2 * Copyright © 2007,2008,2009,2010 Red Hat, Inc.
3 * Copyright © 2010,2012,2013 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
29 #ifndef HB_OT_LAYOUT_GPOS_TABLE_HH
30 #define HB_OT_LAYOUT_GPOS_TABLE_HH
32 #include "hb-ot-layout-gsubgpos-private.hh"
38 /* buffer **position** var allocations */
39 #define attach_chain() var.i16[0] /* glyph to which this attaches to, relative to current glyphs; negative for going back, positive for forward. */
40 #define attach_type() var.u8[2] /* attachment type */
41 /* Note! if attach_chain() is zero, the value of attach_type() is irrelevant. */
44 ATTACH_TYPE_NONE = 0X00,
46 /* Each attachment should be either a mark or a cursive; can't be both. */
47 ATTACH_TYPE_MARK = 0X01,
48 ATTACH_TYPE_CURSIVE = 0X02,
52 /* Shared Tables: ValueRecord, Anchor Table, and MarkArray */
54 typedef HBUINT16 Value;
56 typedef Value ValueRecord[VAR];
58 struct ValueFormat : HBUINT16
61 xPlacement = 0x0001u, /* Includes horizontal adjustment for placement */
62 yPlacement = 0x0002u, /* Includes vertical adjustment for placement */
63 xAdvance = 0x0004u, /* Includes horizontal adjustment for advance */
64 yAdvance = 0x0008u, /* Includes vertical adjustment for advance */
65 xPlaDevice = 0x0010u, /* Includes horizontal Device table for placement */
66 yPlaDevice = 0x0020u, /* Includes vertical Device table for placement */
67 xAdvDevice = 0x0040u, /* Includes horizontal Device table for advance */
68 yAdvDevice = 0x0080u, /* Includes vertical Device table for advance */
69 ignored = 0x0F00u, /* Was used in TrueType Open for MM fonts */
70 reserved = 0xF000u, /* For future use */
72 devices = 0x00F0u /* Mask for having any Device table */
75 /* All fields are options. Only those available advance the value pointer. */
77 HBINT16 xPlacement; /* Horizontal adjustment for
78 * placement--in design units */
79 HBINT16 yPlacement; /* Vertical adjustment for
80 * placement--in design units */
81 HBINT16 xAdvance; /* Horizontal adjustment for
82 * advance--in design units (only used
83 * for horizontal writing) */
84 HBINT16 yAdvance; /* Vertical adjustment for advance--in
85 * design units (only used for vertical
87 Offset xPlaDevice; /* Offset to Device table for
88 * horizontal placement--measured from
89 * beginning of PosTable (may be NULL) */
90 Offset yPlaDevice; /* Offset to Device table for vertical
91 * placement--measured from beginning
92 * of PosTable (may be NULL) */
93 Offset xAdvDevice; /* Offset to Device table for
94 * horizontal advance--measured from
95 * beginning of PosTable (may be NULL) */
96 Offset yAdvDevice; /* Offset to Device table for vertical
97 * advance--measured from beginning of
98 * PosTable (may be NULL) */
101 inline unsigned int get_len (void) const
102 { return _hb_popcount ((unsigned int) *this); }
103 inline unsigned int get_size (void) const
104 { return get_len () * Value::static_size; }
106 void apply_value (hb_ot_apply_context_t *c,
109 hb_glyph_position_t &glyph_pos) const
111 unsigned int format = *this;
114 hb_font_t *font = c->font;
115 hb_bool_t horizontal = HB_DIRECTION_IS_HORIZONTAL (c->direction);
117 if (format & xPlacement) glyph_pos.x_offset += font->em_scale_x (get_short (values++));
118 if (format & yPlacement) glyph_pos.y_offset += font->em_scale_y (get_short (values++));
119 if (format & xAdvance) {
120 if (likely (horizontal)) glyph_pos.x_advance += font->em_scale_x (get_short (values));
123 /* y_advance values grow downward but font-space grows upward, hence negation */
124 if (format & yAdvance) {
125 if (unlikely (!horizontal)) glyph_pos.y_advance -= font->em_scale_y (get_short (values));
129 if (!has_device ()) return;
131 bool use_x_device = font->x_ppem || font->num_coords;
132 bool use_y_device = font->y_ppem || font->num_coords;
134 if (!use_x_device && !use_y_device) return;
136 const VariationStore &store = c->var_store;
138 /* pixel -> fractional pixel */
139 if (format & xPlaDevice) {
140 if (use_x_device) glyph_pos.x_offset += (base + get_device (values)).get_x_delta (font, store);
143 if (format & yPlaDevice) {
144 if (use_y_device) glyph_pos.y_offset += (base + get_device (values)).get_y_delta (font, store);
147 if (format & xAdvDevice) {
148 if (horizontal && use_x_device) glyph_pos.x_advance += (base + get_device (values)).get_x_delta (font, store);
151 if (format & yAdvDevice) {
152 /* y_advance values grow downward but font-space grows upward, hence negation */
153 if (!horizontal && use_y_device) glyph_pos.y_advance -= (base + get_device (values)).get_y_delta (font, store);
159 inline bool sanitize_value_devices (hb_sanitize_context_t *c, const void *base, const Value *values) const
161 unsigned int format = *this;
163 if (format & xPlacement) values++;
164 if (format & yPlacement) values++;
165 if (format & xAdvance) values++;
166 if (format & yAdvance) values++;
168 if ((format & xPlaDevice) && !get_device (values++).sanitize (c, base)) return false;
169 if ((format & yPlaDevice) && !get_device (values++).sanitize (c, base)) return false;
170 if ((format & xAdvDevice) && !get_device (values++).sanitize (c, base)) return false;
171 if ((format & yAdvDevice) && !get_device (values++).sanitize (c, base)) return false;
176 static inline OffsetTo<Device>& get_device (Value* value)
177 { return *CastP<OffsetTo<Device> > (value); }
178 static inline const OffsetTo<Device>& get_device (const Value* value)
179 { return *CastP<OffsetTo<Device> > (value); }
181 static inline const HBINT16& get_short (const Value* value)
182 { return *CastP<HBINT16> (value); }
186 inline bool has_device (void) const {
187 unsigned int format = *this;
188 return (format & devices) != 0;
191 inline bool sanitize_value (hb_sanitize_context_t *c, const void *base, const Value *values) const
193 TRACE_SANITIZE (this);
194 return_trace (c->check_range (values, get_size ()) && (!has_device () || sanitize_value_devices (c, base, values)));
197 inline bool sanitize_values (hb_sanitize_context_t *c, const void *base, const Value *values, unsigned int count) const
199 TRACE_SANITIZE (this);
200 unsigned int len = get_len ();
202 if (!c->check_array (values, get_size (), count)) return_trace (false);
204 if (!has_device ()) return_trace (true);
206 for (unsigned int i = 0; i < count; i++) {
207 if (!sanitize_value_devices (c, base, values))
208 return_trace (false);
215 /* Just sanitize referenced Device tables. Doesn't check the values themselves. */
216 inline bool sanitize_values_stride_unsafe (hb_sanitize_context_t *c, const void *base, const Value *values, unsigned int count, unsigned int stride) const
218 TRACE_SANITIZE (this);
220 if (!has_device ()) return_trace (true);
222 for (unsigned int i = 0; i < count; i++) {
223 if (!sanitize_value_devices (c, base, values))
224 return_trace (false);
235 inline void get_anchor (hb_ot_apply_context_t *c, hb_codepoint_t glyph_id HB_UNUSED,
236 float *x, float *y) const
238 hb_font_t *font = c->font;
239 *x = font->em_fscale_x (xCoordinate);
240 *y = font->em_fscale_y (yCoordinate);
243 inline bool sanitize (hb_sanitize_context_t *c) const
245 TRACE_SANITIZE (this);
246 return_trace (c->check_struct (this));
250 HBUINT16 format; /* Format identifier--format = 1 */
251 FWORD xCoordinate; /* Horizontal value--in design units */
252 FWORD yCoordinate; /* Vertical value--in design units */
254 DEFINE_SIZE_STATIC (6);
259 inline void get_anchor (hb_ot_apply_context_t *c, hb_codepoint_t glyph_id,
260 float *x, float *y) const
262 hb_font_t *font = c->font;
263 unsigned int x_ppem = font->x_ppem;
264 unsigned int y_ppem = font->y_ppem;
265 hb_position_t cx, cy;
268 ret = (x_ppem || y_ppem) &&
269 font->get_glyph_contour_point_for_origin (glyph_id, anchorPoint, HB_DIRECTION_LTR, &cx, &cy);
270 *x = ret && x_ppem ? cx : font->em_fscale_x (xCoordinate);
271 *y = ret && y_ppem ? cy : font->em_fscale_y (yCoordinate);
274 inline bool sanitize (hb_sanitize_context_t *c) const
276 TRACE_SANITIZE (this);
277 return_trace (c->check_struct (this));
281 HBUINT16 format; /* Format identifier--format = 2 */
282 FWORD xCoordinate; /* Horizontal value--in design units */
283 FWORD yCoordinate; /* Vertical value--in design units */
284 HBUINT16 anchorPoint; /* Index to glyph contour point */
286 DEFINE_SIZE_STATIC (8);
291 inline void get_anchor (hb_ot_apply_context_t *c, hb_codepoint_t glyph_id HB_UNUSED,
292 float *x, float *y) const
294 hb_font_t *font = c->font;
295 *x = font->em_fscale_x (xCoordinate);
296 *y = font->em_fscale_y (yCoordinate);
298 if (font->x_ppem || font->num_coords)
299 *x += (this+xDeviceTable).get_x_delta (font, c->var_store);
300 if (font->y_ppem || font->num_coords)
301 *y += (this+yDeviceTable).get_y_delta (font, c->var_store);
304 inline bool sanitize (hb_sanitize_context_t *c) const
306 TRACE_SANITIZE (this);
307 return_trace (c->check_struct (this) && xDeviceTable.sanitize (c, this) && yDeviceTable.sanitize (c, this));
311 HBUINT16 format; /* Format identifier--format = 3 */
312 FWORD xCoordinate; /* Horizontal value--in design units */
313 FWORD yCoordinate; /* Vertical value--in design units */
315 xDeviceTable; /* Offset to Device table for X
316 * coordinate-- from beginning of
317 * Anchor table (may be NULL) */
319 yDeviceTable; /* Offset to Device table for Y
320 * coordinate-- from beginning of
321 * Anchor table (may be NULL) */
323 DEFINE_SIZE_STATIC (10);
328 inline void get_anchor (hb_ot_apply_context_t *c, hb_codepoint_t glyph_id,
329 float *x, float *y) const
333 case 1: u.format1.get_anchor (c, glyph_id, x, y); return;
334 case 2: u.format2.get_anchor (c, glyph_id, x, y); return;
335 case 3: u.format3.get_anchor (c, glyph_id, x, y); return;
340 inline bool sanitize (hb_sanitize_context_t *c) const
342 TRACE_SANITIZE (this);
343 if (!u.format.sanitize (c)) return_trace (false);
345 case 1: return_trace (u.format1.sanitize (c));
346 case 2: return_trace (u.format2.sanitize (c));
347 case 3: return_trace (u.format3.sanitize (c));
348 default:return_trace (true);
354 HBUINT16 format; /* Format identifier */
355 AnchorFormat1 format1;
356 AnchorFormat2 format2;
357 AnchorFormat3 format3;
360 DEFINE_SIZE_UNION (2, format);
366 inline const Anchor& get_anchor (unsigned int row, unsigned int col, unsigned int cols, bool *found) const {
368 if (unlikely (row >= rows || col >= cols)) return Null(Anchor);
369 *found = !matrixZ[row * cols + col].is_null ();
370 return this+matrixZ[row * cols + col];
373 inline bool sanitize (hb_sanitize_context_t *c, unsigned int cols) const
375 TRACE_SANITIZE (this);
376 if (!c->check_struct (this)) return_trace (false);
377 if (unlikely (_hb_unsigned_int_mul_overflows (rows, cols))) return_trace (false);
378 unsigned int count = rows * cols;
379 if (!c->check_array (matrixZ, matrixZ[0].static_size, count)) return_trace (false);
380 for (unsigned int i = 0; i < count; i++)
381 if (!matrixZ[i].sanitize (c, this)) return_trace (false);
385 HBUINT16 rows; /* Number of rows */
388 matrixZ[VAR]; /* Matrix of offsets to Anchor tables--
389 * from beginning of AnchorMatrix table */
391 DEFINE_SIZE_ARRAY (2, matrixZ);
397 friend struct MarkArray;
399 inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
401 TRACE_SANITIZE (this);
402 return_trace (c->check_struct (this) && markAnchor.sanitize (c, base));
406 HBUINT16 klass; /* Class defined for this mark */
408 markAnchor; /* Offset to Anchor table--from
409 * beginning of MarkArray table */
411 DEFINE_SIZE_STATIC (4);
414 struct MarkArray : ArrayOf<MarkRecord> /* Array of MarkRecords--in Coverage order */
416 inline bool apply (hb_ot_apply_context_t *c,
417 unsigned int mark_index, unsigned int glyph_index,
418 const AnchorMatrix &anchors, unsigned int class_count,
419 unsigned int glyph_pos) const
422 hb_buffer_t *buffer = c->buffer;
423 const MarkRecord &record = ArrayOf<MarkRecord>::operator[](mark_index);
424 unsigned int mark_class = record.klass;
426 const Anchor& mark_anchor = this + record.markAnchor;
428 const Anchor& glyph_anchor = anchors.get_anchor (glyph_index, mark_class, class_count, &found);
429 /* If this subtable doesn't have an anchor for this base and this class,
430 * return false such that the subsequent subtables have a chance at it. */
431 if (unlikely (!found)) return_trace (false);
433 float mark_x, mark_y, base_x, base_y;
435 buffer->unsafe_to_break (glyph_pos, buffer->idx);
436 mark_anchor.get_anchor (c, buffer->cur().codepoint, &mark_x, &mark_y);
437 glyph_anchor.get_anchor (c, buffer->info[glyph_pos].codepoint, &base_x, &base_y);
439 hb_glyph_position_t &o = buffer->cur_pos();
440 o.x_offset = round (base_x - mark_x);
441 o.y_offset = round (base_y - mark_y);
442 o.attach_type() = ATTACH_TYPE_MARK;
443 o.attach_chain() = (int) glyph_pos - (int) buffer->idx;
444 buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
450 inline bool sanitize (hb_sanitize_context_t *c) const
452 TRACE_SANITIZE (this);
453 return_trace (ArrayOf<MarkRecord>::sanitize (c, this));
460 struct SinglePosFormat1
462 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
464 TRACE_COLLECT_GLYPHS (this);
465 if (unlikely (!(this+coverage).add_coverage (c->input))) return;
468 inline const Coverage &get_coverage (void) const
470 return this+coverage;
473 inline bool apply (hb_ot_apply_context_t *c) const
476 hb_buffer_t *buffer = c->buffer;
477 unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
478 if (likely (index == NOT_COVERED)) return_trace (false);
480 valueFormat.apply_value (c, this, values, buffer->cur_pos());
486 inline bool sanitize (hb_sanitize_context_t *c) const
488 TRACE_SANITIZE (this);
489 return_trace (c->check_struct (this) &&
490 coverage.sanitize (c, this) &&
491 valueFormat.sanitize_value (c, this, values));
495 HBUINT16 format; /* Format identifier--format = 1 */
497 coverage; /* Offset to Coverage table--from
498 * beginning of subtable */
499 ValueFormat valueFormat; /* Defines the types of data in the
501 ValueRecord values; /* Defines positioning
502 * value(s)--applied to all glyphs in
503 * the Coverage table */
505 DEFINE_SIZE_ARRAY (6, values);
508 struct SinglePosFormat2
510 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
512 TRACE_COLLECT_GLYPHS (this);
513 if (unlikely (!(this+coverage).add_coverage (c->input))) return;
516 inline const Coverage &get_coverage (void) const
518 return this+coverage;
521 inline bool apply (hb_ot_apply_context_t *c) const
524 hb_buffer_t *buffer = c->buffer;
525 unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
526 if (likely (index == NOT_COVERED)) return_trace (false);
528 if (likely (index >= valueCount)) return_trace (false);
530 valueFormat.apply_value (c, this,
531 &values[index * valueFormat.get_len ()],
538 inline bool sanitize (hb_sanitize_context_t *c) const
540 TRACE_SANITIZE (this);
541 return_trace (c->check_struct (this) &&
542 coverage.sanitize (c, this) &&
543 valueFormat.sanitize_values (c, this, values, valueCount));
547 HBUINT16 format; /* Format identifier--format = 2 */
549 coverage; /* Offset to Coverage table--from
550 * beginning of subtable */
551 ValueFormat valueFormat; /* Defines the types of data in the
553 HBUINT16 valueCount; /* Number of ValueRecords */
554 ValueRecord values; /* Array of ValueRecords--positioning
555 * values applied to glyphs */
557 DEFINE_SIZE_ARRAY (8, values);
562 template <typename context_t>
563 inline typename context_t::return_t dispatch (context_t *c) const
565 TRACE_DISPATCH (this, u.format);
566 if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
568 case 1: return_trace (c->dispatch (u.format1));
569 case 2: return_trace (c->dispatch (u.format2));
570 default:return_trace (c->default_return_value ());
576 HBUINT16 format; /* Format identifier */
577 SinglePosFormat1 format1;
578 SinglePosFormat2 format2;
583 struct PairValueRecord
585 friend struct PairSet;
588 GlyphID secondGlyph; /* GlyphID of second glyph in the
589 * pair--first glyph is listed in the
591 ValueRecord values; /* Positioning data for the first glyph
592 * followed by for second glyph */
594 DEFINE_SIZE_ARRAY (2, values);
599 friend struct PairPosFormat1;
601 inline void collect_glyphs (hb_collect_glyphs_context_t *c,
602 const ValueFormat *valueFormats) const
604 TRACE_COLLECT_GLYPHS (this);
605 unsigned int len1 = valueFormats[0].get_len ();
606 unsigned int len2 = valueFormats[1].get_len ();
607 unsigned int record_size = HBUINT16::static_size * (1 + len1 + len2);
609 const PairValueRecord *record = CastP<PairValueRecord> (arrayZ);
610 c->input->add_array (&record->secondGlyph, len, record_size);
613 inline bool apply (hb_ot_apply_context_t *c,
614 const ValueFormat *valueFormats,
615 unsigned int pos) const
618 hb_buffer_t *buffer = c->buffer;
619 unsigned int len1 = valueFormats[0].get_len ();
620 unsigned int len2 = valueFormats[1].get_len ();
621 unsigned int record_size = HBUINT16::static_size * (1 + len1 + len2);
623 const PairValueRecord *record_array = CastP<PairValueRecord> (arrayZ);
624 unsigned int count = len;
626 /* Hand-coded bsearch. */
627 if (unlikely (!count))
628 return_trace (false);
629 hb_codepoint_t x = buffer->info[pos].codepoint;
630 int min = 0, max = (int) count - 1;
633 int mid = (min + max) / 2;
634 const PairValueRecord *record = &StructAtOffset<PairValueRecord> (record_array, record_size * mid);
635 hb_codepoint_t mid_x = record->secondGlyph;
642 buffer->unsafe_to_break (buffer->idx, pos + 1);
643 valueFormats[0].apply_value (c, this, &record->values[0], buffer->cur_pos());
644 valueFormats[1].apply_value (c, this, &record->values[len1], buffer->pos[pos]);
652 return_trace (false);
655 struct sanitize_closure_t {
657 const ValueFormat *valueFormats;
658 unsigned int len1; /* valueFormats[0].get_len() */
659 unsigned int stride; /* 1 + len1 + len2 */
662 inline bool sanitize (hb_sanitize_context_t *c, const sanitize_closure_t *closure) const
664 TRACE_SANITIZE (this);
665 if (!(c->check_struct (this)
666 && c->check_array (arrayZ, HBUINT16::static_size * closure->stride, len))) return_trace (false);
668 unsigned int count = len;
669 const PairValueRecord *record = CastP<PairValueRecord> (arrayZ);
670 return_trace (closure->valueFormats[0].sanitize_values_stride_unsafe (c, closure->base, &record->values[0], count, closure->stride) &&
671 closure->valueFormats[1].sanitize_values_stride_unsafe (c, closure->base, &record->values[closure->len1], count, closure->stride));
675 HBUINT16 len; /* Number of PairValueRecords */
676 HBUINT16 arrayZ[VAR]; /* Array of PairValueRecords--ordered
677 * by GlyphID of the second glyph */
679 DEFINE_SIZE_ARRAY (2, arrayZ);
682 struct PairPosFormat1
684 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
686 TRACE_COLLECT_GLYPHS (this);
687 if (unlikely (!(this+coverage).add_coverage (c->input))) return;
688 unsigned int count = pairSet.len;
689 for (unsigned int i = 0; i < count; i++)
690 (this+pairSet[i]).collect_glyphs (c, valueFormat);
693 inline const Coverage &get_coverage (void) const
695 return this+coverage;
698 inline bool apply (hb_ot_apply_context_t *c) const
701 hb_buffer_t *buffer = c->buffer;
702 unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
703 if (likely (index == NOT_COVERED)) return_trace (false);
705 hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
706 skippy_iter.reset (buffer->idx, 1);
707 if (!skippy_iter.next ()) return_trace (false);
709 return_trace ((this+pairSet[index]).apply (c, valueFormat, skippy_iter.idx));
712 inline bool sanitize (hb_sanitize_context_t *c) const
714 TRACE_SANITIZE (this);
716 if (!c->check_struct (this)) return_trace (false);
718 unsigned int len1 = valueFormat[0].get_len ();
719 unsigned int len2 = valueFormat[1].get_len ();
720 PairSet::sanitize_closure_t closure = {
727 return_trace (coverage.sanitize (c, this) && pairSet.sanitize (c, this, &closure));
731 HBUINT16 format; /* Format identifier--format = 1 */
733 coverage; /* Offset to Coverage table--from
734 * beginning of subtable */
735 ValueFormat valueFormat[2]; /* [0] Defines the types of data in
736 * ValueRecord1--for the first glyph
737 * in the pair--may be zero (0) */
738 /* [1] Defines the types of data in
739 * ValueRecord2--for the second glyph
740 * in the pair--may be zero (0) */
741 OffsetArrayOf<PairSet>
742 pairSet; /* Array of PairSet tables
743 * ordered by Coverage Index */
745 DEFINE_SIZE_ARRAY (10, pairSet);
748 struct PairPosFormat2
750 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
752 TRACE_COLLECT_GLYPHS (this);
753 if (unlikely (!(this+coverage).add_coverage (c->input))) return;
754 if (unlikely (!(this+classDef2).add_coverage (c->input))) return;
757 inline const Coverage &get_coverage (void) const
759 return this+coverage;
762 inline bool apply (hb_ot_apply_context_t *c) const
765 hb_buffer_t *buffer = c->buffer;
766 unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
767 if (likely (index == NOT_COVERED)) return_trace (false);
769 hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
770 skippy_iter.reset (buffer->idx, 1);
771 if (!skippy_iter.next ()) return_trace (false);
773 unsigned int len1 = valueFormat1.get_len ();
774 unsigned int len2 = valueFormat2.get_len ();
775 unsigned int record_len = len1 + len2;
777 unsigned int klass1 = (this+classDef1).get_class (buffer->cur().codepoint);
778 unsigned int klass2 = (this+classDef2).get_class (buffer->info[skippy_iter.idx].codepoint);
779 if (unlikely (klass1 >= class1Count || klass2 >= class2Count)) return_trace (false);
781 buffer->unsafe_to_break (buffer->idx, skippy_iter.idx + 1);
782 const Value *v = &values[record_len * (klass1 * class2Count + klass2)];
783 valueFormat1.apply_value (c, this, v, buffer->cur_pos());
784 valueFormat2.apply_value (c, this, v + len1, buffer->pos[skippy_iter.idx]);
786 buffer->idx = skippy_iter.idx;
793 inline bool sanitize (hb_sanitize_context_t *c) const
795 TRACE_SANITIZE (this);
796 if (!(c->check_struct (this)
797 && coverage.sanitize (c, this)
798 && classDef1.sanitize (c, this)
799 && classDef2.sanitize (c, this))) return_trace (false);
801 unsigned int len1 = valueFormat1.get_len ();
802 unsigned int len2 = valueFormat2.get_len ();
803 unsigned int stride = len1 + len2;
804 unsigned int record_size = valueFormat1.get_size () + valueFormat2.get_size ();
805 unsigned int count = (unsigned int) class1Count * (unsigned int) class2Count;
806 return_trace (c->check_array (values, record_size, count) &&
807 valueFormat1.sanitize_values_stride_unsafe (c, this, &values[0], count, stride) &&
808 valueFormat2.sanitize_values_stride_unsafe (c, this, &values[len1], count, stride));
812 HBUINT16 format; /* Format identifier--format = 2 */
814 coverage; /* Offset to Coverage table--from
815 * beginning of subtable */
816 ValueFormat valueFormat1; /* ValueRecord definition--for the
817 * first glyph of the pair--may be zero
819 ValueFormat valueFormat2; /* ValueRecord definition--for the
820 * second glyph of the pair--may be
823 classDef1; /* Offset to ClassDef table--from
824 * beginning of PairPos subtable--for
825 * the first glyph of the pair */
827 classDef2; /* Offset to ClassDef table--from
828 * beginning of PairPos subtable--for
829 * the second glyph of the pair */
830 HBUINT16 class1Count; /* Number of classes in ClassDef1
831 * table--includes Class0 */
832 HBUINT16 class2Count; /* Number of classes in ClassDef2
833 * table--includes Class0 */
834 ValueRecord values; /* Matrix of value pairs:
835 * class1-major, class2-minor,
836 * Each entry has value1 and value2 */
838 DEFINE_SIZE_ARRAY (16, values);
843 template <typename context_t>
844 inline typename context_t::return_t dispatch (context_t *c) const
846 TRACE_DISPATCH (this, u.format);
847 if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
849 case 1: return_trace (c->dispatch (u.format1));
850 case 2: return_trace (c->dispatch (u.format2));
851 default:return_trace (c->default_return_value ());
857 HBUINT16 format; /* Format identifier */
858 PairPosFormat1 format1;
859 PairPosFormat2 format2;
864 struct EntryExitRecord
866 friend struct CursivePosFormat1;
868 inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
870 TRACE_SANITIZE (this);
871 return_trace (entryAnchor.sanitize (c, base) && exitAnchor.sanitize (c, base));
876 entryAnchor; /* Offset to EntryAnchor table--from
877 * beginning of CursivePos
878 * subtable--may be NULL */
880 exitAnchor; /* Offset to ExitAnchor table--from
881 * beginning of CursivePos
882 * subtable--may be NULL */
884 DEFINE_SIZE_STATIC (4);
888 reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction, unsigned int new_parent);
890 struct CursivePosFormat1
892 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
894 TRACE_COLLECT_GLYPHS (this);
895 if (unlikely (!(this+coverage).add_coverage (c->input))) return;
898 inline const Coverage &get_coverage (void) const
900 return this+coverage;
903 inline bool apply (hb_ot_apply_context_t *c) const
906 hb_buffer_t *buffer = c->buffer;
908 const EntryExitRecord &this_record = entryExitRecord[(this+coverage).get_coverage (buffer->cur().codepoint)];
909 if (!this_record.exitAnchor) return_trace (false);
911 hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
912 skippy_iter.reset (buffer->idx, 1);
913 if (!skippy_iter.next ()) return_trace (false);
915 const EntryExitRecord &next_record = entryExitRecord[(this+coverage).get_coverage (buffer->info[skippy_iter.idx].codepoint)];
916 if (!next_record.entryAnchor) return_trace (false);
918 unsigned int i = buffer->idx;
919 unsigned int j = skippy_iter.idx;
921 buffer->unsafe_to_break (i, j);
922 float entry_x, entry_y, exit_x, exit_y;
923 (this+this_record.exitAnchor).get_anchor (c, buffer->info[i].codepoint, &exit_x, &exit_y);
924 (this+next_record.entryAnchor).get_anchor (c, buffer->info[j].codepoint, &entry_x, &entry_y);
926 hb_glyph_position_t *pos = buffer->pos;
929 /* Main-direction adjustment */
930 switch (c->direction) {
931 case HB_DIRECTION_LTR:
932 pos[i].x_advance = round (exit_x) + pos[i].x_offset;
934 d = round (entry_x) + pos[j].x_offset;
935 pos[j].x_advance -= d;
936 pos[j].x_offset -= d;
938 case HB_DIRECTION_RTL:
939 d = round (exit_x) + pos[i].x_offset;
940 pos[i].x_advance -= d;
941 pos[i].x_offset -= d;
943 pos[j].x_advance = round (entry_x) + pos[j].x_offset;
945 case HB_DIRECTION_TTB:
946 pos[i].y_advance = round (exit_y) + pos[i].y_offset;
948 d = round (entry_y) + pos[j].y_offset;
949 pos[j].y_advance -= d;
950 pos[j].y_offset -= d;
952 case HB_DIRECTION_BTT:
953 d = round (exit_y) + pos[i].y_offset;
954 pos[i].y_advance -= d;
955 pos[i].y_offset -= d;
957 pos[j].y_advance = round (entry_y);
959 case HB_DIRECTION_INVALID:
964 /* Cross-direction adjustment */
966 /* We attach child to parent (think graph theory and rooted trees whereas
967 * the root stays on baseline and each node aligns itself against its
970 * Optimize things for the case of RightToLeft, as that's most common in
972 unsigned int child = i;
973 unsigned int parent = j;
974 hb_position_t x_offset = entry_x - exit_x;
975 hb_position_t y_offset = entry_y - exit_y;
976 if (!(c->lookup_props & LookupFlag::RightToLeft))
978 unsigned int k = child;
981 x_offset = -x_offset;
982 y_offset = -y_offset;
985 /* If child was already connected to someone else, walk through its old
986 * chain and reverse the link direction, such that the whole tree of its
987 * previous connection now attaches to new parent. Watch out for case
988 * where new parent is on the path from old chain...
990 reverse_cursive_minor_offset (pos, child, c->direction, parent);
992 pos[child].attach_type() = ATTACH_TYPE_CURSIVE;
993 pos[child].attach_chain() = (int) parent - (int) child;
994 buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
995 if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
996 pos[child].y_offset = y_offset;
998 pos[child].x_offset = x_offset;
1001 return_trace (true);
1004 inline bool sanitize (hb_sanitize_context_t *c) const
1006 TRACE_SANITIZE (this);
1007 return_trace (coverage.sanitize (c, this) && entryExitRecord.sanitize (c, this));
1011 HBUINT16 format; /* Format identifier--format = 1 */
1013 coverage; /* Offset to Coverage table--from
1014 * beginning of subtable */
1015 ArrayOf<EntryExitRecord>
1016 entryExitRecord; /* Array of EntryExit records--in
1017 * Coverage Index order */
1019 DEFINE_SIZE_ARRAY (6, entryExitRecord);
1024 template <typename context_t>
1025 inline typename context_t::return_t dispatch (context_t *c) const
1027 TRACE_DISPATCH (this, u.format);
1028 if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
1030 case 1: return_trace (c->dispatch (u.format1));
1031 default:return_trace (c->default_return_value ());
1037 HBUINT16 format; /* Format identifier */
1038 CursivePosFormat1 format1;
1043 typedef AnchorMatrix BaseArray; /* base-major--
1044 * in order of BaseCoverage Index--,
1046 * ordered by class--zero-based. */
1048 struct MarkBasePosFormat1
1050 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
1052 TRACE_COLLECT_GLYPHS (this);
1053 if (unlikely (!(this+markCoverage).add_coverage (c->input))) return;
1054 if (unlikely (!(this+baseCoverage).add_coverage (c->input))) return;
1057 inline const Coverage &get_coverage (void) const
1059 return this+markCoverage;
1062 inline bool apply (hb_ot_apply_context_t *c) const
1065 hb_buffer_t *buffer = c->buffer;
1066 unsigned int mark_index = (this+markCoverage).get_coverage (buffer->cur().codepoint);
1067 if (likely (mark_index == NOT_COVERED)) return_trace (false);
1069 /* Now we search backwards for a non-mark glyph */
1070 hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
1071 skippy_iter.reset (buffer->idx, 1);
1072 skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks);
1074 if (!skippy_iter.prev ()) return_trace (false);
1075 /* We only want to attach to the first of a MultipleSubst sequence.
1076 * https://github.com/harfbuzz/harfbuzz/issues/740
1078 if (!_hb_glyph_info_multiplied (&buffer->info[skippy_iter.idx]) ||
1079 0 == _hb_glyph_info_get_lig_comp (&buffer->info[skippy_iter.idx]) ||
1080 (skippy_iter.idx == 0 ||
1081 _hb_glyph_info_get_lig_id (&buffer->info[skippy_iter.idx]) !=
1082 _hb_glyph_info_get_lig_id (&buffer->info[skippy_iter.idx - 1]) ||
1083 _hb_glyph_info_get_lig_comp (&buffer->info[skippy_iter.idx]) !=
1084 _hb_glyph_info_get_lig_comp (&buffer->info[skippy_iter.idx - 1]) + 1
1087 skippy_iter.reject ();
1090 /* Checking that matched glyph is actually a base glyph by GDEF is too strong; disabled */
1091 //if (!_hb_glyph_info_is_base_glyph (&buffer->info[skippy_iter.idx])) { return_trace (false); }
1093 unsigned int base_index = (this+baseCoverage).get_coverage (buffer->info[skippy_iter.idx].codepoint);
1094 if (base_index == NOT_COVERED) return_trace (false);
1096 return_trace ((this+markArray).apply (c, mark_index, base_index, this+baseArray, classCount, skippy_iter.idx));
1099 inline bool sanitize (hb_sanitize_context_t *c) const
1101 TRACE_SANITIZE (this);
1102 return_trace (c->check_struct (this) &&
1103 markCoverage.sanitize (c, this) &&
1104 baseCoverage.sanitize (c, this) &&
1105 markArray.sanitize (c, this) &&
1106 baseArray.sanitize (c, this, (unsigned int) classCount));
1110 HBUINT16 format; /* Format identifier--format = 1 */
1112 markCoverage; /* Offset to MarkCoverage table--from
1113 * beginning of MarkBasePos subtable */
1115 baseCoverage; /* Offset to BaseCoverage table--from
1116 * beginning of MarkBasePos subtable */
1117 HBUINT16 classCount; /* Number of classes defined for marks */
1119 markArray; /* Offset to MarkArray table--from
1120 * beginning of MarkBasePos subtable */
1122 baseArray; /* Offset to BaseArray table--from
1123 * beginning of MarkBasePos subtable */
1125 DEFINE_SIZE_STATIC (12);
1130 template <typename context_t>
1131 inline typename context_t::return_t dispatch (context_t *c) const
1133 TRACE_DISPATCH (this, u.format);
1134 if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
1136 case 1: return_trace (c->dispatch (u.format1));
1137 default:return_trace (c->default_return_value ());
1143 HBUINT16 format; /* Format identifier */
1144 MarkBasePosFormat1 format1;
1149 typedef AnchorMatrix LigatureAttach; /* component-major--
1150 * in order of writing direction--,
1152 * ordered by class--zero-based. */
1154 typedef OffsetListOf<LigatureAttach> LigatureArray;
1155 /* Array of LigatureAttach
1157 * LigatureCoverage Index */
1159 struct MarkLigPosFormat1
1161 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
1163 TRACE_COLLECT_GLYPHS (this);
1164 if (unlikely (!(this+markCoverage).add_coverage (c->input))) return;
1165 if (unlikely (!(this+ligatureCoverage).add_coverage (c->input))) return;
1168 inline const Coverage &get_coverage (void) const
1170 return this+markCoverage;
1173 inline bool apply (hb_ot_apply_context_t *c) const
1176 hb_buffer_t *buffer = c->buffer;
1177 unsigned int mark_index = (this+markCoverage).get_coverage (buffer->cur().codepoint);
1178 if (likely (mark_index == NOT_COVERED)) return_trace (false);
1180 /* Now we search backwards for a non-mark glyph */
1181 hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
1182 skippy_iter.reset (buffer->idx, 1);
1183 skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks);
1184 if (!skippy_iter.prev ()) return_trace (false);
1186 /* Checking that matched glyph is actually a ligature by GDEF is too strong; disabled */
1187 //if (!_hb_glyph_info_is_ligature (&buffer->info[skippy_iter.idx])) { return_trace (false); }
1189 unsigned int j = skippy_iter.idx;
1190 unsigned int lig_index = (this+ligatureCoverage).get_coverage (buffer->info[j].codepoint);
1191 if (lig_index == NOT_COVERED) return_trace (false);
1193 const LigatureArray& lig_array = this+ligatureArray;
1194 const LigatureAttach& lig_attach = lig_array[lig_index];
1196 /* Find component to attach to */
1197 unsigned int comp_count = lig_attach.rows;
1198 if (unlikely (!comp_count)) return_trace (false);
1200 /* We must now check whether the ligature ID of the current mark glyph
1201 * is identical to the ligature ID of the found ligature. If yes, we
1202 * can directly use the component index. If not, we attach the mark
1203 * glyph to the last component of the ligature. */
1204 unsigned int comp_index;
1205 unsigned int lig_id = _hb_glyph_info_get_lig_id (&buffer->info[j]);
1206 unsigned int mark_id = _hb_glyph_info_get_lig_id (&buffer->cur());
1207 unsigned int mark_comp = _hb_glyph_info_get_lig_comp (&buffer->cur());
1208 if (lig_id && lig_id == mark_id && mark_comp > 0)
1209 comp_index = MIN (comp_count, _hb_glyph_info_get_lig_comp (&buffer->cur())) - 1;
1211 comp_index = comp_count - 1;
1213 return_trace ((this+markArray).apply (c, mark_index, comp_index, lig_attach, classCount, j));
1216 inline bool sanitize (hb_sanitize_context_t *c) const
1218 TRACE_SANITIZE (this);
1219 return_trace (c->check_struct (this) &&
1220 markCoverage.sanitize (c, this) &&
1221 ligatureCoverage.sanitize (c, this) &&
1222 markArray.sanitize (c, this) &&
1223 ligatureArray.sanitize (c, this, (unsigned int) classCount));
1227 HBUINT16 format; /* Format identifier--format = 1 */
1229 markCoverage; /* Offset to Mark Coverage table--from
1230 * beginning of MarkLigPos subtable */
1232 ligatureCoverage; /* Offset to Ligature Coverage
1233 * table--from beginning of MarkLigPos
1235 HBUINT16 classCount; /* Number of defined mark classes */
1237 markArray; /* Offset to MarkArray table--from
1238 * beginning of MarkLigPos subtable */
1239 OffsetTo<LigatureArray>
1240 ligatureArray; /* Offset to LigatureArray table--from
1241 * beginning of MarkLigPos subtable */
1243 DEFINE_SIZE_STATIC (12);
1248 template <typename context_t>
1249 inline typename context_t::return_t dispatch (context_t *c) const
1251 TRACE_DISPATCH (this, u.format);
1252 if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
1254 case 1: return_trace (c->dispatch (u.format1));
1255 default:return_trace (c->default_return_value ());
1261 HBUINT16 format; /* Format identifier */
1262 MarkLigPosFormat1 format1;
1267 typedef AnchorMatrix Mark2Array; /* mark2-major--
1268 * in order of Mark2Coverage Index--,
1270 * ordered by class--zero-based. */
1272 struct MarkMarkPosFormat1
1274 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
1276 TRACE_COLLECT_GLYPHS (this);
1277 if (unlikely (!(this+mark1Coverage).add_coverage (c->input))) return;
1278 if (unlikely (!(this+mark2Coverage).add_coverage (c->input))) return;
1281 inline const Coverage &get_coverage (void) const
1283 return this+mark1Coverage;
1286 inline bool apply (hb_ot_apply_context_t *c) const
1289 hb_buffer_t *buffer = c->buffer;
1290 unsigned int mark1_index = (this+mark1Coverage).get_coverage (buffer->cur().codepoint);
1291 if (likely (mark1_index == NOT_COVERED)) return_trace (false);
1293 /* now we search backwards for a suitable mark glyph until a non-mark glyph */
1294 hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
1295 skippy_iter.reset (buffer->idx, 1);
1296 skippy_iter.set_lookup_props (c->lookup_props & ~LookupFlag::IgnoreFlags);
1297 if (!skippy_iter.prev ()) return_trace (false);
1299 if (!_hb_glyph_info_is_mark (&buffer->info[skippy_iter.idx])) { return_trace (false); }
1301 unsigned int j = skippy_iter.idx;
1303 unsigned int id1 = _hb_glyph_info_get_lig_id (&buffer->cur());
1304 unsigned int id2 = _hb_glyph_info_get_lig_id (&buffer->info[j]);
1305 unsigned int comp1 = _hb_glyph_info_get_lig_comp (&buffer->cur());
1306 unsigned int comp2 = _hb_glyph_info_get_lig_comp (&buffer->info[j]);
1308 if (likely (id1 == id2)) {
1309 if (id1 == 0) /* Marks belonging to the same base. */
1311 else if (comp1 == comp2) /* Marks belonging to the same ligature component. */
1314 /* If ligature ids don't match, it may be the case that one of the marks
1315 * itself is a ligature. In which case match. */
1316 if ((id1 > 0 && !comp1) || (id2 > 0 && !comp2))
1321 return_trace (false);
1324 unsigned int mark2_index = (this+mark2Coverage).get_coverage (buffer->info[j].codepoint);
1325 if (mark2_index == NOT_COVERED) return_trace (false);
1327 return_trace ((this+mark1Array).apply (c, mark1_index, mark2_index, this+mark2Array, classCount, j));
1330 inline bool sanitize (hb_sanitize_context_t *c) const
1332 TRACE_SANITIZE (this);
1333 return_trace (c->check_struct (this) &&
1334 mark1Coverage.sanitize (c, this) &&
1335 mark2Coverage.sanitize (c, this) &&
1336 mark1Array.sanitize (c, this) &&
1337 mark2Array.sanitize (c, this, (unsigned int) classCount));
1341 HBUINT16 format; /* Format identifier--format = 1 */
1343 mark1Coverage; /* Offset to Combining Mark1 Coverage
1344 * table--from beginning of MarkMarkPos
1347 mark2Coverage; /* Offset to Combining Mark2 Coverage
1348 * table--from beginning of MarkMarkPos
1350 HBUINT16 classCount; /* Number of defined mark classes */
1352 mark1Array; /* Offset to Mark1Array table--from
1353 * beginning of MarkMarkPos subtable */
1354 OffsetTo<Mark2Array>
1355 mark2Array; /* Offset to Mark2Array table--from
1356 * beginning of MarkMarkPos subtable */
1358 DEFINE_SIZE_STATIC (12);
1363 template <typename context_t>
1364 inline typename context_t::return_t dispatch (context_t *c) const
1366 TRACE_DISPATCH (this, u.format);
1367 if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
1369 case 1: return_trace (c->dispatch (u.format1));
1370 default:return_trace (c->default_return_value ());
1376 HBUINT16 format; /* Format identifier */
1377 MarkMarkPosFormat1 format1;
1382 struct ContextPos : Context {};
1384 struct ChainContextPos : ChainContext {};
1386 struct ExtensionPos : Extension<ExtensionPos>
1388 typedef struct PosLookupSubTable LookupSubTable;
1398 struct PosLookupSubTable
1400 friend struct PosLookup;
1414 template <typename context_t>
1415 inline typename context_t::return_t dispatch (context_t *c, unsigned int lookup_type) const
1417 TRACE_DISPATCH (this, lookup_type);
1418 if (unlikely (!c->may_dispatch (this, &u.sub_format))) return_trace (c->no_dispatch_return_value ());
1419 switch (lookup_type) {
1420 case Single: return_trace (u.single.dispatch (c));
1421 case Pair: return_trace (u.pair.dispatch (c));
1422 case Cursive: return_trace (u.cursive.dispatch (c));
1423 case MarkBase: return_trace (u.markBase.dispatch (c));
1424 case MarkLig: return_trace (u.markLig.dispatch (c));
1425 case MarkMark: return_trace (u.markMark.dispatch (c));
1426 case Context: return_trace (u.context.dispatch (c));
1427 case ChainContext: return_trace (u.chainContext.dispatch (c));
1428 case Extension: return_trace (u.extension.dispatch (c));
1429 default: return_trace (c->default_return_value ());
1435 HBUINT16 sub_format;
1439 MarkBasePos markBase;
1441 MarkMarkPos markMark;
1443 ChainContextPos chainContext;
1444 ExtensionPos extension;
1447 DEFINE_SIZE_UNION (2, sub_format);
1451 struct PosLookup : Lookup
1453 inline const PosLookupSubTable& get_subtable (unsigned int i) const
1454 { return Lookup::get_subtable<PosLookupSubTable> (i); }
1456 inline bool is_reverse (void) const
1461 inline bool apply (hb_ot_apply_context_t *c) const
1464 return_trace (dispatch (c));
1467 inline hb_collect_glyphs_context_t::return_t collect_glyphs (hb_collect_glyphs_context_t *c) const
1469 TRACE_COLLECT_GLYPHS (this);
1470 return_trace (dispatch (c));
1473 template <typename set_t>
1474 inline void add_coverage (set_t *glyphs) const
1476 hb_add_coverage_context_t<set_t> c (glyphs);
1480 static bool apply_recurse_func (hb_ot_apply_context_t *c, unsigned int lookup_index);
1482 template <typename context_t>
1483 static inline typename context_t::return_t dispatch_recurse_func (context_t *c, unsigned int lookup_index);
1485 template <typename context_t>
1486 inline typename context_t::return_t dispatch (context_t *c) const
1487 { return Lookup::dispatch<PosLookupSubTable> (c); }
1489 inline bool sanitize (hb_sanitize_context_t *c) const
1491 TRACE_SANITIZE (this);
1492 if (unlikely (!Lookup::sanitize (c))) return_trace (false);
1493 return_trace (dispatch (c));
1497 typedef OffsetListOf<PosLookup> PosLookupList;
1500 * GPOS -- The Glyph Positioning Table
1503 struct GPOS : GSUBGPOS
1505 static const hb_tag_t tableTag = HB_OT_TAG_GPOS;
1507 inline const PosLookup& get_lookup (unsigned int i) const
1508 { return CastR<PosLookup> (GSUBGPOS::get_lookup (i)); }
1510 static inline void position_start (hb_font_t *font, hb_buffer_t *buffer);
1511 static inline void position_finish_advances (hb_font_t *font, hb_buffer_t *buffer);
1512 static inline void position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer);
1514 inline bool sanitize (hb_sanitize_context_t *c) const
1516 TRACE_SANITIZE (this);
1517 if (unlikely (!GSUBGPOS::sanitize (c))) return_trace (false);
1518 const OffsetTo<PosLookupList> &list = CastR<OffsetTo<PosLookupList> > (lookupList);
1519 return_trace (list.sanitize (c, this));
1525 reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction, unsigned int new_parent)
1527 int chain = pos[i].attach_chain(), type = pos[i].attach_type();
1528 if (likely (!chain || 0 == (type & ATTACH_TYPE_CURSIVE)))
1531 pos[i].attach_chain() = 0;
1533 unsigned int j = (int) i + chain;
1535 /* Stop if we see new parent in the chain. */
1536 if (j == new_parent)
1539 reverse_cursive_minor_offset (pos, j, direction, new_parent);
1541 if (HB_DIRECTION_IS_HORIZONTAL (direction))
1542 pos[j].y_offset = -pos[i].y_offset;
1544 pos[j].x_offset = -pos[i].x_offset;
1546 pos[j].attach_chain() = -chain;
1547 pos[j].attach_type() = type;
1550 propagate_attachment_offsets (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
1552 /* Adjusts offsets of attached glyphs (both cursive and mark) to accumulate
1553 * offset of glyph they are attached to. */
1554 int chain = pos[i].attach_chain(), type = pos[i].attach_type();
1555 if (likely (!chain))
1558 unsigned int j = (int) i + chain;
1560 pos[i].attach_chain() = 0;
1562 propagate_attachment_offsets (pos, j, direction);
1564 assert (!!(type & ATTACH_TYPE_MARK) ^ !!(type & ATTACH_TYPE_CURSIVE));
1566 if (type & ATTACH_TYPE_CURSIVE)
1568 if (HB_DIRECTION_IS_HORIZONTAL (direction))
1569 pos[i].y_offset += pos[j].y_offset;
1571 pos[i].x_offset += pos[j].x_offset;
1573 else /*if (type & ATTACH_TYPE_MARK)*/
1575 pos[i].x_offset += pos[j].x_offset;
1576 pos[i].y_offset += pos[j].y_offset;
1579 if (HB_DIRECTION_IS_FORWARD (direction))
1580 for (unsigned int k = j; k < i; k++) {
1581 pos[i].x_offset -= pos[k].x_advance;
1582 pos[i].y_offset -= pos[k].y_advance;
1585 for (unsigned int k = j + 1; k < i + 1; k++) {
1586 pos[i].x_offset += pos[k].x_advance;
1587 pos[i].y_offset += pos[k].y_advance;
1593 GPOS::position_start (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
1595 unsigned int count = buffer->len;
1596 for (unsigned int i = 0; i < count; i++)
1597 buffer->pos[i].attach_chain() = buffer->pos[i].attach_type() = 0;
1601 GPOS::position_finish_advances (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
1603 //_hb_buffer_assert_gsubgpos_vars (buffer);
1607 GPOS::position_finish_offsets (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
1609 _hb_buffer_assert_gsubgpos_vars (buffer);
1612 hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, &len);
1613 hb_direction_t direction = buffer->props.direction;
1615 /* Handle attachments */
1616 if (buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT)
1617 for (unsigned int i = 0; i < len; i++)
1618 propagate_attachment_offsets (pos, i, direction);
1622 /* Out-of-class implementation for methods recursing */
1624 template <typename context_t>
1625 /*static*/ inline typename context_t::return_t PosLookup::dispatch_recurse_func (context_t *c, unsigned int lookup_index)
1627 const GPOS &gpos = *(hb_ot_layout_from_face (c->face)->gpos);
1628 const PosLookup &l = gpos.get_lookup (lookup_index);
1629 return l.dispatch (c);
1632 /*static*/ inline bool PosLookup::apply_recurse_func (hb_ot_apply_context_t *c, unsigned int lookup_index)
1634 const GPOS &gpos = *(hb_ot_layout_from_face (c->face)->gpos);
1635 const PosLookup &l = gpos.get_lookup (lookup_index);
1636 unsigned int saved_lookup_props = c->lookup_props;
1637 unsigned int saved_lookup_index = c->lookup_index;
1638 c->set_lookup_index (lookup_index);
1639 c->set_lookup_props (l.get_props ());
1640 bool ret = l.dispatch (c);
1641 c->set_lookup_index (saved_lookup_index);
1642 c->set_lookup_props (saved_lookup_props);
1651 } /* namespace OT */
1654 #endif /* HB_OT_LAYOUT_GPOS_TABLE_HH */