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kc3-lang/freetype/src/otlayout/oltypes.h
David Turner
- 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 * features :: selection flags for all features in current script/lang * * 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; typedef struct OTL_BaseCoord_ { TT_UShort format; TT_Short coordinate; TT_UShort ref_glyph; TT_UShort ref_point; TT_Byte* device; } OTL_BaseCoord; typedef struct OTL_ValueRecord_ { TT_Vector placement; TT_Vector advance; TT_Byte* device_pla_x; TT_Byte* device_pla_y; TT_Byte* device_adv_x; TT_Byte* device_adv_y; } OTL_ValueRecord; typedef struct OTL_Anchor_ { TT_UInt format; TT_Vector coord; TT_UInt anchor_point; TT_Byte* device_x; TT_Byte* device_y; } OTL_Anchor; 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 ); LOCAL_DEF TT_UInt OTL_Get_Glyph_Class( TT_Byte* class_def, TT_UInt glyph_id ); LOCAL_DEF TT_Int OTL_Get_Device_Adjustment( TT_Byte* device, TT_UInt size ); LOCAL_DEF void OTL_Get_Base_Coordinate( TT_Byte* base_coord, OTL_BaseCoord* coord ); LOCAL_DEF TT_Int OTL_ValueRecord_Size( TT_UShort value_format ); LOCAL_DEF void OTL_Get_ValueRecord( TT_Byte* value_record, TT_UShort value_format, TT_Byte* pos_table, OTL_ValueRecord* record ); LOCAL_DEF void OTL_Get_Anchor( TT_Byte* anchor_table, OTL_Anchor* anchor ); LOCAL_DEF void OTL_Get_Mark( TT_Byte* mark_array, TT_UInt index, TT_UShort* clazz, OTL_Anchor* anchor ); #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 */