ref: ab840e6a4c26bf1b2e6833911c9f761ac45e24e5
dir: /src/psaux/t1decode.c/
/***************************************************************************/
/* */
/* t1decode.c */
/* */
/* PostScript Type 1 decoding routines (body). */
/* */
/* Copyright 2000-2017 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_INTERNAL_HASH_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 (FT_Int)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, (FT_UInt)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, (FT_UInt)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_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 );
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(( " %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 )
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 += 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] += 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 )
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 )
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,
(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(( "%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 ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) )
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 ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) ||
FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) )
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 ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) )
goto Fail;
x += top[0];
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 += 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 ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) ||
FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) )
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 ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) ||
FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) )
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 ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) )
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 ( 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] += 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_ZERO( decoder );
/* retrieve PSNames interface from list of current modules */
{
FT_Service_PsCMaps psnames;
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 */