fontselect: find fonts with PostScript outlines by PostScript name

Fonts without PostScript outlines (such as TrueType fonts) are unaffected,
and their PostScript names continue to be ignored when searching for fonts.

This matches the behavior of GDI and hence VSFilter.

1 files changed, 15 insertions, 0 deletions

diff --git a/libass/ass_coretext.c b/libass/ass_coretext.c
index a2cd77f..006547b 100644
--- a/libass/ass_coretext.c
+++ b/libass/ass_coretext.c
@@ -88,6 +88,19 @@ static void get_name(CTFontDescriptorRef fontd, CFStringRef attr,
     }
 }
 
+static bool is_postscript(CTFontDescriptorRef fontd)
+{
+    int format;
+    CFNumberRef cfformat =
+        CTFontDescriptorCopyAttribute(fontd, kCTFontFormatAttribute);
+
+    if (!CFNumberGetValue(cfformat, kCFNumberIntType, &format))
+        return false;
+
+    return format == kCTFontFormatOpenTypePostScript ||
+           format == kCTFontFormatPostScript;
+}
+
 static void get_trait(CFDictionaryRef traits, CFStringRef attribute,
                       float *trait)
 {
@@ -192,6 +205,8 @@ static void process_descriptors(ASS_FontProvider *provider, CFArrayRef fontsd)
         get_name(fontd, kCTFontNameAttribute, identifiers, &zero);
         meta.postscript_name = identifiers[0];
 
+        meta.is_postscript = is_postscript(fontd);
+
         CFCharacterSetRef chset =
             CTFontDescriptorCopyAttribute(fontd, kCTFontCharacterSetAttribute);
         ass_font_provider_add_font(provider, &meta, path, index, (void*)chset);