348 lines
12 KiB
C
348 lines
12 KiB
C
/***************************************************************************/
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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 1996-2000 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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#ifdef FT_FLAT_COMPILE
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#include "cidload.h"
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#include "cidgload.h"
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#else
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#include <cid/cidload.h>
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#include <cid/cidgload.h>
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#endif
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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/ftoutln.h>
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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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#undef FT_COMPONENT
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#define FT_COMPONENT trace_cidgload
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static
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FT_Error 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_Info* cid = &face->cid;
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FT_Byte* p;
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FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes;
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FT_UInt fd_select;
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FT_ULong off1, glyph_len;
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FT_Stream stream = face->root.stream;
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FT_Error error = 0;
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/* read the CID font dict index and charstring offset from the CIDMap */
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if ( FILE_Seek( cid->data_offset + cid->cidmap_offset +
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glyph_index * entry_len) ||
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ACCESS_Frame( 2 * entry_len ) )
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goto Exit;
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p = (FT_Byte*)stream->cursor;
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fd_select = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
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off1 = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
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p += cid->fd_bytes;
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glyph_len = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
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FORGET_Frame();
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/* now, if the glyph is not empty, set up the subrs array, and parse */
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/* the charstrings */
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if ( glyph_len > 0 )
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{
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CID_FontDict* dict;
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CID_Subrs* cid_subrs = face->subrs + fd_select;
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FT_Byte* charstring;
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FT_UInt lenIV;
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FT_Memory memory = face->root.memory;
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/* setup 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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/* setup font matrix */
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dict = cid->font_dicts + fd_select;
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lenIV = dict->private_dict.lenIV;
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decoder->font_matrix = dict->font_matrix;
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decoder->font_offset = dict->font_offset;
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/* the charstrings are encoded (stupid!) */
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/* load the charstrings, then execute it */
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if ( ALLOC( charstring, glyph_len ) )
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goto Exit;
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if ( !FILE_Read_At( cid->data_offset + off1, charstring, glyph_len ) )
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{
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cid_decrypt( charstring, glyph_len, 4330 );
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error = decoder->funcs.parse_charstrings( decoder,
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charstring + lenIV,
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glyph_len - lenIV );
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}
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FREE( charstring );
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}
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Exit:
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return error;
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}
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#if 0
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/********** *********/
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/********** *********/
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/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
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/********** *********/
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/********** The following code is in charge of computing *********/
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/********** the maximum advance width of the font. It *********/
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/********** quickly processes each glyph charstring to *********/
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/********** extract the value from either a `sbw' or `seac' *********/
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/********** operator. *********/
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/********** *********/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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LOCAL_FUNC
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FT_Error CID_Compute_Max_Advance( CID_Face face,
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FT_Int* max_advance )
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{
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FT_Error error;
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T1_Decoder decoder;
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FT_Int glyph_index;
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PSAux_Interface* psaux = (PSAux_Interface*)face->psaux;
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*max_advance = 0;
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/* Initialize load decoder */
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error = psaux->t1_decoder_funcs->init( &decoder,
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(FT_Face)face,
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0, /* size */
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0, /* glyph slot */
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0, /* glyph names !!!! XXXXX */
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0, /* blend == 0 */
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cid_load_glyph );
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if (error)
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return error;
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decoder.builder.metrics_only = 1;
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decoder.builder.load_points = 0;
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/* for each glyph, parse the glyph charstring and extract */
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/* the advance width */
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for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
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glyph_index++ )
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{
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/* now get load the unscaled outline */
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error = cid_load_glyph( &decoder, glyph_index );
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/* ignore the error if one occurred - skip to next glyph */
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}
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*max_advance = decoder.builder.advance.x;
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return T1_Err_Ok;
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}
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#endif /* 0 */
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/********** *********/
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/********** *********/
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/********** UNHINTED GLYPH LOADER *********/
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/********** *********/
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/********** The following code is in charge of loading a *********/
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/********** single outline. It completely ignores hinting *********/
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/********** and is used when FT_LOAD_NO_HINTING is set. *********/
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/********** *********/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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LOCAL_FUNC
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FT_Error CID_Load_Glyph( CID_GlyphSlot glyph,
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CID_Size size,
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FT_Int glyph_index,
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FT_Int load_flags )
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{
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FT_Error error;
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T1_Decoder decoder;
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CID_Face face = (CID_Face)glyph->root.face;
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FT_Bool hinting;
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PSAux_Interface* psaux = (PSAux_Interface*)face->psaux;
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FT_Matrix font_matrix;
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FT_Vector font_offset;
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if ( load_flags & FT_LOAD_NO_RECURSE )
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load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
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glyph->x_scale = size->root.metrics.x_scale;
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glyph->y_scale = size->root.metrics.y_scale;
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glyph->root.outline.n_points = 0;
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glyph->root.outline.n_contours = 0;
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hinting = ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
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( load_flags & FT_LOAD_NO_HINTING ) == 0;
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glyph->root.format = ft_glyph_format_outline;
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{
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error = psaux->t1_decoder_funcs->init( &decoder,
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(FT_Face)face,
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(FT_Size)size,
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(FT_GlyphSlot)glyph,
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0, /* glyph names -- XXXX */
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0, /* blend == 0 */
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cid_load_glyph );
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/* set up the decoder */
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decoder.builder.no_recurse = (load_flags & FT_LOAD_NO_RECURSE) != 0;
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error = cid_load_glyph( &decoder, glyph_index );
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font_matrix = decoder.font_matrix;
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font_offset = decoder.font_offset;
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/* save new glyph tables */
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psaux->t1_decoder_funcs->done( &decoder );
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}
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/* now, set the metrics -- this is rather simple, as */
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/* the left side bearing is the xMin, and the top side */
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/* bearing the yMax */
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if ( !error )
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{
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glyph->root.outline.flags &= ft_outline_owner;
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glyph->root.outline.flags |= ft_outline_reverse_fill;
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/* for composite glyphs, return only left side bearing and */
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/* advance width */
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if ( load_flags & FT_LOAD_NO_RECURSE )
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{
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glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
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glyph->root.metrics.horiAdvance = decoder.builder.advance.x;
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}
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else
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{
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FT_BBox cbox;
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FT_Glyph_Metrics* metrics = &glyph->root.metrics;
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/* copy the _unscaled_ advance width */
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metrics->horiAdvance = decoder.builder.advance.x;
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/* make up vertical metrics */
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metrics->vertBearingX = 0;
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metrics->vertBearingY = 0;
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metrics->vertAdvance = 0;
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glyph->root.format = ft_glyph_format_outline;
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if ( size && size->root.metrics.y_ppem < 24 )
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glyph->root.outline.flags |= ft_outline_high_precision;
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/* apply the font matrix */
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FT_Outline_Transform( &glyph->root.outline, &font_matrix );
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FT_Outline_Translate( &glyph->root.outline,
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font_offset.x,
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font_offset.y );
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if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
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{
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/* scale the outline and the metrics */
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FT_Int n;
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FT_Outline* cur = decoder.builder.base;
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FT_Vector* vec = cur->points;
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FT_Fixed x_scale = glyph->x_scale;
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FT_Fixed y_scale = glyph->y_scale;
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/* First of all, scale the points */
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for ( n = cur->n_points; n > 0; n--, vec++ )
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{
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vec->x = FT_MulFix( vec->x, x_scale );
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vec->y = FT_MulFix( vec->y, y_scale );
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}
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FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
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/* Then scale the metrics */
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metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
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metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
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metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
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metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
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}
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/* compute the other metrics */
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FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
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/* grid fit the bounding box if necessary */
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if ( hinting )
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{
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cbox.xMin &= -64;
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cbox.yMin &= -64;
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cbox.xMax = ( cbox.xMax+63 ) & -64;
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cbox.yMax = ( cbox.yMax+63 ) & -64;
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}
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metrics->width = cbox.xMax - cbox.xMin;
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metrics->height = cbox.yMax - cbox.yMin;
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metrics->horiBearingX = cbox.xMin;
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metrics->horiBearingY = cbox.yMax;
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}
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}
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return error;
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}
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/* END */
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