685 lines
23 KiB
C
685 lines
23 KiB
C
/****************************************************************************
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*
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* cffgload.c
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*
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* OpenType Glyph Loader (body).
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*
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* Copyright (C) 1996-2021 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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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/internal/sfnt.h>
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#include <freetype/internal/ftcalc.h>
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#include <freetype/internal/psaux.h>
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#include <freetype/ftoutln.h>
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#include <freetype/ftdriver.h>
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#include "cffload.h"
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#include "cffgload.h"
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#include "cfferrs.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 cffgload
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FT_LOCAL_DEF( FT_Error )
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cff_get_glyph_data( TT_Face face,
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FT_UInt glyph_index,
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FT_Byte** pointer,
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FT_ULong* length )
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{
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* For incremental fonts get the character data using the */
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/* callback function. */
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if ( face->root.internal->incremental_interface )
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{
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FT_Data data;
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FT_Error error =
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face->root.internal->incremental_interface->funcs->get_glyph_data(
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face->root.internal->incremental_interface->object,
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glyph_index, &data );
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*pointer = (FT_Byte*)data.pointer;
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*length = (FT_ULong)data.length;
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return error;
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}
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else
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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{
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CFF_Font cff = (CFF_Font)(face->extra.data);
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return cff_index_access_element( &cff->charstrings_index, glyph_index,
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pointer, length );
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}
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}
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FT_LOCAL_DEF( void )
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cff_free_glyph_data( TT_Face face,
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FT_Byte** pointer,
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FT_ULong length )
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{
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#ifndef FT_CONFIG_OPTION_INCREMENTAL
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FT_UNUSED( length );
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#endif
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* For incremental fonts get the character data using the */
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/* callback function. */
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if ( face->root.internal->incremental_interface )
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{
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FT_Data data;
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data.pointer = *pointer;
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data.length = (FT_Int)length;
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face->root.internal->incremental_interface->funcs->free_glyph_data(
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face->root.internal->incremental_interface->object, &data );
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}
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else
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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{
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CFF_Font cff = (CFF_Font)(face->extra.data);
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cff_index_forget_element( &cff->charstrings_index, pointer );
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}
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}
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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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#if 0 /* unused until we support pure CFF fonts */
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FT_LOCAL_DEF( FT_Error )
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cff_compute_max_advance( TT_Face face,
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FT_Int* max_advance )
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{
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FT_Error error = FT_Err_Ok;
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CFF_Decoder decoder;
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FT_Int glyph_index;
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CFF_Font cff = (CFF_Font)face->other;
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PSAux_Service psaux = (PSAux_Service)face->psaux;
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const CFF_Decoder_Funcs decoder_funcs = psaux->cff_decoder_funcs;
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*max_advance = 0;
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/* Initialize load decoder */
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decoder_funcs->init( &decoder, face, 0, 0, 0, 0, 0, 0 );
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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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FT_Byte* charstring;
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FT_ULong charstring_len;
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/* now get load the unscaled outline */
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error = cff_get_glyph_data( face, glyph_index,
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&charstring, &charstring_len );
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if ( !error )
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{
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error = decoder_funcs->prepare( &decoder, size, glyph_index );
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if ( !error )
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error = decoder_funcs->parse_charstrings_old( &decoder,
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charstring,
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charstring_len,
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0 );
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cff_free_glyph_data( face, &charstring, &charstring_len );
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}
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/* ignore the error if one has occurred -- skip to next glyph */
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error = FT_Err_Ok;
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}
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*max_advance = decoder.builder.advance.x;
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return FT_Err_Ok;
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}
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#endif /* 0 */
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FT_LOCAL_DEF( FT_Error )
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cff_slot_load( CFF_GlyphSlot glyph,
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CFF_Size size,
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FT_UInt glyph_index,
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FT_Int32 load_flags )
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{
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FT_Error error;
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CFF_Decoder decoder;
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PS_Decoder psdecoder;
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TT_Face face = (TT_Face)glyph->root.face;
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FT_Bool hinting, scaled, force_scaling;
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CFF_Font cff = (CFF_Font)face->extra.data;
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PSAux_Service psaux = (PSAux_Service)face->psaux;
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const CFF_Decoder_Funcs decoder_funcs = psaux->cff_decoder_funcs;
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FT_Matrix font_matrix;
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FT_Vector font_offset;
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force_scaling = FALSE;
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/* in a CID-keyed font, consider `glyph_index' as a CID and map */
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/* it immediately to the real glyph_index -- if it isn't a */
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/* subsetted font, glyph_indices and CIDs are identical, though */
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if ( cff->top_font.font_dict.cid_registry != 0xFFFFU &&
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cff->charset.cids )
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{
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/* don't handle CID 0 (.notdef) which is directly mapped to GID 0 */
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if ( glyph_index != 0 )
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{
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glyph_index = cff_charset_cid_to_gindex( &cff->charset,
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glyph_index );
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if ( glyph_index == 0 )
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return FT_THROW( Invalid_Argument );
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}
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}
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else if ( glyph_index >= cff->num_glyphs )
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return FT_THROW( Invalid_Argument );
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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 = 0x10000L;
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glyph->y_scale = 0x10000L;
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if ( size )
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{
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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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}
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#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
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/* try to load embedded bitmap if any */
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/* */
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/* XXX: The convention should be emphasized in */
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/* the documents because it can be confusing. */
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if ( size )
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{
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CFF_Face cff_face = (CFF_Face)size->root.face;
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SFNT_Service sfnt = (SFNT_Service)cff_face->sfnt;
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FT_Stream stream = cff_face->root.stream;
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if ( size->strike_index != 0xFFFFFFFFUL &&
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sfnt->load_eblc &&
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( load_flags & FT_LOAD_NO_BITMAP ) == 0 )
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{
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TT_SBit_MetricsRec metrics;
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error = sfnt->load_sbit_image( face,
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size->strike_index,
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glyph_index,
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(FT_UInt)load_flags,
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stream,
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&glyph->root.bitmap,
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&metrics );
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if ( !error )
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{
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FT_Bool has_vertical_info;
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FT_UShort advance;
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FT_Short dummy;
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glyph->root.outline.n_points = 0;
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glyph->root.outline.n_contours = 0;
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glyph->root.metrics.width = (FT_Pos)metrics.width * 64;
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glyph->root.metrics.height = (FT_Pos)metrics.height * 64;
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glyph->root.metrics.horiBearingX = (FT_Pos)metrics.horiBearingX * 64;
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glyph->root.metrics.horiBearingY = (FT_Pos)metrics.horiBearingY * 64;
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glyph->root.metrics.horiAdvance = (FT_Pos)metrics.horiAdvance * 64;
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glyph->root.metrics.vertBearingX = (FT_Pos)metrics.vertBearingX * 64;
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glyph->root.metrics.vertBearingY = (FT_Pos)metrics.vertBearingY * 64;
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glyph->root.metrics.vertAdvance = (FT_Pos)metrics.vertAdvance * 64;
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glyph->root.format = FT_GLYPH_FORMAT_BITMAP;
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if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
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{
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glyph->root.bitmap_left = metrics.vertBearingX;
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glyph->root.bitmap_top = metrics.vertBearingY;
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}
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else
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{
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glyph->root.bitmap_left = metrics.horiBearingX;
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glyph->root.bitmap_top = metrics.horiBearingY;
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}
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/* compute linear advance widths */
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(void)( (SFNT_Service)face->sfnt )->get_metrics( face, 0,
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glyph_index,
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&dummy,
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&advance );
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glyph->root.linearHoriAdvance = advance;
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has_vertical_info = FT_BOOL(
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face->vertical_info &&
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face->vertical.number_Of_VMetrics > 0 );
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/* get the vertical metrics from the vmtx table if we have one */
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if ( has_vertical_info )
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{
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(void)( (SFNT_Service)face->sfnt )->get_metrics( face, 1,
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glyph_index,
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&dummy,
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&advance );
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glyph->root.linearVertAdvance = advance;
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}
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else
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{
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/* make up vertical ones */
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if ( face->os2.version != 0xFFFFU )
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glyph->root.linearVertAdvance = (FT_Pos)
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( face->os2.sTypoAscender - face->os2.sTypoDescender );
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else
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glyph->root.linearVertAdvance = (FT_Pos)
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( face->horizontal.Ascender - face->horizontal.Descender );
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}
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return error;
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}
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}
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}
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#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
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/* return immediately if we only want the embedded bitmaps */
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if ( load_flags & FT_LOAD_SBITS_ONLY )
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return FT_THROW( Invalid_Argument );
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/* if we have a CID subfont, use its matrix (which has already */
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/* been multiplied with the root matrix) */
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/* this scaling is only relevant if the PS hinter isn't active */
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if ( cff->num_subfonts )
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{
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FT_Long top_upm, sub_upm;
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FT_Byte fd_index = cff_fd_select_get( &cff->fd_select,
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glyph_index );
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if ( fd_index >= cff->num_subfonts )
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fd_index = (FT_Byte)( cff->num_subfonts - 1 );
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top_upm = (FT_Long)cff->top_font.font_dict.units_per_em;
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sub_upm = (FT_Long)cff->subfonts[fd_index]->font_dict.units_per_em;
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font_matrix = cff->subfonts[fd_index]->font_dict.font_matrix;
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font_offset = cff->subfonts[fd_index]->font_dict.font_offset;
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if ( top_upm != sub_upm )
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{
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glyph->x_scale = FT_MulDiv( glyph->x_scale, top_upm, sub_upm );
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glyph->y_scale = FT_MulDiv( glyph->y_scale, top_upm, sub_upm );
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force_scaling = TRUE;
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}
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}
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else
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{
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font_matrix = cff->top_font.font_dict.font_matrix;
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font_offset = cff->top_font.font_dict.font_offset;
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}
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glyph->root.outline.n_points = 0;
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glyph->root.outline.n_contours = 0;
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/* top-level code ensures that FT_LOAD_NO_HINTING is set */
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/* if FT_LOAD_NO_SCALE is active */
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hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
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scaled = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );
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glyph->hint = hinting;
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glyph->scaled = scaled;
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glyph->root.format = FT_GLYPH_FORMAT_OUTLINE; /* by default */
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{
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#ifdef CFF_CONFIG_OPTION_OLD_ENGINE
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PS_Driver driver = (PS_Driver)FT_FACE_DRIVER( face );
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#endif
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FT_Byte* charstring;
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FT_ULong charstring_len;
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decoder_funcs->init( &decoder, face, size, glyph, hinting,
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FT_LOAD_TARGET_MODE( load_flags ),
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cff_get_glyph_data,
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cff_free_glyph_data );
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/* this is for pure CFFs */
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if ( load_flags & FT_LOAD_ADVANCE_ONLY )
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decoder.width_only = TRUE;
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decoder.builder.no_recurse =
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FT_BOOL( load_flags & FT_LOAD_NO_RECURSE );
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/* now load the unscaled outline */
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error = cff_get_glyph_data( face, glyph_index,
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&charstring, &charstring_len );
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if ( error )
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goto Glyph_Build_Finished;
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error = decoder_funcs->prepare( &decoder, size, glyph_index );
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if ( error )
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goto Glyph_Build_Finished;
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#ifdef CFF_CONFIG_OPTION_OLD_ENGINE
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/* choose which CFF renderer to use */
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if ( driver->hinting_engine == FT_HINTING_FREETYPE )
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error = decoder_funcs->parse_charstrings_old( &decoder,
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charstring,
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charstring_len,
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0 );
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else
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#endif
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{
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psaux->ps_decoder_init( &psdecoder, &decoder, FALSE );
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error = decoder_funcs->parse_charstrings( &psdecoder,
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charstring,
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charstring_len );
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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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hinting = FALSE;
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force_scaling = TRUE;
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glyph->hint = hinting;
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error = decoder_funcs->parse_charstrings( &psdecoder,
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charstring,
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charstring_len );
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}
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}
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cff_free_glyph_data( face, &charstring, charstring_len );
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if ( error )
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goto Glyph_Build_Finished;
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* Control data and length may not be available for incremental */
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/* fonts. */
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if ( face->root.internal->incremental_interface )
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{
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glyph->root.control_data = NULL;
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glyph->root.control_len = 0;
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}
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else
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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/* We set control_data and control_len if charstrings is loaded. */
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/* See how charstring loads at cff_index_access_element() in */
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/* cffload.c. */
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{
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CFF_Index csindex = &cff->charstrings_index;
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if ( csindex->offsets )
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{
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glyph->root.control_data = csindex->bytes +
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csindex->offsets[glyph_index] - 1;
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glyph->root.control_len = (FT_Long)charstring_len;
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}
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}
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Glyph_Build_Finished:
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/* save new glyph tables, if no error */
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if ( !error )
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decoder.builder.funcs.done( &decoder.builder );
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/* XXX: anything to do for broken glyph entry? */
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}
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* Incremental fonts can optionally override the metrics. */
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if ( !error &&
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face->root.internal->incremental_interface &&
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face->root.internal->incremental_interface->funcs->get_glyph_metrics )
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{
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FT_Incremental_MetricsRec metrics;
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metrics.bearing_x = decoder.builder.left_bearing.x;
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metrics.bearing_y = 0;
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metrics.advance = decoder.builder.advance.x;
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metrics.advance_v = decoder.builder.advance.y;
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error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
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face->root.internal->incremental_interface->object,
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glyph_index, FALSE, &metrics );
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decoder.builder.left_bearing.x = metrics.bearing_x;
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decoder.builder.advance.x = metrics.advance;
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decoder.builder.advance.y = metrics.advance_v;
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}
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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if ( !error )
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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. */
|
|
|
|
/* For composite glyphs, return only left side bearing and */
|
|
/* advance width. */
|
|
if ( load_flags & FT_LOAD_NO_RECURSE )
|
|
{
|
|
FT_Slot_Internal internal = glyph->root.internal;
|
|
|
|
|
|
glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
|
|
glyph->root.metrics.horiAdvance = decoder.glyph_width;
|
|
internal->glyph_matrix = font_matrix;
|
|
internal->glyph_delta = font_offset;
|
|
internal->glyph_transformed = 1;
|
|
}
|
|
else
|
|
{
|
|
FT_BBox cbox;
|
|
FT_Glyph_Metrics* metrics = &glyph->root.metrics;
|
|
FT_Bool has_vertical_info;
|
|
|
|
|
|
if ( face->horizontal.number_Of_HMetrics )
|
|
{
|
|
FT_Short horiBearingX = 0;
|
|
FT_UShort horiAdvance = 0;
|
|
|
|
|
|
( (SFNT_Service)face->sfnt )->get_metrics( face, 0,
|
|
glyph_index,
|
|
&horiBearingX,
|
|
&horiAdvance );
|
|
metrics->horiAdvance = horiAdvance;
|
|
metrics->horiBearingX = horiBearingX;
|
|
glyph->root.linearHoriAdvance = horiAdvance;
|
|
}
|
|
else
|
|
{
|
|
/* copy the _unscaled_ advance width */
|
|
metrics->horiAdvance = decoder.glyph_width;
|
|
glyph->root.linearHoriAdvance = decoder.glyph_width;
|
|
}
|
|
|
|
glyph->root.internal->glyph_transformed = 0;
|
|
|
|
has_vertical_info = FT_BOOL( face->vertical_info &&
|
|
face->vertical.number_Of_VMetrics > 0 );
|
|
|
|
/* get the vertical metrics from the vmtx table if we have one */
|
|
if ( has_vertical_info )
|
|
{
|
|
FT_Short vertBearingY = 0;
|
|
FT_UShort vertAdvance = 0;
|
|
|
|
|
|
( (SFNT_Service)face->sfnt )->get_metrics( face, 1,
|
|
glyph_index,
|
|
&vertBearingY,
|
|
&vertAdvance );
|
|
metrics->vertBearingY = vertBearingY;
|
|
metrics->vertAdvance = vertAdvance;
|
|
}
|
|
else
|
|
{
|
|
/* make up vertical ones */
|
|
if ( face->os2.version != 0xFFFFU )
|
|
metrics->vertAdvance = (FT_Pos)( face->os2.sTypoAscender -
|
|
face->os2.sTypoDescender );
|
|
else
|
|
metrics->vertAdvance = (FT_Pos)( face->horizontal.Ascender -
|
|
face->horizontal.Descender );
|
|
}
|
|
|
|
glyph->root.linearVertAdvance = metrics->vertAdvance;
|
|
|
|
glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
|
|
|
|
glyph->root.outline.flags = 0;
|
|
if ( size && size->root.metrics.y_ppem < 24 )
|
|
glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;
|
|
|
|
glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;
|
|
|
|
/* apply the font matrix, if any */
|
|
if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L ||
|
|
font_matrix.xy != 0 || font_matrix.yx != 0 )
|
|
{
|
|
FT_Outline_Transform( &glyph->root.outline, &font_matrix );
|
|
|
|
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
|
|
font_matrix.xx );
|
|
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance,
|
|
font_matrix.yy );
|
|
}
|
|
|
|
if ( font_offset.x || font_offset.y )
|
|
{
|
|
FT_Outline_Translate( &glyph->root.outline,
|
|
font_offset.x,
|
|
font_offset.y );
|
|
|
|
metrics->horiAdvance += font_offset.x;
|
|
metrics->vertAdvance += font_offset.y;
|
|
}
|
|
|
|
if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling )
|
|
{
|
|
/* scale the outline and the metrics */
|
|
FT_Int n;
|
|
FT_Outline* cur = &glyph->root.outline;
|
|
FT_Vector* vec = cur->points;
|
|
FT_Fixed x_scale = glyph->x_scale;
|
|
FT_Fixed y_scale = glyph->y_scale;
|
|
|
|
|
|
/* First of all, scale the points */
|
|
if ( !hinting || !decoder.builder.hints_funcs )
|
|
for ( n = cur->n_points; n > 0; n--, vec++ )
|
|
{
|
|
vec->x = FT_MulFix( vec->x, x_scale );
|
|
vec->y = FT_MulFix( vec->y, y_scale );
|
|
}
|
|
|
|
/* Then scale the metrics */
|
|
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
|
|
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
|
|
}
|
|
|
|
/* compute the other metrics */
|
|
FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
|
|
|
|
metrics->width = cbox.xMax - cbox.xMin;
|
|
metrics->height = cbox.yMax - cbox.yMin;
|
|
|
|
metrics->horiBearingX = cbox.xMin;
|
|
metrics->horiBearingY = cbox.yMax;
|
|
|
|
if ( has_vertical_info )
|
|
{
|
|
metrics->vertBearingX = metrics->horiBearingX -
|
|
metrics->horiAdvance / 2;
|
|
metrics->vertBearingY = FT_MulFix( metrics->vertBearingY,
|
|
glyph->y_scale );
|
|
}
|
|
else
|
|
{
|
|
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
|
|
ft_synthesize_vertical_metrics( metrics,
|
|
metrics->vertAdvance );
|
|
}
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/* END */
|