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Functions
Types and Values
typedef | PangoOTTag |
PangoOTInfo | |
PangoOTBuffer | |
struct | PangoOTGlyph |
PangoOTRuleset | |
struct | PangoOTRulesetDescription |
enum | PangoOTTableType |
struct | PangoOTFeatureMap |
#define | PANGO_OT_ALL_GLYPHS |
#define | PANGO_OT_NO_FEATURE |
#define | PANGO_OT_NO_SCRIPT |
#define | PANGO_OT_DEFAULT_LANGUAGE |
#define | PANGO_OT_TAG_DEFAULT_LANGUAGE |
#define | PANGO_OT_TAG_DEFAULT_SCRIPT |
Description
Functions and macros in this section are used to implement the OpenType Layout features and algorithms. These are mostly useful when writing Fontconfig-based shaping engines
Functions
PANGO_OT_TAG_MAKE()
#define PANGO_OT_TAG_MAKE(c1,c2,c3,c4) ((PangoOTTag) FT_MAKE_TAG (c1, c2, c3, c4))
Creates a PangoOTTag from four characters. This is similar and
compatible with the
macro from FreeType.FT_MAKE_TAG()
PANGO_OT_TAG_MAKE_FROM_STRING()
#define PANGO_OT_TAG_MAKE_FROM_STRING(s)
Creates a PangoOTTag from a string. The string should be at least
four characters long (pad with space characters if needed), and need
not be nul-terminated. This is a convenience wrapper around
PANGO_OT_TAG_MAKE()
, but cannot be used in certain situations, for
example, as a switch expression, as it dereferences pointers.
pango_ot_info_get ()
PangoOTInfo *
pango_ot_info_get (FT_Face face
);
pango_ot_info_get
is deprecated and should not be used in newly-written code.
Returns the PangoOTInfo structure for the given FreeType font face.
Since: 1.2
pango_ot_info_find_script ()
gboolean pango_ot_info_find_script (PangoOTInfo *info
,PangoOTTableType table_type
,PangoOTTag script_tag
,guint *script_index
);
pango_ot_info_find_script
is deprecated and should not be used in newly-written code.
Finds the index of a script. If not found, tries to find the 'DFLT'
and then 'dflt' scripts and return the index of that in script_index
.
If none of those is found either, PANGO_OT_NO_SCRIPT
is placed in
script_index
.
All other functions taking an input script_index parameter know
how to handle PANGO_OT_NO_SCRIPT
, so one can ignore the return
value of this function completely and proceed, to enjoy the automatic
fallback to the 'DFLT'/'dflt' script.
Parameters
info |
a PangoOTInfo. |
|
table_type |
the table type to obtain information about. |
|
script_tag |
the tag of the script to find. |
|
script_index |
location to store the index of the
script, or |
[out][optional] |
pango_ot_info_find_language ()
gboolean pango_ot_info_find_language (PangoOTInfo *info
,PangoOTTableType table_type
,guint script_index
,PangoOTTag language_tag
,guint *language_index
,guint *required_feature_index
);
pango_ot_info_find_language
is deprecated and should not be used in newly-written code.
Finds the index of a language and its required feature index.
If the language is not found, sets language_index
to
PANGO_OT_DEFAULT_LANGUAGE and the required feature of the default language
system is returned in required_feature_index. For best compatibility with
some fonts, also searches the language system tag 'dflt' before falling
back to the default language system, but that is transparent to the user.
The user can simply ignore the return value of this function to
automatically fall back to the default language system.
Parameters
info |
a PangoOTInfo. |
|
table_type |
the table type to obtain information about. |
|
script_index |
the index of the script whose languages are searched. |
|
language_tag |
the tag of the language to find. |
|
language_index |
location to store the index of
the language, or |
[out][optional] |
required_feature_index |
location to store the
required feature index of the language, or |
[out][optional] |
pango_ot_info_find_feature ()
gboolean pango_ot_info_find_feature (PangoOTInfo *info
,PangoOTTableType table_type
,PangoOTTag feature_tag
,guint script_index
,guint language_index
,guint *feature_index
);
pango_ot_info_find_feature
is deprecated and should not be used in newly-written code.
Finds the index of a feature. If the feature is not found, sets
feature_index
to PANGO_OT_NO_FEATURE, which is safe to pass to
pango_ot_ruleset_add_feature()
and similar functions.
In the future, this may set feature_index
to an special value that if used
in pango_ot_ruleset_add_feature()
will ask Pango to synthesize the
requested feature based on Unicode properties and data. However, this
function will still return FALSE
in those cases. So, users may want to
ignore the return value of this function in certain cases.
Parameters
info |
a PangoOTInfo. |
|
table_type |
the table type to obtain information about. |
|
feature_tag |
the tag of the feature to find. |
|
script_index |
the index of the script. |
|
language_index |
the index of the language whose features are searched,
or |
|
feature_index |
location to store the index of
the feature, or |
[out][optional] |
pango_ot_info_list_scripts ()
PangoOTTag * pango_ot_info_list_scripts (PangoOTInfo *info
,PangoOTTableType table_type
);
pango_ot_info_list_scripts
is deprecated and should not be used in newly-written code.
Obtains the list of available scripts.
pango_ot_info_list_languages ()
PangoOTTag * pango_ot_info_list_languages (PangoOTInfo *info
,PangoOTTableType table_type
,guint script_index
,PangoOTTag language_tag
);
pango_ot_info_list_languages
is deprecated and should not be used in newly-written code.
Obtains the list of available languages for a given script.
Parameters
info |
a PangoOTInfo. |
|
table_type |
the table type to obtain information about. |
|
script_index |
the index of the script to list languages for. |
|
language_tag |
unused parameter. |
pango_ot_info_list_features ()
PangoOTTag * pango_ot_info_list_features (PangoOTInfo *info
,PangoOTTableType table_type
,PangoOTTag tag
,guint script_index
,guint language_index
);
pango_ot_info_list_features
is deprecated and should not be used in newly-written code.
Obtains the list of features for the given language of the given script.
Parameters
info |
a PangoOTInfo. |
|
table_type |
the table type to obtain information about. |
|
tag |
unused parameter. |
|
script_index |
the index of the script to obtain information about. |
|
language_index |
the index of the language to list features for, or
|
pango_ot_buffer_new ()
PangoOTBuffer *
pango_ot_buffer_new (PangoFcFont *font
);
pango_ot_buffer_new
is deprecated and should not be used in newly-written code.
Creates a new PangoOTBuffer for the given OpenType font.
Since: 1.4
pango_ot_buffer_destroy ()
void
pango_ot_buffer_destroy (PangoOTBuffer *buffer
);
pango_ot_buffer_destroy
is deprecated and should not be used in newly-written code.
Destroys a PangoOTBuffer and free all associated memory.
Since: 1.4
pango_ot_buffer_clear ()
void
pango_ot_buffer_clear (PangoOTBuffer *buffer
);
pango_ot_buffer_clear
is deprecated and should not be used in newly-written code.
Empties a PangoOTBuffer, make it ready to add glyphs to.
Since: 1.4
pango_ot_buffer_add_glyph ()
void pango_ot_buffer_add_glyph (PangoOTBuffer *buffer
,guint glyph
,guint properties
,guint cluster
);
pango_ot_buffer_add_glyph
is deprecated and should not be used in newly-written code.
Appends a glyph to a PangoOTBuffer, with properties
identifying which
features should be applied on this glyph. See pango_ot_ruleset_add_feature()
.
Parameters
buffer |
||
glyph |
the glyph index to add, like a PangoGlyph |
|
properties |
the glyph properties |
|
cluster |
the cluster that this glyph belongs to |
Since: 1.4
pango_ot_buffer_set_rtl ()
void pango_ot_buffer_set_rtl (PangoOTBuffer *buffer
,gboolean rtl
);
pango_ot_buffer_set_rtl
is deprecated and should not be used in newly-written code.
Sets whether glyphs will be rendered right-to-left. This setting is needed for proper horizontal positioning of right-to-left scripts.
Since: 1.4
pango_ot_buffer_set_zero_width_marks ()
void pango_ot_buffer_set_zero_width_marks (PangoOTBuffer *buffer
,gboolean zero_width_marks
);
pango_ot_buffer_set_zero_width_marks
is deprecated and should not be used in newly-written code.
Sets whether characters with a mark class should be forced to zero width. This setting is needed for proper positioning of Arabic accents, but will produce incorrect results with standard OpenType Indic fonts.
Parameters
buffer |
||
zero_width_marks |
|
Since: 1.6
pango_ot_buffer_get_glyphs ()
void pango_ot_buffer_get_glyphs (const PangoOTBuffer *buffer
,PangoOTGlyph **glyphs
,int *n_glyphs
);
pango_ot_buffer_get_glyphs
is deprecated and should not be used in newly-written code.
Gets the glyph array contained in a PangoOTBuffer. The glyphs are owned by the buffer and should not be freed, and are only valid as long as buffer is not modified.
Parameters
buffer |
||
glyphs |
location to
store the array of glyphs, or |
[array length=n_glyphs][out][optional] |
n_glyphs |
location to store the number of
glyphs, or |
[out][optional] |
Since: 1.4
pango_ot_buffer_output ()
void pango_ot_buffer_output (const PangoOTBuffer *buffer
,PangoGlyphString *glyphs
);
pango_ot_buffer_output
is deprecated and should not be used in newly-written code.
Exports the glyphs in a PangoOTBuffer into a PangoGlyphString. This is typically used after the OpenType layout processing is over, to convert the resulting glyphs into a generic Pango glyph string.
Since: 1.4
pango_ot_ruleset_get_for_description ()
const PangoOTRuleset * pango_ot_ruleset_get_for_description (PangoOTInfo *info
,const PangoOTRulesetDescription *desc
);
pango_ot_ruleset_get_for_description
is deprecated and should not be used in newly-written code.
Returns a ruleset for the given OpenType info and ruleset
description. Rulesets are created on demand using
pango_ot_ruleset_new_from_description()
.
The returned ruleset should not be modified or destroyed.
The static feature map members of desc
should be alive as
long as info
is.
Since: 1.18
pango_ot_ruleset_new ()
PangoOTRuleset *
pango_ot_ruleset_new (PangoOTInfo *info
);
pango_ot_ruleset_new
is deprecated and should not be used in newly-written code.
Creates a new PangoOTRuleset for the given OpenType info.
pango_ot_ruleset_new_for ()
PangoOTRuleset * pango_ot_ruleset_new_for (PangoOTInfo *info
,PangoScript script
,PangoLanguage *language
);
pango_ot_ruleset_new_for
is deprecated and should not be used in newly-written code.
Creates a new PangoOTRuleset for the given OpenType info, script, and language.
This function is part of a convenience scheme that highly simplifies using a PangoOTRuleset to represent features for a specific pair of script and language. So one can use this function passing in the script and language of interest, and later try to add features to the ruleset by just specifying the feature name or tag, without having to deal with finding script, language, or feature indices manually.
In excess to what pango_ot_ruleset_new()
does, this function will:
-
Find the PangoOTTag script and language tags associated with
script
andlanguage
usingpango_ot_tag_from_script()
andpango_ot_tag_from_language()
, -
For each of table types
PANGO_OT_TABLE_GSUB
andPANGO_OT_TABLE_GPOS
, find the script index of the script tag found and the language system index of the language tag found in that script system, usingpango_ot_info_find_script()
andpango_ot_info_find_language()
, -
For found language-systems, if they have required feature
index, add that feature to the ruleset using
pango_ot_ruleset_add_feature()
, -
Remember found script and language indices for both table types,
and use them in future
pango_ot_ruleset_maybe_add_feature()
andpango_ot_ruleset_maybe_add_features()
.
Because of the way return values of pango_ot_info_find_script()
and
pango_ot_info_find_language()
are ignored, this function automatically
finds and uses the 'DFLT' script and the default language-system.
Since: 1.18
pango_ot_ruleset_new_from_description ()
PangoOTRuleset * pango_ot_ruleset_new_from_description (PangoOTInfo *info
,const PangoOTRulesetDescription *desc
);
pango_ot_ruleset_new_from_description
is deprecated and should not be used in newly-written code.
Creates a new PangoOTRuleset for the given OpenType infor and matching the given ruleset description.
This is a convenience function that calls pango_ot_ruleset_new_for()
and
adds the static GSUB/GPOS features to the resulting ruleset, followed by
adding other features to both GSUB and GPOS.
The static feature map members of desc
should be alive as
long as info
is.
Since: 1.18
pango_ot_ruleset_add_feature ()
void pango_ot_ruleset_add_feature (PangoOTRuleset *ruleset
,PangoOTTableType table_type
,guint feature_index
,gulong property_bit
);
pango_ot_ruleset_add_feature
is deprecated and should not be used in newly-written code.
Adds a feature to the ruleset.
Parameters
ruleset |
||
table_type |
the table type to add a feature to. |
|
feature_index |
the index of the feature to add. |
|
property_bit |
the property bit to use for this feature. Used to identify
the glyphs that this feature should be applied to, or
|
pango_ot_ruleset_maybe_add_feature ()
gboolean pango_ot_ruleset_maybe_add_feature (PangoOTRuleset *ruleset
,PangoOTTableType table_type
,PangoOTTag feature_tag
,gulong property_bit
);
pango_ot_ruleset_maybe_add_feature
is deprecated and should not be used in newly-written code.
This is a convenience function that first tries to find the feature
using pango_ot_info_find_feature()
and the ruleset script and language
passed to pango_ot_ruleset_new_for()
,
and if the feature is found, adds it to the ruleset.
If ruleset
was not created using pango_ot_ruleset_new_for()
, this function
does nothing.
Parameters
ruleset |
||
table_type |
the table type to add a feature to. |
|
feature_tag |
the tag of the feature to add. |
|
property_bit |
the property bit to use for this feature. Used to identify
the glyphs that this feature should be applied to, or
|
Since: 1.18
pango_ot_ruleset_maybe_add_features ()
guint pango_ot_ruleset_maybe_add_features (PangoOTRuleset *ruleset
,PangoOTTableType table_type
,const PangoOTFeatureMap *features
,guint n_features
);
pango_ot_ruleset_maybe_add_features
is deprecated and should not be used in newly-written code.
This is a convenience function that
for each feature in the feature map array features
converts the feature name to a PangoOTTag feature tag using PANGO_OT_TAG_MAKE()
and calls pango_ot_ruleset_maybe_add_feature()
on it.
Parameters
ruleset |
||
table_type |
the table type to add features to. |
|
features |
array of feature name and property bits to add. |
|
n_features |
number of feature records in |
Since: 1.18
pango_ot_ruleset_get_feature_count ()
guint pango_ot_ruleset_get_feature_count (const PangoOTRuleset *ruleset
,guint *n_gsub_features
,guint *n_gpos_features
);
pango_ot_ruleset_get_feature_count
is deprecated and should not be used in newly-written code.
Gets the number of GSUB and GPOS features in the ruleset.
Parameters
ruleset |
||
n_gsub_features |
location to store number of
GSUB features, or |
[out][optional] |
n_gpos_features |
location to store number of
GPOS features, or |
[out][optional] |
Since: 1.18
pango_ot_ruleset_substitute ()
void pango_ot_ruleset_substitute (const PangoOTRuleset *ruleset
,PangoOTBuffer *buffer
);
pango_ot_ruleset_substitute
is deprecated and should not be used in newly-written code.
Performs the OpenType GSUB substitution on buffer
using the features
in ruleset
Since: 1.4
pango_ot_ruleset_position ()
void pango_ot_ruleset_position (const PangoOTRuleset *ruleset
,PangoOTBuffer *buffer
);
pango_ot_ruleset_position
is deprecated and should not be used in newly-written code.
Performs the OpenType GPOS positioning on buffer
using the features
in ruleset
Since: 1.4
pango_ot_ruleset_description_copy ()
PangoOTRulesetDescription *
pango_ot_ruleset_description_copy (const PangoOTRulesetDescription *desc
);
pango_ot_ruleset_description_copy
is deprecated and should not be used in newly-written code.
Creates a copy of desc
, which should be freed with
pango_ot_ruleset_description_free()
. Primarily used internally
by pango_ot_ruleset_get_for_description()
to cache rulesets for
ruleset descriptions.
Returns
the newly allocated PangoOTRulesetDescription, which
should be freed with pango_ot_ruleset_description_free()
.
Since: 1.18
pango_ot_ruleset_description_equal ()
gboolean pango_ot_ruleset_description_equal (const PangoOTRulesetDescription *desc1
,const PangoOTRulesetDescription *desc2
);
pango_ot_ruleset_description_equal
is deprecated and should not be used in newly-written code.
Compares two ruleset descriptions for equality.
Two ruleset descriptions are considered equal if the rulesets
they describe are provably identical. This means that their
script, language, and all feature sets should be equal. For static feature
sets, the array addresses are compared directly, while for other
features, the list of features is compared one by one.
(Two ruleset descriptions may result in identical rulesets
being created, but still compare FALSE
.)
Since: 1.18
pango_ot_ruleset_description_free ()
void
pango_ot_ruleset_description_free (PangoOTRulesetDescription *desc
);
pango_ot_ruleset_description_free
is deprecated and should not be used in newly-written code.
Frees a ruleset description allocated by
pango_ot_ruleset_description_copy()
.
Since: 1.18
pango_ot_ruleset_description_hash ()
guint
pango_ot_ruleset_description_hash (const PangoOTRulesetDescription *desc
);
pango_ot_ruleset_description_hash
is deprecated and should not be used in newly-written code.
Computes a hash of a PangoOTRulesetDescription structure suitable
to be used, for example, as an argument to g_hash_table_new()
.
Since: 1.18
pango_ot_tag_from_language ()
PangoOTTag
pango_ot_tag_from_language (PangoLanguage *language
);
pango_ot_tag_from_language
is deprecated and should not be used in newly-written code.
Finds the OpenType language-system tag best describing language
.
Returns
PangoOTTag best matching language
or
PANGO_OT_TAG_DEFAULT_LANGUAGE
if none found or if language
is NULL
.
Since: 1.18
pango_ot_tag_from_script ()
PangoOTTag
pango_ot_tag_from_script (PangoScript script
);
pango_ot_tag_from_script
is deprecated and should not be used in newly-written code.
Finds the OpenType script tag corresponding to script
.
The PANGO_SCRIPT_COMMON
, PANGO_SCRIPT_INHERITED
, and
PANGO_SCRIPT_UNKNOWN
scripts are mapped to the OpenType
'DFLT' script tag that is also defined as
PANGO_OT_TAG_DEFAULT_SCRIPT
.
Note that multiple PangoScript values may map to the same
OpenType script tag. In particular, PANGO_SCRIPT_HIRAGANA
and PANGO_SCRIPT_KATAKANA
both map to the OT tag 'kana'.
Since: 1.18
pango_ot_tag_to_language ()
PangoLanguage *
pango_ot_tag_to_language (PangoOTTag language_tag
);
pango_ot_tag_to_language
is deprecated and should not be used in newly-written code.
Finds a PangoLanguage corresponding to language_tag
.
Returns
PangoLanguage best matching language_tag
or
PangoLanguage corresponding to the string "xx" if none found.
Since: 1.18
pango_ot_tag_to_script ()
PangoScript
pango_ot_tag_to_script (PangoOTTag script_tag
);
pango_ot_tag_to_script
is deprecated and should not be used in newly-written code.
Finds the PangoScript corresponding to script_tag
.
The 'DFLT' script tag is mapped to PANGO_SCRIPT_COMMON
.
Note that an OpenType script tag may correspond to multiple
PangoScript values. In such cases, the PangoScript value
with the smallest value is returned.
In particular, PANGO_SCRIPT_HIRAGANA
and PANGO_SCRIPT_KATAKANA
both map to the OT tag 'kana'.
This function will return PANGO_SCRIPT_HIRAGANA
for
'kana'.
Since: 1.18
Types and Values
PangoOTTag
typedef guint32 PangoOTTag;
The PangoOTTag typedef is used to represent TrueType and OpenType
four letter tags inside Pango. Use PANGO_OT_TAG_MAKE()
or PANGO_OT_TAG_MAKE_FROM_STRING()
macros to create PangoOTTags manually.
PangoOTInfo
typedef struct _PangoOTInfo PangoOTInfo;
The PangoOTInfo struct contains the various
tables associated with an OpenType font. It contains only private fields and
should only be accessed via the pango_ot_info_*
functions
which are documented below. To obtain a PangoOTInfo,
use pango_ot_info_get()
.
PangoOTBuffer
typedef struct _PangoOTBuffer PangoOTBuffer;
The PangoOTBuffer structure is used to store strings of glyphs associated
with a PangoFcFont, suitable for OpenType layout processing. It contains
only private fields and should only be accessed via the
pango_ot_buffer_*
functions which are documented below.
To obtain a PangoOTBuffer, use pango_ot_buffer_new()
.
struct PangoOTGlyph
struct PangoOTGlyph { guint32 glyph; guint properties; guint cluster; gushort component; gushort ligID; guint internal; };
The PangoOTGlyph structure represents a single glyph together with information used for OpenType layout processing of the glyph. It contains the following fields.
Members
the glyph itself. |
||
the properties value, identifying which features should be
applied on this glyph. See |
||
the cluster that this glyph belongs to. |
||
a component value, set by the OpenType layout engine. |
||
a ligature index value, set by the OpenType layout engine. |
||
for Pango internal use |
PangoOTRuleset
typedef struct _PangoOTRuleset PangoOTRuleset;
The PangoOTRuleset structure holds a
set of features selected from the tables in an OpenType font.
(A feature is an operation such as adjusting glyph positioning
that should be applied to a text feature such as a certain
type of accent.) A PangoOTRuleset
is created with pango_ot_ruleset_new()
, features are added
to it with pango_ot_ruleset_add_feature()
, then it is
applied to a PangoGlyphString with pango_ot_ruleset_shape()
.
struct PangoOTRulesetDescription
struct PangoOTRulesetDescription { PangoScript script; PangoLanguage *language; const PangoOTFeatureMap *static_gsub_features; guint n_static_gsub_features; const PangoOTFeatureMap *static_gpos_features; guint n_static_gpos_features; const PangoOTFeatureMap *other_features; guint n_other_features; };
The PangoOTRuleset structure holds all the information needed
to build a complete PangoOTRuleset from an OpenType font.
The main use of this struct is to act as the key for a per-font
hash of rulesets. The user populates a ruleset description and
gets the ruleset using pango_ot_ruleset_get_for_description()
or create a new one using pango_ot_ruleset_new_from_description()
.
Members
PangoScript |
a PangoScript. |
|
PangoLanguage * |
||
const PangoOTFeatureMap * |
static map of GSUB features,
or |
[nullable] |
length of |
||
const PangoOTFeatureMap * |
static map of GPOS features,
or |
[nullable] |
length of |
||
const PangoOTFeatureMap * |
map of extra features to add to both
GSUB and GPOS, or |
[nullable] |
length of |
Since: 1.18
enum PangoOTTableType
The PangoOTTableType enumeration values are used to
identify the various OpenType tables in the
pango_ot_info_*
functions.
struct PangoOTFeatureMap
struct PangoOTFeatureMap { char feature_name[5]; gulong property_bit; };
The PangoOTFeatureMap typedef is used to represent an OpenType feature with the property bit associated with it. The feature tag is represented as a char array instead of a PangoOTTag for convenience.
Members
feature tag in represented as four-letter ASCII string. |
||
the property bit to use for this feature. See
|
Since: 1.18
PANGO_OT_ALL_GLYPHS
#define PANGO_OT_ALL_GLYPHS ((guint) 0xFFFF)
This is used as the property bit in pango_ot_ruleset_add_feature()
when a
feature should be applied to all glyphs.
Since: 1.16
PANGO_OT_NO_FEATURE
#define PANGO_OT_NO_FEATURE ((guint) 0xFFFF)
This is used as a feature index that represent no feature, that is, should be
skipped. It may be returned as feature index by pango_ot_info_find_feature()
if the feature is not found, and pango_ot_ruleset_add_feature()
function
automatically skips this value, so no special handling is required by the user.
Since: 1.18
PANGO_OT_NO_SCRIPT
#define PANGO_OT_NO_SCRIPT ((guint) 0xFFFF)
This is used as a script index that represent no script, that is, when the
requested script was not found, and a default ('DFLT') script was not found
either. It may be returned as script index by pango_ot_info_find_script()
if the script or a default script are not found, all other functions
taking a script index essentially return if the input script index is
this value, so no special handling is required by the user.
Since: 1.18
PANGO_OT_DEFAULT_LANGUAGE
#define PANGO_OT_DEFAULT_LANGUAGE ((guint) 0xFFFF)
This is used as the language index in pango_ot_info_find_feature()
when
the default language system of the script is desired.
It is also returned by pango_ot_info_find_language()
if the requested language
is not found, or the requested language tag was PANGO_OT_TAG_DEFAULT_LANGUAGE.
The end result is that one can always call pango_ot_tag_from_language()
followed by pango_ot_info_find_language()
and pass the result to
pango_ot_info_find_feature()
without having to worry about falling back to
default language system explicitly.
Since: 1.16
PANGO_OT_TAG_DEFAULT_LANGUAGE
#define PANGO_OT_TAG_DEFAULT_LANGUAGE PANGO_OT_TAG_MAKE ('d', 'f', 'l', 't')
This is a PangoOTTag representing a special language tag 'dflt'. It is
returned as language tag by pango_ot_tag_from_language()
if the requested
language is not found. It is safe to pass this value to
pango_ot_info_find_language()
as that function falls back to returning default
language-system if the requested language tag is not found.
Since: 1.18
PANGO_OT_TAG_DEFAULT_SCRIPT
#define PANGO_OT_TAG_DEFAULT_SCRIPT PANGO_OT_TAG_MAKE ('D', 'F', 'L', 'T')
This is a PangoOTTag representing the special script tag 'DFLT'. It is
returned as script tag by pango_ot_tag_from_script()
if the requested script
is not found.
Since: 1.18