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[null] Add DECLARE_NULL_NAMESPACE_BYTES_TEMPLATE1

This commit is contained in:
Behdad Esfahbod 2022-07-05 15:44:58 -06:00
parent ea11029a6e
commit 1e503f587b
3 changed files with 14 additions and 15 deletions
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13
src/hb-aat-layout-common.hh
View File

@ -415,18 +415,7 @@ struct Lookup
public:
DEFINE_SIZE_UNION (2, format);
};
/* Lookup 0 has unbounded size (dependant on num_glyphs). So we need to defined
* special NULL objects for Lookup<> objects, but since it's template our macros
* don't work. So we have to hand-code them here. UGLY. */
} /* Close namespace. */
/* Ugly hand-coded null objects for template Lookup<> :(. */
extern HB_INTERNAL const unsigned char _hb_Null_AAT_Lookup[2];
template <typename T>
struct Null<AAT::Lookup<T>> {
static AAT::Lookup<T> const & get_null ()
{ return *reinterpret_cast<const AAT::Lookup<T> *> (_hb_Null_AAT_Lookup); }
};
namespace AAT {
DECLARE_NULL_NAMESPACE_BYTES_TEMPLATE1 (AAT, Lookup, 2);
enum { DELETED_GLYPH = 0xFFFF };

13
src/hb-null.hh
View File

@ -117,8 +117,19 @@ struct NullHelper
}; \
namespace Namespace { \
static_assert (true, "") /* Require semicolon after. */
#define DECLARE_NULL_NAMESPACE_BYTES_TEMPLATE1(Namespace, Type, Size) \
} /* Close namespace. */ \
extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[Size]; \
template <typename Spec> \
struct Null<Namespace::Type<Spec>> { \
static Namespace::Type<Spec> const & get_null () { \
return *reinterpret_cast<const Namespace::Type<Spec> *> (_hb_Null_##Namespace##_##Type); \
} \
}; \
namespace Namespace { \
static_assert (true, "") /* Require semicolon after. */
#define DEFINE_NULL_NAMESPACE_BYTES(Namespace, Type) \
const unsigned char _hb_Null_##Namespace##_##Type[hb_null_size (Namespace::Type)]
const unsigned char _hb_Null_##Namespace##_##Type[sizeof (_hb_Null_##Namespace##_##Type)]
/* Specializations for arbitrary-content Null objects expressed as struct initializer. */
#define DECLARE_NULL_INSTANCE(Type) \

3
src/hb-static.cc
View File

@ -49,8 +49,7 @@ DEFINE_NULL_NAMESPACE_BYTES (OT, LangSys) = {0x00,0x00, 0xFF,0xFF, 0x00,0x00};
DEFINE_NULL_NAMESPACE_BYTES (OT, RangeRecord) = {0x00,0x01, 0x00,0x00, 0x00, 0x00};
DEFINE_NULL_NAMESPACE_BYTES (OT, CmapSubtableLongGroup) = {0x00,0x00,0x00,0x01, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00};
DEFINE_NULL_NAMESPACE_BYTES (AAT, SettingName) = {0xFF,0xFF, 0xFF,0xFF};
/* Hand-coded because Lookup is a template. Sad. */
const unsigned char _hb_Null_AAT_Lookup[2] = {0xFF, 0xFF};
DEFINE_NULL_NAMESPACE_BYTES (AAT, Lookup) = {0xFF,0xFF};
/* hb_map_t */