4 * Copyright (C) 2014 by Werner Lemberg.
6 * This file is part of the ttfautohint library, and may only be used,
7 * modified, and distributed under the terms given in `COPYING'. By
8 * continuing to use, modify, or distribute this file you indicate that you
9 * have read `COPYING' and understand and accept it fully.
11 * The file `COPYING' mentioned in the previous paragraph is distributed
12 * with the ttfautohint library.
21 #include <stdbool.h> /* for llrb.h */
23 #include "llrb.h" /* a red-black tree implementation */
24 #include "tadeltas-bison.h"
27 TA_deltas_new(long font_idx
,
29 number_range
* point_set
,
32 number_range
* ppem_set
)
37 deltas
= (Deltas
*)malloc(sizeof (Deltas
));
41 deltas
->font_idx
= font_idx
;
42 deltas
->glyph_idx
= glyph_idx
;
43 deltas
->points
= number_set_reverse(point_set
);
45 /* we round shift values to multiples of 1/(2^DELTA_SHIFT) */
46 deltas
->x_shift
= (char)(x_shift
* DELTA_FACTOR
47 + (x_shift
> 0 ? 0.5 : -0.5));
48 deltas
->y_shift
= (char)(y_shift
* DELTA_FACTOR
49 + (y_shift
> 0 ? 0.5 : -0.5));
51 deltas
->ppems
= number_set_reverse(ppem_set
);
59 TA_deltas_prepend(Deltas
* list
,
72 TA_deltas_reverse(Deltas
* list
)
96 TA_deltas_free(Deltas
* deltas
)
103 number_set_free(deltas
->points
);
104 number_set_free(deltas
->ppems
);
107 deltas
= deltas
->next
;
114 deltas_show_line(FONT
* font
,
117 char glyph_name_buf
[64];
118 char* points_buf
= NULL
;
119 char* ppems_buf
= NULL
;
133 if (deltas
->font_idx
>= font
->num_sfnts
)
136 face
= font
->sfnts
[deltas
->font_idx
].face
;
137 glyph_name_buf
[0] = '\0';
138 if (FT_HAS_GLYPH_NAMES(face
))
139 FT_Get_Glyph_Name(face
, deltas
->glyph_idx
, glyph_name_buf
, 64);
141 points_buf
= number_set_show(deltas
->points
, -1, -1);
144 ppems_buf
= number_set_show(deltas
->ppems
, -1, -1);
148 /* display glyph index if we don't have a glyph name */
150 s
= sdscatprintf(s
, "%ld %s p %s x %.20g y %.20g @ %s",
154 (double)deltas
->x_shift
/ DELTA_FACTOR
,
155 (double)deltas
->y_shift
/ DELTA_FACTOR
,
158 s
= sdscatprintf(s
, "%ld %ld p %s x %.20g y %.20g @ %s",
162 (double)deltas
->x_shift
/ DELTA_FACTOR
,
163 (double)deltas
->y_shift
/ DELTA_FACTOR
,
175 TA_deltas_show(FONT
* font
)
181 Deltas
* deltas
= font
->deltas
;
193 /* append current line to buffer, followed by a newline character */
194 d
= deltas_show_line(font
, deltas
);
208 deltas
= deltas
->next
;
211 /* we return an empty string if there is no data */
213 res
= (char*)malloc(len
);
223 /* Parse delta exceptions in `font->deltas_buf'. */
226 TA_deltas_parse_buffer(FONT
* font
,
227 char** error_string_p
,
228 unsigned int* errlinenum_p
,
234 Deltas_Context context
;
237 /* nothing to do if no data */
238 if (!font
->deltas_buf
)
244 TA_deltas_scanner_init(&context
, font
);
247 /* this is `yyparse' in disguise */
248 bison_error
= TA_deltas_parse(&context
);
249 TA_deltas_scanner_done(&context
);
253 if (bison_error
== 2)
254 context
.error
= TA_Err_Deltas_Allocation_Error
;
259 if (context
.error
== TA_Err_Deltas_Allocation_Error
260 || context
.error
== TA_Err_Deltas_Flex_Error
)
266 *error_string_p
= strdup(context
.errmsg
);
268 *error_string_p
= strdup(TA_get_error_message(context
.error
));
280 /* construct data for `errline_p' */
281 buf_end
= font
->deltas_buf
+ font
->deltas_len
;
283 p_start
= font
->deltas_buf
;
284 if (context
.errline_num
> 1)
287 while (p_start
< buf_end
)
289 if (*p_start
++ == '\n')
292 if (i
== context
.errline_num
)
299 while (p_end
< buf_end
)
305 *errline_p
= strndup(p_start
, p_end
- p_start
);
307 /* construct data for `error_string_p' */
308 if (context
.error
== TA_Err_Deltas_Invalid_Font_Index
)
309 sprintf(auxbuf
, " (valid range is [%ld;%ld])",
312 else if (context
.error
== TA_Err_Deltas_Invalid_Glyph_Index
)
313 sprintf(auxbuf
, " (valid range is [%ld;%ld])",
315 font
->sfnts
[context
.font_idx
].face
->num_glyphs
);
316 else if (context
.error
== TA_Err_Deltas_Invalid_Shift
)
317 sprintf(auxbuf
, " (valid interval is [%g;%g])",
320 else if (context
.error
== TA_Err_Deltas_Invalid_Range
)
321 sprintf(auxbuf
, " (values must be within [%ld;%ld])",
322 context
.number_set_min
,
323 context
.number_set_max
);
327 ret
= asprintf(error_string_p
, "%s%s",
328 *context
.errmsg
? context
.errmsg
329 : TA_get_error_message(context
.error
),
332 *error_string_p
= NULL
;
335 *errpos_p
= *errline_p
+ context
.errline_pos_left
- 1;
339 *errlinenum_p
= context
.errline_num
;
343 font
->deltas
= context
.result
;
345 return context
.error
;
349 /* node structure for delta exception data */
351 typedef struct Node Node
;
354 LLRB_ENTRY(Node
) entry
;
359 /* comparison function for our red-black tree */
368 /* sort by font index ... */
369 diff
= e1
->delta
.font_idx
- e2
->delta
.font_idx
;
373 /* ... then by glyph index ... */
374 diff
= e1
->delta
.glyph_idx
- e2
->delta
.glyph_idx
;
378 /* ... then by ppem ... */
379 diff
= e1
->delta
.ppem
- e2
->delta
.ppem
;
383 /* ... then by point index */
384 diff
= e1
->delta
.point_idx
- e2
->delta
.point_idx
;
387 /* https://graphics.stanford.edu/~seander/bithacks.html#CopyIntegerSign */
388 return (diff
> 0) - (diff
< 0);
392 /* the red-black tree function body */
393 typedef struct deltas_data deltas_data
;
395 LLRB_HEAD(deltas_data
, Node
);
397 /* no trailing semicolon in the next line */
398 LLRB_GENERATE_STATIC(deltas_data
, Node
, entry
, nodecmp
)
402 TA_deltas_free_tree(FONT
* font
)
404 deltas_data
* deltas_data_head
= (deltas_data
*)font
->deltas_data_head
;
410 if (!deltas_data_head
)
413 for (node
= LLRB_MIN(deltas_data
, deltas_data_head
);
417 next_node
= LLRB_NEXT(deltas_data
, deltas_data_head
, node
);
418 LLRB_REMOVE(deltas_data
, deltas_data_head
, node
);
422 free(deltas_data_head
);
427 TA_deltas_build_tree(FONT
* font
)
429 Deltas
* deltas
= font
->deltas
;
430 deltas_data
* deltas_data_head
;
431 int emit_newline
= 0;
434 /* nothing to do if no data */
437 font
->deltas_data_head
= NULL
;
441 deltas_data_head
= (deltas_data
*)malloc(sizeof (deltas_data
));
442 if (!deltas_data_head
)
443 return FT_Err_Out_Of_Memory
;
445 LLRB_INIT(deltas_data_head
);
449 long font_idx
= deltas
->font_idx
;
450 long glyph_idx
= deltas
->glyph_idx
;
451 char x_shift
= deltas
->x_shift
;
452 char y_shift
= deltas
->y_shift
;
454 number_set_iter ppems_iter
;
458 ppems_iter
.range
= deltas
->ppems
;
459 ppem
= number_set_get_first(&ppems_iter
);
461 while (ppems_iter
.range
)
463 number_set_iter points_iter
;
467 points_iter
.range
= deltas
->points
;
468 point_idx
= number_set_get_first(&points_iter
);
470 while (points_iter
.range
)
476 node
= (Node
*)malloc(sizeof (Node
));
478 return FT_Err_Out_Of_Memory
;
480 node
->delta
.font_idx
= font_idx
;
481 node
->delta
.glyph_idx
= glyph_idx
;
482 node
->delta
.ppem
= ppem
;
483 node
->delta
.point_idx
= point_idx
;
484 node
->delta
.x_shift
= x_shift
;
485 node
->delta
.y_shift
= y_shift
;
487 val
= LLRB_INSERT(deltas_data
, deltas_data_head
, node
);
490 if (val
&& font
->debug
)
492 /* entry is already present; we ignore it */
500 /* construct Deltas entry for debugging output */
504 points
.start
= point_idx
;
505 points
.end
= point_idx
;
508 d
.font_idx
= font_idx
;
509 d
.glyph_idx
= glyph_idx
;
516 s
= deltas_show_line(font
, &d
);
519 fprintf(stderr
, "Delta exception %s ignored.\n", s
);
526 point_idx
= number_set_get_next(&points_iter
);
529 ppem
= number_set_get_next(&ppems_iter
);
532 deltas
= deltas
->next
;
535 if (font
->debug
&& emit_newline
)
536 fprintf(stderr
, "\n");
538 font
->deltas_data_head
= deltas_data_head
;
539 font
->deltas_data_cur
= LLRB_MIN(deltas_data
, deltas_data_head
);
545 /* the next functions are intended to restrict the use of LLRB stuff */
546 /* related to delta exceptions to this file, */
547 /* providing a means to access the data sequentially */
550 TA_deltas_get_next(FONT
* font
)
552 Node
* node
= (Node
*)font
->deltas_data_cur
;
558 node
= LLRB_NEXT(deltas_data
, /* unused */, node
);
560 font
->deltas_data_cur
= node
;
565 TA_deltas_get_delta(FONT
* font
)
567 Node
* node
= (Node
*)font
->deltas_data_cur
;
570 return node
? &node
->delta
: NULL
;
573 /* end of tadeltas.c */