ref: 7bb7fedef169a95ee56ad112fe2be774c0409296
dir: /src/otlayout/oltypes.h/
#ifndef OLTYPES_H
#define OLTYPES_H
#include <ftobjs.h>
#include <tttypes.h>
/*************************************************************
*
* <Struct> OTL_Table
*
* <Description>
* The base table of most OpenType Layout sub-tables.
* Provides a simple way to scan a table for script,
* languages, features and lookups..
*
* <Fields>
* num_scripts :: number of scripts in table's script list
* script_tags :: array of tags for each table script
*
* max_languages :: max number of languages for any script in
* the table.
* num_languages :: number of languages available for current script
* language_tags :: tags of all languages available for current script.
*
* max_features :: total number of features in table
* feature_tags :: tags of all features for current script/language
*
* max_lookups :: total number of lookups in table
* lookups :: selection flags for all lookups for current
* feature list.
*
****************************************************************/
typedef enum OTL_Type_
{
otl_type_none = 0,
otl_type_base,
otl_type_gdef,
otl_type_gpos,
otl_type_gsub,
otl_type_jstf
} OTL_Type;
typedef struct OTL_Table_
{
FT_Memory memory;
TT_Int num_scripts;
TT_Tag* script_tags;
TT_Int max_languages;
TT_Int num_languages;
TT_Tag* language_tags;
TT_Int max_features;
TT_Tag* feature_tags;
TT_Bool* features;
TT_Int max_lookups;
TT_Bool* lookups;
TT_Byte* scripts_table;
TT_Long scripts_len;
TT_Byte* features_table;
TT_Long* features_len;
TT_Byte* lookups_table;
TT_Byte* lookups_len;
TT_Byte* cur_script; /* current script */
TT_Byte* cur_language; /* current language */
TT_Byte* cur_base_values;
TT_Byte* cur_min_max;
OTL_Type otl_type;
} OTL_Table;
LOCAL_DEF
TT_Error OTL_Table_Init( OTL_Table* table,
FT_Memory memory );
LOCAL_DEF
TT_Error OTL_Table_Set_Scripts( OTL_Table* table,
TT_Byte* bytes,
TT_Long len,
OTL_Type otl_type );
LOCAL_DEF
TT_Error OTL_Table_Set_Features( OTL_Table* table,
TT_Byte* bytes,
TT_Long len );
LOCAL_DEF
TT_Error OTL_Table_Set_Lookups( OTL_Table* table,
TT_Byte* bytes,
TT_Long len );
LOCAL_DEF
void OTL_Table_Done( OTL_Table* table );
/*****************************************************
*
* Typical uses:
*
* - after OTL_Table_Set_Scripts have been called :
*
* table->script_tags contains the list of tags of all
* scripts defined for this table.
*
* table->num_scripts is the number of scripts
*
*/
/********************************************************
*
* - after calling OTL_Table_Set_Features:
*
* table->max_features is the number of all features
* in the table
*
* table->feature_tags is the list of tags of all
* features in the table
*
* table->features[] is an array of boolean used to
* indicate which feature is active for a given script/language
* it is empty (zero-filled) by default.
*
*/
/*******************************************************************
*
* - after calling OTL_Get_Languages_List(script_tag):
*
* table->num_languages is the number of language systems
* available for the script, including the default
* langsys if there is one
*
* table->language_tags contains the list of tags of all
* languages for the script. Note that the default langsys
* has tag "0" and is always placed first in "language_tags".
*
*
*
*/
LOCAL_DEF
void OTL_Get_Languages_List( OTL_Table* table,
TT_ULong script_tag );
/*******************************************************************
*
* - after calling OTL_Get_Features_List(language_tag):
*
* table->features[] is an array of booleans used to indicate
* which features are active for the current script/language
*
* note that this function must be called after OTL_Get_Languages
* which remembers the last "script_tag" used..
*
* A client application can change the table->features[] array
* to add or remove features from the list.
*
*
*
*/
LOCAL_DEF
void OTL_Get_Features_List( OTL_Table* table,
TT_ULong language_tag );
LOCAL_DEF
void OTL_Get_Baseline_Values( OTL_Table* table,
TT_ULong language_tag );
LOCAL_DEF
void OTL_Get_Justification( OTL_Table* table,
TT_ULong language_tag );
/*******************************************************************
*
* - after calling OTL_Get_Lookups_List():
*
* The function uses the table->features[] array of boolean
* to determine which lookups must be processed.
*
* It fills the table->lookups[] array accordingly. It is also
* an array of booleans (one for each lookup).
*
*
*/
LOCAL_DEF
void OTL_Get_Lookups_List( OTL_Table* table );
/***************************************************************
*
* So the whole thing looks like:
*
*
* 1. A client specifies a given script and requests available
* language through OTL_Get_Languages_List()
*
* 2. It selects the language tag it needs, then calls
* OTL_Get_Features_List()
*
* 3. It updates the list of active features if it needs to
*
* 4. It calls OTL_Get_Lookups_List()
* It now has a list of active lookups in "table->lookups[]"
*
* 5. The lookups are processed according to the table's type..
*
*/
LOCAL_DEF
TT_Long OTL_Get_Coverage_Index( TT_Byte* coverage,
TT_UInt glyph_id );
#define OTL_Byte(p) (p++, p[-1])
#define OTL_UShort(p) (p+=2, ((TT_UShort)p[-2] << 8) | p[-1])
#define OTL_ULong(p) (p+=4, ((TT_ULong)p[-4] << 24) | \
((TT_ULong)p[-3] << 16) | \
((TT_ULong)p[-2] << 8 ) | p[-1] )
#endif /* OLTYPES_H */