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[coretext] Remove old hack now that font layer takes care... 

of invalidating font data when font settings change.
This commit is contained in:
Behdad Esfahbod 2022-06-28 13:30:44 -06:00
parent c1c78ade71
commit c90130e625
1 changed files with 3 additions and 34 deletions
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37
src/hb-coretext.cc
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@ -379,37 +379,6 @@ _hb_coretext_shaper_font_data_destroy (hb_coretext_font_data_t *data)
CFRelease ((CTFontRef) data);
}
static const hb_coretext_font_data_t *
hb_coretext_font_data_sync (hb_font_t *font)
{
retry:
const hb_coretext_font_data_t *data = font->data.coretext;
if (unlikely (!data)) return nullptr;
if (fabs (CTFontGetSize ((CTFontRef) data) - (CGFloat) font->ptem) > (CGFloat) .5)
{
/* XXX-MT-bug
* Note that evaluating condition above can be dangerous if another thread
* got here first and destructed data. That's, as always, bad use pattern.
* If you modify the font (change font size), other threads must not be
* using it at the same time. However, since this check is delayed to
* when one actually tries to shape something, this is a XXX race condition
* (and the only one we have that I know of) right now. Ie. you modify the
* font size in one thread, then (supposedly safely) try to use it from two
* or more threads and BOOM! I'm not sure how to fix this. We want RCU.
*/
/* Drop and recreate. */
/* If someone dropped it in the mean time, throw it away and don't touch it.
* Otherwise, destruct it. */
if (likely (font->data.coretext.cmpexch (const_cast<hb_coretext_font_data_t *> (data), nullptr)))
_hb_coretext_shaper_font_data_destroy (const_cast<hb_coretext_font_data_t *> (data));
else
goto retry;
}
return font->data.coretext;
}
/**
* hb_coretext_font_create:
* @ct_font: The CTFontRef to work upon
@ -455,8 +424,8 @@ hb_coretext_font_create (CTFontRef ct_font)
CTFontRef
hb_coretext_font_get_ct_font (hb_font_t *font)
{
const hb_coretext_font_data_t *data = hb_coretext_font_data_sync (font);
return data ? (CTFontRef) data : nullptr;
CTFontRef ct_font = (CTFontRef) (const void *) font->data.coretext;
return ct_font ? (CTFontRef) ct_font : nullptr;
}
@ -516,7 +485,7 @@ _hb_coretext_shape (hb_shape_plan_t *shape_plan,
{
hb_face_t *face = font->face;
CGFontRef cg_font = (CGFontRef) (const void *) face->data.coretext;
CTFontRef ct_font = (CTFontRef) hb_coretext_font_data_sync (font);
CTFontRef ct_font = (CTFontRef) (const void *) font->data.coretext;
CGFloat ct_font_size = CTFontGetSize (ct_font);
CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size;