54876
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/****************************************************************************
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*
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* cidgload.c
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*
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* CID-keyed Type1 Glyph Loader (body).
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*
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* Copyright (C) 1996-2019 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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49234
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#include <ft2build.h>
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20 |
#include "cidload.h"
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#include "cidgload.h"
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_OUTLINE_H
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#include FT_INTERNAL_CALC_H
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#include FT_INTERNAL_POSTSCRIPT_AUX_H
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#include FT_INTERNAL_CFF_TYPES_H
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#include FT_DRIVER_H
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#include "ciderrs.h"
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54876
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/**************************************************************************
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*
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* The macro FT_COMPONENT is used in trace mode. It is an implicit
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* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
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* messages during execution.
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*/
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49234
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40 |
#undef FT_COMPONENT
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54876
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41 |
#define FT_COMPONENT cidgload
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49234
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42 |
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44 |
FT_CALLBACK_DEF( FT_Error )
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cid_load_glyph( T1_Decoder decoder,
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FT_UInt glyph_index )
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{
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CID_Face face = (CID_Face)decoder->builder.face;
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CID_FaceInfo cid = &face->cid;
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FT_Byte* p;
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FT_ULong fd_select;
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FT_Stream stream = face->cid_stream;
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FT_Error error = FT_Err_Ok;
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FT_Byte* charstring = NULL;
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55 |
FT_Memory memory = face->root.memory;
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FT_ULong glyph_length = 0;
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PSAux_Service psaux = (PSAux_Service)face->psaux;
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FT_Bool force_scaling = FALSE;
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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FT_Incremental_InterfaceRec *inc =
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face->root.internal->incremental_interface;
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#endif
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FT_TRACE1(( "cid_load_glyph: glyph index %d\n", glyph_index ));
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* For incremental fonts get the character data using */
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/* the callback function. */
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if ( inc )
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{
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FT_Data glyph_data;
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error = inc->funcs->get_glyph_data( inc->object,
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glyph_index, &glyph_data );
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if ( error )
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goto Exit;
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p = (FT_Byte*)glyph_data.pointer;
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fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
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if ( glyph_data.length != 0 )
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{
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glyph_length = (FT_ULong)( glyph_data.length - cid->fd_bytes );
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(void)FT_ALLOC( charstring, glyph_length );
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if ( !error )
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ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes,
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glyph_length );
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}
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inc->funcs->free_glyph_data( inc->object, &glyph_data );
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if ( error )
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goto Exit;
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}
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else
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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/* For ordinary fonts read the CID font dictionary index */
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/* and charstring offset from the CIDMap. */
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{
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FT_UInt entry_len = (FT_UInt)( cid->fd_bytes + cid->gd_bytes );
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FT_ULong off1, off2;
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if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
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glyph_index * entry_len ) ||
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FT_FRAME_ENTER( 2 * entry_len ) )
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goto Exit;
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p = (FT_Byte*)stream->cursor;
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fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
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off1 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
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p += cid->fd_bytes;
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off2 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
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FT_FRAME_EXIT();
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if ( fd_select >= (FT_ULong)cid->num_dicts ||
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off2 > stream->size ||
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off1 > off2 )
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{
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FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" ));
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error = FT_THROW( Invalid_Offset );
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goto Exit;
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}
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glyph_length = off2 - off1;
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if ( glyph_length == 0 )
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goto Exit;
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if ( FT_ALLOC( charstring, glyph_length ) )
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goto Exit;
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if ( FT_STREAM_READ_AT( cid->data_offset + off1,
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charstring, glyph_length ) )
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goto Exit;
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}
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/* Now set up the subrs array and parse the charstrings. */
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{
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CID_FaceDict dict;
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CID_Subrs cid_subrs = face->subrs + fd_select;
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FT_UInt cs_offset;
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/* Set up subrs */
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decoder->num_subrs = cid_subrs->num_subrs;
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decoder->subrs = cid_subrs->code;
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decoder->subrs_len = 0;
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decoder->subrs_hash = NULL;
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/* Set up font matrix */
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dict = cid->font_dicts + fd_select;
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decoder->font_matrix = dict->font_matrix;
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decoder->font_offset = dict->font_offset;
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decoder->lenIV = dict->private_dict.lenIV;
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/* Decode the charstring. */
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/* Adjustment for seed bytes. */
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cs_offset = decoder->lenIV >= 0 ? (FT_UInt)decoder->lenIV : 0;
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if ( cs_offset > glyph_length )
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{
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FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" ));
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error = FT_THROW( Invalid_Offset );
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goto Exit;
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}
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/* Decrypt only if lenIV >= 0. */
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if ( decoder->lenIV >= 0 )
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psaux->t1_decrypt( charstring, glyph_length, 4330 );
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177 |
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/* choose which renderer to use */
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#ifdef T1_CONFIG_OPTION_OLD_ENGINE
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if ( ( (PS_Driver)FT_FACE_DRIVER( face ) )->hinting_engine ==
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FT_HINTING_FREETYPE ||
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decoder->builder.metrics_only )
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error = psaux->t1_decoder_funcs->parse_charstrings_old(
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decoder,
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charstring + cs_offset,
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glyph_length - cs_offset );
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#else
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if ( decoder->builder.metrics_only )
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error = psaux->t1_decoder_funcs->parse_metrics(
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decoder,
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charstring + cs_offset,
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glyph_length - cs_offset );
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#endif
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else
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{
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PS_Decoder psdecoder;
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CFF_SubFontRec subfont;
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psaux->ps_decoder_init( &psdecoder, decoder, TRUE );
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psaux->t1_make_subfont( FT_FACE( face ),
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&dict->private_dict,
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&subfont );
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psdecoder.current_subfont = &subfont;
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error = psaux->t1_decoder_funcs->parse_charstrings(
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&psdecoder,
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charstring + cs_offset,
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glyph_length - cs_offset );
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211 |
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/* Adobe's engine uses 16.16 numbers everywhere; */
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/* as a consequence, glyphs larger than 2000ppem get rejected */
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if ( FT_ERR_EQ( error, Glyph_Too_Big ) )
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{
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/* this time, we retry unhinted and scale up the glyph later on */
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/* (the engine uses and sets the hardcoded value 0x10000 / 64 = */
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/* 0x400 for both `x_scale' and `y_scale' in this case) */
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((CID_GlyphSlot)decoder->builder.glyph)->hint = FALSE;
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220 |
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force_scaling = TRUE;
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222 |
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error = psaux->t1_decoder_funcs->parse_charstrings(
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&psdecoder,
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charstring + cs_offset,
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glyph_length - cs_offset );
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}
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}
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}
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230 |
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231 |
#ifdef FT_CONFIG_OPTION_INCREMENTAL
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232 |
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233 |
/* Incremental fonts can optionally override the metrics. */
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if ( !error && inc && inc->funcs->get_glyph_metrics )
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235 |
{
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236 |
FT_Incremental_MetricsRec metrics;
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237 |
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238 |
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239 |
metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
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240 |
metrics.bearing_y = 0;
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241 |
metrics.advance = FIXED_TO_INT( decoder->builder.advance.x );
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242 |
metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );
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243 |
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244 |
error = inc->funcs->get_glyph_metrics( inc->object,
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245 |
glyph_index, FALSE, &metrics );
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246 |
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247 |
decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
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248 |
decoder->builder.advance.x = INT_TO_FIXED( metrics.advance );
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249 |
decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v );
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250 |
}
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251 |
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252 |
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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253 |
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254 |
Exit:
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255 |
FT_FREE( charstring );
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256 |
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257 |
((CID_GlyphSlot)decoder->builder.glyph)->scaled = force_scaling;
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258 |
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259 |
return error;
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260 |
}
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261 |
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262 |
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263 |
#if 0
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264 |
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265 |
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266 |
/*************************************************************************/
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267 |
/*************************************************************************/
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268 |
/*************************************************************************/
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269 |
/********** *********/
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270 |
/********** *********/
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271 |
/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
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272 |
/********** *********/
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273 |
/********** The following code is in charge of computing *********/
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274 |
/********** the maximum advance width of the font. It *********/
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275 |
/********** quickly processes each glyph charstring to *********/
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276 |
/********** extract the value from either a `sbw' or `seac' *********/
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277 |
/********** operator. *********/
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278 |
/********** *********/
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279 |
/*************************************************************************/
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280 |
/*************************************************************************/
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281 |
/*************************************************************************/
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282 |
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283 |
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284 |
FT_LOCAL_DEF( FT_Error )
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285 |
cid_face_compute_max_advance( CID_Face face,
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286 |
FT_Int* max_advance )
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|
287 |
{
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|
288 |
FT_Error error;
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289 |
T1_DecoderRec decoder;
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290 |
FT_Int glyph_index;
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291 |
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292 |
PSAux_Service psaux = (PSAux_Service)face->psaux;
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293 |
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294 |
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|
295 |
*max_advance = 0;
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296 |
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297 |
/* Initialize load decoder */
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298 |
error = psaux->t1_decoder_funcs->init( &decoder,
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299 |
(FT_Face)face,
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|
300 |
0, /* size */
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301 |
0, /* glyph slot */
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302 |
0, /* glyph names! XXX */
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303 |
0, /* blend == 0 */
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|
304 |
0, /* hinting == 0 */
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|
305 |
cid_load_glyph );
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|
306 |
if ( error )
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|
307 |
return error;
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|
308 |
|
|
309 |
/* TODO: initialize decoder.len_buildchar and decoder.buildchar */
|
|
310 |
/* if we ever support CID-keyed multiple master fonts */
|
|
311 |
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|
312 |
decoder.builder.metrics_only = 1;
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|
313 |
decoder.builder.load_points = 0;
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|
314 |
|
|
315 |
/* for each glyph, parse the glyph charstring and extract */
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|
316 |
/* the advance width */
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|
317 |
for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
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|
318 |
glyph_index++ )
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|
319 |
{
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|
320 |
/* now get load the unscaled outline */
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|
321 |
error = cid_load_glyph( &decoder, glyph_index );
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|
322 |
/* ignore the error if one occurred - skip to next glyph */
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|
323 |
}
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|
324 |
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|
325 |
*max_advance = FIXED_TO_INT( decoder.builder.advance.x );
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|
326 |
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|
327 |
psaux->t1_decoder_funcs->done( &decoder );
|
|
328 |
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|
329 |
return FT_Err_Ok;
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|
330 |
}
|
|
331 |
|
|
332 |
|
|
333 |
#endif /* 0 */
|
|
334 |
|
|
335 |
|
|
336 |
FT_LOCAL_DEF( FT_Error )
|
|
337 |
cid_slot_load_glyph( FT_GlyphSlot cidglyph, /* CID_GlyphSlot */
|
|
338 |
FT_Size cidsize, /* CID_Size */
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|
339 |
FT_UInt glyph_index,
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|
340 |
FT_Int32 load_flags )
|
|
341 |
{
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|
342 |
CID_GlyphSlot glyph = (CID_GlyphSlot)cidglyph;
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|
343 |
FT_Error error;
|
|
344 |
T1_DecoderRec decoder;
|
|
345 |
CID_Face face = (CID_Face)cidglyph->face;
|
|
346 |
FT_Bool hinting;
|
|
347 |
FT_Bool scaled;
|
|
348 |
|
|
349 |
PSAux_Service psaux = (PSAux_Service)face->psaux;
|
|
350 |
FT_Matrix font_matrix;
|
|
351 |
FT_Vector font_offset;
|
|
352 |
FT_Bool must_finish_decoder = FALSE;
|
|
353 |
|
|
354 |
|
|
355 |
if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
|
|
356 |
{
|
|
357 |
error = FT_THROW( Invalid_Argument );
|
|
358 |
goto Exit;
|
|
359 |
}
|
|
360 |
|
|
361 |
if ( load_flags & FT_LOAD_NO_RECURSE )
|
|
362 |
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
|
|
363 |
|
|
364 |
glyph->x_scale = cidsize->metrics.x_scale;
|
|
365 |
glyph->y_scale = cidsize->metrics.y_scale;
|
|
366 |
|
|
367 |
cidglyph->outline.n_points = 0;
|
|
368 |
cidglyph->outline.n_contours = 0;
|
|
369 |
|
|
370 |
hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
|
|
371 |
( load_flags & FT_LOAD_NO_HINTING ) == 0 );
|
|
372 |
scaled = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );
|
|
373 |
|
|
374 |
glyph->hint = hinting;
|
|
375 |
glyph->scaled = scaled;
|
|
376 |
cidglyph->format = FT_GLYPH_FORMAT_OUTLINE;
|
|
377 |
|
|
378 |
error = psaux->t1_decoder_funcs->init( &decoder,
|
|
379 |
cidglyph->face,
|
|
380 |
cidsize,
|
|
381 |
cidglyph,
|
|
382 |
0, /* glyph names -- XXX */
|
|
383 |
0, /* blend == 0 */
|
|
384 |
hinting,
|
|
385 |
FT_LOAD_TARGET_MODE( load_flags ),
|
|
386 |
cid_load_glyph );
|
|
387 |
if ( error )
|
|
388 |
goto Exit;
|
|
389 |
|
|
390 |
/* TODO: initialize decoder.len_buildchar and decoder.buildchar */
|
|
391 |
/* if we ever support CID-keyed multiple master fonts */
|
|
392 |
|
|
393 |
must_finish_decoder = TRUE;
|
|
394 |
|
|
395 |
/* set up the decoder */
|
54876
|
396 |
decoder.builder.no_recurse = FT_BOOL( load_flags & FT_LOAD_NO_RECURSE );
|
49234
|
397 |
|
|
398 |
error = cid_load_glyph( &decoder, glyph_index );
|
|
399 |
if ( error )
|
|
400 |
goto Exit;
|
|
401 |
|
|
402 |
/* copy flags back for forced scaling */
|
|
403 |
hinting = glyph->hint;
|
|
404 |
scaled = glyph->scaled;
|
|
405 |
|
|
406 |
font_matrix = decoder.font_matrix;
|
|
407 |
font_offset = decoder.font_offset;
|
|
408 |
|
|
409 |
/* save new glyph tables */
|
|
410 |
psaux->t1_decoder_funcs->done( &decoder );
|
|
411 |
|
|
412 |
must_finish_decoder = FALSE;
|
|
413 |
|
|
414 |
/* now set the metrics -- this is rather simple, as */
|
|
415 |
/* the left side bearing is the xMin, and the top side */
|
|
416 |
/* bearing the yMax */
|
|
417 |
cidglyph->outline.flags &= FT_OUTLINE_OWNER;
|
|
418 |
cidglyph->outline.flags |= FT_OUTLINE_REVERSE_FILL;
|
|
419 |
|
|
420 |
/* for composite glyphs, return only left side bearing and */
|
|
421 |
/* advance width */
|
|
422 |
if ( load_flags & FT_LOAD_NO_RECURSE )
|
|
423 |
{
|
|
424 |
FT_Slot_Internal internal = cidglyph->internal;
|
|
425 |
|
|
426 |
|
|
427 |
cidglyph->metrics.horiBearingX =
|
|
428 |
FIXED_TO_INT( decoder.builder.left_bearing.x );
|
|
429 |
cidglyph->metrics.horiAdvance =
|
|
430 |
FIXED_TO_INT( decoder.builder.advance.x );
|
|
431 |
|
|
432 |
internal->glyph_matrix = font_matrix;
|
|
433 |
internal->glyph_delta = font_offset;
|
|
434 |
internal->glyph_transformed = 1;
|
|
435 |
}
|
|
436 |
else
|
|
437 |
{
|
|
438 |
FT_BBox cbox;
|
|
439 |
FT_Glyph_Metrics* metrics = &cidglyph->metrics;
|
|
440 |
|
|
441 |
|
|
442 |
/* copy the _unscaled_ advance width */
|
|
443 |
metrics->horiAdvance =
|
|
444 |
FIXED_TO_INT( decoder.builder.advance.x );
|
|
445 |
cidglyph->linearHoriAdvance =
|
|
446 |
FIXED_TO_INT( decoder.builder.advance.x );
|
|
447 |
cidglyph->internal->glyph_transformed = 0;
|
|
448 |
|
|
449 |
/* make up vertical ones */
|
|
450 |
metrics->vertAdvance = ( face->cid.font_bbox.yMax -
|
|
451 |
face->cid.font_bbox.yMin ) >> 16;
|
|
452 |
cidglyph->linearVertAdvance = metrics->vertAdvance;
|
|
453 |
|
|
454 |
cidglyph->format = FT_GLYPH_FORMAT_OUTLINE;
|
|
455 |
|
|
456 |
if ( cidsize->metrics.y_ppem < 24 )
|
|
457 |
cidglyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
|
|
458 |
|
|
459 |
/* apply the font matrix, if any */
|
|
460 |
if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L ||
|
|
461 |
font_matrix.xy != 0 || font_matrix.yx != 0 )
|
|
462 |
{
|
|
463 |
FT_Outline_Transform( &cidglyph->outline, &font_matrix );
|
|
464 |
|
|
465 |
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
|
|
466 |
font_matrix.xx );
|
|
467 |
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance,
|
|
468 |
font_matrix.yy );
|
|
469 |
}
|
|
470 |
|
|
471 |
if ( font_offset.x || font_offset.y )
|
|
472 |
{
|
|
473 |
FT_Outline_Translate( &cidglyph->outline,
|
|
474 |
font_offset.x,
|
|
475 |
font_offset.y );
|
|
476 |
|
|
477 |
metrics->horiAdvance += font_offset.x;
|
|
478 |
metrics->vertAdvance += font_offset.y;
|
|
479 |
}
|
|
480 |
|
|
481 |
if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || scaled )
|
|
482 |
{
|
|
483 |
/* scale the outline and the metrics */
|
|
484 |
FT_Int n;
|
|
485 |
FT_Outline* cur = decoder.builder.base;
|
|
486 |
FT_Vector* vec = cur->points;
|
|
487 |
FT_Fixed x_scale = glyph->x_scale;
|
|
488 |
FT_Fixed y_scale = glyph->y_scale;
|
|
489 |
|
|
490 |
|
|
491 |
/* First of all, scale the points */
|
|
492 |
if ( !hinting || !decoder.builder.hints_funcs )
|
|
493 |
for ( n = cur->n_points; n > 0; n--, vec++ )
|
|
494 |
{
|
|
495 |
vec->x = FT_MulFix( vec->x, x_scale );
|
|
496 |
vec->y = FT_MulFix( vec->y, y_scale );
|
|
497 |
}
|
|
498 |
|
|
499 |
/* Then scale the metrics */
|
|
500 |
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
|
|
501 |
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
|
|
502 |
}
|
|
503 |
|
|
504 |
/* compute the other metrics */
|
|
505 |
FT_Outline_Get_CBox( &cidglyph->outline, &cbox );
|
|
506 |
|
|
507 |
metrics->width = cbox.xMax - cbox.xMin;
|
|
508 |
metrics->height = cbox.yMax - cbox.yMin;
|
|
509 |
|
|
510 |
metrics->horiBearingX = cbox.xMin;
|
|
511 |
metrics->horiBearingY = cbox.yMax;
|
|
512 |
|
|
513 |
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
|
|
514 |
{
|
|
515 |
/* make up vertical ones */
|
|
516 |
ft_synthesize_vertical_metrics( metrics,
|
|
517 |
metrics->vertAdvance );
|
|
518 |
}
|
|
519 |
}
|
|
520 |
|
|
521 |
Exit:
|
|
522 |
|
|
523 |
if ( must_finish_decoder )
|
|
524 |
psaux->t1_decoder_funcs->done( &decoder );
|
|
525 |
|
|
526 |
return error;
|
|
527 |
}
|
|
528 |
|
|
529 |
|
|
530 |
/* END */
|