fontselect: coretext: allow selection based on PostScript name

Up until now fontselect used the face index to identify which font to load
from a font collection. While this pretty convenient when using something
freetype based like fontconfig, it seems to be somewhat freetype specific.

CoreText uses the PostScript name as the unique identifier of a font. This
commit allows to use that instead of the index to decide which face to open
with FT_New_Face. To use the PostScript name the provider must return a -1
index and the PostScript name.

1 files changed, 2 insertions, 1 deletions

diff --git a/libass/ass.h b/libass/ass.h
index d6728ed..1f8a506 100644
--- a/libass/ass.h
+++ b/libass/ass.h
@@ -453,6 +453,7 @@ ass_create_font_provider(ASS_Renderer *priv, ASS_FontProviderFuncs *funcs,
  * \param meta font metadata. See struct definition for more information.
  * \param path absolute path to font, or NULL for memory-based fonts
  * \param index index inside a font collection file
+ * \param psname PostScript name of the face (overrides index if present)
  * \param data private data for font callbacks
  * \return success
  *
@@ -460,7 +461,7 @@ ass_create_font_provider(ASS_Renderer *priv, ASS_FontProviderFuncs *funcs,
 int
 ass_font_provider_add_font(ASS_FontProvider *provider,
                            ASS_FontProviderMetaData *meta, const char *path,
-                           unsigned int index, void *data);
+                           unsigned int index, const char *psname, void *data);
 
 /**
  * \brief Free font provider and associated fonts.