Edit
kc3-lang/freetype/src/cid/cidgload.c
Werner Lemberg
- src/cid/cidgload.c
-
/**************************************************************************** * * cidgload.c * * CID-keyed Type1 Glyph Loader (body). * * Copyright (C) 1996-2023 by * David Turner, Robert Wilhelm, and Werner Lemberg. * * This file is part of the FreeType project, and may only be used, * modified, and distributed under the terms of the FreeType project * license, LICENSE.TXT. By continuing to use, modify, or distribute * this file you indicate that you have read the license and * understand and accept it fully. * */ #include "cidload.h" #include "cidgload.h" #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include <freetype/ftoutln.h> #include <freetype/internal/ftcalc.h> #include <freetype/internal/psaux.h> #include <freetype/internal/cfftypes.h> #include <freetype/ftdriver.h> #include "ciderrs.h" /************************************************************************** * * The macro FT_COMPONENT is used in trace mode. It is an implicit * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log * messages during execution. */ #undef FT_COMPONENT #define FT_COMPONENT cidgload FT_CALLBACK_DEF( FT_Error ) cid_load_glyph( T1_Decoder decoder, FT_UInt glyph_index ) { CID_Face face = (CID_Face)decoder->builder.face; CID_FaceInfo cid = &face->cid; FT_Byte* p; FT_ULong fd_select; FT_Stream stream = face->cid_stream; FT_Error error = FT_Err_Ok; FT_Byte* charstring = NULL; FT_Memory memory = face->root.memory; FT_ULong glyph_length = 0; PSAux_Service psaux = (PSAux_Service)face->psaux; FT_Bool force_scaling = FALSE; #ifdef FT_CONFIG_OPTION_INCREMENTAL FT_Incremental_InterfaceRec *inc = face->root.internal->incremental_interface; #endif FT_TRACE1(( "cid_load_glyph: glyph index %u\n", glyph_index )); #ifdef FT_CONFIG_OPTION_INCREMENTAL /* For incremental fonts get the character data using */ /* the callback function. */ if ( inc ) { FT_Data glyph_data; error = inc->funcs->get_glyph_data( inc->object, glyph_index, &glyph_data ); if ( error || glyph_data.length < cid->fd_bytes ) goto Exit; p = (FT_Byte*)glyph_data.pointer; fd_select = cid_get_offset( &p, cid->fd_bytes ); glyph_length = glyph_data.length - cid->fd_bytes; if ( !FT_QALLOC( charstring, glyph_length ) ) FT_MEM_COPY( charstring, glyph_data.pointer + cid->fd_bytes, glyph_length ); inc->funcs->free_glyph_data( inc->object, &glyph_data ); if ( error ) goto Exit; } else #endif /* FT_CONFIG_OPTION_INCREMENTAL */ /* For ordinary fonts read the CID font dictionary index */ /* and charstring offset from the CIDMap. */ { FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes; FT_ULong off1, off2; if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset + glyph_index * entry_len ) || FT_FRAME_ENTER( 2 * entry_len ) ) goto Exit; p = (FT_Byte*)stream->cursor; fd_select = cid_get_offset( &p, cid->fd_bytes ); off1 = cid_get_offset( &p, cid->gd_bytes ); p += cid->fd_bytes; off2 = cid_get_offset( &p, cid->gd_bytes ); FT_FRAME_EXIT(); if ( fd_select >= cid->num_dicts || off2 > stream->size || off1 > off2 ) { FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" )); error = FT_THROW( Invalid_Offset ); goto Exit; } glyph_length = off2 - off1; if ( glyph_length == 0 || FT_QALLOC( charstring, glyph_length ) || FT_STREAM_READ_AT( cid->data_offset + off1, charstring, glyph_length ) ) goto Exit; } /* Now set up the subrs array and parse the charstrings. */ { CID_FaceDict dict; CID_Subrs cid_subrs = face->subrs + fd_select; FT_UInt cs_offset; /* Set up subrs */ decoder->num_subrs = cid_subrs->num_subrs; decoder->subrs = cid_subrs->code; decoder->subrs_len = 0; decoder->subrs_hash = NULL; /* Set up font matrix */ dict = cid->font_dicts + fd_select; decoder->font_matrix = dict->font_matrix; decoder->font_offset = dict->font_offset; decoder->lenIV = dict->private_dict.lenIV; /* Decode the charstring. */ /* Adjustment for seed bytes. */ cs_offset = decoder->lenIV >= 0 ? (FT_UInt)decoder->lenIV : 0; if ( cs_offset > glyph_length ) { FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" )); error = FT_THROW( Invalid_Offset ); goto Exit; } /* Decrypt only if lenIV >= 0. */ if ( decoder->lenIV >= 0 ) psaux->t1_decrypt( charstring, glyph_length, 4330 ); /* choose which renderer to use */ #ifdef T1_CONFIG_OPTION_OLD_ENGINE if ( ( (PS_Driver)FT_FACE_DRIVER( face ) )->hinting_engine == FT_HINTING_FREETYPE || decoder->builder.metrics_only ) error = psaux->t1_decoder_funcs->parse_charstrings_old( decoder, charstring + cs_offset, glyph_length - cs_offset ); #else if ( decoder->builder.metrics_only ) error = psaux->t1_decoder_funcs->parse_metrics( decoder, charstring + cs_offset, glyph_length - cs_offset ); #endif else { PS_Decoder psdecoder; CFF_SubFontRec subfont; psaux->ps_decoder_init( &psdecoder, decoder, TRUE ); psaux->t1_make_subfont( FT_FACE( face ), &dict->private_dict, &subfont ); psdecoder.current_subfont = &subfont; error = psaux->t1_decoder_funcs->parse_charstrings( &psdecoder, charstring + cs_offset, glyph_length - cs_offset ); /* Adobe's engine uses 16.16 numbers everywhere; */ /* as a consequence, glyphs larger than 2000ppem get rejected */ if ( FT_ERR_EQ( error, Glyph_Too_Big ) ) { /* this time, we retry unhinted and scale up the glyph later on */ /* (the engine uses and sets the hardcoded value 0x10000 / 64 = */ /* 0x400 for both `x_scale' and `y_scale' in this case) */ ((CID_GlyphSlot)decoder->builder.glyph)->hint = FALSE; force_scaling = TRUE; error = psaux->t1_decoder_funcs->parse_charstrings( &psdecoder, charstring + cs_offset, glyph_length - cs_offset ); } } } #ifdef FT_CONFIG_OPTION_INCREMENTAL /* Incremental fonts can optionally override the metrics. */ if ( !error && inc && inc->funcs->get_glyph_metrics ) { FT_Incremental_MetricsRec metrics; metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x ); metrics.bearing_y = 0; metrics.advance = FIXED_TO_INT( decoder->builder.advance.x ); metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y ); error = inc->funcs->get_glyph_metrics( inc->object, glyph_index, FALSE, &metrics ); decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x ); decoder->builder.advance.x = INT_TO_FIXED( metrics.advance ); decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v ); } #endif /* FT_CONFIG_OPTION_INCREMENTAL */ Exit: FT_FREE( charstring ); ((CID_GlyphSlot)decoder->builder.glyph)->scaled = force_scaling; return error; } #if 0 /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** *********/ /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ /********** *********/ /********** The following code is in charge of computing *********/ /********** the maximum advance width of the font. It *********/ /********** quickly processes each glyph charstring to *********/ /********** extract the value from either a `sbw' or `seac' *********/ /********** operator. *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( FT_Error ) cid_face_compute_max_advance( CID_Face face, FT_Int* max_advance ) { FT_Error error; T1_DecoderRec decoder; FT_Int glyph_index; PSAux_Service psaux = (PSAux_Service)face->psaux; *max_advance = 0; /* Initialize load decoder */ error = psaux->t1_decoder_funcs->init( &decoder, (FT_Face)face, 0, /* size */ 0, /* glyph slot */ 0, /* glyph names! XXX */ 0, /* blend == 0 */ 0, /* hinting == 0 */ cid_load_glyph ); if ( error ) return error; /* TODO: initialize decoder.len_buildchar and decoder.buildchar */ /* if we ever support CID-keyed multiple master fonts */ decoder.builder.metrics_only = 1; decoder.builder.load_points = 0; /* for each glyph, parse the glyph charstring and extract */ /* the advance width */ for ( glyph_index = 0; glyph_index < face->root.num_glyphs; glyph_index++ ) { /* now get load the unscaled outline */ error = cid_load_glyph( &decoder, glyph_index ); /* ignore the error if one occurred - skip to next glyph */ } *max_advance = FIXED_TO_INT( decoder.builder.advance.x ); psaux->t1_decoder_funcs->done( &decoder ); return FT_Err_Ok; } #endif /* 0 */ FT_LOCAL_DEF( FT_Error ) cid_slot_load_glyph( FT_GlyphSlot cidglyph, /* CID_GlyphSlot */ FT_Size cidsize, /* CID_Size */ FT_UInt glyph_index, FT_Int32 load_flags ) { CID_GlyphSlot glyph = (CID_GlyphSlot)cidglyph; FT_Error error; T1_DecoderRec decoder; CID_Face face = (CID_Face)cidglyph->face; FT_Bool hinting; FT_Bool scaled; PSAux_Service psaux = (PSAux_Service)face->psaux; FT_Matrix font_matrix; FT_Vector font_offset; FT_Bool must_finish_decoder = FALSE; if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) { error = FT_THROW( Invalid_Argument ); goto Exit; } if ( load_flags & FT_LOAD_NO_RECURSE ) load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; glyph->x_scale = cidsize->metrics.x_scale; glyph->y_scale = cidsize->metrics.y_scale; cidglyph->outline.n_points = 0; cidglyph->outline.n_contours = 0; hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 && ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); scaled = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ); glyph->hint = hinting; glyph->scaled = scaled; cidglyph->format = FT_GLYPH_FORMAT_OUTLINE; error = psaux->t1_decoder_funcs->init( &decoder, cidglyph->face, cidsize, cidglyph, 0, /* glyph names -- XXX */ 0, /* blend == 0 */ hinting, FT_LOAD_TARGET_MODE( load_flags ), cid_load_glyph ); if ( error ) goto Exit; /* TODO: initialize decoder.len_buildchar and decoder.buildchar */ /* if we ever support CID-keyed multiple master fonts */ must_finish_decoder = TRUE; /* set up the decoder */ decoder.builder.no_recurse = FT_BOOL( load_flags & FT_LOAD_NO_RECURSE ); error = cid_load_glyph( &decoder, glyph_index ); if ( error ) goto Exit; /* copy flags back for forced scaling */ hinting = glyph->hint; scaled = glyph->scaled; font_matrix = decoder.font_matrix; font_offset = decoder.font_offset; /* save new glyph tables */ psaux->t1_decoder_funcs->done( &decoder ); must_finish_decoder = FALSE; /* now set the metrics -- this is rather simple, as */ /* the left side bearing is the xMin, and the top side */ /* bearing the yMax */ cidglyph->outline.flags &= FT_OUTLINE_OWNER; cidglyph->outline.flags |= FT_OUTLINE_REVERSE_FILL; /* for composite glyphs, return only left side bearing and */ /* advance width */ if ( load_flags & FT_LOAD_NO_RECURSE ) { FT_Slot_Internal internal = cidglyph->internal; cidglyph->metrics.horiBearingX = FIXED_TO_INT( decoder.builder.left_bearing.x ); cidglyph->metrics.horiAdvance = FIXED_TO_INT( decoder.builder.advance.x ); internal->glyph_matrix = font_matrix; internal->glyph_delta = font_offset; internal->glyph_transformed = 1; } else { FT_BBox cbox; FT_Glyph_Metrics* metrics = &cidglyph->metrics; /* copy the _unscaled_ advance width */ metrics->horiAdvance = FIXED_TO_INT( decoder.builder.advance.x ); cidglyph->linearHoriAdvance = FIXED_TO_INT( decoder.builder.advance.x ); cidglyph->internal->glyph_transformed = 0; /* make up vertical ones */ metrics->vertAdvance = ( face->cid.font_bbox.yMax - face->cid.font_bbox.yMin ) >> 16; cidglyph->linearVertAdvance = metrics->vertAdvance; cidglyph->format = FT_GLYPH_FORMAT_OUTLINE; if ( cidsize->metrics.y_ppem < 24 ) cidglyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; /* 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( &cidglyph->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( &cidglyph->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 || scaled ) { /* scale the outline and the metrics */ FT_Int n; FT_Outline* cur = decoder.builder.base; 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( &cidglyph->outline, &cbox ); metrics->width = cbox.xMax - cbox.xMin; metrics->height = cbox.yMax - cbox.yMin; metrics->horiBearingX = cbox.xMin; metrics->horiBearingY = cbox.yMax; if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) { /* make up vertical ones */ ft_synthesize_vertical_metrics( metrics, metrics->vertAdvance ); } } Exit: if ( must_finish_decoder ) psaux->t1_decoder_funcs->done( &decoder ); return error; } /* END */