0,0 → 1,1620 |
/***************************************************************************/ |
/* */ |
/* t1decode.c */ |
/* */ |
/* PostScript Type 1 decoding routines (body). */ |
/* */ |
/* Copyright 2000-2013 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 <ft2build.h> |
#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) */ |
}; |
|
|
/*************************************************************************/ |
/* */ |
/* <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 n; |
} |
|
return -1; |
} |
|
|
/*************************************************************************/ |
/* */ |
/* <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 */ |
|
/* 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; |
} |
|
|
/*************************************************************************/ |
/* */ |
/* <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_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 = 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(( " (%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_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(( " %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 == <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 == 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 ) ) |
!= FT_Err_Ok || |
( error = t1_builder_check_points( builder, 6 ) ) |
!= FT_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: |
/* <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 == 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: |
/* <arg1> <arg2> 2 20 callothersubr pop */ |
/* ==> push <arg1> + <arg2> 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: |
/* <arg1> <arg2> 2 21 callothersubr pop */ |
/* ==> push <arg1> - <arg2> 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: |
/* <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_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: |
/* <idx> 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: |
/* <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 %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 FT_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 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 += 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 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 ( ( error = t1_builder_start_point( builder, x, y ) ) |
!= FT_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 ) ) |
!= FT_Err_Ok || |
( error = t1_builder_check_points( builder, 3 ) ) |
!= FT_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 ) ) |
!= FT_Err_Ok ) |
goto Fail; |
|
x += top[0]; |
y += top[1]; |
|
Add_Line: |
if ( ( error = t1_builder_add_point1( builder, x, y ) ) |
!= FT_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 ) ) |
!= FT_Err_Ok || |
( error = t1_builder_check_points( builder, 3 ) ) |
!= FT_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 ) ) |
!= FT_Err_Ok || |
( error = t1_builder_check_points( builder, 3 ) ) |
!= FT_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 ) ) |
!= FT_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 FT_THROW( Syntax_Error ); |
|
Stack_Underflow: |
return FT_THROW( 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 FT_THROW( 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 FT_Err_Ok; |
} |
|
|
/* finalize T1 decoder */ |
FT_LOCAL_DEF( void ) |
t1_decoder_done( T1_Decoder decoder ) |
{ |
t1_builder_done( &decoder->builder ); |
} |
|
|
/* END */ |