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