Added prototype OpenType Layout support
sources. This is not a port of the OTL extension of FT 1.x, as it uses a very different design. These sources are placed here for comments and peer-review
This commit is contained in:
David Turner
parent
dbe4872bf0
commit
18789bfe9f
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#include <oltypes.h>
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LOCAL_FUNC
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TT_Error OTL_Table_Init( OTL_Table* table,
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FT_Memory memory )
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{
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MEM_Set( table, 0, sizeof(*table) );
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table->memory = memory;
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}
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/* read a script list table */
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/* use with any table */
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LOCAL_FUNC
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TT_Error OTL_Table_Set_Scripts( OTL_Table* table,
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TT_Byte* bytes,
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TT_Long len,
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OTL_Type otl_type )
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{
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TT_Byte* p;
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TT_Byte* start = bytes;
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TT_UInt count, max_langs;
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TT_Error error;
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/* skip version of the JSTF table */
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if (otl_type == otl_jstf)
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start += 4;
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p = start;
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/* we must allocate the script_tags and language_tags arrays */
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/* this requires that we compute the maximum number of languages */
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/* per script.. */
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count = table->num_scripts = OTL_UShort(p);
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max_langs = 0;
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for ( ; count > 0; count++ )
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{
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TT_Byte* script;
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TT_UInt num_langs;
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p += 4; /* skip tag */
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script = bytes + OTL_UShort(p);
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/* skip the baseValues or extenders field of the BASE and JSTF table */
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if (otl_type == otl_type_base || otl_type == otl_type_jstf)
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script += 2;
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/* test if there is a default language system */
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if ( OTL_UShort(script) )
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num_langs++;
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/* test other language systems */
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num_langs += OTL_UShort(script); /* add other lang sys */
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if (num_langs > max_langs)
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max_langs = num_langs;
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}
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/* good, now allocate the tag arrays */
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if ( !ALLOC_ARRAY( table->script_tags,
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table->num_scripts + max_langs,
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TT_ULong ) )
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{
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table->language_tags = table->script_tags + table->num_scripts;
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table->max_languages = max_langs;
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table->num_languages = 0;
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table->otl_type = otl_type;
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table->scripts_table = bytes;
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table->scripts_len = len;
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/* fill the script_tags array */
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{
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TT_UInt n;
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TT_Byte* p = start + 2; /* skip count */
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for ( n = 0; n < table->num_scripts; n++ )
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{
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table->script_tags[n] = OTL_ULong(p);
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p += 2; /* skip offset */
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}
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}
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}
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return error;
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}
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/* add a features list to the table */
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/* use only with a GSUB or GPOS table */
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LOCAL_FUNC
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TT_Error OTL_Table_Set_Features( OTL_Table* table,
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TT_Byte* bytes,
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TT_Long len )
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{
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TT_Error error;
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TT_Byte* p = bytes;
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TT_UInt count;
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table->max_features = count = OTL_UShort(p);
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if ( !ALLOC_ARRAY( table->feature_tags, count, TT_ULong ) &&
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!ALLOC_ARRAY( table->features, count, TT_Bool ) )
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{
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table->features_table = bytes;
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table->features_len = len;
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}
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return error;
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}
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/* add a lookup list to the table */
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/* use only with a GSUB or GPOS table */
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LOCAL_FUNC
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TT_Error OTL_Table_Set_Lookups( OTL_Table* table,
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TT_Byte* bytes,
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TT_Long len )
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{
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TT_Error error;
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TT_Byte* p = bytes;
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TT_UInt count;
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table->max_lookups = count = OTL_UShort(p);
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if ( !ALLOC_ARRAY( table->lookups, count, TT_Bool ) )
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{
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table->lookups_table = bytes;
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table->lookups_len = len;
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}
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return error;
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}
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/* discard table arrays */
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LOCAL_FUNC
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void OTL_Table_Done( OTL_Table* table )
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{
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FREE( table->scrip_tags );
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FREE( table->language_tags );
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FREE( table->feature_tags );
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FREE( table->lookups );
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}
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/* return the list of available languages for a given script */
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/* use with any table.. */
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LOCAL_FUNC
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void OTL_Get_Languages_List( OTL_Table* table,
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TT_ULong script_tag )
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{
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TT_UInt n;
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TT_Byte* p;
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TT_Byte* script = 0;
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TT_Byte* start = table->scripts_table;
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if ( table->otl_type == otl_type_jstf ) /* skip version for JSTF */
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start += 4;
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p = start + 6; /* skip count+first tag */
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for ( n = 0; n < table->num_scripts; n++, p += 6 )
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{
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if ( table->script_tags[n] == script_tag )
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{
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script = table->scripts_table + OTL_UShort(p);
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break;
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}
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}
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table->cur_script = script;
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if (!script)
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table->num_languages = 0;
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else
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{
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/* now fill the language_tags array with the appropriate values */
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/* not that we put a '0' tag in front of the list to indicate that */
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/* there is a default language for this script.. */
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TT_ULong* tags = table->language_tags;
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switch (table->otl_type)
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{
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case otl_type_base:
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case otl_type_jstf:
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script += 2; /* skip basevalue or extenders */
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/* fall-through */
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default:
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if ( OTL_UShort(script) )
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*tags++ = 0;
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}
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count = OTL_UShort(script);
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for ( ; count > 0; count-- )
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{
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*tags++ = OTL_ULong(script);
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script += 2; /* skip offset */
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}
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table->num_langs = tags - table->language_tags;
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}
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}
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/* return the list of available features for the current script/language */
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/* use with a GPOS or GSUB script table */
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LOCAL_FUNC
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void OTL_Get_Features_List( OTL_Table* table,
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TT_ULong language_tag )
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{
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TT_UInt n;
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TT_Byte* script = table->cur_script;
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TT_Byte* language = 0;
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TT_UShort offset;
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/* clear feature selection table */
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for ( n = 0; n < table->max_features; n++ )
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table->features[n] = 0;
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/* now, look for the current language */
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if ( language_tag == 0 )
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{
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offset = OTL_UShort(script);
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if (!offset) return; /* if there is no default language, exit */
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language = script - 2 + offset;
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}
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else
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{
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TT_Byte* p = script + 8; /* skip default+count+1st tag */
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TT_UShort index;
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for ( n = 0; n < table->num_languages; n++, p+=6 )
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{
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if ( table->language_tags[n] == language_tag )
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{
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language = script + OTL_UShort(p);
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break;
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}
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}
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table->cur_language = language;
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if (!language) return;
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p = language + 2; /* skip lookup order */
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index = OTL_UShort(p); /* required feature index */
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if (index != 0xFFFF)
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{
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if (index < table->max_features)
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table->features[index] = 1;
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}
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count = OTL_UShort(p);
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for ( ; count > 0; count-- )
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{
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index = OTL_UShort(p);
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if (index < table->max_features)
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table->features[index] = 1;
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}
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}
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}
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/* return the list of lookups for the current features list */
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/* use only with a GSUB or GPOS table */
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LOCAL_FUNC
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void OTL_Get_Lookups_List( OTL_Table* table )
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{
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TT_UInt n;
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TT_Byte* features = table->features_table;
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TT_Byte* p = features + 6; /* skip count+1st tag */
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/* clear lookup list */
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for ( n = 0; n < table->max_lookups; n++ )
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table->lookups[n] = 0;
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/* now, parse the features list */
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for ( n = 0; n < table->features; n++ )
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{
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if (table->features[n])
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{
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TT_UInt count;
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TT_UShort index;
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TT_Byte* feature;
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feature = features + OTL_UShort(p);
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p += 4; /* skip tag */
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/* now, select all lookups from this feature */
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count = OTL_UShort(feature);
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for ( ; count > 0; count-- )
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{
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index = OTL_UShort(feature);
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if (index < table->max_lookups)
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table->lookups[index] = 1;
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}
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}
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}
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}
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/* find the basevalues and minmax for the current script/language */
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/* only use it with a BASE table.. */
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LOCAL_FUNC
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void OTL_Get_Baseline_Values( OTL_Table* table,
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TT_ULong language_tag )
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{
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TT_Byte* script = table->cur_script;
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TT_Byte* p = script;
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TT_UShort offset, count;
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table->cur_basevalues = 0;
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table->cur_minmax = 0;
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/* read basevalues */
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offset = OTL_UShort(p);
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if (offset)
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table->cur_basevalues = script + offset;
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offset = OTL_UShort(p);
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if (offset)
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table->cur_minmax = script + offset;
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count = OTL_UShort(p);
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for ( ; count > 0; count-- )
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{
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TT_ULong tag;
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tag = OTL_ULong(p);
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if ( language_tag == tag )
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{
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table->cur_minmax = script + OTL_UShort(p);
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break;
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}
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p += 2; /* skip offset */
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}
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}
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/* compute the coverage value of a given glyph id */
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LOCAL_FUNC
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TT_Long OTL_Get_Coverage_Index( TT_Byte* coverage,
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TT_UInt glyph_id )
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{
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TT_Long result = -1;
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TT_UInt count, index, start, end;
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TT_Byte* p = coverage;
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switch ( OTL_UShort(p) )
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{
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case 1: /* coverage format 1 - array of glyph indices */
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{
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count = OTL_UShort(p);
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for ( index = 0; index < count; index++ )
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{
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if ( OTL_UShort(p) == glyph_id )
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{
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result = index;
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break;
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}
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}
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}
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break;
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case 2:
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{
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count = OTL_UShort(p);
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for ( ; count > 0; count-- )
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{
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start = OTL_UShort(p);
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end = OTL_UShort(p);
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index = OTL_UShort(p);
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if (start <= glyph_id && glyph_id <= end)
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{
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result = glyph_id - start + index;
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break;
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}
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}
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}
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break;
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}
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return result;
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}
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/* compute the class value of a given glyph_id */
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LOCAL_FUNC
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TT_UInt OTL_Get_Glyph_Class( TT_Byte* class_def,
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TT_UInt glyph_id )
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{
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TT_Byte* p = class_def;
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TT_UInt result = 0;
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TT_UInt start, end, count, index;
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switch ( OTL_UShort(p) )
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{
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case 1:
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{
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start = OTL_UShort(p);
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count = OTL_UShort(p);
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glyph_id -= start;
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if (glyph_id < count)
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{
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p += 2*glyph_id;
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result = OTL_UShort(p);
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}
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}
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break;
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case 2:
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{
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count = OTL_UShort(p);
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for ( ; count > 0; count-- )
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{
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start = OTL_UShort(p);
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end = OTL_UShort(p);
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index = OTL_UShort(p);
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if ( start <= glyph_id && glyph_id <= end )
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{
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result = index;
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break;
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}
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}
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}
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break;
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}
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return result;
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}
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/* compute the adjustement necessary for a given device size */
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LOCAL_FUNC
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TT_Int OTL_Get_Device_Adjustment( TT_Byte* device,
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TT_UInt size )
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{
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TT_Byte* p = device;
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TT_Int result = 0;
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TT_UInt start, end;
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TT_Short value;
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start = OTL_UShort(p);
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end = OTL_UShort(p);
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if (size >= start && size <= end)
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{
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/* I know we could do all of this without a switch, with */
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/* clever shifts and everything, but it makes the code */
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/* really difficult to understand.. */
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size -= start;
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switch ( OTL_UShort(p) )
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{
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case 1: /* 2-bits per value */
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{
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p += 2*(size >> 3);
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size = (size & 7) << 1;
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value = (TT_Short)((TT_Short)OTL_UShort(p) << size);
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result = value >> 14;
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}
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break;
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case 2: /* 4-bits per value */
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{
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p += 2*(size >> 2);
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size = (size & 3) << 2;
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value = (TT_Short)((TT_Short)OTL_UShort(p) << size);
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result = value >> 12;
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}
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break;
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case 3: /* 8-bits per value */
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{
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p += 2*(size >> 1);
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size = (size & 1) << 3;
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value = (TT_Short)((TT_Short)OTL_UShort(p) << size);
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result = value >> 8;
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}
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break;
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}
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}
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return result;
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}
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/* compute a BaseCoord value */
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LOCAL_FUNC
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TT_Int OTL_Get_Base_Coordinate( TT_Byte* base_coord,
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TT_UShort *format
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TT_UShort *ref_glyph_id,
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TT_Byte* *device )
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{
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TT_Byte* p =base_coord;
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TT_Int result = 0;
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*format = OTL_UShort(p);
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switch (*format)
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{
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case
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}
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}
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@ -0,0 +1,238 @@
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#ifndef OLTYPES_H
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#define OLTYPES_H
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#include <ftobjs.h>
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#include <tttypes.h>
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/*************************************************************
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*
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* <Struct> OTL_Table
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*
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* <Description>
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* The base table of most OpenType Layout sub-tables.
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* Provides a simple way to scan a table for script,
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* languages, features and lookups..
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*
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* <Fields>
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* num_scripts :: number of scripts in table's script list
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* script_tags :: array of tags for each table script
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*
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* max_languages :: max number of languages for any script in
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* the table.
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* num_languages :: number of languages available for current script
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* language_tags :: tags of all languages available for current script.
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*
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* max_features :: total number of features in table
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* feature_tags :: tags of all features for current script/language
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*
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* max_lookups :: total number of lookups in table
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* lookups :: selection flags for all lookups for current
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* feature list.
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*
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****************************************************************/
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typedef enum OTL_Type_
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{
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otl_type_none = 0,
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otl_type_base,
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otl_type_gdef,
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otl_type_gpos,
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otl_type_gsub,
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otl_type_jstf
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} OTL_Type;
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|
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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 */
|
||||
Loading…
Reference in New Issue