<s>
Core	B-Operating_System
Text	I-Operating_System
is	O
a	O
Core	B-Operating_System
Foundation	I-Operating_System
style	O
API	B-Application
in	O
macOS	B-Application
,	O
first	O
introduced	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
10.4	I-Application
Tiger	I-Application
,	O
made	O
public	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
10.5	I-Application
Leopard	I-Application
,	O
and	O
introduced	O
for	O
the	O
iPad	B-Device
with	O
iPhone	O
SDK	O
3.2	O
.	O
</s>
<s>
Exposing	O
a	O
C	B-Language
API	B-Application
,	O
it	O
replaces	O
the	O
text	O
rendering	O
abilities	O
of	O
the	O
now-deprecated	O
QuickDraw	B-Operating_System
and	O
ATSUI	B-Operating_System
frameworks	O
in	O
previous	O
versions	O
of	O
Mac	B-Application
OS	I-Application
X	O
.	O
</s>
<s>
According	O
to	O
Apple	O
,	O
Core	B-Operating_System
Text	I-Operating_System
is	O
"	O
designed	O
for	O
high	O
performance	O
and	O
ease	O
of	O
use	O
"	O
and	O
its	O
layout	O
API	B-Application
is	O
"	O
simple	O
,	O
consistent	O
,	O
and	O
tightly	O
integrated	O
with	O
Core	B-Operating_System
Foundation	I-Operating_System
,	O
Core	O
Graphics	O
,	O
and	O
Cocoa.	O
"	O
</s>
<s>
Core	B-Operating_System
Text	I-Operating_System
provides	O
the	O
following	O
opaque	O
types	O
:	O
</s>
