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[coretext] Pass correct font size to CoreText 

CoreText "point"s are not typographic points, but CSS pixels.  Ie.
they are 96 per inch, not 72 per inch.
This commit is contained in:
Behdad Esfahbod 2017-10-13 10:21:07 +02:00
parent 4f9a83ec21
commit 95883fc5d4
1 changed files with 11 additions and 7 deletions
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18
src/hb-coretext.cc
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@ -38,7 +38,14 @@
#endif
/* https://developer.apple.com/documentation/coretext/1508745-ctfontcreatewithgraphicsfont */
#define HB_CORETEXT_DEFAULT_FONT_SIZE 12.0
#define HB_CORETEXT_DEFAULT_FONT_SIZE 12f
static CGFloat
coretext_font_size (float ptem)
{
ptem *= 96f / 72f;
return ptem <= 0f ? HB_CORETEXT_DEFAULT_FONT_SIZE : ptem;
}
static void
release_table_data (void *user_data)
@ -77,11 +84,10 @@ hb_coretext_face_create (CGFontRef cg_font)
return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), _hb_cg_font_release);
}
HB_SHAPER_DATA_ENSURE_DEFINE(coretext, face)
HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(coretext, font,
fabs (CTFontGetSize((CTFontRef) data) -
(font->ptem <= 0 ? HB_CORETEXT_DEFAULT_FONT_SIZE : font->ptem)) <= .5)
fabs (CTFontGetSize((CTFontRef) data) - coretext_font_size (font->ptem)) <= .5
)
/*
* shaper face data
@ -280,9 +286,7 @@ _hb_coretext_shaper_font_data_create (hb_font_t *font)
if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;
CGFontRef cg_font = (CGFontRef) HB_SHAPER_DATA_GET (face);
float ptem = font->ptem <= 0 ? HB_CORETEXT_DEFAULT_FONT_SIZE : font->ptem;
CTFontRef ct_font = create_ct_font (cg_font, ptem);
CTFontRef ct_font = create_ct_font (cg_font, coretext_font_size (font->ptem));
if (unlikely (!ct_font))
{