/**************************************************************************** * * t1decode.c * * PostScript Type 1 decoding routines (body). * * Copyright (C) 2000-2023 by * David Turner, Robert Wilhelm, and Werner Lemberg. * * This file is part of the FreeType project, and may only be used, * modified, and distributed under the terms of the FreeType project * license, LICENSE.TXT. By continuing to use, modify, or distribute * this file you indicate that you have read the license and * understand and accept it fully. * */ #include <freetype/internal/ftcalc.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/pshints.h> #include <freetype/internal/fthash.h> #include <freetype/ftoutln.h> #include "t1decode.h" #include "psobjs.h" #include "psauxerr.h" /* ensure proper sign extension */ #define Fix2Int( f ) … #define Fix2UInt( f ) … /************************************************************************** * * 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 … T1_Operator; static const FT_Int t1_args_count[op_max] = …; /************************************************************************** * * @Function: * t1_lookup_glyph_by_stdcharcode_ps * * @Description: * Looks up a given glyph by its StandardEncoding charcode. Used to * implement the SEAC Type 1 operator in the Adobe engine * * @Input: * face :: * The current face object. * * charcode :: * The character code to look for. * * @Return: * A glyph index in the font face. Returns -1 if the corresponding * glyph wasn't found. */ FT_LOCAL_DEF( FT_Int ) t1_lookup_glyph_by_stdcharcode_ps( PS_Decoder* decoder, FT_Int charcode ) { … } #ifdef T1_CONFIG_OPTION_OLD_ENGINE /************************************************************************** * * @Function: * t1_lookup_glyph_by_stdcharcode * * @Description: * Looks up a given glyph by its StandardEncoding charcode. Used to * implement the SEAC Type 1 operator. * * @Input: * face :: * The current face object. * * charcode :: * The character code to look for. * * @Return: * A glyph index in the font face. Returns -1 if the corresponding * glyph wasn't found. */ static FT_Int t1_lookup_glyph_by_stdcharcode( T1_Decoder decoder, FT_Int charcode ) { FT_UInt n; const FT_String* glyph_name; FT_Service_PsCMaps psnames = decoder->psnames; /* check range of standard char code */ if ( charcode < 0 || charcode > 255 ) return -1; glyph_name = psnames->adobe_std_strings( psnames->adobe_std_encoding[charcode]); for ( n = 0; n < decoder->num_glyphs; n++ ) { FT_String* name = (FT_String*)decoder->glyph_names[n]; if ( name && name[0] == glyph_name[0] && ft_strcmp( name, glyph_name ) == 0 ) return (FT_Int)n; } return -1; } /* parse a single Type 1 glyph */ FT_LOCAL_DEF( FT_Error ) t1_decoder_parse_glyph( T1_Decoder decoder, FT_UInt glyph ) { return decoder->parse_callback( decoder, glyph ); } /************************************************************************** * * @Function: * t1operator_seac * * @Description: * Implements the `seac' Type 1 operator for a Type 1 decoder. * * @Input: * decoder :: * The current CID decoder. * * asb :: * The accent's side bearing. * * adx :: * The horizontal offset of the accent. * * ady :: * The vertical offset of the accent. * * bchar :: * The base character's StandardEncoding charcode. * * achar :: * The accent character's StandardEncoding charcode. * * @Return: * FreeType error code. 0 means success. */ static FT_Error t1operator_seac( T1_Decoder decoder, FT_Pos asb, FT_Pos adx, FT_Pos ady, FT_Int bchar, FT_Int achar ) { FT_Error error; FT_Int bchar_index, achar_index; #if 0 FT_Int n_base_points; FT_Outline* base = decoder->builder.base; #endif FT_Vector left_bearing, advance; #ifdef FT_CONFIG_OPTION_INCREMENTAL T1_Face face = (T1_Face)decoder->builder.face; #endif if ( decoder->seac ) { FT_ERROR(( "t1operator_seac: invalid nested seac\n" )); return FT_THROW( Syntax_Error ); } if ( decoder->builder.metrics_only ) { FT_ERROR(( "t1operator_seac: unexpected seac\n" )); return FT_THROW( Syntax_Error ); } /* seac weirdness */ adx += decoder->builder.left_bearing.x; /* `glyph_names' is set to 0 for CID fonts which do not */ /* include an encoding. How can we deal with these? */ #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( decoder->glyph_names == 0 && !face->root.internal->incremental_interface ) #else if ( decoder->glyph_names == 0 ) #endif /* FT_CONFIG_OPTION_INCREMENTAL */ { FT_ERROR(( "t1operator_seac:" " glyph names table not available in this font\n" )); return FT_THROW( Syntax_Error ); } #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( face->root.internal->incremental_interface ) { /* the caller must handle the font encoding also */ bchar_index = bchar; achar_index = achar; } else #endif { bchar_index = t1_lookup_glyph_by_stdcharcode( decoder, bchar ); achar_index = t1_lookup_glyph_by_stdcharcode( decoder, achar ); } if ( bchar_index < 0 || achar_index < 0 ) { FT_ERROR(( "t1operator_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 ( decoder->builder.no_recurse ) { FT_GlyphSlot glyph = (FT_GlyphSlot)decoder->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)FIXED_TO_INT( adx - asb ); subg->arg2 = (FT_Int)FIXED_TO_INT( ady ); /* 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; goto Exit; } /* First load `bchar' in builder */ /* now load the unscaled outline */ FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */ /* save the left bearing and width of the SEAC */ /* glyph as they will be erased by the next load */ left_bearing = decoder->builder.left_bearing; advance = decoder->builder.advance; /* the seac operator must not be nested */ decoder->seac = TRUE; error = t1_decoder_parse_glyph( decoder, (FT_UInt)bchar_index ); decoder->seac = FALSE; if ( error ) goto Exit; /* If the SEAC glyph doesn't have a (H)SBW of its */ /* own use the values from the base glyph. */ if ( decoder->builder.parse_state != T1_Parse_Have_Width ) { left_bearing = decoder->builder.left_bearing; advance = decoder->builder.advance; } decoder->builder.left_bearing.x = 0; decoder->builder.left_bearing.y = 0; decoder->builder.pos_x = adx - asb; decoder->builder.pos_y = ady; /* Now load `achar' on top of */ /* the base outline */ /* the seac operator must not be nested */ decoder->seac = TRUE; error = t1_decoder_parse_glyph( decoder, (FT_UInt)achar_index ); decoder->seac = FALSE; if ( error ) goto Exit; /* restore the left side bearing and advance width */ /* of the SEAC glyph or base character (saved above) */ decoder->builder.left_bearing = left_bearing; decoder->builder.advance = advance; decoder->builder.pos_x = 0; decoder->builder.pos_y = 0; Exit: return error; } /************************************************************************** * * @Function: * t1_decoder_parse_charstrings * * @Description: * Parses a given Type 1 charstrings program. * * @Input: * decoder :: * The current Type 1 decoder. * * charstring_base :: * The base address of the charstring stream. * * charstring_len :: * The length in bytes of the charstring stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) t1_decoder_parse_charstrings( T1_Decoder decoder, FT_Byte* charstring_base, FT_UInt charstring_len ) { FT_Error error; T1_Decoder_Zone zone; FT_Byte* ip; FT_Byte* limit; T1_Builder builder = &decoder->builder; FT_Pos x, y, orig_x, orig_y; FT_Int known_othersubr_result_cnt = 0; FT_Int unknown_othersubr_result_cnt = 0; FT_Bool large_int; FT_Fixed seed; T1_Hints_Funcs hinter; #ifdef FT_DEBUG_LEVEL_TRACE FT_Bool bol = TRUE; #endif /* 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; /* First of all, initialize the decoder */ decoder->top = decoder->stack; decoder->zone = decoder->zones; zone = decoder->zones; builder->parse_state = T1_Parse_Start; hinter = (T1_Hints_Funcs)builder->hints_funcs; /* a font that reads BuildCharArray without setting */ /* its values first is buggy, but ... */ FT_ASSERT( ( decoder->len_buildchar == 0 ) == ( decoder->buildchar == NULL ) ); if ( decoder->buildchar && decoder->len_buildchar > 0 ) FT_ARRAY_ZERO( decoder->buildchar, decoder->len_buildchar ); zone->base = charstring_base; limit = zone->limit = charstring_base + charstring_len; ip = zone->cursor = zone->base; error = FT_Err_Ok; x = orig_x = builder->pos_x; y = orig_y = builder->pos_y; /* begin hints recording session, if any */ if ( hinter ) hinter->open( hinter->hints ); large_int = FALSE; /* now, execute loop */ while ( ip < limit ) { FT_Long* top = decoder->top; T1_Operator op = op_none; FT_Int32 value = 0; FT_ASSERT( known_othersubr_result_cnt == 0 || unknown_othersubr_result_cnt == 0 ); #ifdef FT_DEBUG_LEVEL_TRACE if ( bol ) { FT_TRACE5(( " (%td)", decoder->top - decoder->stack )); bol = FALSE; } #endif /********************************************************************** * * Decode operator or operand * */ /* first of all, decompress operator or value */ switch ( *ip++ ) { case 1: op = op_hstem; break; case 3: op = op_vstem; break; case 4: op = op_vmoveto; break; case 5: op = op_rlineto; break; case 6: op = op_hlineto; break; case 7: op = op_vlineto; break; case 8: op = op_rrcurveto; break; case 9: op = op_closepath; break; case 10: op = op_callsubr; break; case 11: op = op_return; break; case 13: op = op_hsbw; break; case 14: op = op_endchar; break; case 15: /* undocumented, obsolete operator */ op = op_unknown15; break; case 21: op = op_rmoveto; break; case 22: op = op_hmoveto; break; case 30: op = op_vhcurveto; break; case 31: op = op_hvcurveto; break; case 12: if ( ip >= limit ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " invalid escape (12+EOF)\n" )); goto Syntax_Error; } switch ( *ip++ ) { case 0: op = op_dotsection; break; case 1: op = op_vstem3; break; case 2: op = op_hstem3; break; case 6: op = op_seac; break; case 7: op = op_sbw; break; case 12: op = op_div; break; case 16: op = op_callothersubr; break; case 17: op = op_pop; break; case 33: op = op_setcurrentpoint; break; default: FT_ERROR(( "t1_decoder_parse_charstrings:" " invalid escape (12+%d)\n", ip[-1] )); goto Syntax_Error; } break; case 255: /* four bytes integer */ if ( ip + 4 > limit ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unexpected EOF in integer\n" )); goto Syntax_Error; } value = (FT_Int32)( ( (FT_UInt32)ip[0] << 24 ) | ( (FT_UInt32)ip[1] << 16 ) | ( (FT_UInt32)ip[2] << 8 ) | (FT_UInt32)ip[3] ); ip += 4; /* According to the specification, values > 32000 or < -32000 must */ /* be followed by a `div' operator to make the result be in the */ /* range [-32000;32000]. We expect that the second argument of */ /* `div' is not a large number. Additionally, we don't handle */ /* stuff like `<large1> <large2> <num> div <num> div' or */ /* <large1> <large2> <num> div div'. This is probably not allowed */ /* anyway. */ if ( value > 32000 || value < -32000 ) { if ( large_int ) FT_ERROR(( "t1_decoder_parse_charstrings:" " no `div' after large integer\n" )); else large_int = TRUE; } else { if ( !large_int ) value = (FT_Int32)( (FT_UInt32)value << 16 ); } break; default: if ( ip[-1] >= 32 ) { if ( ip[-1] < 247 ) value = (FT_Int32)ip[-1] - 139; else { if ( ++ip > limit ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unexpected EOF in integer\n" )); goto Syntax_Error; } if ( ip[-2] < 251 ) value = ( ( ip[-2] - 247 ) * 256 ) + ip[-1] + 108; else value = -( ( ( ip[-2] - 251 ) * 256 ) + ip[-1] + 108 ); } if ( !large_int ) value = (FT_Int32)( (FT_UInt32)value << 16 ); } else { FT_ERROR(( "t1_decoder_parse_charstrings:" " invalid byte (%d)\n", ip[-1] )); goto Syntax_Error; } } if ( unknown_othersubr_result_cnt > 0 ) { switch ( op ) { case op_callsubr: case op_return: case op_none: case op_pop: break; default: /* all operands have been transferred by previous pops */ unknown_othersubr_result_cnt = 0; break; } } if ( large_int && !( op == op_none || op == op_div ) ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " no `div' after large integer\n" )); large_int = FALSE; } /********************************************************************** * * Push value on stack, or process operator * */ if ( op == op_none ) { if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS ) { FT_ERROR(( "t1_decoder_parse_charstrings: stack overflow\n" )); goto Syntax_Error; } #ifdef FT_DEBUG_LEVEL_TRACE if ( large_int ) FT_TRACE4(( " %d", value )); else FT_TRACE4(( " %d", value / 65536 )); #endif *top++ = value; decoder->top = top; } else if ( op == op_callothersubr ) /* callothersubr */ { FT_Int subr_no; FT_Int arg_cnt; #ifdef FT_DEBUG_LEVEL_TRACE FT_TRACE4(( " callothersubr\n" )); bol = TRUE; #endif if ( top - decoder->stack < 2 ) goto Stack_Underflow; top -= 2; subr_no = Fix2Int( top[1] ); arg_cnt = Fix2Int( top[0] ); /************************************************************ * * remove all operands to callothersubr from the stack * * for handled othersubrs, where we know the number of * arguments, we increase the stack by the value of * known_othersubr_result_cnt * * for unhandled othersubrs the following pops adjust the * stack pointer as necessary */ if ( arg_cnt > top - decoder->stack ) goto Stack_Underflow; top -= arg_cnt; known_othersubr_result_cnt = 0; unknown_othersubr_result_cnt = 0; /* XXX TODO: The checks to `arg_count == <whatever>' */ /* might not be correct; an othersubr expects a certain */ /* number of operands on the PostScript stack (as opposed */ /* to the T1 stack) but it doesn't have to put them there */ /* by itself; previous othersubrs might have left the */ /* operands there if they were not followed by an */ /* appropriate number of pops */ /* */ /* On the other hand, Adobe Reader 7.0.8 for Linux doesn't */ /* accept a font that contains charstrings like */ /* */ /* 100 200 2 20 callothersubr */ /* 300 1 20 callothersubr pop */ /* */ /* Perhaps this is the reason why BuildCharArray exists. */ switch ( subr_no ) { case 0: /* end flex feature */ if ( arg_cnt != 3 ) goto Unexpected_OtherSubr; if ( !decoder->flex_state || decoder->num_flex_vectors != 7 ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unexpected flex end\n" )); goto Syntax_Error; } /* the two `results' are popped by the following setcurrentpoint */ top[0] = x; top[1] = y; known_othersubr_result_cnt = 2; break; case 1: /* start flex feature */ if ( arg_cnt != 0 ) goto Unexpected_OtherSubr; if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) || FT_SET_ERROR( t1_builder_check_points( builder, 6 ) ) ) goto Fail; decoder->flex_state = 1; decoder->num_flex_vectors = 0; break; case 2: /* add flex vectors */ { FT_Int idx; if ( arg_cnt != 0 ) goto Unexpected_OtherSubr; if ( !decoder->flex_state ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " missing flex start\n" )); goto Syntax_Error; } /* note that we should not add a point for index 0; */ /* this will move our current position to the flex */ /* point without adding any point to the outline */ idx = decoder->num_flex_vectors++; if ( idx > 0 && idx < 7 ) { /* in malformed fonts it is possible to have other */ /* opcodes in the middle of a flex (which don't */ /* increase `num_flex_vectors'); we thus have to */ /* check whether we can add a point */ if ( FT_SET_ERROR( t1_builder_check_points( builder, 1 ) ) ) goto Syntax_Error; t1_builder_add_point( builder, x, y, (FT_Byte)( idx == 3 || idx == 6 ) ); } } break; case 3: /* change hints */ if ( arg_cnt != 1 ) goto Unexpected_OtherSubr; known_othersubr_result_cnt = 1; if ( hinter ) hinter->reset( hinter->hints, (FT_UInt)builder->current->n_points ); break; case 12: case 13: /* counter control hints, clear stack */ top = decoder->stack; break; case 14: case 15: case 16: case 17: case 18: /* multiple masters */ { PS_Blend blend = decoder->blend; FT_UInt num_points, nn, mm; FT_Long* delta; FT_Long* values; if ( !blend ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unexpected multiple masters operator\n" )); goto Syntax_Error; } num_points = (FT_UInt)subr_no - 13 + ( subr_no == 18 ); if ( arg_cnt != (FT_Int)( num_points * blend->num_designs ) ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " incorrect number of multiple masters arguments\n" )); goto Syntax_Error; } /* We want to compute */ /* */ /* a0*w0 + a1*w1 + ... + ak*wk */ /* */ /* but we only have a0, a1-a0, a2-a0, ..., ak-a0. */ /* */ /* However, given that w0 + w1 + ... + wk == 1, we can */ /* rewrite it easily as */ /* */ /* a0 + (a1-a0)*w1 + (a2-a0)*w2 + ... + (ak-a0)*wk */ /* */ /* where k == num_designs-1. */ /* */ /* I guess that's why it's written in this `compact' */ /* form. */ /* */ delta = top + num_points; values = top; for ( nn = 0; nn < num_points; nn++ ) { FT_Long tmp = values[0]; for ( mm = 1; mm < blend->num_designs; mm++ ) tmp = ADD_LONG( tmp, FT_MulFix( *delta++, blend->weight_vector[mm] ) ); *values++ = tmp; } known_othersubr_result_cnt = (FT_Int)num_points; break; } case 19: /* <idx> 1 19 callothersubr */ /* => replace elements starting from index cvi( <idx> ) */ /* of BuildCharArray with WeightVector */ { FT_Int idx; PS_Blend blend = decoder->blend; if ( arg_cnt != 1 || !blend ) goto Unexpected_OtherSubr; idx = Fix2Int( top[0] ); if ( idx < 0 || (FT_UInt)idx + blend->num_designs > decoder->len_buildchar ) goto Unexpected_OtherSubr; ft_memcpy( &decoder->buildchar[idx], blend->weight_vector, blend->num_designs * sizeof ( blend->weight_vector[0] ) ); } break; case 20: /* <arg1> <arg2> 2 20 callothersubr pop */ /* ==> push <arg1> + <arg2> onto T1 stack */ if ( arg_cnt != 2 ) goto Unexpected_OtherSubr; top[0] = ADD_LONG( top[0], top[1] ); known_othersubr_result_cnt = 1; break; case 21: /* <arg1> <arg2> 2 21 callothersubr pop */ /* ==> push <arg1> - <arg2> onto T1 stack */ if ( arg_cnt != 2 ) goto Unexpected_OtherSubr; top[0] = SUB_LONG( top[0], top[1] ); known_othersubr_result_cnt = 1; break; case 22: /* <arg1> <arg2> 2 22 callothersubr pop */ /* ==> push <arg1> * <arg2> onto T1 stack */ if ( arg_cnt != 2 ) goto Unexpected_OtherSubr; top[0] = FT_MulFix( top[0], top[1] ); known_othersubr_result_cnt = 1; break; case 23: /* <arg1> <arg2> 2 23 callothersubr pop */ /* ==> push <arg1> / <arg2> onto T1 stack */ if ( arg_cnt != 2 || top[1] == 0 ) goto Unexpected_OtherSubr; top[0] = FT_DivFix( top[0], top[1] ); known_othersubr_result_cnt = 1; break; case 24: /* <val> <idx> 2 24 callothersubr */ /* ==> set BuildCharArray[cvi( <idx> )] = <val> */ { FT_UInt idx; PS_Blend blend = decoder->blend; if ( arg_cnt != 2 || !blend ) goto Unexpected_OtherSubr; idx = Fix2UInt( top[1] ); if ( idx >= decoder->len_buildchar ) goto Unexpected_OtherSubr; decoder->buildchar[idx] = top[0]; } break; case 25: /* <idx> 1 25 callothersubr pop */ /* ==> push BuildCharArray[cvi( idx )] */ /* onto T1 stack */ { FT_UInt idx; PS_Blend blend = decoder->blend; if ( arg_cnt != 1 || !blend ) goto Unexpected_OtherSubr; idx = Fix2UInt( top[0] ); if ( idx >= decoder->len_buildchar ) goto Unexpected_OtherSubr; top[0] = decoder->buildchar[idx]; } known_othersubr_result_cnt = 1; break; #if 0 case 26: /* <val> mark <idx> ==> set BuildCharArray[cvi( <idx> )] = <val>, */ /* leave mark on T1 stack */ /* <val> <idx> ==> set BuildCharArray[cvi( <idx> )] = <val> */ XXX which routine has left its mark on the (PostScript) stack?; break; #endif case 27: /* <res1> <res2> <val1> <val2> 4 27 callothersubr pop */ /* ==> push <res1> onto T1 stack if <val1> <= <val2>, */ /* otherwise push <res2> */ if ( arg_cnt != 4 ) goto Unexpected_OtherSubr; if ( top[2] > top[3] ) top[0] = top[1]; known_othersubr_result_cnt = 1; break; case 28: /* 0 28 callothersubr pop */ /* => push random value from interval [0, 1) onto stack */ if ( arg_cnt != 0 ) goto Unexpected_OtherSubr; { FT_Fixed Rand; Rand = seed; if ( Rand >= 0x8000L ) Rand++; top[0] = Rand; seed = FT_MulFix( seed, 0x10000L - seed ); if ( seed == 0 ) seed += 0x2873; } known_othersubr_result_cnt = 1; break; default: if ( arg_cnt >= 0 && subr_no >= 0 ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unknown othersubr [%d %d], wish me luck\n", arg_cnt, subr_no )); unknown_othersubr_result_cnt = arg_cnt; break; } /* fall through */ Unexpected_OtherSubr: FT_ERROR(( "t1_decoder_parse_charstrings:" " invalid othersubr [%d %d]\n", arg_cnt, subr_no )); goto Syntax_Error; } top += known_othersubr_result_cnt; decoder->top = top; } else /* general operator */ { FT_Int num_args = t1_args_count[op]; FT_ASSERT( num_args >= 0 ); if ( top - decoder->stack < num_args ) goto Stack_Underflow; /* XXX Operators usually take their operands from the */ /* bottom of the stack, i.e., the operands are */ /* decoder->stack[0], ..., decoder->stack[num_args - 1]; */ /* only div, callsubr, and callothersubr are different. */ /* In practice it doesn't matter (?). */ #ifdef FT_DEBUG_LEVEL_TRACE switch ( op ) { case op_callsubr: case op_div: case op_callothersubr: case op_pop: case op_return: break; default: if ( top - decoder->stack != num_args ) FT_TRACE0(( "t1_decoder_parse_charstrings:" " too much operands on the stack" " (seen %td, expected %d)\n", top - decoder->stack, num_args )); break; } #endif /* FT_DEBUG_LEVEL_TRACE */ top -= num_args; switch ( op ) { case op_endchar: FT_TRACE4(( " endchar\n" )); t1_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 ); /* the compiler should optimize away this empty loop but ... */ #ifdef FT_DEBUG_LEVEL_TRACE if ( decoder->len_buildchar > 0 ) { FT_UInt i; FT_TRACE4(( "BuildCharArray = [ " )); for ( i = 0; i < decoder->len_buildchar; i++ ) FT_TRACE4(( "%ld ", decoder->buildchar[i] )); FT_TRACE4(( "]\n" )); } #endif /* FT_DEBUG_LEVEL_TRACE */ FT_TRACE4(( "\n" )); /* return now! */ return FT_Err_Ok; case op_hsbw: FT_TRACE4(( " hsbw" )); builder->parse_state = T1_Parse_Have_Width; builder->left_bearing.x = ADD_LONG( builder->left_bearing.x, top[0] ); builder->advance.x = top[1]; builder->advance.y = 0; orig_x = x = ADD_LONG( builder->pos_x, top[0] ); orig_y = y = builder->pos_y; FT_UNUSED( orig_y ); /* `metrics_only' indicates that we only want to compute the */ /* glyph's metrics (lsb + advance width) without loading the */ /* rest of it; so exit immediately */ if ( builder->metrics_only ) { FT_TRACE4(( "\n" )); return FT_Err_Ok; } break; case op_seac: return t1operator_seac( decoder, top[0], top[1], top[2], Fix2Int( top[3] ), Fix2Int( top[4] ) ); case op_sbw: FT_TRACE4(( " sbw" )); builder->parse_state = T1_Parse_Have_Width; builder->left_bearing.x = ADD_LONG( builder->left_bearing.x, top[0] ); builder->left_bearing.y = ADD_LONG( builder->left_bearing.y, top[1] ); builder->advance.x = top[2]; builder->advance.y = top[3]; x = ADD_LONG( builder->pos_x, top[0] ); y = ADD_LONG( builder->pos_y, top[1] ); /* `metrics_only' indicates that we only want to compute the */ /* glyph's metrics (lsb + advance width) without loading the */ /* rest of it; so exit immediately */ if ( builder->metrics_only ) { FT_TRACE4(( "\n" )); return FT_Err_Ok; } break; case op_closepath: FT_TRACE4(( " closepath" )); /* if there is no path, `closepath' is a no-op */ if ( builder->parse_state == T1_Parse_Have_Path || builder->parse_state == T1_Parse_Have_Moveto ) t1_builder_close_contour( builder ); builder->parse_state = T1_Parse_Have_Width; break; case op_hlineto: FT_TRACE4(( " hlineto" )); if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) ) goto Fail; x = ADD_LONG( x, top[0] ); goto Add_Line; case op_hmoveto: FT_TRACE4(( " hmoveto" )); x = ADD_LONG( x, top[0] ); if ( !decoder->flex_state ) { if ( builder->parse_state == T1_Parse_Start ) goto Syntax_Error; builder->parse_state = T1_Parse_Have_Moveto; } break; case op_hvcurveto: FT_TRACE4(( " hvcurveto" )); if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) || FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) ) goto Fail; x = ADD_LONG( x, top[0] ); t1_builder_add_point( builder, x, y, 0 ); x = ADD_LONG( x, top[1] ); y = ADD_LONG( y, top[2] ); t1_builder_add_point( builder, x, y, 0 ); y = ADD_LONG( y, top[3] ); t1_builder_add_point( builder, x, y, 1 ); break; case op_rlineto: FT_TRACE4(( " rlineto" )); if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) ) goto Fail; x = ADD_LONG( x, top[0] ); y = ADD_LONG( y, top[1] ); Add_Line: if ( FT_SET_ERROR( t1_builder_add_point1( builder, x, y ) ) ) goto Fail; break; case op_rmoveto: FT_TRACE4(( " rmoveto" )); x = ADD_LONG( x, top[0] ); y = ADD_LONG( y, top[1] ); if ( !decoder->flex_state ) { if ( builder->parse_state == T1_Parse_Start ) goto Syntax_Error; builder->parse_state = T1_Parse_Have_Moveto; } break; case op_rrcurveto: FT_TRACE4(( " rrcurveto" )); if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) || FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) ) goto Fail; x = ADD_LONG( x, top[0] ); y = ADD_LONG( y, top[1] ); t1_builder_add_point( builder, x, y, 0 ); x = ADD_LONG( x, top[2] ); y = ADD_LONG( y, top[3] ); t1_builder_add_point( builder, x, y, 0 ); x = ADD_LONG( x, top[4] ); y = ADD_LONG( y, top[5] ); t1_builder_add_point( builder, x, y, 1 ); break; case op_vhcurveto: FT_TRACE4(( " vhcurveto" )); if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) || FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) ) goto Fail; y = ADD_LONG( y, top[0] ); t1_builder_add_point( builder, x, y, 0 ); x = ADD_LONG( x, top[1] ); y = ADD_LONG( y, top[2] ); t1_builder_add_point( builder, x, y, 0 ); x = ADD_LONG( x, top[3] ); t1_builder_add_point( builder, x, y, 1 ); break; case op_vlineto: FT_TRACE4(( " vlineto" )); if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) ) goto Fail; y = ADD_LONG( y, top[0] ); goto Add_Line; case op_vmoveto: FT_TRACE4(( " vmoveto" )); y = ADD_LONG( y, top[0] ); if ( !decoder->flex_state ) { if ( builder->parse_state == T1_Parse_Start ) goto Syntax_Error; builder->parse_state = T1_Parse_Have_Moveto; } break; case op_div: FT_TRACE4(( " div" )); /* if `large_int' is set, we divide unscaled numbers; */ /* otherwise, we divide numbers in 16.16 format -- */ /* in both cases, it is the same operation */ *top = FT_DivFix( top[0], top[1] ); top++; large_int = FALSE; break; case op_callsubr: { FT_Int idx; FT_TRACE4(( " callsubr" )); idx = Fix2Int( top[0] ); if ( decoder->subrs_hash ) { size_t* val = ft_hash_num_lookup( idx, decoder->subrs_hash ); if ( val ) idx = *val; else idx = -1; } if ( idx < 0 || idx >= decoder->num_subrs ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " invalid subrs index\n" )); goto Syntax_Error; } if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " too many nested subrs\n" )); goto Syntax_Error; } zone->cursor = ip; /* save current instruction pointer */ zone++; /* The Type 1 driver stores subroutines without the seed bytes. */ /* The CID driver stores subroutines with seed bytes. This */ /* case is taken care of when decoder->subrs_len == 0. */ zone->base = decoder->subrs[idx]; if ( decoder->subrs_len ) zone->limit = zone->base + decoder->subrs_len[idx]; else { /* We are using subroutines from a CID font. We must adjust */ /* for the seed bytes. */ zone->base += ( decoder->lenIV >= 0 ? decoder->lenIV : 0 ); zone->limit = decoder->subrs[idx + 1]; } zone->cursor = zone->base; if ( !zone->base ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " invoking empty subrs\n" )); goto Syntax_Error; } decoder->zone = zone; ip = zone->base; limit = zone->limit; break; } case op_pop: FT_TRACE4(( " pop" )); if ( known_othersubr_result_cnt > 0 ) { known_othersubr_result_cnt--; /* ignore, we pushed the operands ourselves */ break; } if ( unknown_othersubr_result_cnt == 0 ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " no more operands for othersubr\n" )); goto Syntax_Error; } unknown_othersubr_result_cnt--; top++; /* `push' the operand to callothersubr onto the stack */ break; case op_return: FT_TRACE4(( " return" )); if ( zone <= decoder->zones ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unexpected return\n" )); goto Syntax_Error; } zone--; ip = zone->cursor; limit = zone->limit; decoder->zone = zone; break; case op_dotsection: FT_TRACE4(( " dotsection" )); break; case op_hstem: FT_TRACE4(( " hstem" )); /* record horizontal hint */ if ( hinter ) { /* top[0] += builder->left_bearing.y; */ hinter->stem( hinter->hints, 1, top ); } break; case op_hstem3: FT_TRACE4(( " hstem3" )); /* record horizontal counter-controlled hints */ if ( hinter ) hinter->stem3( hinter->hints, 1, top ); break; case op_vstem: FT_TRACE4(( " vstem" )); /* record vertical hint */ if ( hinter ) { top[0] = ADD_LONG( top[0], orig_x ); hinter->stem( hinter->hints, 0, top ); } break; case op_vstem3: FT_TRACE4(( " vstem3" )); /* record vertical counter-controlled hints */ if ( hinter ) { FT_Pos dx = orig_x; top[0] = ADD_LONG( top[0], dx ); top[2] = ADD_LONG( top[2], dx ); top[4] = ADD_LONG( top[4], dx ); hinter->stem3( hinter->hints, 0, top ); } break; case op_setcurrentpoint: FT_TRACE4(( " setcurrentpoint" )); /* From the T1 specification, section 6.4: */ /* */ /* The setcurrentpoint command is used only in */ /* conjunction with results from OtherSubrs procedures. */ /* known_othersubr_result_cnt != 0 is already handled */ /* above. */ /* Note, however, that both Ghostscript and Adobe */ /* Distiller handle this situation by silently ignoring */ /* the inappropriate `setcurrentpoint' instruction. So */ /* we do the same. */ #if 0 if ( decoder->flex_state != 1 ) { FT_ERROR(( "t1_decoder_parse_charstrings:" " unexpected `setcurrentpoint'\n" )); goto Syntax_Error; } else ... #endif x = top[0]; y = top[1]; decoder->flex_state = 0; break; case op_unknown15: FT_TRACE4(( " opcode_15" )); /* nothing to do except to pop the two arguments */ break; default: FT_ERROR(( "t1_decoder_parse_charstrings:" " unhandled opcode %d\n", op )); goto Syntax_Error; } /* XXX Operators usually clear the operand stack; */ /* only div, callsubr, callothersubr, pop, and */ /* return are different. */ /* In practice it doesn't matter (?). */ decoder->top = top; #ifdef FT_DEBUG_LEVEL_TRACE FT_TRACE4(( "\n" )); bol = TRUE; #endif } /* general operator processing */ } /* while ip < limit */ FT_TRACE4(( "..end..\n" )); FT_TRACE4(( "\n" )); Fail: return error; Syntax_Error: return FT_THROW( Syntax_Error ); Stack_Underflow: return FT_THROW( Stack_Underflow ); } #else /* !T1_CONFIG_OPTION_OLD_ENGINE */ /************************************************************************** * * @Function: * t1_decoder_parse_metrics * * @Description: * Parses a given Type 1 charstrings program to extract width * * @Input: * decoder :: * The current Type 1 decoder. * * charstring_base :: * The base address of the charstring stream. * * charstring_len :: * The length in bytes of the charstring stream. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) t1_decoder_parse_metrics( T1_Decoder decoder, FT_Byte* charstring_base, FT_UInt charstring_len ) { … } #endif /* !T1_CONFIG_OPTION_OLD_ENGINE */ /* initialize T1 decoder */ FT_LOCAL_DEF( FT_Error ) t1_decoder_init( T1_Decoder decoder, FT_Face face, FT_Size size, FT_GlyphSlot slot, FT_Byte** glyph_names, PS_Blend blend, FT_Bool hinting, FT_Render_Mode hint_mode, T1_Decoder_Callback parse_callback ) { … } /* finalize T1 decoder */ FT_LOCAL_DEF( void ) t1_decoder_done( T1_Decoder decoder ) { … } /* END */
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