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Better hide nil objects and make them const

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This commit is contained in:
Behdad Esfahbod 2012-06-05 12:31:51 -04:00
parent bf93b636c4
commit f06ab8a426
9 changed files with 150 additions and 161 deletions
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34
src/hb-blob.cc
View File

@ -59,19 +59,6 @@ struct _hb_blob_t {
hb_destroy_func_t destroy;
};
static hb_blob_t _hb_blob_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
NULL, /* data */
0, /* length */
HB_MEMORY_MODE_READONLY, /* mode */
NULL, /* user_data */
NULL /* destroy */
};
static bool _try_writable (hb_blob_t *blob);
@ -97,7 +84,7 @@ hb_blob_create (const char *data,
if (!length || !(blob = hb_object_create<hb_blob_t> ())) {
if (destroy)
destroy (user_data);
return &_hb_blob_nil;
return hb_blob_get_empty ();
}
blob->data = data;
@ -111,7 +98,7 @@ hb_blob_create (const char *data,
blob->mode = HB_MEMORY_MODE_READONLY;
if (!_try_writable (blob)) {
hb_blob_destroy (blob);
return &_hb_blob_nil;
return hb_blob_get_empty ();
}
}
@ -126,7 +113,7 @@ hb_blob_create_sub_blob (hb_blob_t *parent,
hb_blob_t *blob;
if (!length || offset >= parent->length)
return &_hb_blob_nil;
return hb_blob_get_empty ();
hb_blob_make_immutable (parent);
@ -142,7 +129,20 @@ hb_blob_create_sub_blob (hb_blob_t *parent,
hb_blob_t *
hb_blob_get_empty (void)
{
return &_hb_blob_nil;
static const hb_blob_t _hb_blob_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
NULL, /* data */
0, /* length */
HB_MEMORY_MODE_READONLY, /* mode */
NULL, /* user_data */
NULL /* destroy */
};
return const_cast<hb_blob_t *> (&_hb_blob_nil);
}
hb_blob_t *

39
src/hb-buffer.cc
View File

@ -37,21 +37,8 @@
#define HB_DEBUG_BUFFER (HB_DEBUG+0)
#endif
static hb_buffer_t _hb_buffer_nil = {
HB_OBJECT_HEADER_STATIC,
&_hb_unicode_funcs_default,
{
HB_DIRECTION_INVALID,
HB_SCRIPT_INVALID,
NULL,
},
TRUE, /* in_error */
TRUE, /* have_output */
TRUE /* have_positions */
};
#define _HB_BUFFER_UNICODE_FUNCS_DEFAULT _hb_unicode_funcs_default
#define _HB_BUFFER_PROPS_DEFAULT { HB_DIRECTION_INVALID, HB_SCRIPT_INVALID, HB_LANGUAGE_INVALID }
/* Here is how the buffer works internally:
*
@ -154,9 +141,10 @@ hb_buffer_t::reset (void)
return;
hb_unicode_funcs_destroy (unicode);
unicode = _hb_buffer_nil.unicode;
unicode = _HB_BUFFER_UNICODE_FUNCS_DEFAULT;
props = _hb_buffer_nil.props;
hb_segment_properties_t default_props = _HB_BUFFER_PROPS_DEFAULT;
props = default_props;
in_error = FALSE;
have_output = FALSE;
@ -543,7 +531,7 @@ hb_buffer_create ()
hb_buffer_t *buffer;
if (!(buffer = hb_object_create<hb_buffer_t> ()))
return &_hb_buffer_nil;
return hb_buffer_get_empty ();
buffer->reset ();
@ -553,7 +541,18 @@ hb_buffer_create ()
hb_buffer_t *
hb_buffer_get_empty (void)
{
return &_hb_buffer_nil;
static const hb_buffer_t _hb_buffer_nil = {
HB_OBJECT_HEADER_STATIC,
_HB_BUFFER_UNICODE_FUNCS_DEFAULT,
_HB_BUFFER_PROPS_DEFAULT,
TRUE, /* in_error */
TRUE, /* have_output */
TRUE /* have_positions */
};
return const_cast<hb_buffer_t *> (&_hb_buffer_nil);
}
hb_buffer_t *
@ -601,7 +600,7 @@ hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
return;
if (!unicode)
unicode = _hb_buffer_nil.unicode;
unicode = _HB_BUFFER_UNICODE_FUNCS_DEFAULT;
hb_unicode_funcs_reference (unicode);
hb_unicode_funcs_destroy (buffer->unicode);

70
src/hb-font.cc
View File

@ -217,7 +217,7 @@ hb_font_get_glyph_from_name_nil (hb_font_t *font,
}
static hb_font_funcs_t _hb_font_funcs_nil = {
static const hb_font_funcs_t _hb_font_funcs_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
@ -236,7 +236,7 @@ hb_font_funcs_create (void)
hb_font_funcs_t *ffuncs;
if (!(ffuncs = hb_object_create<hb_font_funcs_t> ()))
return &_hb_font_funcs_nil;
return hb_font_funcs_get_empty ();
ffuncs->get = _hb_font_funcs_nil.get;
@ -246,7 +246,7 @@ hb_font_funcs_create (void)
hb_font_funcs_t *
hb_font_funcs_get_empty (void)
{
return &_hb_font_funcs_nil;
return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil);
}
hb_font_funcs_t *
@ -578,7 +578,7 @@ hb_font_get_glyph_contour_point_for_origin (hb_font_t *font,
* hb_face_t
*/
static hb_face_t _hb_face_nil = {
static const hb_face_t _hb_face_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
@ -604,7 +604,7 @@ hb_face_create_for_tables (hb_reference_table_func_t reference_table,
if (!reference_table || !(face = hb_object_create<hb_face_t> ())) {
if (destroy)
destroy (user_data);
return &_hb_face_nil;
return hb_face_get_empty ();
}
face->reference_table = reference_table;
@ -671,12 +671,12 @@ hb_face_create (hb_blob_t *blob,
hb_face_t *face;
if (unlikely (!blob || !hb_blob_get_length (blob)))
return &_hb_face_nil;
return hb_face_get_empty ();
hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (Sanitizer<OpenTypeFontFile>::sanitize (hb_blob_reference (blob)), index);
if (unlikely (!closure))
return &_hb_face_nil;
return hb_face_get_empty ();
face = hb_face_create_for_tables (_hb_face_for_data_reference_table,
closure,
@ -690,7 +690,7 @@ hb_face_create (hb_blob_t *blob,
hb_face_t *
hb_face_get_empty (void)
{
return &_hb_face_nil;
return const_cast<hb_face_t *> (&_hb_face_nil);
}
@ -811,40 +811,21 @@ hb_face_get_upem (hb_face_t *face)
* hb_font_t
*/
static hb_font_t _hb_font_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
NULL, /* parent */
&_hb_face_nil,
0, /* x_scale */
0, /* y_scale */
0, /* x_ppem */
0, /* y_ppem */
&_hb_font_funcs_nil, /* klass */
NULL, /* user_data */
NULL /* destroy */
};
hb_font_t *
hb_font_create (hb_face_t *face)
{
hb_font_t *font;
if (unlikely (!face))
face = &_hb_face_nil;
face = hb_face_get_empty ();
if (unlikely (hb_object_is_inert (face)))
return &_hb_font_nil;
return hb_font_get_empty ();
if (!(font = hb_object_create<hb_font_t> ()))
return &_hb_font_nil;
return hb_font_get_empty ();
hb_face_make_immutable (face);
font->face = hb_face_reference (face);
font->klass = &_hb_font_funcs_nil;
font->klass = hb_font_funcs_get_empty ();
return font;
}
@ -853,7 +834,7 @@ hb_font_t *
hb_font_create_sub_font (hb_font_t *parent)
{
if (unlikely (!parent))
return &_hb_font_nil;
return hb_font_get_empty ();
hb_font_t *font = hb_font_create (parent->face);
@ -868,15 +849,32 @@ hb_font_create_sub_font (hb_font_t *parent)
font->x_ppem = parent->x_ppem;
font->y_ppem = parent->y_ppem;
font->klass = &_hb_font_funcs_nil;
return font;
}
hb_font_t *
hb_font_get_empty (void)
{
return &_hb_font_nil;
static const hb_font_t _hb_font_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
NULL, /* parent */
const_cast<hb_face_t *> (&_hb_face_nil),
0, /* x_scale */
0, /* y_scale */
0, /* x_ppem */
0, /* y_ppem */
const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil), /* klass */
NULL, /* user_data */
NULL /* destroy */
};
return const_cast<hb_font_t *> (&_hb_font_nil);
}
hb_font_t *
@ -960,7 +958,7 @@ hb_font_set_funcs (hb_font_t *font,
font->destroy (font->user_data);
if (!klass)
klass = &_hb_font_funcs_nil;
klass = hb_font_funcs_get_empty ();
hb_font_funcs_reference (klass);
hb_font_funcs_destroy (font->klass);

33
src/hb-ft.cc
View File

@ -271,7 +271,10 @@ hb_ft_get_glyph_from_name (hb_font_t *font,
}
static hb_font_funcs_t ft_ffuncs = {
static hb_font_funcs_t *
_hb_ft_get_font_funcs (void)
{
static const hb_font_funcs_t ft_ffuncs = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
@ -283,10 +286,7 @@ static hb_font_funcs_t ft_ffuncs = {
}
};
static hb_font_funcs_t *
_hb_ft_get_font_funcs (void)
{
return &ft_ffuncs;
return const_cast<hb_font_funcs_t *> (&ft_ffuncs);
}
@ -398,26 +398,21 @@ hb_ft_font_create (FT_Face ft_face,
}
static FT_Library ft_library;
static hb_bool_t ft_library_initialized;
static struct ft_library_destructor {
~ft_library_destructor (void) {
if (ft_library)
FT_Done_FreeType (ft_library);
}
} static_ft_library_destructor;
static FT_Library
_get_ft_library (void)
{
if (unlikely (!ft_library_initialized)) {
static struct ft_library_singleton
{
ft_library_singleton (void) {
FT_Init_FreeType (&ft_library);
ft_library_initialized = TRUE;
}
~ft_library_singleton (void) {
FT_Done_FreeType (ft_library);
}
FT_Library ft_library;
} ft_library_singleton;
return ft_library;
return ft_library_singleton.ft_library;
}
static void

11
src/hb-glib.cc
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@ -337,8 +337,10 @@ hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
}
extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_glib;
hb_unicode_funcs_t _hb_glib_unicode_funcs = {
hb_unicode_funcs_t *
hb_glib_get_unicode_funcs (void)
{
static const hb_unicode_funcs_t _hb_glib_unicode_funcs = {
HB_OBJECT_HEADER_STATIC,
NULL, /* parent */
@ -350,9 +352,6 @@ hb_unicode_funcs_t _hb_glib_unicode_funcs = {
}
};
hb_unicode_funcs_t *
hb_glib_get_unicode_funcs (void)
{
return &_hb_glib_unicode_funcs;
return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
}

11
src/hb-icu.cc
View File

@ -269,8 +269,10 @@ hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
return ret;
}
extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_icu;
hb_unicode_funcs_t _hb_icu_unicode_funcs = {
hb_unicode_funcs_t *
hb_icu_get_unicode_funcs (void)
{
static const hb_unicode_funcs_t _hb_icu_unicode_funcs = {
HB_OBJECT_HEADER_STATIC,
NULL, /* parent */
@ -282,10 +284,7 @@ hb_unicode_funcs_t _hb_icu_unicode_funcs = {
}
};
hb_unicode_funcs_t *
hb_icu_get_unicode_funcs (void)
{
return &_hb_icu_unicode_funcs;
return const_cast<hb_unicode_funcs_t *> (&_hb_icu_unicode_funcs);
}

16
src/hb-set.cc
View File

@ -30,12 +30,6 @@
/* Public API */
static hb_set_t _hb_set_nil = {
HB_OBJECT_HEADER_STATIC,
{0} /* elts */
};
hb_set_t *
hb_set_create ()
@ -43,7 +37,7 @@ hb_set_create ()
hb_set_t *set;
if (!(set = hb_object_create<hb_set_t> ()))
return &_hb_set_nil;
return hb_set_get_empty ();
set->clear ();
@ -53,7 +47,13 @@ hb_set_create ()
hb_set_t *
hb_set_get_empty (void)
{
return &_hb_set_nil;
static const hb_set_t _hb_set_nil = {
HB_OBJECT_HEADER_STATIC,
{0} /* elts */
};
return const_cast<hb_set_t *> (&_hb_set_nil);
}
hb_set_t *

11
src/hb-unicode-private.hh
View File

@ -91,15 +91,14 @@ struct _hb_unicode_funcs_t {
#ifdef HAVE_GLIB
extern HB_INTERNAL hb_unicode_funcs_t _hb_glib_unicode_funcs;
#define _hb_unicode_funcs_default _hb_glib_unicode_funcs
extern "C" hb_unicode_funcs_t * hb_glib_get_unicode_funcs (void);
#define _hb_unicode_funcs_default hb_glib_get_unicode_funcs ()
#elif defined(HAVE_ICU)
extern HB_INTERNAL hb_unicode_funcs_t _hb_icu_unicode_funcs;
#define _hb_unicode_funcs_default _hb_icu_unicode_funcs
extern "C" hb_unicode_funcs_t * hb_icu_get_unicode_funcs (void);
#define _hb_unicode_funcs_default hb_icu_get_unicode_funcs ()
#else
#define HB_UNICODE_FUNCS_NIL 1
extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_nil;
#define _hb_unicode_funcs_default _hb_unicode_funcs_nil
#define _hb_unicode_funcs_default hb_unicode_funcs_get_empty ()
#endif

34
src/hb-unicode.cc
View File

@ -99,23 +99,11 @@ hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
}
hb_unicode_funcs_t _hb_unicode_funcs_nil = {
HB_OBJECT_HEADER_STATIC,
NULL, /* parent */
TRUE, /* immutable */
{
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
}
};
hb_unicode_funcs_t *
hb_unicode_funcs_get_default (void)
{
return &_hb_unicode_funcs_default;
return _hb_unicode_funcs_default;
}
hb_unicode_funcs_t *
@ -124,10 +112,10 @@ hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
hb_unicode_funcs_t *ufuncs;
if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
return &_hb_unicode_funcs_nil;
return hb_unicode_funcs_get_empty ();
if (!parent)
parent = &_hb_unicode_funcs_nil;
parent = hb_unicode_funcs_get_empty ();
hb_unicode_funcs_make_immutable (parent);
ufuncs->parent = hb_unicode_funcs_reference (parent);
@ -145,7 +133,19 @@ hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
hb_unicode_funcs_t *
hb_unicode_funcs_get_empty (void)
{
return &_hb_unicode_funcs_nil;
static const hb_unicode_funcs_t _hb_unicode_funcs_nil = {
HB_OBJECT_HEADER_STATIC,
NULL, /* parent */
TRUE, /* immutable */
{
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
}
};
return const_cast<hb_unicode_funcs_t *> (&_hb_unicode_funcs_nil);
}
hb_unicode_funcs_t *
@ -205,7 +205,7 @@ hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
hb_unicode_funcs_t *
hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
{
return ufuncs->parent ? ufuncs->parent : &_hb_unicode_funcs_nil;
return ufuncs->parent ? ufuncs->parent : hb_unicode_funcs_get_empty ();
}