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[lazy] Make hb_lazy_loader_t<> more usable

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This commit is contained in:
Behdad Esfahbod 2018-08-12 16:57:06 -07:00
parent bb905e9afc
commit 6901090945
2 changed files with 37 additions and 27 deletions
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7
src/hb-ft.cc
View File

@ -685,9 +685,8 @@ hb_ft_font_create_referenced (FT_Face ft_face)
static void free_static_ft_library (void);
static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_ft_library_lazy_loader_t,
void, 0,
hb_remove_ptr_t<FT_Library>::value>
static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_ptr_t<FT_Library>::value,
hb_ft_library_lazy_loader_t>
{
static inline FT_Library create (void)
{
@ -705,7 +704,7 @@ static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_ft_library_lazy_
{
FT_Done_FreeType (l);
}
static inline const FT_Library get_null (void)
static inline FT_Library get_null (void)
{
return nullptr;
}

57
src/hb-machinery-private.hh
View File

@ -610,20 +610,27 @@ struct hb_data_wrapper_t
template <>
struct hb_data_wrapper_t<void, 0>
{
template <typename Stored, typename Subclass>
template <typename Stored, typename Funcs>
inline Stored * call_create (void) const
{
return Subclass::create ();
return Funcs::create ();
}
};
template <typename Subclass,
typename Data,
unsigned int WheresData,
typename Returned,
template <typename T1, typename T2> struct hb_non_void_t { typedef T1 value; };
template <typename T2> struct hb_non_void_t<void, T2> { typedef T2 value; };
template <typename Returned,
typename Subclass = void,
typename Data = void,
unsigned int WheresData = 0,
typename Stored = Returned>
struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
{
typedef typename hb_non_void_t<Subclass,
hb_lazy_loader_t<Returned,Subclass,Data,WheresData,Stored>
>::value Funcs;
inline void init0 (void) {} /* Init, when memory is already set to 0. No-op for us. */
inline void init (void) { instance.set_relaxed (nullptr); }
inline void fini (void)
@ -641,15 +648,15 @@ struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
inline Stored * do_create (void) const
{
Stored *p = this->template call_create<Stored, Subclass> ();
Stored *p = this->template call_create<Stored, Funcs> ();
if (unlikely (!p))
p = const_cast<Stored *> (Subclass::get_null ());
p = const_cast<Stored *> (Funcs::get_null ());
return p;
}
static inline void do_destroy (Stored *p)
{
if (p && p != Subclass::get_null ())
Subclass::destroy (p);
if (p && p != Funcs::get_null ())
Funcs::destroy (p);
}
inline const Returned * operator -> (void) const { return get (); }
@ -687,8 +694,8 @@ struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
do_destroy (p);
}
inline const Returned * get (void) const { return Subclass::convert (get_stored ()); }
inline Returned * get_unconst (void) const { return const_cast<Returned *> (Subclass::convert (get_stored ())); }
inline const Returned * get (void) const { return Funcs::convert (get_stored ()); }
inline Returned * get_unconst (void) const { return const_cast<Returned *> (Funcs::convert (get_stored ())); }
/* To be possibly overloaded by subclasses. */
static inline const Returned* convert (const Stored *p) { return p; }
@ -703,6 +710,13 @@ struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
p->init (data);
return p;
}
static inline Stored *create (void)
{
Stored *p = (Stored *) calloc (1, sizeof (Stored));
if (likely (p))
p->init ();
return p;
}
static inline void destroy (Stored *p)
{
p->fini ();
@ -717,14 +731,15 @@ struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
/* Specializations. */
template <unsigned int WheresFace, typename T>
struct hb_face_lazy_loader_t : hb_lazy_loader_t<hb_face_lazy_loader_t<WheresFace, T>,
hb_face_t, WheresFace,
T> {};
struct hb_face_lazy_loader_t : hb_lazy_loader_t<T,
hb_face_lazy_loader_t<WheresFace, T>,
hb_face_t, WheresFace> {};
template <typename T, unsigned int WheresFace>
struct hb_table_lazy_loader_t : hb_lazy_loader_t<hb_table_lazy_loader_t<T, WheresFace>,
struct hb_table_lazy_loader_t : hb_lazy_loader_t<T,
hb_table_lazy_loader_t<T, WheresFace>,
hb_face_t, WheresFace,
T, hb_blob_t>
hb_blob_t>
{
static inline hb_blob_t *create (hb_face_t *face)
{
@ -750,9 +765,7 @@ struct hb_table_lazy_loader_t : hb_lazy_loader_t<hb_table_lazy_loader_t<T, Where
};
template <typename Subclass>
struct hb_font_funcs_lazy_loader_t : hb_lazy_loader_t<Subclass,
void, 0,
hb_font_funcs_t>
struct hb_font_funcs_lazy_loader_t : hb_lazy_loader_t<hb_font_funcs_t, Subclass>
{
static inline void destroy (hb_font_funcs_t *p)
{
@ -764,9 +777,7 @@ struct hb_font_funcs_lazy_loader_t : hb_lazy_loader_t<Subclass,
}
};
template <typename Subclass>
struct hb_unicode_funcs_lazy_loader_t : hb_lazy_loader_t<Subclass,
void, 0,
hb_unicode_funcs_t>
struct hb_unicode_funcs_lazy_loader_t : hb_lazy_loader_t<hb_unicode_funcs_t, Subclass>
{
static inline void destroy (hb_unicode_funcs_t *p)
{