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[coretext] Activate tracking for system fonts 

Another attempt at fully fixing
https://github.com/behdad/harfbuzz/issues/360
This commit is contained in:
Dominik Röttsches 2017-10-12 11:49:37 +02:00
parent 6760021d6f
commit dd4b321b4a
1 changed files with 27 additions and 1 deletions
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28
src/hb-coretext.cc
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@ -150,7 +150,33 @@ create_cg_font (hb_face_t *face)
static CTFontRef
create_ct_font (CGFontRef cg_font, CGFloat font_size)
{
CTFontRef ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, NULL, NULL);
CTFontRef ct_font = NULL;
/* CoreText does not enable trak table usage / tracking when creating a CTFont
* using CTFontCreateWithGraphicsFont. The only way of enabling tracking seems
* to be through the CTFontCreateUIFontForLanguage call. */
CFStringRef cg_postscript_name = CGFontCopyPostScriptName (cg_font);
if (CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSText")) ||
CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSDisplay")))
{
CTFontUIFontType font_type = kCTFontUIFontSystem;
if (CFStringHasSuffix (cg_postscript_name, CFSTR ("-Bold")))
font_type = kCTFontUIFontEmphasizedSystem;
ct_font = CTFontCreateUIFontForLanguage (font_type, font_size, NULL);
CFStringRef ct_result_name = CTFontCopyPostScriptName(ct_font);
if (CFStringCompare (ct_result_name, cg_postscript_name, 0) != kCFCompareEqualTo)
{
CFRelease(ct_font);
ct_font = NULL;
}
CFRelease (ct_result_name);
}
CFRelease (cg_postscript_name);
if (!ct_font)
ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, NULL, NULL);
if (unlikely (!ct_font)) {
DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed");
return NULL;