2023-06-04 21:31:13 +02:00
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#include "afadjust.h"
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#include <freetype/freetype.h>
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftmemory.h>
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2023-06-26 05:24:02 +02:00
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#include <freetype/internal/ftdebug.h>
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2023-06-04 21:31:13 +02:00
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2023-06-26 05:43:23 +02:00
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#define AF_ADJUSTMENT_DATABASE_LENGTH ( sizeof(adjustment_database)/sizeof(adjustment_database[0]) )
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#undef FT_COMPONENT
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#define FT_COMPONENT afadjust
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/*TODO: find out whether capital u/U with accent entries are needed*/
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/*the accent won't merge with the rest of the glyph because the accent mark is sitting above empty space*/
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FT_LOCAL_ARRAY_DEF( AF_AdjustmentDatabaseEntry )
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adjustment_database[] =
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{
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{0x21, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /* ! */
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{0x69, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /* i */
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{0x6A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /* j */
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{0xA1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*Inverted Exclamation Mark*/
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{0xBF, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*Inverted Question Mark*/
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{0xC0, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*A with grave*/
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{0xC1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*A with acute*/
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{0xC2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*A with circumflex*/
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{0xC3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*A with tilde*/
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{0xC8, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*E with grave*/
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{0xCC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*I with grave*/
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{0xD9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*U with grave*/
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{0xE0, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*a with grave*/
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{0xEC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*i with grave*/
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{0x114, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*E with macron*/
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{0x12A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*I with macron*/
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{0x12B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*i with macron*/
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{0x16A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP}, /*U with macron*/
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{0x16B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP} /*u with macron*/
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};
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/*Helper function: get the adjustment database entry for a codepoint*/
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FT_LOCAL_DEF( const AF_AdjustmentDatabaseEntry* )
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af_adjustment_database_lookup( FT_UInt32 codepoint ) {
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/* Binary search for database entry */
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FT_Int low = 0;
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FT_Int high = AF_ADJUSTMENT_DATABASE_LENGTH - 1;
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while ( high > low )
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{
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FT_Int mid = ( low + high ) / 2;
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FT_UInt32 mid_codepoint = adjustment_database[mid].codepoint;
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if ( mid_codepoint < codepoint )
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{
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low = mid + 1;
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}
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else if ( mid_codepoint > codepoint )
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{
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high = mid - 1;
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}
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else
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{
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return &adjustment_database[mid];
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}
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}
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return NULL;
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}
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FT_LOCAL_DEF( AF_VerticalSeparationAdjustmentType )
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af_lookup_vertical_seperation_type( AF_ReverseCharacterMap map, FT_Int glyph_index ) {
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FT_UInt32 codepoint = af_reverse_character_map_lookup( map, glyph_index );
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const AF_AdjustmentDatabaseEntry *entry = af_adjustment_database_lookup( codepoint );
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if ( entry == NULL )
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{
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return AF_VERTICAL_ADJUSTMENT_NONE;
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}
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return entry->vertical_separation_adjustment_type;
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}
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typedef struct AF_ReverseMapEntry_
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{
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FT_Int glyph_index;
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FT_UInt32 codepoint;
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} AF_ReverseMapEntry;
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typedef struct AF_ReverseCharacterMap_
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{
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FT_UInt length;
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AF_ReverseMapEntry *entries;
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} AF_ReverseCharacterMap_Rec;
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FT_LOCAL_DEF( FT_UInt32 )
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af_reverse_character_map_lookup( AF_ReverseCharacterMap map, FT_Int glyph_index )
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{
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if ( map == NULL )
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{
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return 0;
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}
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/* Binary search for reverse character map entry */
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FT_Int low = 0;
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FT_Int high = map->length - 1;
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while ( high > low )
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{
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FT_Int mid = ( high + low ) / 2;
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FT_Int mid_glyph_index = map->entries[mid].glyph_index;
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if ( glyph_index < mid_glyph_index )
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{
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high = mid - 1;
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}
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else if ( glyph_index > mid_glyph_index )
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{
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low = mid + 1;
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}
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else
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{
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return map->entries[mid].codepoint;
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}
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}
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return 0;
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}
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FT_LOCAL_DEF( FT_Error )
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af_reverse_character_map_new( FT_Face face, AF_ReverseCharacterMap *map, FT_Memory memory )
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{
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/* Search for a unicode charmap */
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/* If there isn't one, create a blank map */
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/*TODO: use GSUB lookups */
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FT_TRACE4(( "af_reverse_character_map_new: building reverse character map\n" ));
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2023-06-29 03:03:22 +02:00
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FT_Error error;
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/* backup face->charmap because find_unicode_charmap sets it */
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FT_CharMap old_charmap = face->charmap;
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if (( error = find_unicode_charmap( face ) )) {
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*map = NULL;
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goto Exit;
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}
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if ( FT_NEW( *map ) )
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{
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goto Exit;
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}
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FT_Int capacity = 10;
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FT_Int size = 0;
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if ( FT_NEW_ARRAY( ( *map )->entries, capacity) )
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{
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goto Exit;
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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int failed_lookups = 0;
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#endif
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for ( FT_Int i = 0; i < AF_ADJUSTMENT_DATABASE_LENGTH; i++ )
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{
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FT_UInt32 codepoint = adjustment_database[i].codepoint;
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FT_Int glyph = FT_Get_Char_Index( face, codepoint );
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if ( glyph == 0 )
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{
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#ifdef FT_DEBUG_LEVEL_TRACE
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failed_lookups++;
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#endif
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continue;
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}
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if ( size == capacity )
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{
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capacity += capacity / 2;
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if ( FT_RENEW_ARRAY((*map)->entries, size, capacity) )
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{
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goto Exit;
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}
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}
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size++;
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( *map )->entries[i].glyph_index = glyph;
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( *map )->entries[i].codepoint = codepoint;
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}
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( *map )->length = size;
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Exit:
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face->charmap = old_charmap;
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if ( error )
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{
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FT_TRACE4(( " error while building reverse character map. Using blank map.\n" ));
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if ( *map )
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{
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FT_FREE( ( *map )->entries );
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}
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FT_FREE( *map );
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return error;
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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FT_TRACE4(( " reverse character map built successfully"\
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" with %d entries and %d failed lookups.\n", size, failed_lookups ));
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#endif
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return FT_Err_Ok;
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}
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FT_LOCAL_DEF( FT_Error )
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af_reverse_character_map_done( AF_ReverseCharacterMap map, FT_Memory memory ) {
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FT_FREE( map->entries );
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return FT_Err_Ok;
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}
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