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Add hb_lazy_table_loader_t

This commit is contained in:
Behdad Esfahbod 2017-01-09 22:45:25 -08:00
parent 1af9d924a4
commit ebbcc11122
1 changed files with 40 additions and 0 deletions
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40
src/hb-open-type-private.hh
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@ -30,6 +30,7 @@
#define HB_OPEN_TYPE_PRIVATE_HH #define HB_OPEN_TYPE_PRIVATE_HH
#include "hb-private.hh" #include "hb-private.hh"
#include "hb-face-private.hh"
namespace OT { namespace OT {
@ -1107,6 +1108,45 @@ struct hb_lazy_loader_t
T *instance; T *instance;
}; };
template <typename T>
struct hb_lazy_table_loader_t
{
inline void init (hb_face_t *face_)
{
face = face_;
instance = NULL;
blob = NULL;
}
inline void fini (void)
{
hb_blob_destroy (blob);
}
inline const T* operator-> (void) const
{
retry:
T *p = (T *) hb_atomic_ptr_get (&instance);
if (unlikely (!p))
{
hb_blob_t *blob_ = OT::Sanitizer<T>::sanitize (face->reference_table (T::tableTag));
p = OT::Sanitizer<T>::lock_instance (blob);
if (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), NULL, p))
{
hb_blob_destroy (blob_);
goto retry;
}
blob = blob_;
}
return p;
}
private:
hb_face_t *face;
T *instance;
hb_blob_t *blob;
};
} /* namespace OT */ } /* namespace OT */