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author | Bram Tassyns <bramt@enfocus.be> | 2009-11-04 07:21:15 +0100 |
---|---|---|
committer | Werner Lemberg <wl@gnu.org> | 2009-11-04 07:21:15 +0100 |
commit | 8821cc5df1dd0726a25a3036ac56d132f1f15f5c (patch) | |
tree | c552a23f955b092e3b6a6ffccc45364ac48725bc /src/cff/cffgload.c | |
parent | f186ba682d72cc38bc0dc09b07cdd5ef6cf98482 (diff) | |
download | freetype2-8821cc5df1dd0726a25a3036ac56d132f1f15f5c.tar.gz |
Add basic support for Type1 charstrings in CFF.
* src/cff/cffgload.c (CFF_Operator, cff_argument_counts): Handle
`seac', `sbw', and `setcurrentpoint' opcodes.
(cff_compute_bias): Add parameter to indicate the charstring type.
Update all callers.
(cff_operator_seac): Add parameter for side bearing.
(cff_decoder_parse_charstrings): Updated for more Type1 support.
Diffstat (limited to 'src/cff/cffgload.c')
-rw-r--r-- | src/cff/cffgload.c | 133 |
1 files changed, 111 insertions, 22 deletions
diff --git a/src/cff/cffgload.c b/src/cff/cffgload.c index 4cabc4cc7..8f64060b6 100644 --- a/src/cff/cffgload.c +++ b/src/cff/cffgload.c @@ -113,6 +113,9 @@ cff_op_closepath, cff_op_callothersubr, cff_op_pop, + cff_op_seac, + cff_op_sbw, + cff_op_setcurrentpoint, /* do not remove */ cff_op_max @@ -201,7 +204,10 @@ 2, /* hsbw */ 0, 0, - 0 + 0, + 5, /* seac */ + 4, /* sbw */ + 2 /* setcurrentpoint */ }; @@ -319,17 +325,23 @@ /* subroutines. */ /* */ /* <Input> */ - /* num_subrs :: The number of glyph subroutines. */ + /* in_charstring_type :: The `CharstringType' value of the top DICT */ + /* dictionary. */ + /* */ + /* num_subrs :: The number of glyph subroutines. */ /* */ /* <Return> */ /* The bias value. */ static FT_Int - cff_compute_bias( FT_UInt num_subrs ) + cff_compute_bias( FT_Int in_charstring_type, + FT_UInt num_subrs ) { FT_Int result; - if ( num_subrs < 1240 ) + if ( in_charstring_type == 1 ) + result = 0; + else if ( num_subrs < 1240 ) result = 107; else if ( num_subrs < 33900U ) result = 1131; @@ -380,9 +392,12 @@ cff_builder_init( &decoder->builder, face, size, slot, hinting ); /* initialize Type2 decoder */ + decoder->cff = cff; decoder->num_globals = cff->num_global_subrs; decoder->globals = cff->global_subrs; - decoder->globals_bias = cff_compute_bias( decoder->num_globals ); + decoder->globals_bias = cff_compute_bias( + cff->top_font.font_dict.charstring_type, + decoder->num_globals ); decoder->hint_mode = hint_mode; } @@ -434,7 +449,9 @@ decoder->num_locals = sub->num_local_subrs; decoder->locals = sub->local_subrs; - decoder->locals_bias = cff_compute_bias( decoder->num_locals ); + decoder->locals_bias = cff_compute_bias( + decoder->cff->top_font.font_dict.charstring_type, + decoder->num_locals ); decoder->glyph_width = sub->private_dict.default_width; decoder->nominal_width = sub->private_dict.nominal_width; @@ -693,6 +710,7 @@ static FT_Error cff_operator_seac( CFF_Decoder* decoder, + FT_Pos asb, FT_Pos adx, FT_Pos ady, FT_Int bchar, @@ -705,6 +723,7 @@ FT_Vector left_bearing, advance; FT_Byte* charstring; FT_ULong charstring_len; + FT_Pos glyph_width; if ( decoder->seac ) @@ -713,6 +732,9 @@ return CFF_Err_Syntax_Error; } + adx += decoder->builder.left_bearing.x; + ady += decoder->builder.left_bearing.y; + #ifdef FT_CONFIG_OPTION_INCREMENTAL /* Incremental fonts don't necessarily have valid charsets. */ /* They use the character code, not the glyph index, in this case. */ @@ -795,16 +817,17 @@ cff_free_glyph_data( face, &charstring, charstring_len ); } - /* Save the left bearing and width of the base character */ - /* as they will be erased by the next load. */ + /* Save the left bearing, advance and glyph width of the base */ + /* character as they will be erased by the next load. */ left_bearing = builder->left_bearing; advance = builder->advance; + glyph_width = decoder->glyph_width; builder->left_bearing.x = 0; builder->left_bearing.y = 0; - builder->pos_x = adx; + builder->pos_x = adx - asb; builder->pos_y = ady; /* Now load `achar' on top of the base outline. */ @@ -824,10 +847,11 @@ cff_free_glyph_data( face, &charstring, charstring_len ); } - /* Restore the left side bearing and advance width */ - /* of the base character. */ + /* Restore the left side bearing, advance and glyph width */ + /* of the base character. */ builder->left_bearing = left_bearing; builder->advance = advance; + decoder->glyph_width = glyph_width; builder->pos_x = 0; builder->pos_y = 0; @@ -869,6 +893,8 @@ FT_Pos x, y; FT_Fixed seed; FT_Fixed* stack; + FT_Int charstring_type = + decoder->cff->top_font.font_dict.charstring_type; T2_Hints_Funcs hinter; @@ -958,7 +984,8 @@ ( (FT_Int32)ip[2] << 8 ) | ip[3]; ip += 4; - shift = 0; + if ( charstring_type == 2 ) + shift = 0; } if ( decoder->top - stack >= CFF_MAX_OPERANDS ) goto Stack_Overflow; @@ -1032,6 +1059,12 @@ case 0: op = cff_op_dotsection; break; + case 1: /* this is actually the Type1 vstem3 operator */ + op = cff_op_vstem; + break; + case 2: /* this is actually the Type1 hstem3 operator */ + op = cff_op_hstem; + break; case 3: op = cff_op_and; break; @@ -1041,6 +1074,12 @@ case 5: op = cff_op_not; break; + case 6: + op = cff_op_seac; + break; + case 7: + op = cff_op_sbw; + break; case 8: op = cff_op_store; break; @@ -1104,6 +1143,9 @@ case 30: op = cff_op_roll; break; + case 33: + op = cff_op_setcurrentpoint; + break; case 34: op = cff_op_hflex; break; @@ -1171,7 +1213,7 @@ op = cff_op_hvcurveto; break; default: - ; + break; } if ( op == cff_op_unknown ) @@ -1886,6 +1928,21 @@ } break; + case cff_op_seac: + FT_TRACE4(( " seac\n" )); + + error = cff_operator_seac( decoder, + args[0], args[1], args[2], + (FT_Int)( args[3] >> 16 ), + (FT_Int)( args[4] >> 16 ) ); + + /* add current outline to the glyph slot */ + FT_GlyphLoader_Add( builder->loader ); + + /* return now! */ + FT_TRACE4(( "\n" )); + return error; + case cff_op_endchar: FT_TRACE4(( " endchar\n" )); @@ -1895,10 +1952,8 @@ /* Save glyph width so that the subglyphs don't overwrite it. */ FT_Pos glyph_width = decoder->glyph_width; - error = cff_operator_seac( decoder, - args[-4], - args[-3], + 0L, args[-4], args[-3], (FT_Int)( args[-2] >> 16 ), (FT_Int)( args[-1] >> 16 ) ); @@ -2170,10 +2225,42 @@ FT_TRACE4(( " hsbw (invalid op)\n" )); - decoder->glyph_width = decoder->nominal_width + - (args[1] >> 16); - x = args[0]; - y = 0; + decoder->glyph_width = decoder->nominal_width + ( args[1] >> 16 ); + + decoder->builder.left_bearing.x = args[0]; + decoder->builder.left_bearing.y = 0; + + x = decoder->builder.pos_x + args[0]; + y = decoder->builder.pos_y; + args = stack; + break; + + case cff_op_sbw: + /* this is an invalid Type 2 operator; however, there */ + /* exist fonts which are incorrectly converted from probably */ + /* Type 1 to CFF, and some parsers seem to accept it */ + + FT_TRACE4(( " sbw (invalid op)\n" )); + + decoder->glyph_width = decoder->nominal_width + ( args[2] >> 16 ); + + decoder->builder.left_bearing.x = args[0]; + decoder->builder.left_bearing.y = args[1]; + + x = decoder->builder.pos_x + args[0]; + y = decoder->builder.pos_y + args[1]; + args = stack; + break; + + case cff_op_setcurrentpoint: + /* this is an invalid Type 2 operator; however, there */ + /* exist fonts which are incorrectly converted from probably */ + /* Type 1 to CFF, and some parsers seem to accept it */ + + FT_TRACE4(( " setcurrentpoint (invalid op)\n" )); + + x = decoder->builder.pos_x + args[0]; + y = decoder->builder.pos_y + args[1]; args = stack; break; @@ -2184,8 +2271,10 @@ FT_TRACE4(( " callothersubr (invalid op)\n" )); - /* don't modify stack; handle the subr as `unknown' so that */ - /* following `pop' operands use the arguments on stack */ + /* subsequent `pop' operands should add the arguments, */ + /* this is the implementation described for `unknown' other */ + /* subroutines in the Type1 spec. */ + args -= 2 + ( args[-2] >> 16 ); break; case cff_op_pop: |