1 /***************************************************************************/
2 /* */
3 /* t1decode.c */
4 /* */
5 /* PostScript Type 1 decoding routines (body). */
6 /* */
7 /* Copyright 2000-2001 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
19 #include <ft2build.h>
20 #include FT_INTERNAL_DEBUG_H
21 #include FT_OUTLINE_H
23 #include "t1decode.h"
24 #include "psobjs.h"
26 #include "psauxerr.h"
29 /*************************************************************************/
30 /* */
31 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
32 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
33 /* messages during execution. */
34 /* */
35 #undef FT_COMPONENT
36 #define FT_COMPONENT trace_t1decode
39 typedef enum T1_Operator_
40 {
41 op_none = 0,
42 op_endchar,
43 op_hsbw,
44 op_seac,
45 op_sbw,
46 op_closepath,
47 op_hlineto,
48 op_hmoveto,
49 op_hvcurveto,
50 op_rlineto,
51 op_rmoveto,
52 op_rrcurveto,
53 op_vhcurveto,
54 op_vlineto,
55 op_vmoveto,
56 op_dotsection,
57 op_hstem,
58 op_hstem3,
59 op_vstem,
60 op_vstem3,
61 op_div,
62 op_callothersubr,
63 op_callsubr,
64 op_pop,
65 op_return,
66 op_setcurrentpoint,
68 op_max /* never remove this one */
70 } T1_Operator;
72 static
73 const FT_Int t1_args_count[op_max] =
74 {
75 0, /* none */
76 0, /* endchar */
77 2, /* hsbw */
78 5, /* seac */
79 4, /* sbw */
80 0, /* closepath */
81 1, /* hlineto */
82 1, /* hmoveto */
83 4, /* hvcurveto */
84 2, /* rlineto */
85 2, /* rmoveto */
86 6, /* rrcurveto */
87 4, /* vhcurveto */
88 1, /* vlineto */
89 1, /* vmoveto */
90 0, /* dotsection */
91 2, /* hstem */
92 6, /* hstem3 */
93 2, /* vstem */
94 6, /* vstem3 */
95 2, /* div */
96 -1, /* callothersubr */
97 1, /* callsubr */
98 0, /* pop */
99 0, /* return */
100 2 /* setcurrentpoint */
101 };
104 /*************************************************************************/
105 /* */
106 /* <Function> */
107 /* t1_lookup_glyph_by_stdcharcode */
108 /* */
109 /* <Description> */
110 /* Looks up a given glyph by its StandardEncoding charcode. Used to */
111 /* implement the SEAC Type 1 operator. */
112 /* */
113 /* <Input> */
114 /* face :: The current face object. */
115 /* */
116 /* charcode :: The character code to look for. */
117 /* */
118 /* <Return> */
119 /* A glyph index in the font face. Returns -1 if the corresponding */
120 /* glyph wasn't found. */
121 /* */
122 static FT_Int
123 t1_lookup_glyph_by_stdcharcode( T1_Decoder* decoder,
124 FT_Int charcode )
125 {
126 FT_UInt n;
127 const FT_String* glyph_name;
128 PSNames_Interface* psnames = decoder->psnames;
131 /* check range of standard char code */
132 if ( charcode < 0 || charcode > 255 )
133 return -1;
135 glyph_name = psnames->adobe_std_strings(
136 psnames->adobe_std_encoding[charcode]);
138 for ( n = 0; n < decoder->num_glyphs; n++ )
139 {
140 FT_String* name = (FT_String*)decoder->glyph_names[n];
143 if ( name && strcmp( name,glyph_name ) == 0 )
144 return n;
145 }
147 return -1;
148 }
151 /*************************************************************************/
152 /* */
153 /* <Function> */
154 /* t1operator_seac */
155 /* */
156 /* <Description> */
157 /* Implements the `seac' Type 1 operator for a Type 1 decoder. */
158 /* */
159 /* <Input> */
160 /* decoder :: The current CID decoder. */
161 /* */
162 /* asb :: The accent's side bearing. */
163 /* */
164 /* adx :: The horizontal offset of the accent. */
165 /* */
166 /* ady :: The vertical offset of the accent. */
167 /* */
168 /* bchar :: The base character's StandardEncoding charcode. */
169 /* */
170 /* achar :: The accent character's StandardEncoding charcode. */
171 /* */
172 /* <Return> */
173 /* FreeType error code. 0 means success. */
174 /* */
175 static FT_Error
176 t1operator_seac( T1_Decoder* decoder,
177 FT_Pos asb,
178 FT_Pos adx,
179 FT_Pos ady,
180 FT_Int bchar,
181 FT_Int achar )
182 {
183 FT_Error error;
184 FT_Int bchar_index, achar_index, n_base_points;
185 FT_Outline* base = decoder->builder.base;
186 FT_Vector left_bearing, advance;
189 /* seac weirdness */
190 adx += decoder->builder.left_bearing.x;
192 /* `glyph_names' is set to 0 for CID fonts which do not */
193 /* include an encoding. How can we deal with these? */
194 if ( decoder->glyph_names == 0 )
195 {
196 FT_ERROR(( "t1operator_seac:" ));
197 FT_ERROR(( " glyph names table not available in this font!\n" ));
198 return PSaux_Err_Syntax_Error;
199 }
201 bchar_index = t1_lookup_glyph_by_stdcharcode( decoder, bchar );
202 achar_index = t1_lookup_glyph_by_stdcharcode( decoder, achar );
204 if ( bchar_index < 0 || achar_index < 0 )
205 {
206 FT_ERROR(( "t1operator_seac:" ));
207 FT_ERROR(( " invalid seac character code arguments\n" ));
208 return PSaux_Err_Syntax_Error;
209 }
211 /* if we are trying to load a composite glyph, do not load the */
212 /* accent character and return the array of subglyphs. */
213 if ( decoder->builder.no_recurse )
214 {
215 FT_GlyphSlot glyph = (FT_GlyphSlot)decoder->builder.glyph;
216 FT_GlyphLoader* loader = glyph->internal->loader;
217 FT_SubGlyph* subg;
220 /* reallocate subglyph array if necessary */
221 error = FT_GlyphLoader_Check_Subglyphs( loader, 2 );
222 if ( error )
223 goto Exit;
225 subg = loader->current.subglyphs;
227 /* subglyph 0 = base character */
228 subg->index = bchar_index;
229 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES |
230 FT_SUBGLYPH_FLAG_USE_MY_METRICS;
231 subg->arg1 = 0;
232 subg->arg2 = 0;
233 subg++;
235 /* subglyph 1 = accent character */
236 subg->index = achar_index;
237 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES;
238 subg->arg1 = adx - asb;
239 subg->arg2 = ady;
241 /* set up remaining glyph fields */
242 glyph->num_subglyphs = 2;
243 glyph->subglyphs = loader->base.subglyphs;
244 glyph->format = ft_glyph_format_composite;
246 loader->current.num_subglyphs = 2;
247 }
249 /* First load `bchar' in builder */
250 /* now load the unscaled outline */
252 FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */
254 error = T1_Decoder_Parse_Glyph( decoder, bchar_index );
255 if ( error )
256 goto Exit;
258 n_base_points = base->n_points;
260 /* save the left bearing and width of the base character */
261 /* as they will be erased by the next load. */
263 left_bearing = decoder->builder.left_bearing;
264 advance = decoder->builder.advance;
266 decoder->builder.left_bearing.x = 0;
267 decoder->builder.left_bearing.y = 0;
269 /* Now load `achar' on top of */
270 /* the base outline */
271 error = T1_Decoder_Parse_Glyph( decoder, achar_index );
272 if ( error )
273 goto Exit;
275 /* restore the left side bearing and */
276 /* advance width of the base character */
278 decoder->builder.left_bearing = left_bearing;
279 decoder->builder.advance = advance;
281 /* Finally, move the accent */
282 if ( decoder->builder.load_points )
283 {
284 FT_Outline dummy;
287 dummy.n_points = (short)( base->n_points - n_base_points );
288 dummy.points = base->points + n_base_points;
290 FT_Outline_Translate( &dummy, adx - asb, ady );
291 }
293 Exit:
294 return error;
295 }
298 /*************************************************************************/
299 /* */
300 /* <Function> */
301 /* T1_Decoder_Parse_Charstrings */
302 /* */
303 /* <Description> */
304 /* Parses a given Type 1 charstrings program. */
305 /* */
306 /* <Input> */
307 /* decoder :: The current Type 1 decoder. */
308 /* */
309 /* charstring_base :: The base address of the charstring stream. */
310 /* */
311 /* charstring_len :: The length in bytes of the charstring stream. */
312 /* */
313 /* <Return> */
314 /* FreeType error code. 0 means success. */
315 /* */
316 FT_LOCAL_DEF FT_Error
317 T1_Decoder_Parse_Charstrings( T1_Decoder* decoder,
318 FT_Byte* charstring_base,
319 FT_UInt charstring_len )
320 {
321 FT_Error error;
322 T1_Decoder_Zone* zone;
323 FT_Byte* ip;
324 FT_Byte* limit;
325 T1_Builder* builder = &decoder->builder;
326 FT_Pos x, y;
329 /* we don't want to touch the source code -- use macro trick */
330 #define start_point T1_Builder_Start_Point
331 #define check_points T1_Builder_Check_Points
332 #define add_point T1_Builder_Add_Point
333 #define add_point1 T1_Builder_Add_Point1
334 #define add_contour T1_Builder_Add_Contour
335 #define close_contour T1_Builder_Close_Contour
337 /* First of all, initialize the decoder */
338 decoder->top = decoder->stack;
339 decoder->zone = decoder->zones;
340 zone = decoder->zones;
342 builder->path_begun = 0;
344 zone->base = charstring_base;
345 limit = zone->limit = charstring_base + charstring_len;
346 ip = zone->cursor = zone->base;
348 error = PSaux_Err_Ok;
350 x = builder->pos_x;
351 y = builder->pos_y;
353 /* now, execute loop */
354 while ( ip < limit )
355 {
356 FT_Long* top = decoder->top;
357 T1_Operator op = op_none;
358 FT_Long value = 0;
361 /*********************************************************************/
362 /* */
363 /* Decode operator or operand */
364 /* */
365 /* */
367 /* first of all, decompress operator or value */
368 switch ( *ip++ )
369 {
370 case 1:
371 op = op_hstem;
372 break;
374 case 3:
375 op = op_vstem;
376 break;
377 case 4:
378 op = op_vmoveto;
379 break;
380 case 5:
381 op = op_rlineto;
382 break;
383 case 6:
384 op = op_hlineto;
385 break;
386 case 7:
387 op = op_vlineto;
388 break;
389 case 8:
390 op = op_rrcurveto;
391 break;
392 case 9:
393 op = op_closepath;
394 break;
395 case 10:
396 op = op_callsubr;
397 break;
398 case 11:
399 op = op_return;
400 break;
402 case 13:
403 op = op_hsbw;
404 break;
405 case 14:
406 op = op_endchar;
407 break;
409 case 21:
410 op = op_rmoveto;
411 break;
412 case 22:
413 op = op_hmoveto;
414 break;
416 case 30:
417 op = op_vhcurveto;
418 break;
419 case 31:
420 op = op_hvcurveto;
421 break;
423 case 12:
424 if ( ip > limit )
425 {
426 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
427 "invalid escape (12+EOF)\n" ));
428 goto Syntax_Error;
429 }
431 switch ( *ip++ )
432 {
433 case 0:
434 op = op_dotsection;
435 break;
436 case 1:
437 op = op_vstem3;
438 break;
439 case 2:
440 op = op_hstem3;
441 break;
442 case 6:
443 op = op_seac;
444 break;
445 case 7:
446 op = op_sbw;
447 break;
448 case 12:
449 op = op_div;
450 break;
451 case 16:
452 op = op_callothersubr;
453 break;
454 case 17:
455 op = op_pop;
456 break;
457 case 33:
458 op = op_setcurrentpoint;
459 break;
461 default:
462 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
463 "invalid escape (12+%d)\n",
464 ip[-1] ));
465 goto Syntax_Error;
466 }
467 break;
469 case 255: /* four bytes integer */
470 if ( ip + 4 > limit )
471 {
472 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
473 "unexpected EOF in integer\n" ));
474 goto Syntax_Error;
475 }
477 value = (FT_Int32)( ((FT_Long)ip[0] << 24) |
478 ((FT_Long)ip[1] << 16) |
479 ((FT_Long)ip[2] << 8 ) |
480 ip[3] );
481 ip += 4;
482 break;
484 default:
485 if ( ip[-1] >= 32 )
486 {
487 if ( ip[-1] < 247 )
488 value = (FT_Long)ip[-1] - 139;
489 else
490 {
491 if ( ++ip > limit )
492 {
493 FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
494 FT_ERROR(( "unexpected EOF in integer\n" ));
495 goto Syntax_Error;
496 }
498 if ( ip[-2] < 251 )
499 value = ( ( (FT_Long)ip[-2] - 247 ) << 8 ) + ip[-1] + 108;
500 else
501 value = -( ( ( (FT_Long)ip[-2] - 251 ) << 8 ) + ip[-1] + 108 );
502 }
503 }
504 else
505 {
506 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
507 "invalid byte (%d)\n", ip[-1] ));
508 goto Syntax_Error;
509 }
510 }
512 /*********************************************************************/
513 /* */
514 /* Push value on stack, or process operator */
515 /* */
516 /* */
517 if ( op == op_none )
518 {
519 if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS )
520 {
521 FT_ERROR(( "T1_Decoder_Parse_CharStrings: stack overflow!\n" ));
522 goto Syntax_Error;
523 }
525 FT_TRACE4(( " %ld", value ));
527 *top++ = value;
528 decoder->top = top;
529 }
530 else if ( op == op_callothersubr ) /* callothersubr */
531 {
532 FT_TRACE4(( " callothersubr" ));
534 if ( top - decoder->stack < 2 )
535 goto Stack_Underflow;
537 top -= 2;
538 switch ( top[1] )
539 {
540 case 1: /* start flex feature */
541 if ( top[0] != 0 )
542 goto Unexpected_OtherSubr;
544 decoder->flex_state = 1;
545 decoder->num_flex_vectors = 0;
546 if ( start_point( builder, x, y ) ||
547 check_points( builder, 6 ) )
548 goto Memory_Error;
549 break;
551 case 2: /* add flex vectors */
552 {
553 FT_Int index;
555 if ( top[0] != 0 )
556 goto Unexpected_OtherSubr;
558 /* note that we should not add a point for index 0; */
559 /* this will move our current position to the flex */
560 /* point without adding any point to the outline */
561 index = decoder->num_flex_vectors++;
562 if ( index > 0 && index < 7 )
563 add_point( builder,
564 x,
565 y,
566 (FT_Byte)( index == 3 || index == 6 ) );
567 }
568 break;
570 case 0: /* end flex feature */
571 if ( top[0] != 3 )
572 goto Unexpected_OtherSubr;
574 if ( decoder->flex_state == 0 ||
575 decoder->num_flex_vectors != 7 )
576 {
577 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
578 "unexpected flex end\n" ));
579 goto Syntax_Error;
580 }
582 /* now consume the remaining `pop pop setcurpoint' */
583 if ( ip + 6 > limit ||
584 ip[0] != 12 || ip[1] != 17 || /* pop */
585 ip[2] != 12 || ip[3] != 17 || /* pop */
586 ip[4] != 12 || ip[5] != 33 ) /* setcurpoint */
587 {
588 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
589 "invalid flex charstring\n" ));
590 goto Syntax_Error;
591 }
593 ip += 6;
594 decoder->flex_state = 0;
595 break;
597 case 3: /* change hints */
598 if ( top[0] != 1 )
599 goto Unexpected_OtherSubr;
601 /* eat the following `pop' */
602 if ( ip + 2 > limit )
603 {
604 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
605 "invalid escape (12+%d)\n", ip[-1] ));
606 goto Syntax_Error;
607 }
609 if ( ip[0] != 12 || ip[1] != 17 )
610 {
611 FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
612 FT_ERROR(( "`pop' expected, found (%d %d)\n", ip[0], ip[1] ));
613 goto Syntax_Error;
614 }
615 ip += 2;
616 break;
618 case 12:
619 case 13:
620 /* counter control hints, clear stack */
621 top = decoder->stack;
622 break;
624 case 14:
625 case 15:
626 case 16:
627 case 17:
628 case 18: /* multiple masters */
629 {
630 T1_Blend* blend = decoder->blend;
631 FT_UInt num_points, nn, mm;
632 FT_Long* delta;
633 FT_Long* values;
636 if ( !blend )
637 {
638 FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
639 FT_ERROR(( "unexpected multiple masters operator!\n" ));
640 goto Syntax_Error;
641 }
643 num_points = top[1] - 13 + ( top[1] == 18 );
644 if ( top[0] != (FT_Int)( num_points * blend->num_designs ) )
645 {
646 FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
647 FT_ERROR(( "incorrect number of mm arguments\n" ));
648 goto Syntax_Error;
649 }
651 top -= blend->num_designs*num_points;
652 if ( top < decoder->stack )
653 goto Stack_Underflow;
655 /* we want to compute: */
656 /* */
657 /* a0*w0 + a1*w1 + ... + ak*wk */
658 /* */
659 /* but we only have the a0, a1-a0, a2-a0, .. ak-a0 */
660 /* however, given that w0 + w1 + ... + wk == 1, we can */
661 /* rewrite it easily as: */
662 /* */
663 /* a0 + (a1-a0)*w1 + (a2-a0)*w2 + .. + (ak-a0)*wk */
664 /* */
665 /* where k == num_designs-1 */
666 /* */
667 /* I guess that's why it's written in this `compact' */
668 /* form. */
669 /* */
670 delta = top + num_points;
671 values = top;
672 for ( nn = 0; nn < num_points; nn++ )
673 {
674 FT_Int tmp = values[0];
677 for ( mm = 1; mm < blend->num_designs; mm++ )
678 tmp += FT_MulFix( *delta++, blend->weight_vector[mm] );
680 *values++ = tmp;
681 }
682 /* note that `top' will be incremented later by calls to `pop' */
683 break;
684 }
686 default:
687 Unexpected_OtherSubr:
688 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
689 "invalid othersubr [%d %d]!\n", top[0], top[1] ));
690 goto Syntax_Error;
691 }
692 decoder->top = top;
693 }
694 else /* general operator */
695 {
696 FT_Int num_args = t1_args_count[op];
699 if ( top - decoder->stack < num_args )
700 goto Stack_Underflow;
702 top -= num_args;
704 switch ( op )
705 {
706 case op_endchar:
707 FT_TRACE4(( " endchar" ));
709 close_contour( builder );
711 /* add current outline to the glyph slot */
712 FT_GlyphLoader_Add( builder->loader );
714 /* return now! */
715 FT_TRACE4(( "\n\n" ));
716 return PSaux_Err_Ok;
718 case op_hsbw:
719 FT_TRACE4(( " hsbw" ));
721 builder->left_bearing.x += top[0];
722 builder->advance.x = top[1];
723 builder->advance.y = 0;
725 builder->last.x = x = top[0];
726 builder->last.y = y = 0;
728 /* the `metrics_only' indicates that we only want to compute */
729 /* the glyph's metrics (lsb + advance width), not load the */
730 /* rest of it; so exit immediately */
731 if ( builder->metrics_only )
732 return PSaux_Err_Ok;
734 break;
736 case op_seac:
737 /* return immediately after the processing */
738 return t1operator_seac( decoder, top[0], top[1],
739 top[2], top[3], top[4] );
741 case op_sbw:
742 FT_TRACE4(( " sbw" ));
744 builder->left_bearing.x += top[0];
745 builder->left_bearing.y += top[1];
746 builder->advance.x = top[2];
747 builder->advance.y = top[3];
749 builder->last.x = x = top[0];
750 builder->last.y = y = top[1];
752 /* the `metrics_only' indicates that we only want to compute */
753 /* the glyph's metrics (lsb + advance width), not load the */
754 /* rest of it; so exit immediately */
755 if ( builder->metrics_only )
756 return PSaux_Err_Ok;
758 break;
760 case op_closepath:
761 FT_TRACE4(( " closepath" ));
763 close_contour( builder );
764 builder->path_begun = 0;
765 break;
767 case op_hlineto:
768 FT_TRACE4(( " hlineto" ));
770 if ( start_point( builder, x, y ) )
771 goto Memory_Error;
773 x += top[0];
774 goto Add_Line;
776 case op_hmoveto:
777 FT_TRACE4(( " hmoveto" ));
779 x += top[0];
780 if ( !decoder->flex_state )
781 builder->path_begun = 0;
782 break;
784 case op_hvcurveto:
785 FT_TRACE4(( " hvcurveto" ));
787 if ( start_point( builder, x, y ) ||
788 check_points( builder, 3 ) )
789 goto Memory_Error;
791 x += top[0];
792 add_point( builder, x, y, 0 );
793 x += top[1];
794 y += top[2];
795 add_point( builder, x, y, 0 );
796 y += top[3];
797 add_point( builder, x, y, 1 );
798 break;
800 case op_rlineto:
801 FT_TRACE4(( " rlineto" ));
803 if ( start_point( builder, x, y ) )
804 goto Memory_Error;
806 x += top[0];
807 y += top[1];
809 Add_Line:
810 if ( add_point1( builder, x, y ) )
811 goto Memory_Error;
812 break;
814 case op_rmoveto:
815 FT_TRACE4(( " rmoveto" ));
817 x += top[0];
818 y += top[1];
819 if ( !decoder->flex_state )
820 builder->path_begun = 0;
821 break;
823 case op_rrcurveto:
824 FT_TRACE4(( " rcurveto" ));
826 if ( start_point( builder, x, y ) ||
827 check_points( builder, 3 ) )
828 goto Memory_Error;
830 x += top[0];
831 y += top[1];
832 add_point( builder, x, y, 0 );
834 x += top[2];
835 y += top[3];
836 add_point( builder, x, y, 0 );
838 x += top[4];
839 y += top[5];
840 add_point( builder, x, y, 1 );
841 break;
843 case op_vhcurveto:
844 FT_TRACE4(( " vhcurveto" ));
846 if ( start_point( builder, x, y ) ||
847 check_points( builder, 3 ) )
848 goto Memory_Error;
850 y += top[0];
851 add_point( builder, x, y, 0 );
852 x += top[1];
853 y += top[2];
854 add_point( builder, x, y, 0 );
855 x += top[3];
856 add_point( builder, x, y, 1 );
857 break;
859 case op_vlineto:
860 FT_TRACE4(( " vlineto" ));
862 if ( start_point( builder, x, y ) )
863 goto Memory_Error;
865 y += top[0];
866 goto Add_Line;
868 case op_vmoveto:
869 FT_TRACE4(( " vmoveto" ));
871 y += top[0];
872 if ( !decoder->flex_state )
873 builder->path_begun = 0;
874 break;
876 case op_div:
877 FT_TRACE4(( " div" ));
879 if ( top[1] )
880 {
881 *top = top[0] / top[1];
882 ++top;
883 }
884 else
885 {
886 FT_ERROR(( "T1_Decoder_Parse_CharStrings: division by 0\n" ));
887 goto Syntax_Error;
888 }
889 break;
891 case op_callsubr:
892 {
893 FT_Int index;
896 FT_TRACE4(( " callsubr" ));
898 index = top[0];
899 if ( index < 0 || index >= (FT_Int)decoder->num_subrs )
900 {
901 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
902 "invalid subrs index\n" ));
903 goto Syntax_Error;
904 }
906 if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS )
907 {
908 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
909 "too many nested subrs\n" ));
910 goto Syntax_Error;
911 }
913 zone->cursor = ip; /* save current instruction pointer */
915 zone++;
917 /* The Type 1 driver stores subroutines without the seed bytes. */
918 /* The CID driver stores subroutines with seed bytes. This */
919 /* case is taken care of when decoder->subrs_len == 0. */
920 zone->base = decoder->subrs[index];
922 if ( decoder->subrs_len )
923 zone->limit = zone->base + decoder->subrs_len[index];
924 else
925 {
926 /* We are using subroutines from a CID font. We must adjust */
927 /* for the seed bytes. */
928 zone->base += ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
929 zone->limit = decoder->subrs[index + 1];
930 }
932 zone->cursor = zone->base;
934 if ( !zone->base )
935 {
936 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
937 "invoking empty subrs!\n" ));
938 goto Syntax_Error;
939 }
941 decoder->zone = zone;
942 ip = zone->base;
943 limit = zone->limit;
944 break;
945 }
947 case op_pop:
948 FT_TRACE4(( " pop" ));
950 /* theoretically, the arguments are already on the stack */
951 top++;
952 break;
954 case op_return:
955 FT_TRACE4(( " return" ));
957 if ( zone <= decoder->zones )
958 {
959 FT_ERROR(( "T1_Decoder_Parse_CharStrings: unexpected return\n" ));
960 goto Syntax_Error;
961 }
963 zone--;
964 ip = zone->cursor;
965 limit = zone->limit;
966 decoder->zone = zone;
967 break;
969 case op_dotsection:
970 FT_TRACE4(( " dotsection" ));
972 break;
974 case op_hstem:
975 FT_TRACE4(( " hstem" ));
977 break;
979 case op_hstem3:
980 FT_TRACE4(( " hstem3" ));
982 break;
984 case op_vstem:
985 FT_TRACE4(( " vstem" ));
987 break;
989 case op_vstem3:
990 FT_TRACE4(( " vstem3" ));
992 break;
994 case op_setcurrentpoint:
995 FT_TRACE4(( " setcurrentpoint" ));
997 FT_ERROR(( "T1_Decoder_Parse_CharStrings: " ));
998 FT_ERROR(( "unexpected `setcurrentpoint'\n" ));
999 goto Syntax_Error;
1001 default:
1002 FT_ERROR(( "T1_Decoder_Parse_CharStrings: "
1003 "unhandled opcode %d\n", op ));
1004 goto Syntax_Error;
1005 }
1007 decoder->top = top;
1009 } /* general operator processing */
1011 } /* while ip < limit */
1013 FT_TRACE4(( "..end..\n\n" ));
1014 return error;
1016 Syntax_Error:
1017 return PSaux_Err_Syntax_Error;
1019 Stack_Underflow:
1020 return PSaux_Err_Stack_Underflow;
1022 Memory_Error:
1023 return builder->error;
1024 }
1027 FT_LOCAL_DEF FT_Error
1028 T1_Decoder_Parse_Glyph( T1_Decoder* decoder,
1029 FT_UInt glyph )
1030 {
1031 return decoder->parse_callback( decoder, glyph );
1032 }
1035 FT_LOCAL_DEF FT_Error
1036 T1_Decoder_Init( T1_Decoder* decoder,
1037 FT_Face face,
1038 FT_Size size,
1039 FT_GlyphSlot slot,
1040 FT_Byte** glyph_names,
1041 T1_Blend* blend,
1042 T1_Decoder_Callback parse_callback )
1043 {
1044 MEM_Set( decoder, 0, sizeof ( *decoder ) );
1046 /* retrieve PSNames interface from list of current modules */
1047 {
1048 PSNames_Interface* psnames = 0;
1051 psnames = (PSNames_Interface*)FT_Get_Module_Interface(
1052 FT_FACE_LIBRARY(face), "psnames" );
1053 if ( !psnames )
1054 {
1055 FT_ERROR(( "T1_Decoder_Init: " ));
1056 FT_ERROR(( "the `psnames' module is not available\n" ));
1057 return PSaux_Err_Unimplemented_Feature;
1058 }
1060 decoder->psnames = psnames;
1061 }
1062 T1_Builder_Init( &decoder->builder, face, size, slot );
1064 decoder->num_glyphs = face->num_glyphs;
1065 decoder->glyph_names = glyph_names;
1066 decoder->blend = blend;
1067 decoder->parse_callback = parse_callback;
1069 decoder->funcs = t1_decoder_funcs;
1071 return 0;
1072 }
1075 FT_LOCAL_DEF void
1076 T1_Decoder_Done( T1_Decoder* decoder )
1077 {
1078 T1_Builder_Done( &decoder->builder );
1079 }
1082 /* END */