Edit
kc3-lang/freetype/src/type1/t1gload.c
Alexei Podtelezhnikov
- src/type1/t1gload.c
-
/**************************************************************************** * * t1gload.c * * Type 1 Glyph Loader (body). * * Copyright (C) 1996-2024 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 "t1gload.h" #include <freetype/internal/ftcalc.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include <freetype/ftoutln.h> #include <freetype/internal/psaux.h> #include <freetype/internal/cfftypes.h> #include <freetype/ftdriver.h> #include "t1errors.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 t1gload static FT_Error T1_Parse_Glyph_And_Get_Char_String( T1_Decoder decoder, FT_UInt glyph_index, FT_Data* char_string, FT_Bool* force_scaling ) { T1_Face face = (T1_Face)decoder->builder.face; T1_Font type1 = &face->type1; FT_Error error = FT_Err_Ok; PSAux_Service psaux = (PSAux_Service)face->psaux; const T1_Decoder_Funcs decoder_funcs = psaux->t1_decoder_funcs; PS_Decoder psdecoder; #ifdef FT_CONFIG_OPTION_INCREMENTAL FT_Incremental_InterfaceRec *inc = face->root.internal->incremental_interface; #endif #ifdef T1_CONFIG_OPTION_OLD_ENGINE PS_Driver driver = (PS_Driver)FT_FACE_DRIVER( face ); #endif decoder->font_matrix = type1->font_matrix; decoder->font_offset = type1->font_offset; #ifdef FT_CONFIG_OPTION_INCREMENTAL /* For incremental fonts get the character data using the */ /* callback function. */ if ( inc ) error = inc->funcs->get_glyph_data( inc->object, glyph_index, char_string ); else #endif /* FT_CONFIG_OPTION_INCREMENTAL */ /* For ordinary fonts get the character data stored in the face record. */ { char_string->pointer = type1->charstrings[glyph_index]; char_string->length = type1->charstrings_len[glyph_index]; } if ( !error ) { /* choose which renderer to use */ #ifdef T1_CONFIG_OPTION_OLD_ENGINE if ( driver->hinting_engine == FT_HINTING_FREETYPE || decoder->builder.metrics_only ) error = decoder_funcs->parse_charstrings_old( decoder, (FT_Byte*)char_string->pointer, (FT_UInt)char_string->length ); #else if ( decoder->builder.metrics_only ) error = decoder_funcs->parse_metrics( decoder, (FT_Byte*)char_string->pointer, (FT_UInt)char_string->length ); #endif else { CFF_SubFontRec subfont; psaux->ps_decoder_init( &psdecoder, decoder, TRUE ); psaux->t1_make_subfont( FT_FACE( face ), &face->type1.private_dict, &subfont ); psdecoder.current_subfont = &subfont; error = decoder_funcs->parse_charstrings( &psdecoder, (FT_Byte*)char_string->pointer, (FT_ULong)char_string->length ); /* 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) */ ((T1_GlyphSlot)decoder->builder.glyph)->hint = FALSE; *force_scaling = TRUE; error = decoder_funcs->parse_charstrings( &psdecoder, (FT_Byte*)char_string->pointer, (FT_ULong)char_string->length ); } } } #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 */ return error; } FT_CALLBACK_DEF( FT_Error ) T1_Parse_Glyph( T1_Decoder decoder, FT_UInt glyph_index ) { FT_Data glyph_data; FT_Bool force_scaling = FALSE; FT_Error error = T1_Parse_Glyph_And_Get_Char_String( decoder, glyph_index, &glyph_data, &force_scaling ); #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( !error ) { T1_Face face = (T1_Face)decoder->builder.face; if ( face->root.internal->incremental_interface ) face->root.internal->incremental_interface->funcs->free_glyph_data( face->root.internal->incremental_interface->object, &glyph_data ); } #endif /* FT_CONFIG_OPTION_INCREMENTAL */ return error; } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** 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 ) T1_Compute_Max_Advance( T1_Face face, FT_Pos* max_advance ) { FT_Error error; T1_DecoderRec decoder; FT_Int glyph_index; T1_Font type1 = &face->type1; PSAux_Service psaux = (PSAux_Service)face->psaux; FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) ); *max_advance = 0; /* initialize load decoder */ error = psaux->t1_decoder_funcs->init( &decoder, (FT_Face)face, 0, /* size */ 0, /* glyph slot */ (FT_Byte**)type1->glyph_names, face->blend, 0, FT_RENDER_MODE_NORMAL, T1_Parse_Glyph ); if ( error ) return error; decoder.builder.metrics_only = 1; decoder.builder.load_points = 0; decoder.num_subrs = type1->num_subrs; decoder.subrs = type1->subrs; decoder.subrs_len = type1->subrs_len; decoder.subrs_hash = type1->subrs_hash; decoder.buildchar = face->buildchar; decoder.len_buildchar = face->len_buildchar; *max_advance = 0; FT_TRACE6(( "T1_Compute_Max_Advance:\n" )); /* for each glyph, parse the glyph charstring and extract */ /* the advance width */ for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ ) { /* now get load the unscaled outline */ (void)T1_Parse_Glyph( &decoder, (FT_UInt)glyph_index ); if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance ) *max_advance = decoder.builder.advance.x; /* ignore the error if one occurred - skip to next glyph */ } FT_TRACE6(( "T1_Compute_Max_Advance: max advance: %f\n", (double)*max_advance / 65536 )); psaux->t1_decoder_funcs->done( &decoder ); return FT_Err_Ok; } FT_LOCAL_DEF( FT_Error ) T1_Get_Advances( FT_Face t1face, /* T1_Face */ FT_UInt first, FT_UInt count, FT_Int32 load_flags, FT_Fixed* advances ) { T1_Face face = (T1_Face)t1face; T1_DecoderRec decoder; T1_Font type1 = &face->type1; PSAux_Service psaux = (PSAux_Service)face->psaux; FT_UInt nn; FT_Error error; FT_TRACE5(( "T1_Get_Advances:\n" )); if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) { for ( nn = 0; nn < count; nn++ ) { advances[nn] = 0; FT_TRACE5(( " idx %d: advance height 0 font units\n", first + nn )); } return FT_Err_Ok; } error = psaux->t1_decoder_funcs->init( &decoder, (FT_Face)face, 0, /* size */ 0, /* glyph slot */ (FT_Byte**)type1->glyph_names, face->blend, 0, FT_RENDER_MODE_NORMAL, T1_Parse_Glyph ); if ( error ) return error; decoder.builder.metrics_only = 1; decoder.builder.load_points = 0; decoder.num_subrs = type1->num_subrs; decoder.subrs = type1->subrs; decoder.subrs_len = type1->subrs_len; decoder.subrs_hash = type1->subrs_hash; decoder.buildchar = face->buildchar; decoder.len_buildchar = face->len_buildchar; for ( nn = 0; nn < count; nn++ ) { error = T1_Parse_Glyph( &decoder, first + nn ); if ( !error ) advances[nn] = FIXED_TO_INT( decoder.builder.advance.x ); else advances[nn] = 0; FT_TRACE5(( " idx %d: advance width %ld font unit%s\n", first + nn, advances[nn], advances[nn] == 1 ? "" : "s" )); } return FT_Err_Ok; } FT_LOCAL_DEF( FT_Error ) T1_Load_Glyph( FT_GlyphSlot t1glyph, /* T1_GlyphSlot */ FT_Size t1size, /* T1_Size */ FT_UInt glyph_index, FT_Int32 load_flags ) { T1_GlyphSlot glyph = (T1_GlyphSlot)t1glyph; FT_Error error; T1_DecoderRec decoder; T1_Face face = (T1_Face)t1glyph->face; FT_Bool hinting; FT_Bool scaled; FT_Bool force_scaling = FALSE; T1_Font type1 = &face->type1; PSAux_Service psaux = (PSAux_Service)face->psaux; const T1_Decoder_Funcs decoder_funcs = psaux->t1_decoder_funcs; FT_Matrix font_matrix; FT_Vector font_offset; FT_Data glyph_data; FT_Bool must_finish_decoder = FALSE; #ifdef FT_CONFIG_OPTION_INCREMENTAL FT_Bool glyph_data_loaded = 0; #endif #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( glyph_index >= (FT_UInt)face->root.num_glyphs && !face->root.internal->incremental_interface ) #else if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) #endif /* FT_CONFIG_OPTION_INCREMENTAL */ { error = FT_THROW( Invalid_Argument ); goto Exit; } FT_TRACE1(( "T1_Load_Glyph: glyph index %d\n", glyph_index )); FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) ); if ( load_flags & FT_LOAD_NO_RECURSE ) load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; if ( t1size ) { glyph->x_scale = t1size->metrics.x_scale; glyph->y_scale = t1size->metrics.y_scale; } else { glyph->x_scale = 0x10000L; glyph->y_scale = 0x10000L; } t1glyph->outline.n_points = 0; t1glyph->outline.n_contours = 0; hinting = FT_BOOL( !( load_flags & FT_LOAD_NO_SCALE ) && !( load_flags & FT_LOAD_NO_HINTING ) ); scaled = FT_BOOL( !( load_flags & FT_LOAD_NO_SCALE ) ); glyph->hint = hinting; glyph->scaled = scaled; t1glyph->format = FT_GLYPH_FORMAT_OUTLINE; error = decoder_funcs->init( &decoder, t1glyph->face, t1size, t1glyph, (FT_Byte**)type1->glyph_names, face->blend, hinting, FT_LOAD_TARGET_MODE( load_flags ), T1_Parse_Glyph ); if ( error ) goto Exit; must_finish_decoder = TRUE; decoder.builder.no_recurse = FT_BOOL( load_flags & FT_LOAD_NO_RECURSE ); decoder.num_subrs = type1->num_subrs; decoder.subrs = type1->subrs; decoder.subrs_len = type1->subrs_len; decoder.subrs_hash = type1->subrs_hash; decoder.buildchar = face->buildchar; decoder.len_buildchar = face->len_buildchar; /* now load the unscaled outline */ error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index, &glyph_data, &force_scaling ); if ( error ) goto Exit; #ifdef FT_CONFIG_OPTION_INCREMENTAL glyph_data_loaded = 1; #endif hinting = glyph->hint; font_matrix = decoder.font_matrix; font_offset = decoder.font_offset; /* save new glyph tables */ 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 */ if ( !error ) { t1glyph->outline.flags &= FT_OUTLINE_OWNER; t1glyph->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 = t1glyph->internal; t1glyph->metrics.horiBearingX = FIXED_TO_INT( decoder.builder.left_bearing.x ); t1glyph->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 = &t1glyph->metrics; /* copy the _unscaled_ advance width */ metrics->horiAdvance = FIXED_TO_INT( decoder.builder.advance.x ); t1glyph->linearHoriAdvance = FIXED_TO_INT( decoder.builder.advance.x ); t1glyph->internal->glyph_transformed = 0; if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) { /* make up vertical ones */ metrics->vertAdvance = ( face->type1.font_bbox.yMax - face->type1.font_bbox.yMin ) >> 16; t1glyph->linearVertAdvance = metrics->vertAdvance; } else { metrics->vertAdvance = FIXED_TO_INT( decoder.builder.advance.y ); t1glyph->linearVertAdvance = FIXED_TO_INT( decoder.builder.advance.y ); } t1glyph->format = FT_GLYPH_FORMAT_OUTLINE; if ( t1size && t1size->metrics.y_ppem < 24 ) t1glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; #if 1 /* 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( &t1glyph->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( &t1glyph->outline, font_offset.x, font_offset.y ); metrics->horiAdvance += font_offset.x; metrics->vertAdvance += font_offset.y; } #endif if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling ) { /* 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 we are not hinting */ 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( &t1glyph->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 ); } } /* Set control data to the glyph charstrings. Note that this is */ /* _not_ zero-terminated. */ t1glyph->control_data = (FT_Byte*)glyph_data.pointer; t1glyph->control_len = glyph_data.length; } Exit: #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( glyph_data_loaded && face->root.internal->incremental_interface ) { face->root.internal->incremental_interface->funcs->free_glyph_data( face->root.internal->incremental_interface->object, &glyph_data ); /* Set the control data to null - it is no longer available if */ /* loaded incrementally. */ t1glyph->control_data = NULL; t1glyph->control_len = 0; } #endif if ( must_finish_decoder ) decoder_funcs->done( &decoder ); return error; } /* END */