/***************************************************************************/ /* */ /* z1gload.c */ /* */ /* Experimental Type 1 Glyph Loader (body). */ /* */ /* Copyright 1996-2000 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. */ /* */ /***************************************************************************/ #ifdef FT_FLAT_COMPILE #include "z1gload.h" #else #include #endif #include #include #include #include /* for strcmp() */ /*************************************************************************/ /* */ /* 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_z1gload typedef enum Z1_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 */ } Z1_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 */ }; /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** *********/ /********** GENERIC CHARSTRING PARSING *********/ /********** *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* Z1_Init_Builder */ /* */ /* */ /* Initializes a given glyph builder. */ /* */ /* */ /* builder :: A pointer to the glyph builder to initialize. */ /* */ /* */ /* face :: The current face object. */ /* */ /* size :: The current size object. */ /* */ /* glyph :: The current glyph object. */ /* */ LOCAL_FUNC void Z1_Init_Builder( Z1_Builder* builder, T1_Face face, Z1_Size size, Z1_GlyphSlot glyph ) { builder->path_begun = 0; builder->load_points = 1; builder->face = face; builder->glyph = glyph; builder->memory = face->root.memory; if ( glyph ) { FT_GlyphLoader* loader = glyph->root.loader; builder->loader = loader; builder->current = &loader->current.outline; builder->base = &loader->base.outline; FT_GlyphLoader_Rewind( loader ); } if ( size ) { builder->scale_x = size->root.metrics.x_scale; builder->scale_y = size->root.metrics.y_scale; } builder->pos_x = 0; builder->pos_y = 0; builder->left_bearing.x = 0; builder->left_bearing.y = 0; builder->advance.x = 0; builder->advance.y = 0; } /*************************************************************************/ /* */ /* */ /* Z1_Done_Builder */ /* */ /* */ /* Finalizes a given glyph builder. Its contents can still be used */ /* after the call, but the function saves important information */ /* within the corresponding glyph slot. */ /* */ /* */ /* builder :: A pointer to the glyph builder to finalize. */ /* */ LOCAL_FUNC void Z1_Done_Builder( Z1_Builder* builder ) { Z1_GlyphSlot glyph = builder->glyph; if ( glyph ) glyph->root.outline = *builder->base; } /*************************************************************************/ /* */ /* */ /* Z1_Init_Decoder */ /* */ /* */ /* Initializes a given glyph decoder. */ /* */ /* */ /* decoder :: A pointer to the glyph builder to initialize. */ /* */ LOCAL_FUNC void Z1_Init_Decoder( Z1_Decoder* decoder ) { decoder->top = 0; decoder->zone = 0; decoder->flex_state = 0; decoder->num_flex_vectors = 0; decoder->blend = 0; /* Clear loader */ MEM_Set( &decoder->builder, 0, sizeof ( decoder->builder ) ); } /* check that there is enough space for `count' more points */ static FT_Error check_points( Z1_Builder* builder, FT_Int count ) { return FT_GlyphLoader_Check_Points( builder->loader, count, 0 ); } /* add a new point; do not check space */ static void add_point( Z1_Builder* builder, FT_Pos x, FT_Pos y, FT_Byte flag ) { FT_Outline* outline = builder->current; if ( builder->load_points ) { FT_Vector* point = outline->points + outline->n_points; FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points; point->x = x; point->y = y; *control = flag ? FT_Curve_Tag_On : FT_Curve_Tag_Cubic; builder->last = *point; } outline->n_points++; } /* check space for a new on-curve point, then add it */ static FT_Error add_point1( Z1_Builder* builder, FT_Pos x, FT_Pos y ) { FT_Error error; error = check_points( builder, 1 ); if ( !error ) add_point( builder, x, y, 1 ); return error; } /* check space for a new contour, then add it */ static FT_Error add_contour( Z1_Builder* builder ) { FT_Outline* outline = builder->current; FT_Error error; if ( !builder->load_points ) { outline->n_contours++; return FT_Err_Ok; } /* reallocate contours array if necessary */ error = FT_GlyphLoader_Check_Points( builder->loader, 0, 1 ); if ( !error ) { if ( outline->n_contours > 0 ) outline->contours[outline->n_contours - 1] = outline->n_points - 1; outline->n_contours++; } return error; } /* if a path was begun, add its first on-curve point */ static FT_Error start_point( Z1_Builder* builder, FT_Pos x, FT_Pos y ) { /* test whether we are building a new contour */ if ( !builder->path_begun ) { FT_Error error; builder->path_begun = 1; error = add_contour( builder ); if ( error ) return error; } return add_point1( builder, x, y ); } /* close the current contour */ static void close_contour( Z1_Builder* builder ) { FT_Outline* outline = builder->current; /* XXX: we must not include the last point in the path if it */ /* is located on the first point */ if ( outline->n_points > 1 ) { FT_Int first = 0; FT_Vector* p1 = outline->points + first; FT_Vector* p2 = outline->points + outline->n_points-1; if ( outline->n_contours > 1 ) { first = outline->contours[outline->n_contours - 2] + 1; p1 = outline->points + first; } if ( p1->x == p2->x && p1->y == p2->y ) outline->n_points--; } if ( outline->n_contours > 0 ) outline->contours[outline->n_contours - 1] = outline->n_points - 1; } /*************************************************************************/ /* */ /* */ /* 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 lookup_glyph_by_stdcharcode( T1_Face face, FT_Int charcode ) { FT_Int n; const FT_String* glyph_name; PSNames_Interface* psnames = (PSNames_Interface*)face->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 < face->type1.num_glyphs; n++ ) { FT_String* name = (FT_String*)face->type1.glyph_names[n]; if ( name && 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( Z1_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; T1_Face face = decoder->builder.face; T1_Font* type1 = &face->type1; bchar_index = lookup_glyph_by_stdcharcode( face, bchar ); achar_index = lookup_glyph_by_stdcharcode( face, achar ); if ( bchar_index < 0 || achar_index < 0 ) { FT_ERROR(( "t1operator_seac:" )); FT_ERROR(( " invalid seac character code arguments\n" )); return T1_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->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 = Z1_Parse_CharStrings( decoder, type1->charstrings [bchar_index], type1->charstrings_len[bchar_index], type1->num_subrs, type1->subrs, type1->subrs_len ); 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 = Z1_Parse_CharStrings( decoder, type1->charstrings [achar_index], type1->charstrings_len[achar_index], type1->num_subrs, type1->subrs, type1->subrs_len ); if ( error ) return error; /* 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 = base->n_points - n_base_points; dummy.points = base->points + n_base_points; FT_Outline_Translate( &dummy, adx - asb, ady ); } Exit: return error; } #define USE_ARGS( n ) do \ { \ top -= n; \ if ( top < decoder->stack ) \ goto Stack_Underflow; \ } while ( 0 ) /*************************************************************************/ /* */ /* */ /* Z1_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. */ /* */ /* num_subrs :: The number of sub-routines. */ /* */ /* subrs_base :: An array of sub-routines addresses. */ /* */ /* subrs_len :: An array of sub-routines lengths. */ /* */ /* */ /* Free error code. 0 means success. */ /* */ LOCAL_FUNC FT_Error Z1_Parse_CharStrings( Z1_Decoder* decoder, FT_Byte* charstring_base, FT_Int charstring_len, FT_Int num_subrs, FT_Byte** subrs_base, FT_Int* subrs_len ) { FT_Error error; Z1_Decoder_Zone* zone; FT_Byte* ip; FT_Byte* limit; Z1_Builder* builder = &decoder->builder; FT_Outline* outline; FT_Pos x, y; /* 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 = T1_Err_Ok; outline = builder->current; x = builder->pos_x; y = builder->pos_y; /* now, execute loop */ while ( ip < limit ) { FT_Int* top = decoder->top; Z1_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(( "Z1_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(( "Z1_Parse_CharStrings: invalid escape (12+%d)\n", ip[-1] )); goto Syntax_Error; } break; case 255: /* four bytes integer */ if ( ip + 4 > limit ) { FT_ERROR(( "Z1_Parse_CharStrings: unexpected EOF in integer\n" )); goto Syntax_Error; } value = ( (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(( "Z1_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(( "Z1_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(( "Z1_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(( "Z1_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(( "Z1_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(( "Z1_Parse_CharStrings: invalid escape (12+%d)\n", ip[-1] )); goto Syntax_Error; } if ( ip[0] != 12 || ip[1] != 17 ) { FT_ERROR(( "Z1_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_Int* delta; FT_Int* values; if ( !blend ) { FT_ERROR(( "Z1_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(( "Z1_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 x = values[0]; for ( mm = 1; mm < blend->num_designs; mm++ ) x += FT_MulFix( *delta++, blend->weight_vector[mm] ); *values++ = x; } /* note that `top' will be incremented later by calls to `pop' */ break; } default: Unexpected_OtherSubr: FT_ERROR(( "Z1_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 T1_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 T1_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 T1_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]; 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]; 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]; break; case op_div: FT_TRACE4(( " div" )); if ( top[1] ) { *top = top[0] / top[1]; ++top; } else { FT_ERROR(( "Z1_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 >= num_subrs ) { FT_ERROR(( "Z1_Parse_CharStrings: invalid subrs index\n" )); goto Syntax_Error; } if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS ) { FT_ERROR(( "Z1_Parse_CharStrings: too many nested subrs\n" )); goto Syntax_Error; } zone->cursor = ip; /* save current instruction pointer */ zone++; zone->base = subrs_base[index]; zone->limit = zone->base + subrs_len[index]; zone->cursor = zone->base; if ( !zone->base ) { FT_ERROR(( "Z1_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" )); /* theorically, the arguments are already on the stack */ top++; break; case op_return: FT_TRACE4(( " return" )); if ( zone <= decoder->zones ) { FT_ERROR(( "Z1_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(( "Z1_Parse_CharStrings:" )); FT_ERROR(( " unexpected `setcurrentpoint'\n" )); goto Syntax_Error; default: FT_ERROR(( "Z1_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 T1_Err_Syntax_Error; Stack_Underflow: return T1_Err_Stack_Underflow; Memory_Error: return builder->error; } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ /********** *********/ /********** The following code is in charge of computing *********/ /********** the maximum advance width of the font. It *********/ /********** quickly processes each glyph charstring to *********/ /********** extract the value from either a `sbw' or `seac' *********/ /********** operator. *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ LOCAL_FUNC FT_Error Z1_Compute_Max_Advance( T1_Face face, FT_Int* max_advance ) { FT_Error error; Z1_Decoder decoder; FT_Int glyph_index; T1_Font* type1 = &face->type1; *max_advance = 0; /* Initialize load decoder */ Z1_Init_Decoder( &decoder ); Z1_Init_Builder( &decoder.builder, face, 0, 0 ); decoder.blend = face->blend; decoder.builder.metrics_only = 1; decoder.builder.load_points = 0; /* for each glyph, parse the glyph charstring and extract */ /* the advance width */ for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ ) { /* now get load the unscaled outline */ error = Z1_Parse_CharStrings( &decoder, type1->charstrings [glyph_index], type1->charstrings_len[glyph_index], type1->num_subrs, type1->subrs, type1->subrs_len ); /* ignore the error if one occured - skip to next glyph */ } *max_advance = decoder.builder.advance.x; return T1_Err_Ok; } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** UNHINTED GLYPH LOADER *********/ /********** *********/ /********** The following code is in charge of loading a *********/ /********** single outline. It completely ignores hinting *********/ /********** and is used when FT_LOAD_NO_HINTING is set. *********/ /********** *********/ /********** The Type 1 hinter is located in `t1hint.c' *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ LOCAL_FUNC FT_Error Z1_Load_Glyph( Z1_GlyphSlot glyph, Z1_Size size, FT_Int glyph_index, FT_Int load_flags ) { FT_Error error; Z1_Decoder decoder; T1_Face face = (T1_Face)glyph->root.face; FT_Bool hinting; T1_Font* type1 = &face->type1; if ( load_flags & FT_LOAD_NO_RECURSE ) load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; glyph->x_scale = size->root.metrics.x_scale; glyph->y_scale = size->root.metrics.y_scale; glyph->root.outline.n_points = 0; glyph->root.outline.n_contours = 0; hinting = ( load_flags & FT_LOAD_NO_SCALE ) == 0 && ( load_flags & FT_LOAD_NO_HINTING ) == 0; glyph->root.format = ft_glyph_format_outline; Z1_Init_Decoder( &decoder ); Z1_Init_Builder( &decoder.builder, face, size, glyph ); decoder.blend = ((T1_Face)glyph->root.face)->blend; decoder.builder.no_recurse = ( load_flags & FT_LOAD_NO_RECURSE ) != 0; /* now load the unscaled outline */ error = Z1_Parse_CharStrings( &decoder, type1->charstrings [glyph_index], type1->charstrings_len[glyph_index], type1->num_subrs, type1->subrs, type1->subrs_len ); /* save new glyph tables */ Z1_Done_Builder( &decoder.builder ); /* now, set the metrics -- this is rather simple, as */ /* the left side bearing is the xMin, and the top side */ /* bearing the yMax */ if ( !error ) { glyph->root.outline.flags &= ft_outline_owner; glyph->root.outline.flags |= ft_outline_reverse_fill; /* for composite glyphs, return only left side bearing and */ /* advance width */ if ( load_flags & FT_LOAD_NO_RECURSE ) { glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x; glyph->root.metrics.horiAdvance = decoder.builder.advance.x; } else { FT_BBox cbox; FT_Glyph_Metrics* metrics = &glyph->root.metrics; /* copy the _unscaled_ advance width */ metrics->horiAdvance = decoder.builder.advance.x; /* make up vertical metrics */ metrics->vertBearingX = 0; metrics->vertBearingY = 0; metrics->vertAdvance = 0; glyph->root.format = ft_glyph_format_outline; if ( size && size->root.metrics.y_ppem < 24 ) glyph->root.outline.flags |= ft_outline_high_precision; #if 0 glyph->root.outline.second_pass = TRUE; glyph->root.outline.high_precision = size->root.metrics.y_ppem < 24; glyph->root.outline.dropout_mode = 2; #endif /* 0 */ if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ) { /* scale the outline and the metrics */ FT_Int n; FT_Outline* cur = decoder.builder.base; FT_Vector* vec = cur->points; FT_Fixed x_scale = glyph->x_scale; FT_Fixed y_scale = glyph->y_scale; /* First of all, scale the points */ for ( n = cur->n_points; n > 0; n--, vec++ ) { vec->x = FT_MulFix( vec->x, x_scale ); vec->y = FT_MulFix( vec->y, y_scale ); } FT_Outline_Get_CBox( &glyph->root.outline, &cbox ); /* Then scale the metrics */ metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale ); metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale ); } /* apply the font matrix */ FT_Outline_Transform( &glyph->root.outline, &face->type1.font_matrix ); /* compute the other metrics */ FT_Outline_Get_CBox( &glyph->root.outline, &cbox ); /* grid fit the bounding box if necessary */ if ( hinting ) { cbox.xMin &= -64; cbox.yMin &= -64; cbox.xMax = ( cbox.xMax+63 ) & -64; cbox.yMax = ( cbox.yMax+63 ) & -64; } metrics->width = cbox.xMax - cbox.xMin; metrics->height = cbox.yMax - cbox.yMin; metrics->horiBearingX = cbox.xMin; metrics->horiBearingY = cbox.yMax; } } return error; } /* END */