncvisual_details_destroy(ncvisual_details* deets) -> void {
   delete deets;
 }
 
-const static ncvisual_implementation ffmpeg_impl = {
+static const ncvisual_implementation ffmpeg_impl = {
   .ncvisual_init = ffmpeg_init,
   .ncvisual_printbanner = ncvisual_printbanner,
   .ncvisual_blit = ffmpeg_blit,
   .ncvisual_create = ncvisual_create,
   .ncvisual_details_seed = ncvisual_details_seed,
   .ncvisual_details_destroy = ncvisual_details_destroy,
+  .ncvisual_subtitle = ffmpeg_subtitle,
   .canopen_images = true,
   .canopen_videos = true,
 };

src/media/oiio.cpp

@@ -227,7 +227,7 @@ auto ncvisual_stream(notcurses* nc, ncvisual* ncv, float timescale,
   return -1;
 }
 
-char* ncvisual_subtitle(const ncvisual* ncv) { // no support in OIIO
+char* oiio_subtitle(const ncvisual* ncv) { // no support in OIIO
   (void)ncv;
   return nullptr;
 }
@@ -275,6 +275,7 @@ const static ncvisual_implementation oiio_impl = {
   .ncvisual_create = oiio_create,
   .ncvisual_details_seed = oiio_details_seed,
   .ncvisual_details_destroy = oiio_details_destroy,
+  .ncvisual_subtitle = oiio_subtitle,
   .canopen_images = true,
   .canopen_videos = false,
 };