/***************************************************************************/ /* */ /* t1decode.c */ /* */ /* PostScript Type 1 decoding routines (body). */ /* */ /* Copyright 2000-2011 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 FT_INTERNAL_CALC_H #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_POSTSCRIPT_HINTS_H #include FT_OUTLINE_H #include "t1decode.h" #include "psobjs.h" #include "psauxerr.h" /* ensure proper sign extension */ #define Fix2Int( f ) ( (FT_Int)(FT_Short)( (f) >> 16 ) ) /*************************************************************************/ /* */ /* 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_t1decode typedef enum T1_Operator_ { op_none = 0, op_endchar, op_hsbw, op_seac, op_sbw, op_closepath, op_hlineto, op_hmoveto, op_hvcurveto, op_rlineto, op_rmoveto, op_rrcurveto, op_vhcurveto, op_vlineto, op_vmoveto, op_dotsection, op_hstem, op_hstem3, op_vstem, op_vstem3, op_div, op_callothersubr, op_callsubr, op_pop, op_return, op_setcurrentpoint, op_unknown15, op_max /* never remove this one */ } T1_Operator; static const FT_Int t1_args_count[op_max] = { 0, /* none */ 0, /* endchar */ 2, /* hsbw */ 5, /* seac */ 4, /* sbw */ 0, /* closepath */ 1, /* hlineto */ 1, /* hmoveto */ 4, /* hvcurveto */ 2, /* rlineto */ 2, /* rmoveto */ 6, /* rrcurveto */ 4, /* vhcurveto */ 1, /* vlineto */ 1, /* vmoveto */ 0, /* dotsection */ 2, /* hstem */ 6, /* hstem3 */ 2, /* vstem */ 6, /* vstem3 */ 2, /* div */ -1, /* callothersubr */ 1, /* callsubr */ 0, /* pop */ 0, /* return */ 2, /* setcurrentpoint */ 2 /* opcode 15 (undocumented and obsolete) */ }; /*************************************************************************/ /* */ /* */ /* t1_lookup_glyph_by_stdcharcode */ /* */ /* */ /* Looks up a given glyph by its StandardEncoding charcode. Used to */ /* implement the SEAC Type 1 operator. */ /* */ /* */ /* face :: The current face object. */ /* */ /* charcode :: The character code to look for. */ /* */ /* */ /* 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 n; } return -1; } /*************************************************************************/ /* */ /* */ /* t1operator_seac */ /* */ /* */ /* Implements the `seac' Type 1 operator for a Type 1 decoder. */ /* */ /* */ /* 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. */ /* */ /* */ /* 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 PSaux_Err_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 PSaux_Err_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 PSaux_Err_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 */ /* the seac operator must not be nested */ decoder->seac = TRUE; error = t1_decoder_parse_glyph( decoder, bchar_index ); decoder->seac = FALSE; if ( error ) goto Exit; /* save the left bearing and width of the base character */ /* as they will be erased by the next load. */ 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, achar_index ); decoder->seac = FALSE; if ( error ) goto Exit; /* restore the left side bearing and */ /* advance width of the base character */ decoder->builder.left_bearing = left_bearing; decoder->builder.advance = advance; decoder->builder.pos_x = 0; decoder->builder.pos_y = 0; Exit: return error; } /*************************************************************************/ /* */ /* */ /* t1_decoder_parse_charstrings */ /* */ /* */ /* Parses a given Type 1 charstrings program. */ /* */ /* */ /* 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. */ /* */ /* */ /* 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_PtrDist)(char*)&seed ^ (FT_PtrDist)(char*)&decoder ^ (FT_PtrDist)(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_memset( &decoder->buildchar[0], 0, sizeof( decoder->buildchar[0] ) * decoder->len_buildchar ); FT_TRACE4(( "\n" "Start charstring\n" )); zone->base = charstring_base; limit = zone->limit = charstring_base + charstring_len; ip = zone->cursor = zone->base; error = PSaux_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(( " (%d)", 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_Long)ip[0] << 24 ) | ( (FT_Long)ip[1] << 16 ) | ( (FT_Long)ip[2] << 8 ) | 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 ` div div' or */ /* 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 <<= 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 = ( ( (FT_Int32)ip[-2] - 247 ) << 8 ) + ip[-1] + 108; else value = -( ( ( (FT_Int32)ip[-2] - 251 ) << 8 ) + ip[-1] + 108 ); } if ( !large_int ) 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(( " %ld", value )); else FT_TRACE4(( " %ld", Fix2Int( value ) )); #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 == ' */ /* 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 == 0 || 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; decoder->flex_state = 1; decoder->num_flex_vectors = 0; if ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok || ( error = t1_builder_check_points( builder, 6 ) ) != PSaux_Err_Ok ) goto Fail; break; case 2: /* add flex vectors */ { FT_Int idx; if ( arg_cnt != 0 ) goto Unexpected_OtherSubr; if ( decoder->flex_state == 0 ) { 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 ) 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, 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 += FT_MulFix( *delta++, blend->weight_vector[mm] ); *values++ = tmp; } known_othersubr_result_cnt = num_points; break; } case 19: /* 1 19 callothersubr */ /* => replace elements starting from index cvi( ) */ /* of BuildCharArray with WeightVector */ { FT_Int idx; PS_Blend blend = decoder->blend; if ( arg_cnt != 1 || blend == NULL ) goto Unexpected_OtherSubr; idx = Fix2Int( top[0] ); if ( idx < 0 || 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: /* 2 20 callothersubr pop */ /* ==> push + onto T1 stack */ if ( arg_cnt != 2 ) goto Unexpected_OtherSubr; top[0] += top[1]; /* XXX (over|under)flow */ known_othersubr_result_cnt = 1; break; case 21: /* 2 21 callothersubr pop */ /* ==> push - onto T1 stack */ if ( arg_cnt != 2 ) goto Unexpected_OtherSubr; top[0] -= top[1]; /* XXX (over|under)flow */ known_othersubr_result_cnt = 1; break; case 22: /* 2 22 callothersubr pop */ /* ==> push * 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: /* 2 23 callothersubr pop */ /* ==> push / 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: /* 2 24 callothersubr */ /* ==> set BuildCharArray[cvi( )] = */ { FT_Int idx; PS_Blend blend = decoder->blend; if ( arg_cnt != 2 || blend == NULL ) goto Unexpected_OtherSubr; idx = Fix2Int( top[1] ); if ( idx < 0 || (FT_UInt) idx >= decoder->len_buildchar ) goto Unexpected_OtherSubr; decoder->buildchar[idx] = top[0]; } break; case 25: /* 1 25 callothersubr pop */ /* ==> push BuildCharArray[cvi( idx )] */ /* onto T1 stack */ { FT_Int idx; PS_Blend blend = decoder->blend; if ( arg_cnt != 1 || blend == NULL ) goto Unexpected_OtherSubr; idx = Fix2Int( top[0] ); if ( idx < 0 || (FT_UInt) idx >= decoder->len_buildchar ) goto Unexpected_OtherSubr; top[0] = decoder->buildchar[idx]; } known_othersubr_result_cnt = 1; break; #if 0 case 26: /* mark ==> set BuildCharArray[cvi( )] = , */ /* leave mark on T1 stack */ /* ==> set BuildCharArray[cvi( )] = */ XXX which routine has left its mark on the (PostScript) stack?; break; #endif case 27: /* 4 27 callothersubr pop */ /* ==> push onto T1 stack if <= , */ /* otherwise push */ 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 %d, 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, builder->current->n_points ) ) goto Syntax_Error; /* apply hints to the loaded glyph outline now */ hinter->apply( hinter->hints, builder->current, (PSH_Globals)builder->hints_globals, decoder->hint_mode ); } /* 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(( "%d ", decoder->buildchar[ i ] )); FT_TRACE4(( "]\n" )); } #endif /* FT_DEBUG_LEVEL_TRACE */ FT_TRACE4(( "\n" )); /* return now! */ return PSaux_Err_Ok; case op_hsbw: FT_TRACE4(( " hsbw" )); builder->parse_state = T1_Parse_Have_Width; builder->left_bearing.x += top[0]; builder->advance.x = top[1]; builder->advance.y = 0; orig_x = x = builder->pos_x + top[0]; orig_y = y = builder->pos_y; FT_UNUSED( orig_y ); /* the `metrics_only' indicates that we only want to compute */ /* the glyph's metrics (lsb + advance width), not load the */ /* rest of it; so exit immediately */ if ( builder->metrics_only ) return PSaux_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 += top[0]; builder->left_bearing.y += top[1]; builder->advance.x = top[2]; builder->advance.y = top[3]; x = builder->pos_x + top[0]; y = builder->pos_y + top[1]; /* the `metrics_only' indicates that we only want to compute */ /* the glyph's metrics (lsb + advance width), not load the */ /* rest of it; so exit immediately */ if ( builder->metrics_only ) return PSaux_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 ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok ) goto Fail; x += top[0]; goto Add_Line; case op_hmoveto: FT_TRACE4(( " hmoveto" )); 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 ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok || ( error = t1_builder_check_points( builder, 3 ) ) != PSaux_Err_Ok ) goto Fail; x += top[0]; t1_builder_add_point( builder, x, y, 0 ); x += top[1]; y += top[2]; t1_builder_add_point( builder, x, y, 0 ); y += top[3]; t1_builder_add_point( builder, x, y, 1 ); break; case op_rlineto: FT_TRACE4(( " rlineto" )); if ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok ) goto Fail; x += top[0]; y += top[1]; Add_Line: if ( ( error = t1_builder_add_point1( builder, x, y ) ) != PSaux_Err_Ok ) goto Fail; break; case op_rmoveto: FT_TRACE4(( " rmoveto" )); x += top[0]; 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 ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok || ( error = t1_builder_check_points( builder, 3 ) ) != PSaux_Err_Ok ) goto Fail; x += top[0]; y += top[1]; t1_builder_add_point( builder, x, y, 0 ); x += top[2]; y += top[3]; t1_builder_add_point( builder, x, y, 0 ); x += top[4]; y += top[5]; t1_builder_add_point( builder, x, y, 1 ); break; case op_vhcurveto: FT_TRACE4(( " vhcurveto" )); if ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok || ( error = t1_builder_check_points( builder, 3 ) ) != PSaux_Err_Ok ) goto Fail; y += top[0]; t1_builder_add_point( builder, x, y, 0 ); x += top[1]; y += top[2]; t1_builder_add_point( builder, x, y, 0 ); x += top[3]; t1_builder_add_point( builder, x, y, 1 ); break; case op_vlineto: FT_TRACE4(( " vlineto" )); if ( ( error = t1_builder_start_point( builder, x, y ) ) != PSaux_Err_Ok ) goto Fail; y += top[0]; goto Add_Line; case op_vmoveto: FT_TRACE4(( " vmoveto" )); 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 ( idx < 0 || idx >= (FT_Int)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] += 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] += dx; top[2] += dx; 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\n" )); Fail: return error; Syntax_Error: return PSaux_Err_Syntax_Error; Stack_Underflow: return PSaux_Err_Stack_Underflow; } /* 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 ); } /* 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 ) { FT_MEM_ZERO( decoder, sizeof ( *decoder ) ); /* retrieve PSNames interface from list of current modules */ { FT_Service_PsCMaps psnames = 0; FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS ); if ( !psnames ) { FT_ERROR(( "t1_decoder_init:" " the `psnames' module is not available\n" )); return PSaux_Err_Unimplemented_Feature; } decoder->psnames = psnames; } t1_builder_init( &decoder->builder, face, size, slot, hinting ); /* decoder->buildchar and decoder->len_buildchar have to be */ /* initialized by the caller since we cannot know the length */ /* of the BuildCharArray */ decoder->num_glyphs = (FT_UInt)face->num_glyphs; decoder->glyph_names = glyph_names; decoder->hint_mode = hint_mode; decoder->blend = blend; decoder->parse_callback = parse_callback; decoder->funcs = t1_decoder_funcs; return PSaux_Err_Ok; } /* finalize T1 decoder */ FT_LOCAL_DEF( void ) t1_decoder_done( T1_Decoder decoder ) { t1_builder_done( &decoder->builder ); } /* END */