/***************************************************************************/ /* */ /* cffgload.c */ /* */ /* OpenType Glyph Loader (body). */ /* */ /* Copyright 1996-2015 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 #include #include #include #include FT_OUTLINE_H #include FT_CFF_DRIVER_H #include "cffobjs.h" #include "cffload.h" #include "cffgload.h" #include "cf2ft.h" /* for cf2_decoder_parse_charstrings */ #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 trace_cffgload #ifdef CFF_CONFIG_OPTION_OLD_ENGINE typedef enum CFF_Operator_ { cff_op_unknown = 0, cff_op_rmoveto, cff_op_hmoveto, cff_op_vmoveto, cff_op_rlineto, cff_op_hlineto, cff_op_vlineto, cff_op_rrcurveto, cff_op_hhcurveto, cff_op_hvcurveto, cff_op_rcurveline, cff_op_rlinecurve, cff_op_vhcurveto, cff_op_vvcurveto, cff_op_flex, cff_op_hflex, cff_op_hflex1, cff_op_flex1, cff_op_endchar, cff_op_hstem, cff_op_vstem, cff_op_hstemhm, cff_op_vstemhm, cff_op_hintmask, cff_op_cntrmask, cff_op_dotsection, /* deprecated, acts as no-op */ cff_op_abs, cff_op_add, cff_op_sub, cff_op_div, cff_op_neg, cff_op_random, cff_op_mul, cff_op_sqrt, cff_op_blend, cff_op_drop, cff_op_exch, cff_op_index, cff_op_roll, cff_op_dup, cff_op_put, cff_op_get, cff_op_store, cff_op_load, cff_op_and, cff_op_or, cff_op_not, cff_op_eq, cff_op_ifelse, cff_op_callsubr, cff_op_callgsubr, cff_op_return, /* Type 1 opcodes: invalid but seen in real life */ cff_op_hsbw, cff_op_closepath, cff_op_callothersubr, cff_op_pop, cff_op_seac, cff_op_sbw, cff_op_setcurrentpoint, /* do not remove */ cff_op_max } CFF_Operator; #define CFF_COUNT_CHECK_WIDTH 0x80 #define CFF_COUNT_EXACT 0x40 #define CFF_COUNT_CLEAR_STACK 0x20 /* count values which have the `CFF_COUNT_CHECK_WIDTH' flag set are */ /* used for checking the width and requested numbers of arguments */ /* only; they are set to zero afterwards */ /* the other two flags are informative only and unused currently */ static const FT_Byte cff_argument_counts[] = { 0, /* unknown */ 2 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, /* rmoveto */ 1 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, 1 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, 0 | CFF_COUNT_CLEAR_STACK, /* rlineto */ 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, /* rrcurveto */ 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, 0 | CFF_COUNT_CLEAR_STACK, 13, /* flex */ 7, 9, 11, 0 | CFF_COUNT_CHECK_WIDTH, /* endchar */ 2 | CFF_COUNT_CHECK_WIDTH, /* hstem */ 2 | CFF_COUNT_CHECK_WIDTH, 2 | CFF_COUNT_CHECK_WIDTH, 2 | CFF_COUNT_CHECK_WIDTH, 0 | CFF_COUNT_CHECK_WIDTH, /* hintmask */ 0 | CFF_COUNT_CHECK_WIDTH, /* cntrmask */ 0, /* dotsection */ 1, /* abs */ 2, 2, 2, 1, 0, 2, 1, 1, /* blend */ 1, /* drop */ 2, 1, 2, 1, 2, /* put */ 1, 4, 3, 2, /* and */ 2, 1, 2, 4, 1, /* callsubr */ 1, 0, 2, /* hsbw */ 0, 0, 0, 5, /* seac */ 4, /* sbw */ 2 /* setcurrentpoint */ }; #endif /* CFF_CONFIG_OPTION_OLD_ENGINE */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** *********/ /********** GENERIC CHARSTRING PARSING *********/ /********** *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* cff_builder_init */ /* */ /* */ /* Initializes a given glyph builder. */ /* */ /* */ /* builder :: A pointer to the glyph builder to initialize. */ /* */ /* */ /* face :: The current face object. */ /* */ /* size :: The current size object. */ /* */ /* glyph :: The current glyph object. */ /* */ /* hinting :: Whether hinting is active. */ /* */ static void cff_builder_init( CFF_Builder* builder, TT_Face face, CFF_Size size, CFF_GlyphSlot glyph, FT_Bool hinting ) { builder->path_begun = 0; builder->load_points = 1; builder->face = face; builder->glyph = glyph; builder->memory = face->root.memory; if ( glyph ) { FT_GlyphLoader loader = glyph->root.internal->loader; builder->loader = loader; builder->base = &loader->base.outline; builder->current = &loader->current.outline; FT_GlyphLoader_Rewind( loader ); builder->hints_globals = NULL; builder->hints_funcs = NULL; if ( hinting && size ) { CFF_Internal internal = (CFF_Internal)size->root.internal; builder->hints_globals = (void *)internal->topfont; builder->hints_funcs = glyph->root.internal->glyph_hints; } } builder->pos_x = 0; builder->pos_y = 0; builder->left_bearing.x = 0; builder->left_bearing.y = 0; builder->advance.x = 0; builder->advance.y = 0; } /*************************************************************************/ /* */ /* */ /* cff_builder_done */ /* */ /* */ /* Finalizes a given glyph builder. Its contents can still be used */ /* after the call, but the function saves important information */ /* within the corresponding glyph slot. */ /* */ /* */ /* builder :: A pointer to the glyph builder to finalize. */ /* */ static void cff_builder_done( CFF_Builder* builder ) { CFF_GlyphSlot glyph = builder->glyph; if ( glyph ) glyph->root.outline = *builder->base; } /*************************************************************************/ /* */ /* */ /* cff_compute_bias */ /* */ /* */ /* Computes the bias value in dependence of the number of glyph */ /* subroutines. */ /* */ /* */ /* in_charstring_type :: The `CharstringType' value of the top DICT */ /* dictionary. */ /* */ /* num_subrs :: The number of glyph subroutines. */ /* */ /* */ /* The bias value. */ static FT_Int cff_compute_bias( FT_Int in_charstring_type, FT_UInt num_subrs ) { FT_Int result; if ( in_charstring_type == 1 ) result = 0; else if ( num_subrs < 1240 ) result = 107; else if ( num_subrs < 33900U ) result = 1131; else result = 32768U; return result; } /*************************************************************************/ /* */ /* */ /* cff_decoder_init */ /* */ /* */ /* Initializes a given glyph decoder. */ /* */ /* */ /* decoder :: A pointer to the glyph builder to initialize. */ /* */ /* */ /* face :: The current face object. */ /* */ /* size :: The current size object. */ /* */ /* slot :: The current glyph object. */ /* */ /* hinting :: Whether hinting is active. */ /* */ /* hint_mode :: The hinting mode. */ /* */ FT_LOCAL_DEF( void ) cff_decoder_init( CFF_Decoder* decoder, TT_Face face, CFF_Size size, CFF_GlyphSlot slot, FT_Bool hinting, FT_Render_Mode hint_mode ) { CFF_Font cff = (CFF_Font)face->extra.data; /* clear everything */ FT_MEM_ZERO( decoder, sizeof ( *decoder ) ); /* initialize builder */ cff_builder_init( &decoder->builder, face, size, slot, hinting ); /* initialize Type2 decoder */ decoder->cff = cff; decoder->num_globals = cff->global_subrs_index.count; decoder->globals = cff->global_subrs; decoder->globals_bias = cff_compute_bias( cff->top_font.font_dict.charstring_type, decoder->num_globals ); decoder->hint_mode = hint_mode; } /* this function is used to select the subfont */ /* and the locals subrs array */ FT_LOCAL_DEF( FT_Error ) cff_decoder_prepare( CFF_Decoder* decoder, CFF_Size size, FT_UInt glyph_index ) { CFF_Builder *builder = &decoder->builder; CFF_Font cff = (CFF_Font)builder->face->extra.data; CFF_SubFont sub = &cff->top_font; FT_Error error = FT_Err_Ok; /* manage CID fonts */ if ( cff->num_subfonts ) { FT_Byte fd_index = cff_fd_select_get( &cff->fd_select, glyph_index ); if ( fd_index >= cff->num_subfonts ) { FT_TRACE4(( "cff_decoder_prepare: invalid CID subfont index\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } FT_TRACE3(( " in subfont %d:\n", fd_index )); sub = cff->subfonts[fd_index]; if ( builder->hints_funcs && size ) { CFF_Internal internal = (CFF_Internal)size->root.internal; /* for CFFs without subfonts, this value has already been set */ builder->hints_globals = (void *)internal->subfonts[fd_index]; } } decoder->num_locals = sub->local_subrs_index.count; decoder->locals = sub->local_subrs; decoder->locals_bias = cff_compute_bias( decoder->cff->top_font.font_dict.charstring_type, decoder->num_locals ); decoder->glyph_width = sub->private_dict.default_width; decoder->nominal_width = sub->private_dict.nominal_width; decoder->current_subfont = sub; /* for Adobe's CFF handler */ Exit: return error; } /* check that there is enough space for `count' more points */ FT_LOCAL_DEF( FT_Error ) cff_check_points( CFF_Builder* builder, FT_Int count ) { return FT_GLYPHLOADER_CHECK_POINTS( builder->loader, count, 0 ); } /* add a new point, do not check space */ FT_LOCAL_DEF( void ) cff_builder_add_point( CFF_Builder* builder, FT_Pos x, FT_Pos y, FT_Byte flag ) { FT_Outline* outline = builder->current; if ( builder->load_points ) { FT_Vector* point = outline->points + outline->n_points; FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points; #ifdef CFF_CONFIG_OPTION_OLD_ENGINE CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( builder->face ); if ( driver->hinting_engine == FT_CFF_HINTING_FREETYPE ) { point->x = x >> 16; point->y = y >> 16; } else #endif { /* cf2_decoder_parse_charstrings uses 16.16 coordinates */ point->x = x >> 10; point->y = y >> 10; } *control = (FT_Byte)( flag ? FT_CURVE_TAG_ON : FT_CURVE_TAG_CUBIC ); } outline->n_points++; } /* check space for a new on-curve point, then add it */ FT_LOCAL_DEF( FT_Error ) cff_builder_add_point1( CFF_Builder* builder, FT_Pos x, FT_Pos y ) { FT_Error error; error = cff_check_points( builder, 1 ); if ( !error ) cff_builder_add_point( builder, x, y, 1 ); return error; } /* check space for a new contour, then add it */ static FT_Error cff_builder_add_contour( CFF_Builder* builder ) { FT_Outline* outline = builder->current; FT_Error error; if ( !builder->load_points ) { outline->n_contours++; return FT_Err_Ok; } error = FT_GLYPHLOADER_CHECK_POINTS( builder->loader, 0, 1 ); if ( !error ) { if ( outline->n_contours > 0 ) outline->contours[outline->n_contours - 1] = (short)( outline->n_points - 1 ); outline->n_contours++; } return error; } /* if a path was begun, add its first on-curve point */ FT_LOCAL_DEF( FT_Error ) cff_builder_start_point( CFF_Builder* builder, FT_Pos x, FT_Pos y ) { FT_Error error = FT_Err_Ok; /* test whether we are building a new contour */ if ( !builder->path_begun ) { builder->path_begun = 1; error = cff_builder_add_contour( builder ); if ( !error ) error = cff_builder_add_point1( builder, x, y ); } return error; } /* close the current contour */ FT_LOCAL_DEF( void ) cff_builder_close_contour( CFF_Builder* builder ) { FT_Outline* outline = builder->current; FT_Int first; if ( !outline ) return; first = outline->n_contours <= 1 ? 0 : outline->contours[outline->n_contours - 2] + 1; /* We must not include the last point in the path if it */ /* is located on the first point. */ if ( outline->n_points > 1 ) { FT_Vector* p1 = outline->points + first; FT_Vector* p2 = outline->points + outline->n_points - 1; FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points - 1; /* `delete' last point only if it coincides with the first */ /* point and if it is not a control point (which can happen). */ if ( p1->x == p2->x && p1->y == p2->y ) if ( *control == FT_CURVE_TAG_ON ) outline->n_points--; } if ( outline->n_contours > 0 ) { /* Don't add contours only consisting of one point, i.e., */ /* check whether begin point and last point are the same. */ if ( first == outline->n_points - 1 ) { outline->n_contours--; outline->n_points--; } else outline->contours[outline->n_contours - 1] = (short)( outline->n_points - 1 ); } } FT_LOCAL_DEF( FT_Int ) cff_lookup_glyph_by_stdcharcode( CFF_Font cff, FT_Int charcode ) { FT_UInt n; FT_UShort glyph_sid; /* CID-keyed fonts don't have glyph names */ if ( !cff->charset.sids ) return -1; /* check range of standard char code */ if ( charcode < 0 || charcode > 255 ) return -1; /* Get code to SID mapping from `cff_standard_encoding'. */ glyph_sid = cff_get_standard_encoding( (FT_UInt)charcode ); for ( n = 0; n < cff->num_glyphs; n++ ) { if ( cff->charset.sids[n] == glyph_sid ) return (FT_Int)n; } return -1; } 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 ); } } #ifdef CFF_CONFIG_OPTION_OLD_ENGINE static FT_Error cff_operator_seac( CFF_Decoder* decoder, FT_Pos asb, FT_Pos adx, FT_Pos ady, FT_Int bchar, FT_Int achar ) { FT_Error error; CFF_Builder* builder = &decoder->builder; FT_Int bchar_index, achar_index; TT_Face face = decoder->builder.face; FT_Vector left_bearing, advance; FT_Byte* charstring; FT_ULong charstring_len; FT_Pos glyph_width; if ( decoder->seac ) { FT_ERROR(( "cff_operator_seac: invalid nested seac\n" )); return FT_THROW( Syntax_Error ); } adx += decoder->builder.left_bearing.x; ady += decoder->builder.left_bearing.y; #ifdef FT_CONFIG_OPTION_INCREMENTAL /* Incremental fonts don't necessarily have valid charsets. */ /* They use the character code, not the glyph index, in this case. */ if ( face->root.internal->incremental_interface ) { bchar_index = bchar; achar_index = achar; } else #endif /* FT_CONFIG_OPTION_INCREMENTAL */ { CFF_Font cff = (CFF_Font)(face->extra.data); bchar_index = cff_lookup_glyph_by_stdcharcode( cff, bchar ); achar_index = cff_lookup_glyph_by_stdcharcode( cff, achar ); } if ( bchar_index < 0 || achar_index < 0 ) { FT_ERROR(( "cff_operator_seac:" " invalid seac character code arguments\n" )); return FT_THROW( Syntax_Error ); } /* If we are trying to load a composite glyph, do not load the */ /* accent character and return the array of subglyphs. */ if ( builder->no_recurse ) { FT_GlyphSlot glyph = (FT_GlyphSlot)builder->glyph; FT_GlyphLoader loader = glyph->internal->loader; FT_SubGlyph subg; /* reallocate subglyph array if necessary */ error = FT_GlyphLoader_CheckSubGlyphs( loader, 2 ); if ( error ) goto Exit; subg = loader->current.subglyphs; /* subglyph 0 = base character */ subg->index = bchar_index; subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES | FT_SUBGLYPH_FLAG_USE_MY_METRICS; subg->arg1 = 0; subg->arg2 = 0; subg++; /* subglyph 1 = accent character */ subg->index = achar_index; subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES; subg->arg1 = (FT_Int)( adx >> 16 ); subg->arg2 = (FT_Int)( ady >> 16 ); /* set up remaining glyph fields */ glyph->num_subglyphs = 2; glyph->subglyphs = loader->base.subglyphs; glyph->format = FT_GLYPH_FORMAT_COMPOSITE; loader->current.num_subglyphs = 2; } FT_GlyphLoader_Prepare( builder->loader ); /* First load `bchar' in builder */ error = cff_get_glyph_data( face, (FT_UInt)bchar_index, &charstring, &charstring_len ); if ( !error ) { /* the seac operator must not be nested */ decoder->seac = TRUE; error = cff_decoder_parse_charstrings( decoder, charstring, charstring_len ); decoder->seac = FALSE; cff_free_glyph_data( face, &charstring, charstring_len ); if ( error ) goto Exit; } /* Save the left bearing, advance and glyph width of the base */ /* character as they will be erased by the next load. */ left_bearing = builder->left_bearing; advance = builder->advance; glyph_width = decoder->glyph_width; builder->left_bearing.x = 0; builder->left_bearing.y = 0; builder->pos_x = adx - asb; builder->pos_y = ady; /* Now load `achar' on top of the base outline. */ error = cff_get_glyph_data( face, (FT_UInt)achar_index, &charstring, &charstring_len ); if ( !error ) { /* the seac operator must not be nested */ decoder->seac = TRUE; error = cff_decoder_parse_charstrings( decoder, charstring, charstring_len ); decoder->seac = FALSE; cff_free_glyph_data( face, &charstring, charstring_len ); if ( error ) goto Exit; } /* Restore the left side bearing, advance and glyph width */ /* of the base character. */ builder->left_bearing = left_bearing; builder->advance = advance; decoder->glyph_width = glyph_width; builder->pos_x = 0; builder->pos_y = 0; Exit: return error; } /*************************************************************************/ /* */ /* */ /* cff_decoder_parse_charstrings */ /* */ /* */ /* Parses a given Type 2 charstrings program. */ /* */ /* */ /* decoder :: The current Type 1 decoder. */ /* */ /* */ /* charstring_base :: The base of the charstring stream. */ /* */ /* charstring_len :: The length in bytes of the charstring stream. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) cff_decoder_parse_charstrings( CFF_Decoder* decoder, FT_Byte* charstring_base, FT_ULong charstring_len ) { FT_Error error; CFF_Decoder_Zone* zone; FT_Byte* ip; FT_Byte* limit; CFF_Builder* builder = &decoder->builder; FT_Pos x, y; FT_Fixed seed; FT_Fixed* stack; FT_Int charstring_type = decoder->cff->top_font.font_dict.charstring_type; T2_Hints_Funcs hinter; /* set default width */ decoder->num_hints = 0; decoder->read_width = 1; /* compute random seed from stack address of parameter */ seed = (FT_Fixed)( ( (FT_Offset)(char*)&seed ^ (FT_Offset)(char*)&decoder ^ (FT_Offset)(char*)&charstring_base ) & FT_ULONG_MAX ); seed = ( seed ^ ( seed >> 10 ) ^ ( seed >> 20 ) ) & 0xFFFFL; if ( seed == 0 ) seed = 0x7384; /* initialize the decoder */ decoder->top = decoder->stack; decoder->zone = decoder->zones; zone = decoder->zones; stack = decoder->top; hinter = (T2_Hints_Funcs)builder->hints_funcs; builder->path_begun = 0; zone->base = charstring_base; limit = zone->limit = charstring_base + charstring_len; ip = zone->cursor = zone->base; error = FT_Err_Ok; x = builder->pos_x; y = builder->pos_y; /* begin hints recording session, if any */ if ( hinter ) hinter->open( hinter->hints ); /* now execute loop */ while ( ip < limit ) { CFF_Operator op; FT_Byte v; /********************************************************************/ /* */ /* Decode operator or operand */ /* */ v = *ip++; if ( v >= 32 || v == 28 ) { FT_Int shift = 16; FT_Int32 val; /* this is an operand, push it on the stack */ /* if we use shifts, all computations are done with unsigned */ /* values; the conversion to a signed value is the last step */ if ( v == 28 ) { if ( ip + 1 >= limit ) goto Syntax_Error; val = (FT_Short)( ( (FT_UShort)ip[0] << 8 ) | ip[1] ); ip += 2; } else if ( v < 247 ) val = (FT_Int32)v - 139; else if ( v < 251 ) { if ( ip >= limit ) goto Syntax_Error; val = ( (FT_Int32)v - 247 ) * 256 + *ip++ + 108; } else if ( v < 255 ) { if ( ip >= limit ) goto Syntax_Error; val = -( (FT_Int32)v - 251 ) * 256 - *ip++ - 108; } else { if ( ip + 3 >= limit ) goto Syntax_Error; val = (FT_Int32)( ( (FT_UInt32)ip[0] << 24 ) | ( (FT_UInt32)ip[1] << 16 ) | ( (FT_UInt32)ip[2] << 8 ) | (FT_UInt32)ip[3] ); ip += 4; if ( charstring_type == 2 ) shift = 0; } if ( decoder->top - stack >= CFF_MAX_OPERANDS ) goto Stack_Overflow; val = (FT_Int32)( (FT_UInt32)val << shift ); *decoder->top++ = val; #ifdef FT_DEBUG_LEVEL_TRACE if ( !( val & 0xFFFFL ) ) FT_TRACE4(( " %hd", (FT_Short)( (FT_UInt32)val >> 16 ) )); else FT_TRACE4(( " %.2f", val / 65536.0 )); #endif } else { /* The specification says that normally arguments are to be taken */ /* from the bottom of the stack. However, this seems not to be */ /* correct, at least for Acroread 7.0.8 on GNU/Linux: It pops the */ /* arguments similar to a PS interpreter. */ FT_Fixed* args = decoder->top; FT_Int num_args = (FT_Int)( args - decoder->stack ); FT_Int req_args; /* find operator */ op = cff_op_unknown; switch ( v ) { case 1: op = cff_op_hstem; break; case 3: op = cff_op_vstem; break; case 4: op = cff_op_vmoveto; break; case 5: op = cff_op_rlineto; break; case 6: op = cff_op_hlineto; break; case 7: op = cff_op_vlineto; break; case 8: op = cff_op_rrcurveto; break; case 9: op = cff_op_closepath; break; case 10: op = cff_op_callsubr; break; case 11: op = cff_op_return; break; case 12: { if ( ip >= limit ) goto Syntax_Error; v = *ip++; switch ( v ) { case 0: op = cff_op_dotsection; break; case 1: /* this is actually the Type1 vstem3 operator */ op = cff_op_vstem; break; case 2: /* this is actually the Type1 hstem3 operator */ op = cff_op_hstem; break; case 3: op = cff_op_and; break; case 4: op = cff_op_or; break; case 5: op = cff_op_not; break; case 6: op = cff_op_seac; break; case 7: op = cff_op_sbw; break; case 8: op = cff_op_store; break; case 9: op = cff_op_abs; break; case 10: op = cff_op_add; break; case 11: op = cff_op_sub; break; case 12: op = cff_op_div; break; case 13: op = cff_op_load; break; case 14: op = cff_op_neg; break; case 15: op = cff_op_eq; break; case 16: op = cff_op_callothersubr; break; case 17: op = cff_op_pop; break; case 18: op = cff_op_drop; break; case 20: op = cff_op_put; break; case 21: op = cff_op_get; break; case 22: op = cff_op_ifelse; break; case 23: op = cff_op_random; break; case 24: op = cff_op_mul; break; case 26: op = cff_op_sqrt; break; case 27: op = cff_op_dup; break; case 28: op = cff_op_exch; break; case 29: op = cff_op_index; break; case 30: op = cff_op_roll; break; case 33: op = cff_op_setcurrentpoint; break; case 34: op = cff_op_hflex; break; case 35: op = cff_op_flex; break; case 36: op = cff_op_hflex1; break; case 37: op = cff_op_flex1; break; default: FT_TRACE4(( " unknown op (12, %d)\n", v )); break; } } break; case 13: op = cff_op_hsbw; break; case 14: op = cff_op_endchar; break; case 16: op = cff_op_blend; break; case 18: op = cff_op_hstemhm; break; case 19: op = cff_op_hintmask; break; case 20: op = cff_op_cntrmask; break; case 21: op = cff_op_rmoveto; break; case 22: op = cff_op_hmoveto; break; case 23: op = cff_op_vstemhm; break; case 24: op = cff_op_rcurveline; break; case 25: op = cff_op_rlinecurve; break; case 26: op = cff_op_vvcurveto; break; case 27: op = cff_op_hhcurveto; break; case 29: op = cff_op_callgsubr; break; case 30: op = cff_op_vhcurveto; break; case 31: op = cff_op_hvcurveto; break; default: FT_TRACE4(( " unknown op (%d)\n", v )); break; } if ( op == cff_op_unknown ) continue; /* check arguments */ req_args = cff_argument_counts[op]; if ( req_args & CFF_COUNT_CHECK_WIDTH ) { if ( num_args > 0 && decoder->read_width ) { /* If `nominal_width' is non-zero, the number is really a */ /* difference against `nominal_width'. Else, the number here */ /* is truly a width, not a difference against `nominal_width'. */ /* If the font does not set `nominal_width', then */ /* `nominal_width' defaults to zero, and so we can set */ /* `glyph_width' to `nominal_width' plus number on the stack */ /* -- for either case. */ FT_Int set_width_ok; switch ( op ) { case cff_op_hmoveto: case cff_op_vmoveto: set_width_ok = num_args & 2; break; case cff_op_hstem: case cff_op_vstem: case cff_op_hstemhm: case cff_op_vstemhm: case cff_op_rmoveto: case cff_op_hintmask: case cff_op_cntrmask: set_width_ok = num_args & 1; break; case cff_op_endchar: /* If there is a width specified for endchar, we either have */ /* 1 argument or 5 arguments. We like to argue. */ set_width_ok = ( num_args == 5 ) || ( num_args == 1 ); break; default: set_width_ok = 0; break; } if ( set_width_ok ) { decoder->glyph_width = decoder->nominal_width + ( stack[0] >> 16 ); if ( decoder->width_only ) { /* we only want the advance width; stop here */ break; } /* Consumed an argument. */ num_args--; } } decoder->read_width = 0; req_args = 0; } req_args &= 0x000F; if ( num_args < req_args ) goto Stack_Underflow; args -= req_args; num_args -= req_args; /* At this point, `args' points to the first argument of the */ /* operand in case `req_args' isn't zero. Otherwise, we have */ /* to adjust `args' manually. */ /* Note that we only pop arguments from the stack which we */ /* really need and can digest so that we can continue in case */ /* of superfluous stack elements. */ switch ( op ) { case cff_op_hstem: case cff_op_vstem: case cff_op_hstemhm: case cff_op_vstemhm: /* the number of arguments is always even here */ FT_TRACE4(( op == cff_op_hstem ? " hstem\n" : ( op == cff_op_vstem ? " vstem\n" : ( op == cff_op_hstemhm ? " hstemhm\n" : " vstemhm\n" ) ) )); if ( hinter ) hinter->stems( hinter->hints, ( op == cff_op_hstem || op == cff_op_hstemhm ), num_args / 2, args - ( num_args & ~1 ) ); decoder->num_hints += num_args / 2; args = stack; break; case cff_op_hintmask: case cff_op_cntrmask: FT_TRACE4(( op == cff_op_hintmask ? " hintmask" : " cntrmask" )); /* implement vstem when needed -- */ /* the specification doesn't say it, but this also works */ /* with the 'cntrmask' operator */ /* */ if ( num_args > 0 ) { if ( hinter ) hinter->stems( hinter->hints, 0, num_args / 2, args - ( num_args & ~1 ) ); decoder->num_hints += num_args / 2; } /* In a valid charstring there must be at least one byte */ /* after `hintmask' or `cntrmask' (e.g., for a `return' */ /* instruction). Additionally, there must be space for */ /* `num_hints' bits. */ if ( ( ip + ( ( decoder->num_hints + 7 ) >> 3 ) ) >= limit ) goto Syntax_Error; if ( hinter ) { if ( op == cff_op_hintmask ) hinter->hintmask( hinter->hints, (FT_UInt)builder->current->n_points, (FT_UInt)decoder->num_hints, ip ); else hinter->counter( hinter->hints, (FT_UInt)decoder->num_hints, ip ); } #ifdef FT_DEBUG_LEVEL_TRACE { FT_UInt maskbyte; FT_TRACE4(( " (maskbytes:" )); for ( maskbyte = 0; maskbyte < (FT_UInt)( ( decoder->num_hints + 7 ) >> 3 ); maskbyte++, ip++ ) FT_TRACE4(( " 0x%02X", *ip )); FT_TRACE4(( ")\n" )); } #else ip += ( decoder->num_hints + 7 ) >> 3; #endif args = stack; break; case cff_op_rmoveto: FT_TRACE4(( " rmoveto\n" )); cff_builder_close_contour( builder ); builder->path_begun = 0; x += args[-2]; y += args[-1]; args = stack; break; case cff_op_vmoveto: FT_TRACE4(( " vmoveto\n" )); cff_builder_close_contour( builder ); builder->path_begun = 0; y += args[-1]; args = stack; break; case cff_op_hmoveto: FT_TRACE4(( " hmoveto\n" )); cff_builder_close_contour( builder ); builder->path_begun = 0; x += args[-1]; args = stack; break; case cff_op_rlineto: FT_TRACE4(( " rlineto\n" )); if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, num_args / 2 ) ) goto Fail; if ( num_args < 2 ) goto Stack_Underflow; args -= num_args & ~1; while ( args < decoder->top ) { x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 1 ); args += 2; } args = stack; break; case cff_op_hlineto: case cff_op_vlineto: { FT_Int phase = ( op == cff_op_hlineto ); FT_TRACE4(( op == cff_op_hlineto ? " hlineto\n" : " vlineto\n" )); if ( num_args < 0 ) goto Stack_Underflow; /* there exist subsetted fonts (found in PDFs) */ /* which call `hlineto' without arguments */ if ( num_args == 0 ) break; if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, num_args ) ) goto Fail; args = stack; while ( args < decoder->top ) { if ( phase ) x += args[0]; else y += args[0]; if ( cff_builder_add_point1( builder, x, y ) ) goto Fail; args++; phase ^= 1; } args = stack; } break; case cff_op_rrcurveto: { FT_Int nargs; FT_TRACE4(( " rrcurveto\n" )); if ( num_args < 6 ) goto Stack_Underflow; nargs = num_args - num_args % 6; if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, nargs / 2 ) ) goto Fail; args -= nargs; while ( args < decoder->top ) { x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 0 ); x += args[2]; y += args[3]; cff_builder_add_point( builder, x, y, 0 ); x += args[4]; y += args[5]; cff_builder_add_point( builder, x, y, 1 ); args += 6; } args = stack; } break; case cff_op_vvcurveto: { FT_Int nargs; FT_TRACE4(( " vvcurveto\n" )); if ( num_args < 4 ) goto Stack_Underflow; /* if num_args isn't of the form 4n or 4n+1, */ /* we enforce it by clearing the second bit */ nargs = num_args & ~2; if ( cff_builder_start_point( builder, x, y ) ) goto Fail; args -= nargs; if ( nargs & 1 ) { x += args[0]; args++; nargs--; } if ( cff_check_points( builder, 3 * ( nargs / 4 ) ) ) goto Fail; while ( args < decoder->top ) { y += args[0]; cff_builder_add_point( builder, x, y, 0 ); x += args[1]; y += args[2]; cff_builder_add_point( builder, x, y, 0 ); y += args[3]; cff_builder_add_point( builder, x, y, 1 ); args += 4; } args = stack; } break; case cff_op_hhcurveto: { FT_Int nargs; FT_TRACE4(( " hhcurveto\n" )); if ( num_args < 4 ) goto Stack_Underflow; /* if num_args isn't of the form 4n or 4n+1, */ /* we enforce it by clearing the second bit */ nargs = num_args & ~2; if ( cff_builder_start_point( builder, x, y ) ) goto Fail; args -= nargs; if ( nargs & 1 ) { y += args[0]; args++; nargs--; } if ( cff_check_points( builder, 3 * ( nargs / 4 ) ) ) goto Fail; while ( args < decoder->top ) { x += args[0]; cff_builder_add_point( builder, x, y, 0 ); x += args[1]; y += args[2]; cff_builder_add_point( builder, x, y, 0 ); x += args[3]; cff_builder_add_point( builder, x, y, 1 ); args += 4; } args = stack; } break; case cff_op_vhcurveto: case cff_op_hvcurveto: { FT_Int phase; FT_Int nargs; FT_TRACE4(( op == cff_op_vhcurveto ? " vhcurveto\n" : " hvcurveto\n" )); if ( cff_builder_start_point( builder, x, y ) ) goto Fail; if ( num_args < 4 ) goto Stack_Underflow; /* if num_args isn't of the form 8n, 8n+1, 8n+4, or 8n+5, */ /* we enforce it by clearing the second bit */ nargs = num_args & ~2; args -= nargs; if ( cff_check_points( builder, ( nargs / 4 ) * 3 ) ) goto Stack_Underflow; phase = ( op == cff_op_hvcurveto ); while ( nargs >= 4 ) { nargs -= 4; if ( phase ) { x += args[0]; cff_builder_add_point( builder, x, y, 0 ); x += args[1]; y += args[2]; cff_builder_add_point( builder, x, y, 0 ); y += args[3]; if ( nargs == 1 ) x += args[4]; cff_builder_add_point( builder, x, y, 1 ); } else { y += args[0]; cff_builder_add_point( builder, x, y, 0 ); x += args[1]; y += args[2]; cff_builder_add_point( builder, x, y, 0 ); x += args[3]; if ( nargs == 1 ) y += args[4]; cff_builder_add_point( builder, x, y, 1 ); } args += 4; phase ^= 1; } args = stack; } break; case cff_op_rlinecurve: { FT_Int num_lines; FT_Int nargs; FT_TRACE4(( " rlinecurve\n" )); if ( num_args < 8 ) goto Stack_Underflow; nargs = num_args & ~1; num_lines = ( nargs - 6 ) / 2; if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, num_lines + 3 ) ) goto Fail; args -= nargs; /* first, add the line segments */ while ( num_lines > 0 ) { x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 1 ); args += 2; num_lines--; } /* then the curve */ x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 0 ); x += args[2]; y += args[3]; cff_builder_add_point( builder, x, y, 0 ); x += args[4]; y += args[5]; cff_builder_add_point( builder, x, y, 1 ); args = stack; } break; case cff_op_rcurveline: { FT_Int num_curves; FT_Int nargs; FT_TRACE4(( " rcurveline\n" )); if ( num_args < 8 ) goto Stack_Underflow; nargs = num_args - 2; nargs = nargs - nargs % 6 + 2; num_curves = ( nargs - 2 ) / 6; if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, num_curves * 3 + 2 ) ) goto Fail; args -= nargs; /* first, add the curves */ while ( num_curves > 0 ) { x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 0 ); x += args[2]; y += args[3]; cff_builder_add_point( builder, x, y, 0 ); x += args[4]; y += args[5]; cff_builder_add_point( builder, x, y, 1 ); args += 6; num_curves--; } /* then the final line */ x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 1 ); args = stack; } break; case cff_op_hflex1: { FT_Pos start_y; FT_TRACE4(( " hflex1\n" )); /* adding five more points: 4 control points, 1 on-curve point */ /* -- make sure we have enough space for the start point if it */ /* needs to be added */ if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, 6 ) ) goto Fail; /* record the starting point's y position for later use */ start_y = y; /* first control point */ x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, 0 ); /* second control point */ x += args[2]; y += args[3]; cff_builder_add_point( builder, x, y, 0 ); /* join point; on curve, with y-value the same as the last */ /* control point's y-value */ x += args[4]; cff_builder_add_point( builder, x, y, 1 ); /* third control point, with y-value the same as the join */ /* point's y-value */ x += args[5]; cff_builder_add_point( builder, x, y, 0 ); /* fourth control point */ x += args[6]; y += args[7]; cff_builder_add_point( builder, x, y, 0 ); /* ending point, with y-value the same as the start */ x += args[8]; y = start_y; cff_builder_add_point( builder, x, y, 1 ); args = stack; break; } case cff_op_hflex: { FT_Pos start_y; FT_TRACE4(( " hflex\n" )); /* adding six more points; 4 control points, 2 on-curve points */ if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, 6 ) ) goto Fail; /* record the starting point's y-position for later use */ start_y = y; /* first control point */ x += args[0]; cff_builder_add_point( builder, x, y, 0 ); /* second control point */ x += args[1]; y += args[2]; cff_builder_add_point( builder, x, y, 0 ); /* join point; on curve, with y-value the same as the last */ /* control point's y-value */ x += args[3]; cff_builder_add_point( builder, x, y, 1 ); /* third control point, with y-value the same as the join */ /* point's y-value */ x += args[4]; cff_builder_add_point( builder, x, y, 0 ); /* fourth control point */ x += args[5]; y = start_y; cff_builder_add_point( builder, x, y, 0 ); /* ending point, with y-value the same as the start point's */ /* y-value -- we don't add this point, though */ x += args[6]; cff_builder_add_point( builder, x, y, 1 ); args = stack; break; } case cff_op_flex1: { FT_Pos start_x, start_y; /* record start x, y values for */ /* alter use */ FT_Fixed dx = 0, dy = 0; /* used in horizontal/vertical */ /* algorithm below */ FT_Int horizontal, count; FT_Fixed* temp; FT_TRACE4(( " flex1\n" )); /* adding six more points; 4 control points, 2 on-curve points */ if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, 6 ) ) goto Fail; /* record the starting point's x, y position for later use */ start_x = x; start_y = y; /* XXX: figure out whether this is supposed to be a horizontal */ /* or vertical flex; the Type 2 specification is vague... */ temp = args; /* grab up to the last argument */ for ( count = 5; count > 0; count-- ) { dx += temp[0]; dy += temp[1]; temp += 2; } if ( dx < 0 ) dx = -dx; if ( dy < 0 ) dy = -dy; /* strange test, but here it is... */ horizontal = ( dx > dy ); for ( count = 5; count > 0; count-- ) { x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, (FT_Bool)( count == 3 ) ); args += 2; } /* is last operand an x- or y-delta? */ if ( horizontal ) { x += args[0]; y = start_y; } else { x = start_x; y += args[0]; } cff_builder_add_point( builder, x, y, 1 ); args = stack; break; } case cff_op_flex: { FT_UInt count; FT_TRACE4(( " flex\n" )); if ( cff_builder_start_point( builder, x, y ) || cff_check_points( builder, 6 ) ) goto Fail; for ( count = 6; count > 0; count-- ) { x += args[0]; y += args[1]; cff_builder_add_point( builder, x, y, (FT_Bool)( count == 4 || count == 1 ) ); args += 2; } args = stack; } break; case cff_op_seac: FT_TRACE4(( " seac\n" )); error = cff_operator_seac( decoder, args[0], args[1], args[2], (FT_Int)( args[3] >> 16 ), (FT_Int)( args[4] >> 16 ) ); /* add current outline to the glyph slot */ FT_GlyphLoader_Add( builder->loader ); /* return now! */ FT_TRACE4(( "\n" )); return error; case cff_op_endchar: FT_TRACE4(( " endchar\n" )); /* We are going to emulate the seac operator. */ if ( num_args >= 4 ) { /* Save glyph width so that the subglyphs don't overwrite it. */ FT_Pos glyph_width = decoder->glyph_width; error = cff_operator_seac( decoder, 0L, args[-4], args[-3], (FT_Int)( args[-2] >> 16 ), (FT_Int)( args[-1] >> 16 ) ); decoder->glyph_width = glyph_width; } else { cff_builder_close_contour( builder ); /* close hints recording session */ if ( hinter ) { if ( hinter->close( hinter->hints, (FT_UInt)builder->current->n_points ) ) goto Syntax_Error; /* apply hints to the loaded glyph outline now */ error = hinter->apply( hinter->hints, builder->current, (PSH_Globals)builder->hints_globals, decoder->hint_mode ); if ( error ) goto Fail; } /* add current outline to the glyph slot */ FT_GlyphLoader_Add( builder->loader ); } /* return now! */ FT_TRACE4(( "\n" )); return error; case cff_op_abs: FT_TRACE4(( " abs\n" )); if ( args[0] < 0 ) args[0] = -args[0]; args++; break; case cff_op_add: FT_TRACE4(( " add\n" )); args[0] += args[1]; args++; break; case cff_op_sub: FT_TRACE4(( " sub\n" )); args[0] -= args[1]; args++; break; case cff_op_div: FT_TRACE4(( " div\n" )); args[0] = FT_DivFix( args[0], args[1] ); args++; break; case cff_op_neg: FT_TRACE4(( " neg\n" )); args[0] = -args[0]; args++; break; case cff_op_random: { FT_Fixed Rand; FT_TRACE4(( " rand\n" )); Rand = seed; if ( Rand >= 0x8000L ) Rand++; args[0] = Rand; seed = FT_MulFix( seed, 0x10000L - seed ); if ( seed == 0 ) seed += 0x2873; args++; } break; case cff_op_mul: FT_TRACE4(( " mul\n" )); args[0] = FT_MulFix( args[0], args[1] ); args++; break; case cff_op_sqrt: FT_TRACE4(( " sqrt\n" )); if ( args[0] > 0 ) { FT_Int count = 9; FT_Fixed root = args[0]; FT_Fixed new_root; for (;;) { new_root = ( root + FT_DivFix( args[0], root ) + 1 ) >> 1; if ( new_root == root || count <= 0 ) break; root = new_root; } args[0] = new_root; } else args[0] = 0; args++; break; case cff_op_drop: /* nothing */ FT_TRACE4(( " drop\n" )); break; case cff_op_exch: { FT_Fixed tmp; FT_TRACE4(( " exch\n" )); tmp = args[0]; args[0] = args[1]; args[1] = tmp; args += 2; } break; case cff_op_index: { FT_Int idx = (FT_Int)( args[0] >> 16 ); FT_TRACE4(( " index\n" )); if ( idx < 0 ) idx = 0; else if ( idx > num_args - 2 ) idx = num_args - 2; args[0] = args[-( idx + 1 )]; args++; } break; case cff_op_roll: { FT_Int count = (FT_Int)( args[0] >> 16 ); FT_Int idx = (FT_Int)( args[1] >> 16 ); FT_TRACE4(( " roll\n" )); if ( count <= 0 ) count = 1; args -= count; if ( args < stack ) goto Stack_Underflow; if ( idx >= 0 ) { while ( idx > 0 ) { FT_Fixed tmp = args[count - 1]; FT_Int i; for ( i = count - 2; i >= 0; i-- ) args[i + 1] = args[i]; args[0] = tmp; idx--; } } else { while ( idx < 0 ) { FT_Fixed tmp = args[0]; FT_Int i; for ( i = 0; i < count - 1; i++ ) args[i] = args[i + 1]; args[count - 1] = tmp; idx++; } } args += count; } break; case cff_op_dup: FT_TRACE4(( " dup\n" )); args[1] = args[0]; args += 2; break; case cff_op_put: { FT_Fixed val = args[0]; FT_Int idx = (FT_Int)( args[1] >> 16 ); FT_TRACE4(( " put\n" )); if ( idx >= 0 && idx < CFF_MAX_TRANS_ELEMENTS ) decoder->buildchar[idx] = val; } break; case cff_op_get: { FT_Int idx = (FT_Int)( args[0] >> 16 ); FT_Fixed val = 0; FT_TRACE4(( " get\n" )); if ( idx >= 0 && idx < CFF_MAX_TRANS_ELEMENTS ) val = decoder->buildchar[idx]; args[0] = val; args++; } break; case cff_op_store: FT_TRACE4(( " store\n")); goto Unimplemented; case cff_op_load: FT_TRACE4(( " load\n" )); goto Unimplemented; case cff_op_dotsection: /* this operator is deprecated and ignored by the parser */ FT_TRACE4(( " dotsection\n" )); break; case cff_op_closepath: /* this is an invalid Type 2 operator; however, there */ /* exist fonts which are incorrectly converted from probably */ /* Type 1 to CFF, and some parsers seem to accept it */ FT_TRACE4(( " closepath (invalid op)\n" )); args = stack; break; case cff_op_hsbw: /* this is an invalid Type 2 operator; however, there */ /* exist fonts which are incorrectly converted from probably */ /* Type 1 to CFF, and some parsers seem to accept it */ FT_TRACE4(( " hsbw (invalid op)\n" )); decoder->glyph_width = decoder->nominal_width + ( args[1] >> 16 ); decoder->builder.left_bearing.x = args[0]; decoder->builder.left_bearing.y = 0; x = decoder->builder.pos_x + args[0]; y = decoder->builder.pos_y; args = stack; break; case cff_op_sbw: /* this is an invalid Type 2 operator; however, there */ /* exist fonts which are incorrectly converted from probably */ /* Type 1 to CFF, and some parsers seem to accept it */ FT_TRACE4(( " sbw (invalid op)\n" )); decoder->glyph_width = decoder->nominal_width + ( args[2] >> 16 ); decoder->builder.left_bearing.x = args[0]; decoder->builder.left_bearing.y = args[1]; x = decoder->builder.pos_x + args[0]; y = decoder->builder.pos_y + args[1]; args = stack; break; case cff_op_setcurrentpoint: /* this is an invalid Type 2 operator; however, there */ /* exist fonts which are incorrectly converted from probably */ /* Type 1 to CFF, and some parsers seem to accept it */ FT_TRACE4(( " setcurrentpoint (invalid op)\n" )); x = decoder->builder.pos_x + args[0]; y = decoder->builder.pos_y + args[1]; args = stack; break; case cff_op_callothersubr: /* this is an invalid Type 2 operator; however, there */ /* exist fonts which are incorrectly converted from probably */ /* Type 1 to CFF, and some parsers seem to accept it */ FT_TRACE4(( " callothersubr (invalid op)\n" )); /* subsequent `pop' operands should add the arguments, */ /* this is the implementation described for `unknown' other */ /* subroutines in the Type1 spec. */ /* */ /* XXX Fix return arguments (see discussion below). */ args -= 2 + ( args[-2] >> 16 ); if ( args < stack ) goto Stack_Underflow; break; case cff_op_pop: /* this is an invalid Type 2 operator; however, there */ /* exist fonts which are incorrectly converted from probably */ /* Type 1 to CFF, and some parsers seem to accept it */ FT_TRACE4(( " pop (invalid op)\n" )); /* XXX Increasing `args' is wrong: After a certain number of */ /* `pop's we get a stack overflow. Reason for doing it is */ /* code like this (actually found in a CFF font): */ /* */ /* 17 1 3 callothersubr */ /* pop */ /* callsubr */ /* */ /* Since we handle `callothersubr' as a no-op, and */ /* `callsubr' needs at least one argument, `pop' can't be a */ /* no-op too as it basically should be. */ /* */ /* The right solution would be to provide real support for */ /* `callothersubr' as done in `t1decode.c', however, given */ /* the fact that CFF fonts with `pop' are invalid, it is */ /* questionable whether it is worth the time. */ args++; break; case cff_op_and: { FT_Fixed cond = args[0] && args[1]; FT_TRACE4(( " and\n" )); args[0] = cond ? 0x10000L : 0; args++; } break; case cff_op_or: { FT_Fixed cond = args[0] || args[1]; FT_TRACE4(( " or\n" )); args[0] = cond ? 0x10000L : 0; args++; } break; case cff_op_eq: { FT_Fixed cond = !args[0]; FT_TRACE4(( " eq\n" )); args[0] = cond ? 0x10000L : 0; args++; } break; case cff_op_ifelse: { FT_Fixed cond = ( args[2] <= args[3] ); FT_TRACE4(( " ifelse\n" )); if ( !cond ) args[0] = args[1]; args++; } break; case cff_op_callsubr: { FT_UInt idx = (FT_UInt)( ( args[0] >> 16 ) + decoder->locals_bias ); FT_TRACE4(( " callsubr (idx %d, entering level %d)\n", idx, zone - decoder->zones + 1 )); if ( idx >= decoder->num_locals ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " invalid local subr index\n" )); goto Syntax_Error; } if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " too many nested subrs\n" )); goto Syntax_Error; } zone->cursor = ip; /* save current instruction pointer */ zone++; zone->base = decoder->locals[idx]; zone->limit = decoder->locals[idx + 1]; zone->cursor = zone->base; if ( !zone->base || zone->limit == zone->base ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " invoking empty subrs\n" )); goto Syntax_Error; } decoder->zone = zone; ip = zone->base; limit = zone->limit; } break; case cff_op_callgsubr: { FT_UInt idx = (FT_UInt)( ( args[0] >> 16 ) + decoder->globals_bias ); FT_TRACE4(( " callgsubr (idx %d, entering level %d)\n", idx, zone - decoder->zones + 1 )); if ( idx >= decoder->num_globals ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " invalid global subr index\n" )); goto Syntax_Error; } if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " too many nested subrs\n" )); goto Syntax_Error; } zone->cursor = ip; /* save current instruction pointer */ zone++; zone->base = decoder->globals[idx]; zone->limit = decoder->globals[idx + 1]; zone->cursor = zone->base; if ( !zone->base || zone->limit == zone->base ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " invoking empty subrs\n" )); goto Syntax_Error; } decoder->zone = zone; ip = zone->base; limit = zone->limit; } break; case cff_op_return: FT_TRACE4(( " return (leaving level %d)\n", decoder->zone - decoder->zones )); if ( decoder->zone <= decoder->zones ) { FT_ERROR(( "cff_decoder_parse_charstrings:" " unexpected return\n" )); goto Syntax_Error; } decoder->zone--; zone = decoder->zone; ip = zone->cursor; limit = zone->limit; break; default: Unimplemented: FT_ERROR(( "Unimplemented opcode: %d", ip[-1] )); if ( ip[-1] == 12 ) FT_ERROR(( " %d", ip[0] )); FT_ERROR(( "\n" )); return FT_THROW( Unimplemented_Feature ); } decoder->top = args; if ( decoder->top - stack >= CFF_MAX_OPERANDS ) goto Stack_Overflow; } /* general operator processing */ } /* while ip < limit */ FT_TRACE4(( "..end..\n\n" )); Fail: return error; Syntax_Error: FT_TRACE4(( "cff_decoder_parse_charstrings: syntax error\n" )); return FT_THROW( Invalid_File_Format ); Stack_Underflow: FT_TRACE4(( "cff_decoder_parse_charstrings: stack underflow\n" )); return FT_THROW( Too_Few_Arguments ); Stack_Overflow: FT_TRACE4(( "cff_decoder_parse_charstrings: stack overflow\n" )); return FT_THROW( Stack_Overflow ); } #endif /* CFF_CONFIG_OPTION_OLD_ENGINE */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** *********/ /********** 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; *max_advance = 0; /* Initialize load decoder */ cff_decoder_init( &decoder, face, 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 = cff_decoder_prepare( &decoder, size, glyph_index ); if ( !error ) error = cff_decoder_parse_charstrings( &decoder, charstring, charstring_len ); 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; TT_Face face = (TT_Face)glyph->root.face; FT_Bool hinting, scaled, force_scaling; CFF_Font cff = (CFF_Font)face->extra.data; 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 << 6; glyph->root.metrics.height = (FT_Pos)metrics.height << 6; glyph->root.metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; glyph->root.metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; glyph->root.metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; glyph->root.metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; glyph->root.metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; glyph->root.metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 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 CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( face ); #endif FT_Byte* charstring; FT_ULong charstring_len; cff_decoder_init( &decoder, face, size, glyph, hinting, FT_LOAD_TARGET_MODE( load_flags ) ); 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 = cff_decoder_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_CFF_HINTING_FREETYPE ) error = cff_decoder_parse_charstrings( &decoder, charstring, charstring_len ); else #endif { error = cf2_decoder_parse_charstrings( &decoder, 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 = cf2_decoder_parse_charstrings( &decoder, 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 ) cff_builder_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_Vector advance; 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; 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 ); if ( !( font_offset.x == 0 && font_offset.y == 0 ) ) FT_Outline_Translate( &glyph->root.outline, font_offset.x, font_offset.y ); advance.x = metrics->horiAdvance; advance.y = 0; FT_Vector_Transform( &advance, &font_matrix ); metrics->horiAdvance = advance.x + font_offset.x; advance.x = 0; advance.y = metrics->vertAdvance; FT_Vector_Transform( &advance, &font_matrix ); metrics->vertAdvance = advance.y + 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; if ( !face->horizontal.number_Of_HMetrics ) metrics->horiBearingX = cbox.xMin; metrics->horiBearingY = cbox.yMax; if ( has_vertical_info ) metrics->vertBearingX = metrics->horiBearingX - metrics->horiAdvance / 2; else { if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) ft_synthesize_vertical_metrics( metrics, metrics->vertAdvance ); } } } return error; } /* END */