--- /dev/null
+/***************************************************************************/
+/* */
+/* t1decode.c */
+/* */
+/* PostScript Type 1 decoding routines (body). */
+/* */
+/* Copyright 2000-2001 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_DEBUG_H
+#include FT_OUTLINE_H
+
+#include "t1decode.h"
+#include "psobjs.h"
+
+#include "psauxerr.h"
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_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_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 */
+ };
+
+
+ /*************************************************************************/
+ /* */
+ /* <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;
+ PSNames_Interface* 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 && 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, n_base_points;
+ FT_Outline* base = decoder->builder.base;
+ FT_Vector left_bearing, advance;
+
+
+ /* 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? */
+ if ( decoder->glyph_names == 0 )
+ {
+ FT_ERROR(( "t1operator_seac:" ));
+ FT_ERROR(( " glyph names table not available in this font!\n" ));
+ return PSaux_Err_Syntax_Error;
+ }
+
+ 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:" ));
+ FT_ERROR(( " 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_Check_Subglyphs( 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 = adx - asb;
+ subg->arg2 = 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;
+ }
+
+ /* First load `bchar' in builder */
+ /* now load the unscaled outline */
+
+ FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */
+
+ error = T1_Decoder_Parse_Glyph( decoder, bchar_index );
+ if ( error )
+ goto Exit;
+
+ n_base_points = base->n_points;
+
+ /* 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;
+
+ /* Now load `achar' on top of */
+ /* the base outline */
+ error = T1_Decoder_Parse_Glyph( decoder, achar_index );
+ 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;
+
+ /* Finally, move the accent */
+ if ( decoder->builder.load_points )
+ {
+ FT_Outline dummy;
+
+
+ dummy.n_points = (short)( base->n_points - n_base_points );
+ dummy.points = base->points + n_base_points;
+
+ FT_Outline_Translate( &dummy, adx - asb, ady );
+ }
+
+ 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;
+
+
+ /* we don't want to touch the source code -- use macro trick */
+#define start_point T1_Builder_Start_Point
+#define check_points T1_Builder_Check_Points
+#define add_point T1_Builder_Add_Point
+#define add_point1 T1_Builder_Add_Point1
+#define add_contour T1_Builder_Add_Contour
+#define close_contour T1_Builder_Close_Contour
+
+ /* First of all, initialize the decoder */
+ decoder->top = decoder->stack;
+ decoder->zone = decoder->zones;
+ zone = decoder->zones;
+
+ builder->path_begun = 0;
+
+ zone->base = charstring_base;
+ limit = zone->limit = charstring_base + charstring_len;
+ ip = zone->cursor = zone->base;
+
+ error = PSaux_Err_Ok;
+
+ x = builder->pos_x;
+ y = builder->pos_y;
+
+ /* now, execute loop */
+ while ( ip < limit )
+ {
+ FT_Long* top = decoder->top;
+ T1_Operator op = op_none;
+ FT_Long value = 0;
+
+
+ /*********************************************************************/
+ /* */
+ /* 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 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;
+ break;
+
+ default:
+ if ( ip[-1] >= 32 )
+ {
+ if ( ip[-1] < 247 )
+ value = (FT_Long)ip[-1] - 139;
+ else
+ {
+ if ( ++ip > limit )
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
+ FT_ERROR(( "unexpected EOF in integer\n" ));
+ goto Syntax_Error;
+ }
+
+ if ( ip[-2] < 251 )
+ value = ( ( (FT_Long)ip[-2] - 247 ) << 8 ) + ip[-1] + 108;
+ else
+ value = -( ( ( (FT_Long)ip[-2] - 251 ) << 8 ) + ip[-1] + 108 );
+ }
+ }
+ else
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
+ "invalid byte (%d)\n", ip[-1] ));
+ goto Syntax_Error;
+ }
+ }
+
+ /*********************************************************************/
+ /* */
+ /* 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;
+ }
+
+ FT_TRACE4(( " %ld", value ));
+
+ *top++ = value;
+ decoder->top = top;
+ }
+ else if ( op == op_callothersubr ) /* callothersubr */
+ {
+ FT_TRACE4(( " callothersubr" ));
+
+ if ( top - decoder->stack < 2 )
+ goto Stack_Underflow;
+
+ top -= 2;
+ switch ( top[1] )
+ {
+ case 1: /* start flex feature */
+ if ( top[0] != 0 )
+ goto Unexpected_OtherSubr;
+
+ decoder->flex_state = 1;
+ decoder->num_flex_vectors = 0;
+ if ( start_point( builder, x, y ) ||
+ check_points( builder, 6 ) )
+ goto Memory_Error;
+ break;
+
+ case 2: /* add flex vectors */
+ {
+ FT_Int index;
+
+ if ( top[0] != 0 )
+ goto Unexpected_OtherSubr;
+
+ /* 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 */
+ index = decoder->num_flex_vectors++;
+ if ( index > 0 && index < 7 )
+ add_point( builder,
+ x,
+ y,
+ (FT_Byte)( index == 3 || index == 6 ) );
+ }
+ break;
+
+ case 0: /* end flex feature */
+ if ( top[0] != 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;
+ }
+
+ /* now consume the remaining `pop pop setcurpoint' */
+ if ( ip + 6 > limit ||
+ ip[0] != 12 || ip[1] != 17 || /* pop */
+ ip[2] != 12 || ip[3] != 17 || /* pop */
+ ip[4] != 12 || ip[5] != 33 ) /* setcurpoint */
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
+ "invalid flex charstring\n" ));
+ goto Syntax_Error;
+ }
+
+ ip += 6;
+ decoder->flex_state = 0;
+ break;
+
+ case 3: /* change hints */
+ if ( top[0] != 1 )
+ goto Unexpected_OtherSubr;
+
+ /* eat the following `pop' */
+ if ( ip + 2 > limit )
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
+ "invalid escape (12+%d)\n", ip[-1] ));
+ goto Syntax_Error;
+ }
+
+ if ( ip[0] != 12 || ip[1] != 17 )
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
+ FT_ERROR(( "`pop' expected, found (%d %d)\n", ip[0], ip[1] ));
+ goto Syntax_Error;
+ }
+ ip += 2;
+ 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 */
+ {
+ T1_Blend* blend = decoder->blend;
+ FT_UInt num_points, nn, mm;
+ FT_Long* delta;
+ FT_Long* values;
+
+
+ if ( !blend )
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
+ FT_ERROR(( "unexpected multiple masters operator!\n" ));
+ goto Syntax_Error;
+ }
+
+ num_points = top[1] - 13 + ( top[1] == 18 );
+ if ( top[0] != (FT_Int)( num_points * blend->num_designs ) )
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
+ FT_ERROR(( "incorrect number of mm arguments\n" ));
+ goto Syntax_Error;
+ }
+
+ top -= blend->num_designs*num_points;
+ if ( top < decoder->stack )
+ goto Stack_Underflow;
+
+ /* we want to compute: */
+ /* */
+ /* a0*w0 + a1*w1 + ... + ak*wk */
+ /* */
+ /* but we only have the 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_Int tmp = values[0];
+
+
+ for ( mm = 1; mm < blend->num_designs; mm++ )
+ tmp += FT_MulFix( *delta++, blend->weight_vector[mm] );
+
+ *values++ = tmp;
+ }
+ /* note that `top' will be incremented later by calls to `pop' */
+ break;
+ }
+
+ default:
+ Unexpected_OtherSubr:
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
+ "invalid othersubr [%d %d]!\n", top[0], top[1] ));
+ goto Syntax_Error;
+ }
+ decoder->top = top;
+ }
+ else /* general operator */
+ {
+ FT_Int num_args = t1_args_count[op];
+
+
+ if ( top - decoder->stack < num_args )
+ goto Stack_Underflow;
+
+ top -= num_args;
+
+ switch ( op )
+ {
+ case op_endchar:
+ FT_TRACE4(( " endchar" ));
+
+ close_contour( builder );
+
+ /* add current outline to the glyph slot */
+ FT_GlyphLoader_Add( builder->loader );
+
+ /* return now! */
+ FT_TRACE4(( "\n\n" ));
+ return PSaux_Err_Ok;
+
+ case op_hsbw:
+ FT_TRACE4(( " hsbw" ));
+
+ builder->left_bearing.x += top[0];
+ builder->advance.x = top[1];
+ builder->advance.y = 0;
+
+ builder->last.x = x = top[0];
+ builder->last.y = y = 0;
+
+ /* 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 immediately after the processing */
+ return t1operator_seac( decoder, top[0], top[1],
+ top[2], top[3], top[4] );
+
+ case op_sbw:
+ FT_TRACE4(( " sbw" ));
+
+ builder->left_bearing.x += top[0];
+ builder->left_bearing.y += top[1];
+ builder->advance.x = top[2];
+ builder->advance.y = top[3];
+
+ builder->last.x = x = top[0];
+ builder->last.y = 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" ));
+
+ close_contour( builder );
+ builder->path_begun = 0;
+ break;
+
+ case op_hlineto:
+ FT_TRACE4(( " hlineto" ));
+
+ if ( start_point( builder, x, y ) )
+ goto Memory_Error;
+
+ x += top[0];
+ goto Add_Line;
+
+ case op_hmoveto:
+ FT_TRACE4(( " hmoveto" ));
+
+ x += top[0];
+ if ( !decoder->flex_state )
+ builder->path_begun = 0;
+ break;
+
+ case op_hvcurveto:
+ FT_TRACE4(( " hvcurveto" ));
+
+ if ( start_point( builder, x, y ) ||
+ check_points( builder, 3 ) )
+ goto Memory_Error;
+
+ x += top[0];
+ add_point( builder, x, y, 0 );
+ x += top[1];
+ y += top[2];
+ add_point( builder, x, y, 0 );
+ y += top[3];
+ add_point( builder, x, y, 1 );
+ break;
+
+ case op_rlineto:
+ FT_TRACE4(( " rlineto" ));
+
+ if ( start_point( builder, x, y ) )
+ goto Memory_Error;
+
+ x += top[0];
+ y += top[1];
+
+ Add_Line:
+ if ( add_point1( builder, x, y ) )
+ goto Memory_Error;
+ break;
+
+ case op_rmoveto:
+ FT_TRACE4(( " rmoveto" ));
+
+ x += top[0];
+ y += top[1];
+ if ( !decoder->flex_state )
+ builder->path_begun = 0;
+ break;
+
+ case op_rrcurveto:
+ FT_TRACE4(( " rcurveto" ));
+
+ if ( start_point( builder, x, y ) ||
+ check_points( builder, 3 ) )
+ goto Memory_Error;
+
+ x += top[0];
+ y += top[1];
+ add_point( builder, x, y, 0 );
+
+ x += top[2];
+ y += top[3];
+ add_point( builder, x, y, 0 );
+
+ x += top[4];
+ y += top[5];
+ add_point( builder, x, y, 1 );
+ break;
+
+ case op_vhcurveto:
+ FT_TRACE4(( " vhcurveto" ));
+
+ if ( start_point( builder, x, y ) ||
+ check_points( builder, 3 ) )
+ goto Memory_Error;
+
+ y += top[0];
+ add_point( builder, x, y, 0 );
+ x += top[1];
+ y += top[2];
+ add_point( builder, x, y, 0 );
+ x += top[3];
+ add_point( builder, x, y, 1 );
+ break;
+
+ case op_vlineto:
+ FT_TRACE4(( " vlineto" ));
+
+ if ( start_point( builder, x, y ) )
+ goto Memory_Error;
+
+ y += top[0];
+ goto Add_Line;
+
+ case op_vmoveto:
+ FT_TRACE4(( " vmoveto" ));
+
+ y += top[0];
+ if ( !decoder->flex_state )
+ builder->path_begun = 0;
+ break;
+
+ case op_div:
+ FT_TRACE4(( " div" ));
+
+ if ( top[1] )
+ {
+ *top = top[0] / top[1];
+ ++top;
+ }
+ else
+ {
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: division by 0\n" ));
+ goto Syntax_Error;
+ }
+ break;
+
+ case op_callsubr:
+ {
+ FT_Int index;
+
+
+ FT_TRACE4(( " callsubr" ));
+
+ index = top[0];
+ if ( index < 0 || index >= (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[index];
+
+ if ( decoder->subrs_len )
+ zone->limit = zone->base + decoder->subrs_len[index];
+ 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[index + 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" ));
+
+ /* theoretically, the arguments are already on the stack */
+ top++;
+ 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" ));
+
+ break;
+
+ case op_hstem3:
+ FT_TRACE4(( " hstem3" ));
+
+ break;
+
+ case op_vstem:
+ FT_TRACE4(( " vstem" ));
+
+ break;
+
+ case op_vstem3:
+ FT_TRACE4(( " vstem3" ));
+
+ break;
+
+ case op_setcurrentpoint:
+ FT_TRACE4(( " setcurrentpoint" ));
+
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
+ FT_ERROR(( "unexpected `setcurrentpoint'\n" ));
+ goto Syntax_Error;
+
+ default:
+ FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
+ "unhandled opcode %d\n", op ));
+ goto Syntax_Error;
+ }
+
+ decoder->top = top;
+
+ } /* general operator processing */
+
+ } /* while ip < limit */
+
+ FT_TRACE4(( "..end..\n\n" ));
+ return error;
+
+ Syntax_Error:
+ return PSaux_Err_Syntax_Error;
+
+ Stack_Underflow:
+ return PSaux_Err_Stack_Underflow;
+
+ Memory_Error:
+ return builder->error;
+ }
+
+
+ FT_LOCAL_DEF FT_Error
+ T1_Decoder_Parse_Glyph( T1_Decoder* decoder,
+ FT_UInt glyph )
+ {
+ return decoder->parse_callback( decoder, glyph );
+ }
+
+
+ FT_LOCAL_DEF FT_Error
+ T1_Decoder_Init( T1_Decoder* decoder,
+ FT_Face face,
+ FT_Size size,
+ FT_GlyphSlot slot,
+ FT_Byte** glyph_names,
+ T1_Blend* blend,
+ T1_Decoder_Callback parse_callback )
+ {
+ MEM_Set( decoder, 0, sizeof ( *decoder ) );
+
+ /* retrieve PSNames interface from list of current modules */
+ {
+ PSNames_Interface* psnames = 0;
+
+
+ psnames = (PSNames_Interface*)FT_Get_Module_Interface(
+ FT_FACE_LIBRARY(face), "psnames" );
+ if ( !psnames )
+ {
+ FT_ERROR(( "T1_Decoder_Init: " ));
+ FT_ERROR(( "the `psnames' module is not available\n" ));
+ return PSaux_Err_Unimplemented_Feature;
+ }
+
+ decoder->psnames = psnames;
+ }
+ T1_Builder_Init( &decoder->builder, face, size, slot );
+
+ decoder->num_glyphs = face->num_glyphs;
+ decoder->glyph_names = glyph_names;
+ decoder->blend = blend;
+ decoder->parse_callback = parse_callback;
+
+ decoder->funcs = t1_decoder_funcs;
+
+ return 0;
+ }
+
+
+ FT_LOCAL_DEF void
+ T1_Decoder_Done( T1_Decoder* decoder )
+ {
+ T1_Builder_Done( &decoder->builder );
+ }
+
+
+/* END */
projects / rrdtool.git / blobdiff